[deliverable/linux.git] / drivers / platform / x86 / chromeos_laptop.c

/*
 *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
 *
 *  Author : Benson Leung <bleung@chromium.org>
 *
 *  Copyright (C) 2012 Google, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/module.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 ISL_ALS_I2C_ADDR	0x44
#define TAOS_ALS_I2C_ADDR	0x29

static struct i2c_client *als;
static struct i2c_client *tp;
static struct i2c_client *ts;

const char *i2c_adapter_names[] = {
	"SMBus I801 adapter",
};

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

static struct i2c_board_info __initdata cyapa_device = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags		= I2C_CLIENT_WAKE,
};

static struct i2c_board_info __initdata isl_als_device = {
	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
};

static struct i2c_board_info __initdata tsl2583_als_device = {
	I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
};

static struct i2c_board_info __initdata tsl2563_als_device = {
	I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
};

static struct i2c_board_info __initdata atmel_224s_tp_device = {
	I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
	.platform_data = NULL,
	.flags		= I2C_CLIENT_WAKE,
};

static struct i2c_board_info __initdata atmel_1664s_device = {
	I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
	.platform_data = NULL,
	.flags		= I2C_CLIENT_WAKE,
};

static struct i2c_client __init *__add_probed_i2c_device(
		const char *name,
		int bus,
		struct i2c_board_info *info,
		const unsigned short *addrs)
{
	const struct dmi_device *dmi_dev;
	const struct dmi_dev_onboard *dev_data;
	struct i2c_adapter *adapter;
	struct i2c_client *client;

	if (bus < 0)
		return NULL;
	/*
	 * If a name is specified, look for irq platform information stashed
	 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
	 */
	if (name) {
		dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
		if (!dmi_dev) {
			pr_err("%s failed to dmi find device %s.\n",
			       __func__,
			       name);
			return NULL;
		}
		dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
		if (!dev_data) {
			pr_err("%s failed to get data from dmi for %s.\n",
			       __func__, name);
			return NULL;
		}
		info->irq = dev_data->instance;
	}

	adapter = i2c_get_adapter(bus);
	if (!adapter) {
		pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
		return NULL;
	}

	/* add the i2c device */
	client = i2c_new_probed_device(adapter, info, addrs, NULL);
	if (!client)
		pr_err("%s failed to register device %d-%02x\n",
		       __func__, bus, info->addr);
	else
		pr_debug("%s added i2c device %d-%02x\n",
			 __func__, bus, info->addr);

	i2c_put_adapter(adapter);
	return client;
}

static int __init __find_i2c_adap(struct device *dev, void *data)
{
	const char *name = data;
	static const char *prefix = "i2c-";
	struct i2c_adapter *adapter;
	if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
		return 0;
	adapter = to_i2c_adapter(dev);
	return (strncmp(adapter->name, name, strlen(name)) == 0);
}

static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
{
	struct device *dev = NULL;
	struct i2c_adapter *adapter;
	const char *name = i2c_adapter_names[type];
	/* find the adapter by name */
	dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
			      __find_i2c_adap);
	if (!dev) {
		pr_err("%s: i2c adapter %s not found on system.\n", __func__,
		       name);
		return -ENODEV;
	}
	adapter = to_i2c_adapter(dev);
	return adapter->nr;
}

/*
 * Takes a list of addresses in addrs as such :
 * { addr1, ... , addrn, I2C_CLIENT_END };
 * add_probed_i2c_device will use i2c_new_probed_device
 * and probe for devices at all of the addresses listed.
 * Returns NULL if no devices found.
 * See Documentation/i2c/instantiating-devices for more information.
 */
static __init struct i2c_client *add_probed_i2c_device(
		const char *name,
		enum i2c_adapter_type type,
		struct i2c_board_info *info,
		const unsigned short *addrs)
{
	return __add_probed_i2c_device(name,
				       find_i2c_adapter_num(type),
				       info,
				       addrs);
}

/*
 * Probes for a device at a single address, the one provided by
 * info->addr.
 * Returns NULL if no device found.
 */
static struct i2c_client __init *add_smbus_device(const char *name,
						  struct i2c_board_info *info)
{
	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
	return __add_probed_i2c_device(name,
				       find_i2c_adapter_num(I2C_ADAPTER_SMBUS),
				       info,
				       addr_list);
}

static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
{
	/* add cyapa touchpad on smbus */
	tp = add_smbus_device("trackpad", &cyapa_device);
	return 0;
}

static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
{
	const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
					     ATMEL_TP_I2C_ADDR,
					     I2C_CLIENT_END };

