#include <linux/jiffies.h>
#include <linux/delay.h>
+#include "sbshc.h"
+
#define ACPI_SBS_COMPONENT 0x00080000
#define ACPI_SBS_CLASS "sbs"
#define ACPI_AC_CLASS "ac_adapter"
MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
MODULE_LICENSE("GPL");
-#define xmsleep(t) msleep(t)
-
-#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_STS_DONE 0x80
-#define ACPI_EC_SMB_STS_STATUS 0x1f
-
-#define ACPI_EC_SMB_PRTCL_WRITE 0x00
-#define ACPI_EC_SMB_PRTCL_READ 0x01
-#define ACPI_EC_SMB_PRTCL_WORD_DATA 0x08
-#define ACPI_EC_SMB_PRTCL_BLOCK_DATA 0x0a
-
-#define ACPI_EC_SMB_TRANSACTION_SLEEP 1
-#define ACPI_EC_SMB_ACCESS_SLEEP1 1
-#define ACPI_EC_SMB_ACCESS_SLEEP2 10
-
#define DEF_CAPACITY_UNIT 3
#define MAH_CAPACITY_UNIT 1
#define MWH_CAPACITY_UNIT 2
#define MAX_SBS_BAT 4
#define ACPI_SBS_BLOCK_MAX 32
-#define ACPI_SBS_SMBUS_READ 1
-#define ACPI_SBS_SMBUS_WRITE 2
-
-#define ACPI_SBS_WORD_DATA 1
-#define ACPI_SBS_BLOCK_DATA 2
-
#define UPDATE_DELAY 10
/* 0 - every time, > 0 - by update_time */
static int acpi_sbs_resume(struct acpi_device *device);
static const struct acpi_device_id sbs_device_ids[] = {
- {"ACPI0001", 0},
- {"ACPI0005", 0},
+ {"ACPI0002", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
};
struct acpi_sbs {
- int base;
struct acpi_device *device;
+ struct acpi_smb_hc *hc;
struct mutex mutex;
int sbsm_present;
int sbsm_batteries_supported;
static int acpi_sbs_update_run(struct acpi_sbs *sbs, int id, int data_type);
static void acpi_sbs_update_time(void *data);
-union sbs_rw_data {
- u16 word;
- u8 block[ACPI_SBS_BLOCK_MAX + 2];
-};
-
-static int acpi_ec_sbs_access(struct acpi_sbs *sbs, u16 addr,
- char read_write, u8 command, int size,
- union sbs_rw_data *data);
-
-/* --------------------------------------------------------------------------
- SMBus Communication
- -------------------------------------------------------------------------- */
-
-static int acpi_ec_sbs_read(struct acpi_sbs *sbs, u8 address, u8 * data)
-{
- u8 val;
- int err;
-
- err = ec_read(sbs->base + address, &val);
- if (!err) {
- *data = val;
- }
- xmsleep(ACPI_EC_SMB_TRANSACTION_SLEEP);
- return (err);
-}
-
-static int acpi_ec_sbs_write(struct acpi_sbs *sbs, u8 address, u8 data)
-{
- int err;
-
- err = ec_write(sbs->base + address, data);
- return (err);
-}
-
-static int
-acpi_ec_sbs_access(struct acpi_sbs *sbs, u16 addr,
- char read_write, u8 command, int size,
- union sbs_rw_data *data)
-{
- unsigned char protocol, len = 0, temp[2] = { 0, 0 };
- int i;
-
- if (read_write == ACPI_SBS_SMBUS_READ) {
- protocol = ACPI_EC_SMB_PRTCL_READ;
- } else {
- protocol = ACPI_EC_SMB_PRTCL_WRITE;
- }
-
- switch (size) {
-
- case ACPI_SBS_WORD_DATA:
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_CMD, command);
- if (read_write == ACPI_SBS_SMBUS_WRITE) {
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA, data->word);
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA + 1,
- data->word >> 8);
- }
- protocol |= ACPI_EC_SMB_PRTCL_WORD_DATA;
- break;
- case ACPI_SBS_BLOCK_DATA:
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_CMD, command);
- if (read_write == ACPI_SBS_SMBUS_WRITE) {
- len = min_t(u8, data->block[0], 32);
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_BCNT, len);
- for (i = 0; i < len; i++)
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA + i,
- data->block[i + 1]);
- }
- protocol |= ACPI_EC_SMB_PRTCL_BLOCK_DATA;
- break;
- default:
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "unsupported transaction %d", size));
- return (-1);
- }
-
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_ADDR, addr << 1);
- acpi_ec_sbs_write(sbs, ACPI_EC_SMB_PRTCL, protocol);
-
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
-
- if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
- xmsleep(ACPI_EC_SMB_ACCESS_SLEEP1);
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
- }
- if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
- xmsleep(ACPI_EC_SMB_ACCESS_SLEEP2);
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
- }
- if ((~temp[0] & ACPI_EC_SMB_STS_DONE)
- || (temp[0] & ACPI_EC_SMB_STS_STATUS)) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "transaction %d error", size));
- return (-1);
- }
-
- if (read_write == ACPI_SBS_SMBUS_WRITE) {
