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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:*"); |
351 |
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