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/panasonic-laptop.c

  1 /*
  2  *  Panasonic HotKey and LCD brightness control driver
  3  *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
  4  *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
  5  *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
  6  *  (C) 2004 David Bronaugh <dbronaugh>
  7  *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
  8  *
  9  *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
 10  *
 11  *  This program is free software; you can redistribute it and/or modify
 12  *  it under the terms of the GNU General Public License version 2 as
 13  *  publicshed by the Free Software Foundation.
 14  *
 15  *  This program is distributed in the hope that it will be useful,
 16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  *  GNU General Public License for more details.
 19  *
 20  *  You should have received a copy of the GNU General Public License
 21  *  along with this program; if not, write to the Free Software
 22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 23  *
 24  *---------------------------------------------------------------------------
 25  *
 26  * ChangeLog:
 27  *      Sep.23, 2008    Harald Welte <laforge@gnumonks.org>
 28  *              -v0.95  rename driver from drivers/acpi/pcc_acpi.c to
 29  *                      drivers/misc/panasonic-laptop.c
 30  *
 31  *      Jul.04, 2008    Harald Welte <laforge@gnumonks.org>
 32  *              -v0.94  replace /proc interface with device attributes
 33  *                      support {set,get}keycode on th input device
 34  *
 35  *      Jun.27, 2008    Harald Welte <laforge@gnumonks.org>
 36  *              -v0.92  merge with 2.6.26-rc6 input API changes
 37  *                      remove broken <= 2.6.15 kernel support
 38  *                      resolve all compiler warnings
 39  *                      various coding style fixes (checkpatch.pl)
 40  *                      add support for backlight api
 41  *                      major code restructuring
 42  *
 43  *      Dac.28, 2007    Harald Welte <laforge@gnumonks.org>
 44  *              -v0.91  merge with 2.6.24-rc6 ACPI changes
 45  *
 46  *      Nov.04, 2006    Hiroshi Miura <miura@da-cha.org>
 47  *              -v0.9   remove warning about section reference.
 48  *                      remove acpi_os_free
 49  *                      add /proc/acpi/pcc/brightness interface for HAL access
 50  *                      merge dbronaugh's enhancement
 51  *                      Aug.17, 2004 David Bronaugh (dbronaugh)
 52  *                              - Added screen brightness setting interface
 53  *                                Thanks to FreeBSD crew (acpi_panasonic.c)
 54  *                                for the ideas I needed to accomplish it
 55  *
 56  *      May.29, 2006    Hiroshi Miura <miura@da-cha.org>
 57  *              -v0.8.4 follow to change keyinput structure
 58  *                      thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
 59  *                      Jacob Bower <jacob.bower@ic.ac.uk> and
 60  *                      Hiroshi Yokota for providing solutions.
 61  *
 62  *      Oct.02, 2004    Hiroshi Miura <miura@da-cha.org>
 63  *              -v0.8.2 merge code of YOKOTA Hiroshi
 64  *                                      <yokota@netlab.is.tsukuba.ac.jp>.
 65  *                      Add sticky key mode interface.
 66  *                      Refactoring acpi_pcc_generate_keyinput().
 67  *
 68  *      Sep.15, 2004    Hiroshi Miura <miura@da-cha.org>
 69  *              -v0.8   Generate key input event on input subsystem.
 70  *                      This is based on yet another driver written by
 71  *                                                      Ryuta Nakanishi.
 72  *
 73  *      Sep.10, 2004    Hiroshi Miura <miura@da-cha.org>
 74  *              -v0.7   Change proc interface functions using seq_file
 75  *                      facility as same as other ACPI drivers.
 76  *
 77  *      Aug.28, 2004    Hiroshi Miura <miura@da-cha.org>
 78  *              -v0.6.4 Fix a silly error with status checking
 79  *
 80  *      Aug.25, 2004    Hiroshi Miura <miura@da-cha.org>
 81  *              -v0.6.3 replace read_acpi_int by standard function
 82  *                                                      acpi_evaluate_integer
 83  *                      some clean up and make smart copyright notice.
