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2d00f35c55
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>
369 lines
8.6 KiB
C
369 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Driver for Panasonic AN30259A 3-channel LED driver
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//
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// Copyright (c) 2018 Simon Shields <simon@lineageos.org>
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//
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// Datasheet:
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// https://www.alliedelec.com/m/d/a9d2b3ee87c2d1a535a41dd747b1c247.pdf
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <uapi/linux/uleds.h>
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#define AN30259A_MAX_LEDS 3
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#define AN30259A_REG_SRESET 0x00
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#define AN30259A_LED_SRESET BIT(0)
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/* LED power registers */
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#define AN30259A_REG_LED_ON 0x01
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#define AN30259A_LED_EN(x) BIT((x) - 1)
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#define AN30259A_LED_SLOPE(x) BIT(((x) - 1) + 4)
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#define AN30259A_REG_LEDCC(x) (0x03 + ((x) - 1))
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/* slope control registers */
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#define AN30259A_REG_SLOPE(x) (0x06 + ((x) - 1))
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#define AN30259A_LED_SLOPETIME1(x) (x)
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#define AN30259A_LED_SLOPETIME2(x) ((x) << 4)
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#define AN30259A_REG_LEDCNT1(x) (0x09 + (4 * ((x) - 1)))
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#define AN30259A_LED_DUTYMAX(x) ((x) << 4)
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#define AN30259A_LED_DUTYMID(x) (x)
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#define AN30259A_REG_LEDCNT2(x) (0x0A + (4 * ((x) - 1)))
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#define AN30259A_LED_DELAY(x) ((x) << 4)
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#define AN30259A_LED_DUTYMIN(x) (x)
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/* detention time control (length of each slope step) */
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#define AN30259A_REG_LEDCNT3(x) (0x0B + (4 * ((x) - 1)))
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#define AN30259A_LED_DT1(x) (x)
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#define AN30259A_LED_DT2(x) ((x) << 4)
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#define AN30259A_REG_LEDCNT4(x) (0x0C + (4 * ((x) - 1)))
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#define AN30259A_LED_DT3(x) (x)
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#define AN30259A_LED_DT4(x) ((x) << 4)
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#define AN30259A_REG_MAX 0x14
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#define AN30259A_BLINK_MAX_TIME 7500 /* ms */
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#define AN30259A_SLOPE_RESOLUTION 500 /* ms */
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#define STATE_OFF 0
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#define STATE_KEEP 1
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#define STATE_ON 2
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struct an30259a;
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struct an30259a_led {
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struct an30259a *chip;
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struct led_classdev cdev;
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u32 num;
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u32 default_state;
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bool sloping;
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char label[LED_MAX_NAME_SIZE];
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};
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struct an30259a {
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struct mutex mutex; /* held when writing to registers */
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struct i2c_client *client;
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struct an30259a_led leds[AN30259A_MAX_LEDS];
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struct regmap *regmap;
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int num_leds;
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};
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static int an30259a_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct an30259a_led *led;
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int ret;
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unsigned int led_on;
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led = container_of(cdev, struct an30259a_led, cdev);
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mutex_lock(&led->chip->mutex);
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ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);
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if (ret)
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goto error;
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switch (brightness) {
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case LED_OFF:
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led_on &= ~AN30259A_LED_EN(led->num);
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led_on &= ~AN30259A_LED_SLOPE(led->num);
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led->sloping = false;
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break;
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default:
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led_on |= AN30259A_LED_EN(led->num);
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if (led->sloping)
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led_on |= AN30259A_LED_SLOPE(led->num);
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ret = regmap_write(led->chip->regmap,
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AN30259A_REG_LEDCNT1(led->num),
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AN30259A_LED_DUTYMAX(0xf) |
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AN30259A_LED_DUTYMID(0xf));
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if (ret)
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goto error;
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break;
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}
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);
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if (ret)
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goto error;
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCC(led->num),
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brightness);
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error:
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mutex_unlock(&led->chip->mutex);
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return ret;
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}
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static int an30259a_blink_set(struct led_classdev *cdev,
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unsigned long *delay_off, unsigned long *delay_on)
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{
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struct an30259a_led *led;
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int ret, num;
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unsigned int led_on;
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unsigned long off = *delay_off, on = *delay_on;
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led = container_of(cdev, struct an30259a_led, cdev);
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mutex_lock(&led->chip->mutex);
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num = led->num;
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/* slope time can only be a multiple of 500ms. */
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if (off % AN30259A_SLOPE_RESOLUTION || on % AN30259A_SLOPE_RESOLUTION) {
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ret = -EINVAL;
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goto error;
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}
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/* up to a maximum of 7500ms. */
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if (off > AN30259A_BLINK_MAX_TIME || on > AN30259A_BLINK_MAX_TIME) {
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ret = -EINVAL;
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goto error;
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}
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/* if no blink specified, default to 1 Hz. */
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if (!off && !on) {
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*delay_off = off = 500;
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*delay_on = on = 500;
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}
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/* convert into values the HW will understand. */
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off /= AN30259A_SLOPE_RESOLUTION;
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on /= AN30259A_SLOPE_RESOLUTION;
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/* duty min should be zero (=off), delay should be zero. */
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT2(num),
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AN30259A_LED_DELAY(0) | AN30259A_LED_DUTYMIN(0));
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if (ret)
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goto error;
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/* reset detention time (no "breathing" effect). */
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT3(num),
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AN30259A_LED_DT1(0) | AN30259A_LED_DT2(0));
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if (ret)
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goto error;
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT4(num),
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AN30259A_LED_DT3(0) | AN30259A_LED_DT4(0));
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if (ret)
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goto error;
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/* slope time controls on/off cycle length. */
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ret = regmap_write(led->chip->regmap, AN30259A_REG_SLOPE(num),
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AN30259A_LED_SLOPETIME1(off) |
