linux-kernel - Re: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver

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Message-ID: <20160411082428.GA26066@dtor-ws>
Date:	Mon, 11 Apr 2016 01:24:28 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"jeffrey.lin" <yajohn@...il.com>
Cc:	rydberg@...omail.se, grant.likely@...aro.org, robh+dt@...nel.org,
	jeesw@...fas.com, bleung@...omium.org, scott.liu@....com.tw,
	jeffrey.lin@...-ic.com, roger.yang@...-ic.com, KP.li@...-ic.com,
	albert.shieh@...-ic.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver

Hi Jeffrey,

On Fri, Mar 25, 2016 at 01:21:09PM +0800, jeffrey.lin wrote:
> +#define MAX_PACKET_SIZE		60
...
> +#define RAYDIUM_FW_PAGESIZE	128
...
> +
> +static int raydium_i2c_send(struct i2c_client *client,
> +	u8 addr, u8 *data, size_t len)
> +{
> +	u8 buf[MAX_PACKET_SIZE + 1];
> +	int tries = 0;
> +
> +	if (len > MAX_PACKET_SIZE)
> +		return -EINVAL;
...
> +static int raydium_i2c_fw_write_page(struct i2c_client *client,
> +				const void *page)
> +{
> +	static const u8 ack_ok[] = { 0x55, 0xAA };
> +	u8 buf[2];
> +	int retry;
> +	int error;
> +
> +	for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
> +		error = raydium_i2c_send(client, CMD_BOOT_WRT,
> +			(u8 *)page, RAYDIUM_FW_PAGESIZE);
> +		if (error) {
> +			dev_err(&client->dev,
> +				"BLDR Write Page failed: %d\n", error);
> +			continue;
> +		}

Given the above definitions of MAX_PACKET_SIZE and
RAYDIUM_FW_PAGESIZE I do not believe that firmware update is working.
What is the biggest buffer that can be sent to the device? Maybe we
should allocate it dynamically?

I am also wondering about formatting command structure as byte sequence.
Would it be better to define it as:

struct raidium_cmd {
	u32 bank;
	int len;
	u8 cmd[RAIDIUM_MAX_CMD_LEN];
}

What is the longest command that the controller supports?

(Do not resubmit the driver yet, let's discuss first).

Thanks.

-- 
Dmitry