[PATCH] fbdev: ssd1307fb: return proper error code if write command fails
From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Date: 2015-01-14 08:24:57
this patch fixes ssd1307fb_ssd1306_init() function to return proper error codes in case of failures. Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> --- drivers/video/fbdev/ssd1307fb.c | 54 ++++++++++++++++++++++++++++++----------- 1 file changed, 40 insertions(+), 14 deletions(-)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index f4daa59..528ea16 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c@@ -320,7 +320,9 @@ 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;
@@ -336,63 +338,87 @@ 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, - SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL); + 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, - par->page_offset + (par->height / 8) - 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->page_offset + (par->height / 8) - 1); if (ret < 0) return ret;
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1.9.1