	/* add atmel mxt touchpad on VGA DDC GMBus */
	tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
				   &atmel_224s_tp_device, addr_list);
	return 0;
}

static int __init setup_atmel_1664s_ts(const struct dmi_system_id *id)
{
	const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
					     ATMEL_TS_I2C_ADDR,
					     I2C_CLIENT_END };

	/* add atmel mxt touch device on PANEL GMBus */
	ts = add_probed_i2c_device("touchscreen", I2C_ADAPTER_PANEL,
				   &atmel_1664s_device, addr_list);
	return 0;
}


static int __init setup_isl29018_als(const struct dmi_system_id *id)
{
	/* add isl29018 light sensor */
	als = add_smbus_device("lightsensor", &isl_als_device);
	return 0;
}

static int __init setup_tsl2583_als(const struct dmi_system_id *id)
{
	/* add tsl2583 light sensor on smbus */
	als = add_smbus_device(NULL, &tsl2583_als_device);
	return 0;
}

static int __init setup_tsl2563_als(const struct dmi_system_id *id)
{
	/* add tsl2563 light sensor on smbus */
	als = add_smbus_device(NULL, &tsl2563_als_device);
	return 0;
}

static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
	{
		.ident = "Samsung Series 5 550 - Touchpad",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
		},
		.callback = setup_cyapa_smbus_tp,
	},
	{
		.ident = "Chromebook Pixel - Touchscreen",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
		},
		.callback = setup_atmel_1664s_ts,
	},
	{
		.ident = "Chromebook Pixel - Touchpad",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
		},
		.callback = setup_atmel_224s_tp,
	},
	{
		.ident = "Samsung Series 5 550 - Light Sensor",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
		},
		.callback = setup_isl29018_als,
	},
	{
		.ident = "Acer C7 Chromebook - Touchpad",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
		},
		.callback = setup_cyapa_smbus_tp,
	},
	{
		.ident = "HP Pavilion 14 Chromebook - Touchpad",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
		},
		.callback = setup_cyapa_smbus_tp,
	},
	{
		.ident = "Samsung Series 5 - Light Sensor",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
		},
		.callback = setup_tsl2583_als,
	},
	{
		.ident = "Cr-48 - Light Sensor",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
		},
		.callback = setup_tsl2563_als,
	},
	{
		.ident = "Acer AC700 - Light Sensor",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
		},
		.callback = setup_tsl2563_als,
	},
	{ }
};
MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);

static int __init chromeos_laptop_init(void)
{
	if (!dmi_check_system(chromeos_laptop_dmi_table)) {
		pr_debug("%s unsupported system.\n", __func__);
		return -ENODEV;
	}
	return 0;
}

static void __exit chromeos_laptop_exit(void)
{
	if (als)
		i2c_unregister_device(als);
	if (tp)
		i2c_unregister_device(tp);
	if (ts)
		i2c_unregister_device(ts);
}

