leds: add Panasonic AN30259A support
AN30259A is a 3-channel LED driver which uses I2C. It supports timed operation via an internal PWM clock, and variable brightness. This driver offers support for basic hardware-based blinking and brightness control. The datasheet is freely available: https://www.alliedelec.com/m/d/a9d2b3ee87c2d1a535a41dd747b1c247.pdf Signed-off-by: Simon Shields <simon@lineageos.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Simon Shields
Jacek Anaszewski
parent
86bc7b2d75
commit
2d00f35c55
|
|
@ -58,6 +58,16 @@ config LEDS_AAT1290
|
|||
help
|
||||
This option enables support for the LEDs on the AAT1290.
|
||||
|
||||
config LEDS_AN30259A
|
||||
tristate "LED support for Panasonic AN30259A"
|
||||
depends on LEDS_CLASS && I2C && OF
|
||||
help
|
||||
This option enables support for the AN30259A 3-channel
|
||||
LED driver.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called leds-an30259a.
|
||||
|
||||
config LEDS_APU
|
||||
tristate "Front panel LED support for PC Engines APU/APU2/APU3 boards"
|
||||
depends on LEDS_CLASS
|
||||
|
|
|
|||
|
|
@ -11,6 +11,7 @@ obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
|
|||
obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
|
||||
obj-$(CONFIG_LEDS_APU) += leds-apu.o
|
||||
obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
|
||||
obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o
|
||||
obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
|
||||
obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o
|
||||
obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
|
||||
|
|
|
|||
368
drivers/leds/leds-an30259a.c
Normal file
368
drivers/leds/leds-an30259a.c
Normal file
|
|
@ -0,0 +1,368 @@
|
|||
// SPDX-License-Identifier: GPL-2.0+
|
||||
//
|
||||
// Driver for Panasonic AN30259A 3-channel LED driver
|
||||
//
|
||||
// Copyright (c) 2018 Simon Shields <simon@lineageos.org>
|
||||
//
|
||||
// Datasheet:
|
||||
// https://www.alliedelec.com/m/d/a9d2b3ee87c2d1a535a41dd747b1c247.pdf
|
||||
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/leds.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <uapi/linux/uleds.h>
|
||||
|
||||
#define AN30259A_MAX_LEDS 3
|
||||
|
||||
#define AN30259A_REG_SRESET 0x00
|
||||
#define AN30259A_LED_SRESET BIT(0)
|
||||
|
||||
/* LED power registers */
|
||||
#define AN30259A_REG_LED_ON 0x01
|
||||
#define AN30259A_LED_EN(x) BIT((x) - 1)
|
||||
#define AN30259A_LED_SLOPE(x) BIT(((x) - 1) + 4)
|
||||
|
||||
#define AN30259A_REG_LEDCC(x) (0x03 + ((x) - 1))
|
||||
|
||||
/* slope control registers */
|
||||
#define AN30259A_REG_SLOPE(x) (0x06 + ((x) - 1))
|
||||
#define AN30259A_LED_SLOPETIME1(x) (x)
|
||||
#define AN30259A_LED_SLOPETIME2(x) ((x) << 4)
|
||||
|
||||
#define AN30259A_REG_LEDCNT1(x) (0x09 + (4 * ((x) - 1)))
|
||||
#define AN30259A_LED_DUTYMAX(x) ((x) << 4)
|
||||
#define AN30259A_LED_DUTYMID(x) (x)
|
||||
|
||||
#define AN30259A_REG_LEDCNT2(x) (0x0A + (4 * ((x) - 1)))
|
||||
#define AN30259A_LED_DELAY(x) ((x) << 4)
|
||||
#define AN30259A_LED_DUTYMIN(x) (x)
|
||||
|
||||
/* detention time control (length of each slope step) */
|
||||
#define AN30259A_REG_LEDCNT3(x) (0x0B + (4 * ((x) - 1)))
|
||||
#define AN30259A_LED_DT1(x) (x)
|
||||
#define AN30259A_LED_DT2(x) ((x) << 4)
|
||||
|
||||
#define AN30259A_REG_LEDCNT4(x) (0x0C + (4 * ((x) - 1)))
|
||||
#define AN30259A_LED_DT3(x) (x)
|
||||
#define AN30259A_LED_DT4(x) ((x) << 4)
|
||||
|
||||
#define AN30259A_REG_MAX 0x14
|
||||
|
||||
#define AN30259A_BLINK_MAX_TIME 7500 /* ms */
|
||||
#define AN30259A_SLOPE_RESOLUTION 500 /* ms */
|
||||
|
||||
#define STATE_OFF 0
|
||||
#define STATE_KEEP 1
|
||||
#define STATE_ON 2
|
||||
|
||||
struct an30259a;
|
||||
|
||||
struct an30259a_led {
|
||||
struct an30259a *chip;
|
||||
struct led_classdev cdev;
|
||||
u32 num;
|
||||
u32 default_state;
|
||||
bool sloping;
|
||||
char label[LED_MAX_NAME_SIZE];
|
||||
};
|
||||
|
||||
struct an30259a {
|
||||
struct mutex mutex; /* held when writing to registers */
|
||||
struct i2c_client *client;
|
||||
