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![Rafael J. Wysocki](/assets/img/avatar_default.png)
The second argument of ACPI driver .remove() operation is only used by the ACPI processor driver and the value passed to that driver through it is always available from the given struct acpi_device object's removal_type field. For this reason, the second ACPI driver .remove() argument is in fact useless, so drop it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Yinghai Lu <yinghai@kernel.org>
317 lines
7.6 KiB
C
317 lines
7.6 KiB
C
/*
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* SMBus driver for ACPI Embedded Controller (v0.1)
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*
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* Copyright (c) 2007 Alexey Starikovskiy
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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 <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include "sbshc.h"
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#define PREFIX "ACPI: "
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#define ACPI_SMB_HC_CLASS "smbus_host_ctl"
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#define ACPI_SMB_HC_DEVICE_NAME "ACPI SMBus HC"
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struct acpi_smb_hc {
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struct acpi_ec *ec;
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struct mutex lock;
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wait_queue_head_t wait;
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u8 offset;
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u8 query_bit;
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smbus_alarm_callback callback;
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void *context;
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};
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static int acpi_smbus_hc_add(struct acpi_device *device);
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static int acpi_smbus_hc_remove(struct acpi_device *device);
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static const struct acpi_device_id sbs_device_ids[] = {
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{"ACPI0001", 0},
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{"ACPI0005", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
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static struct acpi_driver acpi_smb_hc_driver = {
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.name = "smbus_hc",
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.class = ACPI_SMB_HC_CLASS,
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.ids = sbs_device_ids,
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.ops = {
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.add = acpi_smbus_hc_add,
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.remove = acpi_smbus_hc_remove,
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},
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};
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union acpi_smb_status {
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u8 raw;
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struct {
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u8 status:5;
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u8 reserved:1;
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u8 alarm:1;
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u8 done:1;
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} fields;
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};
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enum acpi_smb_status_codes {
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SMBUS_OK = 0,
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SMBUS_UNKNOWN_FAILURE = 0x07,
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SMBUS_DEVICE_ADDRESS_NACK = 0x10,
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SMBUS_DEVICE_ERROR = 0x11,
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SMBUS_DEVICE_COMMAND_ACCESS_DENIED = 0x12,
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SMBUS_UNKNOWN_ERROR = 0x13,
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SMBUS_DEVICE_ACCESS_DENIED = 0x17,
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SMBUS_TIMEOUT = 0x18,
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SMBUS_HOST_UNSUPPORTED_PROTOCOL = 0x19,
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SMBUS_BUSY = 0x1a,
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SMBUS_PEC_ERROR = 0x1f,
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};
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enum acpi_smb_offset {
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ACPI_SMB_PROTOCOL = 0, /* protocol, PEC */
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ACPI_SMB_STATUS = 1, /* status */
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ACPI_SMB_ADDRESS = 2, /* address */
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ACPI_SMB_COMMAND = 3, /* command */
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ACPI_SMB_DATA = 4, /* 32 data registers */
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ACPI_SMB_BLOCK_COUNT = 0x24, /* number of data bytes */
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ACPI_SMB_ALARM_ADDRESS = 0x25, /* alarm address */
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ACPI_SMB_ALARM_DATA = 0x26, /* 2 bytes alarm data */
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};
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static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)
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{
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return ec_read(hc->offset + address, data);
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}
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static inline int smb_hc_write(struct acpi_smb_hc *hc, u8 address, u8 data)
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{
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return ec_write(hc->offset + address, data);
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}
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static inline int smb_check_done(struct acpi_smb_hc *hc)
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{
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union acpi_smb_status status = {.raw = 0};
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smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw);
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return status.fields.done && (status.fields.status == SMBUS_OK);
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}
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static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
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{
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if (wait_event_timeout(hc->wait, smb_check_done(hc),
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msecs_to_jiffies(timeout)))
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return 0;
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/*
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* After the timeout happens, OS will try to check the status of SMbus.
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* If the status is what OS expected, it will be regarded as the bogus
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* timeout.
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*/
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if (smb_check_done(hc))
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return 0;
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else
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return -ETIME;
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}
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static int acpi_smbus_transaction(struct acpi_smb_hc *hc, u8 protocol,
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u8 address, u8 command, u8 *data, u8 length)
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{
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int ret = -EFAULT, i;
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u8 temp, sz = 0;
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if (!hc) {
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printk(KERN_ERR PREFIX "host controller is not configured\n");
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return ret;
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}
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mutex_lock(&hc->lock);
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if (smb_hc_read(hc, ACPI_SMB_PROTOCOL, &temp))
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goto end;
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if (temp) {
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ret = -EBUSY;
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goto end;
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}
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smb_hc_write(hc, ACPI_SMB_COMMAND, command);
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if (!(protocol & 0x01)) {
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smb_hc_write(hc, ACPI_SMB_BLOCK_COUNT, length);
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for (i = 0; i < length; ++i)
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smb_hc_write(hc, ACPI_SMB_DATA + i, data[i]);
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}
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smb_hc_write(hc, ACPI_SMB_ADDRESS, address << 1);
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smb_hc_write(hc, ACPI_SMB_PROTOCOL, protocol);
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/*
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* Wait for completion. Save the status code, data size,
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* and data into the return package (if required by the protocol).
