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          "apanel"
  30
  31 /* How often we poll keys - msecs */
  32 #define POLL_INTERVAL_DEFAULT   1000
  33
  34 /* Magic constants in BIOS that tell about buttons */
  35 enum apanel_devid {
  36         APANEL_DEV_NONE   = 0,
  37         APANEL_DEV_APPBTN = 1,
  38         APANEL_DEV_CDBTN  = 2,
  39         APANEL_DEV_LCD    = 3,
  40         APANEL_DEV_LED    = 4,
  41
  42         APANEL_DEV_MAX,
  43 };
  44
  45 enum apanel_chip {
  46         CHIP_NONE    = 0,
  47         CHIP_OZ992C  = 1,
  48         CHIP_OZ163T  = 2,
  49         CHIP_OZ711M3 = 4,
  50 };
  51
  52 /* Result of BIOS snooping/probing -- what features are supported */
  53 static enum apanel_chip device_chip[APANEL_DEV_MAX];
  54
  55 #define MAX_PANEL_KEYS  12
  56
  57 struct apanel {
  58         struct input_polled_dev *ipdev;
  59         struct i2c_client *client;
  60         unsigned short keymap[MAX_PANEL_KEYS];
  61         u16    nkeys;
  62         u16    led_bits;
  63         struct work_struct led_work;
  64         struct led_classdev mail_led;
  65 };
  66
  67
  68 static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);
  69
  70 static void report_key(struct input_dev *input, unsigned keycode)
  71 {
  72         pr_debug(APANEL ": report key %#x\n", keycode);
  73         input_report_key(input, keycode, 1);
  74         input_sync(input);
  75
  76         input_report_key(input, keycode, 0);
  77         input_sync(input);
  78 }
  79
  80 /* Poll for key changes
  81  *
  82  * Read Application keys via SMI
  83  *  A (0x4), B (0x8), Internet (0x2), Email (0x1).
  84  *
  85  * CD keys:
  86  * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
  87  */
  88 static void apanel_poll(struct input_polled_dev *ipdev)
  89 {
  90         struct apanel *ap = ipdev->private;
  91         struct input_dev *idev = ipdev->input;
  92         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
  93         s32 data;
  94         int i;
  95
  96         data = i2c_smbus_read_word_data(ap->client, cmd);
  97         if (data < 0)
  98                 return; /* ignore errors (due to ACPI??) */
  99
 100         /* write back to clear latch */
 101         i2c_smbus_write_word_data(ap->client, cmd, 0);
 102
 103         if (!data)
 104                 return;
 105
 106         dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
 107         for (i = 0; i < idev->keycodemax; i++)
 108                 if ((1u << i) & data)
 109                         report_key(idev, ap->keymap[i]);
 110 }
 111
 112 /* Track state changes of LED */
 113 static void led_update(struct work_struct *work)
 114 {
 115         struct apanel *ap = container_of(work, struct apanel, led_work);
 116
 117         i2c_smbus_write_word_data(ap->client, 0x10, ap->led_bits);
 118 }
 119
 120 static void mail_led_set(struct led_classdev *led,
 121                          enum led_brightness value)
 122 {
 123         struct apanel *ap = container_of(led, struct apanel, mail_led);
 124
 125         if (value != LED_OFF)
 126                 ap->led_bits |= 0x8000;
 127         else
 128                 ap->led_bits &= ~0x8000;
 129
 130         schedule_work(&ap->led_work);
 131 }
 132
 133 static int apanel_remove(struct i2c_client *client)
 134 {
 135         struct apanel *ap = i2c_get_clientdata(client);
 136
 137         if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
 138                 led_classdev_unregister(&ap->mail_led);
 139
 140         input_unregister_polled_device(ap->ipdev);
 141         input_free_polled_device(ap->ipdev);
 142
 143         return 0;
 144 }
 145
 146 static void apanel_shutdown(struct i2c_client *client)
 147 {
 148         apanel_remove(client);
 149 }
 150
 151 static const struct i2c_device_id apanel_id[] = {
 152         { "fujitsu_apanel", 0 },
 153         { }
 154 };
 155 MODULE_DEVICE_TABLE(i2c, apanel_id);
 156
 157 static struct i2c_driver apanel_driver = {
 158         .driver = {
 159                 .name = APANEL,
 160         },
 161         .probe          = &apanel_probe,
 162         .remove         = &apanel_remove,
 163         .shutdown       = &apanel_shutdown,
 164         .id_table       = apanel_id,
 165 };
 166
 167 static struct apanel apanel = {
 168         .keymap = {
 169                 [0] = KEY_MAIL,
 170                 [1] = KEY_WWW,
 171                 [2] = KEY_PROG2,
 172                 [3] = KEY_PROG1,
 173
 174                 [8] = KEY_FORWARD,
 175                 [9] = KEY_REWIND,
 176                 [10] = KEY_STOPCD,
 177                 [11] = KEY_PLAYPAUSE,
 178
 179         },
 180         .mail_led = {
 181                 .name = "mail:blue",
 182                 .brightness_set = mail_led_set,
 183         },
 184 };
 185