struct an30259a_led leds[AN30259A_MAX_LEDS];
|
||||
struct regmap *regmap;
|
||||
int num_leds;
|
||||
};
|
||||
|
||||
static int an30259a_brightness_set(struct led_classdev *cdev,
|
||||
enum led_brightness brightness)
|
||||
{
|
||||
struct an30259a_led *led;
|
||||
int ret;
|
||||
unsigned int led_on;
|
||||
|
||||
led = container_of(cdev, struct an30259a_led, cdev);
|
||||
mutex_lock(&led->chip->mutex);
|
||||
|
||||
ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
switch (brightness) {
|
||||
case LED_OFF:
|
||||
led_on &= ~AN30259A_LED_EN(led->num);
|
||||
led_on &= ~AN30259A_LED_SLOPE(led->num);
|
||||
led->sloping = false;
|
||||
break;
|
||||
default:
|
||||
led_on |= AN30259A_LED_EN(led->num);
|
||||
if (led->sloping)
|
||||
led_on |= AN30259A_LED_SLOPE(led->num);
|
||||
ret = regmap_write(led->chip->regmap,
|
||||
AN30259A_REG_LEDCNT1(led->num),
|
||||
AN30259A_LED_DUTYMAX(0xf) |
|
||||
AN30259A_LED_DUTYMID(0xf));
|
||||
if (ret)
|
||||
goto error;
|
||||
break;
|
||||
}
|
||||
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCC(led->num),
|
||||
brightness);
|
||||
|
||||
error:
|
||||
mutex_unlock(&led->chip->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int an30259a_blink_set(struct led_classdev *cdev,
|
||||
unsigned long *delay_off, unsigned long *delay_on)
|
||||
{
|
||||
struct an30259a_led *led;
|
||||
int ret, num;
|
||||
unsigned int led_on;
|
||||
unsigned long off = *delay_off, on = *delay_on;
|
||||
|
||||
led = container_of(cdev, struct an30259a_led, cdev);
|
||||
|
||||
mutex_lock(&led->chip->mutex);
|
||||
num = led->num;
|
||||
|
||||
/* slope time can only be a multiple of 500ms. */
|
||||
if (off % AN30259A_SLOPE_RESOLUTION || on % AN30259A_SLOPE_RESOLUTION) {
|
||||
ret = -EINVAL;
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* up to a maximum of 7500ms. */
|
||||
if (off > AN30259A_BLINK_MAX_TIME || on > AN30259A_BLINK_MAX_TIME) {
|
||||
ret = -EINVAL;
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* if no blink specified, default to 1 Hz. */
|
||||
if (!off && !on) {
|
||||
*delay_off = off = 500;
|
||||
*delay_on = on = 500;
|
||||
}
|
||||
|
||||
/* convert into values the HW will understand. */
|
||||
off /= AN30259A_SLOPE_RESOLUTION;
|
||||
on /= AN30259A_SLOPE_RESOLUTION;
|
||||
|
||||
/* duty min should be zero (=off), delay should be zero. */
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT2(num),
|
||||
AN30259A_LED_DELAY(0) | AN30259A_LED_DUTYMIN(0));
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
/* reset detention time (no "breathing" effect). */
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT3(num),
|
||||
AN30259A_LED_DT1(0) | AN30259A_LED_DT2(0));
|
||||
if (ret)
|
||||
goto error;
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT4(num),
|
||||
AN30259A_LED_DT3(0) | AN30259A_LED_DT4(0));
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
/* slope time controls on/off cycle length. */
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_SLOPE(num),
|
||||
AN30259A_LED_SLOPETIME1(off) |
|
||||
AN30259A_LED_SLOPETIME2(on));
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
/* Finally, enable slope mode. */
|
||||
ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
led_on |= AN30259A_LED_SLOPE(num) | AN30259A_LED_EN(led->num);
|
||||
|
||||
ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);
|
||||
|
||||
if (!ret)
|
||||
led->sloping = true;
|
||||
error:
|
||||
mutex_unlock(&led->chip->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int an30259a_dt_init(struct i2c_client *client,
|
||||
struct an30259a *chip)
|
||||
{
|
||||
struct device_node *np = client->dev.of_node, *child;
|
||||
int count, ret;
|
||||
int i = 0;
|
||||
const char *str;
|
||||
struct an30259a_led *led;
|
||||
|
||||
count = of_get_child_count(np);
|
||||
if (!count || count > AN30259A_MAX_LEDS)
|
||||
return -EINVAL;
|
||||
|
||||
for_each_available_child_of_node(np, child) {
|
||||
u32 source;
|
||||
|
||||
ret = of_property_read_u32(child, "reg", &source);
|
||||
if (ret != 0 || !source || source > AN30259A_MAX_LEDS) {
