From: Lyude Paul <thatslyude@xxxxxxxxx>
This adds basic functionality for PS/2 passthrough on Synaptics
Touchpads using RMI4 through smbus.
Reviewed-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
Signed-off-by: Lyude Paul <thatslyude@xxxxxxxxx>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
changes in v2:
- amended according to Dmitry's suggestions
- add a depend on SERIO in the Kconfig
---
drivers/input/rmi4/Kconfig | 9 ++
drivers/input/rmi4/Makefile | 1 +
drivers/input/rmi4/rmi_bus.c | 3 +
drivers/input/rmi4/rmi_driver.h | 1 +
drivers/input/rmi4/rmi_f03.c | 233 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 247 insertions(+)
create mode 100644 drivers/input/rmi4/rmi_f03.c
diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
index a9c36a5..30cc627 100644
--- a/drivers/input/rmi4/Kconfig
+++ b/drivers/input/rmi4/Kconfig
@@ -39,6 +39,15 @@ config RMI4_SMB
To compile this driver as a module, choose M here: the module will be
called rmi_smbus.
+config RMI4_F03
+ bool "RMI4 Function 03 (PS2 Guest)"
+ depends on RMI4_CORE && SERIO
+ help
+ Say Y here if you want to add support for RMI4 function 03.
+
+ Function 03 provides PS2 guest support for RMI4 devices. This
+ includes support for TrackPoints on TouchPads.
+
config RMI4_2D_SENSOR
bool
depends on RMI4_CORE
diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile
index e7f4ca6..a199cbe 100644
--- a/drivers/input/rmi4/Makefile
+++ b/drivers/input/rmi4/Makefile
@@ -4,6 +4,7 @@ rmi_core-y := rmi_bus.o rmi_driver.o rmi_f01.o
rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
# Function drivers
+rmi_core-$(CONFIG_RMI4_F03) += rmi_f03.o
rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
index 81be9c1..1c40d94 100644
--- a/drivers/input/rmi4/rmi_bus.c
+++ b/drivers/input/rmi4/rmi_bus.c
@@ -305,6 +305,9 @@ struct bus_type rmi_bus_type = {
static struct rmi_function_handler *fn_handlers[] = {
&rmi_f01_handler,
+#ifdef CONFIG_RMI4_F03
+ &rmi_f03_handler,
+#endif
#ifdef CONFIG_RMI4_F11
&rmi_f11_handler,
#endif
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index cc94585..24f8f76 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -121,6 +121,7 @@ static inline void rmi_f34_remove_sysfs(struct rmi_device *rmi_dev)
#endif /* CONFIG_RMI_F34 */
extern struct rmi_function_handler rmi_f01_handler;
+extern struct rmi_function_handler rmi_f03_handler;
extern struct rmi_function_handler rmi_f11_handler;
extern struct rmi_function_handler rmi_f12_handler;
extern struct rmi_function_handler rmi_f30_handler;
diff --git a/drivers/input/rmi4/rmi_f03.c b/drivers/input/rmi4/rmi_f03.c
new file mode 100644
index 0000000..fd8f6e5
--- /dev/null
+++ b/drivers/input/rmi4/rmi_f03.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2015-2016 Red Hat
+ * Copyright (C) 2015 Lyude Paul <thatslyude@xxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/serio.h>
+#include <linux/notifier.h>
+#include "rmi_driver.h"
+
+#define RMI_F03_RX_DATA_OFB 0x01
+#define RMI_F03_OB_SIZE 2
+
+#define RMI_F03_OB_OFFSET 2
+#define RMI_F03_OB_DATA_OFFSET 1
+#define RMI_F03_OB_FLAG_TIMEOUT BIT(6)
+#define RMI_F03_OB_FLAG_PARITY BIT(7)
+
+#define RMI_F03_DEVICE_COUNT 0x07
+#define RMI_F03_BYTES_PER_DEVICE_MASK 0x70
+#define RMI_F03_BYTES_PER_DEVICE_SHIFT 4
+#define RMI_F03_QUEUE_LENGTH 0x0F
+
+struct f03_data {
+ struct rmi_function *fn;
+
+ struct serio *serio;
+
+ u8 device_count;
+ u8 rx_queue_length;
+};
+
+static int rmi_f03_pt_write(struct serio *id, unsigned char val)
+{
+ struct f03_data *f03 = id->port_data;
+ int error;
+
+ rmi_dbg(RMI_DEBUG_FN, &f03->fn->dev,
+ "%s: Wrote %.2hhx to PS/2 passthrough address",
+ __func__, val);
+
+ error = rmi_write(f03->fn->rmi_dev, f03->fn->fd.data_base_addr, val);
+ if (error) {
+ dev_err(&f03->fn->dev,
+ "%s: Failed to write to F03 TX register (%d).\n",
+ __func__, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int rmi_f03_initialize(struct f03_data *f03)
+{
+ struct rmi_function *fn = f03->fn;
+ struct device *dev = &fn->dev;
+ int error;
+ u8 bytes_per_device;
+ u8 query1;
