[linux.git] / drivers / acpi / i2c_ec.c

/*
 * SMBus driver for ACPI Embedded Controller ($Revision: 1.3 $)
 *
 * Copyright (c) 2002, 2005 Ducrot Bruno
 * Copyright (c) 2005 Rich Townsend (tiny hacks & tweaks)
 *
 * 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 version 2.
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/delay.h>

#include "i2c_ec.h"

#define	xudelay(t)	udelay(t)
#define	xmsleep(t)	msleep(t)

#define ACPI_EC_HC_COMPONENT	0x00080000
#define ACPI_EC_HC_CLASS	"ec_hc_smbus"
#define ACPI_EC_HC_HID		"ACPI0001"
#define ACPI_EC_HC_DEVICE_NAME	"EC HC smbus"

#define _COMPONENT		ACPI_EC_HC_COMPONENT

ACPI_MODULE_NAME("i2c_ec");

static int acpi_ec_hc_add(struct acpi_device *device);
static int acpi_ec_hc_remove(struct acpi_device *device, int type);

static struct acpi_driver acpi_ec_hc_driver = {
	.name = "i2c_ec",
	.class = ACPI_EC_HC_CLASS,
	.ids = ACPI_EC_HC_HID,
	.ops = {
		.add = acpi_ec_hc_add,
		.remove = acpi_ec_hc_remove,
		},
};

/* Various bit mask for EC_SC (R) */
#define OBF		0x01
#define IBF		0x02
#define CMD		0x08
#define BURST		0x10
#define SCI_EVT		0x20
#define SMI_EVT		0x40

/* Commands for EC_SC (W) */
#define RD_EC		0x80
#define WR_EC		0x81
#define BE_EC		0x82
#define BD_EC		0x83
#define QR_EC		0x84

/*
 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
 */

#define ACPI_EC_SMB_PRTCL	0x00	/* protocol, PEC */
#define ACPI_EC_SMB_STS		0x01	/* status */
#define ACPI_EC_SMB_ADDR	0x02	/* address */
#define ACPI_EC_SMB_CMD		0x03	/* command */
#define ACPI_EC_SMB_DATA	0x04	/* 32 data registers */
#define ACPI_EC_SMB_BCNT	0x24	/* number of data bytes */
#define ACPI_EC_SMB_ALRM_A	0x25	/* alarm address */
#define ACPI_EC_SMB_ALRM_D	0x26	/* 2 bytes alarm data */

#define ACPI_EC_SMB_STS_DONE	0x80
#define ACPI_EC_SMB_STS_ALRM	0x40
#define ACPI_EC_SMB_STS_RES	0x20
#define ACPI_EC_SMB_STS_STATUS	0x1f

#define ACPI_EC_SMB_STATUS_OK		0x00
#define ACPI_EC_SMB_STATUS_FAIL		0x07
#define ACPI_EC_SMB_STATUS_DNAK		0x10
#define ACPI_EC_SMB_STATUS_DERR		0x11
#define ACPI_EC_SMB_STATUS_CMD_DENY	0x12
#define ACPI_EC_SMB_STATUS_UNKNOWN	0x13
#define ACPI_EC_SMB_STATUS_ACC_DENY	0x17
#define ACPI_EC_SMB_STATUS_TIMEOUT	0x18
#define ACPI_EC_SMB_STATUS_NOTSUP	0x19
#define ACPI_EC_SMB_STATUS_BUSY		0x1A
#define ACPI_EC_SMB_STATUS_PEC		0x1F

#define ACPI_EC_SMB_PRTCL_WRITE			0x00
#define ACPI_EC_SMB_PRTCL_READ			0x01
#define ACPI_EC_SMB_PRTCL_QUICK			0x02
#define ACPI_EC_SMB_PRTCL_BYTE			0x04
#define ACPI_EC_SMB_PRTCL_BYTE_DATA		0x06
#define ACPI_EC_SMB_PRTCL_WORD_DATA		0x08
#define ACPI_EC_SMB_PRTCL_BLOCK_DATA		0x0a
#define ACPI_EC_SMB_PRTCL_PROC_CALL		0x0c
#define ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL	0x0d
#define ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA	0x4a
#define ACPI_EC_SMB_PRTCL_PEC			0x80

