Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Backlight Lowlevel Control Abstraction |
| 3 | * |
| 4 | * Copyright (C) 2003,2004 Hewlett-Packard Company |
| 5 | * |
| 6 | */ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/backlight.h> |
| 12 | #include <linux/notifier.h> |
| 13 | #include <linux/ctype.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/fb.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 17 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 18 | #include <asm/backlight.h> |
| 19 | #endif |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 20 | |
| 21 | #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ |
| 22 | defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)) |
| 23 | /* This callback gets called when something important happens inside a |
| 24 | * framebuffer driver. We're looking if that important event is blanking, |
| 25 | * and if it is, we're switching backlight power as well ... |
| 26 | */ |
| 27 | static int fb_notifier_callback(struct notifier_block *self, |
| 28 | unsigned long event, void *data) |
| 29 | { |
| 30 | struct backlight_device *bd; |
| 31 | struct fb_event *evdata = data; |
| 32 | |
| 33 | /* If we aren't interested in this event, skip it immediately ... */ |
Richard Purdie | 994efac | 2007-02-09 09:46:45 +0000 | [diff] [blame] | 34 | if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK) |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 35 | return 0; |
| 36 | |
| 37 | bd = container_of(self, struct backlight_device, fb_notif); |
Andrea Righi | 66c1ca0 | 2009-03-31 15:25:18 -0700 | [diff] [blame] | 38 | if (!lock_fb_info(evdata->info)) |
| 39 | return -ENODEV; |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 40 | mutex_lock(&bd->ops_lock); |
| 41 | if (bd->ops) |
| 42 | if (!bd->ops->check_fb || |
| 43 | bd->ops->check_fb(evdata->info)) { |
| 44 | bd->props.fb_blank = *(int *)evdata->data; |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 45 | if (bd->props.fb_blank == FB_BLANK_UNBLANK) |
| 46 | bd->props.state &= ~BL_CORE_FBBLANK; |
| 47 | else |
| 48 | bd->props.state |= BL_CORE_FBBLANK; |
Richard Purdie | 28ee086 | 2007-02-08 22:25:09 +0000 | [diff] [blame] | 49 | backlight_update_status(bd); |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 50 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 51 | mutex_unlock(&bd->ops_lock); |
Andrea Righi | 66c1ca0 | 2009-03-31 15:25:18 -0700 | [diff] [blame] | 52 | unlock_fb_info(evdata->info); |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int backlight_register_fb(struct backlight_device *bd) |
| 57 | { |
| 58 | memset(&bd->fb_notif, 0, sizeof(bd->fb_notif)); |
| 59 | bd->fb_notif.notifier_call = fb_notifier_callback; |
| 60 | |
| 61 | return fb_register_client(&bd->fb_notif); |
| 62 | } |
| 63 | |
| 64 | static void backlight_unregister_fb(struct backlight_device *bd) |
| 65 | { |
| 66 | fb_unregister_client(&bd->fb_notif); |
| 67 | } |
| 68 | #else |
| 69 | static inline int backlight_register_fb(struct backlight_device *bd) |
| 70 | { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static inline void backlight_unregister_fb(struct backlight_device *bd) |
| 75 | { |
| 76 | } |
| 77 | #endif /* CONFIG_FB */ |
| 78 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 79 | static ssize_t backlight_show_power(struct device *dev, |
| 80 | struct device_attribute *attr,char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 82 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 84 | return sprintf(buf, "%d\n", bd->props.power); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 87 | static ssize_t backlight_store_power(struct device *dev, |
| 88 | struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 90 | int rc; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 91 | struct backlight_device *bd = to_backlight_device(dev); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 92 | unsigned long power; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 94 | rc = strict_strtoul(buf, 0, &power); |
| 95 | if (rc) |
| 96 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 98 | rc = -ENXIO; |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 99 | mutex_lock(&bd->ops_lock); |
| 100 | if (bd->ops) { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 101 | pr_debug("backlight: set power to %lu\n", power); |
Helge Deller | 5155245 | 2008-01-13 23:01:13 +0000 | [diff] [blame] | 102 | if (bd->props.power != power) { |
| 103 | bd->props.power = power; |
| 104 | backlight_update_status(bd); |
| 105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | rc = count; |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 107 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 108 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | return rc; |
| 111 | } |
| 112 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 113 | static ssize_t backlight_show_brightness(struct device *dev, |
| 114 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 116 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 118 | return sprintf(buf, "%d\n", bd->props.brightness); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 121 | static ssize_t backlight_store_brightness(struct device *dev, |
