drivers/input/misc/apanel.c

   1 /*
   2  *  Fujitsu Lifebook Application Panel button drive
   3  *
   4  *  Copyright (C) 2007 Stephen Hemminger <shemminger@linux-foundation.org>
   5  *  Copyright (C) 2001-2003 Jochen Eisinger <jochen@penguin-breeder.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * Many Fujitsu Lifebook laptops have a small panel of buttons that are
  12  * accessible via the i2c/smbus interface. This driver polls those
  13  * buttons and generates input events.
  14  *
  15  * For more details see:
  16  *      http://apanel.sourceforge.net/tech.php
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/ioport.h>
  22 #include <linux/io.h>
  23 #include <linux/input-polldev.h>
  24 #include <linux/i2c.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/leds.h>
  27
  28 #define APANEL_NAME     "Fujitsu Application Panel"
  29 #define APANEL_VERSION  "1.3.1"
  30 #define APANEL          "apanel"
  31
  32 /* How often we poll keys - msecs */
  33 #define POLL_INTERVAL_DEFAULT   1000
  34
  35 /* Magic constants in BIOS that tell about buttons */
  36 enum apanel_devid {
  37         APANEL_DEV_NONE   = 0,
  38         APANEL_DEV_APPBTN = 1,
  39         APANEL_DEV_CDBTN  = 2,
  40         APANEL_DEV_LCD    = 3,
  41         APANEL_DEV_LED    = 4,
  42
  43         APANEL_DEV_MAX,
  44 };
  45
  46 enum apanel_chip {
  47         CHIP_NONE    = 0,
  48         CHIP_OZ992C  = 1,
  49         CHIP_OZ163T  = 2,
  50         CHIP_OZ711M3 = 4,
  51 };
  52
  53 /* Result of BIOS snooping/probing -- what features are supported */
  54 static enum apanel_chip device_chip[APANEL_DEV_MAX];
  55
  56 #define MAX_PANEL_KEYS  12
  57
  58 struct apanel {
  59         struct input_polled_dev *ipdev;
  60         struct i2c_client *client;
  61         unsigned short keymap[MAX_PANEL_KEYS];
  62         u16    nkeys;
  63         u16    led_bits;
  64         struct work_struct led_work;
  65         struct led_classdev mail_led;
  66 };
  67
  68
  69 static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);
  70
  71 static void report_key(struct input_dev *input, unsigned keycode)
  72 {
  73         pr_debug(APANEL ": report key %#x\n", keycode);
  74         input_report_key(input, keycode, 1);
  75         input_sync(input);
  76
  77         input_report_key(input, keycode, 0);
  78         input_sync(input);
  79 }
  80
  81 /* Poll for key changes
  82  *
  83  * Read Application keys via SMI
  84  *  A (0x4), B (0x8), Internet (0x2), Email (0x1).
  85  *
  86  * CD keys:
  87  * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
  88  */
  89 static void apanel_poll(struct input_polled_dev *ipdev)
  90 {
  91         struct apanel *ap = ipdev->private;
  92         struct input_dev *idev = ipdev->input;
  93         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
  94         s32 data;
  95         int i;
  96
  97         data = i2c_smbus_read_word_data(ap->client, cmd);
  98         if (data < 0)
  99                 return; /* ignore errors (due to ACPI??) */
 100
 101         /* write back to clear latch */
 102         i2c_smbus_write_word_data(ap->client, cmd, 0);
 103
 104         if (!data)
 105                 return;
 106
 107         dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
 108         for (i = 0; i < idev->keycodemax; i++)
 109                 if ((1u << i) & data)
 110                         report_key(idev, ap->keymap[i]);
 111 }
 112
 113 /* Track state changes of LED */
 114 static void led_update(struct work_struct *work)
 115 {
 116         struct apanel *ap = container_of(work, struct apanel, led_work);
 117
 118         i2c_smbus_write_word_data(ap->client, 0x10, ap->led_bits);
 119 }
 120
 121 static void mail_led_set(struct led_classdev *led,
 122                          enum led_brightness value)
 123 {
 124         struct apanel *ap = container_of(led, struct apanel, mail_led);
 125
 126         if (value != LED_OFF)
 127                 ap->led_bits |= 0x8000;
 128         else
 129                 ap->led_bits &= ~0x8000;
 130
 131         schedule_work(&ap->led_work);
 132 }
 133
 134 static int apanel_remove(struct i2c_client *client)
 135 {
 136         struct apanel *ap = i2c_get_clientdata(client);
 137
 138         if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
 139                 led_classdev_unregister(&ap->mail_led);
 140
 141         input_unregister_polled_device(ap->ipdev);
 142         input_free_polled_device(ap->ipdev);
 143
 144         return 0;
 145 }
 146
 147 static void apanel_shutdown(struct i2c_client *client)
 148 {
 149         apanel_remove(client);
 150 }
 151
 152 static const struct i2c_device_id apanel_id[] = {
 153         { "fujitsu_apanel", 0 },
 154         { }
 155 };
 156 MODULE_DEVICE_TABLE(i2c, apanel_id);
 157
 158 static struct i2c_driver apanel_driver = {
 159         .driver = {
 160                 .name = APANEL,
 161         },
 162         .probe          = &apanel_probe,
 163         .remove         = &apanel_remove,
 164         .shutdown       = &apanel_shutdown,
 165         .id_table       = apanel_id,
 166 };
 167
 168 static struct apanel apanel = {
 169         .keymap = {
 170                 [0] = KEY_MAIL,
 171                 [1] = KEY_WWW,
 172                 [2] = KEY_PROG2,
 173                 [3] = KEY_PROG1,
 174
 175                 [8] = KEY_FORWARD,
 176                 [9] = KEY_REWIND,
 177                 [10] = KEY_STOPCD,
 178                 [11] = KEY_PLAYPAUSE,
 179
 180         },
 181         .mail_led = {
 182                 .name = "mail:blue",
 183                 .brightness_set = mail_led_set,
 184         },
 185 };
 186
 187 /* NB: Only one panel on the i2c. */
