^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * leds-regulator.c - LED class driver for regulator driven LEDs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Inspired by leds-wm8350 driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/leds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/leds-regulator.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define to_regulator_led(led_cdev) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) container_of(led_cdev, struct regulator_led, cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct regulator_led {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct led_classdev cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct regulator *vcc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline int led_regulator_get_max_brightness(struct regulator *supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int voltage = regulator_list_voltage(supply, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) if (voltage <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* even if regulator can't change voltages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * we still assume it can change status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * and the LED can be turned on and off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ret = regulator_set_voltage(supply, voltage, voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return regulator_count_voltages(supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int led_regulator_get_voltage(struct regulator *supply,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) enum led_brightness brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (brightness == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return regulator_list_voltage(supply, brightness - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static void regulator_led_enable(struct regulator_led *led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (led->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ret = regulator_enable(led->vcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) dev_err(led->cdev.dev, "Failed to enable vcc: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) led->enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static void regulator_led_disable(struct regulator_led *led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (!led->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ret = regulator_disable(led->vcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) dev_err(led->cdev.dev, "Failed to disable vcc: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) led->enabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int regulator_led_brightness_set(struct led_classdev *led_cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) enum led_brightness value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct regulator_led *led = to_regulator_led(led_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) int voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mutex_lock(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (value == LED_OFF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) regulator_led_disable(led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (led->cdev.max_brightness > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) voltage = led_regulator_get_voltage(led->vcc, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) dev_dbg(led->cdev.dev, "brightness: %d voltage: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) value, voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = regulator_set_voltage(led->vcc, voltage, voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) dev_err(led->cdev.dev, "Failed to set voltage %d: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) voltage, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) regulator_led_enable(led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) mutex_unlock(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static int regulator_led_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct led_regulator_platform_data *pdata =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct regulator_led *led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct regulator *vcc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (pdata == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) dev_err(&pdev->dev, "no platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) vcc = devm_regulator_get_exclusive(&pdev->dev, "vled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (IS_ERR(vcc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return PTR_ERR(vcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (led == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (pdata->brightness > led->cdev.max_brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) dev_err(&pdev->dev, "Invalid default brightness %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) pdata->brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) led->cdev.brightness_set_blocking = regulator_led_brightness_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) led->cdev.name = pdata->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) led->cdev.flags |= LED_CORE_SUSPENDRESUME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) led->vcc = vcc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* to handle correctly an already enabled regulator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (regulator_is_enabled(led->vcc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) led->enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mutex_init(&led->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) platform_set_drvdata(pdev, led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ret = led_classdev_register(&pdev->dev, &led->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* to expose the default value to userspace */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) led->cdev.brightness = pdata->brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Set the default led status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) regulator_led_brightness_set(&led->cdev, led->cdev.brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static int regulator_led_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct regulator_led *led = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) led_classdev_unregister(&led->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) regulator_led_disable(led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static struct platform_driver regulator_led_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .name = "leds-regulator",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .probe = regulator_led_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .remove = regulator_led_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) module_platform_driver(regulator_led_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) MODULE_DESCRIPTION("Regulator driven LED driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) MODULE_ALIAS("platform:leds-regulator");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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