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