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authorKim, Milo <Milo.Kim@ti.com>2012-03-23 15:02:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:34 -0700
commit011af7bc7cd188a0310e2d26cdc2cc5d90148b0c (patch)
tree3f3aa08b555bdcb4c4dfe6e8d4bec9c4205ccd79
parent3b49aacd0e56d5bf1b511f6554f17cd65eb8da64 (diff)
downloadlinux-linaro-stable-011af7bc7cd188a0310e2d26cdc2cc5d90148b0c.tar.gz
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>
-rw-r--r--Documentation/leds/leds-lp5521.txt38
-rw-r--r--drivers/leds/leds-lp5521.c102
-rw-r--r--include/linux/leds-lp5521.h11
3 files changed, 150 insertions, 1 deletions
diff --git a/Documentation/leds/leds-lp5521.txt b/Documentation/leds/leds-lp5521.txt
index e3c66c64591d..0e542ab3d4a0 100644
--- 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 9682ece16011..007c7c921e7e 100644
--- 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 e9ab583cac36..3f071ec019b2 100644
--- 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 */