aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/apanel.c
blob: a8d2b8db4e359fbe521cce279909527cea4d984e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
/*
 *  Fujitsu Lifebook Application Panel button drive
 *
 *  Copyright (C) 2007 Stephen Hemminger <shemminger@linux-foundation.org>
 *  Copyright (C) 2001-2003 Jochen Eisinger <jochen@penguin-breeder.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * Many Fujitsu Lifebook laptops have a small panel of buttons that are
 * accessible via the i2c/smbus interface. This driver polls those
 * buttons and generates input events.
 *
 * For more details see:
 *	http://apanel.sourceforge.net/tech.php
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/input-polldev.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/leds.h>

#define APANEL_NAME	"Fujitsu Application Panel"
#define APANEL_VERSION	"1.3.1"
#define APANEL		"apanel"

/* How often we poll keys - msecs */
#define POLL_INTERVAL_DEFAULT	1000

/* Magic constants in BIOS that tell about buttons */
enum apanel_devid {
	APANEL_DEV_NONE	  = 0,
	APANEL_DEV_APPBTN = 1,
	APANEL_DEV_CDBTN  = 2,
	APANEL_DEV_LCD	  = 3,
	APANEL_DEV_LED	  = 4,

	APANEL_DEV_MAX,
};

enum apanel_chip {
	CHIP_NONE    = 0,
	CHIP_OZ992C  = 1,
	CHIP_OZ163T  = 2,
	CHIP_OZ711M3 = 4,
};

/* Result of BIOS snooping/probing -- what features are supported */
static enum apanel_chip device_chip[APANEL_DEV_MAX];

#define MAX_PANEL_KEYS	12

struct apanel {
	struct input_polled_dev *ipdev;
	struct i2c_client *client;
	unsigned short keymap[MAX_PANEL_KEYS];
	u16    nkeys;
	u16    led_bits;
	struct work_struct led_work;
	struct led_classdev mail_led;
};


static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);

static void report_key(struct input_dev *input, unsigned keycode)
{
	pr_debug(APANEL ": report key %#x\n", keycode);
	input_report_key(input, keycode, 1);
	input_sync(input);

	input_report_key(input, keycode, 0);
	input_sync(input);
}

/* Poll for key changes
 *
 * Read Application keys via SMI
 *  A (0x4), B (0x8), Internet (0x2), Email (0x1).
 *
 * CD keys:
 * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
 */
static void apanel_poll(struct input_polled_dev *ipdev)
{
	struct apanel *ap = ipdev->private;
	struct input_dev *idev = ipdev->input;
	u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
	s32 data;
	int i;

	data = i2c_smbus_read_word_data(ap->client, cmd);
	if (data < 0)
		return;	/* ignore errors (due to ACPI??) */

	/* write back to clear latch */
	i2c_smbus_write_word_data(ap->client, cmd, 0);

	if (!data)
		return;

	dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
	for (i = 0; i < idev->keycodemax; i++)
		if ((1u << i) & data)
			report_key(idev, ap->keymap[i]);
}

/* Track state changes of LED */
static void led_update(struct work_struct *work)
{
	struct apanel *ap = container_of(work, struct apanel, led_work);

	i2c_smbus_write_word_data(ap->client, 0x10, ap->led_bits);
}

static void mail_led_set(struct led_classdev *led,
			 enum led_brightness value)
{
	struct apanel *ap = container_of(led, struct apanel, mail_led);

	if (value != LED_OFF)
		ap->led_bits |= 0x8000;
	else
		ap->led_bits &= ~0x8000;

	schedule_work(&ap->led_work);
}

static int apanel_remove(struct i2c_client *client)
{
	struct apanel *ap = i2c_get_clientdata(client);

	if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
		led_classdev_unregister(&ap->mail_led);

	input_unregister_polled_device(ap->ipdev);
	input_free_polled_device(ap->ipdev);

	return 0;
}

static void apanel_shutdown(struct i2c_client *client)
{
	apanel_remove(client);
}

static const struct i2c_device_id apanel_id[] = {
	{ "fujitsu_apanel", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, apanel_id);

static struct i2c_driver apanel_driver = {
	.driver = {
		.name = APANEL,
	},
	.probe		= &apanel_probe,
	.remove		= &apanel_remove,
	.shutdown	= &apanel_shutdown,
	.id_table	= apanel_id,
};

static struct apanel apanel = {
	.keymap = {
		[0] = KEY_MAIL,
		[1] = KEY_WWW,
		[2] = KEY_PROG2,
		[3] = KEY_PROG1,

