Initial driver for Synaptics touchscreens using RMI4 protocol.
Signed-off-by: William Manson <WManson@xxxxxxxxxxxxx>
Signed-off-by: Allie Xiong <axiong@xxxxxxxxxxxxx>
Signed-off-by: Christopher Heiny <cheiny@xxxxxxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 13 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/rmi.h | 206 ++++++++
drivers/input/touchscreen/rmi_app_touchpad.c | 400 +++++++++++++++
drivers/input/touchscreen/rmi_core.c | 708 ++++++++++++++++++++++++++
drivers/input/touchscreen/rmi_core.h | 58 +++
drivers/input/touchscreen/rmi_function_11.c | 438 ++++++++++++++++
drivers/input/touchscreen/rmi_function_11.h | 43 ++
drivers/input/touchscreen/rmi_functions.h | 111 ++++
drivers/input/touchscreen/rmi_i2c.h | 51 ++
drivers/input/touchscreen/rmi_i2c_gta01.c | 117 +++++
drivers/input/touchscreen/rmi_phys_i2c.c | 578 +++++++++++++++++++++
12 files changed, 2724 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 8a8fa4d..ebd3abf 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -307,6 +307,19 @@ config TOUCHSCREEN_MIGOR
To compile this driver as a module, choose M here: the
module will be called migor_ts.
+config TOUCHSCREEN_SYNAPTICS_RMI4_I2C
+ tristate "Synaptics RMI4 I2C touchscreens"
+ depends on I2C
+ help
+ Say Y here if you have a Synaptics RMI4 I2C touchscreen connected to
+ your system. This enables support for Synaptics RMI4 over I2C based
+ touchscreens.
+
+ If unsure, say N.
+
+ To compile this driver as a set of modules, choose M here: the
+ modules will be called rmi, rmi_app_touchpad, rmi_phys_i2c.
+
config TOUCHSCREEN_TOUCHRIGHT
tristate "Touchright serial touchscreen"
select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 7fef7d5..d76bca4 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o
obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_RMI4_I2C) += rmi_core.o rmi_app_touchpad.o rmi_function_11.o rmi_phys_i2c.o rmi_i2c_gta01.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
diff --git a/drivers/input/touchscreen/rmi.h b/drivers/input/touchscreen/rmi.h
new file mode 100755
index 0000000..7cec9b8
--- /dev/null
+++ b/drivers/input/touchscreen/rmi.h
@@ -0,0 +1,206 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Header File.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#ifndef _RMI_H
+#define _RMI_H
+
+/* RMI4 Protocol Support
+ */
+
+/* For each function present on the RMI device, we need to get the RMI4 Function
+ * Descriptor info from the Page Descriptor Table. This will give us the
+ * addresses for Query, Command, Control, Data and the Source Count (number
+ * of sources for this function) and the function id.
+ */
+struct rmi_function_descriptor {
+ unsigned char queryBaseAddr;
+ unsigned char commandBaseAddr;
+ unsigned char controlBaseAddr;
+ unsigned char dataBaseAddr;
+ unsigned char interruptSrcCnt;
+ unsigned char functionNum;
+};
+
+/* For each function present on the RMI device, there will be a corresponding
+ * entry in the functions list of the rmi_module_info structure. This entry
+ * gives information about the number of data sources and the number of data
+ * registers associated with the function.
+ */
+struct rmi_function_info {
+ unsigned char functionNum;
+
+ /* This is the number of data sources associated with the function.*/
+ unsigned char numSources;
+
+ /* This is the number of data points supported - for example, for
+ * function $11 (2D sensor) the number of data points is equal to the
+ * number of fingers - for function $19 (buttons)it is the number of
+ * buttons.
+ */
+ unsigned char numDataPoints;
+
+ /* This is the number of data registers to read.*/
+ unsigned char dataRegBlockSize;
+
+ /* This is the interrupt register and mask - needed for enabling the
+ * interrupts and for checking what source had caused the attention line
+ * interrupt.
+ */
+ unsigned char interruptRegister;
+ unsigned char interruptMask;
+
+ /* This is the RMI function descriptor associated with this function.
+ * It contains the Base addresses for the functions query, command,
+ * control, and data registers.
+ */
+ struct rmi_function_descriptor funcDescriptor;
+
+ /* A list of the function information.
+ * This list uses the standard kernel linked list implementation.
+ * Documentation on on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head link;
+};
+
+/* This encapsulates the information found using the RMI4 Function $01
+ * query registers. There is only one Function $01 per device.
+ *
+ * Assuming appropriate endian-ness, you can populate most of this
+ * structure by reading query registers starting at the query base address
+ * that was obtained from RMI4 function 0x01 function descriptor info read
+ * from the Page Descriptor Table.
+ *
+ * Specific register information is provided in the comments for each field.
+ * For further reference, please see the "Synaptics RMI 4 Interfacing
+ * Guide" document : go to http://www.synaptics.com/developers/manuals - and
+ * select "Synaptics RMI 4 Interfacting Guide".
+ */
+struct rmi_module_info {
+ /* The Protocol Major Version number.*/
+ unsigned rmi_maj_ver;
+
+ /* The Protocol Minor Version number.*/
+ unsigned rmi_min_ver;
+
+ /* The manufacturer identification byte.*/
+ unsigned char mfgid;
+
+ /* The Product Properties information.*/
+ unsigned char properties;
+
+ /* The product info bytes.*/
+ unsigned char prod_info[2];
+
+ /* Date Code - Year, Month, Day.*/
+ unsigned char date_code[3];
+
+ /* Tester ID (14 bits).*/
+ unsigned short tester_id;
+
+ /* Serial Number (14 bits).*/
+ unsigned short serial_num;
+
+ /* A null-terminated string that identifies this particular product.*/
+ char prod_id[10];
+
+ /* A list of the function presence queries.
+ * This list uses the standard kernel linked list implementation.
+ * Documentation on on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head functions;
+};
+
+struct rmi_phys_driver {
+ char *name;
+ int (*write)(struct rmi_phys_driver *pd, unsigned short address,
+ char data);
+ int (*read)(struct rmi_phys_driver *pd, unsigned short address,
+ char *buffer);
+ int (*write_multiple)(struct rmi_phys_driver *pd,
+ unsigned short address, char *buffer, int length);
+ int (*read_multiple)(struct rmi_phys_driver *pd, unsigned short address,
+ char *buffer, int length);
+ void (*attention)(struct rmi_phys_driver *pd, int instance);
+ bool polling_required;
+ int irq;
+
+ /* Standard kernel linked list implementation.
+ * Documentation on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head drivers;
+ struct rmi_application *app;
+ struct rmi_module_info rmi;
+ struct module *module;
+};
+
+int rmi_read(struct rmi_application *app, unsigned short address, char *dest);
+int rmi_write(struct rmi_application *app, unsigned short address,
+ unsigned char data);
+int rmi_read_multiple(struct rmi_application *app, unsigned short address,
+ char *dest, int length);
+int rmi_write_multiple(struct rmi_application *app, unsigned short address,
+ unsigned char *data, int length);
+int rmi_register_phys_driver(struct rmi_phys_driver *rpd);
+int rmi_unregister_phys_driver(struct rmi_phys_driver *rpd);
+
+struct rmi_application *rmi_register_application(const char *name,
+ void (*attention)(struct rmi_phys_driver *pd, int instance),
+ int (*probe)(struct rmi_application *app,
+ const struct rmi_module_info *rmi),
+ void (*config)(struct rmi_application *app));
+
+void rmi_unregister_application(struct rmi_application *app);
+bool rmi_polling_required(struct rmi_application *app);
+
+/* Set this to 1 to turn on code used in detecting buffer leaks. */
+#define RMI_ALLOC_STATS 1
+
+#if RMI_ALLOC_STATS
+extern int appallocsrmi;
+extern int rfiallocsrmi;
+extern int fnallocsrmi;
+
+#define INC_ALLOC_STAT(X) (X##allocsrmi++)
+#define DEC_ALLOC_STAT(X) \
+ do { \
+ if (X##allocsrmi) X##allocsrmi--; \
+ else printk(KERN_DEBUG "Too many " #X " frees\n"); \
+ } while (0)
+#define CHECK_ALLOC_STAT(X) \
+ do { \
+ if (X##allocsrmi) \
+ printk(KERN_DEBUG "Left over " #X " buffers: %d\n", \
+ X##allocsrmi); \
+ } while (0)
+#else
+#define INC_ALLOC_STAT(X) do { } while (0)
+#define DEC_ALLOC_STAT(X) do { } while (0)
+#define CHECK_ALLOC_STAT(X) do { } while (0)
+#endif
+
+#endif
diff --git a/drivers/input/touchscreen/rmi_app_touchpad.c b/drivers/input/touchscreen/rmi_app_touchpad.c
new file mode 100755
index 0000000..5f3bd81
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_app_touchpad.c
@@ -0,0 +1,400 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) TouchPad Application Layer Driver.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ *
+ * This code implements a polling mechanism using a timer as well as
+ * interrupt-driven sampling.
+ *
+ * Note that it is the lower-level drivers that determine whether this driver
+ * has to do polling or interrupt-driven. Polling can always be done, but if
+ * we have an interrupt connected to the attention (ATTN) line, then it is
+ * better to be interrupt driven.
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/hrtimer.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+
+#include "rmi.h"
+#include "rmi_core.h"
+#include "rmi_functions.h"
+
+#define RMI_REPORT_RATE_80 0
+#define RMI_REPORT_RATE_40 (1 << 6)
+
+static long polltime = 25000000;
+module_param(polltime, long, 0644);
+MODULE_PARM_DESC(polltime, "How long to wait between polls (in nano seconds).");
+
+static struct rmi_application *app;
+
+/* TODO: We should move this to the application data struct and allow more than
+ one input device per system. We'll address in a follow up patch. */
+static struct input_dev *input;
+
+/* RMI4 device control == function 0x01 */
+extern unsigned short fn01ControlBaseAddr;
+/* number of total interrupt registers to read */
+extern unsigned int interruptRegisterCount;
+
+
+/**
+ * This is the function we pass to the RMI4 subsystem so we can be notified
+ * when attention is required. It may be called in interrupt context.
+ */
+static void attention(struct rmi_phys_driver *rpd, int instance)
+{
+ /* All we have to do is schedule work. */
+ schedule_work(&(rpd->app->work));
+}
+
+/**
+ * This is the meat of the driver. It reads in all data sources and reports
+ * them to the input subsystem. It is used for both polling and interrupt
+ * driven operation.
+ */
+int report_sensor_data(struct rmi_application *app)
+{
+ unsigned char interruptStatus[4] = {0, 0, 0, 0};
+ int touch; /* number of touch points - fingers or buttons */
+ struct rmi_functions *fn;
+ struct rmi_function_info *rfi;
+ struct rmi_phys_driver *rpd;
+ struct rmi_module_info *rmi;
+ static int num_error_reports;
+
+ touch = 0;
+
+ /* Get the interrupt status from the function $01 control register+1 to
+ find which source(s) were interrupting so we can read the data from the
+ source(s) (2D sensor, buttons, etc.).
