drivers/platform/chrome/chromeos_laptop.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 // Driver to instantiate Chromebook i2c/smbus devices.
 //
 // Copyright (C) 2012 Google, Inc.
 // Author: Benson Leung <bleung@chromium.org>

 #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt

 #include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/platform_data/atmel_mxt_ts.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>

 #define ATMEL_TP_I2C_ADDR	0x4b
 #define ATMEL_TP_I2C_BL_ADDR	0x25
 #define ATMEL_TS_I2C_ADDR	0x4a
 #define ATMEL_TS_I2C_BL_ADDR	0x26
 #define CYAPA_TP_I2C_ADDR	0x67
 #define ELAN_TP_I2C_ADDR	0x15
 #define ISL_ALS_I2C_ADDR	0x44
 #define TAOS_ALS_I2C_ADDR	0x29

 static const char *i2c_adapter_names[] = {
 	"SMBus I801 adapter",
 	"i915 gmbus vga",
 	"i915 gmbus panel",
 	"Synopsys DesignWare I2C adapter",
 };

 /* Keep this enum consistent with i2c_adapter_names */
 enum i2c_adapter_type {
 	I2C_ADAPTER_SMBUS = 0,
 	I2C_ADAPTER_VGADDC,
 	I2C_ADAPTER_PANEL,
 	I2C_ADAPTER_DESIGNWARE,
 };

 struct i2c_peripheral {
 	struct i2c_board_info board_info;
 	unsigned short alt_addr;

 	const char *dmi_name;
 	unsigned long irqflags;
 	struct resource irq_resource;

 	enum i2c_adapter_type type;
 	u32 pci_devid;

 	struct i2c_client *client;
 };

 #define MAX_I2C_PERIPHERALS 4

 struct chromeos_laptop {
 	struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
 };

 static struct chromeos_laptop *cros_laptop;

 static struct i2c_client *
 chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
 				      struct i2c_board_info *info,
 				      unsigned short alt_addr)
 {
 	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 	struct i2c_client *client;

 	/*
 	 * Add the i2c device. If we can't detect it at the primary
 	 * address we scan secondary addresses. In any case the client
 	 * structure gets assigned primary address.
 	 */
 	client = i2c_new_probed_device(adapter, info, addr_list, NULL);
 	if (!client && alt_addr) {
 		struct i2c_board_info dummy_info = {
 			I2C_BOARD_INFO("dummy", info->addr),
 		};
 		const unsigned short alt_addr_list[] = {
 			alt_addr, I2C_CLIENT_END
 		};
 		struct i2c_client *dummy;

 		dummy = i2c_new_probed_device(adapter, &dummy_info,
 					      alt_addr_list, NULL);
 		if (dummy) {
 			pr_debug("%d-%02x is probed at %02x\n",
 				 adapter->nr, info->addr, dummy->addr);
 			i2c_unregister_device(dummy);
 			client = i2c_new_device(adapter, info);
 		}
 	}

 	if (!client)
 		pr_debug("failed to register device %d-%02x\n",
 			 adapter->nr, info->addr);
 	else
 		pr_debug("added i2c device %d-%02x\n",
 			 adapter->nr, info->addr);

 	return client;
 }

 static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
 {
 	struct pci_dev *pdev;

 	if (!dev_is_pci(dev))
 		return false;

 	pdev = to_pci_dev(dev);
 	return devid == PCI_DEVID(pdev->bus->number, pdev->devfn);
 }

 static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
 {
 	struct i2c_peripheral *i2c_dev;
 	int i;

 	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 		i2c_dev = &cros_laptop->i2c_peripherals[i];

 		/* No more peripherals */
 		if (!i2c_dev->board_info.addr)
 			break;

 		/* Skip devices already created */
 		if (i2c_dev->client)
 			continue;

 		if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
 			    strlen(i2c_adapter_names[i2c_dev->type])))
 			continue;

 		if (i2c_dev->pci_devid &&
 		    !chromeos_laptop_match_adapter_devid(adapter->dev.parent,
 							 i2c_dev->pci_devid)) {
 			continue;
 		}

 		i2c_dev->client =
 			chromes_laptop_instantiate_i2c_device(adapter,
 							&i2c_dev->board_info,
 							i2c_dev->alt_addr);
 	}
 }

 static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
 {
 	struct i2c_peripheral *i2c_dev;
 	int i;

