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 | |
Jingoo Han | 35f9616 | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/backlight.h> |
| 14 | #include <linux/notifier.h> |
| 15 | #include <linux/ctype.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/fb.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 20 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 21 | #include <asm/backlight.h> |
| 22 | #endif |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 23 | |
Bart Van Assche | c338bfb | 2011-09-10 20:13:01 +0200 | [diff] [blame] | 24 | static const char *const backlight_types[] = { |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 25 | [BACKLIGHT_RAW] = "raw", |
| 26 | [BACKLIGHT_PLATFORM] = "platform", |
| 27 | [BACKLIGHT_FIRMWARE] = "firmware", |
| 28 | }; |
| 29 | |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 30 | #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ |
| 31 | defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)) |
| 32 | /* This callback gets called when something important happens inside a |
| 33 | * framebuffer driver. We're looking if that important event is blanking, |
| 34 | * and if it is, we're switching backlight power as well ... |
| 35 | */ |
| 36 | static int fb_notifier_callback(struct notifier_block *self, |
| 37 | unsigned long event, void *data) |
| 38 | { |
| 39 | struct backlight_device *bd; |
| 40 | struct fb_event *evdata = data; |
| 41 | |
| 42 | /* If we aren't interested in this event, skip it immediately ... */ |
Richard Purdie | 994efac | 2007-02-09 09:46:45 +0000 | [diff] [blame] | 43 | if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK) |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 44 | return 0; |
| 45 | |
| 46 | bd = container_of(self, struct backlight_device, fb_notif); |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 47 | mutex_lock(&bd->ops_lock); |
| 48 | if (bd->ops) |
| 49 | if (!bd->ops->check_fb || |
Bruno Prémont | 57e148b | 2010-02-21 00:20:01 +0100 | [diff] [blame] | 50 | bd->ops->check_fb(bd, evdata->info)) { |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 51 | bd->props.fb_blank = *(int *)evdata->data; |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 52 | if (bd->props.fb_blank == FB_BLANK_UNBLANK) |
| 53 | bd->props.state &= ~BL_CORE_FBBLANK; |
| 54 | else |
| 55 | bd->props.state |= BL_CORE_FBBLANK; |
Richard Purdie | 28ee086 | 2007-02-08 22:25:09 +0000 | [diff] [blame] | 56 | backlight_update_status(bd); |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 57 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 58 | mutex_unlock(&bd->ops_lock); |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static int backlight_register_fb(struct backlight_device *bd) |
| 63 | { |
| 64 | memset(&bd->fb_notif, 0, sizeof(bd->fb_notif)); |
| 65 | bd->fb_notif.notifier_call = fb_notifier_callback; |
| 66 | |
| 67 | return fb_register_client(&bd->fb_notif); |
| 68 | } |
| 69 | |
| 70 | static void backlight_unregister_fb(struct backlight_device *bd) |
| 71 | { |
| 72 | fb_unregister_client(&bd->fb_notif); |
| 73 | } |
| 74 | #else |
| 75 | static inline int backlight_register_fb(struct backlight_device *bd) |
| 76 | { |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static inline void backlight_unregister_fb(struct backlight_device *bd) |
| 81 | { |
| 82 | } |
| 83 | #endif /* CONFIG_FB */ |
| 84 | |
Matthew Garrett | 325253a | 2009-07-14 17:06:02 +0100 | [diff] [blame] | 85 | static void backlight_generate_event(struct backlight_device *bd, |
| 86 | enum backlight_update_reason reason) |
| 87 | { |
| 88 | char *envp[2]; |
| 89 | |
| 90 | switch (reason) { |
| 91 | case BACKLIGHT_UPDATE_SYSFS: |
| 92 | envp[0] = "SOURCE=sysfs"; |
| 93 | break; |
| 94 | case BACKLIGHT_UPDATE_HOTKEY: |
| 95 | envp[0] = "SOURCE=hotkey"; |
| 96 | break; |
| 97 | default: |
| 98 | envp[0] = "SOURCE=unknown"; |
| 99 | break; |
| 100 | } |
| 101 | envp[1] = NULL; |
| 102 | kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp); |
Henrique de Moraes Holschuh | 89dfc28 | 2009-09-20 14:44:47 -0300 | [diff] [blame] | 103 | sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness"); |
Matthew Garrett | 325253a | 2009-07-14 17:06:02 +0100 | [diff] [blame] | 104 | } |
| 105 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 106 | static ssize_t backlight_show_power(struct device *dev, |
