drivers/hid/hid-appleir.c

   1 /*
   2  * HID driver for the apple ir device
   3  *
   4  * Original driver written by James McKenzie
   5  * Ported to recent 2.6 kernel versions by Greg Kroah-Hartman <gregkh@suse.de>
   6  * Updated to support newer remotes by Bastien Nocera <hadess@hadess.net>
   7  * Ported to HID subsystem by Benjamin Tissoires <benjamin.tissoires@gmail.com>
   8  *
   9  * Copyright (C) 2006 James McKenzie
  10  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
  11  * Copyright (C) 2008 Novell Inc.
  12  * Copyright (C) 2010, 2012 Bastien Nocera <hadess@hadess.net>
  13  * Copyright (C) 2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  14  * Copyright (C) 2013 Red Hat Inc. All Rights Reserved
  15  *
  16  * This software is licensed under the terms of the GNU General Public
  17  * License version 2, as published by the Free Software Foundation, and
  18  * may be copied, distributed, and modified under those terms.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  */
  25
  26 #include <linux/device.h>
  27 #include <linux/hid.h>
  28 #include <linux/module.h>
  29 #include "hid-ids.h"
  30
  31 MODULE_AUTHOR("James McKenzie");
  32 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
  33 MODULE_DESCRIPTION("HID Apple IR remote controls");
  34 MODULE_LICENSE("GPL");
  35
  36 #define KEY_MASK                0x0F
  37 #define TWO_PACKETS_MASK        0x40
  38
  39 /*
  40  * James McKenzie has two devices both of which report the following
  41  * 25 87 ee 83 0a       +
  42  * 25 87 ee 83 0c       -
  43  * 25 87 ee 83 09       <<
  44  * 25 87 ee 83 06       >>
  45  * 25 87 ee 83 05       >"
  46  * 25 87 ee 83 03       menu
  47  * 26 00 00 00 00       for key repeat
  48  */
  49
  50 /*
  51  * Thomas Glanzmann reports the following responses
  52  * 25 87 ee ca 0b       +
  53  * 25 87 ee ca 0d       -
  54  * 25 87 ee ca 08       <<
  55  * 25 87 ee ca 07       >>
  56  * 25 87 ee ca 04       >"
  57  * 25 87 ee ca 02       menu
  58  * 26 00 00 00 00       for key repeat
  59  *
  60  * He also observes the following event sometimes
  61  * sent after a key is release, which I interpret
  62  * as a flat battery message
  63  * 25 87 e0 ca 06       flat battery
  64  */
  65
  66 /*
  67  * Alexandre Karpenko reports the following responses for Device ID 0x8242
  68  * 25 87 ee 47 0b       +
  69  * 25 87 ee 47 0d       -
  70  * 25 87 ee 47 08       <<
  71  * 25 87 ee 47 07       >>
  72  * 25 87 ee 47 04       >"
  73  * 25 87 ee 47 02       menu
  74  * 26 87 ee 47 **       for key repeat (** is the code of the key being held)
  75  */
  76
  77 /*
  78  * Bastien Nocera's remote
  79  * 25 87 ee 91 5f       followed by
  80  * 25 87 ee 91 05       gives you >"
  81  *
  82  * 25 87 ee 91 5c       followed by
  83  * 25 87 ee 91 05       gives you the middle button
  84  */
  85
  86 /*
  87  * Fabien Andre's remote
  88  * 25 87 ee a3 5e       followed by
  89  * 25 87 ee a3 04       gives you >"
  90  *
  91  * 25 87 ee a3 5d       followed by
  92  * 25 87 ee a3 04       gives you the middle button
  93  */
  94
  95 static const unsigned short appleir_key_table[] = {
  96         KEY_RESERVED,
  97         KEY_MENU,
  98         KEY_PLAYPAUSE,
  99         KEY_FORWARD,
 100         KEY_BACK,
 101         KEY_VOLUMEUP,
 102         KEY_VOLUMEDOWN,
 103         KEY_RESERVED,
 104         KEY_RESERVED,
 105         KEY_RESERVED,
 106         KEY_RESERVED,
 107         KEY_RESERVED,
 108         KEY_RESERVED,
 109         KEY_RESERVED,
 110         KEY_ENTER,
 111         KEY_PLAYPAUSE,
 112         KEY_RESERVED,
 113 };
 114
 115 struct appleir {
 116         struct input_dev *input_dev;
 117         struct hid_device *hid;
 118         unsigned short keymap[ARRAY_SIZE(appleir_key_table)];
 119         struct timer_list key_up_timer; /* timer for key up */
 120         spinlock_t lock;                /* protects .current_key */
 121         int current_key;                /* the currently pressed key */
 122         int prev_key_idx;               /* key index in a 2 packets message */
 123 };
 124
 125 static int get_key(int data)
 126 {
 127         /*
 128          * The key is coded accross bits 2..9:
 129          *
 130          * 0x00 or 0x01 (        )      key:  0         -> KEY_RESERVED
 131          * 0x02 or 0x03 (  menu  )      key:  1         -> KEY_MENU