/* Length of pre/post transaction sleep (msec) */
#define ACPI_EC_SMB_TRANSACTION_SLEEP		1
#define ACPI_EC_SMB_ACCESS_SLEEP1		1
#define ACPI_EC_SMB_ACCESS_SLEEP2		10

static int acpi_ec_smb_read(struct acpi_ec_smbus *smbus, u8 address, u8 * data)
{
	u8 val;
	int err;

	err = ec_read(smbus->base + address, &val);
	if (!err) {
		*data = val;
	}
	xmsleep(ACPI_EC_SMB_TRANSACTION_SLEEP);
	return (err);
}

static int acpi_ec_smb_write(struct acpi_ec_smbus *smbus, u8 address, u8 data)
{
	int err;

	err = ec_write(smbus->base + address, data);
	return (err);
}

static int
acpi_ec_smb_access(struct i2c_adapter *adap, u16 addr, unsigned short flags,
		   char read_write, u8 command, int size,
		   union i2c_smbus_data *data)
{
	struct acpi_ec_smbus *smbus = adap->algo_data;
	unsigned char protocol, len = 0, pec, temp[2] = { 0, 0 };
	int i;

	if (read_write == I2C_SMBUS_READ) {
		protocol = ACPI_EC_SMB_PRTCL_READ;
	} else {
		protocol = ACPI_EC_SMB_PRTCL_WRITE;
	}
	pec = (flags & I2C_CLIENT_PEC) ? ACPI_EC_SMB_PRTCL_PEC : 0;

	switch (size) {

	case I2C_SMBUS_QUICK:
		protocol |= ACPI_EC_SMB_PRTCL_QUICK;
		read_write = I2C_SMBUS_WRITE;
		break;

	case I2C_SMBUS_BYTE:
		if (read_write == I2C_SMBUS_WRITE) {
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
		}
		protocol |= ACPI_EC_SMB_PRTCL_BYTE;
		break;

	case I2C_SMBUS_BYTE_DATA:
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		if (read_write == I2C_SMBUS_WRITE) {
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
		}
		protocol |= ACPI_EC_SMB_PRTCL_BYTE_DATA;
		break;

	case I2C_SMBUS_WORD_DATA:
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		if (read_write == I2C_SMBUS_WRITE) {
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1,
					  data->word >> 8);
		}
		protocol |= ACPI_EC_SMB_PRTCL_WORD_DATA | pec;
		break;

	case I2C_SMBUS_BLOCK_DATA:
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		if (read_write == I2C_SMBUS_WRITE) {
			len = min_t(u8, data->block[0], 32);
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
			for (i = 0; i < len; i++)
				acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
						  data->block[i + 1]);
		}
		protocol |= ACPI_EC_SMB_PRTCL_BLOCK_DATA | pec;
		break;

	case I2C_SMBUS_I2C_BLOCK_DATA:
		len = min_t(u8, data->block[0], 32);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
		if (read_write == I2C_SMBUS_WRITE) {
			for (i = 0; i < len; i++) {
				acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
						  data->block[i + 1]);
			}
		}
		protocol |= ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA;
		break;

	case I2C_SMBUS_PROC_CALL:
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1, data->word >> 8);
		protocol = ACPI_EC_SMB_PRTCL_PROC_CALL | pec;
		read_write = I2C_SMBUS_READ;
		break;

	case I2C_SMBUS_BLOCK_PROC_CALL:
		protocol |= pec;
		len = min_t(u8, data->block[0], 31);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
		acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
		for (i = 0; i < len; i++)
			acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
					  data->block[i + 1]);
		protocol = ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL | pec;
		read_write = I2C_SMBUS_READ;
		break;

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "EC SMBus adapter: "
				  "Unsupported transaction %d\n", size));
		return (-1);
	}

	acpi_ec_smb_write(smbus, ACPI_EC_SMB_ADDR, addr << 1);
	acpi_ec_smb_write(smbus, ACPI_EC_SMB_PRTCL, protocol);

	acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);

