drivers/video/backlight/adp5520_bl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
   4  *
   5  * Copyright 2009 Analog Devices Inc.
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/fb.h>
  12 #include <linux/backlight.h>
  13 #include <linux/mfd/adp5520.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.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         return adp5520_bl_set(bl, backlight_get_brightness(bl));
  69 }
  70
  71 static int adp5520_bl_get_brightness(struct backlight_device *bl)
  72 {
  73         struct adp5520_bl *data = bl_get_data(bl);
  74         int error;
  75         uint8_t reg_val;
  76
  77         error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);
  78
  79         return error ? data->current_brightness : reg_val;
  80 }
  81
  82 static const struct backlight_ops adp5520_bl_ops = {
  83         .update_status  = adp5520_bl_update_status,
  84         .get_brightness = adp5520_bl_get_brightness,
  85 };
  86
  87 static int adp5520_bl_setup(struct backlight_device *bl)
  88 {
  89         struct adp5520_bl *data = bl_get_data(bl);
  90         struct device *master = data->master;
  91         struct adp5520_backlight_platform_data *pdata = data->pdata;
  92         int ret = 0;
  93
  94         ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
  95                                 pdata->l1_daylight_max);
  96         ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
  97                                 pdata->l1_daylight_dim);
  98
  99         if (pdata->en_ambl_sens) {
 100                 data->cached_daylight_max = pdata->l1_daylight_max;
 101                 ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
 102                                 pdata->l2_office_max);
 103                 ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
 104                                 pdata->l2_office_dim);
 105                 ret |= adp5520_write(master, ADP5520_DARK_MAX,
 106                                 pdata->l3_dark_max);
 107                 ret |= adp5520_write(master, ADP5520_DARK_DIM,
 108                                 pdata->l3_dark_dim);
 109                 ret |= adp5520_write(master, ADP5520_L2_TRIP,
 110                                 pdata->l2_trip);
 111                 ret |= adp5520_write(master, ADP5520_L2_HYS,
 112                                 pdata->l2_hyst);
 113                 ret |= adp5520_write(master, ADP5520_L3_TRIP,
 114                                  pdata->l3_trip);
 115                 ret |= adp5520_write(master, ADP5520_L3_HYS,
 116                                 pdata->l3_hyst);
 117                 ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
 118                                 ALS_CMPR_CFG_VAL(pdata->abml_filt,
 119                                 ADP5520_L3_EN));
 120         }
 121
 122         ret |= adp5520_write(master, ADP5520_BL_CONTROL,
 123                         BL_CTRL_VAL(pdata->fade_led_law,
 124                                         pdata->en_ambl_sens));
 125
 126         ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
 127                         pdata->fade_out));
 128
 129         ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
 130                         ADP5520_BL_EN | ADP5520_DIM_EN);
 131
 132         return ret;
 133 }
 134
 135 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
 136 {
 137         struct adp5520_bl *data = dev_get_drvdata(dev);
 138         int ret;
 139         uint8_t reg_val;
 140
 141         mutex_lock(&data->lock);
 142         ret = adp5520_read(data->master, reg, &reg_val);
 143         mutex_unlock(&data->lock);
 144
 145         if (ret < 0)
 146                 return ret;
 147
 148         return sprintf(buf, "%u\n", reg_val);
 149 }
 150
 151 static ssize_t adp5520_store(struct device *dev, const char *buf,
 152                          size_t count, int reg)
 153 {
 154         struct adp5520_bl *data = dev_get_drvdata(dev);
 155         unsigned long val;
 156         int ret;
 157
 158         ret = kstrtoul(buf, 10, &val);
 159         if (ret)
 160                 return ret;
 161
 162         mutex_lock(&data->lock);
 163         adp5520_write(data->master, reg, val);
 164         mutex_unlock(&data->lock);
 165
 166         return count;
 167 }
 168
 169 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
 170                         struct device_attribute *attr, char *buf)
 171 {
 172         return adp5520_show(dev, buf, ADP5520_DARK_MAX);
 173 }
 174
 175 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
 176                         struct device_attribute *attr,
 177                         const char *buf, size_t count)
 178 {
 179         return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
 180 }
 181 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
 182                         adp5520_bl_dark_max_store);
 183
 184 static ssize_t adp5520_bl_office_max_show(struct device *dev,
 185                         struct device_attribute *attr, char *buf)
 186 {
 187         return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
 188 }
 189
 190 static ssize_t adp5520_bl_office_max_store(struct device *dev,
 191                         struct device_attribute *attr,
 192                         const char *buf, size_t count)
 193 {
 194         return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
 195 }
 196 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
 197                         adp5520_bl_office_max_store);
 198
 199 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
 200                         struct device_attribute *attr, char *buf)
 201 {
 202         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
 203 }
 204
 205 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
 206                         struct device_attribute *attr,
 207                         const char *buf, size_t count)
 208 {
 209         struct adp5520_bl *data = dev_get_drvdata(dev);
 210         int ret;
 211
 212         ret = kstrtoul(buf, 10, &data->cached_daylight_max);
 213         if (ret < 0)
 214                 return ret;
 215
 216         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
