drivers/leds/leds-88pm860x.c

   1 /*
   2  * LED driver for Marvell 88PM860x
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/i2c.h>
  17 #include <linux/leds.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/mfd/88pm860x.h>
  20
  21 #define LED_PWM_SHIFT           (3)
  22 #define LED_PWM_MASK            (0x1F)
  23 #define LED_CURRENT_MASK        (0x07 << 5)
  24
  25 #define LED_BLINK_ON_MASK       (0x07)
  26 #define LED_BLINK_PERIOD_MASK   (0x0F << 3)
  27 #define LED_BLINK_MASK          (0x7F)
  28
  29 #define LED_BLINK_ON(x)         ((x & 0x7) * 66 + 66)
  30 #define LED_BLINK_PERIOD(x)     ((x & 0xF) * 530 + 930)
  31 #define LED_BLINK_ON_MIN        LED_BLINK_ON(0)
  32 #define LED_BLINK_ON_MAX        LED_BLINK_ON(0x7)
  33 #define LED_BLINK_PERIOD_MIN    LED_BLINK_PERIOD(0)
  34 #define LED_BLINK_PERIOD_MAX    LED_BLINK_PERIOD(0xE)
  35 #define LED_TO_ON(x)            ((x - 66) / 66)
  36 #define LED_TO_PERIOD(x)        ((x - 930) / 530)
  37
  38 #define LED1_BLINK_EN           (1 << 1)
  39 #define LED2_BLINK_EN           (1 << 2)
  40
  41 enum {
  42         SET_BRIGHTNESS,
  43         SET_BLINK,
  44 };
  45
  46 struct pm860x_led {
  47         struct led_classdev cdev;
  48         struct i2c_client *i2c;
  49         struct work_struct work;
  50         struct pm860x_chip *chip;
  51         struct mutex lock;
  52         char name[MFD_NAME_SIZE];
  53
  54         int port;
  55         int iset;
  56         int command;
  57         int offset;
  58         unsigned char brightness;
  59         unsigned char current_brightness;
  60
  61         int blink_data;
  62         int blink_time;
  63         int blink_on;
  64         int blink_off;
  65 };
  66
  67 /* return offset of color register */
  68 static inline int __led_off(int port)
  69 {
  70         int ret = -EINVAL;
  71
  72         switch (port) {
  73         case PM8606_LED1_RED:
  74         case PM8606_LED1_GREEN:
  75         case PM8606_LED1_BLUE:
  76                 ret = port - PM8606_LED1_RED + PM8606_RGB1B;
  77                 break;
  78         case PM8606_LED2_RED:
  79         case PM8606_LED2_GREEN:
  80         case PM8606_LED2_BLUE:
  81                 ret = port - PM8606_LED2_RED + PM8606_RGB2B;
  82                 break;
  83         }
  84         return ret;
  85 }
  86
  87 /* return offset of blink register */
  88 static inline int __blink_off(int port)
  89 {
  90         int ret = -EINVAL;
  91
  92         switch (port) {
  93         case PM8606_LED1_RED:
  94         case PM8606_LED1_GREEN:
  95         case PM8606_LED1_BLUE:
  96                 ret = PM8606_RGB1A;
  97         case PM8606_LED2_RED:
  98         case PM8606_LED2_GREEN:
  99         case PM8606_LED2_BLUE:
 100                 ret = PM8606_RGB2A;
 101         }
 102         return ret;
 103 }
 104
 105 static inline int __blink_ctl_mask(int port)
 106 {
 107         int ret = -EINVAL;
 108
 109         switch (port) {
 110         case PM8606_LED1_RED:
 111         case PM8606_LED1_GREEN:
 112         case PM8606_LED1_BLUE:
 113                 ret = LED1_BLINK_EN;
 114                 break;
 115         case PM8606_LED2_RED:
 116         case PM8606_LED2_GREEN:
 117         case PM8606_LED2_BLUE:
 118                 ret = LED2_BLINK_EN;
 119                 break;
 120         }
 121         return ret;
 122 }
 123
 124 static int __led_set(struct pm860x_led *led, int command)
 125 {
 126         struct pm860x_chip *chip = led->chip;
 127         int mask, ret;
 128
 129         mutex_lock(&led->lock);
 130         switch (command) {
 131         case SET_BRIGHTNESS:
 132                 if ((led->current_brightness == 0) && led->brightness) {
 133                         if (led->iset) {
 134                                 ret = pm860x_set_bits(led->i2c, led->offset,
 135                                                 LED_CURRENT_MASK, led->iset);
 136                                 if (ret < 0)
 137                                         goto out;
 138                         }
 139                 } else if (led->brightness == 0) {
 140                         ret = pm860x_set_bits(led->i2c, led->offset,
 141                                                 LED_CURRENT_MASK, 0);
 142                         if (ret < 0)
 143                                 goto out;
 144                 }
 145                 ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
 146                                         led->brightness);
 147                 if (ret < 0)
 148                         goto out;
 149                 led->current_brightness = led->brightness;
 150                 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 151                         led->offset, led->brightness);
 152                 break;
 153         case SET_BLINK:
 154                 ret = pm860x_set_bits(led->i2c, led->offset,
 155                                 LED_BLINK_MASK, led->blink_data);
 156                 if (ret < 0)
 157                         goto out;
 158
 159                 mask = __blink_ctl_mask(led->port);
 160                 ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
 161                 if (ret < 0)
 162                         goto out;
 163                 dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
 164                         led->blink_on, led->blink_off);
