Merge branch 'master' of /home/trondmy/kernel/linux-2.6/

1 files changed, 406 insertions, 0 deletions

diff --git a/drivers/acpi/i2c_ec.c b/drivers/acpi/i2c_ec.c
new file mode 100644
index 000000000000..84239d51dc0c
--- /dev/null
+++ b/drivers/acpi/i2c_ec.c
@@ -0,0 +1,406 @@
+/*
+ * 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->smbus);
+                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");