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");
Commit	Line	Data
d1381f45 BL	1	/*
	2	* chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
	3	*
	4	* Author : Benson Leung <bleung@chromium.org>
	5	*
	6	* Copyright (C) 2012 Google, Inc.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	*/
	23
	24	#include <linux/dmi.h>
	25	#include <linux/i2c.h>
	26	#include <linux/module.h>
	27
8e1ad4c4 BL	28	#define ATMEL_TP_I2C_ADDR 0x4b
8e1ad4c4 BL	29	#define ATMEL_TP_I2C_BL_ADDR 0x25
33a84f8a YS	30	#define ATMEL_TS_I2C_ADDR 0x4a
33a84f8a YS	31	#define ATMEL_TS_I2C_BL_ADDR 0x26
d1381f45 BL	32	#define CYAPA_TP_I2C_ADDR 0x67
d1381f45 BL	33	#define ISL_ALS_I2C_ADDR 0x44
aabf3f44	34	#define TAOS_ALS_I2C_ADDR 0x29
d1381f45 BL	35
	36	static struct i2c_client *als;
	37	static struct i2c_client *tp;
33a84f8a	38	static struct i2c_client *ts;
d1381f45 BL	39
	40	const char *i2c_adapter_names[] = {
	41	"SMBus I801 adapter",
	42	};
	43
	44	/* Keep this enum consistent with i2c_adapter_names */
	45	enum i2c_adapter_type {
	46	I2C_ADAPTER_SMBUS = 0,
	47	};
	48
	49	static struct i2c_board_info __initdata cyapa_device = {
	50	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	51	.flags = I2C_CLIENT_WAKE,
	52	};
	53
	54	static struct i2c_board_info __initdata isl_als_device = {
	55	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
	56	};
	57
8016bcbc BL	58	static struct i2c_board_info __initdata tsl2583_als_device = {
	59	I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
	60	};
	61
aabf3f44 BL	62	static struct i2c_board_info __initdata tsl2563_als_device = {
	63	I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
	64	};
	65
8e1ad4c4 BL	66	static struct i2c_board_info __initdata atmel_224s_tp_device = {
	67	I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
	68	.platform_data = NULL,
	69	.flags = I2C_CLIENT_WAKE,
	70	};
	71
33a84f8a YS	72	static struct i2c_board_info __initdata atmel_1664s_device = {
	73	I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
	74	.platform_data = NULL,
	75	.flags = I2C_CLIENT_WAKE,
	76	};
	77
d1381f45 BL	78	static struct i2c_client __init *__add_probed_i2c_device(
	79	const char *name,
	80	int bus,
	81	struct i2c_board_info *info,
	82	const unsigned short *addrs)
	83	{
	84	const struct dmi_device *dmi_dev;
	85	const struct dmi_dev_onboard *dev_data;
	86	struct i2c_adapter *adapter;
	87	struct i2c_client *client;
	88
	89	if (bus < 0)
	90	return NULL;
	91	/*
	92	* If a name is specified, look for irq platform information stashed
	93	* in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
	94	*/
	95	if (name) {
	96	dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
	97	if (!dmi_dev) {
	98	pr_err("%s failed to dmi find device %s.\n",
	99	__func__,
	100	name);
	101	return NULL;
	102	}
	103	dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
	104	if (!dev_data) {
	105	pr_err("%s failed to get data from dmi for %s.\n",
	106	__func__, name);
	107	return NULL;
	108	}
	109	info->irq = dev_data->instance;
	110	}
	111
	112	adapter = i2c_get_adapter(bus);
	113	if (!adapter) {
	114	pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
	115	return NULL;
	116	}
	117
	118	/* add the i2c device */
	119	client = i2c_new_probed_device(adapter, info, addrs, NULL);
	120	if (!client)
	121	pr_err("%s failed to register device %d-%02x\n",
	122	__func__, bus, info->addr);
	123	else
	124	pr_debug("%s added i2c device %d-%02x\n",
	125	__func__, bus, info->addr);
	126
	127	i2c_put_adapter(adapter);
	128	return client;
	129	}
	130
	131	static int __init __find_i2c_adap(struct device dev, void data)
	132	{
	133	const char *name = data;
	134	static const char *prefix = "i2c-";
	135	struct i2c_adapter *adapter;
	136	if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
	137	return 0;
	138	adapter = to_i2c_adapter(dev);
	139	return (strncmp(adapter->name, name, strlen(name)) == 0);
	140	}
	141
142	static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
143	{
144	struct device *dev = NULL;
145	struct i2c_adapter *adapter;
146	const char *name = i2c_adapter_names[type];
147	/* find the adapter by name */
148	dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
149	__find_i2c_adap);
150	if (!dev) {
151	pr_err("%s: i2c adapter %s not found on system.\n", __func__,
152	name);
153	return -ENODEV;
154	}
155	adapter = to_i2c_adapter(dev);
156	return adapter->nr;
157	}
158
bcaf089c BL	159	/*
	160	* Takes a list of addresses in addrs as such :
	161	* { addr1, ... , addrn, I2C_CLIENT_END };
	162	* add_probed_i2c_device will use i2c_new_probed_device
	163	* and probe for devices at all of the addresses listed.
	164	* Returns NULL if no devices found.
	165	* See Documentation/i2c/instantiating-devices for more information.
	166	*/
	167	static __init struct i2c_client *add_probed_i2c_device(
	168	const char *name,
	169	enum i2c_adapter_type type,
	170	struct i2c_board_info *info,
	171	const unsigned short *addrs)
	172	{
	173	return __add_probed_i2c_device(name,
	174	find_i2c_adapter_num(type),
	175	info,
