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 led_init_data init_data = {}; 91 struct pm8058_led *led; 92 struct device_node *np = dev_of_node(&pdev->dev); 93 int ret; 94 struct regmap *map; 95 const char *state; 96 enum led_brightness maxbright; 97 98 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); 99 if (!led) 100 return -ENOMEM; 101 102 led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev); 103 104 map = dev_get_regmap(pdev->dev.parent, NULL); 105 if (!map) { 106 dev_err(&pdev->dev, "Parent regmap unavailable.\n"); 107 return -ENXIO; 108 } 109 led->map = map; 110 111 ret = of_property_read_u32(np, "reg", &led->reg); 112 if (ret) { 113 dev_err(&pdev->dev, "no register offset specified\n"); 114 return -EINVAL; 115 } 116 117 led->cdev.default_trigger = 118 of_get_property(np, "linux,default-trigger", NULL); 119 led->cdev.brightness_set = pm8058_led_set; 120 led->cdev.brightness_get = pm8058_led_get; 121 if (led->ledtype == PM8058_LED_TYPE_COMMON) 122 maxbright = 31; /* 5 bits */ 123 else 124 maxbright = 15; /* 4 bits */ 125 led->cdev.max_brightness = maxbright; 126 127 state = of_get_property(np, "default-state", NULL); 128 if (state) { 129 if (!strcmp(state, "keep")) { 130 led->cdev.brightness = pm8058_led_get(&led->cdev); 131 } else if (!strcmp(state, "on")) { 132 led->cdev.brightness = maxbright; 133 pm8058_led_set(&led->cdev, maxbright); 134 } else { 135 led->cdev.brightness = LED_OFF; 136 pm8058_led_set(&led->cdev, LED_OFF); 137 } 138 } 139 140 if (led->ledtype == PM8058_LED_TYPE_KEYPAD || 141 led->ledtype == PM8058_LED_TYPE_FLASH) 142 led->cdev.flags = LED_CORE_SUSPENDRESUME; 143 144 init_data.fwnode = of_fwnode_handle(np); 145 146 ret = devm_led_classdev_register_ext(&pdev->dev, &led->cdev, 147 &init_data); 148 if (ret) { 149 dev_err(&pdev->dev, "Failed to register LED for %pOF\n", np); 150 return ret; 151 } 152 153 return 0; 154 } 155 156 static const struct of_device_id pm8058_leds_id_table[] = { 157 { 158 .compatible = "qcom,pm8058-led", 159 .data = (void *)PM8058_LED_TYPE_COMMON 160 }, 161 { 162 .compatible = "qcom,pm8058-keypad-led", 163 .data = (void *)PM8058_LED_TYPE_KEYPAD 164 }, 165 { 166 .compatible = "qcom,pm8058-flash-led", 167 .data = (void *)PM8058_LED_TYPE_FLASH 168 }, 169 { }, 170 }; 171 MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); 172 173 static struct platform_driver pm8058_led_driver = { 174 .probe = pm8058_led_probe, 175 .driver = { 176 .name = "pm8058-leds", 177 .of_match_table = pm8058_leds_id_table, 178 }, 179 }; 180 module_platform_driver(pm8058_led_driver); 181 182 MODULE_DESCRIPTION("PM8058 LEDs driver"); 183 MODULE_LICENSE("GPL v2"); 184 MODULE_ALIAS("platform:pm8058-leds"); 185