From 48fceb7d37cde11edf342c5095fa8815365c299f Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Fri, 28 Sep 2012 14:35:43 +0100 Subject: [PATCH] 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 Acked-by: Linus Walleij Signed-off-by: Lee Jones Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/bu21013_ts.c | 50 +++++++++++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c index c6f6a04..b9b5dda 100644 --- a/drivers/input/touchscreen/bu21013_ts.c +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -15,6 +15,8 @@ #include #include #include +#include +#include #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)) { -- 2.7.4