 	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 		i2c_dev = &cros_laptop->i2c_peripherals[i];

 		if (i2c_dev->client == client)
 			i2c_dev->client = NULL;
 	}
 }

 static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
 					     unsigned long action, void *data)
 {
 	struct device *dev = data;

 	switch (action) {
 	case BUS_NOTIFY_ADD_DEVICE:
 		if (dev->type == &i2c_adapter_type)
 			chromeos_laptop_check_adapter(to_i2c_adapter(dev));
 		break;

 	case BUS_NOTIFY_REMOVED_DEVICE:
 		if (dev->type == &i2c_client_type)
 			chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
 		break;
 	}

 	return 0;
 }

 static struct notifier_block chromeos_laptop_i2c_notifier = {
 	.notifier_call = chromeos_laptop_i2c_notifier_call,
 };

 static struct chromeos_laptop samsung_series_5_550 = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 			},
 			.dmi_name	= "lightsensor",
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static struct chromeos_laptop samsung_series_5 = {
 	.i2c_peripherals = {
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
 			},
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static int chromebook_pixel_tp_keys[] = {
 	KEY_RESERVED,
 	KEY_RESERVED,
 	KEY_RESERVED,
 	KEY_RESERVED,
 	KEY_RESERVED,
 	BTN_LEFT
 };

 static struct mxt_platform_data chromebook_pixel_tp_platform_data = {
 	.t19_num_keys		= ARRAY_SIZE(chromebook_pixel_tp_keys),
 	.t19_keymap		= chromebook_pixel_tp_keys,
 };

 static struct chromeos_laptop chromebook_pixel = {
 	.i2c_peripherals = {
 		/* Touch Screen. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("atmel_mxt_ts",
 						ATMEL_TS_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "touchscreen",
 			.irqflags	= IRQF_TRIGGER_FALLING,
 			.type		= I2C_ADAPTER_PANEL,
 			.alt_addr	= ATMEL_TS_I2C_BL_ADDR,
 		},
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("atmel_mxt_tp",
 						ATMEL_TP_I2C_ADDR),
 				.platform_data	=
 					&chromebook_pixel_tp_platform_data,
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.irqflags	= IRQF_TRIGGER_FALLING,
 			.type		= I2C_ADAPTER_VGADDC,
 			.alt_addr	= ATMEL_TP_I2C_BL_ADDR,
 		},
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 			},
 			.dmi_name	= "lightsensor",
 			.type		= I2C_ADAPTER_PANEL,
 		},
 	},
 };

 static struct chromeos_laptop hp_chromebook_14 = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 		},
 	},
 };

 static struct chromeos_laptop dell_chromebook_11 = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 		},
 		/* Elan Touchpad option. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 		},
 	},
 };

 static struct chromeos_laptop toshiba_cb35 = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 		},
 	},
 };

 static struct chromeos_laptop acer_c7_chromebook = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static struct chromeos_laptop acer_ac700 = {
 	.i2c_peripherals = {
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
 			},
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static struct chromeos_laptop acer_c720 = {
 	.i2c_peripherals = {
 		/* Touchscreen. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("atmel_mxt_ts",
 						ATMEL_TS_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "touchscreen",
 			.irqflags	= IRQF_TRIGGER_FALLING,
 			.type		= I2C_ADAPTER_DESIGNWARE,
 			.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
 			.alt_addr	= ATMEL_TS_I2C_BL_ADDR,
 		},
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 			.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
 		},
 		/* Elan Touchpad option. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 			.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
 		},
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 			},
 			.dmi_name	= "lightsensor",
 			.type		= I2C_ADAPTER_DESIGNWARE,
 			.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
 		},
 	},
 };

 static struct chromeos_laptop hp_pavilion_14_chromebook = {
 	.i2c_peripherals = {
 		/* Touchpad. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 				.flags		= I2C_CLIENT_WAKE,
 			},
 			.dmi_name	= "trackpad",
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static struct chromeos_laptop cr48 = {
 	.i2c_peripherals = {
 		/* Light Sensor. */
 		{
 			.board_info	= {
 				I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
 			},
 			.type		= I2C_ADAPTER_SMBUS,
 		},
 	},
 };