	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
		xudelay(500);
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
	}
	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
		xmsleep(ACPI_EC_SMB_ACCESS_SLEEP2);
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
	}
	if ((~temp[0] & ACPI_EC_SMB_STS_DONE)
	    || (temp[0] & ACPI_EC_SMB_STS_STATUS)) {
		return (-1);
	}

	if (read_write == I2C_SMBUS_WRITE) {
		return (0);
	}

	switch (size) {

	case I2C_SMBUS_BYTE:
	case I2C_SMBUS_BYTE_DATA:
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, &data->byte);
		break;

	case I2C_SMBUS_WORD_DATA:
	case I2C_SMBUS_PROC_CALL:
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, temp + 0);
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + 1, temp + 1);
		data->word = (temp[1] << 8) | temp[0];
		break;

	case I2C_SMBUS_BLOCK_DATA:
	case I2C_SMBUS_BLOCK_PROC_CALL:
		len = 0;
		acpi_ec_smb_read(smbus, ACPI_EC_SMB_BCNT, &len);
		len = min_t(u8, len, 32);
	case I2C_SMBUS_I2C_BLOCK_DATA:
		for (i = 0; i < len; i++)
			acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + i,
					 data->block + i + 1);
		data->block[0] = len;
		break;
	}

	return (0);
}

static u32 acpi_ec_smb_func(struct i2c_adapter *adapter)
{

	return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_BLOCK_DATA |
		I2C_FUNC_SMBUS_PROC_CALL |
		I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
		I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_HWPEC_CALC);
}

static const struct i2c_algorithm acpi_ec_smbus_algorithm = {
	.smbus_xfer = acpi_ec_smb_access,
	.functionality = acpi_ec_smb_func,
};

static int acpi_ec_hc_add(struct acpi_device *device)
{
	int status;
	unsigned long val;
	struct acpi_ec_hc *ec_hc;
	struct acpi_ec_smbus *smbus;

	if (!device) {
		return -EINVAL;
	}

	ec_hc = kzalloc(sizeof(struct acpi_ec_hc), GFP_KERNEL);
	if (!ec_hc) {
		return -ENOMEM;
	}

	smbus = kzalloc(sizeof(struct acpi_ec_smbus), GFP_KERNEL);
	if (!smbus) {
		kfree(ec_hc);
		return -ENOMEM;
	}

	ec_hc->handle = device->handle;
	strcpy(acpi_device_name(device), ACPI_EC_HC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_HC_CLASS);
	acpi_driver_data(device) = ec_hc;

	status = acpi_evaluate_integer(ec_hc->handle, "_EC", NULL, &val);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error obtaining _EC\n"));
		kfree(ec_hc);
		kfree(smbus);
		return -EIO;
	}

	smbus->ec = acpi_driver_data(device->parent);
	smbus->base = (val & 0xff00ull) >> 8;
	smbus->alert = val & 0xffull;

	smbus->adapter.owner = THIS_MODULE;
	smbus->adapter.algo = &acpi_ec_smbus_algorithm;
	smbus->adapter.algo_data = smbus;
	smbus->adapter.dev.parent = &device->dev;

	if (i2c_add_adapter(&smbus->adapter)) {
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
				  "EC SMBus adapter: Failed to register adapter\n"));
		kfree(smbus);
		kfree(ec_hc);
		return -EIO;
	}

	ec_hc->smbus = smbus;

	printk(KERN_INFO PREFIX "%s [%s]\n",
	       acpi_device_name(device), acpi_device_bid(device));

	return AE_OK;
}

static int acpi_ec_hc_remove(struct acpi_device *device, int type)
{
	struct acpi_ec_hc *ec_hc;

	if (!device) {
		return -EINVAL;
	}
	ec_hc = acpi_driver_data(device);

	i2c_del_adapter(&ec_hc->smbus->adapter);
	kfree(ec_hc->smbus);
	kfree(ec_hc);

	return AE_OK;
}

static int __init acpi_ec_hc_init(void)
{
	int result;

	result = acpi_bus_register_driver(&acpi_ec_hc_driver);
	if (result < 0) {
		return -ENODEV;
	}
	return 0;
}

static void __exit acpi_ec_hc_exit(void)
{
	acpi_bus_unregister_driver(&acpi_ec_hc_driver);
}

struct acpi_ec_hc *acpi_get_ec_hc(struct acpi_device *device)
{
	return acpi_driver_data(device->parent);
}

