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, ®_val); 84 85 return error ? data->current_brightness : reg_val; 86 } 87 88 static const 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, ®_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"); 395