 static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
 	{
 		.ident = "Samsung Series 5 550",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 		},
 		.driver_data = (void *)&samsung_series_5_550,
 	},
 	{
 		.ident = "Samsung Series 5",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 		},
 		.driver_data = (void *)&samsung_series_5,
 	},
 	{
 		.ident = "Chromebook Pixel",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 		},
 		.driver_data = (void *)&chromebook_pixel,
 	},
 	{
 		.ident = "Wolf",
 		.matches = {
 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
 		},
 		.driver_data = (void *)&dell_chromebook_11,
 	},
 	{
 		.ident = "HP Chromebook 14",
 		.matches = {
 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
 		},
 		.driver_data = (void *)&hp_chromebook_14,
 	},
 	{
 		.ident = "Toshiba CB35",
 		.matches = {
 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
 		},
 		.driver_data = (void *)&toshiba_cb35,
 	},
 	{
 		.ident = "Acer C7 Chromebook",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 		},
 		.driver_data = (void *)&acer_c7_chromebook,
 	},
 	{
 		.ident = "Acer AC700",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 		},
 		.driver_data = (void *)&acer_ac700,
 	},
 	{
 		.ident = "Acer C720",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
 		},
 		.driver_data = (void *)&acer_c720,
 	},
 	{
 		.ident = "HP Pavilion 14 Chromebook",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 		},
 		.driver_data = (void *)&hp_pavilion_14_chromebook,
 	},
 	{
 		.ident = "Cr-48",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 		},
 		.driver_data = (void *)&cr48,
 	},
 	{ }
 };
 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);

 static int __init chromeos_laptop_scan_adapter(struct device *dev, void *data)
 {
 	struct i2c_adapter *adapter;

 	adapter = i2c_verify_adapter(dev);
 	if (adapter)
 		chromeos_laptop_check_adapter(adapter);

 	return 0;
 }

 static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
 {
 	const struct dmi_device *dmi_dev;
 	const struct dmi_dev_onboard *dev_data;

 	dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
 	if (!dmi_dev) {
 		pr_err("failed to find DMI device '%s'\n", dmi_name);
 		return -ENOENT;
 	}

 	dev_data = dmi_dev->device_data;
 	if (!dev_data) {
 		pr_err("failed to get data from DMI for '%s'\n", dmi_name);
 		return -EINVAL;
 	}

 	return dev_data->instance;
 }

 static struct chromeos_laptop * __init
 chromeos_laptop_prepare(const struct dmi_system_id *id)
 {
 	struct i2c_peripheral *i2c_dev;
 	int irq;
 	int i;

 	cros_laptop = (void *)id->driver_data;

 	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 		i2c_dev = &cros_laptop->i2c_peripherals[i];

 		if (!i2c_dev->dmi_name)
 			continue;

 		irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
 		if (irq < 0)
 			return ERR_PTR(irq);

 		i2c_dev->irq_resource  = (struct resource)
 			DEFINE_RES_NAMED(irq, 1, NULL,
 					 IORESOURCE_IRQ | i2c_dev->irqflags);
 		i2c_dev->board_info.resources = &i2c_dev->irq_resource;
 		i2c_dev->board_info.num_resources = 1;
 	}

 	return cros_laptop;
 }


 static int __init chromeos_laptop_init(void)
 {
 	const struct dmi_system_id *dmi_id;
 	int error;

 	dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
 	if (!dmi_id) {
 		pr_debug("unsupported system\n");
 		return -ENODEV;
 	}

 	pr_debug("DMI Matched %s\n", dmi_id->ident);

 	cros_laptop = chromeos_laptop_prepare(dmi_id->driver_data);
 	if (IS_ERR(cros_laptop))
 		return PTR_ERR(cros_laptop);

 	error = bus_register_notifier(&i2c_bus_type,
 				      &chromeos_laptop_i2c_notifier);
 	if (error) {
 		pr_err("failed to register i2c bus notifier: %d\n", error);
 		return error;
 	}

 	/*
 	 * Scan adapters that have been registered before we installed
 	 * the notifier to make sure we do not miss any devices.
 	 */
 	i2c_for_each_dev(NULL, chromeos_laptop_scan_adapter);

 	return 0;
 }

 static void __exit chromeos_laptop_exit(void)
 {
 	struct i2c_peripheral *i2c_dev;
 	int i;

 	bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);

 	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 		i2c_dev = &cros_laptop->i2c_peripherals[i];

