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-rw-r--r--drivers/video/ssd1307fb.c273
1 files changed, 202 insertions, 71 deletions
diff --git a/drivers/video/ssd1307fb.c b/drivers/video/ssd1307fb.c
index 9ef05d3ef68a..a0d6f96ec4e4 100644
--- a/drivers/video/ssd1307fb.c
+++ b/drivers/video/ssd1307fb.c
@@ -16,24 +16,39 @@
#include <linux/pwm.h>
#include <linux/delay.h>
-#define SSD1307FB_WIDTH 96
-#define SSD1307FB_HEIGHT 16
-
#define SSD1307FB_DATA 0x40
#define SSD1307FB_COMMAND 0x80
#define SSD1307FB_CONTRAST 0x81
+#define SSD1307FB_CHARGE_PUMP 0x8d
#define SSD1307FB_SEG_REMAP_ON 0xa1
#define SSD1307FB_DISPLAY_OFF 0xae
+#define SSD1307FB_SET_MULTIPLEX_RATIO 0xa8
#define SSD1307FB_DISPLAY_ON 0xaf
#define SSD1307FB_START_PAGE_ADDRESS 0xb0
+#define SSD1307FB_SET_DISPLAY_OFFSET 0xd3
+#define SSD1307FB_SET_CLOCK_FREQ 0xd5
+#define SSD1307FB_SET_PRECHARGE_PERIOD 0xd9
+#define SSD1307FB_SET_COM_PINS_CONFIG 0xda
+#define SSD1307FB_SET_VCOMH 0xdb
+
+struct ssd1307fb_par;
+
+struct ssd1307fb_ops {
+ int (*init)(struct ssd1307fb_par *);
+ int (*remove)(struct ssd1307fb_par *);
+};
struct ssd1307fb_par {
struct i2c_client *client;
+ u32 height;
struct fb_info *info;
+ struct ssd1307fb_ops *ops;
+ u32 page_offset;
struct pwm_device *pwm;
u32 pwm_period;
int reset;
+ u32 width;
};
static struct fb_fix_screeninfo ssd1307fb_fix = {
@@ -43,15 +58,10 @@ static struct fb_fix_screeninfo ssd1307fb_fix = {
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
- .line_length = SSD1307FB_WIDTH / 8,
.accel = FB_ACCEL_NONE,
};
static struct fb_var_screeninfo ssd1307fb_var = {
- .xres = SSD1307FB_WIDTH,
- .yres = SSD1307FB_HEIGHT,
- .xres_virtual = SSD1307FB_WIDTH,
- .yres_virtual = SSD1307FB_HEIGHT,
.bits_per_pixel = 1,
};
@@ -134,16 +144,17 @@ static void ssd1307fb_update_display(struct ssd1307fb_par *par)
* (5) A4 B4 C4 D4 E4 F4 G4 H4
*/
- for (i = 0; i < (SSD1307FB_HEIGHT / 8); i++) {
- ssd1307fb_write_cmd(par->client, SSD1307FB_START_PAGE_ADDRESS + (i + 1));
+ for (i = 0; i < (par->height / 8); i++) {
+ 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);
- for (j = 0; j < SSD1307FB_WIDTH; j++) {
+ for (j = 0; j < par->width; j++) {
u8 buf = 0;
for (k = 0; k < 8; k++) {
- u32 page_length = SSD1307FB_WIDTH * i;
- u32 index = page_length + (SSD1307FB_WIDTH * k + j) / 8;
+ 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);
@@ -227,16 +238,147 @@ static struct fb_deferred_io ssd1307fb_defio = {
.deferred_io = ssd1307fb_deferred_io,
};
+static int ssd1307fb_ssd1307_init(struct ssd1307fb_par *par)
+{
+ int ret;
+
+ par->pwm = pwm_get(&par->client->dev, NULL);
+ if (IS_ERR(par->pwm)) {
+ dev_err(&par->client->dev, "Could not get PWM from device tree!\n");
+ return PTR_ERR(par->pwm);
+ }
+
+ par->pwm_period = pwm_get_period(par->pwm);
+ /* Enable the PWM */
+ pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period);
+ pwm_enable(par->pwm);
+
+ dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n",
+ par->pwm->pwm, par->pwm_period);
+
+ /* Map column 127 of the OLED to segment 0 */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON);
+ if (ret < 0)
+ return ret;
+
+ /* Turn on the display */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ssd1307fb_ssd1307_remove(struct ssd1307fb_par *par)
