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Subject[PATCHv5 2/5] Input: edt-ft5x06: Add DT support
Date

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
---
.../bindings/input/touchscreen/edt-ft5x06.txt | 55 ++++++++
drivers/input/touchscreen/edt-ft5x06.c | 143 +++++++++++++++-----
2 files changed, 167 insertions(+), 31 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt

diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
new file mode 100644
index 0000000..76db967
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
@@ -0,0 +1,55 @@
+FocalTech EDT-FT5x06 Polytouch driver
+=====================================
+
+There are 3 variants of the chip for various touch panel sizes
+FT5206GE1 2.8" .. 3.8"
+FT5306DE4 4.3" .. 7"
+FT5406EE8 7" .. 8.9"
+
+The software interface is identical for all those chips, so that
+currently there is no need for the driver to distinguish between the
+different chips. Nevertheless distinct compatible strings are used so
+that a distinction can be added if necessary without changing the DT
+bindings.
+
+
+Required properties:
+ - compatible: "edt,edt-ft5206"
+ or: "edt,edt-ft5306"
+ or: "edt,edt-ft5406"
+
+ - reg: I2C slave address of the chip (0x38)
+ - interrupt-parent: a phandle pointing to the interrupt controller
+ serving the interrupt for this chip
+ - interrupts: interrupt specification for the touchdetect
+ interrupt
+
+Optional properties:
+ - reset-gpios: GPIO specification for the RESET input
+ - wake-gpios: GPIO specification for the WAKE input
+
+ - pinctrl-names: should be "default"
+ - pinctrl-0: a phandle pointing to the pin settings for the
+ control gpios
+
+ - threshold: allows setting the "click"-threshold in the range
+ from 20 to 80.
+
+ - gain: allows setting the sensitivity in the range from 0 to
+ 31. Note that lower values indicate higher
+ sensitivity.
+
+ - offset: allows setting the edge compensation in the range from
+ 0 to 31.
+
+Example:
+ polytouch: edt-ft5x06@38 {
+ compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
+ reg = <0x38>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&edt_ft5x06_pins>;
+ interrupt-parent = <&gpio2>;
+ interrupts = <5 0>;
+ reset-gpios = <&gpio2 6 1>;
+ wake-gpios = <&gpio4 9 0>;
+ };
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 155ab3b..03dab2f 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
+ * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@@ -33,6 +34,7 @@
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/input/mt.h>
#include <linux/input/edt-ft5x06.h>

@@ -65,6 +67,10 @@ struct edt_ft5x06_ts_data {
u16 num_x;
u16 num_y;

+ int reset_pin;
+ int irq_pin;
+ int wake_pin;
+
#if defined(CONFIG_DEBUG_FS)
struct dentry *debug_dir;
u8 *raw_buffer;
@@ -614,24 +620,38 @@ edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
#endif /* CONFIG_DEBUGFS */

static int edt_ft5x06_ts_reset(struct i2c_client *client,
- int reset_pin)
+ struct edt_ft5x06_ts_data *tsdata)
{
int error;

- if (gpio_is_valid(reset_pin)) {
+ if (gpio_is_valid(tsdata->wake_pin)) {
+ error = devm_gpio_request_one(&client->dev,
+ tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
+ "edt-ft5x06 wake");
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d as wake pin, error %d\n",
+ tsdata->wake_pin, error);
+ return error;
+ }
+
+ mdelay(5);
+ gpio_set_value(tsdata->wake_pin, 1);
+ }
+ if (gpio_is_valid(tsdata->reset_pin)) {
/* this pulls reset down, enabling the low active reset */
- error = devm_gpio_request_one(&client->dev, reset_pin,
- GPIOF_OUT_INIT_LOW,
- "edt-ft5x06 reset");
+ error = devm_gpio_request_one(&client->dev,
+ tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
+ "edt-ft5x06 reset");
if (error) {
dev_err(&client->dev,
"Failed to request GPIO %d as reset pin, error %d\n",
- reset_pin, error);
+ tsdata->reset_pin, error);
return error;
}

mdelay(50);
- gpio_set_value(reset_pin, 1);
+ gpio_set_value(tsdata->reset_pin, 1);
mdelay(100);
}

@@ -672,6 +692,20 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
pdata->name <= edt_ft5x06_attr_##name.limit_high) \
edt_ft5x06_register_write(tsdata, reg, pdata->name)