Jingoo Han | 6665576 | 2012-01-10 15:09:19 -0800 | [diff] [blame] | 107 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 109 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 111 | return sprintf(buf, "%d\n", bd->props.power); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 114 | static ssize_t backlight_store_power(struct device *dev, |
| 115 | struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 117 | int rc; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 118 | struct backlight_device *bd = to_backlight_device(dev); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 119 | unsigned long power; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Jingoo Han | 6665576 | 2012-01-10 15:09:19 -0800 | [diff] [blame] | 121 | rc = kstrtoul(buf, 0, &power); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 122 | if (rc) |
| 123 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 125 | rc = -ENXIO; |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 126 | mutex_lock(&bd->ops_lock); |
| 127 | if (bd->ops) { |
Jingoo Han | 35f9616 | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 128 | pr_debug("set power to %lu\n", power); |
Helge Deller | 5155245 | 2008-01-13 23:01:13 +0000 | [diff] [blame] | 129 | if (bd->props.power != power) { |
| 130 | bd->props.power = power; |
| 131 | backlight_update_status(bd); |
| 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | rc = count; |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 134 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 135 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | return rc; |
| 138 | } |
| 139 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 140 | static ssize_t backlight_show_brightness(struct device *dev, |
| 141 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 143 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 145 | return sprintf(buf, "%d\n", bd->props.brightness); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 148 | static ssize_t backlight_store_brightness(struct device *dev, |
| 149 | struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 151 | int rc; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 152 | struct backlight_device *bd = to_backlight_device(dev); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 153 | unsigned long brightness; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Jingoo Han | 6665576 | 2012-01-10 15:09:19 -0800 | [diff] [blame] | 155 | rc = kstrtoul(buf, 0, &brightness); |
Pavel Machek | 9a2c61a | 2008-12-03 08:43:48 +0000 | [diff] [blame] | 156 | if (rc) |
| 157 | return rc; |
| 158 | |
| 159 | rc = -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 161 | mutex_lock(&bd->ops_lock); |
| 162 | if (bd->ops) { |
| 163 | if (brightness > bd->props.max_brightness) |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 164 | rc = -EINVAL; |
| 165 | else { |
Jingoo Han | 35f9616 | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 166 | pr_debug("set brightness to %lu\n", brightness); |
Zhang Rui | 9be1df9 | 2009-01-08 14:11:30 +0000 | [diff] [blame] | 167 | bd->props.brightness = brightness; |
| 168 | backlight_update_status(bd); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 169 | rc = count; |
| 170 | } |
| 171 | } |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 172 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Matthew Garrett | 325253a | 2009-07-14 17:06:02 +0100 | [diff] [blame] | 174 | backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS); |
| 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | return rc; |
| 177 | } |
| 178 | |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 179 | static ssize_t backlight_show_type(struct device *dev, |
| 180 | struct device_attribute *attr, char *buf) |
| 181 | { |
| 182 | struct backlight_device *bd = to_backlight_device(dev); |
| 183 | |
| 184 | return sprintf(buf, "%s\n", backlight_types[bd->props.type]); |
| 185 | } |
| 186 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 187 | static ssize_t backlight_show_max_brightness(struct device *dev, |
| 188 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 190 | struct backlight_device *bd = to_backlight_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 192 | return sprintf(buf, "%d\n", bd->props.max_brightness); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 193 | } |
