405 lines
10 KiB
C
405 lines
10 KiB
C
/*
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* SMBus driver for ACPI Embedded Controller ($Revision: 1.3 $)
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*
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* Copyright (c) 2002, 2005 Ducrot Bruno
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* Copyright (c) 2005 Rich Townsend (tiny hacks & tweaks)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2.
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include "i2c_ec.h"
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#define xudelay(t) udelay(t)
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#define xmsleep(t) msleep(t)
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#define ACPI_EC_HC_COMPONENT 0x00080000
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#define ACPI_EC_HC_CLASS "ec_hc_smbus"
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#define ACPI_EC_HC_HID "ACPI0001"
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#define ACPI_EC_HC_DRIVER_NAME "ACPI EC HC smbus driver"
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#define ACPI_EC_HC_DEVICE_NAME "EC HC smbus"
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#define _COMPONENT ACPI_EC_HC_COMPONENT
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ACPI_MODULE_NAME("acpi_smbus")
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static int acpi_ec_hc_add(struct acpi_device *device);
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static int acpi_ec_hc_remove(struct acpi_device *device, int type);
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static struct acpi_driver acpi_ec_hc_driver = {
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.name = ACPI_EC_HC_DRIVER_NAME,
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.class = ACPI_EC_HC_CLASS,
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.ids = ACPI_EC_HC_HID,
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.ops = {
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.add = acpi_ec_hc_add,
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.remove = acpi_ec_hc_remove,
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},
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};
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/* Various bit mask for EC_SC (R) */
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#define OBF 0x01
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#define IBF 0x02
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#define CMD 0x08
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#define BURST 0x10
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#define SCI_EVT 0x20
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#define SMI_EVT 0x40
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/* Commands for EC_SC (W) */
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#define RD_EC 0x80
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#define WR_EC 0x81
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#define BE_EC 0x82
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#define BD_EC 0x83
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#define QR_EC 0x84
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/*
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* ACPI 2.0 chapter 13 SMBus 2.0 EC register model
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*/
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#define ACPI_EC_SMB_PRTCL 0x00 /* protocol, PEC */
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#define ACPI_EC_SMB_STS 0x01 /* status */
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#define ACPI_EC_SMB_ADDR 0x02 /* address */
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#define ACPI_EC_SMB_CMD 0x03 /* command */
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#define ACPI_EC_SMB_DATA 0x04 /* 32 data registers */
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#define ACPI_EC_SMB_BCNT 0x24 /* number of data bytes */
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#define ACPI_EC_SMB_ALRM_A 0x25 /* alarm address */
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#define ACPI_EC_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
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#define ACPI_EC_SMB_STS_DONE 0x80
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#define ACPI_EC_SMB_STS_ALRM 0x40
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#define ACPI_EC_SMB_STS_RES 0x20
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#define ACPI_EC_SMB_STS_STATUS 0x1f
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#define ACPI_EC_SMB_STATUS_OK 0x00
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#define ACPI_EC_SMB_STATUS_FAIL 0x07
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#define ACPI_EC_SMB_STATUS_DNAK 0x10
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#define ACPI_EC_SMB_STATUS_DERR 0x11
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#define ACPI_EC_SMB_STATUS_CMD_DENY 0x12
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#define ACPI_EC_SMB_STATUS_UNKNOWN 0x13
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#define ACPI_EC_SMB_STATUS_ACC_DENY 0x17
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#define ACPI_EC_SMB_STATUS_TIMEOUT 0x18
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#define ACPI_EC_SMB_STATUS_NOTSUP 0x19
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#define ACPI_EC_SMB_STATUS_BUSY 0x1A
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#define ACPI_EC_SMB_STATUS_PEC 0x1F
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#define ACPI_EC_SMB_PRTCL_WRITE 0x00
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#define ACPI_EC_SMB_PRTCL_READ 0x01
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#define ACPI_EC_SMB_PRTCL_QUICK 0x02
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#define ACPI_EC_SMB_PRTCL_BYTE 0x04
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#define ACPI_EC_SMB_PRTCL_BYTE_DATA 0x06
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#define ACPI_EC_SMB_PRTCL_WORD_DATA 0x08
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#define ACPI_EC_SMB_PRTCL_BLOCK_DATA 0x0a
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#define ACPI_EC_SMB_PRTCL_PROC_CALL 0x0c
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#define ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
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#define ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
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#define ACPI_EC_SMB_PRTCL_PEC 0x80
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/* Length of pre/post transaction sleep (msec) */
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#define ACPI_EC_SMB_TRANSACTION_SLEEP 1
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#define ACPI_EC_SMB_ACCESS_SLEEP1 1
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#define ACPI_EC_SMB_ACCESS_SLEEP2 10
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static int acpi_ec_smb_read(struct acpi_ec_smbus *smbus, u8 address, u8 * data)
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{
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u8 val;
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int err;
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err = ec_read(smbus->base + address, &val);
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if (!err) {
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*data = val;
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}
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xmsleep(ACPI_EC_SMB_TRANSACTION_SLEEP);
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return (err);
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}
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static int acpi_ec_smb_write(struct acpi_ec_smbus *smbus, u8 address, u8 data)
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{
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int err;
