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/leds.h>
  26
  27 #define APANEL_NAME     "Fujitsu Application Panel"
  28 #define APANEL          "apanel"
  29
  30 /* How often we poll keys - msecs */
  31 #define POLL_INTERVAL_DEFAULT   1000
  32
  33 /* Magic constants in BIOS that tell about buttons */
  34 enum apanel_devid {
  35         APANEL_DEV_NONE   = 0,
  36         APANEL_DEV_APPBTN = 1,
  37         APANEL_DEV_CDBTN  = 2,
  38         APANEL_DEV_LCD    = 3,
  39         APANEL_DEV_LED    = 4,
  40
  41         APANEL_DEV_MAX,
  42 };
  43
  44 enum apanel_chip {
  45         CHIP_NONE    = 0,
  46         CHIP_OZ992C  = 1,
  47         CHIP_OZ163T  = 2,
  48         CHIP_OZ711M3 = 4,
  49 };
  50
  51 /* Result of BIOS snooping/probing -- what features are supported */
  52 static enum apanel_chip device_chip[APANEL_DEV_MAX];
  53
  54 #define MAX_PANEL_KEYS  12
  55
  56 struct apanel {
  57         struct input_polled_dev *ipdev;
  58         struct i2c_client *client;
  59         unsigned short keymap[MAX_PANEL_KEYS];
  60         u16    nkeys;
  61         struct led_classdev mail_led;
  62 };
  63
  64
  65 static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);
  66
  67 static void report_key(struct input_dev *input, unsigned keycode)
  68 {
  69         pr_debug(APANEL ": report key %#x\n", keycode);
  70         input_report_key(input, keycode, 1);
  71         input_sync(input);
  72
  73         input_report_key(input, keycode, 0);
  74         input_sync(input);
  75 }
  76
  77 /* Poll for key changes
  78  *
  79  * Read Application keys via SMI
  80  *  A (0x4), B (0x8), Internet (0x2), Email (0x1).
  81  *
  82  * CD keys:
  83  * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
  84  */
  85 static void apanel_poll(struct input_polled_dev *ipdev)
  86 {
  87         struct apanel *ap = ipdev->private;
  88         struct input_dev *idev = ipdev->input;
  89         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
  90         s32 data;
  91         int i;
  92
  93         data = i2c_smbus_read_word_data(ap->client, cmd);
  94         if (data < 0)
  95                 return; /* ignore errors (due to ACPI??) */
  96
  97         /* write back to clear latch */
  98         i2c_smbus_write_word_data(ap->client, cmd, 0);
  99
 100         if (!data)
 101                 return;
 102
 103         dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
 104         for (i = 0; i < idev->keycodemax; i++)
 105                 if ((1u << i) & data)
 106                         report_key(idev, ap->keymap[i]);
 107 }
 108
 109 static int mail_led_set(struct led_classdev *led,
 110                          enum led_brightness value)
 111 {
 112         struct apanel *ap = container_of(led, struct apanel, mail_led);
 113         u16 led_bits = value != LED_OFF ? 0x8000 : 0x0000;
 114
 115         return i2c_smbus_write_word_data(ap->client, 0x10, led_bits);
 116 }
 117
 118 static int apanel_remove(struct i2c_client *client)
 119 {
 120         struct apanel *ap = i2c_get_clientdata(client);
 121
 122         if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
 123                 led_classdev_unregister(&ap->mail_led);
 124
 125         input_unregister_polled_device(ap->ipdev);
 126         input_free_polled_device(ap->ipdev);
 127
 128         return 0;
 129 }
 130
 131 static void apanel_shutdown(struct i2c_client *client)
 132 {
 133         apanel_remove(client);
 134 }
 135
 136 static const struct i2c_device_id apanel_id[] = {
 137         { "fujitsu_apanel", 0 },
 138         { }
 139 };
 140 MODULE_DEVICE_TABLE(i2c, apanel_id);
 141
 142 static struct i2c_driver apanel_driver = {
 143         .driver = {
 144                 .name = APANEL,
 145         },
 146         .probe          = &apanel_probe,
 147         .remove         = &apanel_remove,
 148         .shutdown       = &apanel_shutdown,
 149         .id_table       = apanel_id,
 150 };
 151
 152 static struct apanel apanel = {
 153         .keymap = {
 154                 [0] = KEY_MAIL,
 155                 [1] = KEY_WWW,
 156                 [2] = KEY_PROG2,
 157                 [3] = KEY_PROG1,
 158
 159                 [8] = KEY_FORWARD,
 160                 [9] = KEY_REWIND,
 161                 [10] = KEY_STOPCD,
 162                 [11] = KEY_PLAYPAUSE,
 163
 164         },
 165         .mail_led = {
 166                 .name = "mail:blue",
 167                 .brightness_set_blocking = mail_led_set,
 168         },
 169 };
 170
 171 /* NB: Only one panel on the i2c. */
 172 static int apanel_probe(struct i2c_client *client,
 173                         const struct i2c_device_id *id)
 174 {
 175         struct apanel *ap;
 176         struct input_polled_dev *ipdev;
 177         struct input_dev *idev;
 178         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
 179         int i, err = -ENOMEM;
 180
 181         ap = &apanel;
 182
 183         ipdev = input_allocate_polled_device();
 184         if (!ipdev)
 185                 goto out1;
 186
 187         ap->ipdev = ipdev;
 188         ap->client = client;
