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| author | Lee Jones <lee.jones@linaro.org> | 2012-09-28 15:35:43 +0200 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-11-28 08:05:19 +0100 |
| commit | 48fceb7d37cde11edf342c5095fa8815365c299f (patch) | |
| tree | 97da5a94b9612da5c20a3e0d5432e8f04caebcc6 /drivers/input/touchscreen/bu21013_ts.c | |
| parent | Input: bu21013_ts - move GPIO init and exit functions into the driver (diff) | |
| download | linux-48fceb7d37cde11edf342c5095fa8815365c299f.tar.xz linux-48fceb7d37cde11edf342c5095fa8815365c299f.zip | |
Input: bu21013_ts - add support for Device Tree booting
Now we can register the BU21013_ts touch screen when booting with Device
Tree enabled. Here we parse all the necessary components previously
expected to be passed from platform data.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen/bu21013_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/bu21013_ts.c | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c index c6f6a04ec673..b9b5ddad6658 100644 --- a/drivers/input/touchscreen/bu21013_ts.c +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -15,6 +15,8 @@ #include <linux/regulator/consumer.h> #include <linux/module.h> #include <linux/gpio.h> +#include <linux/of.h> +#include <linux/of_gpio.h> #define PEN_DOWN_INTR 0 #define MAX_FINGERS 2 @@ -445,6 +447,45 @@ static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data) gpio_free(bu21013_data->chip->cs_pin); } +#ifdef CONFIG_OF +static const struct bu21013_platform_device * +bu21013_parse_dt(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct bu21013_platform_device *pdata; + + if (!np) { + dev_err(dev, "no device tree or platform data\n"); + return ERR_PTR(-EINVAL); + } + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->y_flip = pdata->x_flip = false; + + pdata->x_flip = of_property_read_bool(np, "rohm,flip-x"); + pdata->y_flip = of_property_read_bool(np, "rohm,flip-y"); + + of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max); + of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max); + + pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0); + pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0); + + pdata->ext_clk = false; + + return pdata; +} +#else +static inline const struct bu21013_platform_device * +bu21013_parse_dt(struct device *dev) +{ + dev_err(dev, "no platform data available\n"); + return ERR_PTR(-EINVAL); +} +#endif /** * bu21013_probe() - initializes the i2c-client touchscreen driver @@ -457,10 +498,10 @@ static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data) static int bu21013_probe(struct i2c_client *client, const struct i2c_device_id *id) { + const struct bu21013_platform_device *pdata = + dev_get_platdata(&client->dev); struct bu21013_ts_data *bu21013_data; struct input_dev *in_dev; - const struct bu21013_platform_device *pdata = - client->dev.platform_data; int error; if (!i2c_check_functionality(client->adapter, @@ -470,8 +511,9 @@ static int bu21013_probe(struct i2c_client *client, } if (!pdata) { - dev_err(&client->dev, "platform data not defined\n"); - return -EINVAL; + pdata = bu21013_parse_dt(&client->dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); } if (!gpio_is_valid(pdata->touch_pin)) { |