renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 20:23:57 +08:00
Code

video: ssd1307fb: Rework the communication functions

Browse Source 
To efficiently send a whole page to the display, we need to be able to
manipulate more easily the data arrays that has to be sent to the OLED
controller. As such, this patch introduces a ssd1307fb_array structure
that handles both the small header to be sent over i2c, which contains
the type of information sent, and the raw bytes after that.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Maxime Ripard 2013-04-22 12:02:23 +02:00 committed by Tomi Valkeinen
parent bbc79089ae
commit 9f7714d463
1 changed files with 50 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/video/ssd1307fb.c
View File

@ -51,6 +51,11 @@ struct ssd1307fb_par {
u32 width;
};
struct ssd1307fb_array {
u8 type;
u8 data[0];
};
static struct fb_fix_screeninfo ssd1307fb_fix = {
.id = "Solomon SSD1307",
.type = FB_TYPE_PACKED_PIXELS,
@ -65,49 +70,67 @@ static struct fb_var_screeninfo ssd1307fb_var = {
.bits_per_pixel = 1,
};
static int ssd1307fb_write_array(struct i2c_client *client, u8 type, u8 *cmd, u32 len)
static struct ssd1307fb_array *ssd1307fb_alloc_array(u32 len, u8 type)
{
u8 *buf;
int ret = 0;
struct ssd1307fb_array *array;
buf = kzalloc(len + 1, GFP_KERNEL);
if (!buf) {
dev_err(&client->dev, "Couldn't allocate sending buffer.\n");
return -ENOMEM;
}
array = kzalloc(sizeof(struct ssd1307fb_array) + len, GFP_KERNEL);
if (!array)
return NULL;
buf[0] = type;
memcpy(buf + 1, cmd, len);
array->type = type;
ret = i2c_master_send(client, buf, len + 1);
if (ret != len + 1) {
dev_err(&client->dev, "Couldn't send I2C command.\n");
goto error;
}
error:
kfree(buf);
return ret;
return array;
}
static inline int ssd1307fb_write_cmd_array(struct i2c_client *client, u8 *cmd, u32 len)
static int ssd1307fb_write_array(struct i2c_client *client,
struct ssd1307fb_array *array, u32 len)
{
return ssd1307fb_write_array(client, SSD1307FB_COMMAND, cmd, len);
int ret;
len += sizeof(struct ssd1307fb_array);
ret = i2c_master_send(client, (u8 *)array, len);
if (ret != len) {
dev_err(&client->dev, "Couldn't send I2C command.\n");
return ret;
}
return 0;
}
static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd)
{
return ssd1307fb_write_cmd_array(client, &cmd, 1);
}
struct ssd1307fb_array *array;
int ret;
static inline int ssd1307fb_write_data_array(struct i2c_client *client, u8 *cmd, u32 len)
{
return ssd1307fb_write_array(client, SSD1307FB_DATA, cmd, len);
array = ssd1307fb_alloc_array(1, SSD1307FB_COMMAND);
if (!array)
return -ENOMEM;
array->data[0] = cmd;
ret = ssd1307fb_write_array(client, array, 1);
kfree(array);
return ret;
}
static inline int ssd1307fb_write_data(struct i2c_client *client, u8 data)
{
return ssd1307fb_write_data_array(client, &data, 1);
struct ssd1307fb_array *array;
int ret;
array = ssd1307fb_alloc_array(1, SSD1307FB_DATA);
if (!array)
return -ENOMEM;
array->data[0] = data;
ret = ssd1307fb_write_array(client, array, 1);
kfree(array);
return ret;
}
static void ssd1307fb_update_display(struct ssd1307fb_par *par)