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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>
hifive-unleashed-5.1
Kim, Milo 2012-03-23 15:02:09 -07:00 committed by Linus Torvalds
parent 3b49aacd0e
commit 011af7bc7c
3 changed files with 150 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
Documentation/leds/leds-lp5521.txt
View File

@ -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

102
drivers/leds/leds-lp5521.c
View File

@ -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++) {

11
include/linux/leds-lp5521.h
View File

@ -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 */