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authorHui Wang <jason77.wang@gmail.com>2012-10-25 00:38:01 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-10-25 00:38:22 -0700
commitae495e844a77344fdaedbb2ad97d925d096e9f0d (patch)
treeb30e1cd487225c3d3316d7b6853b0796e6ad43c3 /drivers/input
parent0cc8d6a9d23d6662da91eeb6bb8e7d1c559850f0 (diff)
Input: egalax_ts - get gpio from devicetree
The irq_to_gpio() is old, most platforms use GENERIC_GPIO framework and don't support this API anymore. The i.MX6q sabrelite platform equips an egalax touchscreen controller, and this platform already transfered to GENERIC_GPIO framework, to support this driver, we use a more generic way to get gpio. Add a return value checking for waking up the controller in the probe function, this guarantee only a workable device can pass init. [dmitry.torokhov@gmail.com: Make driver depend on CONFIG_OF as it is now required.] Acked-by Zhang Jiejing <jiejing.zhang@freescale.com> Reviewed-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Hui Wang <jason77.wang@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/Kconfig2
-rw-r--r--drivers/input/touchscreen/egalax_ts.c23
2 files changed, 22 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 1ba232cbc09d..f7668b24c378 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -239,7 +239,7 @@ config TOUCHSCREEN_EETI
config TOUCHSCREEN_EGALAX
tristate "EETI eGalax multi-touch panel support"
- depends on I2C
+ depends on I2C && OF
help
Say Y here to enable support for I2C connected EETI
eGalax multi-touch panels.
diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
index c1e3460f1195..13fa62fdfb0b 100644
--- a/drivers/input/touchscreen/egalax_ts.c
+++ b/drivers/input/touchscreen/egalax_ts.c
@@ -28,6 +28,7 @@
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/input/mt.h>
+#include <linux/of_gpio.h>
/*
* Mouse Mode: some panel may configure the controller to mouse mode,
@@ -122,9 +123,17 @@ static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
/* wake up controller by an falling edge of interrupt gpio. */
static int egalax_wake_up_device(struct i2c_client *client)
{
- int gpio = irq_to_gpio(client->irq);
+ struct device_node *np = client->dev.of_node;
+ int gpio;
int ret;
+ if (!np)
+ return -ENODEV;
+
+ gpio = of_get_named_gpio(np, "wakeup-gpios", 0);
+ if (!gpio_is_valid(gpio))
+ return -ENODEV;
+
ret = gpio_request(gpio, "egalax_irq");
if (ret < 0) {
dev_err(&client->dev,
@@ -181,7 +190,11 @@ static int __devinit egalax_ts_probe(struct i2c_client *client,
ts->input_dev = input_dev;
/* controller may be in sleep, wake it up. */
- egalax_wake_up_device(client);
+ error = egalax_wake_up_device(client);
+ if (error) {
+ dev_err(&client->dev, "Failed to wake up the controller\n");
+ goto err_free_dev;
+ }
ret = egalax_firmware_version(client);
if (ret < 0) {
@@ -274,11 +287,17 @@ static int egalax_ts_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
+static struct of_device_id egalax_ts_dt_ids[] = {
+ { .compatible = "eeti,egalax_ts" },
+ { /* sentinel */ }
+};
+
static struct i2c_driver egalax_ts_driver = {
.driver = {
.name = "egalax_ts",
.owner = THIS_MODULE,
.pm = &egalax_ts_pm_ops,
+ .of_match_table = of_match_ptr(egalax_ts_dt_ids),
},
.id_table = egalax_ts_id,
.probe = egalax_ts_probe,