 		/* No more peripherals */
 		if (!i2c_dev->board_info.type)
 			break;

 		if (i2c_dev->client)
 			i2c_unregister_device(i2c_dev->client);
 	}
 }

 module_init(chromeos_laptop_init);
 module_exit(chromeos_laptop_exit);

 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	// Driver to instantiate Chromebook i2c/smbus devices.
	//
	// Copyright (C) 2012 Google, Inc.
	// Author: Benson Leung <bleung@chromium.org>

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/dmi.h>
	#include <linux/i2c.h>
	#include <linux/platform_data/atmel_mxt_ts.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/ioport.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/platform_device.h>

	#define ATMEL_TP_I2C_ADDR 0x4b
	#define ATMEL_TP_I2C_BL_ADDR 0x25
	#define ATMEL_TS_I2C_ADDR 0x4a
	#define ATMEL_TS_I2C_BL_ADDR 0x26
	#define CYAPA_TP_I2C_ADDR 0x67
	#define ELAN_TP_I2C_ADDR 0x15
	#define ISL_ALS_I2C_ADDR 0x44
	#define TAOS_ALS_I2C_ADDR 0x29

	static const char *i2c_adapter_names[] = {
	"SMBus I801 adapter",
	"i915 gmbus vga",
	"i915 gmbus panel",
	"Synopsys DesignWare I2C adapter",
	};

	/* Keep this enum consistent with i2c_adapter_names */
	enum i2c_adapter_type {
	I2C_ADAPTER_SMBUS = 0,
	I2C_ADAPTER_VGADDC,
	I2C_ADAPTER_PANEL,
	I2C_ADAPTER_DESIGNWARE,
	};

	struct i2c_peripheral {
	struct i2c_board_info board_info;
	unsigned short alt_addr;

	const char *dmi_name;
	unsigned long irqflags;
	struct resource irq_resource;

	enum i2c_adapter_type type;
	u32 pci_devid;

	struct i2c_client *client;
	};

	#define MAX_I2C_PERIPHERALS 4

	struct chromeos_laptop {
	struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
	};

	static struct chromeos_laptop *cros_laptop;

	static struct i2c_client *
	chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
	struct i2c_board_info *info,
	unsigned short alt_addr)
	{
	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
	struct i2c_client *client;

	/*
	* Add the i2c device. If we can't detect it at the primary
	* address we scan secondary addresses. In any case the client
	* structure gets assigned primary address.
	*/
	client = i2c_new_probed_device(adapter, info, addr_list, NULL);
	if (!client && alt_addr) {
	struct i2c_board_info dummy_info = {
	I2C_BOARD_INFO("dummy", info->addr),
	};
	const unsigned short alt_addr_list[] = {
	alt_addr, I2C_CLIENT_END
	};
	struct i2c_client *dummy;

	dummy = i2c_new_probed_device(adapter, &dummy_info,
	alt_addr_list, NULL);
	if (dummy) {
	pr_debug("%d-%02x is probed at %02x\n",
	adapter->nr, info->addr, dummy->addr);
	i2c_unregister_device(dummy);
	client = i2c_new_device(adapter, info);
	}
	}

	if (!client)
	pr_debug("failed to register device %d-%02x\n",
	adapter->nr, info->addr);
	else
	pr_debug("added i2c device %d-%02x\n",
	adapter->nr, info->addr);

	return client;
	}

	static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
	{
	struct pci_dev *pdev;

	if (!dev_is_pci(dev))
	return false;

	pdev = to_pci_dev(dev);
	return devid == PCI_DEVID(pdev->bus->number, pdev->devfn);
	}

	static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
	{
	struct i2c_peripheral *i2c_dev;
	int i;

	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
	i2c_dev = &cros_laptop->i2c_peripherals[i];

	/* No more peripherals */
	if (!i2c_dev->board_info.addr)
	break;

	/* Skip devices already created */
	if (i2c_dev->client)
	continue;

	if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
	strlen(i2c_adapter_names[i2c_dev->type])))
	continue;

	if (i2c_dev->pci_devid &&
	!chromeos_laptop_match_adapter_devid(adapter->dev.parent,
	i2c_dev->pci_devid)) {
	continue;
	}

	i2c_dev->client =
	chromes_laptop_instantiate_i2c_device(adapter,
	&i2c_dev->board_info,
	i2c_dev->alt_addr);
	}
	}

	static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
	{
	struct i2c_peripheral *i2c_dev;
	int i;

