260 lines
6.4 KiB
C
260 lines
6.4 KiB
C
/*
|
|
* Hardware monitoring driver for ZL6100 and compatibles
|
|
*
|
|
* Copyright (c) 2011 Ericsson AB.
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/ktime.h>
|
|
#include <linux/delay.h>
|
|
#include "pmbus.h"
|
|
|
|
enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
|
|
zl9101, zl9117 };
|
|
|
|
struct zl6100_data {
|
|
int id;
|
|
ktime_t access; /* chip access time */
|
|
int delay; /* Delay between chip accesses in uS */
|
|
struct pmbus_driver_info info;
|
|
};
|
|
|
|
#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
|
|
|
|
#define ZL6100_MFR_CONFIG 0xd0
|
|
#define ZL6100_DEVICE_ID 0xe4
|
|
|
|
#define ZL6100_MFR_XTEMP_ENABLE (1 << 7)
|
|
|
|
#define ZL6100_WAIT_TIME 1000 /* uS */
|
|
|
|
static ushort delay = ZL6100_WAIT_TIME;
|
|
module_param(delay, ushort, 0644);
|
|
MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
|
|
|
|
/* Some chips need a delay between accesses */
|
|
static inline void zl6100_wait(const struct zl6100_data *data)
|
|
{
|
|
if (data->delay) {
|
|
s64 delta = ktime_us_delta(ktime_get(), data->access);
|
|
if (delta < data->delay)
|
|
udelay(data->delay - delta);
|
|
}
|
|
}
|
|
|
|
static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct zl6100_data *data = to_zl6100_data(info);
|
|
int ret;
|
|
|
|
if (page || reg >= PMBUS_VIRT_BASE)
|
|
return -ENXIO;
|
|
|
|
if (data->id == zl2005) {
|
|
/*
|
|
* Limit register detection is not reliable on ZL2005.
|
|
* Make sure registers are not erroneously detected.
|
|
*/
|
|
switch (reg) {
|
|
case PMBUS_VOUT_OV_WARN_LIMIT:
|
|
case PMBUS_VOUT_UV_WARN_LIMIT:
|
|
case PMBUS_IOUT_OC_WARN_LIMIT:
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
|
|
zl6100_wait(data);
|
|
ret = pmbus_read_word_data(client, page, reg);
|
|
data->access = ktime_get();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct zl6100_data *data = to_zl6100_data(info);
|
|
int ret;
|
|
|
|
if (page > 0)
|
|
return -ENXIO;
|
|
|
|
zl6100_wait(data);
|
|
ret = pmbus_read_byte_data(client, page, reg);
|
|
data->access = ktime_get();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
|
|
u16 word)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct zl6100_data *data = to_zl6100_data(info);
|
|
int ret;
|
|
|
|
if (page || reg >= PMBUS_VIRT_BASE)
|
|
return -ENXIO;
|
|
|
|
zl6100_wait(data);
|
|
ret = pmbus_write_word_data(client, page, reg, word);
|
|
data->access = ktime_get();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct zl6100_data *data = to_zl6100_data(info);
|
|
int ret;
|
|
|
|
if (page > 0)
|
|
return -ENXIO;
|
|
|
|
zl6100_wait(data);
|
|
ret = pmbus_write_byte(client, page, value);
|
|
data->access = ktime_get();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct i2c_device_id zl6100_id[] = {
|
|
{"bmr450", zl2005},
|
|
{"bmr451", zl2005},
|
|
{"bmr462", zl2008},
|
|
{"bmr463", zl2008},
|
|
{"bmr464", zl2008},
|
|
{"zl2004", zl2004},
|
|
{"zl2005", zl2005},
|
|
{"zl2006", zl2006},
|
|
{"zl2008", zl2008},
|
|
{"zl2105", zl2105},
|
|
{"zl2106", zl2106},
|
|
{"zl6100", zl6100},
|
|
{"zl6105", zl6105},
|
|
{"zl9101", zl9101},
|
|
{"zl9117", zl9117},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, zl6100_id);
|
|
|
|
static int zl6100_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
struct zl6100_data *data;
|
|
struct pmbus_driver_info *info;
|
|
u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
|
|
const struct i2c_device_id *mid;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_WORD_DATA
|
|
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
|
|
device_id);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read device ID\n");
|
|
return ret;
|
|
}
|
|
device_id[ret] = '\0';
|
|
dev_info(&client->dev, "Device ID %s\n", device_id);
|
|
|
|
mid = NULL;
|
|
for (mid = zl6100_id; mid->name[0]; mid++) {
|
|
if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
|
|
break;
|
|
}
|
|
if (!mid->name[0]) {
|
|
dev_err(&client->dev, "Unsupported device\n");
|
|
return -ENODEV;
|
|
}
|
|
if (id->driver_data != mid->driver_data)
|
|
dev_notice(&client->dev,
|
|
"Device mismatch: Configured %s, detected %s\n",
|
|
id->name, mid->name);
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
|
|
GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->id = mid->driver_data;
|
|
|
|
/*
|
|
* According to information from the chip vendor, all currently
|
|
* supported chips are known to require a wait time between I2C
|
|
* accesses.
|
|
*/
|
|
data->delay = delay;
|
|
|
|
/*
|
|
* Since there was a direct I2C device access above, wait before
|
|
* accessing the chip again.
|
|
*/
|
|
data->access = ktime_get();
|
|
zl6100_wait(data);
|
|
|
|
info = &data->info;
|
|
|
|
info->pages = 1;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
|
|
|
ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret & ZL6100_MFR_XTEMP_ENABLE)
|
|
info->func[0] |= PMBUS_HAVE_TEMP2;
|
|
|
|
data->access = ktime_get();
|
|
zl6100_wait(data);
|
|
|
|
info->read_word_data = zl6100_read_word_data;
|
|
info->read_byte_data = zl6100_read_byte_data;
|
|
info->write_word_data = zl6100_write_word_data;
|
|
info->write_byte = zl6100_write_byte;
|
|
|
|
return pmbus_do_probe(client, mid, info);
|
|
}
|
|
|
|
static struct i2c_driver zl6100_driver = {
|
|
.driver = {
|
|
.name = "zl6100",
|
|
},
|
|
.probe = zl6100_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = zl6100_id,
|
|
};
|
|
|
|
module_i2c_driver(zl6100_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck");
|
|
MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
|
|
MODULE_LICENSE("GPL");
|