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leds: add the sysfs interface into the leds-bd2802 driver for changin…
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…g wave pattern and led current.

Allow the user application to change the wave pattern and led current by
'wave_pattern' and 'rgb_current' sysfs files.

Signed-off-by: Kim Kyuwon <q1.kim@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
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Kim Kyuwon authored and Richard Purdie committed Jun 23, 2009
1 parent 1b18cf4 commit 8792f7c
Showing 1 changed file with 73 additions and 13 deletions.
86 changes: 73 additions & 13 deletions drivers/leds/leds-bd2802.c
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Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,10 @@ struct bd2802_led {
enum led_ids led_id;
enum led_colors color;
enum led_bits state;

/* General attributes of RGB LEDs */
int wave_pattern;
int rgb_current;
};


Expand Down Expand Up @@ -254,7 +258,7 @@ static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
bd2802_reset_cancel(led);

reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
bd2802_write_byte(led->client, reg, led->rgb_current);
reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
Expand All @@ -275,9 +279,9 @@ static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
bd2802_write_byte(led->client, reg, led->rgb_current);
reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
bd2802_write_byte(led->client, reg, BD2802_PATTERN_HALF);
bd2802_write_byte(led->client, reg, led->wave_pattern);

bd2802_enable(led, id);
bd2802_update_state(led, id, color, BD2802_BLINK);
Expand Down Expand Up @@ -406,7 +410,7 @@ static void bd2802_enable_adv_conf(struct bd2802_led *led)
ret = device_create_file(&led->client->dev,
bd2802_addr_attributes[i]);
if (ret) {
dev_err(&led->client->dev, "failed to sysfs file %s\n",
dev_err(&led->client->dev, "failed: sysfs file %s\n",
bd2802_addr_attributes[i]->attr.name);
goto failed_remove_files;
}
Expand Down Expand Up @@ -483,6 +487,52 @@ static struct device_attribute bd2802_adv_conf_attr = {
.store = bd2802_store_adv_conf,
};

#define BD2802_CONTROL_ATTR(attr_name, name_str) \
static ssize_t bd2802_show_##attr_name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
ssize_t ret; \
down_read(&led->rwsem); \
ret = sprintf(buf, "0x%02x\n", led->attr_name); \
up_read(&led->rwsem); \
return ret; \
} \
static ssize_t bd2802_store_##attr_name(struct device *dev, \
struct device_attribute *attr, const char *buf, size_t count) \
{ \
struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
unsigned long val; \
int ret; \
if (!count) \
return -EINVAL; \
ret = strict_strtoul(buf, 16, &val); \
if (ret) \
return ret; \
down_write(&led->rwsem); \
led->attr_name = val; \
up_write(&led->rwsem); \
return count; \
} \
static struct device_attribute bd2802_##attr_name##_attr = { \
.attr = { \
.name = name_str, \
.mode = 0644, \
.owner = THIS_MODULE \
}, \
.show = bd2802_show_##attr_name, \
.store = bd2802_store_##attr_name, \
};

BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
BD2802_CONTROL_ATTR(rgb_current, "rgb_current");

static struct device_attribute *bd2802_attributes[] = {
&bd2802_adv_conf_attr,
&bd2802_wave_pattern_attr,
&bd2802_rgb_current_attr,
};

static void bd2802_led_work(struct work_struct *work)
{
struct bd2802_led *led = container_of(work, struct bd2802_led, work);
Expand Down Expand Up @@ -635,7 +685,7 @@ static int __devinit bd2802_probe(struct i2c_client *client,
{
struct bd2802_led *led;
struct bd2802_led_platform_data *pdata;
int ret;
int ret, i;

led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
if (!led) {
Expand Down Expand Up @@ -665,13 +715,20 @@ static int __devinit bd2802_probe(struct i2c_client *client,
/* To save the power, reset BD2802 after detecting */
gpio_set_value(led->pdata->reset_gpio, 0);

/* Default attributes */
led->wave_pattern = BD2802_PATTERN_HALF;
led->rgb_current = BD2802_CURRENT_032;

init_rwsem(&led->rwsem);

ret = device_create_file(&client->dev, &bd2802_adv_conf_attr);
if (ret) {
dev_err(&client->dev, "failed to create sysfs file %s\n",
bd2802_adv_conf_attr.attr.name);
goto failed_free;
for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
ret = device_create_file(&led->client->dev,
bd2802_attributes[i]);
if (ret) {
dev_err(&led->client->dev, "failed: sysfs file %s\n",
bd2802_attributes[i]->attr.name);
goto failed_unregister_dev_file;
}
}

ret = bd2802_register_led_classdev(led);
Expand All @@ -681,7 +738,8 @@ static int __devinit bd2802_probe(struct i2c_client *client,
return 0;

failed_unregister_dev_file:
device_remove_file(&client->dev, &bd2802_adv_conf_attr);
for (i--; i >= 0; i--)
device_remove_file(&led->client->dev, bd2802_attributes[i]);
failed_free:
i2c_set_clientdata(client, NULL);
kfree(led);
Expand All @@ -692,12 +750,14 @@ static int __devinit bd2802_probe(struct i2c_client *client,
static int __exit bd2802_remove(struct i2c_client *client)
{
struct bd2802_led *led = i2c_get_clientdata(client);
int i;

bd2802_unregister_led_classdev(led);
gpio_set_value(led->pdata->reset_gpio, 0);
bd2802_unregister_led_classdev(led);
if (led->adf_on)
bd2802_disable_adv_conf(led);
device_remove_file(&client->dev, &bd2802_adv_conf_attr);
for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
device_remove_file(&led->client->dev, bd2802_attributes[i]);
i2c_set_clientdata(client, NULL);
kfree(led);

Expand Down

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