linux-kernel - Re: [PATCH] i2c: core: helper function to detect slave mode

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Date:   Fri, 6 Jan 2017 10:35:39 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Luis Oliveira <Luis.Oliveira@...opsys.com>
Cc:     "wsa@...-dreams.de" <wsa@...-dreams.de>,
        Mark Rutland <mark.rutland@....com>,
        "jarkko.nikula@...ux.intel.com" <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        roliveir <Ramiro.Oliveira@...opsys.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        CARLOS.PALMINHA@...opsys.com
Subject: Re: [PATCH] i2c: core: helper function to detect slave mode

On Thu, Jan 5, 2017 at 11:24 AM, Luis Oliveira
<Luis.Oliveira@...opsys.com> wrote:
> This function has the purpose of mode detection by checking the
> device nodes for a reg matching with the I2C_OWN_SLAVE_ADDREESS flag.
> Currently only checks using OF functions (ACPI slave not supported yet).
>
> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
> ---
> Due to the need of checking if the I2C slave address is our own (in
> other words: if we are the I2C slave) I created a helper function
> (proposed to me by @Andy) to enable that check.
> Currently (because I am not able to test it using ACPI) it only
> supports devicetree declarations.
>
>  drivers/i2c/i2c-core.c | 19 +++++++++++++++++++
>  include/linux/i2c.h    |  1 +
>  2 files changed, 20 insertions(+)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 3de95a29024c..48e705b23c59 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -3691,6 +3691,25 @@ int i2c_slave_unregister(struct i2c_client *client)
>         return ret;
>  }
>  EXPORT_SYMBOL_GPL(i2c_slave_unregister);
> +
> +int i2c_slave_mode_detect(struct device *dev)

This can be bool instead. Otherwise, looks good to me.

> +{
> +       struct device_node *child;
> +       u32 reg;
> +
> +       if (IS_BUILTIN(CONFIG_OF) && dev->of_node) {
> +               for_each_child_of_node(dev->of_node, child) {
> +                       of_property_read_u32(child, "reg", &reg);
> +                       if (reg & I2C_OWN_SLAVE_ADDRESS)
> +                               return 1;
> +               }
> +       } else if (IS_BUILTIN(CONFIG_ACPI) && ACPI_HANDLE(dev)) {
> +               dev_dbg(dev, "ACPI slave is not supported yet\n");
> +       }
> +       return 0;
> +}
> +EXPORT_SYMBOL_GPL(i2c_slave_mode_detect);
> +
>  #endif
>
>  MODULE_AUTHOR("Simon G. Vogl <simon@...uni-linz.ac.at>");
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index b2109c522dec..53cf99569af5 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -282,6 +282,7 @@ enum i2c_slave_event {
>
>  extern int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb);
>  extern int i2c_slave_unregister(struct i2c_client *client);
> +extern int i2c_slave_mode_detect(struct device *dev);
>
>  static inline int i2c_slave_event(struct i2c_client *client,
>                                   enum i2c_slave_event event, u8 *val)
> --
> 2.11.0
>
>