+ */
+ if (rmi_read_multiple(app, fn01ControlBaseAddr + 1,
+ interruptStatus, interruptRegisterCount)) {
+ printk(KERN_ERR "%s: Could not read interrupt status registers 0x%x\n",
+ __func__, fn01ControlBaseAddr + 1);
+ return 0;
+ }
+
+ /* check each function that has data sources and if the interrupt for
+ * that triggered then call that RMI4 functions report() function to
+ * gather data and report it to the input subsystem */
+ rpd = app->rpd; /* get ptr to rmi_physical_driver from app */
+ rmi = &(rpd->rmi); /* get ptr to rmi_module_info from physical driver */
+
+ list_for_each_entry(rfi, &rmi->functions, link) {
+ if (rfi->numSources) {
+ if (interruptStatus[rfi->interruptRegister] &
+ rfi->interruptMask) {
+ bool found;
+ found = false;
+ fn = rmi_find_function(rfi->functionNum);
+ if (fn) {
+ found = true;
+ if (fn->report) {
+ touch = fn->report(app,
+ rfi, fn->input);
+ } else {
+ num_error_reports++;
+ if (num_error_reports < 6) {
+ /* the developer did not add in the
+ pointer to the report function into
+ rmi4_supported_data_src_functions */
+ printk(KERN_ERR "%s: no find report function for function 0x%x\n", __func__, fn->functionNum);
+ }
+ }
+ }
+
+ if (!found) {
+ num_error_reports++;
+ if (num_error_reports < 6) {
+ /* if no support found for this
+ RMI4 function it means the
+ developer did not add the
+ appropriate function pointer
+ list into the rmi4_supported_data_src_functions
+ array and/or did not bump up
+ the number of supported RMI4
+ functions in rmi.h as required.
+ */
+ printk(KERN_ERR "%s: could not find any support for function 0x%x\n", __func__, fn->functionNum);
+ }
+ }
+ }
+ }
+ }
+
+ /* return the number of touch points - fingers down and/or buttons
+ * pressed, etc. */
+ return touch;
+}
+
+/* This is the worker function - it simply has to call report_sensor_data. */
+static void ts_work_func(struct work_struct *work)
+{
+ struct rmi_application *app = container_of(work,
+ struct rmi_application, work);
+
+ report_sensor_data(app);
+
+ /* we only need to enable the irq if doing interrupts */
+ if (!rmi_polling_required(app))
+ enable_irq(app->rpd->irq);
+}
+
+/* This is the timer function for polling - it simply has to schedule work
+ * and restart the timer. */
+static enum hrtimer_restart ts_poll_timer_func(struct hrtimer *timer)
+{
+ struct rmi_application *app = container_of(timer,
+ struct rmi_application, timer);
+
+ schedule_work(&app->work);
+ hrtimer_start(&app->timer, ktime_set(0, polltime), HRTIMER_MODE_REL);
+ return HRTIMER_NORESTART;
+}
+
+/**
+ * This is the probe function passed to the RMI4 subsystem that gives us a
+ * chance to recognize an RMI4 device. In this case, we're looking for
+ * Synaptics devices that have data sources - such as touch screens, buttons,
+ * etc.
+ */
+static int probe(struct rmi_application *app,
+ const struct rmi_module_info *rmi)
+{
+ struct rmi_function_info *rfi;
+ int data_sources = 0;
+ int retval = 0;
+
+ if (!rmi) {
+ printk(KERN_ERR "%s: Invalid module info: %p\n", __func__, rmi);
+ return 0;
+ }
+
+ /* Check if this is a Synaptics device - report if not. */
+ if (rmi->mfgid != 1) { /* Synaptics? */
+ printk(KERN_INFO "%s: non-Synaptics mfg id: %d\n",
+ __func__, rmi->mfgid);
+ }
+
+ /* for each function entry in the list accumulate it's number of data
+ sources */
+ list_for_each_entry(rfi, &rmi->functions, link) {
+ data_sources += rfi->numSources;
+ }
+
+ if (data_sources) {
+ retval = 1;
+ /* We have detected one or more data sources such as
+ 2D Sensors, buttons, etc. */
+ printk(KERN_INFO "%s: Found %d data sources for : %p\n",
+ __func__, data_sources, rmi);
+ } else {
+ /* we don't have any data sources for this sensor - oops!
+ - either an un-flashed sensor or bad!! */
+ printk(KERN_INFO "%s: No data sources found for : %p\n",
+ __func__, rmi);
+ }
+
+ return retval;
+}
+
+static void config(struct rmi_application *app)
+{
+ /* For each data source we had detected print info and set up interrupts
+ or polling. */
+ struct rmi_function_info *rfi;
+ struct rmi_phys_driver *rpd;
+ struct rmi_module_info *rmi;
+
+ rpd = app->rpd; /* get ptr to rmi_physical_driver from app */
+ rmi = &(rpd->rmi); /* get ptr to rmi_module_info from physical driver */
+
+ list_for_each_entry(rfi, &rmi->functions, link) {
+ if (rfi->numSources) {
+ /* This function has data sources associated with it.*/
+ /* Get and print some info about the data sources... */
+ struct rmi_functions *fn;
+ bool found = false;
+ /* check if function number matches - if so call that
+ config function */
+ fn = rmi_find_function(rfi->functionNum);
+ if (fn) {
+ found = true;
+ if (fn->config) {
+ fn->config(app, rfi);
+ } else {
+ /* the developer did not add in the
+ pointer to the config function into
+ rmi4_supported_data_src_functions */
+ printk(KERN_ERR
+ "%s: no config function for "
+ "function 0x%x\n",
+ __func__, rfi->functionNum);
+ break;
+ }
+ }
+
+ if (!found) {
+ /* if no support found for this RMI4 function
+ it means the developer did not add the
+ appropriate function pointer list into the
+ rmi4_supported_data_src_functions array and/or
+ did not bump up the number of supported RMI4
+ functions in rmi.h as required */
+ printk(KERN_ERR"%s: could not find support "
+ "for function 0x%x\n",
+ __func__, rfi->functionNum);
+ }
+
+ /* if we are not doing polling then enable the
+ interrupts for the data sources for this function */
+ if (!rmi_polling_required(app)) {
+ /* Turn on interrupts for this
+ function's data sources. */
+ rmi_write(app, fn01ControlBaseAddr + 1 +
+ rfi->interruptRegister,
+ rfi->interruptMask);
+ printk(KERN_INFO
+ "%s: Interrupt Driven - turning on "
+ "interrupts for function 0x%x\n",
+ __func__, rfi->functionNum);
+ }
+ }
+ }
+
+ /* if we are not polling we need to set up the interrupt worker
+ thread - otherwise we need to set up the polling callback and
+ worker thread. */
+ if (!rmi_polling_required(app)) {
+ /* We're interrupt driven, so set up packet rate and the worker
+ thread function. */
+ if (HZ < 500) {
+ /* The default packet rate of 80 packets per
+ * second is too fast (the Linux time slice for
+ * sub-GHz processors is only 100 times per second).
+ * So re-program it to 40 packets per second.
+ */
+ rmi_write(app, fn01ControlBaseAddr, RMI_REPORT_RATE_40);
+ }
+
+ INIT_WORK(&app->work, ts_work_func);
+
+ } else {
+ /* We're polling driven, so set up the polling timer
+ and timer function. */
+ INIT_WORK(&app->work, ts_work_func);
+ hrtimer_init(&app->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ app->timer.function = ts_poll_timer_func;
+ hrtimer_start(&app->timer, ktime_set(1, 0), HRTIMER_MODE_REL);
+ }
+}
+
+/**
+ * The module initialization function in which we register as a RMI4
+ * application driver. We also register with the input subsystem so we can
+ * pass coordinates to it.
+ */
+static int __init rmi_app_touchpad_init(void)
+{
+ int retval;
+
+ retval = 0;
+
+ pr_debug("%s: RMI4 TouchPad Driver\n", __func__);
+
+ /* NOTE: we are creating only one input dev file for this but
+ theoretically you could create a separate one for each data
+ source and store it below. This will let you put 2D sensor
+ events into one dev file, button events into a separate dev file,
+ other data source event like GPIOs, etc. into yet a third dev file.
+ As this is being coded it will dump all events into the one dev file.
+ */
+ input = input_allocate_device();
+ if (input == NULL) {
+ printk(KERN_ERR "%s: Failed to allocate memory for a "
+ "new input device.\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ input->name = "RMI4 Touchpad";
+ input->phys = "rmi_app_touchpad";
+
+ /* Set input device specific params for each data source...*/
+ retval = rmi_functions_init(input);
+
+ if (retval) {
+ printk(KERN_ERR "%s: Failed rmi_functions_init.\n", __func__);
+ return retval;
+ }
+
+ retval = input_register_device(input);
+
+ if (retval) {
+ printk(KERN_ERR "%s: Failed input_register_device.\n",
+ __func__);
+ return retval;
+ }
+
+ app = rmi_register_application("rmi4_touchpad",
+ attention, probe, config);
+
+ if (!app) {
+ printk(KERN_ERR "%s: Failed to register app.\n", __func__);
+ input_unregister_device(input);
+ retval = -ENODEV;
+ }
+
+ return retval;
+}
+
+static void __exit rmi_app_touchpad_exit(void)
+{
+ pr_debug("%s: RMI4 TouchPad Driver\n", __func__);
+
+ /* Stop the polling timer if doing polling */
+ if (rmi_polling_required(app))
+ hrtimer_cancel(&app->timer);
+
+ flush_scheduled_work(); /* Make sure all scheduled work is stopped */
+
+ /* Unregister everything */
+ printk(KERN_WARNING "%s: Unregistering app - %s\n",
+ __func__, app->name);
+ rmi_unregister_application(app);
+ input_unregister_device(input);
+}
+
+module_init(rmi_app_touchpad_init);
+module_exit(rmi_app_touchpad_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("RMI4 Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/rmi_core.c b/drivers/input/touchscreen/rmi_core.c
new file mode 100755
index 0000000..893619a
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_core.c
@@ -0,0 +1,708 @@
+/**
+ * Synaptics Register Mapped Interface (RMI4) Data Layer Driver.
+ * Copyright (C) 2007 - 2010, Synaptics Incorporated
+ *
+ *
+ * This protocol is layered as follows.
+ *
+ *
+ * +----------------------------------------+
+ * | |
+ * | Application |
+ * | |
+ * +----------------------------------------+
+ * | |
+ * | RMI4 Driver | Data Layer (THIS DRIVER)
+ * | (this file) |
+ * +-----+-----+-------+----------+---------+
+ * | I2C | SPI | SMBus | etc. | Physical Layer
+ * +-----+-----+-------+----------+---------+
+ *
+ * Each of the physical layer drivers is contained in a file called
+ * rmi_phys_xxx.c. Someone compiling the kernel enables CONFIG_RMI and then
+ * one or more CONFIG_RMI_xxx options in the .config file. For example, when
+ * CONFIG_RMI_I2C=m is enabled, a rmi.ko and a rmi_phys_i2c.ko will be
+ * compiled. rmi_phys_i2c.ko will depend on rmi.ko, so when rmi_phys_i2c.ko
+ * is loaded, rmi.ko will automatically be loaded. Each of the physical
+ * layer drivers is a platform_driver that may handle suspend/resume, etc.,
+ * so this driver does not do so.
+ *
+ * The register paradigm of RMI is a "pull" rather than "push" data flow.
+ * As such, it is the application driver that needs to implement either
+ * polling or interrupt driven, and the physical driver merely handles
+ * the register accesses. For interrupt driven, the application registers
+ * an "attention" function that may be called in interrupt context by the
+ * physical driver if an attention interrupt is available. The physical
+ * driver notifies the application through the polling_required variable,
+ * and the application driver must do one or the other based on this variable.