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AN30259A_LED_SLOPETIME2(on));
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if (ret)
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goto error;
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/* Finally, enable slope mode. */
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ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);
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if (ret)
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goto error;
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led_on |= AN30259A_LED_SLOPE(num) | AN30259A_LED_EN(led->num);
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ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);
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if (!ret)
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led->sloping = true;
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error:
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mutex_unlock(&led->chip->mutex);
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return ret;
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}
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static int an30259a_dt_init(struct i2c_client *client,
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struct an30259a *chip)
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{
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struct device_node *np = client->dev.of_node, *child;
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int count, ret;
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int i = 0;
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const char *str;
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struct an30259a_led *led;
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count = of_get_child_count(np);
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if (!count || count > AN30259A_MAX_LEDS)
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return -EINVAL;
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for_each_available_child_of_node(np, child) {
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u32 source;
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ret = of_property_read_u32(child, "reg", &source);
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if (ret != 0 || !source || source > AN30259A_MAX_LEDS) {
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dev_err(&client->dev, "Couldn't read LED address: %d\n",
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ret);
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count--;
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continue;
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}
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led = &chip->leds[i];
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led->num = source;
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led->chip = chip;
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if (of_property_read_string(child, "label", &str))
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snprintf(led->label, sizeof(led->label), "an30259a::");
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else
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snprintf(led->label, sizeof(led->label), "an30259a:%s",
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str);
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led->cdev.name = led->label;
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if (!of_property_read_string(child, "default-state", &str)) {
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if (!strcmp(str, "on"))
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led->default_state = STATE_ON;
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else if (!strcmp(str, "keep"))
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led->default_state = STATE_KEEP;
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else
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led->default_state = STATE_OFF;
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}
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of_property_read_string(child, "linux,default-trigger",
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&led->cdev.default_trigger);
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i++;
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}
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if (!count)
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return -EINVAL;
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chip->num_leds = i;
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return 0;
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}
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static const struct regmap_config an30259a_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = AN30259A_REG_MAX,
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};
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static void an30259a_init_default_state(struct an30259a_led *led)
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{
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struct an30259a *chip = led->chip;
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int led_on, err;
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switch (led->default_state) {
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case STATE_ON:
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led->cdev.brightness = LED_FULL;
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break;
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case STATE_KEEP:
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err = regmap_read(chip->regmap, AN30259A_REG_LED_ON, &led_on);
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if (err)
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break;
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if (!(led_on & AN30259A_LED_EN(led->num))) {
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led->cdev.brightness = LED_OFF;
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break;
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}
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regmap_read(chip->regmap, AN30259A_REG_LEDCC(led->num),
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&led->cdev.brightness);
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break;
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default:
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led->cdev.brightness = LED_OFF;
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}
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an30259a_brightness_set(&led->cdev, led->cdev.brightness);
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}
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static int an30259a_probe(struct i2c_client *client)
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{
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struct an30259a *chip;
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int i, err;
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chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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err = an30259a_dt_init(client, chip);
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if (err < 0)
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return err;
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mutex_init(&chip->mutex);
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chip->client = client;
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i2c_set_clientdata(client, chip);
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chip->regmap = devm_regmap_init_i2c(client, &an30259a_regmap_config);
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for (i = 0; i < chip->num_leds; i++) {
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an30259a_init_default_state(&chip->leds[i]);
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chip->leds[i].cdev.brightness_set_blocking =
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an30259a_brightness_set;
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chip->leds[i].cdev.blink_set = an30259a_blink_set;
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err = devm_led_classdev_register(&client->dev,
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&chip->leds[i].cdev);
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if (err < 0)
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goto exit;
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}
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return 0;
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exit:
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mutex_destroy(&chip->mutex);
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return err;
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}
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static int an30259a_remove(struct i2c_client *client)
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{
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struct an30259a *chip = i2c_get_clientdata(client);
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mutex_destroy(&chip->mutex);
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return 0;
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}
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static const struct of_device_id an30259a_match_table[] = {
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{ .compatible = "panasonic,an30259a", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, an30259a_match_table);
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static const struct i2c_device_id an30259a_id[] = {
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{ "an30259a", 0 },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(i2c, an30259a_id);
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static struct i2c_driver an30259a_driver = {
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.driver = {
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.name = "leds-an32059a",
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.of_match_table = of_match_ptr(an30259a_match_table),
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},
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.probe_new = an30259a_probe,
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.remove = an30259a_remove,
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.id_table = an30259a_id,
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};
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module_i2c_driver(an30259a_driver);
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MODULE_AUTHOR("Simon Shields <simon@lineageos.org>");
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MODULE_DESCRIPTION("AN32059A LED driver");
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MODULE_LICENSE("GPL v2");
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