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authorSander Vermin <sander@vermin.nl>2015-12-01 13:25:05 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2015-12-04 17:12:07 -0800
commitbcf5b3deb0d269a3a28ecf4c73e1c89121ba61d4 (patch)
treeb0d7c88d50196316341fa1a3206e6af56e67f8b4 /drivers/input
parente0361b70175f0cd6199dd9ed6679632de73973d4 (diff)
Input: pixcir_i2c - add support for wake and enable gpios
On some devices the wake and enable pins of the pixcir touchscreen controller are connected to gpios and these must be controlled by the driver for the device to operate properly. Signed-off-by: Sander Vermin <sander@vermin.nl> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/pixcir_i2c_ts.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 4b961ad9f0b5..09523a3d3f23 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -38,6 +38,8 @@ struct pixcir_i2c_ts_data {
struct input_dev *input;
struct gpio_desc *gpio_attb;
struct gpio_desc *gpio_reset;
+ struct gpio_desc *gpio_enable;
+ struct gpio_desc *gpio_wake;
const struct pixcir_i2c_chip_data *chip;
int max_fingers; /* Max fingers supported in this instance */
bool running;
@@ -208,6 +210,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
struct device *dev = &ts->client->dev;
int ret;
+ if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
+ if (ts->gpio_wake)
+ gpiod_set_value_cansleep(ts->gpio_wake, 1);
+ }
+
ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
if (ret < 0) {
dev_err(dev, "%s: can't read reg 0x%x : %d\n",
@@ -228,6 +235,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
return ret;
}
+ if (mode == PIXCIR_POWER_HALT) {
+ if (ts->gpio_wake)
+ gpiod_set_value_cansleep(ts->gpio_wake, 0);
+ }
+
return 0;
}
@@ -302,6 +314,11 @@ static int pixcir_start(struct pixcir_i2c_ts_data *ts)
struct device *dev = &ts->client->dev;
int error;
+ if (ts->gpio_enable) {
+ gpiod_set_value_cansleep(ts->gpio_enable, 1);
+ msleep(100);
+ }
+
/* LEVEL_TOUCH interrupt with active low polarity */
error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
if (error) {
@@ -343,6 +360,9 @@ static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
/* Wait till running ISR is complete */
synchronize_irq(ts->client->irq);
+ if (ts->gpio_enable)
+ gpiod_set_value_cansleep(ts->gpio_enable, 0);
+
return 0;
}
@@ -534,6 +554,27 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
return error;
}
+ tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(tsdata->gpio_wake)) {
+ error = PTR_ERR(tsdata->gpio_wake);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get wake gpio: %d\n", error);
+ return error;
+ }
+
+ tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(tsdata->gpio_enable)) {
+ error = PTR_ERR(tsdata->gpio_enable);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get enable gpio: %d\n", error);
+ return error;
+ }
+
+ if (tsdata->gpio_enable)
+ msleep(100);
+
error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
client->name, tsdata);