- return (0);
- }
-
- switch (size) {
-
- case ACPI_SBS_WORD_DATA:
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA, temp);
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA + 1, temp + 1);
- data->word = (temp[1] << 8) | temp[0];
- break;
-
- case ACPI_SBS_BLOCK_DATA:
- len = 0;
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_BCNT, &len);
- len = min_t(u8, len, 32);
- for (i = 0; i < len; i++)
- acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA + i,
- data->block + i + 1);
- data->block[0] = len;
- break;
- default:
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "unsupported transaction %d", size));
- return (-1);
- }
-
- return (0);
-}
-
-static int
-acpi_sbs_read_word(struct acpi_sbs *sbs, int addr, int func, u16 * word)
-{
- union sbs_rw_data data;
- int result = 0;
-
- result = acpi_ec_sbs_access(sbs, addr,
- ACPI_SBS_SMBUS_READ, func,
- ACPI_SBS_WORD_DATA, &data);
- if (result) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_ec_sbs_access() failed"));
- } else {
- *word = data.word;
- }
-
- return result;
-}
-
-static int
-acpi_sbs_read_str(struct acpi_sbs *sbs, int addr, int func, char *str)
-{
- union sbs_rw_data data;
- int result = 0;
-
- result = acpi_ec_sbs_access(sbs, addr,
- ACPI_SBS_SMBUS_READ, func,
- ACPI_SBS_BLOCK_DATA, &data);
- if (result) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_ec_sbs_access() failed"));
- } else {
- strncpy(str, (const char *)data.block + 1, data.block[0]);
- str[data.block[0]] = 0;
- }
-
- return result;
-}
-
-static int
-acpi_sbs_write_word(struct acpi_sbs *sbs, int addr, int func, int word)
-{
- union sbs_rw_data data;
- int result = 0;
-
- data.word = word;
-
- result = acpi_ec_sbs_access(sbs, addr,
- ACPI_SBS_SMBUS_WRITE, func,
- ACPI_SBS_WORD_DATA, &data);
- if (result) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_ec_sbs_access() failed"));
- }
-
- return result;
-}
-
static int sbs_zombie(struct acpi_sbs *sbs)
{
return (sbs->zombie);
int result = 0;
int is_present = 0;
- result = acpi_sbs_read_word(battery->sbs,
- ACPI_SBSM_SMBUS_ADDR, 0x01, &state);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
+ ACPI_SBSM_SMBUS_ADDR, 0x01, (u8 *)&state);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
}
if (!result) {
is_present = (state & 0x000f) & (1 << battery->id);
* it causes charging to halt on SBSELs */
result =
- acpi_sbs_read_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x01, &state);
+ acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SBSM_SMBUS_ADDR, 0x01, (u8 *)&state);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
foo = (state & 0x0fff) | (1 << (battery->id + 12));
result =
- acpi_sbs_write_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x01, foo);
+ acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD, ACPI_SBSM_SMBUS_ADDR, 0x01, (u8 *)&foo, 2);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_write_word() failed"));
+ "acpi_smbus_write() failed"));
goto end;
}
}
int result = 0;
s16 battery_system_info;
- result = acpi_sbs_read_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x04,
- &battery_system_info);
+ result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBSM_SMBUS_ADDR, 0x04,
+ (u8 *)&battery_system_info);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
sbs->sbsm_present = 1;
static int acpi_battery_get_info(struct acpi_battery *battery)
{
- struct acpi_sbs *sbs = battery->sbs;
int result = 0;
s16 battery_mode;
s16 specification_info;
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x03,
- &battery_mode);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x03,
+ (u8 *)&battery_mode);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
battery->info.capacity_mode = (battery_mode & 0x8000) >> 15;
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x10,
- &battery->info.full_charge_capacity);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x10,
+ (u8 *)&battery->info.full_charge_capacity);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x18,
- &battery->info.design_capacity);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x18,
+ (u8 *)&battery->info.design_capacity);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x19,
- &battery->info.design_voltage);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x19,
