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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 2017 Sebastian Reichel <sre@kernel.org> */ #include <linux/leds.h> #include <linux/mfd/motorola-cpcap.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #define CPCAP_LED_NO_CURRENT 0x0001 struct cpcap_led_info { u16 reg; u16 mask; u16 limit; u16 init_mask; u16 init_val; }; static const struct cpcap_led_info cpcap_led_red = { .reg = CPCAP_REG_REDC, .mask = 0x03FF, .limit = 31, }; static const struct cpcap_led_info cpcap_led_green = { .reg = CPCAP_REG_GREENC, .mask = 0x03FF, .limit = 31, }; static const struct cpcap_led_info cpcap_led_blue = { .reg = CPCAP_REG_BLUEC, .mask = 0x03FF, .limit = 31, }; /* aux display light */ static const struct cpcap_led_info cpcap_led_adl = { .reg = CPCAP_REG_ADLC, .mask = 0x000F, .limit = 1, .init_mask = 0x7FFF, .init_val = 0x5FF0, }; /* camera privacy led */ static const struct cpcap_led_info cpcap_led_cp = { .reg = CPCAP_REG_CLEDC, .mask = 0x0007, .limit = 1, .init_mask = 0x03FF, .init_val = 0x0008, }; struct cpcap_led { struct led_classdev led; const struct cpcap_led_info *info; struct device *dev; struct regmap *regmap; struct mutex update_lock; struct regulator *vdd; bool powered; u32 current_limit; }; static u16 cpcap_led_val(u8 current_limit, u8 duty_cycle) { current_limit &= 0x1f; /* 5 bit */ duty_cycle &= 0x0f; /* 4 bit */ return current_limit << 4 | duty_cycle; } static int cpcap_led_set_power(struct cpcap_led *led, bool status) { int err; if (status == led->powered) return 0; if (status) err = regulator_enable(led->vdd); else err = regulator_disable(led->vdd); if (err) { dev_err(led->dev, "regulator failure: %d", err); return err; } led->powered = status; return 0; } static int cpcap_led_set(struct led_classdev *ledc, enum led_brightness value) { struct cpcap_led *led = container_of(ledc, struct cpcap_led, led); int brightness; int err; mutex_lock(&led->update_lock); if (value > LED_OFF) { err = cpcap_led_set_power(led, true); if (err) goto exit; } if (value == LED_OFF) { /* Avoid HW issue by turning off current before duty cycle */ err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask, CPCAP_LED_NO_CURRENT); if (err) { dev_err(led->dev, "regmap failed: %d", err); goto exit; } brightness = cpcap_led_val(value, LED_OFF); } else { brightness = cpcap_led_val(value, LED_ON); } err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask, brightness); if (err) { dev_err(led->dev, "regmap failed: %d", err); goto exit; } if (value == LED_OFF) { err = cpcap_led_set_power(led, false); if (err) goto exit; } exit: mutex_unlock(&led->update_lock); return err; } static const struct of_device_id cpcap_led_of_match[] = { { .compatible = "motorola,cpcap-led-red", .data = &cpcap_led_red }, { .compatible = "motorola,cpcap-led-green", .data = &cpcap_led_green }, { .compatible = "motorola,cpcap-led-blue", .data = &cpcap_led_blue }, { .compatible = "motorola,cpcap-led-adl", .data = &cpcap_led_adl }, { .compatible = "motorola,cpcap-led-cp", .data = &cpcap_led_cp }, {}, }; MODULE_DEVICE_TABLE(of, cpcap_led_of_match); static int cpcap_led_probe(struct platform_device *pdev) { struct cpcap_led *led; int err; led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; platform_set_drvdata(pdev, led); led->info = device_get_match_data(&pdev->dev); led->dev = &pdev->dev; if (led->info->reg == 0x0000) { dev_err(led->dev, "Unsupported LED"); return -ENODEV; } led->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!led->regmap) return -ENODEV; led->vdd = devm_regulator_get(&pdev->dev, "vdd"); if (IS_ERR(led->vdd)) { err = PTR_ERR(led->vdd); dev_err(led->dev, "Couldn't get regulator: %d", err); return err; } err = device_property_read_string(&pdev->dev, "label", &led->led.name); if (err) { dev_err(led->dev, "Couldn't read LED label: %d", err); return err; } if (led->info->init_mask) { err = regmap_update_bits(led->regmap, led->info->reg, led->info->init_mask, led->info->init_val); if (err) { dev_err(led->dev, "regmap failed: %d", err); return err; } } mutex_init(&led->update_lock); led->led.max_brightness = led->info->limit; led->led.brightness_set_blocking = cpcap_led_set; err = devm_led_classdev_register(&pdev->dev, &led->led); if (err) { dev_err(led->dev, "Couldn't register LED: %d", err); return err; } return 0; } static struct platform_driver cpcap_led_driver = { .probe = cpcap_led_probe, .driver = { .name = "cpcap-led", .of_match_table = cpcap_led_of_match, }, }; module_platform_driver(cpcap_led_driver); MODULE_DESCRIPTION("CPCAP LED driver"); MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); MODULE_LICENSE("GPL"); |