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path: root/drivers/video/backlight/lp855x_bl.c
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Diffstat (limited to 'drivers/video/backlight/lp855x_bl.c')
-rw-r--r--drivers/video/backlight/lp855x_bl.c105
1 files changed, 90 insertions, 15 deletions
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 7ae9ae6f465..a0e1e02bdc2 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -14,6 +14,7 @@
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/err.h>
+#include <linux/of.h>
#include <linux/platform_data/lp855x.h>
#include <linux/pwm.h>
@@ -35,10 +36,14 @@
#define LP8557_EPROM_START 0x10
#define LP8557_EPROM_END 0x1E
-#define BUF_SIZE 20
#define DEFAULT_BL_NAME "lcd-backlight"
#define MAX_BRIGHTNESS 255
+enum lp855x_brightness_ctrl_mode {
+ PWM_BASED = 1,
+ REGISTER_BASED,
+};
+
struct lp855x;
/*
@@ -58,6 +63,7 @@ struct lp855x_device_config {
struct lp855x {
const char *chipname;
enum lp855x_chip_id chip_id;
+ enum lp855x_brightness_ctrl_mode mode;
struct lp855x_device_config *cfg;
struct i2c_client *client;
struct backlight_device *bl;
@@ -187,7 +193,7 @@ static int lp855x_configure(struct lp855x *lp)
if (ret)
goto err;
- if (pd->load_new_rom_data && pd->size_program) {
+ if (pd->size_program > 0) {
for (i = 0; i < pd->size_program; i++) {
addr = pd->rom_data[i].addr;
val = pd->rom_data[i].val;
@@ -239,18 +245,17 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
- enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
if (bl->props.state & BL_CORE_SUSPENDED)
bl->props.brightness = 0;
- if (mode == PWM_BASED) {
+ if (lp->mode == PWM_BASED) {
int br = bl->props.brightness;
int max_br = bl->props.max_brightness;
lp855x_pwm_ctrl(lp, br, max_br);
- } else if (mode == REGISTER_BASED) {
+ } else if (lp->mode == REGISTER_BASED) {
u8 val = bl->props.brightness;
lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
}
@@ -274,7 +279,7 @@ static int lp855x_backlight_register(struct lp855x *lp)
struct backlight_device *bl;
struct backlight_properties props;
struct lp855x_platform_data *pdata = lp->pdata;
- char *name = pdata->name ? : DEFAULT_BL_NAME;
+ const char *name = pdata->name ? : DEFAULT_BL_NAME;
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = MAX_BRIGHTNESS;
@@ -304,22 +309,21 @@ static ssize_t lp855x_get_chip_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp855x *lp = dev_get_drvdata(dev);
- return scnprintf(buf, BUF_SIZE, "%s\n", lp->chipname);
+ return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
}
static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp855x *lp = dev_get_drvdata(dev);
- enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
char *strmode = NULL;
- if (mode == PWM_BASED)
+ if (lp->mode == PWM_BASED)
strmode = "pwm based";
- else if (mode == REGISTER_BASED)
+ else if (lp->mode == REGISTER_BASED)
strmode = "register based";
- return scnprintf(buf, BUF_SIZE, "%s\n", strmode);
+ return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
}
static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
@@ -335,16 +339,71 @@ static const struct attribute_group lp855x_attr_group = {
.attrs = lp855x_attributes,
};
+#ifdef CONFIG_OF
+static int lp855x_parse_dt(struct device *dev, struct device_node *node)
+{
+ struct lp855x_platform_data *pdata;
+ int rom_length;
+
+ if (!node) {
+ dev_err(dev, "no platform data\n");
+ return -EINVAL;
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ of_property_read_string(node, "bl-name", &pdata->name);
+ of_property_read_u8(node, "dev-ctrl", &pdata->device_control);
+ of_property_read_u8(node, "init-brt", &pdata->initial_brightness);
+ of_property_read_u32(node, "pwm-period", &pdata->period_ns);
+
+ /* Fill ROM platform data if defined */
+ rom_length = of_get_child_count(node);
+ if (rom_length > 0) {
+ struct lp855x_rom_data *rom;
+ struct device_node *child;
+ int i = 0;
+
+ rom = devm_kzalloc(dev, sizeof(*rom) * rom_length, GFP_KERNEL);
+ if (!rom)
+ return -ENOMEM;
+
+ for_each_child_of_node(node, child) {
+ of_property_read_u8(child, "rom-addr", &rom[i].addr);
+ of_property_read_u8(child, "rom-val", &rom[i].val);
+ i++;
+ }
+
+ pdata->size_program = rom_length;
+ pdata->rom_data = &rom[0];
+ }
+
+ dev->platform_data = pdata;
+
+ return 0;
+}
+#else
+static int lp855x_parse_dt(struct device *dev, struct device_node *node)
+{
+ return -EINVAL;
+}
+#endif
+
static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
struct lp855x *lp;
struct lp855x_platform_data *pdata = cl->dev.platform_data;
- enum lp855x_brightness_ctrl_mode mode;
+ struct device_node *node = cl->dev.of_node;
int ret;
if (!pdata) {
- dev_err(&cl->dev, "no platform data supplied\n");
- return -EINVAL;
+ ret = lp855x_parse_dt(&cl->dev, node);
+ if (ret < 0)
+ return ret;
+
+ pdata = cl->dev.platform_data;
}
if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
@@ -354,7 +413,11 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
if (!lp)
return -ENOMEM;
- mode = pdata->mode;
+ if (pdata->period_ns > 0)
+ lp->mode = PWM_BASED;
+ else
+ lp->mode = REGISTER_BASED;
+
lp->client = cl;
lp->dev = &cl->dev;
lp->pdata = pdata;
@@ -402,6 +465,17 @@ static int lp855x_remove(struct i2c_client *cl)
return 0;
}
+static const struct of_device_id lp855x_dt_ids[] = {
+ { .compatible = "ti,lp8550", },
+ { .compatible = "ti,lp8551", },
+ { .compatible = "ti,lp8552", },
+ { .compatible = "ti,lp8553", },
+ { .compatible = "ti,lp8556", },
+ { .compatible = "ti,lp8557", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, lp855x_dt_ids);
+
static const struct i2c_device_id lp855x_ids[] = {
{"lp8550", LP8550},
{"lp8551", LP8551},
@@ -416,6 +490,7 @@ MODULE_DEVICE_TABLE(i2c, lp855x_ids);
static struct i2c_driver lp855x_driver = {
.driver = {
.name = "lp855x",
+ .of_match_table = of_match_ptr(lp855x_dt_ids),
},
.probe = lp855x_probe,
.remove = lp855x_remove,