 132          * 0x04 or 0x05 (   >"   )      key:  2         -> KEY_PLAYPAUSE
 133          * 0x06 or 0x07 (   >>   )      key:  3         -> KEY_FORWARD
 134          * 0x08 or 0x09 (   <<   )      key:  4         -> KEY_BACK
 135          * 0x0a or 0x0b (    +   )      key:  5         -> KEY_VOLUMEUP
 136          * 0x0c or 0x0d (    -   )      key:  6         -> KEY_VOLUMEDOWN
 137          * 0x0e or 0x0f (        )      key:  7         -> KEY_RESERVED
 138          * 0x50 or 0x51 (        )      key:  8         -> KEY_RESERVED
 139          * 0x52 or 0x53 (        )      key:  9         -> KEY_RESERVED
 140          * 0x54 or 0x55 (        )      key: 10         -> KEY_RESERVED
 141          * 0x56 or 0x57 (        )      key: 11         -> KEY_RESERVED
 142          * 0x58 or 0x59 (        )      key: 12         -> KEY_RESERVED
 143          * 0x5a or 0x5b (        )      key: 13         -> KEY_RESERVED
 144          * 0x5c or 0x5d ( middle )      key: 14         -> KEY_ENTER
 145          * 0x5e or 0x5f (   >"   )      key: 15         -> KEY_PLAYPAUSE
 146          *
 147          * Packets starting with 0x5 are part of a two-packets message,
 148          * we notify the caller by sending a negative value.
 149          */
 150         int key = (data >> 1) & KEY_MASK;
 151
 152         if ((data & TWO_PACKETS_MASK))
 153                 /* Part of a 2 packets-command */
 154                 key = -key;
 155
 156         return key;
 157 }
 158
 159 static void key_up(struct hid_device *hid, struct appleir *appleir, int key)
 160 {
 161         input_report_key(appleir->input_dev, key, 0);
 162         input_sync(appleir->input_dev);
 163 }
 164
 165 static void key_down(struct hid_device *hid, struct appleir *appleir, int key)
 166 {
 167         input_report_key(appleir->input_dev, key, 1);
 168         input_sync(appleir->input_dev);
 169 }
 170
 171 static void battery_flat(struct appleir *appleir)
 172 {
 173         dev_err(&appleir->input_dev->dev, "possible flat battery?\n");
 174 }
 175
 176 static void key_up_tick(struct timer_list *t)
 177 {
 178         struct appleir *appleir = from_timer(appleir, t, key_up_timer);
 179         struct hid_device *hid = appleir->hid;
 180         unsigned long flags;
 181
 182         spin_lock_irqsave(&appleir->lock, flags);
 183         if (appleir->current_key) {
 184                 key_up(hid, appleir, appleir->current_key);
 185                 appleir->current_key = 0;
 186         }
 187         spin_unlock_irqrestore(&appleir->lock, flags);
 188 }
 189
 190 static int appleir_raw_event(struct hid_device *hid, struct hid_report *report,
 191          u8 *data, int len)
 192 {
 193         struct appleir *appleir = hid_get_drvdata(hid);
 194         static const u8 keydown[] = { 0x25, 0x87, 0xee };
 195         static const u8 keyrepeat[] = { 0x26, };
 196         static const u8 flatbattery[] = { 0x25, 0x87, 0xe0 };
 197         unsigned long flags;
 198
 199         if (len != 5)
 200                 goto out;
 201
 202         if (!memcmp(data, keydown, sizeof(keydown))) {
 203                 int index;
 204
 205                 spin_lock_irqsave(&appleir->lock, flags);
 206                 /*
 207                  * If we already have a key down, take it up before marking
 208                  * this one down
 209                  */
 210                 if (appleir->current_key)
 211                         key_up(hid, appleir, appleir->current_key);
 212
 213                 /* Handle dual packet commands */
 214                 if (appleir->prev_key_idx > 0)
 215                         index = appleir->prev_key_idx;
 216                 else
 217                         index = get_key(data[4]);
 218
 219                 if (index >= 0) {
 220                         appleir->current_key = appleir->keymap[index];
 221
 222                         key_down(hid, appleir, appleir->current_key);
 223                         /*
 224                          * Remote doesn't do key up, either pull them up, in
 225                          * the test above, or here set a timer which pulls
 226                          * them up after 1/8 s
 227                          */
 228                         mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
 229                         appleir->prev_key_idx = 0;
 230                 } else
 231                         /* Remember key for next packet */
