Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/platform/x86/ideapad-laptop.c

  1 /*
  2  *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
  3  *
  4  *  Copyright © 2010 Intel Corporation
  5  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License as published by
  9  *  the Free Software Foundation; either version 2 of the License, or
 10  *  (at your option) any later version.
 11  *
 12  *  This program is distributed in the hope that it will be useful,
 13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *  GNU General Public License for more details.
 16  *
 17  *  You should have received a copy of the GNU General Public License
 18  *  along with this program; if not, write to the Free Software
 19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 20  *  02110-1301, USA.
 21  */
 22 
 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/module.h>
 27 #include <linux/init.h>
 28 #include <linux/types.h>
 29 #include <linux/acpi.h>
 30 #include <linux/rfkill.h>
 31 #include <linux/platform_device.h>
 32 #include <linux/input.h>
 33 #include <linux/input/sparse-keymap.h>
 34 #include <linux/backlight.h>
 35 #include <linux/fb.h>
 36 #include <linux/debugfs.h>
 37 #include <linux/seq_file.h>
 38 #include <linux/i8042.h>
 39 
 40 #define IDEAPAD_RFKILL_DEV_NUM  (3)
 41 
 42 #define CFG_BT_BIT      (16)
 43 #define CFG_3G_BIT      (17)
 44 #define CFG_WIFI_BIT    (18)
 45 #define CFG_CAMERA_BIT  (19)
 46 
 47 enum {
 48         VPCCMD_R_VPC1 = 0x10,
 49         VPCCMD_R_BL_MAX,
 50         VPCCMD_R_BL,
 51         VPCCMD_W_BL,
 52         VPCCMD_R_WIFI,
 53         VPCCMD_W_WIFI,
 54         VPCCMD_R_BT,
 55         VPCCMD_W_BT,
 56         VPCCMD_R_BL_POWER,
 57         VPCCMD_R_NOVO,
 58         VPCCMD_R_VPC2,
 59         VPCCMD_R_TOUCHPAD,
 60         VPCCMD_W_TOUCHPAD,
 61         VPCCMD_R_CAMERA,
 62         VPCCMD_W_CAMERA,
 63         VPCCMD_R_3G,
 64         VPCCMD_W_3G,
 65         VPCCMD_R_ODD, /* 0x21 */
 66         VPCCMD_W_FAN,
 67         VPCCMD_R_RF,
 68         VPCCMD_W_RF,
 69         VPCCMD_R_FAN = 0x2B,
 70         VPCCMD_R_SPECIAL_BUTTONS = 0x31,
 71         VPCCMD_W_BL_POWER = 0x33,
 72 };
 73 
 74 struct ideapad_rfk_priv {
 75         int dev;
 76         struct ideapad_private *priv;
 77 };
 78 
 79 struct ideapad_private {
 80         struct acpi_device *adev;
 81         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
 82         struct ideapad_rfk_priv rfk_priv[IDEAPAD_RFKILL_DEV_NUM];
 83         struct platform_device *platform_device;
 84         struct input_dev *inputdev;
 85         struct backlight_device *blightdev;
 86         struct dentry *debug;
 87         unsigned long cfg;
 88 };
 89 
 90 static bool no_bt_rfkill;
 91 module_param(no_bt_rfkill, bool, 0444);
 92 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
 93 
 94 /*
 95  * ACPI Helpers
 96  */
 97 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
 98 
 99 static int read_method_int(acpi_handle handle, const char *method, int *val)
100 {
101         acpi_status status;
102         unsigned long long result;
103 
104         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
105         if (ACPI_FAILURE(status)) {
106                 *val = -1;
107                 return -1;
108         } else {
109                 *val = result;
110                 return 0;
111         }
112 }
113 
114 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
115 {
116         acpi_status status;
117         unsigned long long result;
118         struct acpi_object_list params;
119         union acpi_object in_obj;
120 
121         params.count = 1;
122         params.pointer = &in_obj;
123         in_obj.type = ACPI_TYPE_INTEGER;
124         in_obj.integer.value = cmd;
125 
126         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
127 
128         if (ACPI_FAILURE(status)) {
129                 *ret = -1;
130                 return -1;
131         } else {
132                 *ret = result;
133                 return 0;
134         }
135 }
136 
137 static int method_vpcw(acpi_handle handle, int cmd, int data)
138 {
139         struct acpi_object_list params;
140         union acpi_object in_obj[2];
141         acpi_status status;
142 
143         params.count = 2;
144         params.pointer = in_obj;
145         in_obj[0].type = ACPI_TYPE_INTEGER;
146         in_obj[0].integer.value = cmd;
147         in_obj[1].type = ACPI_TYPE_INTEGER;
148         in_obj[1].integer.value = data;
149 
150         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
151         if (status != AE_OK)
152                 return -1;
153         return 0;
154 }
155 
156 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
157 {