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*/
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ret = wait_transaction_complete(hc, 1000);
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if (ret || !(protocol & 0x01))
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goto end;
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switch (protocol) {
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case SMBUS_RECEIVE_BYTE:
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case SMBUS_READ_BYTE:
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sz = 1;
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break;
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case SMBUS_READ_WORD:
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sz = 2;
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break;
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case SMBUS_READ_BLOCK:
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if (smb_hc_read(hc, ACPI_SMB_BLOCK_COUNT, &sz)) {
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ret = -EFAULT;
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goto end;
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}
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sz &= 0x1f;
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break;
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}
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for (i = 0; i < sz; ++i)
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smb_hc_read(hc, ACPI_SMB_DATA + i, &data[i]);
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end:
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mutex_unlock(&hc->lock);
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return ret;
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}
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int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,
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u8 command, u8 *data)
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{
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return acpi_smbus_transaction(hc, protocol, address, command, data, 0);
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}
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EXPORT_SYMBOL_GPL(acpi_smbus_read);
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int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 address,
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u8 command, u8 *data, u8 length)
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{
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return acpi_smbus_transaction(hc, protocol, address, command, data, length);
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}
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EXPORT_SYMBOL_GPL(acpi_smbus_write);
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int acpi_smbus_register_callback(struct acpi_smb_hc *hc,
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smbus_alarm_callback callback, void *context)
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{
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mutex_lock(&hc->lock);
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hc->callback = callback;
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hc->context = context;
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mutex_unlock(&hc->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_smbus_register_callback);
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int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc)
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{
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mutex_lock(&hc->lock);
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hc->callback = NULL;
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hc->context = NULL;
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mutex_unlock(&hc->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_smbus_unregister_callback);
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static inline void acpi_smbus_callback(void *context)
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{
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struct acpi_smb_hc *hc = context;
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if (hc->callback)
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hc->callback(hc->context);
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}
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static int smbus_alarm(void *context)
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{
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struct acpi_smb_hc *hc = context;
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union acpi_smb_status status;
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u8 address;
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if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
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return 0;
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/* Check if it is only a completion notify */
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if (status.fields.done)
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wake_up(&hc->wait);
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if (!status.fields.alarm)
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return 0;
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mutex_lock(&hc->lock);
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smb_hc_read(hc, ACPI_SMB_ALARM_ADDRESS, &address);
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status.fields.alarm = 0;
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smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
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/* We are only interested in events coming from known devices */
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switch (address >> 1) {
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case ACPI_SBS_CHARGER:
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case ACPI_SBS_MANAGER:
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case ACPI_SBS_BATTERY:
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acpi_os_execute(OSL_NOTIFY_HANDLER,
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acpi_smbus_callback, hc);
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default:;
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}
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mutex_unlock(&hc->lock);
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return 0;
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}
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typedef int (*acpi_ec_query_func) (void *data);
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extern int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
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acpi_handle handle, acpi_ec_query_func func,
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void *data);
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static int acpi_smbus_hc_add(struct acpi_device *device)
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{
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int status;
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unsigned long long val;
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struct acpi_smb_hc *hc;
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if (!device)
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return -EINVAL;
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status = acpi_evaluate_integer(device->handle, "_EC", NULL, &val);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX "error obtaining _EC.\n");
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return -EIO;
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}
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strcpy(acpi_device_name(device), ACPI_SMB_HC_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_SMB_HC_CLASS);
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hc = kzalloc(sizeof(struct acpi_smb_hc), GFP_KERNEL);
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if (!hc)
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return -ENOMEM;
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mutex_init(&hc->lock);
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init_waitqueue_head(&hc->wait);
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hc->ec = acpi_driver_data(device->parent);
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hc->offset = (val >> 8) & 0xff;
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hc->query_bit = val & 0xff;
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device->driver_data = hc;
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acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);
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printk(KERN_INFO PREFIX "SBS HC: EC = 0x%p, offset = 0x%0x, query_bit = 0x%0x\n",
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hc->ec, hc->offset, hc->query_bit);
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return 0;
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}
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extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
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static int acpi_smbus_hc_remove(struct acpi_device *device)
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{
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struct acpi_smb_hc *hc;
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if (!device)
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return -EINVAL;
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hc = acpi_driver_data(device);
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acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
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kfree(hc);
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device->driver_data = NULL;
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return 0;
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}
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module_acpi_driver(acpi_smb_hc_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexey Starikovskiy");
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MODULE_DESCRIPTION("ACPI SMBus HC driver");
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