EXPORT_SYMBOL(acpi_get_ec_hc);

module_init(acpi_ec_hc_init);
module_exit(acpi_ec_hc_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ducrot Bruno");
MODULE_DESCRIPTION("ACPI EC SMBus driver");
Commit	Line	Data
3f86b832 RT	1	/*
	2	* SMBus driver for ACPI Embedded Controller ($Revision: 1.3 $)
	3	*
	4	* Copyright (c) 2002, 2005 Ducrot Bruno
	5	* Copyright (c) 2005 Rich Townsend (tiny hacks & tweaks)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation version 2.
	10	*/
	11
	12	#include <linux/version.h>
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/kernel.h>
	16	#include <linux/stddef.h>
3f86b832 RT	17	#include <linux/init.h>
	18	#include <linux/i2c.h>
	19	#include <linux/acpi.h>
	20	#include <linux/delay.h>
	21
	22	#include "i2c_ec.h"
	23
	24	#define xudelay(t) udelay(t)
	25	#define xmsleep(t) msleep(t)
	26
	27	#define ACPI_EC_HC_COMPONENT 0x00080000
	28	#define ACPI_EC_HC_CLASS "ec_hc_smbus"
	29	#define ACPI_EC_HC_HID "ACPI0001"
3f86b832 RT	30	#define ACPI_EC_HC_DEVICE_NAME "EC HC smbus"
	31
	32	#define _COMPONENT ACPI_EC_HC_COMPONENT
	33
f52fd66d	34	ACPI_MODULE_NAME("i2c_ec");
3f86b832 RT	35
	36	static int acpi_ec_hc_add(struct acpi_device *device);
	37	static int acpi_ec_hc_remove(struct acpi_device *device, int type);
	38
	39	static struct acpi_driver acpi_ec_hc_driver = {
c2b6705b	40	.name = "i2c_ec",
3f86b832 RT	41	.class = ACPI_EC_HC_CLASS,
	42	.ids = ACPI_EC_HC_HID,
	43	.ops = {
	44	.add = acpi_ec_hc_add,
	45	.remove = acpi_ec_hc_remove,
	46	},
	47	};
	48
	49	/* Various bit mask for EC_SC (R) */
	50	#define OBF 0x01
	51	#define IBF 0x02
	52	#define CMD 0x08
	53	#define BURST 0x10
	54	#define SCI_EVT 0x20
	55	#define SMI_EVT 0x40
	56
	57	/* Commands for EC_SC (W) */
	58	#define RD_EC 0x80
	59	#define WR_EC 0x81
	60	#define BE_EC 0x82
	61	#define BD_EC 0x83
	62	#define QR_EC 0x84
	63
	64	/*
	65	* ACPI 2.0 chapter 13 SMBus 2.0 EC register model
	66	*/
	67
	68	#define ACPI_EC_SMB_PRTCL 0x00 /* protocol, PEC */
	69	#define ACPI_EC_SMB_STS 0x01 /* status */
	70	#define ACPI_EC_SMB_ADDR 0x02 /* address */
	71	#define ACPI_EC_SMB_CMD 0x03 /* command */
	72	#define ACPI_EC_SMB_DATA 0x04 /* 32 data registers */
	73	#define ACPI_EC_SMB_BCNT 0x24 /* number of data bytes */
	74	#define ACPI_EC_SMB_ALRM_A 0x25 /* alarm address */
	75	#define ACPI_EC_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
	76
	77	#define ACPI_EC_SMB_STS_DONE 0x80
	78	#define ACPI_EC_SMB_STS_ALRM 0x40
	79	#define ACPI_EC_SMB_STS_RES 0x20
	80	#define ACPI_EC_SMB_STS_STATUS 0x1f
	81
	82	#define ACPI_EC_SMB_STATUS_OK 0x00
	83	#define ACPI_EC_SMB_STATUS_FAIL 0x07
	84	#define ACPI_EC_SMB_STATUS_DNAK 0x10
	85	#define ACPI_EC_SMB_STATUS_DERR 0x11
	86	#define ACPI_EC_SMB_STATUS_CMD_DENY 0x12
	87	#define ACPI_EC_SMB_STATUS_UNKNOWN 0x13
	88	#define ACPI_EC_SMB_STATUS_ACC_DENY 0x17
	89	#define ACPI_EC_SMB_STATUS_TIMEOUT 0x18
	90	#define ACPI_EC_SMB_STATUS_NOTSUP 0x19
	91	#define ACPI_EC_SMB_STATUS_BUSY 0x1A
	92	#define ACPI_EC_SMB_STATUS_PEC 0x1F
	93
	94	#define ACPI_EC_SMB_PRTCL_WRITE 0x00
	95	#define ACPI_EC_SMB_PRTCL_READ 0x01
	96	#define ACPI_EC_SMB_PRTCL_QUICK 0x02
	97	#define ACPI_EC_SMB_PRTCL_BYTE 0x04