158         int val;
159         unsigned long int end_jiffies;
160 
161         if (method_vpcw(handle, 1, cmd))
162                 return -1;
163 
164         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
165              time_before(jiffies, end_jiffies);) {
166                 schedule();
167                 if (method_vpcr(handle, 1, &val))
168                         return -1;
169                 if (val == 0) {
170                         if (method_vpcr(handle, 0, &val))
171                                 return -1;
172                         *data = val;
173                         return 0;
174                 }
175         }
176         pr_err("timeout in read_ec_cmd\n");
177         return -1;
178 }
179 
180 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
181 {
182         int val;
183         unsigned long int end_jiffies;
184 
185         if (method_vpcw(handle, 0, data))
186                 return -1;
187         if (method_vpcw(handle, 1, cmd))
188                 return -1;
189 
190         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
191              time_before(jiffies, end_jiffies);) {
192                 schedule();
193                 if (method_vpcr(handle, 1, &val))
194                         return -1;
195                 if (val == 0)
196                         return 0;
197         }
198         pr_err("timeout in write_ec_cmd\n");
199         return -1;
200 }
201 
202 /*
203  * debugfs
204  */
205 static int debugfs_status_show(struct seq_file *s, void *data)
206 {
207         struct ideapad_private *priv = s->private;
208         unsigned long value;
209 
210         if (!priv)
211                 return -EINVAL;
212 
213         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value))
214                 seq_printf(s, "Backlight max:\t%lu\n", value);
215         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value))
216                 seq_printf(s, "Backlight now:\t%lu\n", value);
217         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value))
218                 seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
219         seq_printf(s, "=====================\n");
220 
221         if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value))
222                 seq_printf(s, "Radio status:\t%s(%lu)\n",
223                            value ? "On" : "Off", value);
224         if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value))
225                 seq_printf(s, "Wifi status:\t%s(%lu)\n",
226                            value ? "On" : "Off", value);
227         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value))
228                 seq_printf(s, "BT status:\t%s(%lu)\n",
229                            value ? "On" : "Off", value);
230         if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value))
231                 seq_printf(s, "3G status:\t%s(%lu)\n",
232                            value ? "On" : "Off", value);
233         seq_printf(s, "=====================\n");
234 
235         if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value))
236                 seq_printf(s, "Touchpad status:%s(%lu)\n",
237                            value ? "On" : "Off", value);
238         if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))
239                 seq_printf(s, "Camera status:\t%s(%lu)\n",
240                            value ? "On" : "Off", value);
241 
242         return 0;
243 }
244 
245 static int debugfs_status_open(struct inode *inode, struct file *file)
246 {
247         return single_open(file, debugfs_status_show, inode->i_private);
248 }
249 
250 static const struct file_operations debugfs_status_fops = {
251         .owner = THIS_MODULE,
252         .open = debugfs_status_open,
253         .read = seq_read,
254         .llseek = seq_lseek,
255         .release = single_release,
256 };
257 
258 static int debugfs_cfg_show(struct seq_file *s, void *data)
259 {
260         struct ideapad_private *priv = s->private;
261 
262         if (!priv) {
263                 seq_printf(s, "cfg: N/A\n");
264         } else {
265                 seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
266                            priv->cfg);
267                 if (test_bit(CFG_BT_BIT, &priv->cfg))
268                         seq_printf(s, "Bluetooth ");
269                 if (test_bit(CFG_3G_BIT, &priv->cfg))
270                         seq_printf(s, "3G ");
271                 if (test_bit(CFG_WIFI_BIT, &priv->cfg))
272                         seq_printf(s, "Wireless ");
273                 if (test_bit(CFG_CAMERA_BIT, &priv->cfg))
274                         seq_printf(s, "Camera ");
275                 seq_printf(s, "\nGraphic: ");
