Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-15 16:41:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'fbdev-3.11' of git://gitorious.org/linux-omap-dss2/linux into fbdev/for-next

Browse Source
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2013-06-14 17:52:18 +08:00
commit 8ea2c86449
4 changed files with 339 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/devicetree/bindings/video/ssd1307fb.txt
View File

@ -1,13 +1,17 @@
* Solomon SSD1307 Framebuffer Driver
Required properties:
- compatible: Should be "solomon,ssd1307fb-<bus>". The only supported bus for
now is i2c.
- compatible: Should be "solomon,<chip>fb-<bus>". The only supported bus for
now is i2c, and the supported chips are ssd1306 and ssd1307.
- reg: Should contain address of the controller on the I2C bus. Most likely
0x3c or 0x3d
- pwm: Should contain the pwm to use according to the OF device tree PWM
specification [0]
specification [0]. Only required for the ssd1307.
- reset-gpios: Should contain the GPIO used to reset the OLED display
- solomon,height: Height in pixel of the screen driven by the controller
- solomon,width: Width in pixel of the screen driven by the controller
- solomon,page-offset: Offset of pages (band of 8 pixels) that the screen is
mapped to.
Optional properties:
- reset-active-low: Is the reset gpio is active on physical low?

55
drivers/video/of_display_timing.c
View File

@ -53,21 +53,16 @@ static int parse_timing_property(struct device_node *np, const char *name,
}
/**
* of_get_display_timing - parse display_timing entry from device_node
* of_parse_display_timing - parse display_timing entry from device_node
* @np: device_node with the properties
**/
static struct display_timing *of_get_display_timing(struct device_node *np)
static int of_parse_display_timing(struct device_node *np,
struct display_timing *dt)
{
struct display_timing *dt;
u32 val = 0;
int ret = 0;
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (!dt) {
pr_err("%s: could not allocate display_timing struct\n",
of_node_full_name(np));
return NULL;
}
memset(dt, 0, sizeof(*dt));
ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch);
ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch);
@ -101,13 +96,39 @@ static struct display_timing *of_get_display_timing(struct device_node *np)
if (ret) {
pr_err("%s: error reading timing properties\n",
of_node_full_name(np));
kfree(dt);
return NULL;
return -EINVAL;
}
return dt;
return 0;
}
/**
* of_get_display_timing - parse a display_timing entry
* @np: device_node with the timing subnode
* @name: name of the timing node
* @dt: display_timing struct to fill
**/
int of_get_display_timing(struct device_node *np, const char *name,
struct display_timing *dt)
{
struct device_node *timing_np;
if (!np) {
pr_err("%s: no devicenode given\n", of_node_full_name(np));
return -EINVAL;
}
timing_np = of_find_node_by_name(np, name);
if (!timing_np) {
pr_err("%s: could not find node '%s'\n",
of_node_full_name(np), name);
return -ENOENT;
}
return of_parse_display_timing(timing_np, dt);
}
EXPORT_SYMBOL_GPL(of_get_display_timing);
/**
* of_get_display_timings - parse all display_timing entries from a device_node
* @np: device_node with the subnodes
@ -174,9 +195,17 @@ struct display_timings *of_get_display_timings(struct device_node *np)
for_each_child_of_node(timings_np, entry) {
struct display_timing *dt;
int r;
dt = of_get_display_timing(entry);
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (!dt) {
pr_err("%s: could not allocate display_timing struct\n",
of_node_full_name(np));
goto timingfail;
}
r = of_parse_display_timing(entry, dt);
if (r) {
/*
* to not encourage wrong devicetrees, fail in case of
* an error

392
drivers/video/ssd1307fb.c
View File

@ -16,24 +16,50 @@
#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_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
#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;
};
struct ssd1307fb_array {
u8 type;
u8 data[0];
};
static struct fb_fix_screeninfo ssd1307fb_fix = {
@ -43,68 +69,87 @@ 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,
};
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)
{
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
@ -134,24 +179,23 @@ 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));
ssd1307fb_write_cmd(par->client, 0x00);
ssd1307fb_write_cmd(par->client, 0x10);
for (j = 0; j < SSD1307FB_WIDTH; j++) {
u8 buf = 0;
for (i = 0; i < (par->height / 8); i++) {
for (j = 0; j < par->width; j++) {
u32 array_idx = i * par->width + j;
array->data[array_idx] = 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);
buf |= bit << k;
array->data[array_idx] |= bit << k;
}
ssd1307fb_write_data(par->client, buf);
}
}
ssd1307fb_write_array(par->client, array, par->width * par->height / 8);
kfree(array);
}
@ -227,16 +271,167 @@ 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;
/* 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)
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 +442,31 @@ 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 +476,15 @@ 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 +498,6 @@ 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 +508,6 @@ 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 +516,25 @@ 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 +548,8 @@ 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 +557,12 @@ 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,

2
include/video/of_display_timing.h
View File

@ -14,6 +14,8 @@ struct display_timings;
#define OF_USE_NATIVE_MODE -1
int of_get_display_timing(struct device_node *np, const char *name,
struct display_timing *dt);
struct display_timings *of_get_display_timings(struct device_node *np);
int of_display_timings_exist(struct device_node *np);