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err = ec_write(smbus->base + address, data);
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return (err);
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}
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static int
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acpi_ec_smb_access(struct i2c_adapter *adap, u16 addr, unsigned short flags,
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char read_write, u8 command, int size,
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union i2c_smbus_data *data)
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{
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struct acpi_ec_smbus *smbus = adap->algo_data;
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unsigned char protocol, len = 0, pec, temp[2] = { 0, 0 };
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int i;
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if (read_write == I2C_SMBUS_READ) {
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protocol = ACPI_EC_SMB_PRTCL_READ;
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} else {
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protocol = ACPI_EC_SMB_PRTCL_WRITE;
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}
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pec = (flags & I2C_CLIENT_PEC) ? ACPI_EC_SMB_PRTCL_PEC : 0;
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switch (size) {
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case I2C_SMBUS_QUICK:
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protocol |= ACPI_EC_SMB_PRTCL_QUICK;
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read_write = I2C_SMBUS_WRITE;
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break;
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_WRITE) {
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
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}
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protocol |= ACPI_EC_SMB_PRTCL_BYTE;
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break;
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case I2C_SMBUS_BYTE_DATA:
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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if (read_write == I2C_SMBUS_WRITE) {
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->byte);
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}
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protocol |= ACPI_EC_SMB_PRTCL_BYTE_DATA;
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break;
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case I2C_SMBUS_WORD_DATA:
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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if (read_write == I2C_SMBUS_WRITE) {
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1,
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data->word >> 8);
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}
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protocol |= ACPI_EC_SMB_PRTCL_WORD_DATA | pec;
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break;
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case I2C_SMBUS_BLOCK_DATA:
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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if (read_write == I2C_SMBUS_WRITE) {
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len = min_t(u8, data->block[0], 32);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
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for (i = 0; i < len; i++)
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
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data->block[i + 1]);
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}
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protocol |= ACPI_EC_SMB_PRTCL_BLOCK_DATA | pec;
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break;
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case I2C_SMBUS_I2C_BLOCK_DATA:
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len = min_t(u8, data->block[0], 32);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
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if (read_write == I2C_SMBUS_WRITE) {
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for (i = 0; i < len; i++) {
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
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data->block[i + 1]);
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}
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}
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protocol |= ACPI_EC_SMB_PRTCL_I2C_BLOCK_DATA;
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break;
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case I2C_SMBUS_PROC_CALL:
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA, data->word);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + 1, data->word >> 8);
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protocol = ACPI_EC_SMB_PRTCL_PROC_CALL | pec;
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read_write = I2C_SMBUS_READ;
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break;
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case I2C_SMBUS_BLOCK_PROC_CALL:
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protocol |= pec;
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len = min_t(u8, data->block[0], 31);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_CMD, command);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_BCNT, len);
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for (i = 0; i < len; i++)
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_DATA + i,
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data->block[i + 1]);
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protocol = ACPI_EC_SMB_PRTCL_BLOCK_PROC_CALL | pec;
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read_write = I2C_SMBUS_READ;
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "EC SMBus adapter: "
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"Unsupported transaction %d\n", size));
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return (-1);
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}
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_ADDR, addr << 1);
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acpi_ec_smb_write(smbus, ACPI_EC_SMB_PRTCL, protocol);
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
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if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
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xudelay(500);
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
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}
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if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
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xmsleep(ACPI_EC_SMB_ACCESS_SLEEP2);
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_STS, temp + 0);
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}
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if ((~temp[0] & ACPI_EC_SMB_STS_DONE)
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|| (temp[0] & ACPI_EC_SMB_STS_STATUS)) {
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return (-1);
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}
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if (read_write == I2C_SMBUS_WRITE) {
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return (0);
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}
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switch (size) {
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_BYTE_DATA:
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, &data->byte);
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break;
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case I2C_SMBUS_WORD_DATA:
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case I2C_SMBUS_PROC_CALL:
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA, temp + 0);
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + 1, temp + 1);