276                 switch ((priv->cfg)&0x700) {
277                 case 0x100:
278                         seq_printf(s, "Intel");
279                         break;
280                 case 0x200:
281                         seq_printf(s, "ATI");
282                         break;
283                 case 0x300:
284                         seq_printf(s, "Nvidia");
285                         break;
286                 case 0x400:
287                         seq_printf(s, "Intel and ATI");
288                         break;
289                 case 0x500:
290                         seq_printf(s, "Intel and Nvidia");
291                         break;
292                 }
293                 seq_printf(s, "\n");
294         }
295         return 0;
296 }
297 
298 static int debugfs_cfg_open(struct inode *inode, struct file *file)
299 {
300         return single_open(file, debugfs_cfg_show, inode->i_private);
301 }
302 
303 static const struct file_operations debugfs_cfg_fops = {
304         .owner = THIS_MODULE,
305         .open = debugfs_cfg_open,
306         .read = seq_read,
307         .llseek = seq_lseek,
308         .release = single_release,
309 };
310 
311 static int ideapad_debugfs_init(struct ideapad_private *priv)
312 {
313         struct dentry *node;
314 
315         priv->debug = debugfs_create_dir("ideapad", NULL);
316         if (priv->debug == NULL) {
317                 pr_err("failed to create debugfs directory");
318                 goto errout;
319         }
320 
321         node = debugfs_create_file("cfg", S_IRUGO, priv->debug, priv,
322                                    &debugfs_cfg_fops);
323         if (!node) {
324                 pr_err("failed to create cfg in debugfs");
325                 goto errout;
326         }
327 
328         node = debugfs_create_file("status", S_IRUGO, priv->debug, priv,
329                                    &debugfs_status_fops);
330         if (!node) {
331                 pr_err("failed to create status in debugfs");
332                 goto errout;
333         }
334 
335         return 0;
336 
337 errout:
338         return -ENOMEM;
339 }
340 
341 static void ideapad_debugfs_exit(struct ideapad_private *priv)
342 {
343         debugfs_remove_recursive(priv->debug);
344         priv->debug = NULL;
345 }
346 
347 /*
348  * sysfs
349  */
350 static ssize_t show_ideapad_cam(struct device *dev,
351                                 struct device_attribute *attr,
352                                 char *buf)
353 {
354         unsigned long result;
355         struct ideapad_private *priv = dev_get_drvdata(dev);
356 
357         if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result))
358                 return sprintf(buf, "-1\n");
359         return sprintf(buf, "%lu\n", result);
360 }
361 
362 static ssize_t store_ideapad_cam(struct device *dev,
363                                  struct device_attribute *attr,
364                                  const char *buf, size_t count)
365 {
366         int ret, state;
367         struct ideapad_private *priv = dev_get_drvdata(dev);
368 
369         if (!count)
370                 return 0;
371         if (sscanf(buf, "%i", &state) != 1)
372                 return -EINVAL;
373         ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state);
374         if (ret < 0)
375                 return -EIO;
376         return count;
377 }
378 
379 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
380 
381 static ssize_t show_ideapad_fan(struct device *dev,
382                                 struct device_attribute *attr,
383                                 char *buf)
384 {
385         unsigned long result;
386         struct ideapad_private *priv = dev_get_drvdata(dev);
387 
388         if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result))
389                 return sprintf(buf, "-1\n");
390         return sprintf(buf, "%lu\n", result);
391 }
392 
393 static ssize_t store_ideapad_fan(struct device *dev,
394                                  struct device_attribute *attr,
395                                  const char *buf, size_t count)
396 {
397         int ret, state;
398         struct ideapad_private *priv = dev_get_drvdata(dev);
399 
400         if (!count)
401                 return 0;
402         if (sscanf(buf, "%i", &state) != 1)
403                 return -EINVAL;
404         if (state < 0 || state > 4 || state == 3)
405                 return -EINVAL;
406         ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state);
407         if (ret < 0)
408                 return -EIO;
409         return count;
410 }
411 
412 static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
413 
