linux-kernel - Re: [PATCH v2 01/14] Input: atmel_mxt_ts - do not pass suspend mode in platform data

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Date:   Mon, 9 Apr 2018 22:44:10 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, Benson Leung <bleung@...omium.org>,
        Nick Dyer <nick@...anahar.org>,
        Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/14] Input: atmel_mxt_ts - do not pass suspend mode
 in platform data

On Tue, Mar 20, 2018 at 03:31:25PM -0700, Dmitry Torokhov wrote:
> The way we are supposed to put controller to sleep and wake it up does not
> depend on the platform, but rather on controller itself, so we want to get
> rid of suspend mode in platform data (and eventually get rid of platform
> data completely). Unfortunately some early chromebooks (the original Pixel,
> Acer C720) were shipped with config that requires manually re-enabling
> touch reporting in T9. We will sort it out, but in the meantime let's
> switch to a simple DMI quirk.
> 
> We'll keep pdata->suspend_mode for now and remove it when we rework
> chromeos-laptop driver.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Applied, thanks.

> ---
>  drivers/input/touchscreen/atmel_mxt_ts.c | 27 +++++++++++++++++++-----
>  1 file changed, 22 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index 7659bc48f1db8..20e1224d1a6db 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -324,6 +324,8 @@ struct mxt_data {
>  
>  	/* for config update handling */
>  	struct completion crc_completion;
> +
> +	enum mxt_suspend_mode suspend_mode;
>  };
>  
>  struct mxt_vb2_buffer {
> @@ -2868,7 +2870,7 @@ static const struct attribute_group mxt_attr_group = {
>  
>  static void mxt_start(struct mxt_data *data)
>  {
> -	switch (data->pdata->suspend_mode) {
> +	switch (data->suspend_mode) {
>  	case MXT_SUSPEND_T9_CTRL:
>  		mxt_soft_reset(data);
>  
> @@ -2886,12 +2888,11 @@ static void mxt_start(struct mxt_data *data)
>  		mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
>  		break;
>  	}
> -
>  }
>  
>  static void mxt_stop(struct mxt_data *data)
>  {
> -	switch (data->pdata->suspend_mode) {
> +	switch (data->suspend_mode) {
>  	case MXT_SUSPEND_T9_CTRL:
>  		/* Touch disable */
>  		mxt_write_object(data,
> @@ -2954,8 +2955,6 @@ static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
>  		pdata->t19_keymap = keymap;
>  	}
>  
> -	pdata->suspend_mode = MXT_SUSPEND_DEEP_SLEEP;
> -
>  	return pdata;
>  }
>  #else
> @@ -3109,6 +3108,21 @@ mxt_get_platform_data(struct i2c_client *client)
>  	return ERR_PTR(-EINVAL);
>  }
>  
> +static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
> +		},
> +	},
> +	{ }
> +};
> +
>  static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  {
>  	struct mxt_data *data;
> @@ -3135,6 +3149,9 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	init_completion(&data->reset_completion);
>  	init_completion(&data->crc_completion);
>  
> +	data->suspend_mode = dmi_check_system(chromebook_T9_suspend_dmi) ?
> +		MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP;
> +
>  	data->reset_gpio = devm_gpiod_get_optional(&client->dev,
>  						   "reset", GPIOD_OUT_LOW);
>  	if (IS_ERR(data->reset_gpio)) {
> -- 
> 2.16.2.804.g6dcf76e118-goog
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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