linux-kernel - Re: [PATCH 1/3] Input: elan_i2c - Do no operation for elan_smbus_set

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Message-ID: <20200721161236.GI1665100@dtor-ws>
Date:   Tue, 21 Jul 2020 09:12:36 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Dave Wang <dave.wang@....com.tw>
Cc:     Linux-input@...r.kernel.org, Linux-kernel@...r.kernel.org,
        phoenix@....com.tw, josh.chen@....com.tw, jingle.wu@....com.tw,
        kai.heng.feng@...onical.com
Subject: Re: [PATCH 1/3] Input: elan_i2c - Do no operation for
 elan_smbus_set_mode function

Hi Dave,

On Mon, Dec 09, 2019 at 06:11:07AM -0500, Dave Wang wrote:
> Some touchpads might get error while triggerring the set_mode command
> in SMBus interface. Do no operation for elan_smbus_set_mode function.

Are there devices that do not trigger errors? How do we put SMbus
devices into low power mode?

> 
> Signed-off-by: Dave Wang <dave.wang@....com.tw>
> ---
>  drivers/input/mouse/elan_i2c_smbus.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/input/mouse/elan_i2c_smbus.c b/drivers/input/mouse/elan_i2c_smbus.c
> index 8c3185d54c73..bcb9ec4a7a6b 100644
> --- a/drivers/input/mouse/elan_i2c_smbus.c
> +++ b/drivers/input/mouse/elan_i2c_smbus.c
> @@ -84,10 +84,7 @@ static int elan_smbus_initialize(struct i2c_client *client)
>  
>  static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
>  {
> -	u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
> -
> -	return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
> -					  sizeof(cmd), cmd);
> +	return 0; /* A no-op */
>  }
>  
>  static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
> -- 
> 2.17.1
> 

Thanks.

-- 
Dmitry