+ *
+ * At this point in time, there can only be one application driver per
+ * physical driver.
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+static const char drvname[] = "rmi4";
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/hrtimer.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+
+#include "rmi.h"
+#include "rmi_core.h"
+#include "rmi_functions.h"
+
+/* we need these to control the device and query interrupts */
+unsigned short fn01QueryBaseAddr; /* RMI4 device control */
+EXPORT_SYMBOL(fn01QueryBaseAddr);
+unsigned short fn01ControlBaseAddr;
+EXPORT_SYMBOL(fn01ControlBaseAddr);
+unsigned int interruptRegisterCount;
+EXPORT_SYMBOL(interruptRegisterCount);
+
+#define PDT_START_SCAN_LOCATION 0x00E9
+#define PDT_END_SCAN_LOCATION 0x000A
+#define PDT_ENTRY_SIZE 0x0006
+
+static LIST_HEAD(phys_drivers);
+static DEFINE_MUTEX(phys_drivers_mutex);
+static LIST_HEAD(app_drivers);
+static DEFINE_MUTEX(app_drivers_mutex);
+static DEFINE_MUTEX(rfi_mutex);
+static LIST_HEAD(fns_list);
+static DEFINE_MUTEX(fns_mutex);
+
+
+#if RMI_ALLOC_STATS
+int appallocsrmi;
+EXPORT_SYMBOL(appallocsrmi);
+int rfiallocsrmi;
+EXPORT_SYMBOL(rfiallocsrmi);
+int fnallocsrmi;
+EXPORT_SYMBOL(fnallocsrmi);
+#endif
+
+/* NOTE: Developer - add in any new RMI4 fn data info - function number
+ and ptrs to report, config, init and detect functions. This data is
+ used to point to the functions that need to be called to config, init,
+ detect and report data for the new RMI4 function. These only need to
+ be added for RMI4 functions that support data source - like 2D sensors,
+ buttons, LEDs, GPIOs, etc. Refer to the RMI4 specification for
+ information on these RMI4 functions and what data they report.
+*/
+
+static struct rmi_functions_data
+ rmi4_supported_data_src_functions[rmi4_num_supported_data_src_fns] = {
+ /* Fn $11 */
+ {0x11, FN_11_report, FN_11_config, FN_11_init, FN_11_detect},
+ /* Fn $19 */
+ /* {0x19, FN_19_report, FN_19_config, FN_19_init, FN_19_detect), */
+};
+
+
+int rmi_read(struct rmi_application *app, unsigned short address, char *dest)
+{
+ struct rmi_phys_driver *rpd = app->rpd;
+ if (!app->rpd)
+ return -ENODEV;
+ return rpd->read(rpd, address, dest);
+}
+EXPORT_SYMBOL(rmi_read);
+
+int rmi_write(struct rmi_application *app, unsigned short address,
+ unsigned char data)
+{
+ struct rmi_phys_driver *rpd = app->rpd;
+ if (!app->rpd)
+ return -ENODEV;
+ return rpd->write(rpd, address, data);
+}
+EXPORT_SYMBOL(rmi_write);
+
+int rmi_read_multiple(struct rmi_application *app, unsigned short address,
+ char *dest, int length)
+{
+ struct rmi_phys_driver *rpd = app->rpd;
+ if (!app->rpd)
+ return -ENODEV;
+ return rpd->read_multiple(rpd, address, dest, length);
+}
+EXPORT_SYMBOL(rmi_read_multiple);
+
+int rmi_write_multiple(struct rmi_application *app, unsigned short address,
+ unsigned char *data, int length)
+{
+ struct rmi_phys_driver *rpd = app->rpd;
+ if (!app->rpd)
+ return -ENODEV;
+ return rpd->write_multiple(rpd, address, data, length);
+}
+EXPORT_SYMBOL(rmi_write_multiple);
+
+bool rmi_polling_required(struct rmi_application *app)
+{
+ return app->polling_required;
+}
+EXPORT_SYMBOL(rmi_polling_required);
+
+/* This function searches for a match between an app driver and physical
+ * driver and binds them together.
+ */
+static void match_and_bind(struct rmi_application *app,
+ struct rmi_phys_driver *rpd)
+{
+ app->polling_required = rpd->polling_required;
+
+ if (app->probe(app, &rpd->rmi)) {
+ /* Found a match, bind them together. */
+ /* The try_module_get() makes sure that the physical
+ * driver cannot be unloaded while a app driver is
+ * using it.
+ */
+ if (try_module_get(rpd->module)) {
+ app->rpd = rpd;
+ rpd->app = app;
+ printk(KERN_INFO "%s: %s is %s bound to %s\n",
+ __func__, drvname, app->name, rpd->name);
+ rpd->attention = app->attention;
+ app->config(app);
+ }
+ } else {
+ app->polling_required = false;
+ }
+}
+
+/* This function is here to provide a way for external modules to access the
+ * functions list. It will try to find a matching function base on the passed
+ * in RMI4 function number and return the pointer to the struct rmi_functions
+ * if a match is found or NULL if not found.
+ */
+struct rmi_functions *rmi_find_function(int functionNum)
+{
+ struct rmi_functions *fn;
+ bool found = false;
+
+ list_for_each_entry(fn, &fns_list, link) {
+ if (functionNum == fn->functionNum) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return NULL;
+ else
+ return fn;
+}
+EXPORT_SYMBOL(rmi_find_function);
+
+/* This function calls init for all of the functions on the functions list and
+ * passes in the input_dev ptr so that each fn can store it for later use.
+ */
+int rmi_functions_init(struct input_dev *inputdev)
+{
+ int retval = 0;
+ struct rmi_functions *fn;
+
+ /* Set input device specific params for each data source...*/
+ list_for_each_entry(fn, &fns_list, link) {
+ if (fn->init) {
+ /* store the input_dev ptr for use later */
+ fn->input = inputdev;
+ retval = fn->init(fn->input);
+ } else {
+ /* the developer did not add in the pointer to the init
+ function into rmi4_supported_data_src_functions */
+ printk(KERN_ERR
+ "%s: No init function for function 0x%x\n",
+ __func__, fn->functionNum);
+ }
+ }
+
+ return retval;
+}
+EXPORT_SYMBOL(rmi_functions_init);
+
+int rmi_register_phys_driver(struct rmi_phys_driver *rpd)
+{
+ struct rmi_application *app;
+ int i;
+ unsigned char std_queries[21];
+ unsigned char interruptCount;
+ struct rmi_function_info *rfi;
+ struct rmi_function_descriptor rmi_fd;
+ struct rmi_functions *fn;
+ bool found;
+ int retval;
+
+ if (!rpd->name) {
+ printk(KERN_ERR "%s: %s: Physical driver must specify a name\n",
+ __func__, drvname);
+ return -EINVAL;
+ }
+ if (!rpd->write) {
+ printk(KERN_ERR
+ "%s: %s: Physical driver %s must specify a writer.\n",
+ __func__, drvname, rpd->name);
+ return -EINVAL;
+ }
+ if (!rpd->read) {
+ printk(KERN_ERR
+ "%s: %s: Physical driver %s must specify a reader.\n",
+ __func__, drvname, rpd->name);
+ return -EINVAL;
+ }
+ if (!rpd->write_multiple) {
+ printk(KERN_ERR "%s: %s: Physical driver %s must specify a "
+ "multiple writer.\n",
+ __func__, drvname, rpd->name);
+ return -EINVAL;
+ }
+ if (!rpd->read_multiple) {
+ printk(KERN_ERR "%s: %s: Physical driver %s must specify a "
+ "multiple reader.\n",
+ __func__, drvname, rpd->name);
+ return -EINVAL;
+ }
+ if (!rpd->module) {
+ printk(KERN_ERR
+ "%s: %s: Physical driver %s must specify a module.\n",
+ __func__, drvname, rpd->name);
+ return -EINVAL;
+ }
+
+ pr_debug("%s: %s: Registering phys driver %s\n",
+ __func__, drvname, rpd->name);
+
+ rpd->attention = 0;
+
+ /* Get some information from the device */
+ {
+ pr_debug("%s: Functions:\n", __func__);
+
+ interruptCount = 0;
+
+ /* init the physical drivers RMI module
+ info list of functions */
+ INIT_LIST_HEAD(&rpd->rmi.functions);
+
+ /* Read the Page Descriptor Table to determine what functions
+ are present */
+ for (i = PDT_START_SCAN_LOCATION;
+ i > PDT_END_SCAN_LOCATION;
+ i -= PDT_ENTRY_SIZE) {
+ retval = rpd->read_multiple(rpd, i, (char *)&rmi_fd,
+ sizeof(rmi_fd));
+ if (!retval) {
+ rfi = NULL;
+
+ if (rmi_fd.functionNum) {
+ switch (rmi_fd.functionNum & 0xff) {
+ case 0x01:
+ pr_debug("%s: Fn $01 Found - RMI Device Control\n", __func__);
+ /* Save Fn $01 query and control base addresses since
+ we'll need them later to get/set properties and check
+ interrupts. There is only one Fn $01 for the device
+ that is used to control and query device specific info
+ so we only need to save it globally here for later use.
+ */
+ fn01QueryBaseAddr =
+ rmi_fd.queryBaseAddr;
+ fn01ControlBaseAddr =
+ rmi_fd.controlBaseAddr;
+ break;
+
+ default:
+ if (rmi_fd.interruptSrcCnt) {
+ rfi = kmalloc(sizeof(*rfi), GFP_KERNEL);
+
+ if (!rfi) {
+ printk(KERN_ERR "%s: %s: could not allocate memory for function 0x%x\n",
+ __func__, drvname, rmi_fd.functionNum);
+ retval = -ENOMEM;
+ goto exit_fail;
+ } else {
+ INC_ALLOC_STAT(rfi);
+
+ /* Get the ptr to the detect function based on
+ the function number */
+ found = false;
+ list_for_each_entry(fn, &fns_list, link) {
+ /* check if function number matches - if so
+ call that detect function */
+ if (fn->functionNum == rmi_fd.functionNum) {
+ found = true;
+ fn->detect(rpd->app, rfi, &rmi_fd,
+ interruptCount);
+ }
+ }
+
+ if (!found) {
+ printk(KERN_ERR "%s: %s: could not find support for function 0x%x\n",
+ __func__, drvname, rmi_fd.functionNum);
+ }
+ }
+ } else {
+ printk(KERN_INFO "%s: %s: Found Function %02x - Ignored.\n", __func__, drvname, rmi_fd.functionNum & 0xff);
+ }
+ break;
+ }
+
+ /* bump interrupt count for
+ next iteration */
+ interruptCount +=
+ (rmi_fd.interruptSrcCnt & 0x7);
+
+ /* We only want to add functions
+ to the list that have
+ data associated with them. */
+ if (rfi && rmi_fd.interruptSrcCnt) {
+ pr_debug("%s: Adding function "
+ "0x%x with %d sources.\n",
+ drvname, rfi->functionNum,
+ rfi->numSources);
+
+ /* link this function info to
+ the RMI module infos list
+ of functions */
+ mutex_lock(&rfi_mutex);
+ list_add_tail(&rfi->link,
+ &rpd->rmi.functions);
+ mutex_unlock(&rfi_mutex);
+ }
+ } else {
+ /* A zero in the function number
+ signals the end of the PDT */
+ pr_debug("%s: Found End of PDT\n",
+ __func__);
+ break;
+ }
+ } else {
+ /* failed to read next PDT entry - end PDT
+ scan - this may result in an incomplete set
+ of recognized functions - should probably
+ return an error but the driver may still be
+ viable for diagnostics and debugging so let's
+ let it continue. */
+ printk(KERN_ERR "%s: %s: Read Error 0x%x when "
+ "reading next PDT entry - "
+ "ending PDT scan.\n",
+ __func__, drvname, retval);
+ break;
+ }
+ }
+
+ /* calculate the interrupt register count - used in the
+ ISR to read the correct number of interrupt registers */
+ interruptRegisterCount = (interruptCount + 7) / 8;
+
+ /* Function $01 will be used to query the product properties,
+ and product ID so we had to read the PDT above first to get
+ the Fn $01 query address and prior to filling in the product
+ info. NOTE: Even an unflashed device will still have FN $01.
