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

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Date:	Fri, 27 May 2016 09:34:12 -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, 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 Tue, May 24, 2016 at 05:31:41PM +0800, jeffrey.lin wrote:
> Hi Dmitry:
> >
> >	BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
> >
> >	for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
> >		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
> >		buf[BL_PAGE_STR] = i ? 0xff : 0;
> Change to buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
> >		buf[BL_PKG_IDX] = i;
> >
> >		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
> >		memcpy(&buf[BL_DATA_STR], data, xfer_len);
> >		if (len < RM_BL_WRT_PKG_SIZE)
> >			memset(&buf[BL_DATA_STR + xfer_len], 0xff,
> >				RM_BL_WRT_PKG_SIZE - xfer_len);
> >
> >		error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
> >						 RAYDIUM_WAIT_READY);
> >		if (error) {
> >			dev_err(&client->dev,
> >				"page write command failed for page %d, chunk %d: %d\n",
> >				page_idx, pkg_idx, error);
> >			return error;
> >		}
> >
> >		data += xfer_len;
> >		len -= xfer_len;
> >	}
> This work on my hand chromebook.
> 
> > static int raydium_i2c_read_message(struct i2c_client *client,
> > 				    u32 addr, void *data, size_t len)
> > {
> > 	__le32 le_addr;
> > 	size_t xfer_len;
> > 	int error;
> > 
> > 	while (len) {
> > 		xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
> > 
> > 		le_addr = cpu_to_le32(addr);
> > 
> > 		error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
> > 					 &le_addr, sizeof(le_addr));
> > 		if (!error)/*read from last byte addr.*/
> > 			error = raydium_i2c_read(client, le_addr & 0xff,
> > 						 data, xfer_len)
> Change as
> 			error = raydium_i2c_read(client, addr & 0xff,
> 						 data, xfer_len);
> 
> I've fixed this issues and submit new patch to upstream. Please help check that.

I do not think that we want the gratuitous change from BE to LE here, as
this will give users trouble with devices that still use older
bootloader firmwares.

I did change this back to BE, along with a couple of other tweaks, and
uploaded what I hope is the final version of the patch to "raydium"
branch of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git

Please give it a try on your side and if everything works I will queue
the driver to be merged in the next merge window.

Thanks!

-- 
Dmitry