drivers/leds/leds-lp5521.c: support led pattern data

The lp5521 has autonomous operation mode without external control.
Using lp5521_platform_data, various led patterns can be configurable.
For supporting this feature, new functions and device attribute are
added.

Structure of lp5521_led_pattern: 3 channels are supported - red, green
and blue.  Pattern(s) of each channel and numbers of pattern(s) are
defined in the pla= tform data.  Pattern data are hexa codes which
include pattern commands such like set pwm, wait, ramp up/down, branch
and so on.

Pattern mode functions:
 * lp5521_clear_program_memory
	Before running new led pattern, program memory should be cleared.
 * lp5521_write_program_memory
	Pattern data updated in the program memory via the i2c.
 * lp5521_get_pattern
	Get pattern from predefined in the platform data.
 * lp5521_run_led_pattern
	Stop current pattern or run new pattern.
	Transition time is required between different operation mode.

Device attribute - 'led_pattern': To load specific led pattern, new device
attribute is added.

When the lp5521 driver is unloaded, stop current led pattern mode.

Documentation updated : description about how to define the led patterns
and example.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Arun MURTHY <arun.murthy@stericsson.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/leds/leds-lp5521.txt b/Documentation/leds/leds-lp5521.txt
index e3c66c6..0e542ab 100644 (file)
--- a/Documentation/leds/leds-lp5521.txt
+++ b/Documentation/leds/leds-lp5521.txt
@@ -111,3 +111,41 @@ static struct lp5521_platform_data lp5521_pdata = {
        .clock_mode = LP5521_CLOCK_INT,
        .update_config = LP5521_CONFIGS,
 };
+
+LED patterns : LP5521 has autonomous operation without external control.
+Pattern data can be defined in the platform data.
+
+example of led pattern data :
+
+/* RGB(50,5,0) 500ms on, 500ms off, infinite loop */
+static u8 pattern_red[] = {
+               0x40, 0x32, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
+               };
+
+static u8 pattern_green[] = {
+               0x40, 0x05, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
+               };
+
+static struct lp5521_led_pattern board_led_patterns[] = {
+       {
+               .r = pattern_red,
+               .g = pattern_green,
+               .size_r = ARRAY_SIZE(pattern_red),
+               .size_g = ARRAY_SIZE(pattern_green),
+       },
+};
+
+static struct lp5521_platform_data lp5521_platform_data = {
+        .led_config     = lp5521_led_config,
+        .num_channels   = ARRAY_SIZE(lp5521_led_config),
+        .clock_mode     = LP5521_CLOCK_EXT,
+       .patterns = board_led_patterns,
+       .num_patterns = ARRAY_SIZE(board_led_patterns),
+};
+
+Then predefined led pattern(s) can be executed via the sysfs.
+To start the pattern #1,
+# echo 1 > /sys/bus/i2c/devices/xxxx/led_pattern
+(xxxx : i2c bus & slave address)
+To end the pattern,
+# echo 0 > /sys/bus/i2c/devices/xxxx/led_pattern

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 9682ece..007c7c9 100644 (file)
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -88,6 +88,9 @@
 /* default R channel current register value */
 #define LP5521_REG_R_CURR_DEFAULT      0xAF
 
+/* Pattern Mode */
+#define PATTERN_OFF    0
+
 struct lp5521_engine {
        int             id;
        u8              mode;
@@ -493,7 +496,7 @@ static ssize_t store_current(struct device *dev,
        ssize_t ret;
        unsigned long curr;
 
-       if (strict_strtoul(buf, 0, &curr))
+       if (kstrtoul(buf, 0, &curr))
                return -EINVAL;
 
        if (curr > led->max_current)
@@ -525,6 +528,100 @@ static ssize_t lp5521_selftest(struct device *dev,
        return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
 }
 