+ */
+
+ /* Load up the standard queries and get the RMI4 module info */
+ retval = rpd->read_multiple(rpd, fn01QueryBaseAddr, std_queries,
+ sizeof(std_queries));
+ if (retval) {
+ printk(KERN_ERR "%s: %s: Failed reading queries\n",
+ __func__, drvname);
+ retval = -EIO;
+ goto exit_fail;
+ }
+
+ /* Currently supported RMI version is 4.0 */
+ rpd->rmi.rmi_maj_ver = 4;
+ rpd->rmi.rmi_min_ver = 0;
+
+ /* get manufacturer id, properties, product info,
+ date code, tester id, serial num and product id (name) */
+ rpd->rmi.mfgid = std_queries[0];
+ rpd->rmi.properties = std_queries[1];
+
+ rpd->rmi.prod_info[0] = std_queries[2];
+ rpd->rmi.prod_info[1] = std_queries[3];
+
+ /* year - 2001-2032 */
+ rpd->rmi.date_code[0] = std_queries[4] & 0x1f;
+ /* month - 1-12 */
+ rpd->rmi.date_code[1] = std_queries[5] & 0x0f;
+ /* day - 1-31 */
+ rpd->rmi.date_code[2] = std_queries[6] & 0x1f;
+
+ rpd->rmi.tester_id = ((std_queries[7] & 0x7f) << 8) |
+ (std_queries[8] & 0x7f);
+
+ rpd->rmi.serial_num = ((std_queries[9] & 0x7f) << 8) |
+ (std_queries[10] & 0x7f);
+
+ memcpy(rpd->rmi.prod_id, &std_queries[11], 10);
+ rpd->rmi.prod_id[10] = 0;
+
+ pr_debug("%s: RMI Protocol: %d.%d\n",
+ __func__, rpd->rmi.rmi_maj_ver, rpd->rmi.rmi_min_ver);
+ pr_debug("%s: Manufacturer: %d", __func__,
+ rpd->rmi.mfgid);
+
+ if (rpd->rmi.mfgid == 1)
+ pr_debug(" (Synaptics)");
+ pr_debug("\n");
+
+ pr_debug("%s: Properties: 0x%x\n",
+ __func__, rpd->rmi.properties);
+ pr_debug("%s: Product Info: 0x%x 0x%x\n",
+ __func__, rpd->rmi.prod_info[0], rpd->rmi.prod_info[1]);
+ pr_debug("%s: Date Code: Year : %d Month: %d Day: %d\n",
+ __func__, rpd->rmi.date_code[0], rpd->rmi.date_code[1],
+ rpd->rmi.date_code[2]);
+ pr_debug("%s: Tester ID: %d\n", __func__, rpd->rmi.tester_id);
+ pr_debug("%s: Serial Number: 0x%x\n",
+ __func__, rpd->rmi.serial_num);
+ pr_debug("%s: Product ID: %s\n", __func__, rpd->rmi.prod_id);
+ }
+
+ /* Add physical driver struct to list */
+ mutex_lock(&phys_drivers_mutex);
+ list_add_tail(&rpd->drivers, &phys_drivers);
+ mutex_unlock(&phys_drivers_mutex);
+
+ /* Do a probe for any applications that are registered and bind this
+ physical driver to them */
+ list_for_each_entry(app, &app_drivers, apps) {
+ /* Only check apps that are not already bound */
+ if (!app->rpd)
+ match_and_bind(app, rpd);
+ }
+
+ pr_debug("%s: Registered phys driver %s\n", __func__, rpd->name);
+
+ return 0;
+
+exit_fail:
+ return retval;
+}
+EXPORT_SYMBOL(rmi_register_phys_driver);
+
+int rmi_unregister_phys_driver(struct rmi_phys_driver *rpd)
+{
+ if (rpd->app) {
+ printk(KERN_WARNING "%s: %s: WARNING: unregister of %s while %s still attached\n",
+ __func__, drvname, rpd->name, rpd->app->name);
+ }
+
+ pr_debug("%s: Unregistering phys driver %s\n", __func__, rpd->name);
+ mutex_lock(&phys_drivers_mutex);
+ list_del(&rpd->drivers);
+ mutex_unlock(&phys_drivers_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(rmi_unregister_phys_driver);
+
+struct rmi_application *rmi_register_application(const char *name,
+ void (*attention)(struct rmi_phys_driver *pd, int instance),
+ int (*probe)(struct rmi_application *app,
+ const struct rmi_module_info *rmi),
+ void (*config)(struct rmi_application *app))
+{
+ struct rmi_application *app;
+ struct rmi_phys_driver *rpd;
+
+ if (!name) {
+ printk(KERN_ERR "%s: %s: Application driver must specify a name\n",
+ __func__, drvname);
+ return 0;
+ }
+
+ if (!attention) {
+ printk(KERN_ERR "%s: %s: Application driver %s must specify attention notifier.\n",
+ __func__, drvname, name);
+ return 0;
+ }
+
+ if (!probe) {
+ printk(KERN_ERR "%s: %s: Application driver %s must specify a probe function.\n",
+ __func__, drvname, name);
+ return 0;
+ }
+
+ if (!config) {
+ printk(KERN_ERR "%s: %s: Application driver %s must specify a config function.\n",
+ __func__, drvname, name);
+ return 0;
+ }
+
+ pr_debug("%s: Registering app driver %s\n", __func__, name);
+
+ app = kmalloc(sizeof(*app), GFP_KERNEL);
+ if (!app) {
+ printk(KERN_ERR "%s: %s: Out of memory\n", __func__, drvname);
+ return 0;
+ }
+ INC_ALLOC_STAT(app);
+
+ app->name = name;
+ app->attention = attention;
+ app->probe = probe;
+ app->config = config;
+ app->rpd = 0;
+
+ mutex_lock(&app_drivers_mutex);
+ list_add_tail(&app->apps, &app_drivers);
+ mutex_unlock(&app_drivers_mutex);
+
+ /* Probe for any matches with physical drivers and bind them. */
+ list_for_each_entry(rpd, &phys_drivers, drivers) {
+ if (!rpd->app)
+ match_and_bind(app, rpd);
+ }
+
+ pr_debug("%s: Registered app driver %s (%p)\n", __func__, name, app);
+
+ return app;
+}
+EXPORT_SYMBOL(rmi_register_application);
+
+void rmi_unregister_application(struct rmi_application *app)
+{
+ struct rmi_application *tmp;
+ int found = 0;
+
+ if (!app)
+ return;
+
+ pr_debug("%s: Unregistering app driver %s (%p)\n",
+ __func__, app->name, app);
+
+ list_for_each_entry(tmp, &app_drivers, apps) {
+ if (tmp == app) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ printk(KERN_ERR "%s: %s: Removing rmi application %s: not found\n",
+ __func__, drvname, app->name);
+ return;
+ }
+
+ if (app->rpd) {
+ /* Release the phys driver so it can be unloaded. */
+ module_put(app->rpd->module);
+ app->rpd->app = 0;
+ }
+
+ list_del(&app->apps);
+ kfree(app);
+ DEC_ALLOC_STAT(app);
+
+ pr_debug("%s: Unregistered app driver %p\n", __func__, app);
+}
+EXPORT_SYMBOL(rmi_unregister_application);
+
+static int __init rmi_core_init(void)
+{
+ int i;
+ struct rmi_functions_data *rmi4_fn;
+
+ pr_debug("%s: Register Mapped Interface Data Layer Driver\n", __func__);
+
+ /* Initialize global list of RMI4 Functions that have data sources.
+ We need to add all new functions to this list so that we will have
+ pointers to the associated functions for init, config, report and
+ detect. See rmi.h for more details. The developer will add a new
+ RMI4 function number in the array in rmi.h, then add a new file to
+ the build (called rmi_function_XX.c where XX is the hex number for
+ the added RMI4 function). The rest should be automatic.
+ */
+
+ /* for each function number defined in rmi.h creat a new rmi_function
+ struct and initialize the pointers to the servicing functions and then
+ add it into the global list for function support.
+ */
+ for (i = 0; i < rmi4_num_supported_data_src_fns; i++) {
+ /* Add new rmi4 function struct to list */
+ struct rmi_functions *fn = kmalloc(sizeof(*fn), GFP_KERNEL);
+ if (!fn) {
+ printk(KERN_ERR "%s: %s: could not allocate memory "
+ "for rmi_function struct for function 0x%x\n",
+ __func__, drvname,
+ rmi4_supported_data_src_functions[i].functionNumber);
+ return -ENOMEM;
+ } else {
+ INC_ALLOC_STAT(fn);
+
+ rmi4_fn = &rmi4_supported_data_src_functions[i];
+ fn->functionNum = rmi4_fn->functionNumber;
+ /* Fill in ptrs to functions. The functions are
+ linked in from a file called rmi_function_xx.c
+ where xx is the hex number of the RMI4 function
+ from the RMI4 spec. Also, the function prototypes
+ need to be added to rmi_function_xx.h - also where
+ xx is the hex number of the RMI4 function. So
+ that you don't get compile errors and that new
+ header needs to be included in the rmi.h header file.
+ */
+ fn->report = rmi4_fn->reportFn;
+ fn->config = rmi4_fn->configFn;
+ fn->init = rmi4_fn->initFn;
+ fn->detect = rmi4_fn->detectFn;
+
+ /* Add the new fn to the global list */
+ mutex_lock(&fns_mutex);
+ list_add_tail(&fn->link, &fns_list);
+ mutex_unlock(&fns_mutex);
+ }
+ }
+
+ return 0;
+}
+
+static void __exit rmi_core_exit(void)
+{
+ struct rmi_application *app, *apptmp;
+
+ /* These lists should be empty, but just in case . . . */
+ mutex_lock(&app_drivers_mutex);
+ list_for_each_entry_safe(app, apptmp, &app_drivers, apps) {
+ list_del(&app->apps);
+ kfree(app);
+ DEC_ALLOC_STAT(app);
+ }
+ mutex_unlock(&app_drivers_mutex);
+
+ CHECK_ALLOC_STAT(app);
+}
+
+/* TODO: Investigate implimenting "rmi" bus and device and driver on that bus
+ as per Documentation/driver-model/bus.txt */
+
+module_init(rmi_core_init);
+module_exit(rmi_core_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("RMI4 Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/rmi_core.h b/drivers/input/touchscreen/rmi_core.h
new file mode 100755
index 0000000..174b427
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_core.h
@@ -0,0 +1,58 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Data Layer Core Header.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated.