 217 }
 218 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
 219                         adp5520_bl_daylight_max_store);
 220
 221 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
 222                         struct device_attribute *attr, char *buf)
 223 {
 224         return adp5520_show(dev, buf, ADP5520_DARK_DIM);
 225 }
 226
 227 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
 228                         struct device_attribute *attr,
 229                         const char *buf, size_t count)
 230 {
 231         return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
 232 }
 233 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
 234                         adp5520_bl_dark_dim_store);
 235
 236 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
 237                         struct device_attribute *attr, char *buf)
 238 {
 239         return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
 240 }
 241
 242 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
 243                         struct device_attribute *attr,
 244                         const char *buf, size_t count)
 245 {
 246         return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
 247 }
 248 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
 249                         adp5520_bl_office_dim_store);
 250
 251 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
 252                         struct device_attribute *attr, char *buf)
 253 {
 254         return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
 255 }
 256
 257 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
 258                         struct device_attribute *attr,
 259                         const char *buf, size_t count)
 260 {
 261         return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
 262 }
 263 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
 264                         adp5520_bl_daylight_dim_store);
 265
 266 static struct attribute *adp5520_bl_attributes[] = {
 267         &dev_attr_dark_max.attr,
 268         &dev_attr_dark_dim.attr,
 269         &dev_attr_office_max.attr,
 270         &dev_attr_office_dim.attr,
 271         &dev_attr_daylight_max.attr,
 272         &dev_attr_daylight_dim.attr,
 273         NULL
 274 };
 275
 276 static const struct attribute_group adp5520_bl_attr_group = {
 277         .attrs = adp5520_bl_attributes,
 278 };
 279
 280 static int adp5520_bl_probe(struct platform_device *pdev)
 281 {
 282         struct backlight_properties props;
 283         struct backlight_device *bl;
 284         struct adp5520_bl *data;
 285         int ret = 0;
 286
 287         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 288         if (data == NULL)
 289                 return -ENOMEM;
 290
 291         data->master = pdev->dev.parent;
 292         data->pdata = dev_get_platdata(&pdev->dev);
 293
 294         if (data->pdata  == NULL) {
 295                 dev_err(&pdev->dev, "missing platform data\n");
 296                 return -ENODEV;
 297         }
 298
 299         data->id = pdev->id;
 300         data->current_brightness = 0;
 301
 302         mutex_init(&data->lock);
 303
 304         memset(&props, 0, sizeof(struct backlight_properties));
 305         props.type = BACKLIGHT_RAW;
 306         props.max_brightness = ADP5020_MAX_BRIGHTNESS;
 307         bl = devm_backlight_device_register(&pdev->dev, pdev->name,
 308                                         data->master, data, &adp5520_bl_ops,
 309                                         &props);
 310         if (IS_ERR(bl)) {
 311                 dev_err(&pdev->dev, "failed to register backlight\n");
 312                 return PTR_ERR(bl);
 313         }
 314
 315         bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
 316         if (data->pdata->en_ambl_sens)
 317                 ret = sysfs_create_group(&bl->dev.kobj,
 318                         &adp5520_bl_attr_group);
 319
 320         if (ret) {
 321                 dev_err(&pdev->dev, "failed to register sysfs\n");
 322                 return ret;
 323         }
 324
 325         platform_set_drvdata(pdev, bl);
 326         ret = adp5520_bl_setup(bl);
 327         if (ret) {
 328                 dev_err(&pdev->dev, "failed to setup\n");
 329                 if (data->pdata->en_ambl_sens)
 330                         sysfs_remove_group(&bl->dev.kobj,
 331                                         &adp5520_bl_attr_group);
 332                 return ret;
 333         }
 334
 335         backlight_update_status(bl);
 336
 337         return 0;
 338 }
 339
 340 static int adp5520_bl_remove(struct platform_device *pdev)
 341 {
 342         struct backlight_device *bl = platform_get_drvdata(pdev);
 343         struct adp5520_bl *data = bl_get_data(bl);
 344
 345         adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
 346
 347         if (data->pdata->en_ambl_sens)
 348                 sysfs_remove_group(&bl->dev.kobj,
 349                                 &adp5520_bl_attr_group);
 350
 351         return 0;
 352 }
 353
 354 #ifdef CONFIG_PM_SLEEP
 355 static int adp5520_bl_suspend(struct device *dev)
 356 {
 357         struct backlight_device *bl = dev_get_drvdata(dev);
 358
 359         return adp5520_bl_set(bl, 0);
 360 }
 361
 362 static int adp5520_bl_resume(struct device *dev)
 363 {
 364         struct backlight_device *bl = dev_get_drvdata(dev);
 365
 366         backlight_update_status(bl);
 367         return 0;
 368 }
 369 #endif
 370
 371 static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
 372                         adp5520_bl_resume);
 373
 374 static struct platform_driver adp5520_bl_driver = {
 375         .driver         = {
 376                 .name   = "adp5520-backlight",
 377                 .pm     = &adp5520_bl_pm_ops,
 378         },
 379         .probe          = adp5520_bl_probe,
 380         .remove         = adp5520_bl_remove,
 381 };
 382
 383 module_platform_driver(adp5520_bl_driver);
 384
 385 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 386 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
 387 MODULE_LICENSE("GPL");
 388 MODULE_ALIAS("platform:adp5520-backlight");