414 static struct attribute *ideapad_attributes[] = {
415         &dev_attr_camera_power.attr,
416         &dev_attr_fan_mode.attr,
417         NULL
418 };
419 
420 static umode_t ideapad_is_visible(struct kobject *kobj,
421                                  struct attribute *attr,
422                                  int idx)
423 {
424         struct device *dev = container_of(kobj, struct device, kobj);
425         struct ideapad_private *priv = dev_get_drvdata(dev);
426         bool supported;
427 
428         if (attr == &dev_attr_camera_power.attr)
429                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
430         else if (attr == &dev_attr_fan_mode.attr) {
431                 unsigned long value;
432                 supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,
433                                           &value);
434         } else
435                 supported = true;
436 
437         return supported ? attr->mode : 0;
438 }
439 
440 static struct attribute_group ideapad_attribute_group = {
441         .is_visible = ideapad_is_visible,
442         .attrs = ideapad_attributes
443 };
444 
445 /*
446  * Rfkill
447  */
448 struct ideapad_rfk_data {
449         char *name;
450         int cfgbit;
451         int opcode;
452         int type;
453 };
454 
455 const struct ideapad_rfk_data ideapad_rfk_data[] = {
456         { "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
457         { "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
458         { "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
459 };
460 
461 static int ideapad_rfk_set(void *data, bool blocked)
462 {
463         struct ideapad_rfk_priv *priv = data;
464 
465         return write_ec_cmd(priv->priv->adev->handle, priv->dev, !blocked);
466 }
467 
468 static struct rfkill_ops ideapad_rfk_ops = {
469         .set_block = ideapad_rfk_set,
470 };
471 
472 static void ideapad_sync_rfk_state(struct ideapad_private *priv)
473 {
474         unsigned long hw_blocked;
475         int i;
476 
477         if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked))
478                 return;
479         hw_blocked = !hw_blocked;
480 
481         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
482                 if (priv->rfk[i])
483                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
484 }
485 
486 static int ideapad_register_rfkill(struct ideapad_private *priv, int dev)
487 {
488         int ret;
489         unsigned long sw_blocked;
490 
491         if (no_bt_rfkill &&
492             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
493                 /* Force to enable bluetooth when no_bt_rfkill=1 */
494                 write_ec_cmd(priv->adev->handle,
495                              ideapad_rfk_data[dev].opcode, 1);
496                 return 0;
497         }
498         priv->rfk_priv[dev].dev = dev;
499         priv->rfk_priv[dev].priv = priv;
500 
501         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name,
502                                       &priv->platform_device->dev,
503                                       ideapad_rfk_data[dev].type,
504                                       &ideapad_rfk_ops,
505                                       &priv->rfk_priv[dev]);
506         if (!priv->rfk[dev])
507                 return -ENOMEM;
508 
509         if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1,
510                          &sw_blocked)) {
511                 rfkill_init_sw_state(priv->rfk[dev], 0);
512         } else {
513                 sw_blocked = !sw_blocked;
514                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
515         }
516 
517         ret = rfkill_register(priv->rfk[dev]);
518         if (ret) {
519                 rfkill_destroy(priv->rfk[dev]);
520                 return ret;
521         }
522         return 0;
523 }
524 
525 static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev)
526 {
527         if (!priv->rfk[dev])
528                 return;
529 
530         rfkill_unregister(priv->rfk[dev]);
531         rfkill_destroy(priv->rfk[dev]);
532 }
533 
534 /*
535  * Platform device
536  */
537 static int ideapad_sysfs_init(struct ideapad_private *priv)
538 {
539         return sysfs_create_group(&priv->platform_device->dev.kobj,
540                                     &ideapad_attribute_group);
541 }
542 
543 static void ideapad_sysfs_exit(struct ideapad_private *priv)
544 {
545         sysfs_remove_group(&priv->platform_device->dev.kobj,
546                            &ideapad_attribute_group);
547 }
548 
549 /*
550  * input device
551  */
552 static const struct key_entry ideapad_keymap[] = {
553         { KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