+ *
+ */
+/*
+ *
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#ifndef _RMI_CORE_H
+#define _RMI_CORE_H
+
+struct rmi_application {
+ const char *name;
+ void (*attention)(struct rmi_phys_driver *pd, int instance);
+ /* Probe Function
+ * This function is called to give the application layer an
+ * opportunity to claim an RMI device. The application layer cannot
+ * read RMI registers at this point. Defer that to the config
+ * function call which occurs immediately after a successful probe.
+ */
+ int (*probe)(struct rmi_application *app,
+ const struct rmi_module_info *rmi);
+ /* Config Function
+ * This function is called after a successful probe. It gives the
+ * application driver an opportunity to query and/or configure an RMI
+ * device before data starts flowing.
+ */
+ void (*config)(struct rmi_application *app);
+ /* Standard kernel linked list implementation.
+ * Documentation on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head apps;
+ struct rmi_phys_driver *rpd;
+ bool polling_required;
+ struct hrtimer timer;
+ struct work_struct work;
+};
+
+#endif
+
diff --git a/drivers/input/touchscreen/rmi_function_11.c b/drivers/input/touchscreen/rmi_function_11.c
new file mode 100755
index 0000000..999d911
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_function_11.c
@@ -0,0 +1,438 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Function $11 support for 2D.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ * For every RMI4 function that has a data source - like 2D sensors,
+ * buttons, LEDs, GPIOs, etc. - the user will create a new rmi_function_xx.c
+ * file and add these functions to perform the config(), init(), report()
+ * and detect() functionality. The function pointers are then srored under
+ * the RMI function info and these functions will automatically be called by
+ * the global config(), init(), report() and detect() functions that will
+ * loop through all data sources and call the data sources functions using
+ * these functions pointed to by the function ptrs.
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/input.h>
+
+#include "rmi.h"
+#include "rmi_core.h"
+#include "rmi_functions.h"
+
+/* RMI4 device control == function 0x01 */
+extern unsigned short fn01ControlBaseAddr;
+
+static int sensorMaxX;
+static int sensorMaxY;
+
+/*
+ * This reads in a sample and reports the function $11 source data to the
+ * input subsystem. It is used for both polling and interrupt driven
+ * operation. This is called a lot so don't put in any informational
+ * printks since they will slow things way down!
+ */
+int FN_11_report(struct rmi_application *app,
+ struct rmi_function_info *rfi, struct input_dev *input)
+{
+ unsigned char values[2] = {0, 0};
+ unsigned char data[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+ /* number of touch points - fingers down in this case */
+ int fingerDownCount;
+ int X, Y, Z, W, Wy, Wx;
+ int finger;
+ int fn11FingersSupported;
+ int fn11FingerRegisters;
+ unsigned short fn11DataBaseAddr;
+ unsigned char fn11DataRegBlockSize;
+ static bool wasdown;
+
+ fingerDownCount = 0;
+
+ /* get 2D sensor finger data */
+
+ /* First get the finger status field - the size of the finger status
+ field is determined by the number of finger supporte - 2 bits per
+ finger, so the number of registers to read is:
+ registerCount = ceil(numberOfFingers/4).
+ Read the required number of registers and check each 2 bit field to
+ determine if a finger is down:
+ 00 = finger not present,
+ 01 = finger present and data accurate,
+ 10 = finger present but data may not be accurate,
+ 11 = reserved for product use.
+ */
+ fn11FingersSupported = rfi->numDataPoints;
+ fn11FingerRegisters = (fn11FingersSupported + 3)/4;
+
+ fn11DataBaseAddr = rfi->funcDescriptor.dataBaseAddr;
+
+ if (rmi_read_multiple(app, fn11DataBaseAddr, values,
+ fn11FingerRegisters)) {
+ printk(KERN_ERR "%s: RMI4 function $11 report: "
+ "Could not read finger status registers 0x%x\n",
+ __func__, fn11DataBaseAddr);
+ return 0;
+ }
+
+ /* For each finger present, read the proper number of registers
+ to get absolute data. */
+ fn11DataRegBlockSize = rfi->dataRegBlockSize;
+
+ for (finger = 0; finger < fn11FingersSupported; finger++) {
+ int reg;
+ int fingerShift;
+ int fingerStatus;
+
+ /* determine which data byte the finger status is in */
+ reg = finger/4;
+ /* bit shift to get finger's status */
+ fingerShift = (finger % 4) * 2;
+ fingerStatus = (values[reg] >> fingerShift) & 3;
+
+ /* if finger status indicates a finger is present then
+ read the finger data and report it */
+ if (fingerStatus == 1 || fingerStatus == 2) {
+ /* number of active touch points not same as
+ number of supported fingers */
+ fingerDownCount++;
+
+ /* Read the finger data */
+ if (rmi_read_multiple(app, fn11DataBaseAddr +
+ ((finger * fn11DataRegBlockSize) +
+ fn11FingerRegisters),
+ data, fn11DataRegBlockSize)) {
+ printk(KERN_ERR "%s: RMI4 function $11 report: "
+ "Could not read finger data registers "
+ "0x%x\n", __func__,
+ fn11DataBaseAddr +
+ ((finger * fn11DataRegBlockSize) +
+ fn11FingerRegisters));
+ return 0;
+ } else {
+ X = (data[0] & 0x1f) << 4;
+ X |= data[2] & 0xf;
+ Y = (data[1] & 0x1f) << 4;
+ Y |= (data[2] >> 4) & 0xf;
+ W = data[3];
+
+ /* upper 4 bits of W are Wy,
+ lower 4 of W are Wx */
+ Wy = (W >> 4) & 0x0f;
+ Wx = W & 0x0f;
+
+ Z = data[4];
+
+ /* if this is the first finger report normal
+ ABS_X, ABS_Y, PRESSURE, TOOL_WIDTH events for
+ non-MT apps. Apps that support Multi-touch
+ will ignore these events and use the MT events.
+ Apps that don't support Multi-touch will still
+ function.
+ */
+ if (fingerDownCount == 1) {
+ input_report_abs(input, ABS_X, X);
+ input_report_abs(input, ABS_Y, Y);
+ input_report_abs(input, ABS_PRESSURE,
+ Z);
+ input_report_abs(input, ABS_TOOL_WIDTH,
+ max(Wx, Wy));
+ input_report_key(input, BTN_TOUCH, 1);
+ wasdown = true;
+ }
+
+ /* Report Multi-Touch events for each finger */
+ /* major axis of touch area ellipse */
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR,
+ max(Wx, Wy));
+ /* minor axis of touch area ellipse */
+ input_report_abs(input, ABS_MT_TOUCH_MINOR,
+ min(Wx, Wy));
+ /* Currently only 2 supported - 1 or 0 */
+ input_report_abs(input, ABS_MT_ORIENTATION,
+ (Wx > Wy ? 1 : 0));
+ input_report_abs(input, ABS_MT_POSITION_X, X);
+ input_report_abs(input, ABS_MT_POSITION_Y, Y);
+ /* Tracking ID reported but not used yet */
+ input_report_abs(input, ABS_MT_TRACKING_ID,
+ finger+1);
+ /* MT sync between fingers */
+ input_mt_sync(input);
+ }
+ }
+ }
+
+ if (fingerDownCount) {
+ /* touch will be non-zero if we had any reported events */
+ input_sync(input); /* sync after groups of events */
+ } else {
+ /* if we had a finger down before and now we don't have
+ any we need to send a button up and a sync. */
+ if (wasdown) {
+ wasdown = false;
+ input_report_key(input, BTN_TOUCH, 0);
+ input_sync(input); /* sync after groups of events */
+ }
+ }
+
+ /* return the number of touch points: fingers down or buttons pressed */
+ return fingerDownCount;
+}
+
+int FN_11_config(struct rmi_application *app, struct rmi_function_info *rfi)
+{
+ /* For the data source - print info and do any
+ source specific configuration. */
+ unsigned char data[14];
+ int retval = 0;
+
+ pr_debug("%s: RMI4 function $11 config\n", __func__);
+
+ /* Get and print some info about the data source... */
+
+ /* To Query 2D devices we need to read from the address obtained
+ * from the function descriptor stored in the RMI function info.
+ */
+ retval = rmi_read_multiple(app, rfi->funcDescriptor.queryBaseAddr,
+ data, 9);
+ if (retval) {
+ printk(KERN_ERR "%s: RMI4 function $11 config:"
+ "Could not read function query registers 0x%x\n",
+ __func__, rfi->funcDescriptor.queryBaseAddr);
+ } else {
+ pr_debug("%s: Number of Fingers: %d\n",
+ __func__, data[1] & 7);
+ pr_debug("%s: Is Configurable: %d\n",
+ __func__, data[1] & (1 << 7) ? 1 : 0);
+ pr_debug("%s: Has Gestures: %d\n",
+ __func__, data[1] & (1 << 5) ? 1 : 0);
+ pr_debug("%s: Has Absolute: %d\n",
+ __func__, data[1] & (1 << 4) ? 1 : 0);
+ pr_debug("%s: Has Relative: %d\n",
+ __func__, data[1] & (1 << 3) ? 1 : 0);
+
+ pr_debug("%s: Number X Electrodes: %d\n",
+ __func__, data[2] & 0x1f);
+ pr_debug("%s: Number Y Electrodes: %d\n",
+ __func__, data[3] & 0x1f);
+ pr_debug("%s: Maximum Electrodes: %d\n",
+ __func__, data[4] & 0x1f);
+
+ pr_debug("%s: Absolute Data Size: %d\n",
+ __func__, data[5] & 3);
+
+ pr_debug("%s: Has XY Dist: %d\n",
+ __func__, data[7] & (1 << 7) ? 1 : 0);
+ pr_debug("%s: Has Pinch: %d\n",
+ __func__, data[7] & (1 << 6) ? 1 : 0);
+ pr_debug("%s: Has Press: %d\n",
+ __func__, data[7] & (1 << 5) ? 1 : 0);
+ pr_debug("%s: Has Flick: %d\n",
+ __func__, data[7] & (1 << 4) ? 1 : 0);
+ pr_debug("%s: Has Early Tap: %d\n",
+ __func__, data[7] & (1 << 3) ? 1 : 0);
+ pr_debug("%s: Has Double Tap: %d\n",
+ __func__, data[7] & (1 << 2) ? 1 : 0);
+ pr_debug("%s: Has Tap and Hold: %d\n",
+ __func__, data[7] & (1 << 1) ? 1 : 0);
+ pr_debug("%s: Has Tap: %d\n",
+ __func__, data[7] & 1 ? 1 : 0);
+ pr_debug("%s: Has Palm Detect: %d\n",
+ __func__, data[8] & 1 ? 1 : 0);
+ pr_debug("%s: Has Rotate: %d\n",
+ __func__, data[8] & (1 << 1) ? 1 : 0);
+
+ retval = rmi_read_multiple(app,
+ rfi->funcDescriptor.controlBaseAddr, data, 14);
+ if (retval) {
+ printk(KERN_ERR "%s: RMI4 function $11 config:"
+ "Could not read control registers 0x%x\n",
+ __func__, rfi->funcDescriptor.controlBaseAddr);
+ return retval;
+ }
+
+ /* Store these for use later...*/
+ sensorMaxX = ((data[6] & 0x1f) << 8) | ((data[7] & 0xff) << 0);
+ sensorMaxY = ((data[8] & 0x1f) << 8) | ((data[9] & 0xff) << 0);
+
+ pr_debug("%s: Sensor Max X: %d\n", __func__, sensorMaxX);
+ pr_debug("%s: Sensor Max Y: %d\n", __func__, sensorMaxY);
+ }
+
+ return retval;
+}
+
+/* Initialize any function $11 specific params and settings - input
+ * settings, device settings, etc.