 186 /* NB: Only one panel on the i2c. */
 187 static int apanel_probe(struct i2c_client *client,
 188                         const struct i2c_device_id *id)
 189 {
 190         struct apanel *ap;
 191         struct input_polled_dev *ipdev;
 192         struct input_dev *idev;
 193         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
 194         int i, err = -ENOMEM;
 195
 196         ap = &apanel;
 197
 198         ipdev = input_allocate_polled_device();
 199         if (!ipdev)
 200                 goto out1;
 201
 202         ap->ipdev = ipdev;
 203         ap->client = client;
 204
 205         i2c_set_clientdata(client, ap);
 206
 207         err = i2c_smbus_write_word_data(client, cmd, 0);
 208         if (err) {
 209                 dev_warn(&client->dev, APANEL ": smbus write error %d\n",
 210                          err);
 211                 goto out3;
 212         }
 213
 214         ipdev->poll = apanel_poll;
 215         ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
 216         ipdev->private = ap;
 217
 218         idev = ipdev->input;
 219         idev->name = APANEL_NAME " buttons";
 220         idev->phys = "apanel/input0";
 221         idev->id.bustype = BUS_HOST;
 222         idev->dev.parent = &client->dev;
 223
 224         set_bit(EV_KEY, idev->evbit);
 225
 226         idev->keycode = ap->keymap;
 227         idev->keycodesize = sizeof(ap->keymap[0]);
 228         idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;
 229
 230         for (i = 0; i < idev->keycodemax; i++)
 231                 if (ap->keymap[i])
 232                         set_bit(ap->keymap[i], idev->keybit);
 233
 234         err = input_register_polled_device(ipdev);
 235         if (err)
 236                 goto out3;
 237
 238         INIT_WORK(&ap->led_work, led_update);
 239         if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
 240                 err = led_classdev_register(&client->dev, &ap->mail_led);
 241                 if (err)
 242                         goto out4;
 243         }
 244
 245         return 0;
 246 out4:
 247         input_unregister_polled_device(ipdev);
 248 out3:
 249         input_free_polled_device(ipdev);
 250 out1:
 251         return err;
 252 }
 253
 254 /* Scan the system ROM for the signature "FJKEYINF" */
 255 static __init const void __iomem *bios_signature(const void __iomem *bios)
 256 {
 257         ssize_t offset;
 258         const unsigned char signature[] = "FJKEYINF";
 259
 260         for (offset = 0; offset < 0x10000; offset += 0x10) {
 261                 if (check_signature(bios + offset, signature,
 262                                     sizeof(signature)-1))
 263                         return bios + offset;
 264         }
 265         pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
 266                   signature);
 267         return NULL;
 268 }
 269
 270 static int __init apanel_init(void)
 271 {
 272         void __iomem *bios;
 273         const void __iomem *p;
 274         u8 devno;
 275         unsigned char i2c_addr;
 276         int found = 0;
 277
 278         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
 279
 280         p = bios_signature(bios);
 281         if (!p) {
 282                 iounmap(bios);
 283                 return -ENODEV;
 284         }
 285
 286         /* just use the first address */
 287         p += 8;
 288         i2c_addr = readb(p + 3) >> 1;
 289
 290         for ( ; (devno = readb(p)) & 0x7f; p += 4) {
 291                 unsigned char method, slave, chip;
 292
 293                 method = readb(p + 1);
 294                 chip = readb(p + 2);
 295                 slave = readb(p + 3) >> 1;
 296
 297                 if (slave != i2c_addr) {
 298                         pr_notice(APANEL ": only one SMBus slave "
 299                                   "address supported, skipping device...\n");
 300                         continue;
 301                 }
 302
 303                 /* translate alternative device numbers */
 304                 switch (devno) {
 305                 case 6:
 306                         devno = APANEL_DEV_APPBTN;
 307                         break;
 308                 case 7:
 309                         devno = APANEL_DEV_LED;
 310                         break;
 311                 }
 312
 313                 if (devno >= APANEL_DEV_MAX)
 314                         pr_notice(APANEL ": unknown device %u found\n", devno);
 315                 else if (device_chip[devno] != CHIP_NONE)
 316                         pr_warn(APANEL ": duplicate entry for devno %u\n",
 317                                 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
 348 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
 349 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");