drivers/leds/leds-pm8058.c

   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/platform_device.h>
   8 #include <linux/pm.h>
   9 #include <linux/regmap.h>
  10
  11 #define PM8058_LED_TYPE_COMMON  0x00
  12 #define PM8058_LED_TYPE_KEYPAD  0x01
  13 #define PM8058_LED_TYPE_FLASH   0x02
  14
  15 #define PM8058_LED_TYPE_COMMON_MASK     0xf8
  16 #define PM8058_LED_TYPE_KEYPAD_MASK     0xf0
  17 #define PM8058_LED_TYPE_COMMON_SHIFT    3
  18 #define PM8058_LED_TYPE_KEYPAD_SHIFT    4
  19
  20 struct pm8058_led {
  21         struct regmap *map;
  22         u32 reg;
  23         u32 ledtype;
  24         struct led_classdev cdev;
  25 };
  26
  27 static void pm8058_led_set(struct led_classdev *cled,
  28         enum led_brightness value)
  29 {
  30         struct pm8058_led *led;
  31         int ret = 0;
  32         unsigned int mask = 0;
  33         unsigned int val = 0;
  34
  35         led = container_of(cled, struct pm8058_led, cdev);
  36         switch (led->ledtype) {
  37         case PM8058_LED_TYPE_COMMON:
  38                 mask = PM8058_LED_TYPE_COMMON_MASK;
  39                 val = value << PM8058_LED_TYPE_COMMON_SHIFT;
  40                 break;
  41         case PM8058_LED_TYPE_KEYPAD:
  42         case PM8058_LED_TYPE_FLASH:
  43                 mask = PM8058_LED_TYPE_KEYPAD_MASK;
  44                 val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
  45                 break;
  46         default:
  47                 break;
  48         }
  49
  50         ret = regmap_update_bits(led->map, led->reg, mask, val);
  51         if (ret)
  52                 pr_err("Failed to set LED brightness\n");
  53 }
  54
  55 static enum led_brightness pm8058_led_get(struct led_classdev *cled)
  56 {
  57         struct pm8058_led *led;
  58         int ret;
  59         unsigned int val;
  60
  61         led = container_of(cled, struct pm8058_led, cdev);
  62
  63         ret = regmap_read(led->map, led->reg, &val);
  64         if (ret) {
  65                 pr_err("Failed to get LED brightness\n");
  66                 return LED_OFF;
  67         }
  68
  69         switch (led->ledtype) {
  70         case PM8058_LED_TYPE_COMMON:
  71                 val &= PM8058_LED_TYPE_COMMON_MASK;
  72                 val >>= PM8058_LED_TYPE_COMMON_SHIFT;
  73                 break;
  74         case PM8058_LED_TYPE_KEYPAD:
  75         case PM8058_LED_TYPE_FLASH:
  76                 val &= PM8058_LED_TYPE_KEYPAD_MASK;
  77                 val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
  78                 break;
  79         default:
  80                 val = LED_OFF;
  81                 break;
  82         }
  83
  84         return val;
  85 }
  86
  87 static int pm8058_led_probe(struct platform_device *pdev)
  88 {
  89         struct led_init_data init_data = {};
  90         struct device *dev = &pdev->dev;
  91         struct pm8058_led *led;
  92         struct device_node *np;
  93         int ret;
  94         struct regmap *map;
  95         enum led_brightness maxbright;
  96         enum led_default_state state;
  97
  98         led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
  99         if (!led)
 100                 return -ENOMEM;
 101
 102         led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev);
 103
 104         map = dev_get_regmap(dev->parent, NULL);
 105         if (!map) {
 106                 dev_err(dev, "Parent regmap unavailable.\n");
 107                 return -ENXIO;
 108         }
 109         led->map = map;
 110
 111         np = dev_of_node(dev);
 112
 113         ret = of_property_read_u32(np, "reg", &led->reg);
 114         if (ret) {
 115                 dev_err(dev, "no register offset specified\n");
 116                 return -EINVAL;
 117         }
 118
 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         init_data.fwnode = of_fwnode_handle(np);
 128
 129         state = led_init_default_state_get(init_data.fwnode);
 130         switch (state) {
 131         case LEDS_DEFSTATE_ON:
 132                 led->cdev.brightness = maxbright;
 133                 pm8058_led_set(&led->cdev, maxbright);
 134                 break;
 135         case LEDS_DEFSTATE_KEEP:
 136                 led->cdev.brightness = pm8058_led_get(&led->cdev);
 137                 break;
 138         default:
 139                 led->cdev.brightness = LED_OFF;
 140                 pm8058_led_set(&led->cdev, LED_OFF);
 141         }
 142
 143         if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
 144             led->ledtype == PM8058_LED_TYPE_FLASH)
 145                 led->cdev.flags = LED_CORE_SUSPENDRESUME;
 146
 147         ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
 148         if (ret)
 149                 dev_err(dev, "Failed to register LED for %pOF\n", np);
 150
 151         return ret;
 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");