+ */
+int FN_11_init(struct input_dev *input)
+{
+ pr_debug("%s: RMI4 function $11 init\n", __func__);
+
+ /* need to init the input abs params for the 2D */
+ input->evbit[0] = BIT(EV_ABS);
+
+ /* Use the max X and max Y read from the device...*/
+ input_set_abs_params(input, ABS_X, 0, sensorMaxX, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, sensorMaxY, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, sensorMaxX, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, sensorMaxY, 0, 0);
+
+ input_set_abs_params(input, ABS_PRESSURE, 0, 255, 0, 0);
+ input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 15, 0, 0);
+
+ input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 15, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 15, 0, 0);
+ input_set_abs_params(input, ABS_MT_ORIENTATION, 0, 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_TRACKING_ID, 1, 10, 0, 0);
+
+ return 0;
+}
+
+int FN_11_detect(struct rmi_application *app, struct rmi_function_info *rfi,
+ struct rmi_function_descriptor *fd, unsigned int interruptCount)
+{
+ char fn11Queries[9];
+ int i;
+ unsigned short fn11InterruptOffset;
+ unsigned char fn11AbsDataSize;
+ unsigned char fn11AbsDataBlockSize;
+ int fn11HasPinch, fn11HasFlick, fn11HasTap;
+ int fn11HasTapAndHold, fn11HasDoubleTap;
+ int fn11HasEarlyTap, fn11HasPress;
+ int fn11HasPalmDetect, fn11HasRotate;
+ int fn11HasRel;
+ unsigned char f11_egr_0, f11_egr_1;
+ unsigned int fn11AllDataBlockSize;
+ int retval = 0;
+
+ pr_debug("%s: RMI4 function $11 detect\n", __func__);
+
+ /* Store addresses - used elsewhere to read data,
+ * control, query, etc. */
+ rfi->funcDescriptor.queryBaseAddr = fd->queryBaseAddr;
+ rfi->funcDescriptor.commandBaseAddr = fd->commandBaseAddr;
+ rfi->funcDescriptor.controlBaseAddr = fd->controlBaseAddr;
+ rfi->funcDescriptor.dataBaseAddr = fd->dataBaseAddr;
+ rfi->funcDescriptor.interruptSrcCnt = fd->interruptSrcCnt;
+ rfi->funcDescriptor.functionNum = fd->functionNum;
+
+ rfi->numSources = fd->interruptSrcCnt;
+
+ /* need to get number of fingers supported, data size, etc. -
+ to be used when getting data since the number of registers to
+ read depends on the number of fingers supported and data size. */
+ retval = rmi_read_multiple(app, fd->queryBaseAddr, fn11Queries,
+ sizeof(fn11Queries));
+ if (retval) {
+ printk(KERN_ERR "%s: RMI4 function $11 detect: "
+ "Could not read function query registers 0x%x\n",
+ __func__, rfi->funcDescriptor.queryBaseAddr);
+ return retval;
+ }
+
+ /* 2D data sources have only 3 bits for the number of fingers
+ supported - so the encoding is a bit wierd. */
+ rfi->numDataPoints = 2; /* default number of fingers supported */
+ if ((fn11Queries[1] & 0x7) <= 4)
+ /* add 1 since zero based */
+ rfi->numDataPoints = (fn11Queries[1] & 0x7) + 1;
+ else {
+ /* a value of 5 is up to 10 fingers - 6 and 7 are reserved
+ (shouldn't get these i int retval;n a normal 2D source). */
+ if ((fn11Queries[1] & 0x7) == 5)
+ rfi->numDataPoints = 10;
+ }
+
+ /* Need to get interrupt info to be used later when handling
+ interrupts. */
+ rfi->interruptRegister = (interruptCount + 7)/8;
+
+ /* loop through interrupts for each source in fn $11 and or in a bit
+ to the interrupt mask for each. */
+ fn11InterruptOffset = interruptCount % 8;
+
+ for (i = fn11InterruptOffset;
+ i < ((fd->interruptSrcCnt & 0x7) + fn11InterruptOffset);
+ i++)
+ rfi->interruptMask |= 1 << i;
+
+ /* Size of just the absolute data for one finger */
+ fn11AbsDataSize = fn11Queries[5] & 0x03;
+ /* One each for X and Y, one for LSB for X & Y, one for W, one for Z */
+ fn11AbsDataBlockSize = 3 + (2 * (fn11AbsDataSize == 0 ? 1 : 0));
+ rfi->dataRegBlockSize = fn11AbsDataBlockSize;
+
+ /* need to determine the size of data to read - this depends on
+ conditions such as whether Relative data is reported and if Gesture
+ data is reported. */
+ f11_egr_0 = fn11Queries[7];
+ f11_egr_1 = fn11Queries[8];
+
+ /* Get info about what EGR data is supported, whether it has
+ Relative data supported, etc. */
+ fn11HasPinch = f11_egr_0 & 0x40;
+ fn11HasFlick = f11_egr_0 & 0x10;
+ fn11HasTap = f11_egr_0 & 0x01;
+ fn11HasTapAndHold = f11_egr_0 & 0x02;
+ fn11HasDoubleTap = f11_egr_0 & 0x04;
+ fn11HasEarlyTap = f11_egr_0 & 0x08;
+ fn11HasPress = f11_egr_0 & 0x20;
+ fn11HasPalmDetect = f11_egr_1 & 0x01;
+ fn11HasRotate = f11_egr_1 & 0x02;
+ fn11HasRel = fn11Queries[1] & 0x08;
+
+ /* Size of all data including finger status, absolute data for each
+ finger, relative data and EGR data */
+ fn11AllDataBlockSize =
+ /* finger status, four fingers per register */
+ ((rfi->numDataPoints + 3) / 4) +
+ /* absolute data, per finger times number of fingers */
+ (fn11AbsDataBlockSize * rfi->numDataPoints) +
+ /* two relative registers (if relative is being reported) */
+ 2 * fn11HasRel +
+ /* F11_2D_Data8 is only present if the egr_0
+ register is non-zero. */
+ !!(f11_egr_0) +
+ /* F11_2D_Data9 is only present if either egr_0 or
+ egr_1 registers are non-zero. */
+ (f11_egr_0 || f11_egr_1) +
+ /* F11_2D_Data10 is only present if EGR_PINCH or EGR_FLICK of
+ egr_0 reports as 1. */
+ !!(fn11HasPinch | fn11HasFlick) +
+ /* F11_2D_Data11 and F11_2D_Data12 are only present if
+ EGR_FLICK of egr_0 reports as 1. */
+ 2 * !!(fn11HasFlick);
+
+ /* Disable Interrupts. It is up to the Application Driver to
+ * turn them on when it's ready for them. */
+ retval = rmi_write(app,
+ fn01ControlBaseAddr + 1 + rfi->interruptRegister, 0);
+ if (!retval) {
+ printk(KERN_ERR "%s: Function $11 Interrupt Disable Fail: %d\n",
+ __func__, retval);
+ }
+
+ return retval;
+}
diff --git a/drivers/input/touchscreen/rmi_function_11.h b/drivers/input/touchscreen/rmi_function_11.h
new file mode 100755
index 0000000..e90d889
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_function_11.h
@@ -0,0 +1,43 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Function $11 support for 2D.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ * For every RMI4 function that has a data source - like 2D sensors,
+ * buttons, LEDs, GPIOs, etc. - the user will create a new rmi_function_xx.c
+ * file and add these functions to perform the config(), init(), report()
+ * and detect() functionality. The function pointers are then srored under
+ * the RMI function info and these functions will automatically be called by
+ * the global config(), init(), report() and detect() functions that will
+ * loop through all data sources and call the data sources functions using
+ * these functions pointed to by the function ptrs.
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+#ifndef _RMI_FUNCTION_11_H
+#define _RMI_FUNCTION_11_H
+
+int FN_11_report(struct rmi_application *app, struct rmi_function_info *rfi,
+ struct input_dev *input);
+int FN_11_config(struct rmi_application *app, struct rmi_function_info *rfi);
+int FN_11_init(struct input_dev *input);
+int FN_11_detect(struct rmi_application *app, struct rmi_function_info *rfi,
+ struct rmi_function_descriptor *fd,
+ unsigned int interruptCount);
+
+#endif
diff --git a/drivers/input/touchscreen/rmi_functions.h b/drivers/input/touchscreen/rmi_functions.h
new file mode 100644
index 0000000..75f1ded
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_functions.h
@@ -0,0 +1,111 @@
+
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Functions Definition Header File.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#ifndef _RMI_FUNCTIONS_H
+#define _RMI_FUNCTIONS_H
+
+/* This struct is for creating a list of RMI4 functions that have data sources
+ associated with them. This is to facilitate adding new support for other
+ data sources besides 2D sensors.
+ To add a new data source support, the developer will create a new file
+ and add these 4 functions below with FN$## in front of the names - where
+ ## is the hex number for the function taken from the RMI4 specification.
+
+ The function number will be associated with this and later will be used to
+ match the RMI4 function to the 4 functions for that RMI4 function number.
+
+ The user will also have to add code that adds the new rmi_functions item
+ to the global list of RMI4 functions and stores the pointers to the 4
+ functions in the function pointers.
+*/
+struct rmi_functions {
+ unsigned char functionNum;
+
+ struct input_dev *input;
+
+ /* Pointers to function specific functions for report, config, init
+ and detect. */
+ /* These ptrs. need to be filled in for every RMI4 function that has
+ data source(s) associated with it - like fn $11 (2D sensors),
+ fn $19 (buttons), etc. Each RMI4 function that has data sources
+ will be added into a list that is used to match the function
+ number against the number stored here.
+ */
+ int (*report)(struct rmi_application *app,
+ struct rmi_function_info *rfi, struct input_dev *input);
+ int (*config)(struct rmi_application *app,
+ struct rmi_function_info *rfi);
+ int (*init)(struct input_dev *input);
+ int (*detect)(struct rmi_application *app,
+ struct rmi_function_info *rfi,
+ struct rmi_function_descriptor *fd,
+ unsigned int interruptCount);
+
+ /* Standard kernel linked list implementation.
+ * Documentation on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head link;
+};
+
+
+/* Each time a new RMI4 function support is added the developer needs to
+ bump the number of supported data src functions and add the info for
+ that RMI4 function to the array along with pointers to the report,
+ config, init and detect functions that they coded in rmi_function_xx.c
+ and rmi_function_xx.h - where xx is the RMI4 function number for the new
+ RMI4 data source function. The information for the RMI4 functions is
+ obtained from the RMI4 specification document.
