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Input: pixcir_i2c_ts - add RESET gpio

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The controller has a RESET pin which is usually controlled over
a GPIO line. If such a GPIO is provided, perform a RESET
during probe.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Roger Quadros 2015-07-06 13:27:43 -07:00 committed by Dmitry Torokhov
parent 127520caeb
commit 40929167e6
2 changed files with 25 additions and 0 deletions
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3
Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
View file

@ -8,6 +8,9 @@ Required properties:
- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
Optional properties:
- reset-gpio: GPIO connected to the RESET line of the chip
Example:
i2c@00000000 {

22
drivers/input/touchscreen/pixcir_i2c_ts.c
View file

@ -36,6 +36,7 @@ struct pixcir_i2c_ts_data {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *gpio_attb;
struct gpio_desc *gpio_reset;
const struct pixcir_ts_platform_data *pdata;
bool running;
int max_fingers; /* Max fingers supported in this instance */
@ -189,6 +190,17 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
{
if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
/* wait for controller ready. 100ms guess. */
msleep(100);
}
}
static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
enum pixcir_power_mode mode)
{
@ -529,6 +541,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
return error;
}
tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(tsdata->gpio_reset)) {
error = PTR_ERR(tsdata->gpio_reset);
dev_err(dev, "Failed to request RESET gpio: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
client->name, tsdata);
@ -537,6 +557,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
return error;
}
pixcir_reset(tsdata);
/* Always be in IDLE mode to save power, device supports auto wake */
error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
if (error) {