| 122 | struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 124 | int rc; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 125 | struct backlight_device *bd = to_backlight_device(dev); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 126 | unsigned long brightness; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 128 | rc = strict_strtoul(buf, 0, &brightness); |
| 129 | if (rc) |
| 130 | return rc; |
| 131 | |
| 132 | rc = -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 134 | mutex_lock(&bd->ops_lock); |
| 135 | if (bd->ops) { |
| 136 | if (brightness > bd->props.max_brightness) |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 137 | rc = -EINVAL; |
| 138 | else { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 139 | pr_debug("backlight: set brightness to %lu\n", |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 140 | brightness); |
Zhang Rui | 9be1df9 | 2009-01-08 14:11:30 +0000 | [diff] [blame] | 141 | bd->props.brightness = brightness; |
| 142 | backlight_update_status(bd); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 143 | rc = count; |
| 144 | } |
| 145 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 146 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | return rc; |
| 149 | } |
| 150 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 151 | static ssize_t backlight_show_max_brightness(struct device *dev, |
| 152 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 154 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 156 | return sprintf(buf, "%d\n", bd->props.max_brightness); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 157 | } |
| 158 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 159 | static ssize_t backlight_show_actual_brightness(struct device *dev, |
| 160 | struct device_attribute *attr, char *buf) |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 161 | { |
| 162 | int rc = -ENXIO; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 163 | struct backlight_device *bd = to_backlight_device(dev); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 164 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 165 | mutex_lock(&bd->ops_lock); |
| 166 | if (bd->ops && bd->ops->get_brightness) |
| 167 | rc = sprintf(buf, "%d\n", bd->ops->get_brightness(bd)); |
| 168 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | return rc; |
| 171 | } |
| 172 | |
Adrian Bunk | 0ad90ef | 2007-08-11 10:27:19 +0100 | [diff] [blame] | 173 | static struct class *backlight_class; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 174 | |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 175 | static int backlight_suspend(struct device *dev, pm_message_t state) |
| 176 | { |
| 177 | struct backlight_device *bd = to_backlight_device(dev); |
| 178 | |
| 179 | if (bd->ops->options & BL_CORE_SUSPENDRESUME) { |
| 180 | mutex_lock(&bd->ops_lock); |
| 181 | bd->props.state |= BL_CORE_SUSPENDED; |
| 182 | backlight_update_status(bd); |
| 183 | mutex_unlock(&bd->ops_lock); |
| 184 | } |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int backlight_resume(struct device *dev) |
| 190 | { |
| 191 | struct backlight_device *bd = to_backlight_device(dev); |
| 192 | |
| 193 | if (bd->ops->options & BL_CORE_SUSPENDRESUME) { |
| 194 | mutex_lock(&bd->ops_lock); |
| 195 | bd->props.state &= ~BL_CORE_SUSPENDED; |
| 196 | backlight_update_status(bd); |
| 197 | mutex_unlock(&bd->ops_lock); |
| 198 | } |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 203 | static void bl_device_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
| 205 | struct backlight_device *bd = to_backlight_device(dev); |
| 206 | kfree(bd); |
| 207 | } |
| 208 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 209 | static struct device_attribute bl_device_attributes[] = { |
| 210 | __ATTR(bl_power, 0644, backlight_show_power, backlight_store_power), |
| 211 | __ATTR(brightness, 0644, backlight_show_brightness, |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 212 | backlight_store_brightness), |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 213 | __ATTR(actual_brightness, 0444, backlight_show_actual_brightness, |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 214 | NULL), |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 215 | __ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL), |
| 216 | __ATTR_NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | }; |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | /** |
| 220 | * backlight_device_register - create and register a new object of |
| 221 | * backlight_device class. |
| 222 | * @name: the name of the new object(must be the same as the name of the |
| 223 | * respective framebuffer device). |
Sebastian Siewior | f6ec2d9 | 2008-07-16 23:05:49 +0100 | [diff] [blame] | 224 | * @parent: a pointer to the parent device |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 225 | * @devdata: an optional pointer to be stored for private driver use. The |
| 226 | * methods may retrieve it by using bl_get_data(bd). |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 227 | * @ops: the backlight operations structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | * |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 229 | * Creates and registers new backlight device. Returns either an |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | * ERR_PTR() or a pointer to the newly allocated device. |
