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 #include <linux/module.h>
  17
  18 struct adp5520_bl {
  19         struct device *master;
  20         struct adp5520_backlight_platform_data *pdata;
  21         struct mutex lock;
  22         unsigned long cached_daylight_max;
  23         int id;
  24         int current_brightness;
  25 };
  26
  27 static int adp5520_bl_set(struct backlight_device *bl, int brightness)
  28 {
  29         struct adp5520_bl *data = bl_get_data(bl);
  30         struct device *master = data->master;
  31         int ret = 0;
  32
  33         if (data->pdata->en_ambl_sens) {
  34                 if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
  35                         /* Disable Ambient Light auto adjust */
  36                         ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
  37                                         ADP5520_BL_AUTO_ADJ);
  38                         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
  39                                         brightness);
  40                 } else {
  41                         /*
  42                          * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
  43                          * restore daylight l3 sysfs brightness
  44                          */
  45                         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
  46                                          data->cached_daylight_max);
  47                         ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
  48                                          ADP5520_BL_AUTO_ADJ);
  49                 }
  50         } else {
  51                 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
  52         }
  53
  54         if (data->current_brightness && brightness == 0)
  55                 ret |= adp5520_set_bits(master,
  56                                 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
  57         else if (data->current_brightness == 0 && brightness)
  58                 ret |= adp5520_clr_bits(master,
  59                                 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
  60
  61         if (!ret)
  62                 data->current_brightness = brightness;
  63
  64         return ret;
  65 }
  66
  67 static int adp5520_bl_update_status(struct backlight_device *bl)
  68 {
  69         int brightness = bl->props.brightness;
  70
  71         if (bl->props.power != FB_BLANK_UNBLANK)
  72                 brightness = 0;
  73
  74         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
  75                 brightness = 0;
  76
  77         return adp5520_bl_set(bl, brightness);
  78 }
  79
  80 static int adp5520_bl_get_brightness(struct backlight_device *bl)
  81 {
  82         struct adp5520_bl *data = bl_get_data(bl);
  83         int error;
  84         uint8_t reg_val;
  85
  86         error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);
  87
  88         return error ? data->current_brightness : reg_val;
  89 }
  90
  91 static const struct backlight_ops adp5520_bl_ops = {
  92         .update_status  = adp5520_bl_update_status,
  93         .get_brightness = adp5520_bl_get_brightness,
  94 };
  95
  96 static int adp5520_bl_setup(struct backlight_device *bl)
  97 {
  98         struct adp5520_bl *data = bl_get_data(bl);
  99         struct device *master = data->master;
 100         struct adp5520_backlight_platform_data *pdata = data->pdata;
 101         int ret = 0;
 102
 103         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
 104                                 pdata->l1_daylight_max);
 105         ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
 106                                 pdata->l1_daylight_dim);
 107
 108         if (pdata->en_ambl_sens) {
 109                 data->cached_daylight_max = pdata->l1_daylight_max;
 110                 ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
 111                                 pdata->l2_office_max);
 112                 ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
 113                                 pdata->l2_office_dim);
 114                 ret |= adp5520_write(master, ADP5520_DARK_MAX,
 115                                 pdata->l3_dark_max);
 116                 ret |= adp5520_write(master, ADP5520_DARK_DIM,
 117                                 pdata->l3_dark_dim);
 118                 ret |= adp5520_write(master, ADP5520_L2_TRIP,
 119                                 pdata->l2_trip);
 120                 ret |= adp5520_write(master, ADP5520_L2_HYS,
 121                                 pdata->l2_hyst);
 122                 ret |= adp5520_write(master, ADP5520_L3_TRIP,
 123                                  pdata->l3_trip);