+*/
+#define rmi4_num_supported_data_src_fns 1
+
+/* add hdr files for all prototypes for RMI4 data source
+ functions being supported. */
+#include "rmi_function_11.h"
+/* #include "rmi_function_19.h" */
+
+typedef int(*reportFuncPtr)(struct rmi_application *app,
+ struct rmi_function_info *rfi, struct input_dev *input);
+typedef int(*configFuncPtr)(struct rmi_application *app,
+ struct rmi_function_info *rfi);
+typedef int(*initFuncPtr)(struct input_dev *input);
+typedef int(*detectFuncPtr)(struct rmi_application *app,
+ struct rmi_function_info *rfi, struct rmi_function_descriptor *fd,
+ unsigned int interruptCount);
+
+struct rmi_functions_data {
+ int functionNumber;
+ reportFuncPtr reportFn;
+ configFuncPtr configFn;
+ initFuncPtr initFn;
+ detectFuncPtr detectFn;
+};
+
+
+struct rmi_functions *rmi_find_function(int functionNum);
+int rmi_functions_init(struct input_dev *inputdev);
+
+#endif
diff --git a/drivers/input/touchscreen/rmi_i2c.h b/drivers/input/touchscreen/rmi_i2c.h
new file mode 100755
index 0000000..fecda60
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_i2c.h
@@ -0,0 +1,51 @@
+/**
+ *
+ * Synaptics RMI over I2C Physical Layer Driver Header File.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#ifndef _RMI_I2C_H
+#define _RMI_I2C_H
+
+/* Platform-specific configuration data.
+ * This structure is used by the platform-specific driver to designate
+ * specific information about the hardware. A platform client may supply
+ * an array of these to the rmi_phys_i2c driver.
+ */
+struct rmi_i2c_platformdata {
+ /* The seven-bit i2c address of the device. */
+ int i2c_address;
+ /* The number of the irq. Set to zero if polling is required. */
+ int irq;
+ /* The type of the irq (e.g., IRQF_TRIGGER_FALLING).
+ Only valid if irq != 0 */
+ int irq_type;
+};
+
+/* Descriptor structure.
+ * Describes the number of i2c devices on the bus that speak RMI.
+ */
+struct rmi_i2c_data {
+ int num_clients;
+ struct rmi_i2c_platformdata *platformdata;
+};
+
+#endif
diff --git a/drivers/input/touchscreen/rmi_i2c_gta01.c b/drivers/input/touchscreen/rmi_i2c_gta01.c
new file mode 100755
index 0000000..c3bd509
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_i2c_gta01.c
@@ -0,0 +1,117 @@
+/**
+ *
+ * Synaptics RMI4 Support for I2C the OpenMoko phone (GTA01) hardware platform.
+ * Copyright (c) 2007 - 2010, Synaptics Incorporated.
+ *
+ * To support a different device - for example if the GPIOs are different or
+ * different hardware is being used - make a copy of this file and change the
+ * name to reflect the new hardware platform then modify it to support the new
+ * platforms hardware (interrupts, IC chip, etc.).
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include "rmi_i2c.h"
+
+/* Set this to either 1 or 0 depending on your clearpad hardware. */
+#define ATTENTION_ACTIVE_LOW 1
+
+#if ATTENTION_ACTIVE_LOW
+#define IRQ_TRIGGER IRQF_TRIGGER_FALLING
+#else
+#define IRQ_TRIGGER IRQF_TRIGGER_RISING
+#endif
+
+#define GPF3 S3C2410_GPF3
+#define GPF3INT3 S3C2410_GPF3_EINT3
+#define IRQINT3 IRQ_EINT3
+
+#define GPIO_CFG s3c2410_gpio_cfgpin(S3C2410_GPF3, S3C2410_GPF3_EINT3)
+
+
+static struct rmi_i2c_platformdata rmi_i2c_dev_platformdata[] = {
+ [0] = {
+ .i2c_address = 0x20,
+ .irq = IRQINT3,
+ .irq_type = IRQ_TRIGGER,
+ },
+};
+
+static struct rmi_i2c_data rmi_platform_data = {
+ .num_clients = ARRAY_SIZE(rmi_i2c_dev_platformdata),
+ .platformdata = rmi_i2c_dev_platformdata,
+};
+
+static void
+rmi_i2c_release(struct device *dev)
+{
+ struct platform_device *pd = container_of(dev,
+ struct platform_device, dev);
+
+ kfree(pd);
+}
+
+static struct platform_device *gta01_rmi_device;
+
+/*
+ * These are the module insert and remove functions.
+ */
+static int __init
+mod_init(void)
+{
+ struct platform_device *pd;
+
+ pr_debug("%s: GTA01 RMI4 Platform Driver Init.\n", __func__);
+
+ gta01_rmi_device = pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (!pd) {
+ printk(KERN_ERR
+ "%s: Failed to alloc memory for struct platform_dev.\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ /* Set up the GPIO for interrupts */
+ GPIO_CFG;
+
+ pd->name = "rmi4-i2c";
+ pd->id = -1;
+ pd->dev.platform_data = &rmi_platform_data;
+ pd->dev.release = rmi_i2c_release;
+
+ return platform_device_register(pd);
+}
+
+static void __exit
+mod_exit(void)
+{
+ return platform_device_unregister(gta01_rmi_device);
+}
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("GTA01 (OpenMoko Phone) RMI4 over I2C Device Configuration");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/rmi_phys_i2c.c b/drivers/input/touchscreen/rmi_phys_i2c.c
new file mode 100755
index 0000000..945633b
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_phys_i2c.c
@@ -0,0 +1,578 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) I2C Physical Layer Driver.
+ * Copyright (c) 2007-2010, Synaptics Incorporated
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ *#############################################################################
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include "rmi_i2c.h"
+#include "rmi.h"
+
+/* TODO: for multiple device support will need a per-device mutex */
+#define DRIVER_NAME "rmi4-i2c"
+
+/* TODO: for multiple device support will need a per-device device name */
+#define DEVICE_NAME "rmi4-i2c"
+
+/* Used to lock access to the page address.
+ */
+static DEFINE_MUTEX(page_mutex);
+
+
+static const struct i2c_device_id rmi_i2c_id_table[] = {
+ { DEVICE_NAME, 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, rmi_i2c_id_table);
+
+
+/*
+ * This is the data kept on a per instance (client) basis. This data is
+ * always accessible by using the container_of() macro of the various elements
+ * inside.
+ */
+struct instance_data {
+ int instance_no;
+ int irq;
+ struct rmi_phys_driver rpd;
+ struct i2c_client *i2cclient; /* pointer to i2c_client for later use in
+ read, write, read_multiple, etc. */
+ int page;
+};
+
+/*
+ * RMI devices have 16-bit addressing, but some of the physical
+ * implementations (like SMBus) only have 8-bit addressing. So RMI implements
+ * a page address at 0xff of every page so we can reliable page addresses
+ * every 256 registers. This function sets the page.
+ *
+ * The page_mutex lock must be held when this function is entered.
+ *
+ * param[in] id - The pointer to the instance_data struct
+ * param[in] page - The new page address.
+ * returns zero on success, non-zero on failure.
+ */
+int
+rmi_set_page(struct instance_data *id, unsigned int page)
+{
+ char txbuf[2];
+ int retval;
+ txbuf[0] = 0xff;
+ txbuf[1] = page;
+ retval = i2c_master_send(id->i2cclient, txbuf, 2);
+ if (retval != 2) {
+ dev_err(&id->i2cclient->dev,
+ "%s: Set page fail: %d\n", __func__, retval);
+ } else {
+ retval = 0;
+ id->page = page;
+ }
+ return retval;
+}
+
+/*
+ * Read a single register through i2c.
+ *
+ * param[in] pd - The pointer to the rmi_phys_driver struct
+ * param[in] address - The address at which to start the data read.
+ * param[out] valp - Pointer to the buffer where the data will be stored.
+ * returns xero upon success (with the byte read in valp), non-zero upon error.
+ */
+static int
+rmi_i2c_read(struct rmi_phys_driver *pd, unsigned short address, char *valp)
+{
+ struct instance_data *id = container_of(pd, struct instance_data, rpd);
+ char txbuf[2];
+ int retval = 0;
+ int retry_count = 0;
+
+ /* Can't have anyone else changing the page behind our backs */
+ mutex_lock(&page_mutex);
+
+ if (((address >> 8) & 0xff) != id->page) {
+ /* Switch pages */
+ retval = rmi_set_page(id, ((address >> 8) & 0xff));
+ if (retval)
+ goto exit;
+ }
+
+retry:
+ txbuf[0] = address & 0xff;
+ retval = i2c_master_send(id->i2cclient, txbuf, 1);
+
+ if (retval != 1) {
+ dev_err(&id->i2cclient->dev, "%s: Write fail: %d\n",
+ __func__, retval);
+ goto exit;
+ }
+ retval = i2c_master_recv(id->i2cclient, txbuf, 1);
+
+ if (retval != 1) {
+ if (++retry_count == 5) {
+ dev_err(&id->i2cclient->dev,
+ "%s: Read of 0x%04x fail: %d\n",
+ __func__, address, retval);
+ } else {
+ mdelay(10);
+ rmi_set_page(id, ((address >> 8) & 0xff));
+ goto retry;
+ }
+ } else {
+ retval = 0;
+ *valp = txbuf[0];
+ }
+exit:
+ mutex_unlock(&page_mutex);
+ return retval;
+}
+
+/*
+ * Same as rmi_i2c_read, except that multiple bytes are allowed to be read.
+ *
+ * param[in] pd - The pointer to the rmi_phys_driver struct
+ * param[in] address - The address at which to start the data read.
+ * param[out] valp - Pointer to the buffer where the data will be stored. This
+ * buffer must be at least size bytes long.
+ * param[in] size - The number of bytes to be read.
+ * returns zero upon success (with the byte read in valp), non-zero upon error.
+ *
+ */
+static int
+rmi_i2c_read_multiple(struct rmi_phys_driver *pd, unsigned short address,
+ char *valp, int size)
+{
+ struct instance_data *id = container_of(pd, struct instance_data, rpd);
+ char txbuf[2];
+ int retval = 0;
+ int retry_count = 0;
+
+ /* Can't have anyone else changing the page behind our backs */
+ mutex_lock(&page_mutex);
+
+ if (((address >> 8) & 0xff) != id->page) {
+ /* Switch pages */
+ retval = rmi_set_page(id, ((address >> 8) & 0xff));
+ if (retval)
+ goto exit;
+ }
+
+retry:
+ txbuf[0] = address & 0xff;
+ retval = i2c_master_send(id->i2cclient, txbuf, 1);
+
+ if (retval != 1) {
+ dev_err(&id->i2cclient->dev, "%s: Write fail: %d\n",
+ __func__, retval);
+ goto exit;
+ }
+ retval = i2c_master_recv(id->i2cclient, valp, size);
+
+ if (retval != size) {
+ if (++retry_count == 5) {
+ dev_err(&id->i2cclient->dev,
+ "%s: Read of 0x%04x size %d fail: %d\n",
+ __func__, address, size, retval);
+ } else {
+ mdelay(10);
+ rmi_set_page(id, ((address >> 8) & 0xff));
+ goto retry;
+ }
+ } else {
+ retval = 0;
+ }
+exit:
+ mutex_unlock(&page_mutex);
+ return retval;
+}
+
+
+/*
+ * Write a single register through i2c.
+ * You can write multiple registers at once, but I made the functions for that
+ * seperate for performance reasons. Writing multiple requires allocation and
+ * freeing.
+ *
+ * param[in] pd - The pointer to the rmi_phys_driver struct
+ * param[in] address - The address at which to start the write.
+ * param[in] data - The data to be written.
+ * returns one upon success, something else upon error.