	176	addrs);
	177	}
	178
d1381f45 BL	179	/*
	180	* Probes for a device at a single address, the one provided by
	181	* info->addr.
	182	* Returns NULL if no device found.
	183	*/
	184	static struct i2c_client __init add_smbus_device(const char name,
	185	struct i2c_board_info *info)
	186	{
	187	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
	188	return __add_probed_i2c_device(name,
	189	find_i2c_adapter_num(I2C_ADAPTER_SMBUS),
	190	info,
	191	addr_list);
	192	}
	193
6e71094d	194	static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
d1381f45 BL	195	{
	196	/* add cyapa touchpad on smbus */
	197	tp = add_smbus_device("trackpad", &cyapa_device);
	198	return 0;
	199	}
	200
8e1ad4c4 BL	201	static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
	202	{
	203	const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
	204	ATMEL_TP_I2C_ADDR,
	205	I2C_CLIENT_END };
	206
	207	/* add atmel mxt touchpad on VGA DDC GMBus */
	208	tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
	209	&atmel_224s_tp_device, addr_list);
	210	return 0;
	211	}
	212
33a84f8a YS	213	static int __init setup_atmel_1664s_ts(const struct dmi_system_id *id)
	214	{
	215	const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
	216	ATMEL_TS_I2C_ADDR,
	217	I2C_CLIENT_END };
	218
	219	/* add atmel mxt touch device on PANEL GMBus */
	220	ts = add_probed_i2c_device("touchscreen", I2C_ADAPTER_PANEL,
	221	&atmel_1664s_device, addr_list);
	222	return 0;
	223	}
	224
8e1ad4c4	225
d1381f45 BL	226	static int __init setup_isl29018_als(const struct dmi_system_id *id)
	227	{
	228	/* add isl29018 light sensor */
	229	als = add_smbus_device("lightsensor", &isl_als_device);
	230	return 0;
	231	}
	232
8016bcbc BL	233	static int __init setup_tsl2583_als(const struct dmi_system_id *id)
	234	{
	235	/* add tsl2583 light sensor on smbus */
	236	als = add_smbus_device(NULL, &tsl2583_als_device);
	237	return 0;
	238	}
	239
aabf3f44 BL	240	static int __init setup_tsl2563_als(const struct dmi_system_id *id)
	241	{
	242	/* add tsl2563 light sensor on smbus */
	243	als = add_smbus_device(NULL, &tsl2563_als_device);
	244	return 0;
	245	}
	246
d1381f45 BL	247	static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
	248	{
	249	.ident = "Samsung Series 5 550 - Touchpad",
	250	.matches = {
	251	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
	252	DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
	253	},
6e71094d	254	.callback = setup_cyapa_smbus_tp,
d1381f45	255	},
33a84f8a YS	256	{
	257	.ident = "Chromebook Pixel - Touchscreen",
	258	.matches = {
	259	DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
	260	DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
	261	},
	262	.callback = setup_atmel_1664s_ts,
	263	},
8e1ad4c4 BL	264	{
	265	.ident = "Chromebook Pixel - Touchpad",
	266	.matches = {
	267	DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
	268	DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
	269	},
	270	.callback = setup_atmel_224s_tp,
	271	},
d1381f45 BL	272	{
	273	.ident = "Samsung Series 5 550 - Light Sensor",
	274	.matches = {
	275	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
	276	DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
	277	},
	278	.callback = setup_isl29018_als,
	279	},
261f171f BL	280	{
	281	.ident = "Acer C7 Chromebook - Touchpad",
	282	.matches = {
	283	DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
	284	},
	285	.callback = setup_cyapa_smbus_tp,
e65a624b BL	286	},
	287	{
	288	.ident = "HP Pavilion 14 Chromebook - Touchpad",
	289	.matches = {
	290	DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
	291	},
	292	.callback = setup_cyapa_smbus_tp,
261f171f	293	},
8016bcbc BL	294	{
	295	.ident = "Samsung Series 5 - Light Sensor",
	296	.matches = {
	297	DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
	298	},
	299	.callback = setup_tsl2583_als,
	300	},
aabf3f44 BL	301	{
	302	.ident = "Cr-48 - Light Sensor",
	303	.matches = {
	304	DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
	305	},
	306	.callback = setup_tsl2563_als,
	307	},
	308	{
	309	.ident = "Acer AC700 - Light Sensor",
	310	.matches = {
	311	DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
	312	},
	313	.callback = setup_tsl2563_als,
	314	},
d1381f45 BL	315	{ }
	316	};
	317	MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
	318
	319	static int __init chromeos_laptop_init(void)
	320	{
	321	if (!dmi_check_system(chromeos_laptop_dmi_table)) {
	322	pr_debug("%s unsupported system.\n", __func__);
	323	return -ENODEV;
	324	}
	325	return 0;
	326	}
	327
	328	static void __exit chromeos_laptop_exit(void)
	329	{
	330	if (als)
	331	i2c_unregister_device(als);
	332	if (tp)
	333	i2c_unregister_device(tp);
33a84f8a YS	334	if (ts)
33a84f8a YS	335	i2c_unregister_device(ts);
d1381f45 BL	336	}
	337
	338	module_init(chromeos_laptop_init);
	339	module_exit(chromeos_laptop_exit);
	340
	341	MODULE_DESCRIPTION("Chrome OS Laptop driver");
	342	MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
	343	MODULE_LICENSE("GPL");