 188 static int apanel_probe(struct i2c_client *client,
 189                         const struct i2c_device_id *id)
 190 {
 191         struct apanel *ap;
 192         struct input_polled_dev *ipdev;
 193         struct input_dev *idev;
 194         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
 195         int i, err = -ENOMEM;
 196
 197         ap = &apanel;
 198
 199         ipdev = input_allocate_polled_device();
 200         if (!ipdev)
 201                 goto out1;
 202
 203         ap->ipdev = ipdev;
 204         ap->client = client;
 205
 206         i2c_set_clientdata(client, ap);
 207
 208         err = i2c_smbus_write_word_data(client, cmd, 0);
 209         if (err) {
 210                 dev_warn(&client->dev, APANEL ": smbus write error %d\n",
 211                          err);
 212                 goto out3;
 213         }
 214
 215         ipdev->poll = apanel_poll;
 216         ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
 217         ipdev->private = ap;
 218
 219         idev = ipdev->input;
 220         idev->name = APANEL_NAME " buttons";
 221         idev->phys = "apanel/input0";
 222         idev->id.bustype = BUS_HOST;
 223         idev->dev.parent = &client->dev;
 224
 225         set_bit(EV_KEY, idev->evbit);
 226
 227         idev->keycode = ap->keymap;
 228         idev->keycodesize = sizeof(ap->keymap[0]);
 229         idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;
 230
 231         for (i = 0; i < idev->keycodemax; i++)
 232                 if (ap->keymap[i])
 233                         set_bit(ap->keymap[i], idev->keybit);
 234
 235         err = input_register_polled_device(ipdev);
 236         if (err)
 237                 goto out3;
 238
 239         INIT_WORK(&ap->led_work, led_update);
 240         if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
 241                 err = led_classdev_register(&client->dev, &ap->mail_led);
 242                 if (err)
 243                         goto out4;
 244         }
 245
 246         return 0;
 247 out4:
 248         input_unregister_polled_device(ipdev);
 249 out3:
 250         input_free_polled_device(ipdev);
 251 out1:
 252         return err;
 253 }
 254
 255 /* Scan the system ROM for the signature "FJKEYINF" */
 256 static __init const void __iomem *bios_signature(const void __iomem *bios)
 257 {
 258         ssize_t offset;
 259         const unsigned char signature[] = "FJKEYINF";
 260
 261         for (offset = 0; offset < 0x10000; offset += 0x10) {
 262                 if (check_signature(bios + offset, signature,
 263                                     sizeof(signature)-1))
 264                         return bios + offset;
 265         }
 266         pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
 267                   signature);
 268         return NULL;
 269 }
 270
 271 static int __init apanel_init(void)
 272 {
 273         void __iomem *bios;
 274         const void __iomem *p;
 275         u8 devno;
 276         unsigned char i2c_addr;
 277         int found = 0;
 278
 279         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
 280
 281         p = bios_signature(bios);
 282         if (!p) {
 283                 iounmap(bios);
 284                 return -ENODEV;
 285         }
 286
 287         /* just use the first address */
 288         p += 8;
 289         i2c_addr = readb(p + 3) >> 1;
 290
 291         for ( ; (devno = readb(p)) & 0x7f; p += 4) {
 292                 unsigned char method, slave, chip;
 293
 294                 method = readb(p + 1);
 295                 chip = readb(p + 2);
 296                 slave = readb(p + 3) >> 1;
 297
 298                 if (slave != i2c_addr) {
 299                         pr_notice(APANEL ": only one SMBus slave "
 300                                   "address supported, skiping device...\n");
 301                         continue;
 302                 }
 303
 304                 /* translate alternative device numbers */
 305                 switch (devno) {
 306                 case 6:
 307                         devno = APANEL_DEV_APPBTN;
 308                         break;
 309                 case 7:
 310                         devno = APANEL_DEV_LED;
 311                         break;
 312                 }
 313
 314                 if (devno >= APANEL_DEV_MAX)
 315                         pr_notice(APANEL ": unknown device %u found\n", devno);
 316                 else if (device_chip[devno] != CHIP_NONE)
 317                         pr_warning(APANEL ": duplicate entry for devno %u\n", devno);
 318
 319                 else if (method != 1 && method != 2 && method != 4) {
 320                         pr_notice(APANEL ": unknown method %u for devno %u\n",
 321                                   method, devno);
 322                 } else {
 323                         device_chip[devno] = (enum apanel_chip) chip;
 324                         ++found;
 325                 }
 326         }
 327         iounmap(bios);
 328
 329         if (found == 0) {
 330                 pr_info(APANEL ": no input devices reported by BIOS\n");
 331                 return -EIO;
 332         }
 333
 334         return i2c_add_driver(&apanel_driver);
 335 }
 336 module_init(apanel_init);
 337
 338 static void __exit apanel_cleanup(void)
 339 {
 340         i2c_del_driver(&apanel_driver);
 341 }
 342 module_exit(apanel_cleanup);
 343
 344 MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
 345 MODULE_DESCRIPTION(APANEL_NAME " driver");
 346 MODULE_LICENSE("GPL");
 347 MODULE_VERSION(APANEL_VERSION);
 348
 349 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
 350 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");