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data->word = (temp[1] << 8) | temp[0];
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break;
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case I2C_SMBUS_BLOCK_DATA:
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case I2C_SMBUS_BLOCK_PROC_CALL:
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len = 0;
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_BCNT, &len);
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len = min_t(u8, len, 32);
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case I2C_SMBUS_I2C_BLOCK_DATA:
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for (i = 0; i < len; i++)
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acpi_ec_smb_read(smbus, ACPI_EC_SMB_DATA + i,
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data->block + i + 1);
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data->block[0] = len;
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break;
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}
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return (0);
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}
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static u32 acpi_ec_smb_func(struct i2c_adapter *adapter)
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{
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return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA |
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I2C_FUNC_SMBUS_PROC_CALL |
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I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
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I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_HWPEC_CALC);
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}
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static const struct i2c_algorithm acpi_ec_smbus_algorithm = {
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.smbus_xfer = acpi_ec_smb_access,
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.functionality = acpi_ec_smb_func,
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};
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static int acpi_ec_hc_add(struct acpi_device *device)
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{
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int status;
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unsigned long val;
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struct acpi_ec_hc *ec_hc;
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struct acpi_ec_smbus *smbus;
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if (!device) {
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return -EINVAL;
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}
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ec_hc = kzalloc(sizeof(struct acpi_ec_hc), GFP_KERNEL);
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if (!ec_hc) {
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return -ENOMEM;
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}
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smbus = kzalloc(sizeof(struct acpi_ec_smbus), GFP_KERNEL);
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if (!smbus) {
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kfree(ec_hc);
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return -ENOMEM;
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}
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ec_hc->handle = device->handle;
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strcpy(acpi_device_name(device), ACPI_EC_HC_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_EC_HC_CLASS);
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acpi_driver_data(device) = ec_hc;
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status = acpi_evaluate_integer(ec_hc->handle, "_EC", NULL, &val);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error obtaining _EC\n"));
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kfree(ec_hc);
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kfree(smbus);
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return -EIO;
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}
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smbus->ec = acpi_driver_data(device->parent);
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smbus->base = (val & 0xff00ull) >> 8;
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smbus->alert = val & 0xffull;
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smbus->adapter.owner = THIS_MODULE;
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smbus->adapter.algo = &acpi_ec_smbus_algorithm;
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smbus->adapter.algo_data = smbus;
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if (i2c_add_adapter(&smbus->adapter)) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"EC SMBus adapter: Failed to register adapter\n"));
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kfree(smbus);
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kfree(ec_hc);
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return -EIO;
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}
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ec_hc->smbus = smbus;
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printk(KERN_INFO PREFIX "%s [%s]\n",
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acpi_device_name(device), acpi_device_bid(device));
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return AE_OK;
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}
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static int acpi_ec_hc_remove(struct acpi_device *device, int type)
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{
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struct acpi_ec_hc *ec_hc;
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if (!device) {
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return -EINVAL;
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}
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ec_hc = acpi_driver_data(device);
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i2c_del_adapter(&ec_hc->smbus->adapter);
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kfree(ec_hc->smbus);
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kfree(ec_hc);
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return AE_OK;
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}
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static int __init acpi_ec_hc_init(void)
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{
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int result;
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result = acpi_bus_register_driver(&acpi_ec_hc_driver);
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if (result < 0) {
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return -ENODEV;
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}
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return 0;
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}
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static void __exit acpi_ec_hc_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_ec_hc_driver);
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}
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struct acpi_ec_hc *acpi_get_ec_hc(struct acpi_device *device)
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{
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return acpi_driver_data(device->parent);
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}
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EXPORT_SYMBOL(acpi_get_ec_hc);
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module_init(acpi_ec_hc_init);
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module_exit(acpi_ec_hc_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ducrot Bruno");
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MODULE_DESCRIPTION("ACPI EC SMBus driver");
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