From: Heiko Stuebner <[email protected]> It's possible that the controller has an individually switchable power supply. Therefore add support to control a supplying regulator.
As this is not always the case, the regulator is requested as optional. Signed-off-by: Heiko Stuebner <[email protected]> --- .../bindings/input/touchscreen/zforce_ts.txt | 4 +++ drivers/input/touchscreen/zforce_ts.c | 30 ++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt index 2faf1f1..80c37df 100644 --- a/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt +++ b/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt @@ -9,6 +9,9 @@ Required properties: - x-size: horizontal resolution of touchscreen - y-size: vertical resolution of touchscreen +Optional properties: +- vdd-supply: Regulator controlling the controller supply + Example: i2c@00000000 { @@ -18,6 +21,7 @@ Example: compatible = "neonode,zforce"; reg = <0x50>; interrupts = <2 0>; + vdd-supply = <®_zforce_vdd>; gpios = <&gpio5 6 0>, /* INT */ <&gpio5 9 0>; /* RST */ diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c index 01d30ce..39ca962 100644 --- a/drivers/input/touchscreen/zforce_ts.c +++ b/drivers/input/touchscreen/zforce_ts.c @@ -29,6 +29,8 @@ #include <linux/sysfs.h> #include <linux/input/mt.h> #include <linux/platform_data/zforce_ts.h> +#include <linux/regulator/consumer.h> +#include <linux/delay.h> #include <linux/of.h> #include <linux/of_gpio.h> @@ -117,6 +119,8 @@ struct zforce_ts { const struct zforce_ts_platdata *pdata; char phys[32]; + struct regulator *reg_vdd; + bool suspending; bool suspended; bool boot_complete; @@ -690,6 +694,11 @@ static void zforce_reset(void *data) struct zforce_ts *ts = data; gpio_set_value(ts->pdata->gpio_rst, 0); + + udelay(10); + + if (!IS_ERR(ts->reg_vdd)) + regulator_disable(ts->reg_vdd); } static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) @@ -765,10 +774,31 @@ static int zforce_probe(struct i2c_client *client, return ret; } + ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); + if (IS_ERR(ts->reg_vdd) && PTR_ERR(ts->reg_vdd) == -EPROBE_DEFER) + return PTR_ERR(ts->reg_vdd); + + if (!IS_ERR(ts->reg_vdd)) { + ret = regulator_enable(ts->reg_vdd); + if (ret) + return ret; + + /* + * according to datasheet add 100us grace time after regular + * regulator enable delay. + */ + udelay(100); + } + ret = devm_add_action(&client->dev, zforce_reset, ts); if (ret) { dev_err(&client->dev, "failed to register reset action, %d\n", ret); + + /* hereafter the regulator will be disabled by the action */ + if (!IS_ERR(ts->reg_vdd)) + regulator_disable(ts->reg_vdd); + return ret; } -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
