mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 135 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531081036.435762997@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
303 lines
7.1 KiB
C
303 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* SMBus driver for ACPI Embedded Controller (v0.1)
|
|
*
|
|
* Copyright (c) 2007 Alexey Starikovskiy
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include "sbshc.h"
|
|
|
|
#define PREFIX "ACPI: "
|
|
|
|
#define ACPI_SMB_HC_CLASS "smbus_host_ctl"
|
|
#define ACPI_SMB_HC_DEVICE_NAME "ACPI SMBus HC"
|
|
|
|
struct acpi_smb_hc {
|
|
struct acpi_ec *ec;
|
|
struct mutex lock;
|
|
wait_queue_head_t wait;
|
|
u8 offset;
|
|
u8 query_bit;
|
|
smbus_alarm_callback callback;
|
|
void *context;
|
|
bool done;
|
|
};
|
|
|
|
static int acpi_smbus_hc_add(struct acpi_device *device);
|
|
static int acpi_smbus_hc_remove(struct acpi_device *device);
|
|
|
|
static const struct acpi_device_id sbs_device_ids[] = {
|
|
{"ACPI0001", 0},
|
|
{"ACPI0005", 0},
|
|
{"", 0},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
|
|
|
|
static struct acpi_driver acpi_smb_hc_driver = {
|
|
.name = "smbus_hc",
|
|
.class = ACPI_SMB_HC_CLASS,
|
|
.ids = sbs_device_ids,
|
|
.ops = {
|
|
.add = acpi_smbus_hc_add,
|
|
.remove = acpi_smbus_hc_remove,
|
|
},
|
|
};
|
|
|
|
union acpi_smb_status {
|
|
u8 raw;
|
|
struct {
|
|
u8 status:5;
|
|
u8 reserved:1;
|
|
u8 alarm:1;
|
|
u8 done:1;
|
|
} fields;
|
|
};
|
|
|
|
enum acpi_smb_status_codes {
|
|
SMBUS_OK = 0,
|
|
SMBUS_UNKNOWN_FAILURE = 0x07,
|
|
SMBUS_DEVICE_ADDRESS_NACK = 0x10,
|
|
SMBUS_DEVICE_ERROR = 0x11,
|
|
SMBUS_DEVICE_COMMAND_ACCESS_DENIED = 0x12,
|
|
SMBUS_UNKNOWN_ERROR = 0x13,
|
|
SMBUS_DEVICE_ACCESS_DENIED = 0x17,
|
|
SMBUS_TIMEOUT = 0x18,
|
|
SMBUS_HOST_UNSUPPORTED_PROTOCOL = 0x19,
|
|
SMBUS_BUSY = 0x1a,
|
|
SMBUS_PEC_ERROR = 0x1f,
|
|
};
|
|
|
|
enum acpi_smb_offset {
|
|
ACPI_SMB_PROTOCOL = 0, /* protocol, PEC */
|
|
ACPI_SMB_STATUS = 1, /* status */
|
|
ACPI_SMB_ADDRESS = 2, /* address */
|
|
ACPI_SMB_COMMAND = 3, /* command */
|
|
ACPI_SMB_DATA = 4, /* 32 data registers */
|
|
ACPI_SMB_BLOCK_COUNT = 0x24, /* number of data bytes */
|
|
ACPI_SMB_ALARM_ADDRESS = 0x25, /* alarm address */
|
|
ACPI_SMB_ALARM_DATA = 0x26, /* 2 bytes alarm data */
|
|
};
|
|
|
|
static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)
|
|
{
|
|
return ec_read(hc->offset + address, data);
|
|
}
|
|
|
|
static inline int smb_hc_write(struct acpi_smb_hc *hc, u8 address, u8 data)
|
|
{
|
|
return ec_write(hc->offset + address, data);
|
|
}
|
|
|
|
static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
|
|
{
|
|
if (wait_event_timeout(hc->wait, hc->done, msecs_to_jiffies(timeout)))
|
|
return 0;
|
|
return -ETIME;
|
|
}
|
|
|
|
static int acpi_smbus_transaction(struct acpi_smb_hc *hc, u8 protocol,
|
|
u8 address, u8 command, u8 *data, u8 length)
|
|
{
|
|
int ret = -EFAULT, i;
|
|
u8 temp, sz = 0;
|
|
|
|
if (!hc) {
|
|
printk(KERN_ERR PREFIX "host controller is not configured\n");
|
|
return ret;
|
|
}
|
|
|
|
mutex_lock(&hc->lock);
|
|
hc->done = false;
|
|
if (smb_hc_read(hc, ACPI_SMB_PROTOCOL, &temp))
|
|
goto end;
|
|
if (temp) {
|
|
ret = -EBUSY;
|
|
goto end;
|
|
}
|
|
smb_hc_write(hc, ACPI_SMB_COMMAND, command);
|
|
if (!(protocol & 0x01)) {
|
|
smb_hc_write(hc, ACPI_SMB_BLOCK_COUNT, length);
|
|
for (i = 0; i < length; ++i)
|
|
smb_hc_write(hc, ACPI_SMB_DATA + i, data[i]);
|
|
}
|
|
smb_hc_write(hc, ACPI_SMB_ADDRESS, address << 1);
|
|
smb_hc_write(hc, ACPI_SMB_PROTOCOL, protocol);
|
|
/*
|
|
* Wait for completion. Save the status code, data size,
|
|
* and data into the return package (if required by the protocol).