+ */
+static int
+rmi_i2c_write(struct rmi_phys_driver *pd, unsigned short address, char data)
+{
+ struct instance_data *id = container_of(pd, struct instance_data, rpd);
+ unsigned char txbuf[2];
+ int retval = 0;
+
+ /* Can't have anyone else changing the page behind our backs */
+ mutex_lock(&page_mutex);
+
+ if (((address >> 8) & 0xff) != id->page) {
+ /* Switch pages */
+ retval = rmi_set_page(id, ((address >> 8) & 0xff));
+ if (retval)
+ goto exit;
+ }
+
+ txbuf[0] = address & 0xff;
+ txbuf[1] = data;
+ retval = i2c_master_send(id->i2cclient, txbuf, 2);
+
+ /* TODO: Add in retry on writes only in certian error return values */
+ if (retval != 2) {
+ dev_err(&id->i2cclient->dev, "%s: Write fail: %d\n",
+ __func__, retval);
+ goto exit; /* Leave this in case we add code below */
+ }
+exit:
+ mutex_unlock(&page_mutex);
+ return retval;
+}
+
+/*
+ * Write multiple registers.
+ *
+ * For fast writes of 16 bytes of less we will re-use a buffer on the stack.
+ * For larger writes (like for RMI reflashing) we will need to allocate a
+ * temp buffer.
+ *
+ * param[in] pd - The pointer to the rmi_phys_driver struct
+ * param[in] address - The address at which to start the write.
+ * param[in] valp - A pointer to a buffer containing the data to be written.
+ * param[in] size - The number of bytes to write.
+ * returns one upon success, something else upon error.
+ */
+static int
+rmi_i2c_write_multiple(struct rmi_phys_driver *pd, unsigned short address,
+ char *valp, int size)
+{
+ struct instance_data *id = container_of(pd, struct instance_data, rpd);
+ unsigned char *txbuf;
+ unsigned char txbuf_most[17]; /* Use this buffer for fast writes of 16
+ bytes or less. The first byte will
+ contain the address at which to start
+ the write. */
+ int retval = 0;
+ int i;
+
+ if (size < sizeof(txbuf_most)) {
+ /* Avoid an allocation if we can help it. */
+ txbuf = txbuf_most;
+ } else {
+ /* over 16 bytes write we'll need to allocate a temp buffer */
+ txbuf = kmalloc(size + 1, GFP_KERNEL);
+ if (!txbuf)
+ return -ENOMEM;
+ }
+
+ /* Yes, it stinks here that we have to copy the buffer */
+ /* We copy from valp to txbuf leaving
+ the first location open for the address */
+ for (i = 0; i < size; i++)
+ txbuf[i + 1] = valp[i];
+
+ /* Can't have anyone else changing the page behind our backs */
+ mutex_lock(&page_mutex);
+
+ if (((address >> 8) & 0xff) != id->page) {
+ /* Switch pages */
+ retval = rmi_set_page(id, ((address >> 8) & 0xff));
+ if (retval)
+ goto exit;
+ }
+
+ txbuf[0] = address & 0xff; /* put the address in the first byte */
+ retval = i2c_master_send(id->i2cclient, txbuf, size + 1);
+
+ /* TODO: Add in retyr on writes only in certian error return values */
+ if (retval != 1) {
+ dev_err(&id->i2cclient->dev, "%s: Write fail: %d\n",
+ __func__, retval);
+ goto exit;
+ }
+exit:
+ mutex_unlock(&page_mutex);
+ if (txbuf != txbuf_most)
+ kfree(txbuf);
+ return retval;
+}
+
+/*
+ * This is the Interrupt Service Routine. It just notifies the application
+ * layer that attention is required.
+ */
+static irqreturn_t
+i2c_attn_isr(int irq, void *info)
+{
+ struct instance_data *id = info;
+ disable_irq(id->irq);
+ if (id->rpd.attention)
+ id->rpd.attention(&id->rpd, id->instance_no);
+ return IRQ_HANDLED;
+}
+
+/* The Driver probe function - will allocate and initialize the instance
+ data and request the irq and set the instance data as the clients
+ platform data then register the physical driver which will do a scan of
+ the RMI4 Physical Device Table and enumerate any RMI4 functions that
+ have data sources associated with them.
+ */
+static int
+rmi_i2c_probe(struct i2c_client *client, const struct i2c_device_id *dev_id)
+{
+ struct instance_data *id;
+ int retval = 0;
+ int i;
+ bool found = false;
+
+ struct rmi_i2c_data *rmii2cdata;
+ struct rmi_i2c_platformdata *platformdata;
+
+ pr_debug("Probing i2c RMI device\n");
+
+ /* Allocate and initialize the instance data for this client */
+ id = kzalloc(sizeof(*id) * 2, GFP_KERNEL);
+ if (!id) {
+ dev_err(&client->dev,
+ "%s: Out of memory trying to allocate instance_data.\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ id->rpd.name = DRIVER_NAME;
+ id->rpd.write = rmi_i2c_write;
+ id->rpd.read = rmi_i2c_read;
+ id->rpd.write_multiple = rmi_i2c_write_multiple;
+ id->rpd.read_multiple = rmi_i2c_read_multiple;
+ id->rpd.module = THIS_MODULE;
+ id->rpd.polling_required = true; /* Set default to polling in case no
+ matching platform data is located
+ for this device. We'll still work
+ but in polling mode since we didn't
+ find any irq info */
+
+ id->page = 0xffff; /* So we set the page correctly
+ the first time */
+
+ /* cast to our struct rmi_i2c_data so we know
+ the fields (see rmi_ic2.h) */
+ rmii2cdata = ((struct rmi_i2c_data *)(client->dev.platform_data));
+
+ /* Loop through the platform data and locate the one that matches
+ the i2c_client I2C address */
+ for (i = 0; i < rmii2cdata->num_clients; i++) {
+ platformdata = &(rmii2cdata->platformdata[i]);
+ if (client->addr == platformdata->i2c_address) {
+ id->instance_no = i;
+ found = true;
+ /* set the device name using the instance_no appended
+ to DEVICE_NAME to make a unique name */
+ dev_set_name(&client->dev,
+ "rmi4-i2c%d", id->instance_no);
+
+ /* Determine if we need to poll (inefficient) or
+ use interrupts.
+ */
+ if (platformdata->irq) {
+ int irqtype;
+
+ id->irq = platformdata->irq;
+ switch (platformdata->irq_type) {
+ case IORESOURCE_IRQ_HIGHEDGE:
+ irqtype = IRQF_TRIGGER_RISING;
+ break;
+ case IORESOURCE_IRQ_LOWEDGE:
+ irqtype = IRQF_TRIGGER_FALLING;
+ break;
+ case IORESOURCE_IRQ_HIGHLEVEL:
+ irqtype = IRQF_TRIGGER_HIGH;
+ break;
+ case IORESOURCE_IRQ_LOWLEVEL:
+ irqtype = IRQF_TRIGGER_LOW;
+ break;
+ default:
+ dev_warn(&client->dev,
+ "%s: Invalid IRQ flags in "
+ "platform data.\n",
+ __func__);
+ kfree(id);
+ return -ENXIO;
+ }
+
+ retval = request_irq(id->irq, i2c_attn_isr,
+ irqtype, "rmi_i2c", id);
+ if (retval) {
+ dev_info(&client->dev,
+ "%s: Unable to get attn irq %d."
+ " Reverting to polling.\n",
+ __func__, id->irq);
+ id->rpd.polling_required = true;
+ } else {
+ dev_dbg(&client->dev,
+ "rmi_i2c_probe: got irq.\n");
+ id->rpd.polling_required = false;
+ id->rpd.irq = id->irq;
+ }
+ } else {
+ id->rpd.polling_required = true;
+ dev_info(&client->dev,
+ "%s: No IRQ info given. "
+ "Polling required.\n",
+ __func__);
+ }
+ }
+ }
+
+ /* if went through all the platform data list and didn't find a match
+ then notify that we are defaulting to polling */
+ if (!found) {
+ dev_info(&client->dev,
+ "%s: No platform data match found. "
+ "Defaulting to use polling.\n",
+ __func__);
+ }
+
+ /* Store the instance data in the i2c_client - we need to do this prior
+ * to calling register_physical_driver since it may use the read, write
+ * functions. If nothing was found then the id fields will be set to 0
+ * for the irq and the default will be set to polling required so we
+ * will still work but in polling mode. */
+ i2c_set_clientdata(client, id);
+
+ /* Copy i2c_client pointer into instance_data's i2c_client pointer for
+ later use in rmi4_read, rmi4_write, etc. */
+ id->i2cclient = client;
+
+ /* Register physical driver - this will call the detect function that
+ will then scan the device and determine the supported RMI4 functions.
+ */
+ retval = rmi_register_phys_driver(&id->rpd);
+ if (retval) {
+ dev_err(&client->dev, "%s: Failed to Register %s phys driver\n",
+ __func__, id->rpd.name);
+ i2c_set_clientdata(client, NULL);
+ /* only free irq if we have an irq - otherwise the instance_data
+ will be 0 for that field since kzalloc was used to alloc id */
+ if (id->irq)
+ free_irq(id->irq, id);
+ kfree(id);
+ return retval;
+ }
+
+ dev_dbg(&client->dev, "%s: Successfully Registered %s phys driver\n",
+ __func__, id->rpd.name);
+
+ return retval;
+}
+
+/* The Driver remove function. We tear down the instance data and unregister
+ * the phys driver in this call.
+ */
+static int
+rmi_i2c_remove(struct i2c_client *client)
+{
+ struct instance_data *id = i2c_get_clientdata(client);
+
+ pr_debug("%s: Unregistering phys driver %s\n", __func__, id->rpd.name);
+
+ rmi_unregister_phys_driver(&id->rpd);
+
+ dev_dbg(&client->dev, "%s: Unregistered phys driver %s\n",
+ __func__, id->rpd.name);
+
+ /* only free irq if we have an irq - otherwise the instance_data
+ will be 0 for that field */
+ if (id->irq)
+ free_irq(id->irq, id);
+
+ kfree(id);
+ dev_dbg(&client->dev, "%s: Remove successful\n", __func__);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int
+rmi_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ /* Touch sleep mode */
+ return 0;
+}
+
+static int
+rmi_i2c_resume(struct i2c_client *client)
+{
+ /* Re-initialize upon resume */
+ return 0;
+}
+#else
+#define rmi_i2c_suspend NULL
+#define rmi_i2c_resume NULL
+#endif
+
+/*
+ * This structure tells the i2c subsystem about us.
+ *
+ * TODO: we should add .suspend and .resume fns.
+ *
+ */
+static struct i2c_driver rmi_i2c_driver = {
+ .probe = rmi_i2c_probe,
+ .remove = rmi_i2c_remove,
+ .suspend = rmi_i2c_suspend,
+ .resume = rmi_i2c_resume,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .id_table = rmi_i2c_id_table,
+};
+
+/*
+ * Register ourselves with i2c Chip Driver.
+ *
+ */
+static int __init rmi_phys_i2c_init(void)
+{
+ return i2c_add_driver(&rmi_i2c_driver);
+}
+
+/*
+ * Un-register ourselves from the i2c Chip Driver.
+ *
+ */
+static void __exit rmi_phys_i2c_exit(void)
+{
+ i2c_del_driver(&rmi_i2c_driver);
+}
+
+
+module_init(rmi_phys_i2c_init);
+module_exit(rmi_phys_i2c_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("RMI4 Driver I2C Physical Layer");
+MODULE_LICENSE("GPL");
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