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305 lines
7.0 KiB
305 lines
7.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Fujitsu Lifebook Application Panel button drive |
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* |
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* Copyright (C) 2007 Stephen Hemminger <[email protected]> |
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* Copyright (C) 2001-2003 Jochen Eisinger <[email protected]> |
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* |
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* Many Fujitsu Lifebook laptops have a small panel of buttons that are |
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* accessible via the i2c/smbus interface. This driver polls those |
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* buttons and generates input events. |
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* |
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* For more details see: |
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* http://apanel.sourceforge.net/tech.php |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/ioport.h> |
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#include <linux/io.h> |
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#include <linux/input.h> |
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#include <linux/i2c.h> |
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#include <linux/leds.h> |
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#define APANEL_NAME "Fujitsu Application Panel" |
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#define APANEL "apanel" |
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/* How often we poll keys - msecs */ |
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#define POLL_INTERVAL_DEFAULT 1000 |
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/* Magic constants in BIOS that tell about buttons */ |
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enum apanel_devid { |
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APANEL_DEV_NONE = 0, |
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APANEL_DEV_APPBTN = 1, |
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APANEL_DEV_CDBTN = 2, |
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APANEL_DEV_LCD = 3, |
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APANEL_DEV_LED = 4, |
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APANEL_DEV_MAX, |
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}; |
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enum apanel_chip { |
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CHIP_NONE = 0, |
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CHIP_OZ992C = 1, |
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CHIP_OZ163T = 2, |
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CHIP_OZ711M3 = 4, |
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}; |
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/* Result of BIOS snooping/probing -- what features are supported */ |
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static enum apanel_chip device_chip[APANEL_DEV_MAX]; |
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#define MAX_PANEL_KEYS 12 |
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struct apanel { |
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struct input_dev *idev; |
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struct i2c_client *client; |
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unsigned short keymap[MAX_PANEL_KEYS]; |
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u16 nkeys; |
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struct led_classdev mail_led; |
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}; |
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static const unsigned short apanel_keymap[MAX_PANEL_KEYS] = { |
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[0] = KEY_MAIL, |
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[1] = KEY_WWW, |
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[2] = KEY_PROG2, |
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[3] = KEY_PROG1, |
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[8] = KEY_FORWARD, |
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[9] = KEY_REWIND, |
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[10] = KEY_STOPCD, |
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[11] = KEY_PLAYPAUSE, |
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}; |
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static void report_key(struct input_dev *input, unsigned keycode) |
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{ |
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dev_dbg(input->dev.parent, "report key %#x\n", keycode); |
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input_report_key(input, keycode, 1); |
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input_sync(input); |
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input_report_key(input, keycode, 0); |
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input_sync(input); |
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} |
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/* Poll for key changes |
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* |
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* Read Application keys via SMI |
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* A (0x4), B (0x8), Internet (0x2), Email (0x1). |
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* |
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* CD keys: |
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* Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800) |
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*/ |
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static void apanel_poll(struct input_dev *idev) |
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{ |
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struct apanel *ap = input_get_drvdata(idev); |
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u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8; |
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s32 data; |
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int i; |
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data = i2c_smbus_read_word_data(ap->client, cmd); |
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if (data < 0) |
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return; /* ignore errors (due to ACPI??) */ |
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/* write back to clear latch */ |
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i2c_smbus_write_word_data(ap->client, cmd, 0); |
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if (!data) |
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return; |
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dev_dbg(&idev->dev, APANEL ": data %#x\n", data); |
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for (i = 0; i < idev->keycodemax; i++) |
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if ((1u << i) & data) |
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report_key(idev, ap->keymap[i]); |
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} |
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static int mail_led_set(struct led_classdev *led, |
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enum led_brightness value) |
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{ |
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struct apanel *ap = container_of(led, struct apanel, mail_led); |
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u16 led_bits = value != LED_OFF ? 0x8000 : 0x0000; |
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return i2c_smbus_write_word_data(ap->client, 0x10, led_bits); |
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} |
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static int apanel_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct apanel *ap; |
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struct input_dev *idev; |
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u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8; |
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int i, err; |
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ap = devm_kzalloc(&client->dev, sizeof(*ap), GFP_KERNEL); |
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if (!ap) |
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return -ENOMEM; |
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idev = devm_input_allocate_device(&client->dev); |
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if (!idev) |
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return -ENOMEM; |
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ap->idev = idev; |
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ap->client = client; |
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i2c_set_clientdata(client, ap); |
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err = i2c_smbus_write_word_data(client, cmd, 0); |
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if (err) { |
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dev_warn(&client->dev, "smbus write error %d\n", err); |
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return err; |
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} |
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input_set_drvdata(idev, ap); |
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idev->name = APANEL_NAME " buttons"; |
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idev->phys = "apanel/input0"; |
