The icn8505 variant found on some x86 tablets has almost the same protocol
as the 8318, protocol wise there are only a few small differences:
1) The 8505 uses 16 bit register addresses and has a different register
address for the location of the touch data.
2) The 8505 coordinates are in little-endian format instead of in be.
3) The 8505 allows reading the resolution back from the controller
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Changes in v2:
-Read resolution directly from the controller
Changes in v3:
-Make x/y touch_data members u8 arrays instead of __be16 with a force-cast
to __le16 for the icn8505 case
-Add a coord_to_cpu function pointer to struct icn8318_data, instead
of doing a data->model check
---
.../bindings/input/touchscreen/chipone_icn8318.txt | 2 +-
drivers/input/touchscreen/Kconfig | 3 +-
drivers/input/touchscreen/chipone_icn8318.c | 91 ++++++++++++++++++----
3 files changed, 77 insertions(+), 19 deletions(-)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/chipone_icn8318.txt b/Documentation/devicetree/bindings/input/touchscreen/chipone_icn8318.txt
index d11f8d615b5d..9fdd80749386 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/chipone_icn8318.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/chipone_icn8318.txt
@@ -1,7 +1,7 @@
* ChipOne icn8318 I2C touchscreen controller
Required properties:
- - compatible : "chipone,icn8318"
+ - compatible : "chipone,icn8318" or "chipone,icn8505"
- reg : I2C slave address of the chip (0x40)
- interrupt-parent : a phandle pointing to the interrupt controller
serving the interrupt for this chip
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index cf26ca49ae6d..fff1467506e7 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -157,7 +157,8 @@ config TOUCHSCREEN_CHIPONE_ICN8318
depends on I2C
depends on OF
help
- Say Y here if you have a ChipOne icn8318 based I2C touchscreen.
+ Say Y here if you have a ChipOne icn8318 or icn8505 based
+ I2C touchscreen.
If unsure, say N.
diff --git a/drivers/input/touchscreen/chipone_icn8318.c b/drivers/input/touchscreen/chipone_icn8318.c
index 27df6ca3a8a3..eba2f7eb3c3a 100644
--- a/drivers/input/touchscreen/chipone_icn8318.c
+++ b/drivers/input/touchscreen/chipone_icn8318.c
@@ -1,7 +1,7 @@
/*
* Driver for ChipOne icn8318 i2c touchscreen controller
*
- * Copyright (c) 2015 Red Hat Inc.
+ * Copyright (c) 2015-2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -12,6 +12,7 @@
* Hans de Goede <hdegoede@xxxxxxxxxx>
*/
+#include <asm/unaligned.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
@@ -20,6 +21,7 @@
#include <linux/input/touchscreen.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#define ICN8318_REG_POWER 4
#define ICN8318_REG_TOUCHDATA 16
@@ -30,10 +32,18 @@
#define ICN8318_MAX_TOUCHES 5
+#define ICN8505_REG_TOUCHDATA 0x1000
+#define ICN8505_REG_CONFIGDATA 0x8000
+
+enum icn8318_model {
+ ICN8318,
+ ICN8505,
+};
+
struct icn8318_touch {
__u8 slot;
- __be16 x;
- __be16 y;
+ __u8 x[2];
+ __u8 y[2];
__u8 pressure; /* Seems more like finger width then pressure really */
__u8 event;
/* The difference between 2 and 3 is unclear */
@@ -54,27 +64,48 @@ struct icn8318_data {
struct input_dev *input;
struct gpio_desc *wake_gpio;
struct touchscreen_properties prop;
+ enum icn8318_model model;
+ int touchdata_reg;
+ u16 (*coord_to_cpu)(const u8 *buf);
};
-static int icn8318_read_touch_data(struct i2c_client *client,
- struct icn8318_touch_data *touch_data)
+static int icn8318_read_data(struct icn8318_data *data, int reg,
+ void *buf, int len)
{
- u8 reg = ICN8318_REG_TOUCHDATA;
+ u8 addr[2];
struct i2c_msg msg[2] = {
{
- .addr = client->addr,
- .len = 1,
- .buf = ®
+ .addr = data->client->addr,
+ .buf = addr
},
{
- .addr = client->addr,
+ .addr = data->client->addr,
.flags = I2C_M_RD,
- .len = sizeof(struct icn8318_touch_data),
- .buf = (u8 *)touch_data
+ .len = len,
+ .buf = buf
}
};
- return i2c_transfer(client->adapter, msg, 2);
+ if (data->model == ICN8318) {
+ addr[0] = reg;
+ msg[0].len = 1;
+ } else {
+ addr[0] = reg >> 8;
+ addr[1] = reg & 0xff;
+ msg[0].len = 2;
+ }
+
+ return i2c_transfer(data->client->adapter, msg, 2);
+}
+
+static u16 icn8318_coord_to_cpu(const u8 *buf)
+{
+ return get_unaligned_be16(buf);
+}
+
+static u16 icn8505_coord_to_cpu(const u8 *buf)
+{
+ return get_unaligned_le16(buf);
}
static inline bool icn8318_touch_active(u8 event)
@@ -90,7 +121,8 @@ static irqreturn_t icn8318_irq(int irq, void *dev_id)
struct icn8318_touch_data touch_data;
int i, ret;
- ret = icn8318_read_touch_data(data->client, &touch_data);
+ ret = icn8318_read_data(data, data->touchdata_reg,
+ &touch_data, sizeof(touch_data));
if (ret < 0) {
dev_err(dev, "Error reading touch data: %d\n", ret);
return IRQ_HANDLED;
@@ -122,8 +154,9 @@ static irqreturn_t icn8318_irq(int irq, void *dev_id)
continue;
touchscreen_report_pos(data->input, &data->prop,
- be16_to_cpu(touch->x),
- be16_to_cpu(touch->y), true);
+ data->coord_to_cpu(touch->x),
+ data->coord_to_cpu(touch->y),
+ true);
}
input_mt_sync_frame(data->input);
@@ -188,6 +221,7 @@ static int icn8318_probe(struct i2c_client *client,
struct device *dev = &client->dev;
struct icn8318_data *data;
struct input_dev *input;
+ __le16 resolution[2];
int error;
if (!client->irq) {
@@ -220,6 +254,28 @@ static int icn8318_probe(struct i2c_client *client,
input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
+ data->model = (long)of_device_get_match_data(dev);
+
+ if (data->model == ICN8318) {
+ data->touchdata_reg = ICN8318_REG_TOUCHDATA;
+ data->coord_to_cpu = icn8318_coord_to_cpu;
+ } else {
+ data->touchdata_reg = ICN8505_REG_TOUCHDATA;
+ data->coord_to_cpu = icn8505_coord_to_cpu;
+
+ error = icn8318_read_data(data, ICN8505_REG_CONFIGDATA,
+ resolution, sizeof(resolution));
+ if (error < 0) {
+ dev_err(dev, "Error reading resolution: %d\n", error);
+ return error;
+ }
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
+ le16_to_cpu(resolution[0]) - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
+ le16_to_cpu(resolution[1]) - 1, 0, 0);
+ }
+
touchscreen_parse_properties(input, true, &data->prop);
if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
@@ -256,7 +312,8 @@ static int icn8318_probe(struct i2c_client *client,
}
static const struct of_device_id icn8318_of_match[] = {
- { .compatible = "chipone,icn8318" },
+ { .compatible = "chipone,icn8318", .data = (void *)ICN8318 },
+ { .compatible = "chipone,icn8505", .data = (void *)ICN8505 },
{ }
};
MODULE_DEVICE_TABLE(of, icn8318_of_match);
--
2.13.0
--
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