| 194 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 195 | static ssize_t backlight_show_actual_brightness(struct device *dev, |
| 196 | struct device_attribute *attr, char *buf) |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 197 | { |
| 198 | int rc = -ENXIO; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 199 | struct backlight_device *bd = to_backlight_device(dev); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 200 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 201 | mutex_lock(&bd->ops_lock); |
| 202 | if (bd->ops && bd->ops->get_brightness) |
| 203 | rc = sprintf(buf, "%d\n", bd->ops->get_brightness(bd)); |
| 204 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | return rc; |
| 207 | } |
| 208 | |
Adrian Bunk | 0ad90ef | 2007-08-11 10:27:19 +0100 | [diff] [blame] | 209 | static struct class *backlight_class; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 210 | |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 211 | static int backlight_suspend(struct device *dev, pm_message_t state) |
| 212 | { |
| 213 | struct backlight_device *bd = to_backlight_device(dev); |
| 214 | |
Uwe Kleine-König | d1d7357 | 2010-11-24 12:57:14 -0800 | [diff] [blame] | 215 | mutex_lock(&bd->ops_lock); |
| 216 | if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) { |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 217 | bd->props.state |= BL_CORE_SUSPENDED; |
| 218 | backlight_update_status(bd); |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 219 | } |
Uwe Kleine-König | d1d7357 | 2010-11-24 12:57:14 -0800 | [diff] [blame] | 220 | mutex_unlock(&bd->ops_lock); |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | static int backlight_resume(struct device *dev) |
| 226 | { |
| 227 | struct backlight_device *bd = to_backlight_device(dev); |
| 228 | |
Uwe Kleine-König | d1d7357 | 2010-11-24 12:57:14 -0800 | [diff] [blame] | 229 | mutex_lock(&bd->ops_lock); |
| 230 | if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) { |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 231 | bd->props.state &= ~BL_CORE_SUSPENDED; |
| 232 | backlight_update_status(bd); |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 233 | } |
Uwe Kleine-König | d1d7357 | 2010-11-24 12:57:14 -0800 | [diff] [blame] | 234 | mutex_unlock(&bd->ops_lock); |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 239 | static void bl_device_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
| 241 | struct backlight_device *bd = to_backlight_device(dev); |
| 242 | kfree(bd); |
| 243 | } |
| 244 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 245 | static struct device_attribute bl_device_attributes[] = { |
| 246 | __ATTR(bl_power, 0644, backlight_show_power, backlight_store_power), |
| 247 | __ATTR(brightness, 0644, backlight_show_brightness, |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 248 | backlight_store_brightness), |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 249 | __ATTR(actual_brightness, 0444, backlight_show_actual_brightness, |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame] | 250 | NULL), |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 251 | __ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL), |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 252 | __ATTR(type, 0444, backlight_show_type, NULL), |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 253 | __ATTR_NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | }; |
| 255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | /** |
Matthew Garrett | 325253a | 2009-07-14 17:06:02 +0100 | [diff] [blame] | 257 | * backlight_force_update - tell the backlight subsystem that hardware state |
| 258 | * has changed |
| 259 | * @bd: the backlight device to update |
| 260 | * |
| 261 | * Updates the internal state of the backlight in response to a hardware event, |
| 262 | * and generate a uevent to notify userspace |
| 263 | */ |
| 264 | void backlight_force_update(struct backlight_device *bd, |
| 265 | enum backlight_update_reason reason) |
| 266 | { |
| 267 | mutex_lock(&bd->ops_lock); |
| 268 | if (bd->ops && bd->ops->get_brightness) |
| 269 | bd->props.brightness = bd->ops->get_brightness(bd); |
| 270 | mutex_unlock(&bd->ops_lock); |
