drivers/video/backlight/adp5520_bl.c

   1 /*
   2  * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
   3  *
   4  * Copyright 2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/fb.h>
  13 #include <linux/backlight.h>
  14 #include <linux/mfd/adp5520.h>
  15 #include <linux/slab.h>
  16
  17 struct adp5520_bl {
  18         struct device *master;
  19         struct adp5520_backlight_platform_data *pdata;
  20         struct mutex lock;
  21         unsigned long cached_daylight_max;
  22         int id;
  23         int current_brightness;
  24 };
  25
  26 static int adp5520_bl_set(struct backlight_device *bl, int brightness)
  27 {
  28         struct adp5520_bl *data = bl_get_data(bl);
  29         struct device *master = data->master;
  30         int ret = 0;
  31
  32         if (data->pdata->en_ambl_sens) {
  33                 if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
  34                         /* Disable Ambient Light auto adjust */
  35                         ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
  36                                         ADP5520_BL_AUTO_ADJ);
  37                         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
  38                                         brightness);
  39                 } else {
  40                         /*
  41                          * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
  42                          * restore daylight l3 sysfs brightness
  43                          */
  44                         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
  45                                          data->cached_daylight_max);
  46                         ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
  47                                          ADP5520_BL_AUTO_ADJ);
  48                 }
  49         } else {
  50                 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
  51         }
  52
  53         if (data->current_brightness && brightness == 0)
  54                 ret |= adp5520_set_bits(master,
  55                                 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
  56         else if (data->current_brightness == 0 && brightness)
  57                 ret |= adp5520_clr_bits(master,
  58                                 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
  59
  60         if (!ret)
  61                 data->current_brightness = brightness;
  62
  63         return ret;
  64 }
  65
  66 static int adp5520_bl_update_status(struct backlight_device *bl)
  67 {
  68         int brightness = bl->props.brightness;
  69         if (bl->props.power != FB_BLANK_UNBLANK)
  70                 brightness = 0;
  71
  72         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
  73                 brightness = 0;
  74
  75         return adp5520_bl_set(bl, brightness);
  76 }
  77
  78 static int adp5520_bl_get_brightness(struct backlight_device *bl)
  79 {
  80         struct adp5520_bl *data = bl_get_data(bl);
  81         int error;
  82         uint8_t reg_val;
  83
  84         error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);
  85
  86         return error ? data->current_brightness : reg_val;
  87 }
  88
  89 static const struct backlight_ops adp5520_bl_ops = {
  90         .update_status  = adp5520_bl_update_status,
  91         .get_brightness = adp5520_bl_get_brightness,
  92 };
  93
  94 static int adp5520_bl_setup(struct backlight_device *bl)
  95 {
  96         struct adp5520_bl *data = bl_get_data(bl);
  97         struct device *master = data->master;
  98         struct adp5520_backlight_platform_data *pdata = data->pdata;
  99         int ret = 0;
 100
 101         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
 102                                 pdata->l1_daylight_max);
 103         ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
 104                                 pdata->l1_daylight_dim);
 105
 106         if (pdata->en_ambl_sens) {
 107                 data->cached_daylight_max = pdata->l1_daylight_max;
 108                 ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
 109                                 pdata->l2_office_max);
 110                 ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
 111                                 pdata->l2_office_dim);
 112                 ret |= adp5520_write(master, ADP5520_DARK_MAX,
 113                                 pdata->l3_dark_max);
 114                 ret |= adp5520_write(master, ADP5520_DARK_DIM,
 115                                 pdata->l3_dark_dim);
 116                 ret |= adp5520_write(master, ADP5520_L2_TRIP,
 117                                 pdata->l2_trip);
 118                 ret |= adp5520_write(master, ADP5520_L2_HYS,
 119                                 pdata->l2_hyst);
 120                 ret |= adp5520_write(master, ADP5520_L3_TRIP,
 121                                  pdata->l3_trip);
 122                 ret |= adp5520_write(master, ADP5520_L3_HYS,
