Thomas Gleixner | 97fb5e8 | 2019-05-29 07:17:58 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 2 | /* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved. |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 3 | */ |
| 4 | #include <linux/leds.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/of.h> |
| 7 | #include <linux/of_device.h> |
| 8 | #include <linux/platform_device.h> |
| 9 | #include <linux/pm.h> |
| 10 | #include <linux/regmap.h> |
| 11 | |
| 12 | #define PM8058_LED_TYPE_COMMON 0x00 |
| 13 | #define PM8058_LED_TYPE_KEYPAD 0x01 |
| 14 | #define PM8058_LED_TYPE_FLASH 0x02 |
| 15 | |
| 16 | #define PM8058_LED_TYPE_COMMON_MASK 0xf8 |
| 17 | #define PM8058_LED_TYPE_KEYPAD_MASK 0xf0 |
| 18 | #define PM8058_LED_TYPE_COMMON_SHIFT 3 |
| 19 | #define PM8058_LED_TYPE_KEYPAD_SHIFT 4 |
| 20 | |
| 21 | struct pm8058_led { |
| 22 | struct regmap *map; |
| 23 | u32 reg; |
| 24 | u32 ledtype; |
| 25 | struct led_classdev cdev; |
| 26 | }; |
| 27 | |
| 28 | static void pm8058_led_set(struct led_classdev *cled, |
| 29 | enum led_brightness value) |
| 30 | { |
| 31 | struct pm8058_led *led; |
| 32 | int ret = 0; |
| 33 | unsigned int mask = 0; |
| 34 | unsigned int val = 0; |
| 35 | |
| 36 | led = container_of(cled, struct pm8058_led, cdev); |
| 37 | switch (led->ledtype) { |
| 38 | case PM8058_LED_TYPE_COMMON: |
| 39 | mask = PM8058_LED_TYPE_COMMON_MASK; |
| 40 | val = value << PM8058_LED_TYPE_COMMON_SHIFT; |
| 41 | break; |
| 42 | case PM8058_LED_TYPE_KEYPAD: |
| 43 | case PM8058_LED_TYPE_FLASH: |
| 44 | mask = PM8058_LED_TYPE_KEYPAD_MASK; |
| 45 | val = value << PM8058_LED_TYPE_KEYPAD_SHIFT; |
| 46 | break; |
| 47 | default: |
| 48 | break; |
| 49 | } |
| 50 | |
| 51 | ret = regmap_update_bits(led->map, led->reg, mask, val); |
| 52 | if (ret) |
| 53 | pr_err("Failed to set LED brightness\n"); |
| 54 | } |
| 55 | |
| 56 | static enum led_brightness pm8058_led_get(struct led_classdev *cled) |
| 57 | { |
| 58 | struct pm8058_led *led; |
| 59 | int ret; |
| 60 | unsigned int val; |
| 61 | |
| 62 | led = container_of(cled, struct pm8058_led, cdev); |
| 63 | |
| 64 | ret = regmap_read(led->map, led->reg, &val); |
| 65 | if (ret) { |
| 66 | pr_err("Failed to get LED brightness\n"); |
| 67 | return LED_OFF; |
| 68 | } |
| 69 | |
| 70 | switch (led->ledtype) { |
| 71 | case PM8058_LED_TYPE_COMMON: |
| 72 | val &= PM8058_LED_TYPE_COMMON_MASK; |
| 73 | val >>= PM8058_LED_TYPE_COMMON_SHIFT; |
| 74 | break; |
| 75 | case PM8058_LED_TYPE_KEYPAD: |
| 76 | case PM8058_LED_TYPE_FLASH: |
| 77 | val &= PM8058_LED_TYPE_KEYPAD_MASK; |
| 78 | val >>= PM8058_LED_TYPE_KEYPAD_SHIFT; |
| 79 | break; |
| 80 | default: |
| 81 | val = LED_OFF; |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | return val; |
| 86 | } |
| 87 | |
| 88 | static int pm8058_led_probe(struct platform_device *pdev) |
| 89 | { |
Marek Behún | eed951b | 2020-09-18 00:33:08 +0200 | [diff] [blame] | 90 | struct led_init_data init_data = {}; |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 91 | struct device *dev = &pdev->dev; |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 92 | struct pm8058_led *led; |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 93 | struct device_node *np; |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 94 | int ret; |
| 95 | struct regmap *map; |
| 96 | const char *state; |
| 97 | enum led_brightness maxbright; |
| 98 | |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 99 | led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 100 | if (!led) |
| 101 | return -ENOMEM; |