		[8] = KEY_FORWARD,
		[9] = KEY_REWIND,
		[10] = KEY_STOPCD,
		[11] = KEY_PLAYPAUSE,

	},
	.mail_led = {
		.name = "mail:blue",
		.brightness_set = mail_led_set,
	},
};

/* NB: Only one panel on the i2c. */
static int apanel_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct apanel *ap;
	struct input_polled_dev *ipdev;
	struct input_dev *idev;
	u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
	int i, err = -ENOMEM;

	ap = &apanel;

	ipdev = input_allocate_polled_device();
	if (!ipdev)
		goto out1;

	ap->ipdev = ipdev;
	ap->client = client;

	i2c_set_clientdata(client, ap);

	err = i2c_smbus_write_word_data(client, cmd, 0);
	if (err) {
		dev_warn(&client->dev, APANEL ": smbus write error %d\n",
			 err);
		goto out3;
	}

	ipdev->poll = apanel_poll;
	ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
	ipdev->private = ap;

	idev = ipdev->input;
	idev->name = APANEL_NAME " buttons";
	idev->phys = "apanel/input0";
	idev->id.bustype = BUS_HOST;
	idev->dev.parent = &client->dev;

	set_bit(EV_KEY, idev->evbit);

	idev->keycode = ap->keymap;
	idev->keycodesize = sizeof(ap->keymap[0]);
	idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;

	for (i = 0; i < idev->keycodemax; i++)
		if (ap->keymap[i])
			set_bit(ap->keymap[i], idev->keybit);

	err = input_register_polled_device(ipdev);
	if (err)
		goto out3;

	INIT_WORK(&ap->led_work, led_update);
	if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
		err = led_classdev_register(&client->dev, &ap->mail_led);
		if (err)
			goto out4;
	}

	return 0;
out4:
	input_unregister_polled_device(ipdev);
out3:
	input_free_polled_device(ipdev);
out1:
	return err;
}

/* Scan the system ROM for the signature "FJKEYINF" */
static __init const void __iomem *bios_signature(const void __iomem *bios)
{
	ssize_t offset;
	const unsigned char signature[] = "FJKEYINF";

	for (offset = 0; offset < 0x10000; offset += 0x10) {
		if (check_signature(bios + offset, signature,
				    sizeof(signature)-1))
			return bios + offset;
	}
	pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
		  signature);
	return NULL;
}

static int __init apanel_init(void)
{
	void __iomem *bios;
	const void __iomem *p;
	u8 devno;
	unsigned char i2c_addr;
	int found = 0;

	bios = ioremap(0xF0000, 0x10000); /* Can't fail */

	p = bios_signature(bios);
	if (!p) {
		iounmap(bios);
		return -ENODEV;
	}

	/* just use the first address */
	p += 8;
	i2c_addr = readb(p + 3) >> 1;

	for ( ; (devno = readb(p)) & 0x7f; p += 4) {
		unsigned char method, slave, chip;

		method = readb(p + 1);
		chip = readb(p + 2);
		slave = readb(p + 3) >> 1;

		if (slave != i2c_addr) {
			pr_notice(APANEL ": only one SMBus slave "
				  "address supported, skiping device...\n");
			continue;
		}

		/* translate alternative device numbers */
		switch (devno) {
		case 6:
			devno = APANEL_DEV_APPBTN;
			break;
		case 7:
			devno = APANEL_DEV_LED;
			break;
		}

		if (devno >= APANEL_DEV_MAX)
			pr_notice(APANEL ": unknown device %u found\n", devno);
		else if (device_chip[devno] != CHIP_NONE)
			pr_warning(APANEL ": duplicate entry for devno %u\n", devno);

		else if (method != 1 && method != 2 && method != 4) {
			pr_notice(APANEL ": unknown method %u for devno %u\n",
				  method, devno);
		} else {
			device_chip[devno] = (enum apanel_chip) chip;
			++found;
		}
	}
	iounmap(bios);

	if (found == 0) {
		pr_info(APANEL ": no input devices reported by BIOS\n");
		return -EIO;
	}

	return i2c_add_driver(&apanel_driver);
}
module_init(apanel_init);

static void __exit apanel_cleanup(void)
{
	i2c_del_driver(&apanel_driver);
}
module_exit(apanel_cleanup);

MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
MODULE_DESCRIPTION(APANEL_NAME " driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(APANEL_VERSION);

MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");