 84  *                      fix return value of pcc_acpi_get_key()
 85  *                      fix checking return value of acpi_bus_register_driver()
 86  *
 87  *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 88  *              -v0.6.2 Add check on ACPI data (num_sifr)
 89  *                      Coding style cleanups, better error messages/handling
 90  *                      Fixed an off-by-one error in memory allocation
 91  *
 92  *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 93  *              -v0.6.1 Fix a silly error with status checking
 94  *
 95  *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 96  *              - v0.6  Correct brightness controls to reflect reality
 97  *                      based on information gleaned by Hiroshi Miura
 98  *                      and discussions with Hiroshi Miura
 99  *
100  *      Aug.10, 2004    Hiroshi Miura <miura@da-cha.org>
101  *              - v0.5  support LCD brightness control
102  *                      based on the disclosed information by MEI.
103  *
104  *      Jul.25, 2004    Hiroshi Miura <miura@da-cha.org>
105  *              - v0.4  first post version
106  *                      add function to retrive SIFR
107  *
108  *      Jul.24, 2004    Hiroshi Miura <miura@da-cha.org>
109  *              - v0.3  get proper status of hotkey
110  *
111  *      Jul.22, 2004    Hiroshi Miura <miura@da-cha.org>
112  *              - v0.2  add HotKey handler
113  *
114  *      Jul.17, 2004    Hiroshi Miura <miura@da-cha.org>
115  *              - v0.1  start from toshiba_acpi driver written by John Belmonte
116  *
117  */
118 
119 #include <linux/kernel.h>
120 #include <linux/module.h>
121 #include <linux/init.h>
122 #include <linux/types.h>
123 #include <linux/backlight.h>
124 #include <linux/ctype.h>
125 #include <linux/seq_file.h>
126 #include <linux/uaccess.h>
127 #include <linux/slab.h>
128 #include <linux/acpi.h>
129 #include <linux/input.h>
130 #include <linux/input/sparse-keymap.h>
131 
132 #ifndef ACPI_HOTKEY_COMPONENT
133 #define ACPI_HOTKEY_COMPONENT   0x10000000
134 #endif
135 
136 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
137 
138 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
139 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
140 MODULE_LICENSE("GPL");
141 
142 #define LOGPREFIX "pcc_acpi: "
143 
144 /* Define ACPI PATHs */
145 /* Lets note hotkeys */
146 #define METHOD_HKEY_QUERY       "HINF"
147 #define METHOD_HKEY_SQTY        "SQTY"
148 #define METHOD_HKEY_SINF        "SINF"
149 #define METHOD_HKEY_SSET        "SSET"
150 #define HKEY_NOTIFY              0x80
151 
152 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
153 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
154 #define ACPI_PCC_CLASS          "pcc"
155 
156 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
157 
158 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
159    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
160 */
161 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
162                  SINF_LCD_TYPE,
163                  SINF_AC_MAX_BRIGHT,
164                  SINF_AC_MIN_BRIGHT,
165                  SINF_AC_CUR_BRIGHT,
166                  SINF_DC_MAX_BRIGHT,
167                  SINF_DC_MIN_BRIGHT,
168                  SINF_DC_CUR_BRIGHT,
169                  SINF_MUTE,
170                  SINF_RESERVED,
171                  SINF_ENV_STATE,
172                  SINF_STICKY_KEY = 0x80,
173         };
174 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
175 
176 static int acpi_pcc_hotkey_add(struct acpi_device *device);
177 static int acpi_pcc_hotkey_remove(struct acpi_device *device);
178 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
179 
180 static const struct acpi_device_id pcc_device_ids[] = {
181         { "MAT0012", 0},
182         { "MAT0013", 0},
183         { "MAT0018", 0},
184         { "MAT0019", 0},
185         { "", 0},
186 };
187 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
188 
189 #ifdef CONFIG_PM_SLEEP
190 static int acpi_pcc_hotkey_resume(struct device *dev);
191 #endif
192 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
193 
194 static struct acpi_driver acpi_pcc_driver = {
195         .name =         ACPI_PCC_DRIVER_NAME,
196         .class =        ACPI_PCC_CLASS,
197         .ids =          pcc_device_ids,
198         .ops =          {
199                                 .add =          acpi_pcc_hotkey_add,
200                                 .remove =       acpi_pcc_hotkey_remove,
201                                 .notify =       acpi_pcc_hotkey_notify,
202                         },
203         .drv.pm =       &acpi_pcc_hotkey_pm,
204 };
205 
206 static const struct key_entry panasonic_keymap[] = {
207         { KE_KEY, 0, { KEY_RESERVED } },
208         { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
209         { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
210         { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
211         { KE_KEY, 4, { KEY_MUTE } },
212         { KE_KEY, 5, { KEY_VOLUMEDOWN } },
213         { KE_KEY, 6, { KEY_VOLUMEUP } },
214         { KE_KEY, 7, { KEY_SLEEP } },
215         { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
216         { KE_KEY, 9, { KEY_BATTERY } },
217         { KE_KEY, 10, { KEY_SUSPEND } },
218         { KE_END, 0 }
219 };
220 
221 struct pcc_acpi {
222         acpi_handle             handle;
223         unsigned long           num_sifr;
224         int                     sticky_mode;
225         u32                     *sinf;
