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- // SPDX-License-Identifier: GPL-2.0+
- //
- // Driver for Panasonic AN30259A 3-channel LED driver
- //
- // Copyright (c) 2018 Simon Shields <[email protected]>
- //
- // 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 void an30259a_remove(struct i2c_client *client)
- {
- struct an30259a *chip = i2c_get_clientdata(client);
- mutex_destroy(&chip->mutex);
- }
- 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 <[email protected]>");
- MODULE_DESCRIPTION("AN30259A LED driver");
- MODULE_LICENSE("GPL v2");
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