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

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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>
This commit is contained in:
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
Download Patch File Download Diff File Expand all files Collapse all files

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++) {