/*
* 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:*");