| 271 | backlight_generate_event(bd, reason); |
| 272 | } |
| 273 | EXPORT_SYMBOL(backlight_force_update); |
| 274 | |
| 275 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | * backlight_device_register - create and register a new object of |
| 277 | * backlight_device class. |
| 278 | * @name: the name of the new object(must be the same as the name of the |
| 279 | * respective framebuffer device). |
Sebastian Siewior | f6ec2d9 | 2008-07-16 23:05:49 +0100 | [diff] [blame] | 280 | * @parent: a pointer to the parent device |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 281 | * @devdata: an optional pointer to be stored for private driver use. The |
| 282 | * methods may retrieve it by using bl_get_data(bd). |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 283 | * @ops: the backlight operations structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | * |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 285 | * Creates and registers new backlight device. Returns either an |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | * ERR_PTR() or a pointer to the newly allocated device. |
| 287 | */ |
Yu Luming | 519ab5f | 2006-12-19 12:56:15 -0800 | [diff] [blame] | 288 | struct backlight_device *backlight_device_register(const char *name, |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 289 | struct device *parent, void *devdata, const struct backlight_ops *ops, |
| 290 | const struct backlight_properties *props) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | struct backlight_device *new_bd; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 293 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 295 | pr_debug("backlight_device_register: name=%s\n", name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 297 | new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL); |
Dmitry Torokhov | 90968e8 | 2007-02-08 00:12:28 +0000 | [diff] [blame] | 298 | if (!new_bd) |
Jean Delvare | 10ad1b7 | 2006-03-09 17:33:36 -0800 | [diff] [blame] | 299 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Richard Purdie | 28ee086 | 2007-02-08 22:25:09 +0000 | [diff] [blame] | 301 | mutex_init(&new_bd->update_lock); |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 302 | mutex_init(&new_bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 304 | new_bd->dev.class = backlight_class; |
| 305 | new_bd->dev.parent = parent; |
| 306 | new_bd->dev.release = bl_device_release; |
Kay Sievers | 64dba9a | 2009-01-06 10:44:35 -0800 | [diff] [blame] | 307 | dev_set_name(&new_bd->dev, name); |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 308 | dev_set_drvdata(&new_bd->dev, devdata); |
| 309 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 310 | /* Set default properties */ |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 311 | if (props) { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 312 | memcpy(&new_bd->props, props, |
| 313 | sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 314 | if (props->type <= 0 || props->type >= BACKLIGHT_TYPE_MAX) { |
| 315 | WARN(1, "%s: invalid backlight type", name); |
| 316 | new_bd->props.type = BACKLIGHT_RAW; |
| 317 | } |
| 318 | } else { |
| 319 | new_bd->props.type = BACKLIGHT_RAW; |
| 320 | } |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 321 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 322 | rc = device_register(&new_bd->dev); |
Dmitry Torokhov | 90968e8 | 2007-02-08 00:12:28 +0000 | [diff] [blame] | 323 | if (rc) { |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 324 | kfree(new_bd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | return ERR_PTR(rc); |
| 326 | } |
| 327 | |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 328 | rc = backlight_register_fb(new_bd); |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 329 | if (rc) { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 330 | device_unregister(&new_bd->dev); |
Dmitry Torokhov | 2fd5a15 | 2007-02-07 22:25:50 +0000 | [diff] [blame] | 331 | return ERR_PTR(rc); |
| 332 | } |
| 333 | |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 334 | new_bd->ops = ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 336 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 337 | mutex_lock(&pmac_backlight_mutex); |
| 338 | if (!pmac_backlight) |
