Input: edt-ft5x06 - add DT support
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Lothar Waßmann
Dmitry Torokhov
Родитель
1730d81460
Коммит
dac90dc232
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@ -0,0 +1,55 @@
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FocalTech EDT-FT5x06 Polytouch driver
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=====================================
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There are 3 variants of the chip for various touch panel sizes
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FT5206GE1 2.8" .. 3.8"
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FT5306DE4 4.3" .. 7"
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FT5406EE8 7" .. 8.9"
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The software interface is identical for all those chips, so that
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currently there is no need for the driver to distinguish between the
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different chips. Nevertheless distinct compatible strings are used so
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that a distinction can be added if necessary without changing the DT
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bindings.
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Required properties:
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- compatible: "edt,edt-ft5206"
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or: "edt,edt-ft5306"
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or: "edt,edt-ft5406"
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- reg: I2C slave address of the chip (0x38)
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- interrupt-parent: a phandle pointing to the interrupt controller
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serving the interrupt for this chip
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- interrupts: interrupt specification for the touchdetect
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interrupt
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Optional properties:
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- reset-gpios: GPIO specification for the RESET input
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- wake-gpios: GPIO specification for the WAKE input
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- pinctrl-names: should be "default"
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- pinctrl-0: a phandle pointing to the pin settings for the
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control gpios
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- threshold: allows setting the "click"-threshold in the range
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from 20 to 80.
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- gain: allows setting the sensitivity in the range from 0 to
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31. Note that lower values indicate higher
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sensitivity.
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- offset: allows setting the edge compensation in the range from
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0 to 31.
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Example:
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polytouch: edt-ft5x06@38 {
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compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
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reg = <0x38>;
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pinctrl-names = "default";
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pinctrl-0 = <&edt_ft5x06_pins>;
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interrupt-parent = <&gpio2>;
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interrupts = <5 0>;
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reset-gpios = <&gpio2 6 1>;
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wake-gpios = <&gpio4 9 0>;
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};
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@ -1,5 +1,6 @@
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/*
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* Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
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* Lothar Waßmann <LW@KARO-electronics.de> (DT support)
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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@ -33,6 +34,7 @@
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/input/mt.h>
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#include <linux/input/edt-ft5x06.h>
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@ -65,6 +67,10 @@ struct edt_ft5x06_ts_data {
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u16 num_x;
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u16 num_y;
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int reset_pin;
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int irq_pin;
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int wake_pin;
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#if defined(CONFIG_DEBUG_FS)
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struct dentry *debug_dir;
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u8 *raw_buffer;
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@ -614,24 +620,38 @@ edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
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#endif /* CONFIG_DEBUGFS */
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static int edt_ft5x06_ts_reset(struct i2c_client *client,
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int reset_pin)
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struct edt_ft5x06_ts_data *tsdata)
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{
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int error;
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if (gpio_is_valid(reset_pin)) {
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if (gpio_is_valid(tsdata->wake_pin)) {
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error = devm_gpio_request_one(&client->dev,
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tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
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"edt-ft5x06 wake");
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if (error) {
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dev_err(&client->dev,
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"Failed to request GPIO %d as wake pin, error %d\n",
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tsdata->wake_pin, error);
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return error;
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}
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mdelay(5);
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gpio_set_value(tsdata->wake_pin, 1);
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}
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if (gpio_is_valid(tsdata->reset_pin)) {
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/* this pulls reset down, enabling the low active reset */
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error = devm_gpio_request_one(&client->dev, reset_pin,
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GPIOF_OUT_INIT_LOW,
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"edt-ft5x06 reset");
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error = devm_gpio_request_one(&client->dev,
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tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
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"edt-ft5x06 reset");
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if (error) {
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dev_err(&client->dev,
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"Failed to request GPIO %d as reset pin, error %d\n",
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reset_pin, error);
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tsdata->reset_pin, error);
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return error;
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}
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mdelay(50);
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gpio_set_value(reset_pin, 1);
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gpio_set_value(tsdata->reset_pin, 1);
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mdelay(100);
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}
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@ -672,6 +692,20 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
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pdata->name <= edt_ft5x06_attr_##name.limit_high) \
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edt_ft5x06_register_write(tsdata, reg, pdata->name)
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#define EDT_GET_PROP(name, reg) { \
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u32 val; \
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if (of_property_read_u32(np, #name, &val) == 0) \
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edt_ft5x06_register_write(tsdata, reg, val); \
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}
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static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
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struct edt_ft5x06_ts_data *tsdata)
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{
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EDT_GET_PROP(threshold, WORK_REGISTER_THRESHOLD);
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EDT_GET_PROP(gain, WORK_REGISTER_GAIN);
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EDT_GET_PROP(offset, WORK_REGISTER_OFFSET);
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}
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static void
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edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
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const struct edt_ft5x06_platform_data *pdata)
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@ -699,6 +733,30 @@ edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
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tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
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}
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#ifdef CONFIG_OF
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static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
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struct edt_ft5x06_ts_data *tsdata)
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{
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struct device_node *np = dev->of_node;
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/*
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* irq_pin is not needed for DT setup.