 165                 break;
 166         }
 167 out:
 168         mutex_unlock(&led->lock);
 169         return 0;
 170 }
 171
 172 static void pm860x_led_work(struct work_struct *work)
 173 {
 174         struct pm860x_led *led;
 175
 176         led = container_of(work, struct pm860x_led, work);
 177         __led_set(led, led->command);
 178 }
 179
 180 static void pm860x_led_set(struct led_classdev *cdev,
 181                            enum led_brightness value)
 182 {
 183         struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
 184
 185         data->offset = __led_off(data->port);
 186         data->brightness = value >> 3;
 187         data->command = SET_BRIGHTNESS;
 188         schedule_work(&data->work);
 189 }
 190
 191 static int pm860x_led_blink(struct led_classdev *cdev,
 192                             unsigned long *delay_on,
 193                             unsigned long *delay_off)
 194 {
 195         struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
 196         int period, on;
 197
 198         on = *delay_on;
 199         if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX))
 200                 return -EINVAL;
 201
 202         on = LED_TO_ON(on);
 203         on = LED_BLINK_ON(on);
 204
 205         period = on + *delay_off;
 206         if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX))
 207                 return -EINVAL;
 208         period = LED_TO_PERIOD(period);
 209         period = LED_BLINK_PERIOD(period);
 210
 211         data->offset = __blink_off(data->port);
 212         data->blink_on = on;
 213         data->blink_off = period - data->blink_on;
 214         data->blink_data = (period << 3) | data->blink_on;
 215         data->command = SET_BLINK;
 216         schedule_work(&data->work);
 217
 218         return 0;
 219 }
 220
 221 static int __check_device(struct pm860x_led_pdata *pdata, char *name)
 222 {
 223         struct pm860x_led_pdata *p = pdata;
 224         int ret = -EINVAL;
 225
 226         while (p && p->id) {
 227                 if ((p->id != PM8606_ID_LED) || (p->flags < 0))
 228                         break;
 229
 230                 if (!strncmp(name, pm860x_led_name[p->flags],
 231                         MFD_NAME_SIZE)) {
 232                         ret = (int)p->flags;
 233                         break;
 234                 }
 235                 p++;
 236         }
 237         return ret;
 238 }
 239
 240 static int pm860x_led_probe(struct platform_device *pdev)
 241 {
 242         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 243         struct pm860x_platform_data *pm860x_pdata;
 244         struct pm860x_led_pdata *pdata;
 245         struct pm860x_led *data;
 246         struct resource *res;
 247         int ret;
 248
 249         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 250         if (res == NULL) {
 251                 dev_err(&pdev->dev, "No I/O resource!\n");
 252                 return -EINVAL;
 253         }
 254
 255         if (pdev->dev.parent->platform_data) {
 256                 pm860x_pdata = pdev->dev.parent->platform_data;
 257                 pdata = pm860x_pdata->led;
 258         } else
 259                 pdata = NULL;
 260
 261         data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
 262         if (data == NULL)
 263                 return -ENOMEM;
 264         strncpy(data->name, res->name, MFD_NAME_SIZE);
 265         dev_set_drvdata(&pdev->dev, data);
 266         data->chip = chip;
 267         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 268         data->iset = pdata->iset;
 269         data->port = __check_device(pdata, data->name);
 270         if (data->port < 0)
 271                 return -EINVAL;
 272
 273         data->current_brightness = 0;
 274         data->cdev.name = data->name;
 275         data->cdev.brightness_set = pm860x_led_set;
 276         data->cdev.blink_set = pm860x_led_blink;
 277         mutex_init(&data->lock);
 278         INIT_WORK(&data->work, pm860x_led_work);
 279
 280         ret = led_classdev_register(chip->dev, &data->cdev);
 281         if (ret < 0) {
 282                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 283                 goto out;
 284         }
 285         return 0;
 286 out:
 287         kfree(data);
 288         return ret;
 289 }
 290
 291 static int pm860x_led_remove(struct platform_device *pdev)
 292 {
 293         struct pm860x_led *data = platform_get_drvdata(pdev);
 294
 295         led_classdev_unregister(&data->cdev);
 296         kfree(data);
 297
 298         return 0;
 299 }
 300
 301 static struct platform_driver pm860x_led_driver = {
 302         .driver = {
 303                 .name   = "88pm860x-led",
 304                 .owner  = THIS_MODULE,
 305         },
 306         .probe  = pm860x_led_probe,
 307         .remove = pm860x_led_remove,
 308 };
 309
 310 static int __devinit pm860x_led_init(void)
 311 {
 312         return platform_driver_register(&pm860x_led_driver);
 313 }
 314 module_init(pm860x_led_init);
 315
 316 static void __devexit pm860x_led_exit(void)
 317 {
 318         platform_driver_unregister(&pm860x_led_driver);
 319 }
 320 module_exit(pm860x_led_exit);
 321
 322 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 323 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 324 MODULE_LICENSE("GPL");
 325 MODULE_ALIAS("platform:88pm860x-led");