	98	#define ACPI_EC_SMB_PRTCL_BYTE_DATA 0x06
	99	#define ACPI_EC_SMB_PRTCL_WORD_DATA 0x08
	100	#define ACPI_EC_SMB_PRTCL_BLOCK_DATA 0x0a
	101	#define ACPI_EC_SMB_PRTCL_PROC_CALL 0x0c
	102	#define ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
	103	#define ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
	104	#define ACPI_EC_SMB_PRTCL_PEC 0x80
105
106	/* Length of pre/post transaction sleep (msec) */
107	#define ACPI_EC_SMB_TRANSACTION_SLEEP 1
108	#define ACPI_EC_SMB_ACCESS_SLEEP1 1
109	#define ACPI_EC_SMB_ACCESS_SLEEP2 10
110
111	static int acpi_ec_smb_read(struct acpi_ec_smbus smbus, u8 address, u8 data)
112	{
113	u8 val;
114	int err;
115
3f86b832 RT	116	err = ec_read(smbus->base + address, &val);
	117	if (!err) {
	118	*data = val;
	119	}
	120	xmsleep(ACPI_EC_SMB_TRANSACTION_SLEEP);
	121	return (err);
	122	}
	123
	124	static int acpi_ec_smb_write(struct acpi_ec_smbus *smbus, u8 address, u8 data)
	125	{
	126	int err;
	127
3f86b832 RT	128	err = ec_write(smbus->base + address, data);
	129	return (err);
	130	}
	131
	132	static int
	133	acpi_ec_smb_access(struct i2c_adapter *adap, u16 addr, unsigned short flags,
	134	char read_write, u8 command, int size,
	135	union i2c_smbus_data *data)
	136	{
	137	struct acpi_ec_smbus *smbus = adap->algo_data;
	138	unsigned char protocol, len = 0, pec, temp[2] = { 0, 0 };
	139	int i;
	140
3f86b832 RT	141	if (read_write == I2C_SMBUS_READ) {
	142	protocol = ACPI_EC_SMB_PRTCL_READ;
	143	} else {
	144	protocol = ACPI_EC_SMB_PRTCL_WRITE;
	145	}
	146	pec = (flags & I2C_CLIENT_PEC) ? ACPI_EC_SMB_PRTCL_PEC : 0;
	147
	148	switch (size) {
	149
	150	case I2C_SMBUS_QUICK:
	151	protocol \|= ACPI_EC_SMB_PRTCL_QUICK;
	152	read_write = I2C_SMBUS_WRITE;
	153	break;
	154
	155	case I2C_SMBUS_BYTE:
	156	if (read_write == I2C_SMBUS_WRITE) {
	157	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
	158	}
	159	protocol \|= ACPI_EC_SMB_PRTCL_BYTE;
	160	break;
	161
	162	case I2C_SMBUS_BYTE_DATA:
	163	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
	164	if (read_write == I2C_SMBUS_WRITE) {
	165	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
	166	}
	167	protocol \|= ACPI_EC_SMB_PRTCL_BYTE_DATA;
	168	break;
	169
	170	case I2C_SMBUS_WORD_DATA:
	171	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
	172	if (read_write == I2C_SMBUS_WRITE) {
	173	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
	174	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1,
	175	data->word >> 8);
	176	}
	177	protocol \|= ACPI_EC_SMB_PRTCL_WORD_DATA \| pec;
	178	break;
	179
	180	case I2C_SMBUS_BLOCK_DATA:
	181	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
	182	if (read_write == I2C_SMBUS_WRITE) {
	183	len = min_t(u8, data->block[0], 32);
	184	acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
	185	for (i = 0; i < len; i++)
	186	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
	187	data->block[i + 1]);
	188	}
	189	protocol \|= ACPI_EC_SMB_PRTCL_BLOCK_DATA \| pec;
	190	break;
	191
	192	case I2C_SMBUS_I2C_BLOCK_DATA:
	193	len = min_t(u8, data->block[0], 32);
	194	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
	195	acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
