Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

‎ 3 Commits   0 Branches   0 Tags   |
Index
Trunk
Branches
Tags
Trunk
Branches
Tags
Home page
Home page
orangepi/linux-orangepi-5.10.y.git/trunk/drivers/leds/leds-an30259a.c
log
diff
blame
// 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>
 
#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 AN30259A_NAME "an30259a"
 
#define STATE_OFF 0
#define STATE_KEEP 1
#define STATE_ON 2
 
struct an30259a;
 
struct an30259a_led {
<------>struct an30259a *chip;
<------>struct fwnode_handle *fwnode;
<------>struct led_classdev cdev;
<------>u32 num;
<------>u32 default_state;
<------>bool sloping;
};
 
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 = dev_of_node(&client->dev), *child;
<------>int count, ret;
<------>int i = 0;
<------>const char *str;
<------>struct an30259a_led *led;
 
<------>count = of_get_available_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;
<------><------>led->fwnode = of_fwnode_handle(child);
 
<------><------>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;
<------><------>}
 
<------><------>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);
 
<------>if (IS_ERR(chip->regmap)) {
<------><------>err = PTR_ERR(chip->regmap);
<------><------>dev_err(&client->dev, "Failed to allocate register map: %d\n",
<------><------><------>err);
<------><------>goto exit;
<------>}
 
<------>for (i = 0; i < chip->num_leds; i++) {
<------><------>struct led_init_data init_data = {};
 
<------><------>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;
 
<------><------>init_data.fwnode = chip->leds[i].fwnode;
<------><------>init_data.devicename = AN30259A_NAME;
<------><------>init_data.default_label = ":";
 
<------><------>err = devm_led_classdev_register_ext(&client->dev,
<------><------><------><------><------><------> &chip->leds[i].cdev,
<------><------><------><------><------><------> &init_data);
<------><------>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-an30259a",
<------><------>.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("AN30259A LED driver");
MODULE_LICENSE("GPL v2");
log
diff
blame
cGit-ui™ 0.1.7
Git™ 2.40.0
Nginx™ 1.22.1

Where any material of this site is being reproduced, published or issued to others the reference to the source is obligatory.

© Andrey V. Kosteltsev, 2019 – 2025.