226         struct acpi_device      *device;
227         struct input_dev        *input_dev;
228         struct backlight_device *backlight;
229 };
230 
231 struct pcc_keyinput {
232         struct acpi_hotkey      *hotkey;
233 };
234 
235 /* method access functions */
236 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
237 {
238         union acpi_object in_objs[] = {
239                 { .integer.type  = ACPI_TYPE_INTEGER,
240                   .integer.value = func, },
241                 { .integer.type  = ACPI_TYPE_INTEGER,
242                   .integer.value = val, },
243         };
244         struct acpi_object_list params = {
245                 .count   = ARRAY_SIZE(in_objs),
246                 .pointer = in_objs,
247         };
248         acpi_status status = AE_OK;
249 
250         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
251                                       &params, NULL);
252 
253         return (status == AE_OK) ? 0 : -EIO;
254 }
255 
256 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
257 {
258         unsigned long long s;
259         acpi_status status;
260 
261         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
262                                        NULL, &s);
263         if (ACPI_SUCCESS(status))
264                 return s;
265         else {
266                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
267                                   "evaluation error HKEY.SQTY\n"));
268                 return -EINVAL;
269         }
270 }
271 
272 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
273 {
274         acpi_status status;
275         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
276         union acpi_object *hkey = NULL;
277         int i;
278 
279         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
280                                       &buffer);
281         if (ACPI_FAILURE(status)) {
282                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
283                                   "evaluation error HKEY.SINF\n"));
284                 return 0;
285         }
286 
287         hkey = buffer.pointer;
288         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
289                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
290                 status = AE_ERROR;
291                 goto end;
292         }
293 
294         if (pcc->num_sifr < hkey->package.count) {
295                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
296                                  "SQTY reports bad SINF length\n"));
297                 status = AE_ERROR;
298                 goto end;
299         }
300 
301         for (i = 0; i < hkey->package.count; i++) {
302                 union acpi_object *element = &(hkey->package.elements[i]);
303                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
304                         pcc->sinf[i] = element->integer.value;
305                 } else
306                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
307                                          "Invalid HKEY.SINF data\n"));
308         }
309         pcc->sinf[hkey->package.count] = -1;
310 
311 end:
312         kfree(buffer.pointer);
313         return status == AE_OK;
314 }
315 
316 /* backlight API interface functions */
317 
318 /* This driver currently treats AC and DC brightness identical,
319  * since we don't need to invent an interface to the core ACPI
320  * logic to receive events in case a power supply is plugged in
321  * or removed */
322 
323 static int bl_get(struct backlight_device *bd)
324 {
325         struct pcc_acpi *pcc = bl_get_data(bd);
326 
327         if (!acpi_pcc_retrieve_biosdata(pcc))
328                 return -EIO;
329 
330         return pcc->sinf[SINF_AC_CUR_BRIGHT];
331 }
332 
333 static int bl_set_status(struct backlight_device *bd)
334 {
335         struct pcc_acpi *pcc = bl_get_data(bd);
336         int bright = bd->props.brightness;
337         int rc;
338 
339         if (!acpi_pcc_retrieve_biosdata(pcc))
340                 return -EIO;
341 
342         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
343                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
344 
345         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
346                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
347 
348         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
349             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
350                 return -EINVAL;
351 
352         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
353         if (rc < 0)
354                 return rc;
355 
356         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
357 }
358 
359 static const struct backlight_ops pcc_backlight_ops = {
360         .get_brightness = bl_get,
361         .update_status  = bl_set_status,
362 };
363 
364 
365 /* sysfs user interface functions */
366 
367 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
368                             char *buf)
369 {
370         struct acpi_device *acpi = to_acpi_device(dev);
371         struct pcc_acpi *pcc = acpi_driver_data(acpi);
372 
373         if (!acpi_pcc_retrieve_biosdata(pcc))
374                 return -EIO;
375 
376         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
377 }
378 
379 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
380                             char *buf)
381 {
382         struct acpi_device *acpi = to_acpi_device(dev);
383         struct pcc_acpi *pcc = acpi_driver_data(acpi);