|
|
*/
|
|
ret = wait_transaction_complete(hc, 1000);
|
|
if (ret || !(protocol & 0x01))
|
|
goto end;
|
|
switch (protocol) {
|
|
case SMBUS_RECEIVE_BYTE:
|
|
case SMBUS_READ_BYTE:
|
|
sz = 1;
|
|
break;
|
|
case SMBUS_READ_WORD:
|
|
sz = 2;
|
|
break;
|
|
case SMBUS_READ_BLOCK:
|
|
if (smb_hc_read(hc, ACPI_SMB_BLOCK_COUNT, &sz)) {
|
|
ret = -EFAULT;
|
|
goto end;
|
|
}
|
|
sz &= 0x1f;
|
|
break;
|
|
}
|
|
for (i = 0; i < sz; ++i)
|
|
smb_hc_read(hc, ACPI_SMB_DATA + i, &data[i]);
|
|
end:
|
|
mutex_unlock(&hc->lock);
|
|
return ret;
|
|
}
|
|
|
|
int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,
|
|
u8 command, u8 *data)
|
|
{
|
|
return acpi_smbus_transaction(hc, protocol, address, command, data, 0);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(acpi_smbus_read);
|
|
|
|
int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 address,
|
|
u8 command, u8 *data, u8 length)
|
|
{
|
|
return acpi_smbus_transaction(hc, protocol, address, command, data, length);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(acpi_smbus_write);
|
|
|
|
int acpi_smbus_register_callback(struct acpi_smb_hc *hc,
|
|
smbus_alarm_callback callback, void *context)
|
|
{
|
|
mutex_lock(&hc->lock);
|
|
hc->callback = callback;
|
|
hc->context = context;
|
|
mutex_unlock(&hc->lock);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(acpi_smbus_register_callback);
|
|
|
|
int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc)
|
|
{
|
|
mutex_lock(&hc->lock);
|
|
hc->callback = NULL;
|
|
hc->context = NULL;
|
|
mutex_unlock(&hc->lock);
|
|
acpi_os_wait_events_complete();
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(acpi_smbus_unregister_callback);
|
|
|
|
static inline void acpi_smbus_callback(void *context)
|
|
{
|
|
struct acpi_smb_hc *hc = context;
|
|
if (hc->callback)
|
|
hc->callback(hc->context);
|
|
}
|
|
|
|
static int smbus_alarm(void *context)
|
|
{
|
|
struct acpi_smb_hc *hc = context;
|
|
union acpi_smb_status status;
|
|
u8 address;
|
|
if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
|
|
return 0;
|
|
/* Check if it is only a completion notify */
|
|
if (status.fields.done && status.fields.status == SMBUS_OK) {
|
|
hc->done = true;
|
|
wake_up(&hc->wait);
|
|
}
|
|
if (!status.fields.alarm)
|
|
return 0;
|
|
mutex_lock(&hc->lock);
|
|
smb_hc_read(hc, ACPI_SMB_ALARM_ADDRESS, &address);
|
|
status.fields.alarm = 0;
|
|
smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
|
|
/* We are only interested in events coming from known devices */
|
|
switch (address >> 1) {
|
|
case ACPI_SBS_CHARGER:
|
|
case ACPI_SBS_MANAGER:
|
|
case ACPI_SBS_BATTERY:
|
|
acpi_os_execute(OSL_NOTIFY_HANDLER,
|
|
acpi_smbus_callback, hc);
|
|
default:;
|
|
}
|
|
mutex_unlock(&hc->lock);
|
|
return 0;
|
|
}
|
|
|
|
typedef int (*acpi_ec_query_func) (void *data);
|
|
|
|
extern int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
|
|
acpi_handle handle, acpi_ec_query_func func,
|
|
void *data);
|
|
|
|
static int acpi_smbus_hc_add(struct acpi_device *device)
|
|
{
|
|
int status;
|
|
unsigned long long val;
|
|
struct acpi_smb_hc *hc;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
status = acpi_evaluate_integer(device->handle, "_EC", NULL, &val);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "error obtaining _EC.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
strcpy(acpi_device_name(device), ACPI_SMB_HC_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_SMB_HC_CLASS);
|
|
|
|
hc = kzalloc(sizeof(struct acpi_smb_hc), GFP_KERNEL);
|
|
if (!hc)
|
|
return -ENOMEM;
|
|
mutex_init(&hc->lock);
|
|
init_waitqueue_head(&hc->wait);
|
|
|
|
hc->ec = acpi_driver_data(device->parent);
|
|
hc->offset = (val >> 8) & 0xff;
|
|
hc->query_bit = val & 0xff;
|
|
device->driver_data = hc;
|
|
|
|
acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);
|
|
dev_info(&device->dev, "SBS HC: offset = 0x%0x, query_bit = 0x%0x\n",
|
|
hc->offset, hc->query_bit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
|
|
|
|
static int acpi_smbus_hc_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_smb_hc *hc;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
hc = acpi_driver_data(device);
|
|
acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
|
|
acpi_os_wait_events_complete();
|
|
kfree(hc);
|
|
device->driver_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
module_acpi_driver(acpi_smb_hc_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Alexey Starikovskiy");
|
|
MODULE_DESCRIPTION("ACPI SMBus HC driver");
|