Re: [PATCH] input: zforce: add regulator handling

[Heiko Stübner]

Hi Dmitry,

Am Dienstag, 22. April 2014, 21:19:57 schrieb Heiko Stübner:
> From: Heiko Stuebner <heiko.stueb...@bq.com>
> 
> 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 <heiko.stueb...@bq.com>

ping?


Thanks
Heiko

> ---
>  .../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 = <&reg_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;
>       }

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