+#define EDT_GET_PROP(name, reg) { \
+ u32 val; \
+ if (of_property_read_u32(np, #name, val) == 0) \
+ edt_ft5x06_register_write(tsdata, reg, val); \
+}
+
+static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ EDT_GET_PROP(threshold, WORK_REGISTER_THRESHOLD);
+ EDT_GET_PROP(gain, WORK_REGISTER_GAIN);
+ EDT_GET_PROP(offset, WORK_REGISTER_OFFSET);
+}
+
static void
edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
const struct edt_ft5x06_platform_data *pdata)
@@ -699,6 +733,30 @@ edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
}

+#ifdef CONFIG_OF
+static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ struct device_node *np = dev->of_node;
+
+ /*
+ * irq_pin is not needed for DT setup.
+ * irq is associated via 'interrupts' property in DT
+ */
+ tsdata->irq_pin = -EINVAL;
+ tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
+ tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
+
+ return 0;
+}
+#else
+static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+ struct edt_ft5x06_i2c_ts_data *tsdata)
+{
+ return -ENODEV;
+}
+#endif
+
static int edt_ft5x06_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -711,32 +769,40 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,

dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");

+ tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
+ if (!tsdata) {
+ dev_err(&client->dev, "failed to allocate driver data.\n");
+ return -ENOMEM;
+ }
+
if (!pdata) {
- dev_err(&client->dev, "no platform data?\n");
- return -EINVAL;
+ error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
+ if (error) {
+ dev_err(&client->dev,
+ "DT probe failed and no platform data present\n");
+ return error;
+ }
+ } else {
+ tsdata->reset_pin = pdata->reset_pin;
+ tsdata->irq_pin = pdata->irq_pin;
+ tsdata->wake_pin = -EINVAL;
}

- error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
+ error = edt_ft5x06_ts_reset(client, tsdata);
if (error)
return error;

- if (gpio_is_valid(pdata->irq_pin)) {
- error = devm_gpio_request_one(&client->dev, pdata->irq_pin,
- GPIOF_IN, "edt-ft5x06 irq");
+ if (gpio_is_valid(tsdata->irq_pin)) {
+ error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
+ GPIOF_IN, "edt-ft5x06 irq");
if (error) {
dev_err(&client->dev,
"Failed to request GPIO %d, error %d\n",
- pdata->irq_pin, error);
+ tsdata->irq_pin, error);
return error;
}
}

- tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
- if (!tsdata) {
- dev_err(&client->dev, "failed to allocate driver data.\n");
- return -ENOMEM;
- }
-
input = devm_input_allocate_device(&client->dev);
if (!input) {
dev_err(&client->dev, "failed to allocate input device.\n");
@@ -754,7 +820,11 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
return error;
}

- edt_ft5x06_ts_get_defaults(tsdata, pdata);
+ if (!pdata)
+ edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
+ else
+ edt_ft5x06_ts_get_defaults(tsdata, pdata);
+
edt_ft5x06_ts_get_parameters(tsdata);

dev_dbg(&client->dev,
@@ -784,10 +854,10 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
input_set_drvdata(input, tsdata);
i2c_set_clientdata(client, tsdata);

- error = devm_request_threaded_irq(&client->dev, client->irq,
- NULL, edt_ft5x06_ts_isr,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- client->name, tsdata);
+ error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ edt_ft5x06_ts_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ client->name, tsdata);
if (error) {
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
return error;
@@ -798,19 +868,21 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
return error;

error = input_register_device(input);
- if (error) {
- sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
- return error;
- }
+ if (error)
+ goto err_remove_attrs;

edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
device_init_wakeup(&client->dev, 1);

dev_dbg(&client->dev,
- "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
- pdata->irq_pin, pdata->reset_pin);
+ "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
+ client->irq, tsdata->wake_pin, tsdata->reset_pin);

return 0;
+
+err_remove_attrs:
+ sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+ return error;
}

static int edt_ft5x06_ts_remove(struct i2c_client *client)
@@ -854,10 +926,19 @@ static const struct i2c_device_id edt_ft5x06_ts_id[] = {
};
MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);

+static const struct of_device_id edt_ft5x06_of_match[] = {
+ { .compatible = "edt,edt-ft5206", },
+ { .compatible = "edt,edt-ft5306", },
+ { .compatible = "edt,edt-ft5406", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
+
static struct i2c_driver edt_ft5x06_ts_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "edt_ft5x06",
+ .of_match_table = edt_ft5x06_of_match,
.pm = &edt_ft5x06_ts_pm_ops,
},
.id_table = edt_ft5x06_ts_id,
--
1.7.10.4
--
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