|
||||
dev_err(&client->dev, "Couldn't read LED address: %d\n",
|
||||
ret);
|
||||
count--;
|
||||
continue;
|
||||
}
|
||||
|
||||
led = &chip->leds[i];
|
||||
|
||||
led->num = source;
|
||||
led->chip = chip;
|
||||
|
||||
if (of_property_read_string(child, "label", &str))
|
||||
snprintf(led->label, sizeof(led->label), "an30259a::");
|
||||
else
|
||||
snprintf(led->label, sizeof(led->label), "an30259a:%s",
|
||||
str);
|
||||
|
||||
led->cdev.name = led->label;
|
||||
|
||||
if (!of_property_read_string(child, "default-state", &str)) {
|
||||
if (!strcmp(str, "on"))
|
||||
led->default_state = STATE_ON;
|
||||
else if (!strcmp(str, "keep"))
|
||||
led->default_state = STATE_KEEP;
|
||||
else
|
||||
led->default_state = STATE_OFF;
|
||||
}
|
||||
|
||||
of_property_read_string(child, "linux,default-trigger",
|
||||
&led->cdev.default_trigger);
|
||||
|
||||
i++;
|
||||
}
|
||||
|
||||
if (!count)
|
||||
return -EINVAL;
|
||||
|
||||
chip->num_leds = i;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct regmap_config an30259a_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
.max_register = AN30259A_REG_MAX,
|
||||
};
|
||||
|
||||
static void an30259a_init_default_state(struct an30259a_led *led)
|
||||
{
|
||||
struct an30259a *chip = led->chip;
|
||||
int led_on, err;
|
||||
|
||||
switch (led->default_state) {
|
||||
case STATE_ON:
|
||||
led->cdev.brightness = LED_FULL;
|
||||
break;
|
||||
case STATE_KEEP:
|
||||
err = regmap_read(chip->regmap, AN30259A_REG_LED_ON, &led_on);
|
||||
if (err)
|
||||
break;
|
||||
|
||||
if (!(led_on & AN30259A_LED_EN(led->num))) {
|
||||
led->cdev.brightness = LED_OFF;
|
||||
break;
|
||||
}
|
||||
regmap_read(chip->regmap, AN30259A_REG_LEDCC(led->num),
|
||||
&led->cdev.brightness);
|
||||
break;
|
||||
default:
|
||||
led->cdev.brightness = LED_OFF;
|
||||
}
|
||||
|
||||
an30259a_brightness_set(&led->cdev, led->cdev.brightness);
|
||||
}
|
||||
|
||||
static int an30259a_probe(struct i2c_client *client)
|
||||
{
|
||||
struct an30259a *chip;
|
||||
int i, err;
|
||||
|
||||
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
||||
if (!chip)
|
||||
return -ENOMEM;
|
||||
|
||||
err = an30259a_dt_init(client, chip);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
mutex_init(&chip->mutex);
|
||||
chip->client = client;
|
||||
i2c_set_clientdata(client, chip);
|
||||
|
||||
chip->regmap = devm_regmap_init_i2c(client, &an30259a_regmap_config);
|
||||
|
||||
for (i = 0; i < chip->num_leds; i++) {
|
||||
an30259a_init_default_state(&chip->leds[i]);
|
||||
chip->leds[i].cdev.brightness_set_blocking =
|
||||
an30259a_brightness_set;
|
||||
chip->leds[i].cdev.blink_set = an30259a_blink_set;
|
||||
|
||||
err = devm_led_classdev_register(&client->dev,
|
||||
&chip->leds[i].cdev);
|
||||
if (err < 0)
|
||||
goto exit;
|
||||
}
|
||||
return 0;
|
||||
|
||||
exit:
|
||||
mutex_destroy(&chip->mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int an30259a_remove(struct i2c_client *client)
|
||||
{
|
||||
struct an30259a *chip = i2c_get_clientdata(client);
|
||||
|
||||
mutex_destroy(&chip->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id an30259a_match_table[] = {
|
||||
{ .compatible = "panasonic,an30259a", },
|
||||
{ /* sentinel */ },
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(of, an30259a_match_table);
|
||||
|
||||
static const struct i2c_device_id an30259a_id[] = {
|
||||
{ "an30259a", 0 },
|
||||
{ /* sentinel */ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, an30259a_id);
|
||||
|
||||
static struct i2c_driver an30259a_driver = {
|
||||
.driver = {
|
||||
.name = "leds-an32059a",
|
||||
.of_match_table = of_match_ptr(an30259a_match_table),
|
||||
},
|
||||
.probe_new = an30259a_probe,
|
||||
.remove = an30259a_remove,
|
||||
.id_table = an30259a_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(an30259a_driver);
|
||||
|
||||
MODULE_AUTHOR("Simon Shields <simon@lineageos.org>");
|
||||
MODULE_DESCRIPTION("AN32059A LED driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user