 124                 ret |= adp5520_write(master, ADP5520_L3_HYS,
 125                                 pdata->l3_hyst);
 126                 ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
 127                                 ALS_CMPR_CFG_VAL(pdata->abml_filt,
 128                                 ADP5520_L3_EN));
 129         }
 130
 131         ret |= adp5520_write(master, ADP5520_BL_CONTROL,
 132                         BL_CTRL_VAL(pdata->fade_led_law,
 133                                         pdata->en_ambl_sens));
 134
 135         ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
 136                         pdata->fade_out));
 137
 138         ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
 139                         ADP5520_BL_EN | ADP5520_DIM_EN);
 140
 141         return ret;
 142 }
 143
 144 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
 145 {
 146         struct adp5520_bl *data = dev_get_drvdata(dev);
 147         int ret;
 148         uint8_t reg_val;
 149
 150         mutex_lock(&data->lock);
 151         ret = adp5520_read(data->master, reg, &reg_val);
 152         mutex_unlock(&data->lock);
 153
 154         if (ret < 0)
 155                 return ret;
 156
 157         return sprintf(buf, "%u\n", reg_val);
 158 }
 159
 160 static ssize_t adp5520_store(struct device *dev, const char *buf,
 161                          size_t count, int reg)
 162 {
 163         struct adp5520_bl *data = dev_get_drvdata(dev);
 164         unsigned long val;
 165         int ret;
 166
 167         ret = kstrtoul(buf, 10, &val);
 168         if (ret)
 169                 return ret;
 170
 171         mutex_lock(&data->lock);
 172         adp5520_write(data->master, reg, val);
 173         mutex_unlock(&data->lock);
 174
 175         return count;
 176 }
 177
 178 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
 179                         struct device_attribute *attr, char *buf)
 180 {
 181         return adp5520_show(dev, buf, ADP5520_DARK_MAX);
 182 }
 183
 184 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
 185                         struct device_attribute *attr,
 186                         const char *buf, size_t count)
 187 {
 188         return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
 189 }
 190 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
 191                         adp5520_bl_dark_max_store);
 192
 193 static ssize_t adp5520_bl_office_max_show(struct device *dev,
 194                         struct device_attribute *attr, char *buf)
 195 {
 196         return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
 197 }
 198
 199 static ssize_t adp5520_bl_office_max_store(struct device *dev,
 200                         struct device_attribute *attr,
 201                         const char *buf, size_t count)
 202 {
 203         return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
 204 }
 205 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
 206                         adp5520_bl_office_max_store);
 207
 208 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
 209                         struct device_attribute *attr, char *buf)
 210 {
 211         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
 212 }
 213
 214 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
 215                         struct device_attribute *attr,
 216                         const char *buf, size_t count)
 217 {
 218         struct adp5520_bl *data = dev_get_drvdata(dev);
 219         int ret;
 220
 221         ret = kstrtoul(buf, 10, &data->cached_daylight_max);
 222         if (ret < 0)
 223                 return ret;
 224
 225         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
 226 }
 227 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
 228                         adp5520_bl_daylight_max_store);
 229
 230 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
 231                         struct device_attribute *attr, char *buf)
 232 {
 233         return adp5520_show(dev, buf, ADP5520_DARK_DIM);
 234 }
 235
 236 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
 237                         struct device_attribute *attr,
 238                         const char *buf, size_t count)
 239 {
 240         return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
 241 }
 242 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
 243                         adp5520_bl_dark_dim_store);
 244
 245 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
 246                         struct device_attribute *attr, char *buf)
 247 {
 248         return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
 249 }
 250
 251 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
 252                         struct device_attribute *attr,
