--- /dev/null
+/*
+ * 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/sched.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_DRIVER_NAME "ACPI EC HC smbus driver"
+#define ACPI_EC_HC_DEVICE_NAME "EC HC smbus"
+
+#define _COMPONENT ACPI_EC_HC_COMPONENT
+
+ACPI_MODULE_NAME("acpi_smbus")
+
+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 = ACPI_EC_HC_DRIVER_NAME,
+ .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 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 = kmalloc(sizeof(struct acpi_ec_hc), GFP_KERNEL);
+ if (!ec_hc) {
+ return -ENOMEM;
+ }
+ memset(ec_hc, 0, sizeof(struct acpi_ec_hc));
+
+ smbus = kmalloc(sizeof(struct acpi_ec_smbus), GFP_KERNEL);
+ if (!smbus) {
+ kfree(ec_hc);
+ return -ENOMEM;
+ }
+ memset(smbus, 0, sizeof(struct acpi_ec_smbus));
+
+ 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;
+
+ 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 ((struct acpi_ec_hc *)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");
git://git.onelab.eu / linux-2.6.git / blobdiff