+ (u8 *)&battery->info.design_voltage);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x1a,
- &specification_info);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x1a,
+ (u8 *)&specification_info);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
battery->info.ipscale = 1;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x1c,
- &battery->info.serial_number);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x1c,
+ (u8 *)&battery->info.serial_number);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x20,
- battery->info.manufacturer_name);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_BLOCK, ACPI_SB_SMBUS_ADDR, 0x20,
+ (u8 *)battery->info.manufacturer_name);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
"acpi_sbs_read_str() failed"));
goto end;
}
- result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x21,
- battery->info.device_name);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_BLOCK, ACPI_SB_SMBUS_ADDR, 0x21,
+ (u8 *)battery->info.device_name);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
"acpi_sbs_read_str() failed"));
goto end;
}
- result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x22,
- battery->info.device_chemistry);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_BLOCK, ACPI_SB_SMBUS_ADDR, 0x22,
+ (u8 *)battery->info.device_chemistry);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
"acpi_sbs_read_str() failed"));
static int acpi_battery_get_state(struct acpi_battery *battery)
{
- struct acpi_sbs *sbs = battery->sbs;
int result = 0;
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x09,
- &battery->state.voltage);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x09,
+ (u8 *)&battery->state.voltage);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x0a,
- &battery->state.amperage);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x0a,
+ (u8 *)&battery->state.amperage);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x0f,
- &battery->state.remaining_capacity);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x0f,
+ (u8 *)&battery->state.remaining_capacity);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x16,
- &battery->state.battery_state);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x16,
+ (u8 *)&battery->state.battery_state);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
- struct acpi_sbs *sbs = battery->sbs;
int result = 0;
- result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01,
- &battery->alarm.remaining_capacity);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x01,
+ (u8 *)&battery->alarm.remaining_capacity);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
static int acpi_battery_set_alarm(struct acpi_battery *battery,
unsigned long alarm)
{
- struct acpi_sbs *sbs = battery->sbs;
int result = 0;
s16 battery_mode;
int foo;
if (alarm > 0) {
result =
- acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x03,
- &battery_mode);
+ acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x03,
+ (u8 *)&battery_mode);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
+ battery_mode &= 0xbfff;
result =
- acpi_sbs_write_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01,
- battery_mode & 0xbfff);
+ acpi_smbus_write(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x01,
+ (u8 *)&battery_mode, 2);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_write_word() failed"));
+ "acpi_smbus_write() failed"));
goto end;
}
}
foo = alarm / (battery->info.capacity_mode ? 10 : 1);
- result = acpi_sbs_write_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01, foo);
+ result = acpi_smbus_write(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SB_SMBUS_ADDR, 0x01, (u8 *)&foo, 2);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_write_word() failed"));
+ "acpi_smbus_write() failed"));
goto end;
}
static int acpi_battery_set_mode(struct acpi_battery *battery)
{
- struct acpi_sbs *sbs = battery->sbs;
int result = 0;
s16 battery_mode;
goto end;
}
- result = acpi_sbs_read_word(sbs,
- ACPI_SB_SMBUS_ADDR, 0x03, &battery_mode);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
+ ACPI_SB_SMBUS_ADDR, 0x03, (u8 *)&battery_mode);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
} else {
battery_mode |= 0x8000;
}
- result = acpi_sbs_write_word(sbs,
