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Commit 5b72ae9a authored by Prabhakar Lad's avatar Prabhakar Lad Committed by Tomi Valkeinen
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fbdev: ssd1307fb: return proper error code if write command fails 



this patch fixes ssd1307fb_ssd1306_init() function to return
proper error codes in case of failures.

Signed-off-by: default avatarLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 4d073292

drivers/video/fbdev/ssd1307fb.c

+53 −14
Original line number Diff line number Diff line
@@ -303,7 +303,10 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) 


	/* Set initial contrast */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x7f);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x7f);

	if (ret < 0)

		return ret;
@@ -319,62 +322,98 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) 


	/* Set multiplex ratio value */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_MULTIPLEX_RATIO);

	ret = ret & ssd1307fb_write_cmd(par->client, par->height - 1);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, par->height - 1);

	if (ret < 0)

		return ret;



	/* set display offset value */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x20);

	if (ret < 0)

		return ret;



	/* Set clock frequency */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_CLOCK_FREQ);

	ret = ret & ssd1307fb_write_cmd(par->client, 0xf0);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0xf0);

	if (ret < 0)

		return ret;



	/* Set precharge period in number of ticks from the internal clock */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PRECHARGE_PERIOD);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x22);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x22);

	if (ret < 0)

		return ret;



	/* Set COM pins configuration */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COM_PINS_CONFIG);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x22);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x22);

	if (ret < 0)

		return ret;



	/* Set VCOMH */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_VCOMH);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x49);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x49);

	if (ret < 0)

		return ret;



	/* Turn on the DC-DC Charge Pump */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CHARGE_PUMP);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x14);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x14);

	if (ret < 0)

		return ret;



	/* Switch to horizontal addressing mode */

	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_ADDRESS_MODE);

	ret = ret & ssd1307fb_write_cmd(par->client,

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client,

				  SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x0);

	ret = ret & ssd1307fb_write_cmd(par->client, par->width - 1);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x0);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, par->width - 1);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE);

	ret = ret & ssd1307fb_write_cmd(par->client, 0x0);

	ret = ret & ssd1307fb_write_cmd(par->client,

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client, 0x0);

	if (ret < 0)

		return ret;



	ret = ssd1307fb_write_cmd(par->client,

				  par->page_offset + (par->height / 8) - 1);

	if (ret < 0)

		return ret;