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_platfrom_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, BL_CONTROL, 35 BL_AUTO_ADJ); 36 ret |= adp5520_write(master, DAYLIGHT_MAX, brightness); 37 } else { 38 /* 39 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 40 * restore daylight l3 sysfs brightness 41 */ 42 ret |= adp5520_write(master, DAYLIGHT_MAX, 43 data->cached_daylight_max); 44 ret |= adp5520_set_bits(master, BL_CONTROL, 45 BL_AUTO_ADJ); 46 } 47 } else { 48 ret |= adp5520_write(master, DAYLIGHT_MAX, brightness); 49 } 50 51 if (data->current_brightness && brightness == 0) 52 ret |= adp5520_set_bits(master, 53 MODE_STATUS, DIM_EN); 54 else if (data->current_brightness == 0 && brightness) 55 ret |= adp5520_clr_bits(master, 56 MODE_STATUS, DIM_EN); 57 58 if (!ret) 59 data->current_brightness = brightness; 60 61 return ret; 62 } 63 64 static int adp5520_bl_update_status(struct backlight_device *bl) 65 { 66 int brightness = bl->props.brightness; 67 if (bl->props.power != FB_BLANK_UNBLANK) 68 brightness = 0; 69 70 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 71 brightness = 0; 72 73 return adp5520_bl_set(bl, brightness); 74 } 75 76 static int adp5520_bl_get_brightness(struct backlight_device *bl) 77 { 78 struct adp5520_bl *data = bl_get_data(bl); 79 int error; 80 uint8_t reg_val; 81 82 error = adp5520_read(data->master, BL_VALUE, ®_val); 83 84 return error ? data->current_brightness : reg_val; 85 } 86 87 static struct backlight_ops adp5520_bl_ops = { 88 .update_status = adp5520_bl_update_status, 89 .get_brightness = adp5520_bl_get_brightness, 90 }; 91 92 static int adp5520_bl_setup(struct backlight_device *bl) 93 { 94 struct adp5520_bl *data = bl_get_data(bl); 95 struct device *master = data->master; 96 struct adp5520_backlight_platfrom_data *pdata = data->pdata; 97 int ret = 0; 98 99 ret |= adp5520_write(master, DAYLIGHT_MAX, pdata->l1_daylight_max); 100 ret |= adp5520_write(master, DAYLIGHT_DIM, pdata->l1_daylight_dim); 101 102 if (pdata->en_ambl_sens) { 103 data->cached_daylight_max = pdata->l1_daylight_max; 104 ret |= adp5520_write(master, OFFICE_MAX, pdata->l2_office_max); 105 ret |= adp5520_write(master, OFFICE_DIM, pdata->l2_office_dim); 106 ret |= adp5520_write(master, DARK_MAX, pdata->l3_dark_max); 107 ret |= adp5520_write(master, DARK_DIM, pdata->l3_dark_dim); 108 ret |= adp5520_write(master, L2_TRIP, pdata->l2_trip); 109 ret |= adp5520_write(master, L2_HYS, pdata->l2_hyst); 110 ret |= adp5520_write(master, L3_TRIP, pdata->l3_trip); 111 ret |= adp5520_write(master, L3_HYS, pdata->l3_hyst); 112 ret |= adp5520_write(master, ALS_CMPR_CFG, 113 ALS_CMPR_CFG_VAL(pdata->abml_filt, L3_EN)); 114 } 115 116 ret |= adp5520_write(master, BL_CONTROL, 117 BL_CTRL_VAL(pdata->fade_led_law, pdata->en_ambl_sens)); 118 119 ret |= adp5520_write(master, BL_FADE, FADE_VAL(pdata->fade_in, 120 pdata->fade_out)); 121 122 ret |= adp5520_set_bits(master, MODE_STATUS, BL_EN | DIM_EN); 123 124 return ret; 125 } 126 127 static ssize_t adp5520_show(struct device *dev, char *buf, int reg) 128 { 129 struct adp5520_bl *data = dev_get_drvdata(dev); 130 int error; 131 uint8_t reg_val; 132 133 mutex_lock(&data->lock); 134 error = adp5520_read(data->master, reg, ®_val); 135 mutex_unlock(&data->lock); 136 137 return sprintf(buf, "%u\n", reg_val); 138 } 139 140 static ssize_t adp5520_store(struct