554         { KE_KEY, 7,  { KEY_CAMERA } },
555         { KE_KEY, 11, { KEY_F16 } },
556         { KE_KEY, 13, { KEY_WLAN } },
557         { KE_KEY, 16, { KEY_PROG1 } },
558         { KE_KEY, 17, { KEY_PROG2 } },
559         { KE_KEY, 64, { KEY_PROG3 } },
560         { KE_KEY, 65, { KEY_PROG4 } },
561         { KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
562         { KE_KEY, 67, { KEY_TOUCHPAD_ON } },
563         { KE_END, 0 },
564 };
565 
566 static int ideapad_input_init(struct ideapad_private *priv)
567 {
568         struct input_dev *inputdev;
569         int error;
570 
571         inputdev = input_allocate_device();
572         if (!inputdev)
573                 return -ENOMEM;
574 
575         inputdev->name = "Ideapad extra buttons";
576         inputdev->phys = "ideapad/input0";
577         inputdev->id.bustype = BUS_HOST;
578         inputdev->dev.parent = &priv->platform_device->dev;
579 
580         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
581         if (error) {
582                 pr_err("Unable to setup input device keymap\n");
583                 goto err_free_dev;
584         }
585 
586         error = input_register_device(inputdev);
587         if (error) {
588                 pr_err("Unable to register input device\n");
589                 goto err_free_keymap;
590         }
591 
592         priv->inputdev = inputdev;
593         return 0;
594 
595 err_free_keymap:
596         sparse_keymap_free(inputdev);
597 err_free_dev:
598         input_free_device(inputdev);
599         return error;
600 }
601 
602 static void ideapad_input_exit(struct ideapad_private *priv)
603 {
604         sparse_keymap_free(priv->inputdev);
605         input_unregister_device(priv->inputdev);
606         priv->inputdev = NULL;
607 }
608 
609 static void ideapad_input_report(struct ideapad_private *priv,
610                                  unsigned long scancode)
611 {
612         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
613 }
614 
615 static void ideapad_input_novokey(struct ideapad_private *priv)
616 {
617         unsigned long long_pressed;
618 
619         if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed))
620                 return;
621         if (long_pressed)
622                 ideapad_input_report(priv, 17);
623         else
624                 ideapad_input_report(priv, 16);
625 }
626 
627 static void ideapad_check_special_buttons(struct ideapad_private *priv)
628 {
629         unsigned long bit, value;
630 
631         read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
632 
633         for (bit = 0; bit < 16; bit++) {
634                 if (test_bit(bit, &value)) {
635                         switch (bit) {
636                         case 0: /* Z580 */
637                         case 6: /* Z570 */
638                                 /* Thermal Management button */
639                                 ideapad_input_report(priv, 65);
640                                 break;
641                         case 1:
642                                 /* OneKey Theater button */
643                                 ideapad_input_report(priv, 64);
644                                 break;
645                         default:
646                                 pr_info("Unknown special button: %lu\n", bit);
647                                 break;
648                         }
649                 }
650         }
651 }
652 
653 /*
654  * backlight
655  */
656 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
657 {
658         struct ideapad_private *priv = bl_get_data(blightdev);
659         unsigned long now;
660 
661         if (!priv)
662                 return -EINVAL;
663 
664         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
665                 return -EIO;
666         return now;
667 }
668 
669 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
670 {
671         struct ideapad_private *priv = bl_get_data(blightdev);
672 
673         if (!priv)
674                 return -EINVAL;
675 
676         if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL,
677                          blightdev->props.brightness))
678                 return -EIO;
679         if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER,
680                          blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
681                 return -EIO;
682 
683         return 0;
684 }
685 
686 static const struct backlight_ops ideapad_backlight_ops = {
687         .get_brightness = ideapad_backlight_get_brightness,
688         .update_status = ideapad_backlight_update_status,
689 };
690 
691 static int ideapad_backlight_init(struct ideapad_private *priv)
692 {