 253                         const char *buf, size_t count)
 254 {
 255         return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
 256 }
 257 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
 258                         adp5520_bl_office_dim_store);
 259
 260 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
 261                         struct device_attribute *attr, char *buf)
 262 {
 263         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
 264 }
 265
 266 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
 267                         struct device_attribute *attr,
 268                         const char *buf, size_t count)
 269 {
 270         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
 271 }
 272 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
 273                         adp5520_bl_daylight_dim_store);
 274
 275 static struct attribute *adp5520_bl_attributes[] = {
 276         &dev_attr_dark_max.attr,
 277         &dev_attr_dark_dim.attr,
 278         &dev_attr_office_max.attr,
 279         &dev_attr_office_dim.attr,
 280         &dev_attr_daylight_max.attr,
 281         &dev_attr_daylight_dim.attr,
 282         NULL
 283 };
 284
 285 static const struct attribute_group adp5520_bl_attr_group = {
 286         .attrs = adp5520_bl_attributes,
 287 };
 288
 289 static int adp5520_bl_probe(struct platform_device *pdev)
 290 {
 291         struct backlight_properties props;
 292         struct backlight_device *bl;
 293         struct adp5520_bl *data;
 294         int ret = 0;
 295
 296         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 297         if (data == NULL)
 298                 return -ENOMEM;
 299
 300         data->master = pdev->dev.parent;
 301         data->pdata = dev_get_platdata(&pdev->dev);
 302
 303         if (data->pdata  == NULL) {
 304                 dev_err(&pdev->dev, "missing platform data\n");
 305                 return -ENODEV;
 306         }
 307
 308         data->id = pdev->id;
 309         data->current_brightness = 0;
 310
 311         mutex_init(&data->lock);
 312
 313         memset(&props, 0, sizeof(struct backlight_properties));
 314         props.type = BACKLIGHT_RAW;
 315         props.max_brightness = ADP5020_MAX_BRIGHTNESS;
 316         bl = devm_backlight_device_register(&pdev->dev, pdev->name,
 317                                         data->master, data, &adp5520_bl_ops,
 318                                         &props);
 319         if (IS_ERR(bl)) {
 320                 dev_err(&pdev->dev, "failed to register backlight\n");
 321                 return PTR_ERR(bl);
 322         }
 323
 324         bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
 325         if (data->pdata->en_ambl_sens)
 326                 ret = sysfs_create_group(&bl->dev.kobj,
 327                         &adp5520_bl_attr_group);
 328
 329         if (ret) {
 330                 dev_err(&pdev->dev, "failed to register sysfs\n");
 331                 return ret;
 332         }
 333
 334         platform_set_drvdata(pdev, bl);
 335         ret |= adp5520_bl_setup(bl);
 336         backlight_update_status(bl);
 337
 338         return ret;
 339 }
 340
 341 static int adp5520_bl_remove(struct platform_device *pdev)
 342 {
 343         struct backlight_device *bl = platform_get_drvdata(pdev);
 344         struct adp5520_bl *data = bl_get_data(bl);
 345
 346         adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
 347
 348         if (data->pdata->en_ambl_sens)
 349                 sysfs_remove_group(&bl->dev.kobj,
 350                                 &adp5520_bl_attr_group);
 351
 352         return 0;
 353 }
 354
 355 #ifdef CONFIG_PM_SLEEP
 356 static int adp5520_bl_suspend(struct device *dev)
 357 {
 358         struct backlight_device *bl = dev_get_drvdata(dev);
 359
 360         return adp5520_bl_set(bl, 0);
 361 }
 362
 363 static int adp5520_bl_resume(struct device *dev)
 364 {
 365         struct backlight_device *bl = dev_get_drvdata(dev);
 366
 367         backlight_update_status(bl);
 368         return 0;
 369 }
 370 #endif
 371
 372 static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
 373                         adp5520_bl_resume);
 374
 375 static struct platform_driver adp5520_bl_driver = {
 376         .driver         = {
 377                 .name   = "adp5520-backlight",
 378                 .pm     = &adp5520_bl_pm_ops,
 379         },
 380         .probe          = adp5520_bl_probe,
 381         .remove         = adp5520_bl_remove,
 382 };
 383
 384 module_platform_driver(adp5520_bl_driver);
 385
 386 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 387 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
 388 MODULE_LICENSE("GPL");
 389 MODULE_ALIAS("platform:adp5520-backlight");