	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
	i2c_dev = &cros_laptop->i2c_peripherals[i];

	if (i2c_dev->client == client)
	i2c_dev->client = NULL;
	}
	}

	static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
	unsigned long action, void *data)
	{
	struct device *dev = data;

	switch (action) {
	case BUS_NOTIFY_ADD_DEVICE:
	if (dev->type == &i2c_adapter_type)
	chromeos_laptop_check_adapter(to_i2c_adapter(dev));
	break;

	case BUS_NOTIFY_REMOVED_DEVICE:
	if (dev->type == &i2c_client_type)
	chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
	break;
	}

	return 0;
	}

	static struct notifier_block chromeos_laptop_i2c_notifier = {
	.notifier_call = chromeos_laptop_i2c_notifier_call,
	};

	static struct chromeos_laptop samsung_series_5_550 = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_SMBUS,
	},
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
	},
	.dmi_name = "lightsensor",
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static struct chromeos_laptop samsung_series_5 = {
	.i2c_peripherals = {
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
	},
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static int chromebook_pixel_tp_keys[] = {
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	BTN_LEFT
	};

	static struct mxt_platform_data chromebook_pixel_tp_platform_data = {
	.t19_num_keys = ARRAY_SIZE(chromebook_pixel_tp_keys),
	.t19_keymap = chromebook_pixel_tp_keys,
	};

	static struct chromeos_laptop chromebook_pixel = {
	.i2c_peripherals = {
	/* Touch Screen. */
	{
	.board_info = {
	I2C_BOARD_INFO("atmel_mxt_ts",
	ATMEL_TS_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "touchscreen",
	.irqflags = IRQF_TRIGGER_FALLING,
	.type = I2C_ADAPTER_PANEL,
	.alt_addr = ATMEL_TS_I2C_BL_ADDR,
	},
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("atmel_mxt_tp",
	ATMEL_TP_I2C_ADDR),
	.platform_data =
	&chromebook_pixel_tp_platform_data,
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.irqflags = IRQF_TRIGGER_FALLING,
	.type = I2C_ADAPTER_VGADDC,
	.alt_addr = ATMEL_TP_I2C_BL_ADDR,
	},
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
	},
	.dmi_name = "lightsensor",
	.type = I2C_ADAPTER_PANEL,
	},
	},
	};

	static struct chromeos_laptop hp_chromebook_14 = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	},
	},
	};

	static struct chromeos_laptop dell_chromebook_11 = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	},
	/* Elan Touchpad option. */
	{
	.board_info = {
	I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	},
	},
	};

	static struct chromeos_laptop toshiba_cb35 = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	},
	},
	};

	static struct chromeos_laptop acer_c7_chromebook = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static struct chromeos_laptop acer_ac700 = {
	.i2c_peripherals = {
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
	},
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static struct chromeos_laptop acer_c720 = {
	.i2c_peripherals = {
	/* Touchscreen. */
	{
	.board_info = {
	I2C_BOARD_INFO("atmel_mxt_ts",
	ATMEL_TS_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "touchscreen",
	.irqflags = IRQF_TRIGGER_FALLING,
	.type = I2C_ADAPTER_DESIGNWARE,
	.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
	.alt_addr = ATMEL_TS_I2C_BL_ADDR,
	},
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
	},
	/* Elan Touchpad option. */
	{
	.board_info = {
	I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_DESIGNWARE,
	.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
	},
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
	},
	.dmi_name = "lightsensor",
	.type = I2C_ADAPTER_DESIGNWARE,
	.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
	},
	},
	};

	static struct chromeos_laptop hp_pavilion_14_chromebook = {
	.i2c_peripherals = {
	/* Touchpad. */
	{
	.board_info = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags = I2C_CLIENT_WAKE,
	},
	.dmi_name = "trackpad",
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static struct chromeos_laptop cr48 = {
	.i2c_peripherals = {
	/* Light Sensor. */
	{
	.board_info = {
	I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
	},
	.type = I2C_ADAPTER_SMBUS,
	},
	},
	};