384 
385         if (!acpi_pcc_retrieve_biosdata(pcc))
386                 return -EIO;
387 
388         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
389 }
390 
391 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
392                          char *buf)
393 {
394         struct acpi_device *acpi = to_acpi_device(dev);
395         struct pcc_acpi *pcc = acpi_driver_data(acpi);
396 
397         if (!acpi_pcc_retrieve_biosdata(pcc))
398                 return -EIO;
399 
400         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
401 }
402 
403 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
404                            char *buf)
405 {
406         struct acpi_device *acpi = to_acpi_device(dev);
407         struct pcc_acpi *pcc = acpi_driver_data(acpi);
408 
409         if (!acpi_pcc_retrieve_biosdata(pcc))
410                 return -EIO;
411 
412         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
413 }
414 
415 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
416                           const char *buf, size_t count)
417 {
418         struct acpi_device *acpi = to_acpi_device(dev);
419         struct pcc_acpi *pcc = acpi_driver_data(acpi);
420         int val;
421 
422         if (count && sscanf(buf, "%i", &val) == 1 &&
423             (val == 0 || val == 1)) {
424                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
425                 pcc->sticky_mode = val;
426         }
427 
428         return count;
429 }
430 
431 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
432 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
433 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
434 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
435 
436 static struct attribute *pcc_sysfs_entries[] = {
437         &dev_attr_numbatt.attr,
438         &dev_attr_lcdtype.attr,
439         &dev_attr_mute.attr,
440         &dev_attr_sticky_key.attr,
441         NULL,
442 };
443 
444 static struct attribute_group pcc_attr_group = {
445         .name   = NULL,         /* put in device directory */
446         .attrs  = pcc_sysfs_entries,
447 };
448 
449 
450 /* hotkey input device driver */
451 
452 static int sleep_keydown_seen;
453 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
454 {
455         struct input_dev *hotk_input_dev = pcc->input_dev;
456         int rc;
457         unsigned long long result;
458 
459         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
460                                    NULL, &result);
461         if (!ACPI_SUCCESS(rc)) {
462                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
463                                  "error getting hotkey status\n"));
464                 return;
465         }
466 
467         /* hack: some firmware sends no key down for sleep / hibernate */
468         if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
469                 if (result & 0x80)
470                         sleep_keydown_seen = 1;
471                 if (!sleep_keydown_seen)
472                         sparse_keymap_report_event(hotk_input_dev,
473                                         result & 0xf, 0x80, false);
474         }
475 
476         if (!sparse_keymap_report_event(hotk_input_dev,
477                                         result & 0xf, result & 0x80, false))
478                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
479                                   "Unknown hotkey event: %d\n", result));
480 }
481 
482 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
483 {
484         struct pcc_acpi *pcc = acpi_driver_data(device);
485 
486         switch (event) {
487         case HKEY_NOTIFY:
488                 acpi_pcc_generate_keyinput(pcc);
489                 break;
490         default:
491                 /* nothing to do */
492                 break;
493         }
494 }
495 
496 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
497 {
498         struct input_dev *input_dev;
499         int error;
500 
501         input_dev = input_allocate_device();
502         if (!input_dev)
503                 return -ENOMEM;
504 
505         input_dev->name = ACPI_PCC_DRIVER_NAME;
506         input_dev->phys = ACPI_PCC_INPUT_PHYS;
507         input_dev->id.bustype = BUS_HOST;
508         input_dev->id.vendor = 0x0001;
509         input_dev->id.product = 0x0001;
510         input_dev->id.version = 0x0100;
511 
512         error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
513         if (error) {
514                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
515                                   "Unable to setup input device keymap\n"));
516                 goto err_free_dev;
517         }
518 
519         error = input_register_device(input_dev);
520         if (error) {
521                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
522                                   "Unable to register input device\n"));
523                 goto err_free_keymap;
524         }
525 
526         pcc->input_dev = input_dev;
527         return 0;
528 
529  err_free_keymap:
530         sparse_keymap_free(input_dev);
531  err_free_dev:
532         input_free_device(input_dev);
533         return error;
534 }
535 
536 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
537 {
538         sparse_keymap_free(pcc->input_dev);
539         input_unregister_device(pcc->input_dev);
540         /*
541          * No need to input_free_device() since core input API refcounts
542          * and free()s the device.