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idev->id.bustype = BUS_HOST; |
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memcpy(ap->keymap, apanel_keymap, sizeof(apanel_keymap)); |
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idev->keycode = ap->keymap; |
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idev->keycodesize = sizeof(ap->keymap[0]); |
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idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4; |
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set_bit(EV_KEY, idev->evbit); |
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for (i = 0; i < idev->keycodemax; i++) |
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if (ap->keymap[i]) |
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set_bit(ap->keymap[i], idev->keybit); |
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err = input_setup_polling(idev, apanel_poll); |
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if (err) |
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return err; |
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input_set_poll_interval(idev, POLL_INTERVAL_DEFAULT); |
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err = input_register_device(idev); |
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if (err) |
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return err; |
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if (device_chip[APANEL_DEV_LED] != CHIP_NONE) { |
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ap->mail_led.name = "mail:blue"; |
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ap->mail_led.brightness_set_blocking = mail_led_set; |
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err = devm_led_classdev_register(&client->dev, &ap->mail_led); |
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if (err) |
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return err; |
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} |
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return 0; |
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} |
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static void apanel_shutdown(struct i2c_client *client) |
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{ |
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struct apanel *ap = i2c_get_clientdata(client); |
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if (device_chip[APANEL_DEV_LED] != CHIP_NONE) |
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led_set_brightness(&ap->mail_led, LED_OFF); |
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} |
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static const struct i2c_device_id apanel_id[] = { |
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{ "fujitsu_apanel", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, apanel_id); |
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static struct i2c_driver apanel_driver = { |
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.driver = { |
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.name = APANEL, |
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}, |
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.probe = apanel_probe, |
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.shutdown = apanel_shutdown, |
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.id_table = apanel_id, |
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}; |
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/* Scan the system ROM for the signature "FJKEYINF" */ |
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static __init const void __iomem *bios_signature(const void __iomem *bios) |
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{ |
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ssize_t offset; |
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const unsigned char signature[] = "FJKEYINF"; |
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for (offset = 0; offset < 0x10000; offset += 0x10) { |
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if (check_signature(bios + offset, signature, |
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sizeof(signature)-1)) |
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return bios + offset; |
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} |
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pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n", |
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signature); |
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return NULL; |
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} |
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static int __init apanel_init(void) |
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{ |
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void __iomem *bios; |
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const void __iomem *p; |
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u8 devno; |
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unsigned char i2c_addr; |
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int found = 0; |
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bios = ioremap(0xF0000, 0x10000); /* Can't fail */ |
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p = bios_signature(bios); |
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if (!p) { |
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iounmap(bios); |
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return -ENODEV; |
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} |
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/* just use the first address */ |
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p += 8; |
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i2c_addr = readb(p + 3) >> 1; |
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for ( ; (devno = readb(p)) & 0x7f; p += 4) { |
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unsigned char method, slave, chip; |
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method = readb(p + 1); |
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chip = readb(p + 2); |
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slave = readb(p + 3) >> 1; |
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if (slave != i2c_addr) { |
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pr_notice(APANEL ": only one SMBus slave " |
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"address supported, skipping device...\n"); |
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continue; |
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} |
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/* translate alternative device numbers */ |
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switch (devno) { |
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case 6: |
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devno = APANEL_DEV_APPBTN; |
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break; |
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case 7: |
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devno = APANEL_DEV_LED; |
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break; |
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} |
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if (devno >= APANEL_DEV_MAX) |
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pr_notice(APANEL ": unknown device %u found\n", devno); |
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else if (device_chip[devno] != CHIP_NONE) |
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pr_warn(APANEL ": duplicate entry for devno %u\n", |
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devno); |
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else if (method != 1 && method != 2 && method != 4) { |
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pr_notice(APANEL ": unknown method %u for devno %u\n", |
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method, devno); |
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} else { |
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device_chip[devno] = (enum apanel_chip) chip; |
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++found; |
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} |
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} |
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iounmap(bios); |
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if (found == 0) { |
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pr_info(APANEL ": no input devices reported by BIOS\n"); |
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return -EIO; |
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} |
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return i2c_add_driver(&apanel_driver); |
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} |
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module_init(apanel_init); |
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static void __exit apanel_cleanup(void) |
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{ |
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i2c_del_driver(&apanel_driver); |
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} |
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module_exit(apanel_cleanup); |
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MODULE_AUTHOR("Stephen Hemminger <[email protected]>"); |
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MODULE_DESCRIPTION(APANEL_NAME " driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*"); |
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MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");
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