	static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
	{
	.ident = "Samsung Series 5 550",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
	},
	.driver_data = (void *)&samsung_series_5_550,
	},
	{
	.ident = "Samsung Series 5",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
	},
	.driver_data = (void *)&samsung_series_5,
	},
	{
	.ident = "Chromebook Pixel",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
	},
	.driver_data = (void *)&chromebook_pixel,
	},
	{
	.ident = "Wolf",
	.matches = {
	DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
	},
	.driver_data = (void *)&dell_chromebook_11,
	},
	{
	.ident = "HP Chromebook 14",
	.matches = {
	DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
	},
	.driver_data = (void *)&hp_chromebook_14,
	},
	{
	.ident = "Toshiba CB35",
	.matches = {
	DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
	},
	.driver_data = (void *)&toshiba_cb35,
	},
	{
	.ident = "Acer C7 Chromebook",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
	},
	.driver_data = (void *)&acer_c7_chromebook,
	},
	{
	.ident = "Acer AC700",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
	},
	.driver_data = (void *)&acer_ac700,
	},
	{
	.ident = "Acer C720",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
	},
	.driver_data = (void *)&acer_c720,
	},
	{
	.ident = "HP Pavilion 14 Chromebook",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
	},
	.driver_data = (void *)&hp_pavilion_14_chromebook,
	},
	{
	.ident = "Cr-48",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
	},
	.driver_data = (void *)&cr48,
	},
	{ }
	};
	MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);

	static int __init chromeos_laptop_scan_adapter(struct device dev, void data)
	{
	struct i2c_adapter *adapter;

	adapter = i2c_verify_adapter(dev);
	if (adapter)
	chromeos_laptop_check_adapter(adapter);

	return 0;
	}

	static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
	{
	const struct dmi_device *dmi_dev;
	const struct dmi_dev_onboard *dev_data;

	dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
	if (!dmi_dev) {
	pr_err("failed to find DMI device '%s'\n", dmi_name);
	return -ENOENT;
	}

	dev_data = dmi_dev->device_data;
	if (!dev_data) {
	pr_err("failed to get data from DMI for '%s'\n", dmi_name);
	return -EINVAL;
	}

	return dev_data->instance;
	}

	static struct chromeos_laptop * __init
	chromeos_laptop_prepare(const struct dmi_system_id *id)
	{
	struct i2c_peripheral *i2c_dev;
	int irq;
	int i;

	cros_laptop = (void *)id->driver_data;

	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
	i2c_dev = &cros_laptop->i2c_peripherals[i];

	if (!i2c_dev->dmi_name)
	continue;

	irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
	if (irq < 0)
	return ERR_PTR(irq);

	i2c_dev->irq_resource = (struct resource)
	DEFINE_RES_NAMED(irq, 1, NULL,
	IORESOURCE_IRQ \| i2c_dev->irqflags);
	i2c_dev->board_info.resources = &i2c_dev->irq_resource;
	i2c_dev->board_info.num_resources = 1;
	}

	return cros_laptop;
	}


	static int __init chromeos_laptop_init(void)
	{
	const struct dmi_system_id *dmi_id;
	int error;

	dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
	if (!dmi_id) {
	pr_debug("unsupported system\n");
	return -ENODEV;
	}

	pr_debug("DMI Matched %s\n", dmi_id->ident);

	cros_laptop = chromeos_laptop_prepare(dmi_id->driver_data);
	if (IS_ERR(cros_laptop))
	return PTR_ERR(cros_laptop);

	error = bus_register_notifier(&i2c_bus_type,
	&chromeos_laptop_i2c_notifier);
	if (error) {
	pr_err("failed to register i2c bus notifier: %d\n", error);
	return error;
	}

	/*
	* Scan adapters that have been registered before we installed
	* the notifier to make sure we do not miss any devices.
	*/
	i2c_for_each_dev(NULL, chromeos_laptop_scan_adapter);

	return 0;
	}

	static void __exit chromeos_laptop_exit(void)
	{
	struct i2c_peripheral *i2c_dev;
	int i;

	bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);

	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
	i2c_dev = &cros_laptop->i2c_peripherals[i];

	/* No more peripherals */
	if (!i2c_dev->board_info.type)
	break;

	if (i2c_dev->client)
	i2c_unregister_device(i2c_dev->client);
	}
	}

	module_init(chromeos_laptop_init);
	module_exit(chromeos_laptop_exit);

	MODULE_DESCRIPTION("Chrome OS Laptop driver");
	MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
	MODULE_LICENSE("GPL");