drivers/leds/leds-88pm860x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LED driver for Marvell 88PM860x
   4  *
   5  * Copyright (C) 2009 Marvell International Ltd.
   6  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/of.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/i2c.h>
  13 #include <linux/leds.h>
  14 #include <linux/slab.h>
  15 #include <linux/mfd/88pm860x.h>
  16 #include <linux/module.h>
  17
  18 #define LED_PWM_MASK            (0x1F)
  19 #define LED_CURRENT_MASK        (0x07 << 5)
  20
  21 #define LED_BLINK_MASK          (0x7F)
  22
  23 #define LED_ON_CONTINUOUS       (0x0F << 3)
  24
  25 #define LED1_BLINK_EN           (1 << 1)
  26 #define LED2_BLINK_EN           (1 << 2)
  27
  28 struct pm860x_led {
  29         struct led_classdev cdev;
  30         struct i2c_client *i2c;
  31         struct pm860x_chip *chip;
  32         struct mutex lock;
  33         char name[MFD_NAME_SIZE];
  34
  35         int port;
  36         int iset;
  37         unsigned char brightness;
  38         unsigned char current_brightness;
  39
  40         int reg_control;
  41         int reg_blink;
  42         int blink_mask;
  43 };
  44
  45 static int led_power_set(struct pm860x_chip *chip, int port, int on)
  46 {
  47         int ret = -EINVAL;
  48
  49         switch (port) {
  50         case 0:
  51         case 1:
  52         case 2:
  53                 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
  54                         pm8606_osc_disable(chip, RGB1_ENABLE);
  55                 break;
  56         case 3:
  57         case 4:
  58         case 5:
  59                 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
  60                         pm8606_osc_disable(chip, RGB2_ENABLE);
  61                 break;
  62         }
  63         return ret;
  64 }
  65
  66 static int pm860x_led_set(struct led_classdev *cdev,
  67                            enum led_brightness value)
  68 {
  69         struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev);
  70         struct pm860x_chip *chip;
  71         unsigned char buf[3];
  72         int ret;
  73
  74         chip = led->chip;
  75         mutex_lock(&led->lock);
  76         led->brightness = value >> 3;
  77
  78         if ((led->current_brightness == 0) && led->brightness) {
  79                 led_power_set(chip, led->port, 1);
  80                 if (led->iset) {
  81                         pm860x_set_bits(led->i2c, led->reg_control,
  82                                         LED_CURRENT_MASK, led->iset);
  83                 }
  84                 pm860x_set_bits(led->i2c, led->reg_blink,
  85                                 LED_BLINK_MASK, LED_ON_CONTINUOUS);
  86                 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
  87                                 led->blink_mask);
  88         }
  89         pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
  90                         led->brightness);
  91
  92         if (led->brightness == 0) {
  93                 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
  94                 ret = buf[0] & LED_PWM_MASK;
  95                 ret |= buf[1] & LED_PWM_MASK;
  96                 ret |= buf[2] & LED_PWM_MASK;
  97                 if (ret == 0) {
  98                         /* unset current since no led is lighting */
  99                         pm860x_set_bits(led->i2c, led->reg_control,
 100                                         LED_CURRENT_MASK, 0);
 101                         pm860x_set_bits(led->i2c, PM8606_WLED3B,
 102                                         led->blink_mask, 0);
 103                         led_power_set(chip, led->port, 0);
 104                 }
 105         }
 106         led->current_brightness = led->brightness;
 107         dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 108                 led->reg_control, led->brightness);
 109         mutex_unlock(&led->lock);
 110
 111         return 0;
 112 }
 113
 114 #ifdef CONFIG_OF
 115 static int pm860x_led_dt_init(struct platform_device *pdev,
 116                               struct pm860x_led *data)
 117 {
 118         struct device_node *nproot, *np;
 119         int iset = 0;
 120
 121         if (!pdev->dev.parent->of_node)
 122                 return -ENODEV;
 123         nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
 124         if (!nproot) {
 125                 dev_err(&pdev->dev, "failed to find leds node\n");
 126                 return -ENODEV;
 127         }
 128         for_each_child_of_node(nproot, np) {
 129                 if (of_node_name_eq(np, data->name)) {
 130                         of_property_read_u32(np, "marvell,88pm860x-iset",
 131                                              &iset);
 132                         data->iset = PM8606_LED_CURRENT(iset);
 133                         of_node_put(np);
 134                         break;
 135                 }
 136         }
 137         of_node_put(nproot);
 138         return 0;
 139 }
 140 #else
 141 #define pm860x_led_dt_init(x, y)        (-1)
 142 #endif
 143
 144 static int pm860x_led_probe(struct platform_device *pdev)
 145 {
 146         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 147         struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
 148         struct pm860x_led *data;
 149         struct resource *res;
 150         int ret = 0;
 151
 152         data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
 153         if (data == NULL)
 154                 return -ENOMEM;
 155         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
 156         if (!res) {
 157                 dev_err(&pdev->dev, "No REG resource for control\n");
 158                 return -ENXIO;
 159         }
 160         data->reg_control = res->start;
 161         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
 162         if (!res) {
 163                 dev_err(&pdev->dev, "No REG resource for blink\n");
 164                 return -ENXIO;
 165         }
 166         data->reg_blink = res->start;
 167         memset(data->name, 0, MFD_NAME_SIZE);
 168         switch (pdev->id) {
 169         case 0:
 170                 data->blink_mask = LED1_BLINK_EN;
 171                 sprintf(data->name, "led0-red");
 172                 break;
 173         case 1:
 174                 data->blink_mask = LED1_BLINK_EN;
 175                 sprintf(data->name, "led0-green");
 176                 break;
 177         case 2:
 178                 data->blink_mask = LED1_BLINK_EN;
 179                 sprintf(data->name, "led0-blue");
 180                 break;
 181         case 3:
 182                 data->blink_mask = LED2_BLINK_EN;
 183                 sprintf(data->name, "led1-red");
 184                 break;
 185         case 4:
 186                 data->blink_mask = LED2_BLINK_EN;
 187                 sprintf(data->name, "led1-green");
 188                 break;
 189         case 5:
 190                 data->blink_mask = LED2_BLINK_EN;
 191                 sprintf(data->name, "led1-blue");
 192                 break;
 193         }
 194         data->chip = chip;
 195         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 196         data->port = pdev->id;
 197         if (pm860x_led_dt_init(pdev, data))
 198                 if (pdata)
 199                         data->iset = pdata->iset;
 200
 201         data->current_brightness = 0;
 202         data->cdev.name = data->name;
 203         data->cdev.brightness_set_blocking = pm860x_led_set;
 204         mutex_init(&data->lock);
 205
 206         ret = devm_led_classdev_register(chip->dev, &data->cdev);
 207         if (ret < 0) {
 208                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 209                 return ret;
 210         }
 211         pm860x_led_set(&data->cdev, 0);
 212         return 0;
 213 }
 214
 215
 216 static struct platform_driver pm860x_led_driver = {
 217         .driver = {
 218                 .name   = "88pm860x-led",
 219         },
 220         .probe  = pm860x_led_probe,
 221 };
 222
 223 module_platform_driver(pm860x_led_driver);
 224
 225 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 226 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 227 MODULE_LICENSE("GPL");
 228 MODULE_ALIAS("platform:88pm860x-led");