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Message-Id: <1389859338-11685-4-git-send-email-LW@KARO-electronics.de>
Date: Thu, 16 Jan 2014 09:02:18 +0100
From: Lothar Waßmann <LW@...O-electronics.de>
To: linux-input@...r.kernel.org,
Simon Budig <simon.budig@...nelconcepts.de>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Rob Landley <rob@...dley.net>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Thierry Reding <thierry.reding@...il.com>,
Grant Likely <grant.likely@...aro.org>,
Jonathan Cameron <jic23@...nel.org>,
Shawn Guo <shawn.guo@...aro.org>,
Silvio F <silvio.fricke@...il.com>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Jingoo Han <jg1.han@...sung.com>,
Fugang Duan <B38611@...escale.com>,
Sachin Kamat <sachin.kamat@...aro.org>,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Lothar Waßmann <LW@...O-electronics.de>
Subject: [PATCHv2 3/3] Input: edt-ft5x06: Add DT support
Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
.../bindings/input/touchscreen/edt-ft5x06.txt | 29 +++++
drivers/input/touchscreen/edt-ft5x06.c | 121 +++++++++++++++++---
2 files changed, 132 insertions(+), 18 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..8d94cdc
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
@@ -0,0 +1,29 @@
+* EDT FT5x06 Multiple Touch Controller
+
+Required properties:
+- compatible: must be "edt,ft5x06"
+- reg: i2c slave address
+- interrupt-parent: the phandle for the interrupt controller
+- interrupts: touch controller interrupt
+
+Optional properties:
+- reset-gpios: the gpio pin to be used for resetting the controller
+- wake-gpios: the gpio pin to be used for waking up the controller
+
+ The following properties provide default values for the
+ corresponding parameters (see Documentation/input/edt-ft5x06.txt)
+- edt,threshold: allows setting the "click"-threshold in the range from 20 to 80.
+- edt,gain: sensitivity (0..31) (lower value -> higher sensitivity)
+- edt,offset: edge compensation (0..31)
+- edt,report-rate: report rate (3..14)
+
+Example:
+
+ edt_ft5x06@38 {
+ compatible = "edt,ft5x06";
+ reg = <0x38>;
+ 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 acb6b9f..0467591 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -33,6 +33,7 @@
#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 +66,10 @@ 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;
@@ -617,25 +622,38 @@ edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
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,
+ 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);
- mdelay(100);
+ mdelay(5);
+ gpio_set_value(tsdata->reset_pin, 1);
+ mdelay(300);
}
return 0;
@@ -675,6 +693,29 @@ 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, var, reg) { \
+ u32 val; \
+ if (of_property_read_u32(np, name, &val) == 0) { \
+ if (val >= edt_ft5x06_attr_##var.limit_low && \
+ val <= edt_ft5x06_attr_##var.limit_high) \
+ edt_ft5x06_register_write(tsdata, reg, val); \
+ else \
+ pr_err("edt_ft5x06: property %s (%u) is out of range: %u..%u", \
+ name, val, edt_ft5x06_attr_##var.limit_low, \
+ edt_ft5x06_attr_##var.limit_high); \
+ } \
+}
+
+static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
+ struct edt_ft5x06_ts_data *tsdata)
+{
+ /* pick up defaults from the DT data */
+ EDT_GET_PROP("edt,threshold", threshold, WORK_REGISTER_THRESHOLD);
+ EDT_GET_PROP("edt,gain", gain, WORK_REGISTER_GAIN);
+ EDT_GET_PROP("edt,offset", offset, WORK_REGISTER_OFFSET);
+ EDT_GET_PROP("edt,report-rate", report_rate, WORK_REGISTER_REPORT_RATE);
+}
+
static void
edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
const struct edt_ft5x06_platform_data *pdata)
@@ -702,6 +743,33 @@ 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;
+
+ if (!np)
+ return -ENODEV;
+
+ /*
+ * 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)
{
@@ -714,27 +782,40 @@ 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 = kzalloc(sizeof(*tsdata), GFP_KERNEL);
input = devm_input_allocate_device(&client->dev);
if (!input) {
dev_err(&client->dev, "failed to allocate input device.\n");
@@ -752,7 +833,11 @@ 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,
@@ -805,8 +890,8 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
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;
}
--
1.7.2.5
--
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