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Groups > linux.kernel > #1405415 > unrolled thread

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

Started by"jeffrey.lin" <yajohn@gmail.com>
First post2016-05-23 16:50 +0200
Last post2016-05-23 18:30 +0200
Articles 2 — 2 participants

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  Re: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver "jeffrey.lin" <yajohn@gmail.com> - 2016-05-23 16:50 +0200
    Re: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-05-23 18:30 +0200

#1405415 — Re: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver

From"jeffrey.lin" <yajohn@gmail.com>
Date2016-05-23 16:50 +0200
SubjectRe: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver
Message-ID<rBZl7-74g-7@gated-at.bofh.it>
Hi Dmitry:

>static int raydium_i2c_read_message(struct i2c_client *client,
>				    u32 addr, void *data, size_t len)
>{
>	__le32 le_addr;
>	size_t xfer_len;
>	u32 shift_addr;
>	int error;
>
>	while (len) {
>		xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
>
>		le_addr = cpu_to_le32(addr);
>
>		shift_addr = le_addr >> 8;/*send the first 3rd byte addr.*/
Drop this. Change touch MCU setting to solve this issue
>		error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
>					 &shift_addr, sizeof(le_addr));
>		if (!error)/*read from last byte addr.*/
>			error = raydium_i2c_read(client, le_addr & 0xff,
>						 data, xfer_len);
>		if (error)
>			return error;
>
>		len -= xfer_len;
>		data += xfer_len;
>		addr += xfer_len;
>	}
>
>	return 0;
>}
modify as below.

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);
		if (error)
			return error;

		len -= xfer_len;
		data += xfer_len;
		addr += xfer_len;
	}

	return 0;
}

>
>>> static int raydium_i2c_fw_write_page(struct i2c_client *client,
>>> 				     u16 page_idx, const void *data, size_t len)
>>> {
>>> 	u8 buf[RM_BL_WRT_LEN];
>>> 	u8 pkg_idx = 1;
>>> 	size_t xfer_len;
>>> 	int error;
>>> 
>>> 	while (len) {
>>> 		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
>>> 		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
>>> 		/*FIXME,Touch MCU need zero index as start page*/
>>> 		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
>>> 		buf[BL_PKG_IDX] = pkg_idx++;
>>> 
>>> 		memcpy(&buf[BL_DATA_STR], data, xfer_len);
>>> 
>>> 		if (len < RM_BL_WRT_PKG_SIZE) {
>>> 			buf[BL_PKG_IDX] = 4;
Drop this one. Modfy boot loader firmware to meet this issue. So final function as below.
static int raydium_i2c_fw_write_page(struct i2c_client *client,
				     u16 page_idx, const void *data, size_t len)
{
	u8 buf[RM_BL_WRT_LEN];
	u8 pkg_idx = 1;
	size_t xfer_len;
	int error;

	while (len) {
		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
		/*FIXME,Touch MCU need zero index as start page*/
		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
		buf[BL_PKG_IDX] = pkg_idx++;

		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;
	}

	return error;
}
Otherwise, Do you have any concern about my patch? If not, I'll send new patch soon.

Thanks.

Jeffrey

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#1405497

FromDmitry Torokhov <dmitry.torokhov@gmail.com>
Date2016-05-23 18:30 +0200
Message-ID<rC0TU-8cl-9@gated-at.bofh.it>
In reply to#1405415
Hi Jeffrey,

On Mon, May 23, 2016 at 10:43:53PM +0800, jeffrey.lin wrote:
> Hi Dmitry:
> 
> >static int raydium_i2c_read_message(struct i2c_client *client,
> >				    u32 addr, void *data, size_t len)
> >{
> >	__le32 le_addr;
> >	size_t xfer_len;
> >	u32 shift_addr;
> >	int error;
> >
> >	while (len) {
> >		xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
> >
> >		le_addr = cpu_to_le32(addr);
> >
> >		shift_addr = le_addr >> 8;/*send the first 3rd byte addr.*/
> Drop this. Change touch MCU setting to solve this issue
> >		error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
> >					 &shift_addr, sizeof(le_addr));
> >		if (!error)/*read from last byte addr.*/
> >			error = raydium_i2c_read(client, le_addr & 0xff,
> >						 data, xfer_len);
> >		if (error)
> >			return error;
> >
> >		len -= xfer_len;
> >		data += xfer_len;
> >		addr += xfer_len;
> >	}
> >
> >	return 0;
> >}
> modify as below.
> 
> 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);

No, not "le_addr & 0xff", "addr & 0xff"! When you do calculations, you
have to do it using values in CPU endianness, not fixed endianness (BE
or LE) so that the code will work on all architectures.

> 		if (error)
> 			return error;
> 
> 		len -= xfer_len;
> 		data += xfer_len;
> 		addr += xfer_len;
> 	}
> 
> 	return 0;
> }
> 
> >
> >>> static int raydium_i2c_fw_write_page(struct i2c_client *client,
> >>> 				     u16 page_idx, const void *data, size_t len)
> >>> {
> >>> 	u8 buf[RM_BL_WRT_LEN];
> >>> 	u8 pkg_idx = 1;
> >>> 	size_t xfer_len;
> >>> 	int error;
> >>> 
> >>> 	while (len) {
> >>> 		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
> >>> 		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
> >>> 		/*FIXME,Touch MCU need zero index as start page*/
> >>> 		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
> >>> 		buf[BL_PKG_IDX] = pkg_idx++;
> >>> 
> >>> 		memcpy(&buf[BL_DATA_STR], data, xfer_len);
> >>> 
> >>> 		if (len < RM_BL_WRT_PKG_SIZE) {
> >>> 			buf[BL_PKG_IDX] = 4;
> Drop this one. Modfy boot loader firmware to meet this issue. So final function as below.
> static int raydium_i2c_fw_write_page(struct i2c_client *client,
> 				     u16 page_idx, const void *data, size_t len)
> {
> 	u8 buf[RM_BL_WRT_LEN];
> 	u8 pkg_idx = 1;
> 	size_t xfer_len;
> 	int error;
> 
> 	while (len) {
> 		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
> 		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
> 		/*FIXME,Touch MCU need zero index as start page*/
> 		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
> 		buf[BL_PKG_IDX] = pkg_idx++;
> 
> 		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;
> 	}
> 
> 	return error;
> }

What will be the trigger for the flash? If you really need full page,
then you want to :

	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;
		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;
	}

The BUILD_BUG_ON is because I do not want to handle the case where last
chunk would cross over the page boundary so we'd have to cut it short.
It simply is not worth it.

Thanks.

-- 
Dmitry

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