	196	if (read_write == I2C_SMBUS_WRITE) {
	197	for (i = 0; i < len; i++) {
	198	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
	199	data->block[i + 1]);
	200	}
	201	}
	202	protocol \|= ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA;
	203	break;
	204
205	case I2C_SMBUS_PROC_CALL:
206	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
207	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
208	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1, data->word >> 8);
209	protocol = ACPI_EC_SMB_PRTCL_PROC_CALL \| pec;
210	read_write = I2C_SMBUS_READ;
211	break;
212
213	case I2C_SMBUS_BLOCK_PROC_CALL:
214	protocol \|= pec;
215	len = min_t(u8, data->block[0], 31);
216	acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
217	acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
218	for (i = 0; i < len; i++)
219	acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
220	data->block[i + 1]);
221	protocol = ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL \| pec;
222	read_write = I2C_SMBUS_READ;
223	break;
224
225	default:
226	ACPI_DEBUG_PRINT((ACPI_DB_WARN, "EC SMBus adapter: "
227	"Unsupported transaction %d\n", size));
228	return (-1);
229	}
230
231	acpi_ec_smb_write(smbus, ACPI_EC_SMB_ADDR, addr << 1);
232	acpi_ec_smb_write(smbus, ACPI_EC_SMB_PRTCL, protocol);
233
234	acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
235
236	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
237	xudelay(500);
238	acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
239	}
240	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
241	xmsleep(ACPI_EC_SMB_ACCESS_SLEEP2);
242	acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
243	}
244	if ((~temp[0] & ACPI_EC_SMB_STS_DONE)
245	\|\| (temp[0] & ACPI_EC_SMB_STS_STATUS)) {
246	return (-1);
247	}
248
249	if (read_write == I2C_SMBUS_WRITE) {
250	return (0);
251	}
252
253	switch (size) {
254
255	case I2C_SMBUS_BYTE:
256	case I2C_SMBUS_BYTE_DATA:
257	acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, &data->byte);
258	break;
259
260	case I2C_SMBUS_WORD_DATA:
261	case I2C_SMBUS_PROC_CALL:
262	acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, temp + 0);
263	acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + 1, temp + 1);
264	data->word = (temp[1] << 8) \| temp[0];
265	break;
266
267	case I2C_SMBUS_BLOCK_DATA:
268	case I2C_SMBUS_BLOCK_PROC_CALL:
269	len = 0;
270	acpi_ec_smb_read(smbus, ACPI_EC_SMB_BCNT, &len);
271	len = min_t(u8, len, 32);
272	case I2C_SMBUS_I2C_BLOCK_DATA:
273	for (i = 0; i < len; i++)
274	acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + i,
275	data->block + i + 1);
276	data->block[0] = len;
277	break;
278	}
279
280	return (0);
281	}
282
283	static u32 acpi_ec_smb_func(struct i2c_adapter *adapter)
284	{
3f86b832 RT	285
	286	return (I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	287	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	288	I2C_FUNC_SMBUS_BLOCK_DATA \|
	289	I2C_FUNC_SMBUS_PROC_CALL \|
	290	I2C_FUNC_SMBUS_BLOCK_PROC_CALL \|
	291	I2C_FUNC_SMBUS_I2C_BLOCK \| I2C_FUNC_SMBUS_HWPEC_CALC);
	292	}
	293
8f9082c5	294	static const struct i2c_algorithm acpi_ec_smbus_algorithm = {
