root/drivers/input/misc/apanel.c

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DEFINITIONS

This source file includes following definitions.
  1. report_key
  2. apanel_poll
  3. mail_led_set
  4. apanel_remove
  5. apanel_shutdown
  6. apanel_probe
  7. bios_signature
  8. apanel_init
  9. apanel_cleanup

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Fujitsu Lifebook Application Panel button drive
   4  *
   5  *  Copyright (C) 2007 Stephen Hemminger <shemminger@linux-foundation.org>
   6  *  Copyright (C) 2001-2003 Jochen Eisinger <jochen@penguin-breeder.org>
   7  *
   8  * Many Fujitsu Lifebook laptops have a small panel of buttons that are
   9  * accessible via the i2c/smbus interface. This driver polls those
  10  * buttons and generates input events.
  11  *
  12  * For more details see:
  13  *      http://apanel.sourceforge.net/tech.php
  14  */
  15 
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/ioport.h>
  19 #include <linux/io.h>
  20 #include <linux/input-polldev.h>
  21 #include <linux/i2c.h>
  22 #include <linux/leds.h>
  23 
  24 #define APANEL_NAME     "Fujitsu Application Panel"
  25 #define APANEL          "apanel"
  26 
  27 /* How often we poll keys - msecs */
  28 #define POLL_INTERVAL_DEFAULT   1000
  29 
  30 /* Magic constants in BIOS that tell about buttons */
  31 enum apanel_devid {
  32         APANEL_DEV_NONE   = 0,
  33         APANEL_DEV_APPBTN = 1,
  34         APANEL_DEV_CDBTN  = 2,
  35         APANEL_DEV_LCD    = 3,
  36         APANEL_DEV_LED    = 4,
  37 
  38         APANEL_DEV_MAX,
  39 };
  40 
  41 enum apanel_chip {
  42         CHIP_NONE    = 0,
  43         CHIP_OZ992C  = 1,
  44         CHIP_OZ163T  = 2,
  45         CHIP_OZ711M3 = 4,
  46 };
  47 
  48 /* Result of BIOS snooping/probing -- what features are supported */
  49 static enum apanel_chip device_chip[APANEL_DEV_MAX];
  50 
  51 #define MAX_PANEL_KEYS  12
  52 
  53 struct apanel {
  54         struct input_polled_dev *ipdev;
  55         struct i2c_client *client;
  56         unsigned short keymap[MAX_PANEL_KEYS];
  57         u16    nkeys;
  58         struct led_classdev mail_led;
  59 };
  60 
  61 
  62 static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);
  63 
  64 static void report_key(struct input_dev *input, unsigned keycode)
  65 {
  66         pr_debug(APANEL ": report key %#x\n", keycode);
  67         input_report_key(input, keycode, 1);
  68         input_sync(input);
  69 
  70         input_report_key(input, keycode, 0);
  71         input_sync(input);
  72 }
  73 
  74 /* Poll for key changes
  75  *
  76  * Read Application keys via SMI
  77  *  A (0x4), B (0x8), Internet (0x2), Email (0x1).
  78  *
  79  * CD keys:
  80  * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
  81  */
  82 static void apanel_poll(struct input_polled_dev *ipdev)
  83 {
  84         struct apanel *ap = ipdev->private;
  85         struct input_dev *idev = ipdev->input;
  86         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
  87         s32 data;
  88         int i;
  89 
  90         data = i2c_smbus_read_word_data(ap->client, cmd);
  91         if (data < 0)
  92                 return; /* ignore errors (due to ACPI??) */
  93 
  94         /* write back to clear latch */
  95         i2c_smbus_write_word_data(ap->client, cmd, 0);
  96 
  97         if (!data)
  98                 return;
  99 
 100         dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
 101         for (i = 0; i < idev->keycodemax; i++)
 102                 if ((1u << i) & data)
 103                         report_key(idev, ap->keymap[i]);
 104 }
 105 
 106 static int mail_led_set(struct led_classdev *led,
 107                          enum led_brightness value)
 108 {
 109         struct apanel *ap = container_of(led, struct apanel, mail_led);
 110         u16 led_bits = value != LED_OFF ? 0x8000 : 0x0000;
 111 
 112         return i2c_smbus_write_word_data(ap->client, 0x10, led_bits);
 113 }
 114 
 115 static int apanel_remove(struct i2c_client *client)
 116 {
 117         struct apanel *ap = i2c_get_clientdata(client);
 118 
 119         if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
 120                 led_classdev_unregister(&ap->mail_led);
 121 
 122         input_unregister_polled_device(ap->ipdev);
 123         input_free_polled_device(ap->ipdev);
 124 
 125         return 0;
 126 }
 127 
 128 static void apanel_shutdown(struct i2c_client *client)
 129 {
 130         apanel_remove(client);
 131 }
 132 
 133 static const struct i2c_device_id apanel_id[] = {
 134         { "fujitsu_apanel", 0 },
 135         { }
 136 };
 137 MODULE_DEVICE_TABLE(i2c, apanel_id);
 138 
 139 static struct i2c_driver apanel_driver = {
 140         .driver = {
 141                 .name = APANEL,
 142         },
 143         .probe          = &apanel_probe,
 144         .remove         = &apanel_remove,
 145         .shutdown       = &apanel_shutdown,
 146         .id_table       = apanel_id,
 147 };
 148 
 149 static struct apanel apanel = {
 150         .keymap = {
 151                 [0] = KEY_MAIL,
 152                 [1] = KEY_WWW,
 153                 [2] = KEY_PROG2,
 154                 [3] = KEY_PROG1,
 155 
 156                 [8] = KEY_FORWARD,
 157                 [9] = KEY_REWIND,
 158                 [10] = KEY_STOPCD,
 159                 [11] = KEY_PLAYPAUSE,
 160 
 161         },
 162         .mail_led = {
 163                 .name = "mail:blue",
 164                 .brightness_set_blocking = mail_led_set,
 165         },
 166 };
 167 
 168 /* NB: Only one panel on the i2c. */
 169 static int apanel_probe(struct i2c_client *client,