device *dev, const char *buf, 141 size_t count, int reg) 142 { 143 struct adp5520_bl *data = dev_get_drvdata(dev); 144 unsigned long val; 145 int ret; 146 147 ret = strict_strtoul(buf, 10, &val); 148 if (ret) 149 return ret; 150 151 mutex_lock(&data->lock); 152 adp5520_write(data->master, reg, val); 153 mutex_unlock(&data->lock); 154 155 return count; 156 } 157 158 static ssize_t adp5520_bl_dark_max_show(struct device *dev, 159 struct device_attribute *attr, char *buf) 160 { 161 return adp5520_show(dev, buf, DARK_MAX); 162 } 163 164 static ssize_t adp5520_bl_dark_max_store(struct device *dev, 165 struct device_attribute *attr, const char *buf, size_t count) 166 { 167 return adp5520_store(dev, buf, count, DARK_MAX); 168 } 169 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show, 170 adp5520_bl_dark_max_store); 171 172 static ssize_t adp5520_bl_office_max_show(struct device *dev, 173 struct device_attribute *attr, char *buf) 174 { 175 return adp5520_show(dev, buf, OFFICE_MAX); 176 } 177 178 static ssize_t adp5520_bl_office_max_store(struct device *dev, 179 struct device_attribute *attr, const char *buf, size_t count) 180 { 181 return adp5520_store(dev, buf, count, OFFICE_MAX); 182 } 183 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show, 184 adp5520_bl_office_max_store); 185 186 static ssize_t adp5520_bl_daylight_max_show(struct device *dev, 187 struct device_attribute *attr, char *buf) 188 { 189 return adp5520_show(dev, buf, DAYLIGHT_MAX); 190 } 191 192 static ssize_t adp5520_bl_daylight_max_store(struct device *dev, 193 struct device_attribute *attr, const char *buf, size_t count) 194 { 195 struct adp5520_bl *data = dev_get_drvdata(dev); 196 197 strict_strtoul(buf, 10, &data->cached_daylight_max); 198 return adp5520_store(dev, buf, count, DAYLIGHT_MAX); 199 } 200 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show, 201 adp5520_bl_daylight_max_store); 202 203 static ssize_t adp5520_bl_dark_dim_show(struct device *dev, 204 struct device_attribute *attr, char *buf) 205 { 206 return adp5520_show(dev, buf, DARK_DIM); 207 } 208 209 static ssize_t adp5520_bl_dark_dim_store(struct device *dev, 210 struct device_attribute *attr, 211 const char *buf, size_t count) 212 { 213 return adp5520_store(dev, buf, count, DARK_DIM); 214 } 215 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show, 216 adp5520_bl_dark_dim_store); 217 218 static ssize_t adp5520_bl_office_dim_show(struct device *dev, 219 struct device_attribute *attr, char *buf) 220 { 221 return adp5520_show(dev, buf, OFFICE_DIM); 222 } 223 224 static ssize_t adp5520_bl_office_dim_store(struct device *dev, 225 struct device_attribute *attr, 226 const char *buf, size_t count) 227 { 228 return adp5520_store(dev, buf, count, OFFICE_DIM); 229 } 230 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show, 231 adp5520_bl_office_dim_store); 232 233 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev, 234 struct device_attribute *attr, char *buf) 235 { 236 return adp5520_show(dev, buf, DAYLIGHT_DIM); 237 } 238 239 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev, 240 struct device_attribute *attr, 241 const char *buf, size_t count) 242 { 243 return adp5520_store(dev, buf, count, DAYLIGHT_DIM); 244 } 245 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show, 246 adp5520_bl_daylight_dim_store); 247 248 static