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