2 * Fujitsu Lifebook Application Panel button drive
4 * Copyright (C) 2007 Stephen Hemminger <shemminger@linux-foundation.org>
5 * Copyright (C) 2001-2003 Jochen Eisinger <jochen@penguin-breeder.org>
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.
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.
15 * For more details see:
16 * http://apanel.sourceforge.net/tech.php
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/ioport.h>
23 #include <linux/input-polldev.h>
24 #include <linux/i2c.h>
25 #include <linux/workqueue.h>
26 #include <linux/leds.h>
28 #define APANEL_NAME "Fujitsu Application Panel"
29 #define APANEL_VERSION "1.3.1"
30 #define APANEL "apanel"
32 /* How often we poll keys - msecs */
33 #define POLL_INTERVAL_DEFAULT 1000
35 /* Magic constants in BIOS that tell about buttons */
38 APANEL_DEV_APPBTN
= 1,
53 /* Result of BIOS snooping/probing -- what features are supported */
54 static enum apanel_chip device_chip
[APANEL_DEV_MAX
];
56 #define MAX_PANEL_KEYS 12
59 struct input_polled_dev
*ipdev
;
60 struct i2c_client
*client
;
61 unsigned short keymap
[MAX_PANEL_KEYS
];
64 struct work_struct led_work
;
65 struct led_classdev mail_led
;
69 static int apanel_probe(struct i2c_client
*, const struct i2c_device_id
*);
71 static void report_key(struct input_dev
*input
, unsigned keycode
)
73 pr_debug(APANEL
": report key %#x\n", keycode
);
74 input_report_key(input
, keycode
, 1);
77 input_report_key(input
, keycode
, 0);
81 /* Poll for key changes
83 * Read Application keys via SMI
84 * A (0x4), B (0x8), Internet (0x2), Email (0x1).
87 * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
89 static void apanel_poll(struct input_polled_dev
*ipdev
)
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;
97 data
= i2c_smbus_read_word_data(ap
->client
, cmd
);
99 return; /* ignore errors (due to ACPI??) */
101 /* write back to clear latch */
102 i2c_smbus_write_word_data(ap
->client
, cmd
, 0);
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
]);
113 /* Track state changes of LED */
114 static void led_update(struct work_struct
*work
)
116 struct apanel
*ap
= container_of(work
, struct apanel
, led_work
);
118 i2c_smbus_write_word_data(ap
->client
, 0x10, ap
->led_bits
);
121 static void mail_led_set(struct led_classdev
*led
,
122 enum led_brightness value
)
124 struct apanel
*ap
= container_of(led
, struct apanel
, mail_led
);
126 if (value
!= LED_OFF
)
127 ap
->led_bits
|= 0x8000;
129 ap
->led_bits
&= ~0x8000;
131 schedule_work(&ap
->led_work
);
134 static int apanel_remove(struct i2c_client
*client
)
136 struct apanel
*ap
= i2c_get_clientdata(client
);
138 if (device_chip
[APANEL_DEV_LED
] != CHIP_NONE
)
139 led_classdev_unregister(&ap
->mail_led
);
141 input_unregister_polled_device(ap
->ipdev
);
142 input_free_polled_device(ap
->ipdev
);
147 static void apanel_shutdown(struct i2c_client
*client
)
149 apanel_remove(client
);
152 static const struct i2c_device_id apanel_id
[] = {
153 { "fujitsu_apanel", 0 },
156 MODULE_DEVICE_TABLE(i2c
, apanel_id
);
158 static struct i2c_driver apanel_driver
= {
162 .probe
= &apanel_probe
,
163 .remove
= &apanel_remove
,
164 .shutdown
= &apanel_shutdown
,
165 .id_table
= apanel_id
,
168 static struct apanel apanel
= {
178 [11] = KEY_PLAYPAUSE
,
183 .brightness_set
= mail_led_set
,
187 /* NB: Only one panel on the i2c. */
188 static int apanel_probe(struct i2c_client
*client
,
189 const struct i2c_device_id
*id
)
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
;
199 ipdev
= input_allocate_polled_device();
206 i2c_set_clientdata(client
, ap
);
208 err
= i2c_smbus_write_word_data(client
, cmd
, 0);
210 dev_warn(&client
->dev
, APANEL
": smbus write error %d\n",
215 ipdev
->poll
= apanel_poll
;
216 ipdev
->poll_interval
= POLL_INTERVAL_DEFAULT
;
220 idev
->name
= APANEL_NAME
" buttons";
221 idev
->phys
= "apanel/input0";
222 idev
->id
.bustype
= BUS_HOST
;
223 idev
->dev
.parent
= &client
->dev
;
225 set_bit(EV_KEY
, idev
->evbit
);
227 idev
->keycode
= ap
->keymap
;
228 idev
->keycodesize
= sizeof(ap
->keymap
[0]);
229 idev
->keycodemax
= (device_chip
[APANEL_DEV_CDBTN
] != CHIP_NONE
) ? 12 : 4;
231 for (i
= 0; i
< idev
->keycodemax
; i
++)
233 set_bit(ap
->keymap
[i
], idev
->keybit
);
235 err
= input_register_polled_device(ipdev
);
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
);
248 input_unregister_polled_device(ipdev
);
250 input_free_polled_device(ipdev
);
255 /* Scan the system ROM for the signature "FJKEYINF" */
256 static __init
const void __iomem
*bios_signature(const void __iomem
*bios
)
259 const unsigned char signature
[] = "FJKEYINF";
261 for (offset
= 0; offset
< 0x10000; offset
+= 0x10) {
262 if (check_signature(bios
+ offset
, signature
,
263 sizeof(signature
)-1))
264 return bios
+ offset
;
266 pr_notice(APANEL
": Fujitsu BIOS signature '%s' not found...\n",
271 static int __init
apanel_init(void)
274 const void __iomem
*p
;
276 unsigned char i2c_addr
;
279 bios
= ioremap(0xF0000, 0x10000); /* Can't fail */
281 p
= bios_signature(bios
);
287 /* just use the first address */
289 i2c_addr
= readb(p
+ 3) >> 1;
291 for ( ; (devno
= readb(p
)) & 0x7f; p
+= 4) {
292 unsigned char method
, slave
, chip
;
294 method
= readb(p
+ 1);
296 slave
= readb(p
+ 3) >> 1;
298 if (slave
!= i2c_addr
) {
299 pr_notice(APANEL
": only one SMBus slave "
300 "address supported, skiping device...\n");
304 /* translate alternative device numbers */
307 devno
= APANEL_DEV_APPBTN
;
310 devno
= APANEL_DEV_LED
;
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
);
319 else if (method
!= 1 && method
!= 2 && method
!= 4) {
320 pr_notice(APANEL
": unknown method %u for devno %u\n",
323 device_chip
[devno
] = (enum apanel_chip
) chip
;
330 pr_info(APANEL
": no input devices reported by BIOS\n");
334 return i2c_add_driver(&apanel_driver
);
336 module_init(apanel_init
);
338 static void __exit
apanel_cleanup(void)
340 i2c_del_driver(&apanel_driver
);
342 module_exit(apanel_cleanup
);
344 MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
345 MODULE_DESCRIPTION(APANEL_NAME
" driver");
346 MODULE_LICENSE("GPL");
347 MODULE_VERSION(APANEL_VERSION
);
349 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
350 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");
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