+ size_t query2_len;
+
+ error = rmi_read(fn->rmi_dev, fn->fd.query_base_addr, &query1);
+ if (error) {
+ dev_err(dev, "Failed to read query register (%d).\n", error);
+ return error;
+ }
+
+ f03->device_count = query1 & RMI_F03_DEVICE_COUNT;
+ bytes_per_device = (query1 & RMI_F03_BYTES_PER_DEVICE_MASK) >>
+ RMI_F03_BYTES_PER_DEVICE_SHIFT;
+
+ query2_len = f03->device_count * bytes_per_device;
+
+ /*
+ * The first generation of image sensors don't have a second part to
+ * their f03 query, as such we have to set some of these values manually
+ */
+ if (query2_len < 1) {
+ f03->device_count = 1;
+ f03->rx_queue_length = 7;
+ } else {
+ u8 query2[query2_len];
+
+ error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr + 1,
+ query2, query2_len);
+ if (error) {
+ dev_err(dev,
+ "Failed to read second set of query registers (%d).\n",
+ error);
+ return error;
+ }
+
+ f03->rx_queue_length = query2[0] & RMI_F03_QUEUE_LENGTH;
+ }
+
+ return 0;
+}
+
+static int rmi_f03_register_pt(struct rmi_function *fn)
+{
+ struct f03_data *f03 = dev_get_drvdata(&fn->dev);
+ struct serio *serio;
+
+ serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+ if (!serio)
+ return -ENOMEM;
+
+ serio->id.type = SERIO_8042;
+ serio->write = rmi_f03_pt_write;
+ serio->port_data = f03;
+
+ strlcpy(serio->name, "Synaptics RMI4 PS2 pass-through",
+ sizeof(serio->name));
+ strlcpy(serio->phys, "synaptics-rmi4-pt/serio1",
+ sizeof(serio->phys));
+ serio->dev.parent = &fn->dev;
+
+ f03->serio = serio;
+
+ serio_register_port(serio);
+
+ return 0;
+}
+
+static int rmi_f03_probe(struct rmi_function *fn)
+{
+ struct device *dev = &fn->dev;
+ struct f03_data *f03;
+ int error;
+
+ f03 = devm_kzalloc(dev, sizeof(struct f03_data), GFP_KERNEL);
+ if (!f03)
+ return -ENOMEM;
+
+ f03->fn = fn;
+
+ error = rmi_f03_initialize(f03);
+ if (error < 0)
+ return error;
+
+ dev_set_drvdata(dev, f03);
+
+ if (f03->device_count != 1)
+ dev_warn(dev, "found %d devices on PS/2 passthrough",
+ f03->device_count);
+
+ error = rmi_f03_register_pt(fn);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static int rmi_f03_config(struct rmi_function *fn)
+{
+ fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask);
+
+ return 0;
+}
+
+static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
+{
+ struct f03_data *f03 = dev_get_drvdata(&fn->dev);
+ u16 data_addr = fn->fd.data_base_addr;
+ const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
+ u8 obs[ob_len];
+ u8 ob_status;
+ u8 ob_data;
+ unsigned int serio_flags;
+ int i;
+ int retval;
+
+ /* Grab all of the data registers, and check them for data */
+ retval = rmi_read_block(fn->rmi_dev, data_addr + RMI_F03_OB_OFFSET,
+ &obs, ob_len);
+ if (retval) {
+ dev_err(&fn->dev, "%s: Failed to read F03 output buffers.\n",
+ __func__);
+ serio_interrupt(f03->serio, 0, SERIO_TIMEOUT);
+ return retval;
+ }
+
+ for (i = 0; i < ob_len; i += RMI_F03_OB_SIZE) {
+ ob_status = obs[i];
+ ob_data = obs[i + RMI_F03_OB_DATA_OFFSET];
+ serio_flags = 0;
+
+ if (!(ob_status & RMI_F03_RX_DATA_OFB))
+ continue;
+
+ if (ob_status & RMI_F03_OB_FLAG_TIMEOUT)
+ serio_flags |= SERIO_TIMEOUT;
+ if (ob_status & RMI_F03_OB_FLAG_PARITY)
+ serio_flags |= SERIO_PARITY;
+
+ rmi_dbg(RMI_DEBUG_FN, &fn->dev,
+ "%s: Received %.2hhx from PS2 guest T: %c P: %c\n",
+ __func__, ob_data,
+ serio_flags & SERIO_TIMEOUT ? 'Y' : 'N',
+ serio_flags & SERIO_PARITY ? 'Y' : 'N');
+
+ serio_interrupt(f03->serio, ob_data, serio_flags);
+ }
+
+ return 0;
+}
+
+static void rmi_f03_remove(struct rmi_function *fn)
+{
+ struct f03_data *f03 = dev_get_drvdata(&fn->dev);
+
+ serio_unregister_port(f03->serio);
+}
+
+struct rmi_function_handler rmi_f03_handler = {
+ .driver = {
+ .name = "rmi4_f03",
+ },
+ .func = 0x03,
+ .probe = rmi_f03_probe,
+ .config = rmi_f03_config,
+ .attention = rmi_f03_attention,
+ .remove = rmi_f03_remove,
+};
+
+MODULE_AUTHOR("Lyude Paul <thatslyude@xxxxxxxxx>");
+MODULE_DESCRIPTION("RMI F03 module");
+MODULE_LICENSE("GPL");
--
2.9.3
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