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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | /* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/leds.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/regmap.h> #define PM8058_LED_TYPE_COMMON 0x00 #define PM8058_LED_TYPE_KEYPAD 0x01 #define PM8058_LED_TYPE_FLASH 0x02 #define PM8058_LED_TYPE_COMMON_MASK 0xf8 #define PM8058_LED_TYPE_KEYPAD_MASK 0xf0 #define PM8058_LED_TYPE_COMMON_SHIFT 3 #define PM8058_LED_TYPE_KEYPAD_SHIFT 4 struct pm8058_led { struct regmap *map; u32 reg; u32 ledtype; struct led_classdev cdev; }; static void pm8058_led_set(struct led_classdev *cled, enum led_brightness value) { struct pm8058_led *led; int ret = 0; unsigned int mask = 0; unsigned int val = 0; led = container_of(cled, struct pm8058_led, cdev); switch (led->ledtype) { case PM8058_LED_TYPE_COMMON: mask = PM8058_LED_TYPE_COMMON_MASK; val = value << PM8058_LED_TYPE_COMMON_SHIFT; break; case PM8058_LED_TYPE_KEYPAD: case PM8058_LED_TYPE_FLASH: mask = PM8058_LED_TYPE_KEYPAD_MASK; val = value << PM8058_LED_TYPE_KEYPAD_SHIFT; break; default: break; } ret = regmap_update_bits(led->map, led->reg, mask, val); if (ret) pr_err("Failed to set LED brightness\n"); } static enum led_brightness pm8058_led_get(struct led_classdev *cled) { struct pm8058_led *led; int ret; unsigned int val; led = container_of(cled, struct pm8058_led, cdev); ret = regmap_read(led->map, led->reg, &val); if (ret) { pr_err("Failed to get LED brightness\n"); return LED_OFF; } switch (led->ledtype) { case PM8058_LED_TYPE_COMMON: val &= PM8058_LED_TYPE_COMMON_MASK; val >>= PM8058_LED_TYPE_COMMON_SHIFT; break; case PM8058_LED_TYPE_KEYPAD: case PM8058_LED_TYPE_FLASH: val &= PM8058_LED_TYPE_KEYPAD_MASK; val >>= PM8058_LED_TYPE_KEYPAD_SHIFT; break; default: val = LED_OFF; break; } return val; } static int pm8058_led_probe(struct platform_device *pdev) { struct pm8058_led *led; struct device_node *np = pdev->dev.of_node; int ret; struct regmap *map; const char *state; enum led_brightness maxbright; led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev); map = dev_get_regmap(pdev->dev.parent, NULL); if (!map) { dev_err(&pdev->dev, "Parent regmap unavailable.\n"); return -ENXIO; } led->map = map; ret = of_property_read_u32(np, "reg", &led->reg); if (ret) { dev_err(&pdev->dev, "no register offset specified\n"); return -EINVAL; } /* Use label else node name */ led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; led->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL); led->cdev.brightness_set = pm8058_led_set; led->cdev.brightness_get = pm8058_led_get; if (led->ledtype == PM8058_LED_TYPE_COMMON) maxbright = 31; /* 5 bits */ else maxbright = 15; /* 4 bits */ led->cdev.max_brightness = maxbright; state = of_get_property(np, "default-state", NULL); if (state) { if (!strcmp(state, "keep")) { led->cdev.brightness = pm8058_led_get(&led->cdev); } else if (!strcmp(state, "on")) { led->cdev.brightness = maxbright; pm8058_led_set(&led->cdev, maxbright); } else { led->cdev.brightness = LED_OFF; pm8058_led_set(&led->cdev, LED_OFF); } } if (led->ledtype == PM8058_LED_TYPE_KEYPAD || led->ledtype == PM8058_LED_TYPE_FLASH) led->cdev.flags = LED_CORE_SUSPENDRESUME; ret = devm_led_classdev_register(&pdev->dev, &led->cdev); if (ret) { dev_err(&pdev->dev, "unable to register led \"%s\"\n", led->cdev.name); return ret; } return 0; } static const struct of_device_id pm8058_leds_id_table[] = { { .compatible = "qcom,pm8058-led", .data = (void *)PM8058_LED_TYPE_COMMON }, { .compatible = "qcom,pm8058-keypad-led", .data = (void *)PM8058_LED_TYPE_KEYPAD }, { .compatible = "qcom,pm8058-flash-led", .data = (void *)PM8058_LED_TYPE_FLASH }, { }, }; MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); static struct platform_driver pm8058_led_driver = { .probe = pm8058_led_probe, .driver = { .name = "pm8058-leds", .of_match_table = pm8058_leds_id_table, }, }; module_platform_driver(pm8058_led_driver); MODULE_DESCRIPTION("PM8058 LEDs driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:pm8058-leds"); |