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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>
This commit is contained in:
Hui Wang 2012-10-25 00:38:01 -07:00 committed by Dmitry Torokhov
parent 0cc8d6a9d2
commit ae495e844a
3 changed files with 41 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Documentation/devicetree/bindings/input/touchscreen/egalax-ts.txt Normal file
View File

@ -0,0 +1,19 @@
* EETI eGalax Multiple Touch Controller
Required properties:
- compatible: must be "eeti,egalax_ts"
- reg: i2c slave address
- interrupt-parent: the phandle for the interrupt controller
- interrupts: touch controller interrupt
- wakeup-gpios: the gpio pin to be used for waking up the controller
as well as uased as irq pin
Example:
egalax_ts@04 {
compatible = "eeti,egalax_ts";
reg = <0x04>;
interrupt-parent = <&gpio1>;
interrupts = <9 2>;
wakeup-gpios = <&gpio1 9 0>;
};

2
drivers/input/touchscreen/Kconfig
View File

@ -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.

23
drivers/input/touchscreen/egalax_ts.c
View File

@ -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,