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 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:*"); 351