543          */
544 }
545 
546 /* kernel module interface */
547 
548 #ifdef CONFIG_PM_SLEEP
549 static int acpi_pcc_hotkey_resume(struct device *dev)
550 {
551         struct pcc_acpi *pcc;
552 
553         if (!dev)
554                 return -EINVAL;
555 
556         pcc = acpi_driver_data(to_acpi_device(dev));
557         if (!pcc)
558                 return -EINVAL;
559 
560         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
561                           pcc->sticky_mode));
562 
563         return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
564 }
565 #endif
566 
567 static int acpi_pcc_hotkey_add(struct acpi_device *device)
568 {
569         struct backlight_properties props;
570         struct pcc_acpi *pcc;
571         int num_sifr, result;
572 
573         if (!device)
574                 return -EINVAL;
575 
576         num_sifr = acpi_pcc_get_sqty(device);
577 
578         if (num_sifr < 0 || num_sifr > 255) {
579                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
580                 return -ENODEV;
581         }
582 
583         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
584         if (!pcc) {
585                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
586                                   "Couldn't allocate mem for pcc"));
587                 return -ENOMEM;
588         }
589 
590         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
591         if (!pcc->sinf) {
592                 result = -ENOMEM;
593                 goto out_hotkey;
594         }
595 
596         pcc->device = device;
597         pcc->handle = device->handle;
598         pcc->num_sifr = num_sifr;
599         device->driver_data = pcc;
600         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
601         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
602 
603         result = acpi_pcc_init_input(pcc);
604         if (result) {
605                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
606                                   "Error installing keyinput handler\n"));
607                 goto out_sinf;
608         }
609 
610         if (!acpi_pcc_retrieve_biosdata(pcc)) {
611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
612                                  "Couldn't retrieve BIOS data\n"));
613                 result = -EIO;
614                 goto out_input;
615         }
616         /* initialize backlight */
617         memset(&props, 0, sizeof(struct backlight_properties));
618         props.type = BACKLIGHT_PLATFORM;
619         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
620         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
621                                                    &pcc_backlight_ops, &props);
622         if (IS_ERR(pcc->backlight)) {
623                 result = PTR_ERR(pcc->backlight);
624                 goto out_input;
625         }
626 
627         /* read the initial brightness setting from the hardware */
628         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
629 
630         /* read the initial sticky key mode from the hardware */
631         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
632 
633         /* add sysfs attributes */
634         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
635         if (result)
636                 goto out_backlight;
637 
638         return 0;
639 
640 out_backlight:
641         backlight_device_unregister(pcc->backlight);
642 out_input:
643         acpi_pcc_destroy_input(pcc);
644 out_sinf:
645         kfree(pcc->sinf);
646 out_hotkey:
647         kfree(pcc);
648 
649         return result;
650 }
651 
652 static int acpi_pcc_hotkey_remove(struct acpi_device *device)
653 {
654         struct pcc_acpi *pcc = acpi_driver_data(device);
655 
656         if (!device || !pcc)
657                 return -EINVAL;
658 
659         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
660 
661         backlight_device_unregister(pcc->backlight);
662 
663         acpi_pcc_destroy_input(pcc);
664 
665         kfree(pcc->sinf);
666         kfree(pcc);
667 
668         return 0;
669 }
670 
671 module_acpi_driver(acpi_pcc_driver);
672 

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