+{
+ pwm_disable(par->pwm);
+ pwm_put(par->pwm);
+ return 0;
+}
+
+static struct ssd1307fb_ops ssd1307fb_ssd1307_ops = {
+ .init = ssd1307fb_ssd1307_init,
+ .remove = ssd1307fb_ssd1307_remove,
+};
+
+static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par)
+{
+ int ret;
+
+ /* Set initial contrast */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST);
+ ret = ret & ssd1307fb_write_cmd(par->client, 0x7f);
+ if (ret < 0)
+ return ret;
+
+ /* Set COM direction */
+ ret = ssd1307fb_write_cmd(par->client, 0xc8);
+ if (ret < 0)
+ return ret;
+
+ /* Set segment re-map */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON);
+ if (ret < 0)
+ return ret;
+
+ /* 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;
+
+ /* set display offset value */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET);
+ 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;
+
+ /* 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;
+
+ /* 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;
+
+ /* Set VCOMH */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_VCOMH);
+ 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;
+
+ /* Turn on the display */
+ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static struct ssd1307fb_ops ssd1307fb_ssd1306_ops = {
+ .init = ssd1307fb_ssd1306_init,
+};
+
+static const struct of_device_id ssd1307fb_of_match[] = {
+ {
+ .compatible = "solomon,ssd1306fb-i2c",
+ .data = (void *)&ssd1307fb_ssd1306_ops,
+ },
+ {
+ .compatible = "solomon,ssd1307fb-i2c",
+ .data = (void *)&ssd1307fb_ssd1307_ops,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ssd1307fb_of_match);
+
static int ssd1307fb_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct fb_info *info;
- u32 vmem_size = SSD1307FB_WIDTH * SSD1307FB_HEIGHT / 8;
+ struct device_node *node = client->dev.of_node;
+ u32 vmem_size;
struct ssd1307fb_par *par;
u8 *vmem;
int ret;
- if (!client->dev.of_node) {
+ if (!node) {
dev_err(&client->dev, "No device tree data found!\n");
return -EINVAL;
}
@@ -247,6 +389,31 @@ static int ssd1307fb_probe(struct i2c_client *client,
return -ENOMEM;
}
+ par = info->par;
+ par->info = info;
+ par->client = client;
+
+ par->ops = (struct ssd1307fb_ops *)of_match_device(ssd1307fb_of_match,
+ &client->dev)->data;
+
+ par->reset = of_get_named_gpio(client->dev.of_node,
+ "reset-gpios", 0);
+ if (!gpio_is_valid(par->reset)) {
+ ret = -EINVAL;
+ goto fb_alloc_error;
+ }
+
+ if (of_property_read_u32(node, "solomon,width", &par->width))
+ par->width = 96;
+
+ if (of_property_read_u32(node, "solomon,height", &par->height))
+ par->width = 16;
+
+ if (of_property_read_u32(node, "solomon,page-offset", &par->page_offset))
+ par->page_offset = 1;
+
+ vmem_size = par->width * par->height / 8;
+
vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL);
if (!vmem) {
dev_err(&client->dev, "Couldn't allocate graphical memory.\n");
@@ -256,9 +423,15 @@ static int ssd1307fb_probe(struct i2c_client *client,
info->fbops = &ssd1307fb_ops;
info->fix = ssd1307fb_fix;
+ info->fix.line_length = par->width / 8;
info->fbdefio = &ssd1307fb_defio;
info->var = ssd1307fb_var;
+ info->var.xres = par->width;
+ info->var.xres_virtual = par->width;
+ info->var.yres = par->height;