- ACPI_SB_SMBUS_ADDR, 0x03, battery_mode);
+ result = acpi_smbus_write(battery->sbs->hc, SMBUS_READ_WORD,
+ ACPI_SB_SMBUS_ADDR, 0x03, (u8 *)&battery_mode, 2);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_write_word() failed"));
+ "acpi_smbus_write() failed"));
goto end;
}
- result = acpi_sbs_read_word(sbs,
- ACPI_SB_SMBUS_ADDR, 0x03, &battery_mode);
+ result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
+ ACPI_SB_SMBUS_ADDR, 0x03, (u8 *)&battery_mode);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
int result = 0;
s16 charger_status;
- result = acpi_sbs_read_word(sbs, ACPI_SBC_SMBUS_ADDR, 0x13,
- &charger_status);
+ result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBC_SMBUS_ADDR, 0x13,
+ (u8 *)&charger_status);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR,
- "acpi_sbs_read_word() failed"));
+ "acpi_smbus_read() failed"));
goto end;
}
struct acpi_sbs *sbs = NULL;
int result = 0, remove_result = 0;
int id;
- acpi_status status = AE_OK;
- unsigned long val;
-
- status =
- acpi_evaluate_integer(device->handle, "_EC", NULL, &val);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Error obtaining _EC"));
- return -EIO;
- }
sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
if (!sbs) {
sbs_mutex_lock(sbs);
- sbs->base = 0xff & (val >> 8);
sbs->device = device;
+ sbs->hc = acpi_driver_data(device->parent);
strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
--- /dev/null
+/*
+ * SMBus driver for ACPI Embedded Controller (v0.1)
+ *
+ * Copyright (c) 2007 Alexey Starikovskiy
+ *
+ * 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 <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/actypes.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include "sbshc.h"
+
+#define ACPI_SMB_HC_CLASS "smbus_host_controller"
+#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;
+};
+
+static int acpi_smbus_hc_add(struct acpi_device *device);
+static int acpi_smbus_hc_remove(struct acpi_device *device, int type);
+
+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 inline int smb_check_done(struct acpi_smb_hc *hc)
+{
+ union acpi_smb_status status = {.raw = 0};
+ smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw);
+ return status.fields.done && (status.fields.status == SMBUS_OK);
+}
+
+static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
+{
+ if (wait_event_timeout(hc->wait, smb_check_done(hc),
+ msecs_to_jiffies(timeout)))
+ return 0;
+ else
+ return -ETIME;
+}
+
+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;
+
+ mutex_lock(&hc->lock);
+ 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);
+ 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);
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(acpi_smbus_unregister_callback);
+
+static 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;
+ if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
+ return 0;
+ /* Check if it is only a completion notify */
+ if (status.fields.done)
+ wake_up(&hc->wait);
+ if (!status.fields.alarm)
+ return 0;
+ mutex_lock(&hc->lock);
+ smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
+ if (hc->callback)
+ acpi_os_execute(OSL_GPE_HANDLER, acpi_smbus_callback, hc);
+ 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 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;
+ acpi_driver_data(device) = hc;
+
+ acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);
+ printk(KERN_INFO PREFIX "SBS HC: EC = 0x%p, offset = 0x%0x, query_bit = 0x%0x\n",
+ hc->ec, 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, int type)
+{
+ struct acpi_smb_hc *hc;
+
+ if (!device)
+ return -EINVAL;
+
+ hc = acpi_driver_data(device);
+ acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
+ kfree(hc);
+ return 0;
+}
+
+static int __init acpi_smb_hc_init(void)
+{
+ int result;
+
+ result = acpi_bus_register_driver(&acpi_smb_hc_driver);
+ if (result < 0)
+ return -ENODEV;
+ return 0;
+}
+
+static void __exit acpi_smb_hc_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_smb_hc_driver);
+}
+
+module_init(acpi_smb_hc_init);
+module_exit(acpi_smb_hc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexey Starikovskiy");
+MODULE_DESCRIPTION("ACPI SMBus HC driver");
projects / firefly-linux-kernel-4.4.55.git / commitdiff