 123                                 pdata->l3_hyst);
 124                 ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
 125                                 ALS_CMPR_CFG_VAL(pdata->abml_filt,
 126                                 ADP5520_L3_EN));
 127         }
 128
 129         ret |= adp5520_write(master, ADP5520_BL_CONTROL,
 130                         BL_CTRL_VAL(pdata->fade_led_law,
 131                                         pdata->en_ambl_sens));
 132
 133         ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
 134                         pdata->fade_out));
 135
 136         ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
 137                         ADP5520_BL_EN | ADP5520_DIM_EN);
 138
 139         return ret;
 140 }
 141
 142 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
 143 {
 144         struct adp5520_bl *data = dev_get_drvdata(dev);
 145         int error;
 146         uint8_t reg_val;
 147
 148         mutex_lock(&data->lock);
 149         error = adp5520_read(data->master, reg, &reg_val);
 150         mutex_unlock(&data->lock);
 151
 152         return sprintf(buf, "%u\n", reg_val);
 153 }
 154
 155 static ssize_t adp5520_store(struct device *dev, const char *buf,
 156                          size_t count, int reg)
 157 {
 158         struct adp5520_bl *data = dev_get_drvdata(dev);
 159         unsigned long val;
 160         int ret;
 161
 162         ret = strict_strtoul(buf, 10, &val);
 163         if (ret)
 164                 return ret;
 165
 166         mutex_lock(&data->lock);
 167         adp5520_write(data->master, reg, val);
 168         mutex_unlock(&data->lock);
 169
 170         return count;
 171 }
 172
 173 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
 174                         struct device_attribute *attr, char *buf)
 175 {
 176         return adp5520_show(dev, buf, ADP5520_DARK_MAX);
 177 }
 178
 179 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
 180                         struct device_attribute *attr,
 181                         const char *buf, size_t count)
 182 {
 183         return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
 184 }
 185 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
 186                         adp5520_bl_dark_max_store);
 187
 188 static ssize_t adp5520_bl_office_max_show(struct device *dev,
 189                         struct device_attribute *attr, char *buf)
 190 {
 191         return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
 192 }
 193
 194 static ssize_t adp5520_bl_office_max_store(struct device *dev,
 195                         struct device_attribute *attr,
 196                         const char *buf, size_t count)
 197 {
 198         return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
 199 }
 200 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
 201                         adp5520_bl_office_max_store);
 202
 203 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
 204                         struct device_attribute *attr, char *buf)
 205 {
 206         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
 207 }
 208
 209 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
 210                         struct device_attribute *attr,
 211                         const char *buf, size_t count)
 212 {
 213         struct adp5520_bl *data = dev_get_drvdata(dev);
 214         int ret;
 215
 216         ret = strict_strtoul(buf, 10, &data->cached_daylight_max);
 217         if (ret < 0)
 218                 return ret;
 219
 220         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
 221 }
 222 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
 223                         adp5520_bl_daylight_max_store);
 224
 225 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
 226                         struct device_attribute *attr, char *buf)
 227 {
 228         return adp5520_show(dev, buf, ADP5520_DARK_DIM);
 229 }
 230
 231 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
 232                         struct device_attribute *attr,
 233                         const char *buf, size_t count)
 234 {
 235         return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
 236 }
 237 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
 238                         adp5520_bl_dark_dim_store);
 239
 240 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
 241                         struct device_attribute *attr, char *buf)
 242 {
 243         return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
 244 }
 245
 246 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
 247                         struct device_attribute *attr,
 248                         const char *buf, size_t count)
 249 {
 250         return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
 251 }
 252 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
 253                         adp5520_bl_office_dim_store);
 254
 255 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