+ info->var.yres_virtual = par->height;
+
info->var.red.length = 1;
info->var.red.offset = 0;
info->var.green.length = 1;
@@ -272,17 +445,6 @@ static int ssd1307fb_probe(struct i2c_client *client,
fb_deferred_io_init(info);
- par = info->par;
- par->info = info;
- par->client = client;
-
- par->reset = of_get_named_gpio(client->dev.of_node,
- "reset-gpios", 0);
- if (!gpio_is_valid(par->reset)) {
- ret = -EINVAL;
- goto reset_oled_error;
- }
-
ret = devm_gpio_request_one(&client->dev, par->reset,
GPIOF_OUT_INIT_HIGH,
"oled-reset");
@@ -293,23 +455,6 @@ static int ssd1307fb_probe(struct i2c_client *client,
goto reset_oled_error;
}
- par->pwm = pwm_get(&client->dev, NULL);
- if (IS_ERR(par->pwm)) {
- dev_err(&client->dev, "Could not get PWM from device tree!\n");
- ret = PTR_ERR(par->pwm);
- goto pwm_error;
- }
-
- par->pwm_period = pwm_get_period(par->pwm);
-
- dev_dbg(&client->dev, "Using PWM%d with a %dns period.\n", par->pwm->pwm, par->pwm_period);
-
- ret = register_framebuffer(info);
- if (ret) {
- dev_err(&client->dev, "Couldn't register the framebuffer\n");
- goto fbreg_error;
- }
-
i2c_set_clientdata(client, info);
/* Reset the screen */
@@ -318,34 +463,25 @@ static int ssd1307fb_probe(struct i2c_client *client,
gpio_set_value(par->reset, 1);
udelay(4);
- /* Enable the PWM */
- pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period);
- pwm_enable(par->pwm);
-
- /* Map column 127 of the OLED to segment 0 */
- ret = ssd1307fb_write_cmd(client, SSD1307FB_SEG_REMAP_ON);
- if (ret < 0) {
- dev_err(&client->dev, "Couldn't remap the screen.\n");
- goto remap_error;
+ if (par->ops->init) {
+ ret = par->ops->init(par);
+ if (ret)
+ goto reset_oled_error;
}
- /* Turn on the display */
- ret = ssd1307fb_write_cmd(client, SSD1307FB_DISPLAY_ON);
- if (ret < 0) {
- dev_err(&client->dev, "Couldn't turn the display on.\n");
- goto remap_error;
+ ret = register_framebuffer(info);
+ if (ret) {
+ dev_err(&client->dev, "Couldn't register the framebuffer\n");
+ goto panel_init_error;
}
dev_info(&client->dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size);
return 0;
-remap_error:
- unregister_framebuffer(info);
- pwm_disable(par->pwm);
-fbreg_error:
- pwm_put(par->pwm);
-pwm_error:
+panel_init_error:
+ if (par->ops->remove)
+ par->ops->remove(par);
reset_oled_error:
fb_deferred_io_cleanup(info);
fb_alloc_error:
@@ -359,8 +495,8 @@ static int ssd1307fb_remove(struct i2c_client *client)
struct ssd1307fb_par *par = info->par;
unregister_framebuffer(info);
- pwm_disable(par->pwm);
- pwm_put(par->pwm);
+ if (par->ops->remove)
+ par->ops->remove(par);
fb_deferred_io_cleanup(info);
framebuffer_release(info);
@@ -368,17 +504,12 @@ static int ssd1307fb_remove(struct i2c_client *client)
}
static const struct i2c_device_id ssd1307fb_i2c_id[] = {
+ { "ssd1306fb", 0 },
{ "ssd1307fb", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ssd1307fb_i2c_id);
-static const struct of_device_id ssd1307fb_of_match[] = {
- { .compatible = "solomon,ssd1307fb-i2c" },
- {},
-};
-MODULE_DEVICE_TABLE(of, ssd1307fb_of_match);
-
static struct i2c_driver ssd1307fb_driver = {
.probe = ssd1307fb_probe,
.remove = ssd1307fb_remove,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 08:44:11 +0000