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* irq is associated via 'interrupts' property in DT
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*/
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tsdata->irq_pin = -EINVAL;
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tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
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tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
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return 0;
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}
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#else
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static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
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struct edt_ft5x06_ts_data *tsdata)
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{
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return -ENODEV;
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}
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#endif
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static int edt_ft5x06_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -711,32 +769,40 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
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dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
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if (!pdata) {
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dev_err(&client->dev, "no platform data?\n");
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return -EINVAL;
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}
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error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
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if (error)
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return error;
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if (gpio_is_valid(pdata->irq_pin)) {
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error = devm_gpio_request_one(&client->dev, pdata->irq_pin,
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GPIOF_IN, "edt-ft5x06 irq");
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if (error) {
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dev_err(&client->dev,
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"Failed to request GPIO %d, error %d\n",
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pdata->irq_pin, error);
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return error;
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}
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}
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tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
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if (!tsdata) {
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dev_err(&client->dev, "failed to allocate driver data.\n");
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return -ENOMEM;
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}
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if (!pdata) {
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error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
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if (error) {
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dev_err(&client->dev,
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"DT probe failed and no platform data present\n");
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return error;
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}
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} else {
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tsdata->reset_pin = pdata->reset_pin;
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tsdata->irq_pin = pdata->irq_pin;
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tsdata->wake_pin = -EINVAL;
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}
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error = edt_ft5x06_ts_reset(client, tsdata);
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if (error)
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return error;
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if (gpio_is_valid(tsdata->irq_pin)) {
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error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
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GPIOF_IN, "edt-ft5x06 irq");
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if (error) {
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dev_err(&client->dev,
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"Failed to request GPIO %d, error %d\n",
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tsdata->irq_pin, error);
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return error;
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}
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}
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input = devm_input_allocate_device(&client->dev);
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if (!input) {
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dev_err(&client->dev, "failed to allocate input device.\n");
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@ -754,7 +820,11 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
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return error;
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}
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edt_ft5x06_ts_get_defaults(tsdata, pdata);
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if (!pdata)
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edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
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else
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edt_ft5x06_ts_get_defaults(tsdata, pdata);
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edt_ft5x06_ts_get_parameters(tsdata);
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dev_dbg(&client->dev,
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@ -784,10 +854,10 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
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input_set_drvdata(input, tsdata);
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i2c_set_clientdata(client, tsdata);
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, edt_ft5x06_ts_isr,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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client->name, tsdata);
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error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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edt_ft5x06_ts_isr,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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client->name, tsdata);
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if (error) {
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dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
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return error;
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@ -798,19 +868,21 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
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return error;
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error = input_register_device(input);
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if (error) {
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sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
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return error;
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}
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if (error)
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goto err_remove_attrs;
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edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
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device_init_wakeup(&client->dev, 1);
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dev_dbg(&client->dev,
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"EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
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pdata->irq_pin, pdata->reset_pin);
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"EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
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client->irq, tsdata->wake_pin, tsdata->reset_pin);
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return 0;
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err_remove_attrs:
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sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
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return error;
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}
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static int edt_ft5x06_ts_remove(struct i2c_client *client)
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@ -854,10 +926,21 @@ static const struct i2c_device_id edt_ft5x06_ts_id[] = {
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};
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MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
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#ifdef CONFIG_OF
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static const struct of_device_id edt_ft5x06_of_match[] = {
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{ .compatible = "edt,edt-ft5206", },
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{ .compatible = "edt,edt-ft5306", },
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{ .compatible = "edt,edt-ft5406", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
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#endif
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static struct i2c_driver edt_ft5x06_ts_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "edt_ft5x06",
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.of_match_table = of_match_ptr(edt_ft5x06_of_match),
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.pm = &edt_ft5x06_ts_pm_ops,
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},
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.id_table = edt_ft5x06_ts_id,
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