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Subject[PATCH] leds: lp5523: add master_fader support
Date
This patch introduces 4 new attributes:
master_fader_leds
master_fader1
master_fader2
master_fader3

Fo example, to map channel 0,6 to master_fader1,
map channel 1,7 to master_fader2,
map channel 2,8 to master_fader3, and
map channel 3,4,5 to none

echo "123000123" > master_fader_leds

A different factor can be set to each master_fader:

echo 255 > master_fader1
echo 100 > master_fader2
echo 0 > master_fader3

Signed-off-by: Toshi Kikuchi <toshik@chromium.org>
Acked-by: Milo Kim <milo.kim@ti.com>
---
drivers/leds/leds-lp5523.c | 148 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 148 insertions(+)

diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
index 4ade66a..a266f90 100644
--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -51,6 +51,7 @@
#define LP5523_REG_OP_MODE 0x01
#define LP5523_REG_ENABLE_LEDS_MSB 0x04
#define LP5523_REG_ENABLE_LEDS_LSB 0x05
+#define LP5523_REG_LED_CTRL_BASE 0x06
#define LP5523_REG_LED_PWM_BASE 0x16
#define LP5523_REG_LED_CURRENT_BASE 0x26
#define LP5523_REG_CONFIG 0x36
@@ -58,6 +59,7 @@
#define LP5523_REG_RESET 0x3D
#define LP5523_REG_LED_TEST_CTRL 0x41
#define LP5523_REG_LED_TEST_ADC 0x42
+#define LP5523_REG_MASTER_FADER_BASE 0x48
#define LP5523_REG_CH1_PROG_START 0x4C
#define LP5523_REG_CH2_PROG_START 0x4D
#define LP5523_REG_CH3_PROG_START 0x4E
@@ -79,6 +81,9 @@
#define LP5523_EXT_CLK_USED 0x08
#define LP5523_ENG_STATUS_MASK 0x07

+#define LP5523_FADER_MAPPING_MASK 0xC0
+#define LP5523_FADER_MAPPING_SHIFT 6
+
/* Memory Page Selection */
#define LP5523_PAGE_ENG1 0
#define LP5523_PAGE_ENG2 1
@@ -667,6 +672,137 @@ release_lock:
return pos;
}

+#define show_fader(nr) \
+static ssize_t show_master_fader##nr(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ return show_master_fader(dev, attr, buf, nr); \
+}
+
+#define store_fader(nr) \
+static ssize_t store_master_fader##nr(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ return store_master_fader(dev, attr, buf, len, nr); \
+}
+
+static ssize_t show_master_fader(struct device *dev,
+ struct device_attribute *attr,
+ char *buf, int nr)
+{
+ struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+ struct lp55xx_chip *chip = led->chip;
+ int ret;
+ u8 val;
+
+ mutex_lock(&chip->lock);
+ ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val);
+ mutex_unlock(&chip->lock);
+
+ if (ret == 0)
+ ret = sprintf(buf, "%u\n", val);
+
+ return ret;
+}
+show_fader(1)
+show_fader(2)
+show_fader(3)
+
+static ssize_t store_master_fader(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len, int nr)
+{
+ struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+ struct lp55xx_chip *chip = led->chip;
+ int ret;
+ unsigned long val;
+
+ if (kstrtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > 0xff)
+ return -EINVAL;
+
+ mutex_lock(&chip->lock);
+ ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1,
+ (u8)val);
+ mutex_unlock(&chip->lock);
+
+ if (ret == 0)
+ ret = len;
+
+ return ret;
+}
+store_fader(1)
+store_fader(2)
+store_fader(3)
+
+static ssize_t show_master_fader_leds(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+ struct lp55xx_chip *chip = led->chip;
+ int i, ret, pos = 0;
+ u8 val;
+
+ mutex_lock(&chip->lock);
+
+ for (i = 0; i < LP5523_MAX_LEDS; i++) {
+ ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val);
+ if (ret)
+ goto leave;
+
+ val = (val & LP5523_FADER_MAPPING_MASK)
+ >> LP5523_FADER_MAPPING_SHIFT;
+ if (val > 3) {
+ ret = -EINVAL;
+ goto leave;
+ }
+ buf[pos++] = val + '0';
+ }
+ buf[pos++] = '\n';
+ ret = pos;
+leave:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static ssize_t store_master_fader_leds(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+ struct lp55xx_chip *chip = led->chip;
+ int i, n, ret;
+ u8 val;
+
+ n = min_t(int, len, LP5523_MAX_LEDS);
+
+ mutex_lock(&chip->lock);
+
+ for (i = 0; i < n; i++) {
+ if (buf[i] >= '0' && buf[i] <= '3') {
+ val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT;
+ ret = lp55xx_update_bits(chip,
+ LP5523_REG_LED_CTRL_BASE + i,
+ LP5523_FADER_MAPPING_MASK,
+ val);
+ if (ret)
+ goto leave;
+ } else {
+ ret = -EINVAL;
+ goto leave;
+ }
+ }
+ ret = len;
+leave:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
static void lp5523_led_brightness_work(struct work_struct *work)
{
struct lp55xx_led *led = container_of(work, struct lp55xx_led,
@@ -689,6 +825,14 @@ static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
+static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
+ store_master_fader1);
+static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
+ store_master_fader2);
+static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
+ store_master_fader3);
+static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
+ store_master_fader_leds);

static struct attribute *lp5523_attributes[] = {
&dev_attr_engine1_mode.attr,
@@ -701,6 +845,10 @@ static struct attribute *lp5523_attributes[] = {
&dev_attr_engine2_leds.attr,
&dev_attr_engine3_leds.attr,
&dev_attr_selftest.attr,
+ &dev_attr_master_fader1.attr,
+ &dev_attr_master_fader2.attr,
+ &dev_attr_master_fader3.attr,
+ &dev_attr_master_fader_leds.attr,
NULL,
};

--
2.1.0


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