// SPDX-License-Identifier: GPL-2.0-only/* *  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> * * 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.h>#include <linux/i2c.h>#include <linux/leds.h> #define APANEL_NAME	"Fujitsu Application Panel"#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_dev *idev;	struct i2c_client *client;	unsigned short keymap[MAX_PANEL_KEYS];	u16 nkeys;	struct led_classdev mail_led;}; static const unsigned short apanel_keymap[MAX_PANEL_KEYS] = {	[0] = KEY_MAIL,	[1] = KEY_WWW,	[2] = KEY_PROG2,	[3] = KEY_PROG1, 	[8] = KEY_FORWARD,	[9] = KEY_REWIND,	[10] = KEY_STOPCD,	[11] = KEY_PLAYPAUSE,}; static void report_key(struct input_dev *input, unsigned keycode){	dev_dbg(input->dev.parent, "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_dev *idev){	struct apanel *ap = input_get_drvdata(idev);	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]);} static int mail_led_set(struct led_classdev *led,			 enum led_brightness value){	struct apanel *ap = container_of(led, struct apanel, mail_led);	u16 led_bits = value != LED_OFF ? 0x8000 : 0x0000; 	return i2c_smbus_write_word_data(ap->client, 0x10, led_bits);} static int apanel_probe(struct i2c_client *client){	struct apanel *ap;	struct input_dev *idev;	u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;	int i, err; 	ap = devm_kzalloc(&client->dev, sizeof(*ap), GFP_KERNEL);	if (!ap)		return -ENOMEM; 	idev = devm_input_allocate_device(&client->dev);	if (!idev)		return -ENOMEM; 	ap->idev = idev;	ap->client = client; 	i2c_set_clientdata(client, ap); 	err = i2c_smbus_write_word_data(client, cmd, 0);	if (err) {		dev_warn(&client->dev, "smbus write error %d\n", err);		return err;	} 	input_set_drvdata(idev, ap); 	idev->name = APANEL_NAME " buttons";	idev->phys = "apanel/input0";	idev->id.bustype = BUS_HOST; 	memcpy(ap->keymap, apanel_keymap, sizeof(apanel_keymap));	idev->keycode = ap->keymap;	idev->keycodesize = sizeof(ap->keymap[0]);	idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4; 	set_bit(EV_KEY, idev->evbit);	for (i = 0; i < idev->keycodemax; i++)		if (ap->keymap[i])			set_bit(ap->keymap[i], idev->keybit); 	err = input_setup_polling(idev, apanel_poll);	if (err)		return err; 	input_set_poll_interval(idev, POLL_INTERVAL_DEFAULT); 	err = input_register_device(idev);	if (err)		return err; 	if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {		ap->mail_led.name = "mail:blue";		ap->mail_led.brightness_set_blocking = mail_led_set;		err = devm_led_classdev_register(&client->dev, &ap->mail_led);		if (err)			return err;	} 	return 0;} static void apanel_shutdown(struct i2c_client *client){	struct apanel *ap = i2c_get_clientdata(client); 	if (device_chip[APANEL_DEV_LED] != CHIP_NONE)		led_set_brightness(&ap->mail_led, LED_OFF);} static const struct i2c_device_id apanel_id[] = {	{ .name = "fujitsu_apanel" },	{ }};MODULE_DEVICE_TABLE(i2c, apanel_id); static struct i2c_driver apanel_driver = {	.driver = {		.name = APANEL,	},	.probe		= apanel_probe,	.shutdown	= apanel_shutdown,	.id_table	= apanel_id,}; /* 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, skipping 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_warn(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_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");