 232                         appleir->prev_key_idx = -index;
 233                 spin_unlock_irqrestore(&appleir->lock, flags);
 234                 goto out;
 235         }
 236
 237         appleir->prev_key_idx = 0;
 238
 239         if (!memcmp(data, keyrepeat, sizeof(keyrepeat))) {
 240                 key_down(hid, appleir, appleir->current_key);
 241                 /*
 242                  * Remote doesn't do key up, either pull them up, in the test
 243                  * above, or here set a timer which pulls them up after 1/8 s
 244                  */
 245                 mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
 246                 goto out;
 247         }
 248
 249         if (!memcmp(data, flatbattery, sizeof(flatbattery))) {
 250                 battery_flat(appleir);
 251                 /* Fall through */
 252         }
 253
 254 out:
 255         /* let hidraw and hiddev handle the report */
 256         return 0;
 257 }
 258
 259 static int appleir_input_configured(struct hid_device *hid,
 260                 struct hid_input *hidinput)
 261 {
 262         struct input_dev *input_dev = hidinput->input;
 263         struct appleir *appleir = hid_get_drvdata(hid);
 264         int i;
 265
 266         appleir->input_dev = input_dev;
 267
 268         input_dev->keycode = appleir->keymap;
 269         input_dev->keycodesize = sizeof(unsigned short);
 270         input_dev->keycodemax = ARRAY_SIZE(appleir->keymap);
 271
 272         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 273
 274         memcpy(appleir->keymap, appleir_key_table, sizeof(appleir->keymap));
 275         for (i = 0; i < ARRAY_SIZE(appleir_key_table); i++)
 276                 set_bit(appleir->keymap[i], input_dev->keybit);
 277         clear_bit(KEY_RESERVED, input_dev->keybit);
 278
 279         return 0;
 280 }
 281
 282 static int appleir_input_mapping(struct hid_device *hid,
 283                 struct hid_input *hi, struct hid_field *field,
 284                 struct hid_usage *usage, unsigned long **bit, int *max)
 285 {
 286         return -1;
 287 }
 288
 289 static int appleir_probe(struct hid_device *hid, const struct hid_device_id *id)
 290 {
 291         int ret;
 292         struct appleir *appleir;
 293
 294         appleir = kzalloc(sizeof(struct appleir), GFP_KERNEL);
 295         if (!appleir) {
 296                 ret = -ENOMEM;
 297                 goto allocfail;
 298         }
 299
 300         appleir->hid = hid;
 301
 302         /* force input as some remotes bypass the input registration */
 303         hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
 304
 305         spin_lock_init(&appleir->lock);
 306         timer_setup(&appleir->key_up_timer, key_up_tick, 0);
 307
 308         hid_set_drvdata(hid, appleir);
 309
 310         ret = hid_parse(hid);
 311         if (ret) {
 312                 hid_err(hid, "parse failed\n");
 313                 goto fail;
 314         }
 315
 316         ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
 317         if (ret) {
 318                 hid_err(hid, "hw start failed\n");
 319                 goto fail;
 320         }
 321
 322         return 0;
 323 fail:
 324         kfree(appleir);
 325 allocfail:
 326         return ret;
 327 }
 328
 329 static void appleir_remove(struct hid_device *hid)
 330 {
 331         struct appleir *appleir = hid_get_drvdata(hid);
 332         hid_hw_stop(hid);
 333         del_timer_sync(&appleir->key_up_timer);
 334         kfree(appleir);
 335 }
 336
 337 static const struct hid_device_id appleir_devices[] = {
 338         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL) },
 339         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL2) },
 340         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL3) },
 341         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL4) },
 342         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL5) },
 343         { }
 344 };
 345 MODULE_DEVICE_TABLE(hid, appleir_devices);
 346
 347 static struct hid_driver appleir_driver = {
 348         .name = "appleir",
 349         .id_table = appleir_devices,
 350         .raw_event = appleir_raw_event,
 351         .input_configured = appleir_input_configured,
 352         .probe = appleir_probe,
 353         .remove = appleir_remove,
 354         .input_mapping = appleir_input_mapping,
 355 };
 356 module_hid_driver(appleir_driver);