From 011af7bc7cd188a0310e2d26cdc2cc5d90148b0c Mon Sep 17 00:00:00 2001 From: "Kim, Milo" Date: Fri, 23 Mar 2012 15:02:09 -0700 Subject: [PATCH] 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 Acked-by: Linus Walleij Cc: Arun MURTHY Cc: Srinidhi Kasagar Cc: Richard Purdie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/leds/leds-lp5521.txt | 38 +++++++++++ drivers/leds/leds-lp5521.c | 102 ++++++++++++++++++++++++++++- include/linux/leds-lp5521.h | 11 ++++ 3 files changed, 150 insertions(+), 1 deletion(-) 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 */