+static void lp5521_clear_program_memory(struct i2c_client *cl)
+{
+       int i;
+       u8 rgb_mem[] = {
+               LP5521_REG_R_PROG_MEM,
+               LP5521_REG_G_PROG_MEM,
+               LP5521_REG_B_PROG_MEM,
+       };
+
+       for (i = 0; i < ARRAY_SIZE(rgb_mem); i++) {
+               lp5521_write(cl, rgb_mem[i], 0);
+               lp5521_write(cl, rgb_mem[i] + 1, 0);
+       }
+}
+
+static void lp5521_write_program_memory(struct i2c_client *cl,
+                               u8 base, u8 *rgb, int size)
+{
+       int i;
+
+       if (!rgb || size <= 0)
+               return;
+
+       for (i = 0; i < size; i++)
+               lp5521_write(cl, base + i, *(rgb + i));
+
+       lp5521_write(cl, base + i, 0);
+       lp5521_write(cl, base + i + 1, 0);
+}
+
+static inline struct lp5521_led_pattern *lp5521_get_pattern
+                                       (struct lp5521_chip *chip, u8 offset)
+{
+       struct lp5521_led_pattern *ptn;
+       ptn = chip->pdata->patterns + (offset - 1);
+       return ptn;
+}
+
+static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
+{
+       struct lp5521_led_pattern *ptn;
+       struct i2c_client *cl = chip->client;
+       int num_patterns = chip->pdata->num_patterns;
+
+       if (mode > num_patterns || !(chip->pdata->patterns))
+               return;
+
+       if (mode == PATTERN_OFF) {
+               lp5521_write(cl, LP5521_REG_ENABLE,
+                       LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
+               usleep_range(1000, 2000);
+               lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
+       } else {
+               ptn = lp5521_get_pattern(chip, mode);
+               if (!ptn)
+                       return;
+
+               lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
+               usleep_range(1000, 2000);
+
+               lp5521_clear_program_memory(cl);
+
+               lp5521_write_program_memory(cl, LP5521_REG_R_PROG_MEM,
+                                       ptn->r, ptn->size_r);
+               lp5521_write_program_memory(cl, LP5521_REG_G_PROG_MEM,
+                                       ptn->g, ptn->size_g);
+               lp5521_write_program_memory(cl, LP5521_REG_B_PROG_MEM,
+                                       ptn->b, ptn->size_b);
+
+               lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN);
+               usleep_range(1000, 2000);
+               lp5521_write(cl, LP5521_REG_ENABLE,
+                       LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
+                       LP5521_EXEC_RUN);
+       }
+}
+
+static ssize_t store_led_pattern(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf, size_t len)
+{
+       struct lp5521_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
+       unsigned long val;
+       int ret;
+
+       ret = strict_strtoul(buf, 16, &val);
+       if (ret)
+               return ret;
+
+       lp5521_run_led_pattern(val, chip);
+
+       return len;
+}
+
 /* led class device attributes */
 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
@@ -550,6 +647,7 @@ static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
 static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
+static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, store_led_pattern);
 
 static struct attribute *lp5521_attributes[] = {
        &dev_attr_engine1_mode.attr,
@@ -559,6 +657,7 @@ static struct attribute *lp5521_attributes[] = {
        &dev_attr_engine1_load.attr,
        &dev_attr_engine2_load.attr,
        &dev_attr_engine3_load.attr,
+       &dev_attr_led_pattern.attr,
        NULL
 };
 
@@ -761,6 +860,7 @@ static int __devexit lp5521_remove(struct i2c_client *client)
        struct lp5521_chip *chip = i2c_get_clientdata(client);
        int i;
 
+       lp5521_run_led_pattern(PATTERN_OFF, chip);
        lp5521_unregister_sysfs(client);
 
        for (i = 0; i < chip->num_leds; i++) {

diff --git a/include/linux/leds-lp5521.h b/include/linux/leds-lp5521.h
index e9ab583..3f071ec 100644 (file)
--- a/include/linux/leds-lp5521.h
+++ b/include/linux/leds-lp5521.h
@@ -32,6 +32,15 @@ struct lp5521_led_config {
        u8              max_current;
 };
 
+struct lp5521_led_pattern {
+       u8 *r;
+       u8 *g;
+       u8 *b;
+       u8 size_r;
+       u8 size_g;
+       u8 size_b;
+};
+
 #define LP5521_CLOCK_AUTO      0
 #define LP5521_CLOCK_INT       1
 #define LP5521_CLOCK_EXT       2
@@ -57,6 +66,8 @@ struct lp5521_platform_data {
        void    (*enable)(bool state);
        const char *label;
        u8      update_config;
+       struct lp5521_led_pattern *patterns;
+       int num_patterns;
 };
 
 #endif /* __LINUX_LP5521_H */