drivers/leds/leds-da9052.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * LED Driver for Dialog DA9052 PMICs.
   4  *
   5  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   6  *
   7  * Author: David Dajun Chen <dchen@diasemi.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/leds.h>
  14 #include <linux/slab.h>
  15
  16 #include <linux/mfd/da9052/reg.h>
  17 #include <linux/mfd/da9052/da9052.h>
  18 #include <linux/mfd/da9052/pdata.h>
  19
  20 #define DA9052_OPENDRAIN_OUTPUT 2
  21 #define DA9052_SET_HIGH_LVL_OUTPUT      (1 << 3)
  22 #define DA9052_MASK_UPPER_NIBBLE        0xF0
  23 #define DA9052_MASK_LOWER_NIBBLE        0x0F
  24 #define DA9052_NIBBLE_SHIFT             4
  25 #define DA9052_MAX_BRIGHTNESS           0x5f
  26
  27 struct da9052_led {
  28         struct led_classdev cdev;
  29         struct da9052 *da9052;
  30         unsigned char led_index;
  31         unsigned char id;
  32 };
  33
  34 static unsigned char led_reg[] = {
  35         DA9052_LED_CONT_4_REG,
  36         DA9052_LED_CONT_5_REG,
  37 };
  38
  39 static int da9052_set_led_brightness(struct da9052_led *led,
  40                                      enum led_brightness brightness)
  41 {
  42         u8 val;
  43         int error;
  44
  45         val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
  46
  47         error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
  48         if (error < 0)
  49                 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
  50                         error);
  51         return error;
  52 }
  53
  54 static int da9052_led_set(struct led_classdev *led_cdev,
  55                            enum led_brightness value)
  56 {
  57         struct da9052_led *led =
  58                         container_of(led_cdev, struct da9052_led, cdev);
  59
  60         return da9052_set_led_brightness(led, value);
  61 }
  62
  63 static int da9052_configure_leds(struct da9052 *da9052)
  64 {
  65         int error;
  66         unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
  67                                        | DA9052_SET_HIGH_LVL_OUTPUT;
  68
  69         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
  70                                   DA9052_MASK_LOWER_NIBBLE,
  71                                   register_value);
  72
  73         if (error < 0) {
  74                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
  75                         error);
  76                 return error;
  77         }
  78
  79         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
  80                                   DA9052_MASK_UPPER_NIBBLE,
  81                                   register_value << DA9052_NIBBLE_SHIFT);
  82         if (error < 0)
  83                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
  84                         error);
  85
  86         return error;
  87 }
  88
  89 static int da9052_led_probe(struct platform_device *pdev)
  90 {
  91         struct da9052_pdata *pdata;
  92         struct da9052 *da9052;
  93         struct led_platform_data *pled;
  94         struct da9052_led *led = NULL;
  95         int error = -ENODEV;
  96         int i;
  97
  98         da9052 = dev_get_drvdata(pdev->dev.parent);
  99         pdata = dev_get_platdata(da9052->dev);
 100         if (pdata == NULL) {
 101                 dev_err(&pdev->dev, "No platform data\n");
 102                 goto err;
 103         }
 104
 105         pled = pdata->pled;
 106         if (pled == NULL) {
 107                 dev_err(&pdev->dev, "No platform data for LED\n");
 108                 goto err;
 109         }
 110
 111         led = devm_kcalloc(&pdev->dev,
 112                            pled->num_leds, sizeof(struct da9052_led),
 113                            GFP_KERNEL);
 114         if (!led) {
 115                 error = -ENOMEM;
 116                 goto err;
 117         }
 118
 119         for (i = 0; i < pled->num_leds; i++) {
 120                 led[i].cdev.name = pled->leds[i].name;
 121                 led[i].cdev.brightness_set_blocking = da9052_led_set;
 122                 led[i].cdev.brightness = LED_OFF;
 123                 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
 124                 led[i].led_index = pled->leds[i].flags;
 125                 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
 126
 127                 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
 128                 if (error) {
 129                         dev_err(&pdev->dev, "Failed to register led %d\n",
 130                                 led[i].led_index);
 131                         goto err_register;
 132                 }
 133
 134                 error = da9052_set_led_brightness(&led[i],
 135                                                   led[i].cdev.brightness);
 136                 if (error) {
 137                         dev_err(&pdev->dev, "Unable to init led %d\n",
 138                                 led[i].led_index);
 139                         continue;
 140                 }
 141         }
 142         error = da9052_configure_leds(led->da9052);
 143         if (error) {
 144                 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
 145                 goto err_register;
 146         }
 147
 148         platform_set_drvdata(pdev, led);
 149
 150         return 0;
 151
 152 err_register:
 153         for (i = i - 1; i >= 0; i--)
 154                 led_classdev_unregister(&led[i].cdev);
 155 err:
 156         return error;
 157 }
 158
 159 static int da9052_led_remove(struct platform_device *pdev)
 160 {
 161         struct da9052_led *led = platform_get_drvdata(pdev);
 162         struct da9052_pdata *pdata;
 163         struct da9052 *da9052;
 164         struct led_platform_data *pled;
 165         int i;
 166
 167         da9052 = dev_get_drvdata(pdev->dev.parent);
 168         pdata = dev_get_platdata(da9052->dev);
 169         pled = pdata->pled;
 170
 171         for (i = 0; i < pled->num_leds; i++) {
 172                 da9052_set_led_brightness(&led[i], LED_OFF);
 173                 led_classdev_unregister(&led[i].cdev);
 174         }
 175
 176         return 0;
 177 }
 178
 179 static struct platform_driver da9052_led_driver = {
 180         .driver         = {
 181                 .name   = "da9052-leds",
 182         },
 183         .probe          = da9052_led_probe,
 184         .remove         = da9052_led_remove,
 185 };
 186
 187 module_platform_driver(da9052_led_driver);
 188
 189 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
 190 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
 191 MODULE_LICENSE("GPL");