linux-kernel - Re: [PATCH v10 07/12] Input: wacom_i2c

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Date:   Wed, 1 Sep 2021 01:28:48 +0300
From:   Kari Argillander <kari.argillander@...il.com>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-imx@....com, kernel@...gutronix.de, pinglinux@...il.com,
        tatsunosuke.tobita@...om.com, junkpainting@...il.com,
        ping.cheng@...om.com, linux-kernel@...r.kernel.org,
        alistair23@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v10 07/12] Input: wacom_i2c - Clean up the query device
 fields

Just minor style issues checked.

On Sun, Aug 29, 2021 at 07:19:20PM +1000, Alistair Francis wrote:
> Improve the query device fields to be more verbose.
> 
> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> ---
>  drivers/input/touchscreen/wacom_i2c.c | 63 ++++++++++++++++++---------
>  1 file changed, 43 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
> index d6036406a9f3..a35d8fda7e7b 100644
> --- a/drivers/input/touchscreen/wacom_i2c.c
> +++ b/drivers/input/touchscreen/wacom_i2c.c
> @@ -13,16 +13,33 @@
>  #include <linux/irq.h>
>  #include <linux/input/touchscreen.h>
>  #include <linux/interrupt.h>
> +#include <linux/reset.h>
>  #include <linux/of.h>
>  #include <asm/unaligned.h>
>  
> +// Registers

Use /* */ comments.

>  #define WACOM_DESC_REG	0x01
> -#define WACOM_CMD_QUERY0	0x04
> -#define WACOM_CMD_QUERY1	0x00
> -#define WACOM_CMD_QUERY2	0x33
> -#define WACOM_CMD_QUERY3	0x02
> -#define WACOM_CMD_THROW0	0x05
> -#define WACOM_CMD_THROW1	0x00
> +#define WACOM_COMMAND_LSB   0x04
> +#define WACOM_COMMAND_MSB   0x00
> +
> +#define WACOM_DATA_LSB      0x05
> +#define WACOM_DATA_MSB      0x00

You use spaces here. Should be tabs.

> +
> +// Report types
> +#define REPORT_FEATURE      0x30
> +
> +// Requests / operations
> +#define OPCODE_GET_REPORT   0x02
> +
> +// Power settings
> +#define POWER_ON            0x00
> +#define POWER_SLEEP         0x01
> +
> +// Input report ids
> +#define WACOM_PEN_DATA_REPORT           2
> +#define WACOM_SHINONOME_REPORT          26
> +
> +#define WACOM_QUERY_REPORT	3
>  #define WACOM_QUERY_SIZE	22
>  
>  #define WACOM_MAX_DATA_SIZE_BG9     10
> @@ -85,27 +102,30 @@ static int wacom_query_device(struct i2c_client *client,
>  {
>  	int ret;
>  	u8 cmd_wac_desc[] = {WACOM_DESC_REG, 0x00};
> -	u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1,
> -			WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 };
> -	u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 };
>  	u8 data[WACOM_QUERY_SIZE];
> +
> +	u8 get_query_data_cmd[] = {
> +		WACOM_COMMAND_LSB,
> +		WACOM_COMMAND_MSB,
> +		REPORT_FEATURE | WACOM_QUERY_REPORT,
> +		OPCODE_GET_REPORT,
> +		WACOM_DATA_LSB,
> +		WACOM_DATA_MSB,
> +	};
> +
>  	struct i2c_msg msgs[] = {
> +		// Request reading of feature ReportID: 3 (Pen Query Data)

//

>  		{
>  			.addr = client->addr,
>  			.flags = 0,
> -			.len = sizeof(cmd1),
> -			.buf = cmd1,
> -		},
> -		{
> -			.addr = client->addr,
> -			.flags = 0,
> -			.len = sizeof(cmd2),
> -			.buf = cmd2,
> +			.len = sizeof(get_query_data_cmd),
> +			.buf = get_query_data_cmd,
>  		},
> +		// Read 21 bytes

//

>  		{
>  			.addr = client->addr,
>  			.flags = I2C_M_RD,
> -			.len = sizeof(data),
> +			.len = WACOM_QUERY_SIZE - 1,
>  			.buf = data,
>  		},
>  	};
> @@ -158,9 +178,12 @@ static int wacom_query_device(struct i2c_client *client,
>  	}
>  
>  	dev_dbg(&client->dev,
> -		"x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
> +		"x_max:%d, y_max:%d, pressure:%d, fw:%d, "
> +		"distance: %d, tilt_x_max: %d, tilt_y_max: %d\n",
>  		features->x_max, features->y_max,
> -		features->pressure_max, features->fw_version);
> +		features->pressure_max, features->fw_version,
> +		features->distance_max,
> +		features->tilt_x_max, features->tilt_y_max);
>  
>  	return 0;
>  }
> -- 
> 2.31.1
>