diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/ssd1307fb.c | 51 |
1 files changed, 38 insertions, 13 deletions
diff --git a/drivers/video/ssd1307fb.c b/drivers/video/ssd1307fb.c index 04a435886855..44967c8fef2b 100644 --- a/drivers/video/ssd1307fb.c +++ b/drivers/video/ssd1307fb.c @@ -19,6 +19,12 @@ #define SSD1307FB_DATA 0x40 #define SSD1307FB_COMMAND 0x80 +#define SSD1307FB_SET_ADDRESS_MODE 0x20 +#define SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL (0x00) +#define SSD1307FB_SET_ADDRESS_MODE_VERTICAL (0x01) +#define SSD1307FB_SET_ADDRESS_MODE_PAGE (0x02) +#define SSD1307FB_SET_COL_RANGE 0x21 +#define SSD1307FB_SET_PAGE_RANGE 0x22 #define SSD1307FB_CONTRAST 0x81 #define SSD1307FB_CHARGE_PUMP 0x8d #define SSD1307FB_SEG_REMAP_ON 0xa1 @@ -135,9 +141,15 @@ static inline int ssd1307fb_write_data(struct i2c_client *client, u8 data) static void ssd1307fb_update_display(struct ssd1307fb_par *par) { + struct ssd1307fb_array *array; u8 *vmem = par->info->screen_base; int i, j, k; + array = ssd1307fb_alloc_array(par->width * par->height / 8, + SSD1307FB_DATA); + if (!array) + return; + /* * The screen is divided in pages, each having a height of 8 * pixels, and the width of the screen. When sending a byte of @@ -168,29 +180,22 @@ static void ssd1307fb_update_display(struct ssd1307fb_par *par) */ for (i = 0; i < (par->height / 8); i++) { - struct ssd1307fb_array *array; - ssd1307fb_write_cmd(par->client, - SSD1307FB_START_PAGE_ADDRESS + i + par->page_offset); - ssd1307fb_write_cmd(par->client, 0x00); - ssd1307fb_write_cmd(par->client, 0x10); - - array = ssd1307fb_alloc_array(par->width, SSD1307FB_DATA); - for (j = 0; j < par->width; j++) { - array->data[j] = 0; + u32 array_idx = i * par->width + j; + array->data[array_idx] = 0; for (k = 0; k < 8; k++) { u32 page_length = par->width * i; u32 index = page_length + (par->width * k + j) / 8; u8 byte = *(vmem + index); u8 bit = byte & (1 << (j % 8)); bit = bit >> (j % 8); - array->data[j] |= bit << k; + array->data[array_idx] |= bit << k; } } - - ssd1307fb_write_array(par->client, array, par->width); - kfree(array); } + + ssd1307fb_write_array(par->client, array, par->width * par->height / 8); + kfree(array); } @@ -371,6 +376,26 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) 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_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, 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; + /* Turn on the display */ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); if (ret < 0) |