| 102 | |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 103 | led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 104 | |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 105 | map = dev_get_regmap(dev->parent, NULL); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 106 | if (!map) { |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 107 | dev_err(dev, "Parent regmap unavailable.\n"); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 108 | return -ENXIO; |
| 109 | } |
| 110 | led->map = map; |
| 111 | |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 112 | np = dev_of_node(dev); |
| 113 | |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 114 | ret = of_property_read_u32(np, "reg", &led->reg); |
| 115 | if (ret) { |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 116 | dev_err(dev, "no register offset specified\n"); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 117 | return -EINVAL; |
| 118 | } |
| 119 | |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 120 | led->cdev.brightness_set = pm8058_led_set; |
| 121 | led->cdev.brightness_get = pm8058_led_get; |
| 122 | if (led->ledtype == PM8058_LED_TYPE_COMMON) |
| 123 | maxbright = 31; /* 5 bits */ |
| 124 | else |
| 125 | maxbright = 15; /* 4 bits */ |
| 126 | led->cdev.max_brightness = maxbright; |
| 127 | |
| 128 | state = of_get_property(np, "default-state", NULL); |
| 129 | if (state) { |
| 130 | if (!strcmp(state, "keep")) { |
| 131 | led->cdev.brightness = pm8058_led_get(&led->cdev); |
| 132 | } else if (!strcmp(state, "on")) { |
| 133 | led->cdev.brightness = maxbright; |
| 134 | pm8058_led_set(&led->cdev, maxbright); |
| 135 | } else { |
| 136 | led->cdev.brightness = LED_OFF; |
| 137 | pm8058_led_set(&led->cdev, LED_OFF); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | if (led->ledtype == PM8058_LED_TYPE_KEYPAD || |
| 142 | led->ledtype == PM8058_LED_TYPE_FLASH) |
| 143 | led->cdev.flags = LED_CORE_SUSPENDRESUME; |
| 144 | |
Marek Behún | eed951b | 2020-09-18 00:33:08 +0200 | [diff] [blame] | 145 | init_data.fwnode = of_fwnode_handle(np); |
| 146 | |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 147 | ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); |
Marek Behún | 1016daf9 | 2020-09-18 00:33:10 +0200 | [diff] [blame] | 148 | if (ret) |
Marek Behún | fb270ba | 2020-09-18 00:33:09 +0200 | [diff] [blame] | 149 | dev_err(dev, "Failed to register LED for %pOF\n", np); |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 150 | |
Marek Behún | 1016daf9 | 2020-09-18 00:33:10 +0200 | [diff] [blame] | 151 | return ret; |
Linus Walleij | 7f86698 | 2016-08-16 11:25:10 +0200 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static const struct of_device_id pm8058_leds_id_table[] = { |
| 155 | { |
| 156 | .compatible = "qcom,pm8058-led", |
| 157 | .data = (void *)PM8058_LED_TYPE_COMMON |
| 158 | }, |
| 159 | { |
| 160 | .compatible = "qcom,pm8058-keypad-led", |
| 161 | .data = (void *)PM8058_LED_TYPE_KEYPAD |
| 162 | }, |
| 163 | { |
| 164 | .compatible = "qcom,pm8058-flash-led", |
| 165 | .data = (void *)PM8058_LED_TYPE_FLASH |
| 166 | }, |
| 167 | { }, |
| 168 | }; |
| 169 | MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); |
| 170 | |
| 171 | static struct platform_driver pm8058_led_driver = { |
| 172 | .probe = pm8058_led_probe, |
| 173 | .driver = { |
| 174 | .name = "pm8058-leds", |
| 175 | .of_match_table = pm8058_leds_id_table, |
| 176 | }, |
| 177 | }; |
| 178 | module_platform_driver(pm8058_led_driver); |
| 179 | |
| 180 | MODULE_DESCRIPTION("PM8058 LEDs driver"); |
| 181 | MODULE_LICENSE("GPL v2"); |
| 182 | MODULE_ALIAS("platform:pm8058-leds"); |