struct attribute *adp5520_bl_attributes[] = { 249 &dev_attr_dark_max.attr, 250 &dev_attr_dark_dim.attr, 251 &dev_attr_office_max.attr, 252 &dev_attr_office_dim.attr, 253 &dev_attr_daylight_max.attr, 254 &dev_attr_daylight_dim.attr, 255 NULL 256 }; 257 258 static const struct attribute_group adp5520_bl_attr_group = { 259 .attrs = adp5520_bl_attributes, 260 }; 261 262 static int __devinit adp5520_bl_probe(struct platform_device *pdev) 263 { 264 struct backlight_device *bl; 265 struct adp5520_bl *data; 266 int ret = 0; 267 268 data = kzalloc(sizeof(*data), GFP_KERNEL); 269 if (data == NULL) 270 return -ENOMEM; 271 272 data->master = pdev->dev.parent; 273 data->pdata = pdev->dev.platform_data; 274 275 if (data->pdata == NULL) { 276 dev_err(&pdev->dev, "missing platform data\n"); 277 kfree(data); 278 return -ENODEV; 279 } 280 281 data->id = pdev->id; 282 data->current_brightness = 0; 283 284 mutex_init(&data->lock); 285 286 bl = backlight_device_register(pdev->name, data->master, 287 data, &adp5520_bl_ops); 288 if (IS_ERR(bl)) { 289 dev_err(&pdev->dev, "failed to register backlight\n"); 290 kfree(data); 291 return PTR_ERR(bl); 292 } 293 294 bl->props.max_brightness = 295 bl->props.brightness = ADP5020_MAX_BRIGHTNESS; 296 297 if (data->pdata->en_ambl_sens) 298 ret = sysfs_create_group(&bl->dev.kobj, 299 &adp5520_bl_attr_group); 300 301 if (ret) { 302 dev_err(&pdev->dev, "failed to register sysfs\n"); 303 backlight_device_unregister(bl); 304 kfree(data); 305 } 306 307 platform_set_drvdata(pdev, bl); 308 ret |= adp5520_bl_setup(bl); 309 backlight_update_status(bl); 310 311 return ret; 312 } 313 314 static int __devexit adp5520_bl_remove(struct platform_device *pdev) 315 { 316 struct backlight_device *bl = platform_get_drvdata(pdev); 317 struct adp5520_bl *data = bl_get_data(bl); 318 319 adp5520_clr_bits(data->master, MODE_STATUS, BL_EN); 320 321 if (data->pdata->en_ambl_sens) 322 sysfs_remove_group(&bl->dev.kobj, 323 &adp5520_bl_attr_group); 324 325 backlight_device_unregister(bl); 326 kfree(data); 327 328 return 0; 329 } 330 331 #ifdef CONFIG_PM 332 static int adp5520_bl_suspend(struct platform_device *pdev, 333 pm_message_t state) 334 { 335 struct backlight_device *bl = platform_get_drvdata(pdev); 336 return adp5520_bl_set(bl, 0); 337 } 338 339 static int adp5520_bl_resume(struct platform_device *pdev) 340 { 341 struct backlight_device *bl = platform_get_drvdata(pdev); 342 343 backlight_update_status(bl); 344 return 0; 345 } 346 #else 347 #define adp5520_bl_suspend NULL 348 #define adp5520_bl_resume NULL 349 #endif 350 351 static struct platform_driver adp5520_bl_driver = { 352 .driver = { 353 .name = "adp5520-backlight", 354 .owner = THIS_MODULE, 355 }, 356 .probe = adp5520_bl_probe, 357 .remove = __devexit_p(adp5520_bl_remove), 358 .suspend = adp5520_bl_suspend, 359 .resume = adp5520_bl_resume, 360 }; 361 362 static int __init adp5520_bl_init(void) 363 { 364 return platform_driver_register(&adp5520_bl_driver); 365 } 366 module_init(adp5520_bl_init); 367 368 static void __exit adp5520_bl_exit(void) 369 { 370 platform_driver_unregister(&adp5520_bl_driver); 371 } 372 module_exit(adp5520_bl_exit); 373 374 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 375 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver"); 376 MODULE_LICENSE("GPL"); 377 MODULE_ALIAS("platform:adp5520-backlight"); 378