| 231 | */ |
Yu Luming | 519ab5f | 2006-12-19 12:56:15 -0800 | [diff] [blame] | 232 | struct backlight_device *backlight_device_register(const char *name, |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 233 | struct device *parent, void *devdata, struct backlight_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | struct backlight_device *new_bd; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 236 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 238 | pr_debug("backlight_device_register: name=%s\n", name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 240 | new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL); |
Dmitry Torokhov | 90968e8 | 2007-02-08 00:12:28 +0000 | [diff] [blame] | 241 | if (!new_bd) |
Jean Delvare | 10ad1b7 | 2006-03-09 17:33:36 -0800 | [diff] [blame] | 242 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Richard Purdie | 28ee086 | 2007-02-08 22:25:09 +0000 | [diff] [blame] | 244 | mutex_init(&new_bd->update_lock); |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 245 | mutex_init(&new_bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 247 | new_bd->dev.class = backlight_class; |
| 248 | new_bd->dev.parent = parent; |
| 249 | new_bd->dev.release = bl_device_release; |
Kay Sievers | 64dba9a | 2009-01-06 10:44:35 -0800 | [diff] [blame] | 250 | dev_set_name(&new_bd->dev, name); |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 251 | dev_set_drvdata(&new_bd->dev, devdata); |
| 252 | |
| 253 | rc = device_register(&new_bd->dev); |
Dmitry Torokhov | 90968e8 | 2007-02-08 00:12:28 +0000 | [diff] [blame] | 254 | if (rc) { |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 255 | kfree(new_bd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return ERR_PTR(rc); |
| 257 | } |
| 258 | |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 259 | rc = backlight_register_fb(new_bd); |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 260 | if (rc) { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 261 | device_unregister(&new_bd->dev); |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 262 | return ERR_PTR(rc); |
| 263 | } |
| 264 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 265 | new_bd->ops = ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 267 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 268 | mutex_lock(&pmac_backlight_mutex); |
| 269 | if (!pmac_backlight) |
| 270 | pmac_backlight = new_bd; |
| 271 | mutex_unlock(&pmac_backlight_mutex); |
| 272 | #endif |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return new_bd; |
| 275 | } |
| 276 | EXPORT_SYMBOL(backlight_device_register); |
| 277 | |
| 278 | /** |
| 279 | * backlight_device_unregister - unregisters a backlight device object. |
| 280 | * @bd: the backlight device object to be unregistered and freed. |
| 281 | * |
| 282 | * Unregisters a previously registered via backlight_device_register object. |
| 283 | */ |
| 284 | void backlight_device_unregister(struct backlight_device *bd) |
| 285 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (!bd) |
| 287 | return; |
| 288 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 289 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 290 | mutex_lock(&pmac_backlight_mutex); |
| 291 | if (pmac_backlight == bd) |
| 292 | pmac_backlight = NULL; |
| 293 | mutex_unlock(&pmac_backlight_mutex); |
| 294 | #endif |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 295 | mutex_lock(&bd->ops_lock); |
| 296 | bd->ops = NULL; |
| 297 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 299 | backlight_unregister_fb(bd); |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 300 | device_unregister(&bd->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
| 302 | EXPORT_SYMBOL(backlight_device_unregister); |
| 303 | |
| 304 | static void __exit backlight_class_exit(void) |
| 305 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 306 | class_destroy(backlight_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | static int __init backlight_class_init(void) |
| 310 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 311 | backlight_class = class_create(THIS_MODULE, "backlight"); |
| 312 | if (IS_ERR(backlight_class)) { |
| 313 | printk(KERN_WARNING "Unable to create backlight class; errno = %ld\n", |
| 314 | PTR_ERR(backlight_class)); |
| 315 | return PTR_ERR(backlight_class); |
| 316 | } |
| 317 | |
| 318 | backlight_class->dev_attrs = bl_device_attributes; |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 319 | backlight_class->suspend = backlight_suspend; |
| 320 | backlight_class->resume = backlight_resume; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 321 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | /* |
| 325 | * if this is compiled into the kernel, we need to ensure that the |
| 326 | * class is registered before users of the class try to register lcd's |
| 327 | */ |
| 328 | postcore_initcall(backlight_class_init); |
| 329 | module_exit(backlight_class_exit); |
| 330 | |
| 331 | MODULE_LICENSE("GPL"); |
| 332 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); |
| 333 | MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction"); |