1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved. 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 { 90 struct pm8058_led *led; 91 struct device_node *np = pdev->dev.of_node; 92 int ret; 93 struct regmap *map; 94 const char *state; 95 enum led_brightness maxbright; 96 97 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); 98 if (!led) 99 return -ENOMEM; 100 101 led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev); 102 103 map = dev_get_regmap(pdev->dev.parent, NULL); 104 if (!map) { 105 dev_err(&pdev->dev, "Parent regmap unavailable.\n"); 106 return -ENXIO; 107 } 108 led->map = map; 109 110 ret = of_property_read_u32(np, "reg", &led->reg); 111 if (ret) { 112 dev_err(&pdev->dev, "no register offset specified\n"); 113 return -EINVAL; 114 } 115 116 /* Use label else node name */ 117 led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; 118 led->cdev.default_trigger = 119 of_get_property(np, "linux,default-trigger", NULL); 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; 144 145 ret = devm_led_classdev_register(&pdev->dev, &led->cdev); 146 if (ret) { 147 dev_err(&pdev->dev, "unable to register led \"%s\"\n", 148 led->cdev.name); 149 return ret; 150 } 151 152 return 0; 153 } 154 155 static const struct of_device_id pm8058_leds_id_table[] = { 156 { 157 .compatible = "qcom,pm8058-led", 158 .data = (void *)PM8058_LED_TYPE_COMMON 159 }, 160 { 161 .compatible = "qcom,pm8058-keypad-led", 162 .data = (void *)PM8058_LED_TYPE_KEYPAD 163 }, 164 { 165 .compatible = "qcom,pm8058-flash-led", 166 .data = (void *)PM8058_LED_TYPE_FLASH 167 }, 168 { }, 169 }; 170 MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); 171 172 static struct platform_driver pm8058_led_driver = { 173 .probe = pm8058_led_probe, 174 .driver = { 175 .name = "pm8058-leds", 176 .of_match_table = pm8058_leds_id_table, 177 }, 178 }; 179 module_platform_driver(pm8058_led_driver); 180 181 MODULE_DESCRIPTION("PM8058 LEDs driver"); 182 MODULE_LICENSE("GPL v2"); 183 MODULE_ALIAS("platform:pm8058-leds"); 184