3f86b832 RT	295	.smbus_xfer = acpi_ec_smb_access,
	296	.functionality = acpi_ec_smb_func,
	297	};
	298
	299	static int acpi_ec_hc_add(struct acpi_device *device)
	300	{
	301	int status;
	302	unsigned long val;
	303	struct acpi_ec_hc *ec_hc;
	304	struct acpi_ec_smbus *smbus;
	305
3f86b832	306	if (!device) {
635227ee	307	return -EINVAL;
3f86b832 RT	308	}
3f86b832 RT	309
36bcbec7	310	ec_hc = kzalloc(sizeof(struct acpi_ec_hc), GFP_KERNEL);
3f86b832	311	if (!ec_hc) {
635227ee	312	return -ENOMEM;
3f86b832	313	}
3f86b832	314
36bcbec7	315	smbus = kzalloc(sizeof(struct acpi_ec_smbus), GFP_KERNEL);
3f86b832 RT	316	if (!smbus) {
3f86b832 RT	317	kfree(ec_hc);
635227ee	318	return -ENOMEM;
3f86b832	319	}
3f86b832 RT	320
	321	ec_hc->handle = device->handle;
	322	strcpy(acpi_device_name(device), ACPI_EC_HC_DEVICE_NAME);
	323	strcpy(acpi_device_class(device), ACPI_EC_HC_CLASS);
	324	acpi_driver_data(device) = ec_hc;
	325
	326	status = acpi_evaluate_integer(ec_hc->handle, "_EC", NULL, &val);
	327	if (ACPI_FAILURE(status)) {
	328	ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error obtaining _EC\n"));
0ee6a173	329	kfree(ec_hc);
3f86b832	330	kfree(smbus);
635227ee	331	return -EIO;
3f86b832 RT	332	}
	333
	334	smbus->ec = acpi_driver_data(device->parent);
	335	smbus->base = (val & 0xff00ull) >> 8;
	336	smbus->alert = val & 0xffull;
	337
	338	smbus->adapter.owner = THIS_MODULE;
	339	smbus->adapter.algo = &acpi_ec_smbus_algorithm;
	340	smbus->adapter.algo_data = smbus;
12a917f6	341	smbus->adapter.dev.parent = &device->dev;
3f86b832 RT	342
	343	if (i2c_add_adapter(&smbus->adapter)) {
	344	ACPI_DEBUG_PRINT((ACPI_DB_WARN,
	345	"EC SMBus adapter: Failed to register adapter\n"));
	346	kfree(smbus);
	347	kfree(ec_hc);
635227ee	348	return -EIO;
3f86b832 RT	349	}
	350
	351	ec_hc->smbus = smbus;
	352
	353	printk(KERN_INFO PREFIX "%s [%s]\n",
	354	acpi_device_name(device), acpi_device_bid(device));
	355
635227ee	356	return AE_OK;
3f86b832 RT	357	}
	358
	359	static int acpi_ec_hc_remove(struct acpi_device *device, int type)
	360	{
	361	struct acpi_ec_hc *ec_hc;
	362
3f86b832	363	if (!device) {
635227ee	364	return -EINVAL;
3f86b832 RT	365	}
	366	ec_hc = acpi_driver_data(device);
	367
	368	i2c_del_adapter(&ec_hc->smbus->adapter);
	369	kfree(ec_hc->smbus);
	370	kfree(ec_hc);
	371
635227ee	372	return AE_OK;
3f86b832 RT	373	}
	374
	375	static int __init acpi_ec_hc_init(void)
	376	{
	377	int result;
	378
3f86b832 RT	379	result = acpi_bus_register_driver(&acpi_ec_hc_driver);
3f86b832 RT	380	if (result < 0) {
635227ee	381	return -ENODEV;
3f86b832	382	}
635227ee	383	return 0;
3f86b832 RT	384	}
	385
	386	static void __exit acpi_ec_hc_exit(void)
	387	{
3f86b832 RT	388	acpi_bus_unregister_driver(&acpi_ec_hc_driver);
	389	}
	390
	391	struct acpi_ec_hc acpi_get_ec_hc(struct acpi_device device)
	392	{
50dd0969	393	return acpi_driver_data(device->parent);
3f86b832 RT	394	}
	395
	396	EXPORT_SYMBOL(acpi_get_ec_hc);
	397
	398	module_init(acpi_ec_hc_init);
	399	module_exit(acpi_ec_hc_exit);
	400
	401	MODULE_LICENSE("GPL");
	402	MODULE_AUTHOR("Ducrot Bruno");
	403	MODULE_DESCRIPTION("ACPI EC SMBus driver");