Input: edt-ft5x06 - add DT support

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 114 insertions, 31 deletions

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 155ab3ba84ee..9d61f1e36b33 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_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 +926,21 @@ static const struct i2c_device_id edt_ft5x06_ts_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
 
+#ifdef CONFIG_OF
+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);
+#endif
+
 static struct i2c_driver edt_ft5x06_ts_driver = {
         .driver = {
                 .owner = THIS_MODULE,
                 .name = "edt_ft5x06",
+                .of_match_table = of_match_ptr(edt_ft5x06_of_match),
                 .pm = &edt_ft5x06_ts_pm_ops,
         },
         .id_table = edt_ft5x06_ts_id,