 256                         struct device_attribute *attr, char *buf)
 257 {
 258         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
 259 }
 260
 261 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
 262                         struct device_attribute *attr,
 263                         const char *buf, size_t count)
 264 {
 265         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
 266 }
 267 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
 268                         adp5520_bl_daylight_dim_store);
 269
 270 static struct attribute *adp5520_bl_attributes[] = {
 271         &dev_attr_dark_max.attr,
 272         &dev_attr_dark_dim.attr,
 273         &dev_attr_office_max.attr,
 274         &dev_attr_office_dim.attr,
 275         &dev_attr_daylight_max.attr,
 276         &dev_attr_daylight_dim.attr,
 277         NULL
 278 };
 279
 280 static const struct attribute_group adp5520_bl_attr_group = {
 281         .attrs = adp5520_bl_attributes,
 282 };
 283
 284 static int __devinit adp5520_bl_probe(struct platform_device *pdev)
 285 {
 286         struct backlight_properties props;
 287         struct backlight_device *bl;
 288         struct adp5520_bl *data;
 289         int ret = 0;
 290
 291         data = kzalloc(sizeof(*data), GFP_KERNEL);
 292         if (data == NULL)
 293                 return -ENOMEM;
 294
 295         data->master = pdev->dev.parent;
 296         data->pdata = pdev->dev.platform_data;
 297
 298         if (data->pdata  == NULL) {
 299                 dev_err(&pdev->dev, "missing platform data\n");
 300                 kfree(data);
 301                 return -ENODEV;
 302         }
 303
 304         data->id = pdev->id;
 305         data->current_brightness = 0;
 306
 307         mutex_init(&data->lock);
 308
 309         memset(&props, 0, sizeof(struct backlight_properties));
 310         props.type = BACKLIGHT_RAW;
 311         props.max_brightness = ADP5020_MAX_BRIGHTNESS;
 312         bl = backlight_device_register(pdev->name, data->master, data,
 313                                        &adp5520_bl_ops, &props);
 314         if (IS_ERR(bl)) {
 315                 dev_err(&pdev->dev, "failed to register backlight\n");
 316                 kfree(data);
 317                 return PTR_ERR(bl);
 318         }
 319
 320         bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
 321         if (data->pdata->en_ambl_sens)
 322                 ret = sysfs_create_group(&bl->dev.kobj,
 323                         &adp5520_bl_attr_group);
 324
 325         if (ret) {
 326                 dev_err(&pdev->dev, "failed to register sysfs\n");
 327                 backlight_device_unregister(bl);
 328                 kfree(data);
 329         }
 330
 331         platform_set_drvdata(pdev, bl);
 332         ret |= adp5520_bl_setup(bl);
 333         backlight_update_status(bl);
 334
 335         return ret;
 336 }
 337
 338 static int __devexit adp5520_bl_remove(struct platform_device *pdev)
 339 {
 340         struct backlight_device *bl = platform_get_drvdata(pdev);
 341         struct adp5520_bl *data = bl_get_data(bl);
 342
 343         adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
 344
 345         if (data->pdata->en_ambl_sens)
 346                 sysfs_remove_group(&bl->dev.kobj,
 347                                 &adp5520_bl_attr_group);
 348
 349         backlight_device_unregister(bl);
 350         kfree(data);
 351
 352         return 0;
 353 }
 354
 355 #ifdef CONFIG_PM
 356 static int adp5520_bl_suspend(struct platform_device *pdev,
 357                                  pm_message_t state)
 358 {
 359         struct backlight_device *bl = platform_get_drvdata(pdev);
 360         return adp5520_bl_set(bl, 0);
 361 }
 362
 363 static int adp5520_bl_resume(struct platform_device *pdev)
 364 {
 365         struct backlight_device *bl = platform_get_drvdata(pdev);
 366
 367         backlight_update_status(bl);
 368         return 0;
 369 }
 370 #else
 371 #define adp5520_bl_suspend      NULL
 372 #define adp5520_bl_resume       NULL
 373 #endif
 374
 375 static struct platform_driver adp5520_bl_driver = {
 376         .driver         = {
 377                 .name   = "adp5520-backlight",
 378                 .owner  = THIS_MODULE,
 379         },
 380         .probe          = adp5520_bl_probe,
 381         .remove         = __devexit_p(adp5520_bl_remove),
 382         .suspend        = adp5520_bl_suspend,
 383         .resume         = adp5520_bl_resume,
 384 };
 385
 386 static int __init adp5520_bl_init(void)
 387 {
 388         return platform_driver_register(&adp5520_bl_driver);
 389 }
 390 module_init(adp5520_bl_init);
 391
 392 static void __exit adp5520_bl_exit(void)
 393 {
 394         platform_driver_unregister(&adp5520_bl_driver);
 395 }
 396 module_exit(adp5520_bl_exit);
 397
 398 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 399 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
 400 MODULE_LICENSE("GPL");
 401 MODULE_ALIAS("platform:adp5520-backlight");