693         struct backlight_device *blightdev;
694         struct backlight_properties props;
695         unsigned long max, now, power;
696 
697         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max))
698                 return -EIO;
699         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
700                 return -EIO;
701         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
702                 return -EIO;
703 
704         memset(&props, 0, sizeof(struct backlight_properties));
705         props.max_brightness = max;
706         props.type = BACKLIGHT_PLATFORM;
707         blightdev = backlight_device_register("ideapad",
708                                               &priv->platform_device->dev,
709                                               priv,
710                                               &ideapad_backlight_ops,
711                                               &props);
712         if (IS_ERR(blightdev)) {
713                 pr_err("Could not register backlight device\n");
714                 return PTR_ERR(blightdev);
715         }
716 
717         priv->blightdev = blightdev;
718         blightdev->props.brightness = now;
719         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
720         backlight_update_status(blightdev);
721 
722         return 0;
723 }
724 
725 static void ideapad_backlight_exit(struct ideapad_private *priv)
726 {
727         if (priv->blightdev)
728                 backlight_device_unregister(priv->blightdev);
729         priv->blightdev = NULL;
730 }
731 
732 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
733 {
734         unsigned long power;
735         struct backlight_device *blightdev = priv->blightdev;
736 
737         if (!blightdev)
738                 return;
739         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
740                 return;
741         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
742 }
743 
744 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
745 {
746         unsigned long now;
747 
748         /* if we control brightness via acpi video driver */
749         if (priv->blightdev == NULL) {
750                 read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now);
751                 return;
752         }
753 
754         backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
755 }
756 
757 /*
758  * module init/exit
759  */
760 static void ideapad_sync_touchpad_state(struct ideapad_private *priv)
761 {
762         unsigned long value;
763 
764         /* Without reading from EC touchpad LED doesn't switch state */
765         if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) {
766                 /* Some IdeaPads don't really turn off touchpad - they only
767                  * switch the LED state. We (de)activate KBC AUX port to turn
768                  * touchpad off and on. We send KEY_TOUCHPAD_OFF and
769                  * KEY_TOUCHPAD_ON to not to get out of sync with LED */
770                 unsigned char param;
771                 i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
772                               I8042_CMD_AUX_DISABLE);
773                 ideapad_input_report(priv, value ? 67 : 66);
774         }
775 }
776 
777 static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
778 {
779         struct ideapad_private *priv = data;
780         unsigned long vpc1, vpc2, vpc_bit;
781 
782         if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
783                 return;
784         if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
785                 return;
786 
787         vpc1 = (vpc2 << 8) | vpc1;
788         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
789                 if (test_bit(vpc_bit, &vpc1)) {
790                         switch (vpc_bit) {
791                         case 9:
792                                 ideapad_sync_rfk_state(priv);
793                                 break;
794                         case 13:
795                         case 11:
796                         case 7:
797                         case 6:
798                                 ideapad_input_report(priv, vpc_bit);
799                                 break;
800                         case 5:
801                                 ideapad_sync_touchpad_state(priv);
802                                 break;
803                         case 4:
804                                 ideapad_backlight_notify_brightness(priv);
805                                 break;
806                         case 3:
807                                 ideapad_input_novokey(priv);
808                                 break;
809                         case 2:
810                                 ideapad_backlight_notify_power(priv);
811                                 break;
812                         case 0:
813                                 ideapad_check_special_buttons(priv);
814                                 break;
815                         default:
816                                 pr_info("Unknown event: %lu\n", vpc_bit);
817                         }
818                 }
819         }
820 }
821 
822 static int ideapad_acpi_add(struct platform_device *pdev)
823 {
824         int ret, i;
825         int cfg;
826         struct ideapad_private *priv;
827         struct acpi_device *adev;
828 
829         ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
830         if (ret)
831                 return -ENODEV;
832 
833         if (read_method_int(adev->handle, "_CFG", &cfg))
834                 return -ENODEV;
835 
836         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
837         if (!priv)
838                 return -ENOMEM;
839 
840         dev_set_drvdata(&pdev->dev, priv);
841         priv->cfg = cfg;
842         priv->adev = adev;
843         priv->platform_device = pdev;
844 
845         ret = ideapad_sysfs_init(priv);
846         if (ret)
847                 goto sysfs_failed;
848 
849         ret = ideapad_debugfs_init(priv);
850         if (ret)
851                 goto debugfs_failed;
852 
853         ret = ideapad_input_init(priv);
854         if (ret)
855                 goto input_failed;
856 
857         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
858                 if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
859                         ideapad_register_rfkill(priv, i);
860                 else
861                         priv->rfk[i] = NULL;
862         }
863         ideapad_sync_rfk_state(priv);
864         ideapad_sync_touchpad_state(priv);
865 
866         if (!acpi_video_backlight_support()) {
867                 ret = ideapad_backlight_init(priv);
868                 if (ret && ret != -ENODEV)
869                         goto backlight_failed;
870         }
871         ret = acpi_install_notify_handler(adev->handle,
872                 ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv);
873         if (ret)
874                 goto notification_failed;
875 
876         return 0;
877 notification_failed:
878         ideapad_backlight_exit(priv);
879 backlight_failed:
880         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
881                 ideapad_unregister_rfkill(priv, i);
882         ideapad_input_exit(priv);
883 input_failed:
884         ideapad_debugfs_exit(priv);
885 debugfs_failed:
886         ideapad_sysfs_exit(priv);
887 sysfs_failed:
888         kfree(priv);
889         return ret;
890 }
891 
892 static int ideapad_acpi_remove(struct platform_device *pdev)
893 {
894         struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
895         int i;
896 
897         acpi_remove_notify_handler(priv->adev->handle,
898                 ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
899         ideapad_backlight_exit(priv);
900         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
901                 ideapad_unregister_rfkill(priv, i);
902         ideapad_input_exit(priv);
903         ideapad_debugfs_exit(priv);
904         ideapad_sysfs_exit(priv);
905         dev_set_drvdata(&pdev->dev, NULL);
906         kfree(priv);
907 
908         return 0;
909 }
910 
911 #ifdef CONFIG_PM_SLEEP
912 static int ideapad_acpi_resume(struct device *device)
913 {
914         struct ideapad_private *priv;
915 
916         if (!device)
917                 return -EINVAL;
918         priv = dev_get_drvdata(device);
919 
920         ideapad_sync_rfk_state(priv);
921         ideapad_sync_touchpad_state(priv);
922         return 0;
923 }
924 #endif
925 static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
926 
927 static const struct acpi_device_id ideapad_device_ids[] = {
928         { "VPC2004", 0},
929         { "", 0},
930 };
931 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
932 
933 static struct platform_driver ideapad_acpi_driver = {
934         .probe = ideapad_acpi_add,
935         .remove = ideapad_acpi_remove,
936         .driver = {
937                 .name   = "ideapad_acpi",
938                 .owner  = THIS_MODULE,
939                 .pm     = &ideapad_pm,
940                 .acpi_match_table = ACPI_PTR(ideapad_device_ids),
941         },
942 };
943 
944 module_platform_driver(ideapad_acpi_driver);
945 
946 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
947 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
948 MODULE_LICENSE("GPL");
949 

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