Commit 011af7bc authored by Kim, Milo's avatar Kim, Milo Committed by Linus Torvalds
Browse files

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: default avatarMilo(Woogyom) Kim <milo.kim@ti.com>
Acked-by: default avatarLinus 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3b49aacd

Documentation/leds/leds-lp5521.txt

+38 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/leds-lp5521.c

+101 −1
Original line number Diff line number Diff line
@@ -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++) {

include/linux/leds-lp5521.h

+11 −0
Original line number Diff line number Diff line
@@ -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 */

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