 170                         const struct i2c_device_id *id)
 171 {
 172         struct apanel *ap;
 173         struct input_polled_dev *ipdev;
 174         struct input_dev *idev;
 175         u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
 176         int i, err = -ENOMEM;
 177 
 178         ap = &apanel;
 179 
 180         ipdev = input_allocate_polled_device();
 181         if (!ipdev)
 182                 goto out1;
 183 
 184         ap->ipdev = ipdev;
 185         ap->client = client;
 186 
 187         i2c_set_clientdata(client, ap);
 188 
 189         err = i2c_smbus_write_word_data(client, cmd, 0);
 190         if (err) {
 191                 dev_warn(&client->dev, APANEL ": smbus write error %d\n",
 192                          err);
 193                 goto out3;
 194         }
 195 
 196         ipdev->poll = apanel_poll;
 197         ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
 198         ipdev->private = ap;
 199 
 200         idev = ipdev->input;
 201         idev->name = APANEL_NAME " buttons";
 202         idev->phys = "apanel/input0";
 203         idev->id.bustype = BUS_HOST;
 204         idev->dev.parent = &client->dev;
 205 
 206         set_bit(EV_KEY, idev->evbit);
 207 
 208         idev->keycode = ap->keymap;
 209         idev->keycodesize = sizeof(ap->keymap[0]);
 210         idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;
 211 
 212         for (i = 0; i < idev->keycodemax; i++)
 213                 if (ap->keymap[i])
 214                         set_bit(ap->keymap[i], idev->keybit);
 215 
 216         err = input_register_polled_device(ipdev);
 217         if (err)
 218                 goto out3;
 219 
 220         if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
 221                 err = led_classdev_register(&client->dev, &ap->mail_led);
 222                 if (err)
 223                         goto out4;
 224         }
 225 
 226         return 0;
 227 out4:
 228         input_unregister_polled_device(ipdev);
 229 out3:
 230         input_free_polled_device(ipdev);
 231 out1:
 232         return err;
 233 }
 234 
 235 /* Scan the system ROM for the signature "FJKEYINF" */
 236 static __init const void __iomem *bios_signature(const void __iomem *bios)
 237 {
 238         ssize_t offset;
 239         const unsigned char signature[] = "FJKEYINF";
 240 
 241         for (offset = 0; offset < 0x10000; offset += 0x10) {
 242                 if (check_signature(bios + offset, signature,
 243                                     sizeof(signature)-1))
 244                         return bios + offset;
 245         }
 246         pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
 247                   signature);
 248         return NULL;
 249 }
 250 
 251 static int __init apanel_init(void)
 252 {
 253         void __iomem *bios;
 254         const void __iomem *p;
 255         u8 devno;
 256         unsigned char i2c_addr;
 257         int found = 0;
 258 
 259         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
 260 
 261         p = bios_signature(bios);
 262         if (!p) {
 263                 iounmap(bios);
 264                 return -ENODEV;
 265         }
 266 
 267         /* just use the first address */
 268         p += 8;
 269         i2c_addr = readb(p + 3) >> 1;
 270 
 271         for ( ; (devno = readb(p)) & 0x7f; p += 4) {
 272                 unsigned char method, slave, chip;
 273 
 274                 method = readb(p + 1);
 275                 chip = readb(p + 2);
 276                 slave = readb(p + 3) >> 1;
 277 
 278                 if (slave != i2c_addr) {
 279                         pr_notice(APANEL ": only one SMBus slave "
 280                                   "address supported, skipping device...\n");
 281                         continue;
 282                 }
 283 
 284                 /* translate alternative device numbers */
 285                 switch (devno) {
 286                 case 6:
 287                         devno = APANEL_DEV_APPBTN;
 288                         break;
 289                 case 7:
 290                         devno = APANEL_DEV_LED;
 291                         break;
 292                 }
 293 
 294                 if (devno >= APANEL_DEV_MAX)
 295                         pr_notice(APANEL ": unknown device %u found\n", devno);
 296                 else if (device_chip[devno] != CHIP_NONE)
 297                         pr_warn(APANEL ": duplicate entry for devno %u\n",
 298                                 devno);
 299 
 300                 else if (method != 1 && method != 2 && method != 4) {
 301                         pr_notice(APANEL ": unknown method %u for devno %u\n",
 302                                   method, devno);
 303                 } else {
 304                         device_chip[devno] = (enum apanel_chip) chip;
 305                         ++found;
 306                 }
 307         }
 308         iounmap(bios);
 309 
 310         if (found == 0) {
 311                 pr_info(APANEL ": no input devices reported by BIOS\n");
 312                 return -EIO;
 313         }
 314 
 315         return i2c_add_driver(&apanel_driver);
 316 }
 317 module_init(apanel_init);
 318 
 319 static void __exit apanel_cleanup(void)
 320 {
 321         i2c_del_driver(&apanel_driver);
 322 }
 323 module_exit(apanel_cleanup);
 324 
 325 MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
 326 MODULE_DESCRIPTION(APANEL_NAME " driver");
 327 MODULE_LICENSE("GPL");
 328 
 329 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
 330 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");

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