/* * 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 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:*");