| 339 | pmac_backlight = new_bd; |
| 340 | mutex_unlock(&pmac_backlight_mutex); |
| 341 | #endif |
| 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return new_bd; |
| 344 | } |
| 345 | EXPORT_SYMBOL(backlight_device_register); |
| 346 | |
| 347 | /** |
| 348 | * backlight_device_unregister - unregisters a backlight device object. |
| 349 | * @bd: the backlight device object to be unregistered and freed. |
| 350 | * |
| 351 | * Unregisters a previously registered via backlight_device_register object. |
| 352 | */ |
| 353 | void backlight_device_unregister(struct backlight_device *bd) |
| 354 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | if (!bd) |
| 356 | return; |
| 357 | |
Richard Purdie | 321709c | 2007-02-10 15:04:08 +0000 | [diff] [blame] | 358 | #ifdef CONFIG_PMAC_BACKLIGHT |
| 359 | mutex_lock(&pmac_backlight_mutex); |
| 360 | if (pmac_backlight == bd) |
| 361 | pmac_backlight = NULL; |
| 362 | mutex_unlock(&pmac_backlight_mutex); |
| 363 | #endif |
Richard Purdie | 599a52d | 2007-02-10 23:07:48 +0000 | [diff] [blame] | 364 | mutex_lock(&bd->ops_lock); |
| 365 | bd->ops = NULL; |
| 366 | mutex_unlock(&bd->ops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
James Simmons | 3d5eead | 2006-12-08 02:40:47 -0800 | [diff] [blame] | 368 | backlight_unregister_fb(bd); |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 369 | device_unregister(&bd->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | EXPORT_SYMBOL(backlight_device_unregister); |
| 372 | |
Thierry Reding | 762a936 | 2012-12-17 16:01:06 -0800 | [diff] [blame] | 373 | #ifdef CONFIG_OF |
| 374 | static int of_parent_match(struct device *dev, void *data) |
| 375 | { |
| 376 | return dev->parent && dev->parent->of_node == data; |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * of_find_backlight_by_node() - find backlight device by device-tree node |
| 381 | * @node: device-tree node of the backlight device |
| 382 | * |
| 383 | * Returns a pointer to the backlight device corresponding to the given DT |
| 384 | * node or NULL if no such backlight device exists or if the device hasn't |
| 385 | * been probed yet. |
| 386 | * |
| 387 | * This function obtains a reference on the backlight device and it is the |
| 388 | * caller's responsibility to drop the reference by calling put_device() on |
| 389 | * the backlight device's .dev field. |
| 390 | */ |
| 391 | struct backlight_device *of_find_backlight_by_node(struct device_node *node) |
| 392 | { |
| 393 | struct device *dev; |
| 394 | |
| 395 | dev = class_find_device(backlight_class, NULL, node, of_parent_match); |
| 396 | |
| 397 | return dev ? to_backlight_device(dev) : NULL; |
| 398 | } |
| 399 | EXPORT_SYMBOL(of_find_backlight_by_node); |
| 400 | #endif |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | static void __exit backlight_class_exit(void) |
| 403 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 404 | class_destroy(backlight_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | static int __init backlight_class_init(void) |
| 408 | { |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 409 | backlight_class = class_create(THIS_MODULE, "backlight"); |
| 410 | if (IS_ERR(backlight_class)) { |
Jingoo Han | 35f9616 | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 411 | pr_warn("Unable to create backlight class; errno = %ld\n", |
| 412 | PTR_ERR(backlight_class)); |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 413 | return PTR_ERR(backlight_class); |
| 414 | } |
| 415 | |
| 416 | backlight_class->dev_attrs = bl_device_attributes; |
Richard Purdie | c835ee7 | 2009-01-06 21:00:19 +0000 | [diff] [blame] | 417 | backlight_class->suspend = backlight_suspend; |
| 418 | backlight_class->resume = backlight_resume; |
Richard Purdie | 655bfd7 | 2007-07-09 12:17:24 +0100 | [diff] [blame] | 419 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | /* |
| 423 | * if this is compiled into the kernel, we need to ensure that the |
| 424 | * class is registered before users of the class try to register lcd's |
| 425 | */ |
| 426 | postcore_initcall(backlight_class_init); |
| 427 | module_exit(backlight_class_exit); |
| 428 | |
| 429 | MODULE_LICENSE("GPL"); |
| 430 | MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>"); |
| 431 | MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction"); |