 189
 190         i2c_set_clientdata(client, ap);
 191
 192         err = i2c_smbus_write_word_data(client, cmd, 0);
 193         if (err) {
 194                 dev_warn(&client->dev, APANEL ": smbus write error %d\n",
 195                          err);
 196                 goto out3;
 197         }
 198
 199         ipdev->poll = apanel_poll;
 200         ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
 201         ipdev->private = ap;
 202
 203         idev = ipdev->input;
 204         idev->name = APANEL_NAME " buttons";
 205         idev->phys = "apanel/input0";
 206         idev->id.bustype = BUS_HOST;
 207         idev->dev.parent = &client->dev;
 208
 209         set_bit(EV_KEY, idev->evbit);
 210
 211         idev->keycode = ap->keymap;
 212         idev->keycodesize = sizeof(ap->keymap[0]);
 213         idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;
 214
 215         for (i = 0; i < idev->keycodemax; i++)
 216                 if (ap->keymap[i])
 217                         set_bit(ap->keymap[i], idev->keybit);
 218
 219         err = input_register_polled_device(ipdev);
 220         if (err)
 221                 goto out3;
 222
 223         if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
 224                 err = led_classdev_register(&client->dev, &ap->mail_led);
 225                 if (err)
 226                         goto out4;
 227         }
 228
 229         return 0;
 230 out4:
 231         input_unregister_polled_device(ipdev);
 232 out3:
 233         input_free_polled_device(ipdev);
 234 out1:
 235         return err;
 236 }
 237
 238 /* Scan the system ROM for the signature "FJKEYINF" */
 239 static __init const void __iomem *bios_signature(const void __iomem *bios)
 240 {
 241         ssize_t offset;
 242         const unsigned char signature[] = "FJKEYINF";
 243
 244         for (offset = 0; offset < 0x10000; offset += 0x10) {
 245                 if (check_signature(bios + offset, signature,
 246                                     sizeof(signature)-1))
 247                         return bios + offset;
 248         }
 249         pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
 250                   signature);
 251         return NULL;
 252 }
 253
 254 static int __init apanel_init(void)
 255 {
 256         void __iomem *bios;
 257         const void __iomem *p;
 258         u8 devno;
 259         unsigned char i2c_addr;
 260         int found = 0;
 261
 262         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
 263
 264         p = bios_signature(bios);
 265         if (!p) {
 266                 iounmap(bios);
 267                 return -ENODEV;
 268         }
 269
 270         /* just use the first address */
 271         p += 8;
 272         i2c_addr = readb(p + 3) >> 1;
 273
 274         for ( ; (devno = readb(p)) & 0x7f; p += 4) {
 275                 unsigned char method, slave, chip;
 276
 277                 method = readb(p + 1);
 278                 chip = readb(p + 2);
 279                 slave = readb(p + 3) >> 1;
 280
 281                 if (slave != i2c_addr) {
 282                         pr_notice(APANEL ": only one SMBus slave "
 283                                   "address supported, skipping device...\n");
 284                         continue;
 285                 }
 286
 287                 /* translate alternative device numbers */
 288                 switch (devno) {
 289                 case 6:
 290                         devno = APANEL_DEV_APPBTN;
 291                         break;
 292                 case 7:
 293                         devno = APANEL_DEV_LED;
 294                         break;
 295                 }
 296
 297                 if (devno >= APANEL_DEV_MAX)
 298                         pr_notice(APANEL ": unknown device %u found\n", devno);
 299                 else if (device_chip[devno] != CHIP_NONE)
 300                         pr_warn(APANEL ": duplicate entry for devno %u\n",
 301                                 devno);
 302
 303                 else if (method != 1 && method != 2 && method != 4) {
 304                         pr_notice(APANEL ": unknown method %u for devno %u\n",
 305                                   method, devno);
 306                 } else {
 307                         device_chip[devno] = (enum apanel_chip) chip;
 308                         ++found;
 309                 }
 310         }
 311         iounmap(bios);
 312
 313         if (found == 0) {
 314                 pr_info(APANEL ": no input devices reported by BIOS\n");
 315                 return -EIO;
 316         }
 317
 318         return i2c_add_driver(&apanel_driver);
 319 }
 320 module_init(apanel_init);
 321
 322 static void __exit apanel_cleanup(void)
 323 {
 324         i2c_del_driver(&apanel_driver);
 325 }
 326 module_exit(apanel_cleanup);
 327
 328 MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
 329 MODULE_DESCRIPTION(APANEL_NAME " driver");
 330 MODULE_LICENSE("GPL");
 331
 332 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
 333 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");