static int blinkm_led_common_set(struct led_classdev *led_cdev,
enum led_brightness value, int color)
{
/* led_brightness is 0, 127 or 255 - we just use it here as-is */
struct blinkm_led *led = cdev_to_blmled(led_cdev);
struct blinkm_data *data = i2c_get_clientdata(led->i2c_client);
switch (color) {
case RED:
/* bail out if there's no change */
if (data->next_red == (u8) value)
return 0;
data->next_red = (u8) value;
break;
case GREEN:
/* bail out if there's no change */
if (data->next_green == (u8) value)
return 0;
data->next_green = (u8) value;
break;
case BLUE:
/* bail out if there's no change */
if (data->next_blue == (u8) value)
return 0;
data->next_blue = (u8) value;
break;
default:
dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n");
return -EINVAL;
}
blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB);
dev_dbg(&led->i2c_client->dev,
"# DONE # next_red = %d, next_green = %d,"
" next_blue = %d\n",
data->next_red, data->next_green,
data->next_blue);
return 0;
}
static int blinkm_led_common_set(struct led_classdev *led_cdev,
enum led_brightness value, int color)
{
/* led_brightness is 0, 127 or 255 - we just use it here as-is */
struct blinkm_led *led = cdev_to_blmled(led_cdev);
struct blinkm_data *data = i2c_get_clientdata(led->i2c_client);
struct blinkm_work *bl_work;
switch (color) {
case RED:
/* bail out if there's no change */
if (data->next_red == (u8) value)
return 0;
/* we assume a quite fast sequence here ([off]->on->off)
* think of network led trigger - we cannot blink that fast, so
* in case we already have a off->on->off transition queued up,
* we refuse to queue up more.
* Revisit: fast-changing brightness. */
if (atomic_read(&led->active) > 1)
return 0;
data->next_red = (u8) value;
break;
case GREEN:
/* bail out if there's no change */
if (data->next_green == (u8) value)
return 0;
/* we assume a quite fast sequence here ([off]->on->off)
* Revisit: fast-changing brightness. */
if (atomic_read(&led->active) > 1)
return 0;
data->next_green = (u8) value;
break;
case BLUE:
/* bail out if there's no change */
if (data->next_blue == (u8) value)
return 0;
/* we assume a quite fast sequence here ([off]->on->off)
* Revisit: fast-changing brightness. */
if (atomic_read(&led->active) > 1)
return 0;
data->next_blue = (u8) value;
break;
default:
dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n");
return -EINVAL;
}
bl_work = kzalloc(sizeof(*bl_work), GFP_ATOMIC);
if (!bl_work)
return -ENOMEM;
atomic_inc(&led->active);
dev_dbg(&led->i2c_client->dev,
"#TO_SCHED# next_red = %d, next_green = %d,"
" next_blue = %d, active = %d\n",
data->next_red, data->next_green,
data->next_blue, atomic_read(&led->active));
/* a fresh work _item_ for each change */
bl_work->blinkm_led = led;
INIT_WORK(&bl_work->work, led_work);
/* queue work in own queue for easy sync on exit*/
schedule_work(&bl_work->work);
return 0;
}
