linux-kernel - Re: [PATCH 4/8] iio: light: cm32181: Change reg_init to use a bitmap of which registers to init

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Message-ID: <CAHp75VfqBGyN5KZW1fZtvCU6GgReDLqcPkWxF4Ovku9n9vdjPA@mail.gmail.com>
Date:   Sun, 26 Apr 2020 20:44:46 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Kevin Tsai <ktsai@...ellamicro.com>,
        Jonathan Cameron <jic23@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 4/8] iio: light: cm32181: Change reg_init to use a bitmap
 of which registers to init

On Sun, Apr 26, 2020 at 2:03 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> This is a preparation patch for reading some ACPI tables which give
> init values for multiple registers.
>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/iio/light/cm32181.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> index e8be20d3902c..e31c1005b03d 100644
> --- a/drivers/iio/light/cm32181.c
> +++ b/drivers/iio/light/cm32181.c
> @@ -26,7 +26,7 @@
>  #define CM32181_REG_ADDR_ID            0x07
>
>  /* Number of Configurable Registers */
> -#define CM32181_CONF_REG_NUM           0x01
> +#define CM32181_CONF_REG_NUM           4
>
>  /* CMD register */
>  #define CM32181_CMD_ALS_DISABLE                BIT(0)
> @@ -53,10 +53,6 @@
>
>  #define SMBUS_ALERT_RESPONSE_ADDRESS   0x0c
>
> -static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
> -       CM32181_REG_ADDR_CMD,
> -};
> -
>  /* CM3218 Family */
>  static const int cm3218_als_it_bits[] = { 0, 1, 2, 3 };
>  static const int cm3218_als_it_values[] = { 100000, 200000, 400000, 800000 };
> @@ -71,6 +67,7 @@ struct cm32181_chip {
>         struct i2c_client *client;
>         struct mutex lock;
>         u16 conf_regs[CM32181_CONF_REG_NUM];

> +       int init_regs_bitmap;

unsigned long

>         int calibscale;
>         int num_als_it;
>         const int *als_it_bits;
> @@ -117,14 +114,17 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
>         /* Default Values */
>         cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
>                         CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
> +       cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD);
>         cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
>
>         /* Initialize registers*/
>         for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
> -               ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
> -                       cm32181->conf_regs[i]);
> -               if (ret < 0)
> -                       return ret;
> +               if (cm32181->init_regs_bitmap & BIT(i)) {

for_each_set_bit()

> +                       ret = i2c_smbus_write_word_data(client, i,
> +                                                       cm32181->conf_regs[i]);
> +                       if (ret < 0)
> +                               return ret;
> +               }
>         }
>
>         return 0;
> --
> 2.26.0
>


-- 
With Best Regards,
Andy Shevchenko