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linux-next/drivers/hwmon/pmbus/adm1275.c
Guenter Roeck 87102808d0 hwmon: (pmbus/adm1275) Validate device ID 
Since manufacturer and device ID are known, read and validate it.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
[Dan Carpenter <dan.carpenter@oracle.com>: Fixed memory leak]
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2012-01-05 08:19:27 -08:00

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8.4 KiB
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/*
* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
* and Digital Power Monitor
*
* 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.
*/
#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 "pmbus.h"
enum chips { adm1275, adm1276 };
#define ADM1275_PEAK_IOUT 0xd0
#define ADM1275_PEAK_VIN 0xd1
#define ADM1275_PEAK_VOUT 0xd2
#define ADM1275_PMON_CONFIG 0xd4
#define ADM1275_VIN_VOUT_SELECT (1 << 6)
#define ADM1275_VRANGE (1 << 5)
#define ADM1275_IOUT_WARN2_LIMIT 0xd7
#define ADM1275_DEVICE_CONFIG 0xd8
#define ADM1275_IOUT_WARN2_SELECT (1 << 4)
#define ADM1276_PEAK_PIN 0xda
#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0)
struct adm1275_data {
int id;
bool have_oc_fault;
struct pmbus_driver_info info;
};
#define to_adm1275_data(x) container_of(x, struct adm1275_data, info)
static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct adm1275_data *data = to_adm1275_data(info);
int ret = 0;
if (page)
return -ENXIO;
switch (reg) {
case PMBUS_IOUT_UC_FAULT_LIMIT:
if (data->have_oc_fault) {
ret = -ENXIO;
break;
}
ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
break;
case PMBUS_IOUT_OC_FAULT_LIMIT:
if (!data->have_oc_fault) {
ret = -ENXIO;
break;
}
ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
break;
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
break;
case PMBUS_VIRT_READ_VIN_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
break;
case PMBUS_VIRT_READ_PIN_MAX:
if (data->id != adm1276) {
ret = -ENXIO;
break;
}
ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_VIN_HISTORY:
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
if (data->id != adm1276)
ret = -ENXIO;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
if (page)
return -ENXIO;
switch (reg) {
case PMBUS_IOUT_UC_FAULT_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
word);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
break;
case PMBUS_VIRT_RESET_VIN_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct adm1275_data *data = to_adm1275_data(info);
int mfr_status, ret;
if (page > 0)
return -ENXIO;
switch (reg) {
case PMBUS_STATUS_IOUT:
ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
if (ret < 0)
break;
mfr_status = pmbus_read_byte_data(client, page,
PMBUS_STATUS_MFR_SPECIFIC);
if (mfr_status < 0) {
ret = mfr_status;
break;
}
if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
ret |= data->have_oc_fault ?
PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
}
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static const struct i2c_device_id adm1275_id[] = {
{ "adm1275", adm1275 },
{ "adm1276", adm1276 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adm1275_id);
static int adm1275_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
int config, device_config;
int ret;
struct pmbus_driver_info *info;
struct adm1275_data *data;
const struct i2c_device_id *mid;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
| I2C_FUNC_SMBUS_BLOCK_DATA))
return -ENODEV;
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
if (ret < 0) {
dev_err(&client->dev, "Failed to read Manufacturer ID\n");
return ret;
}
if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
dev_err(&client->dev, "Unsupported Manufacturer ID\n");
return -ENODEV;
}
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
if (ret < 0) {
dev_err(&client->dev, "Failed to read Manufacturer Model\n");
return ret;
}
for (mid = adm1275_id; mid->name[0]; mid++) {
if (!strncasecmp(mid->name, block_buffer, 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);
config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
if (config < 0)
return config;
device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
if (device_config < 0)
return device_config;
data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->id = mid->driver_data;
info = &data->info;
info->pages = 1;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_VOLTAGE_OUT] = direct;
info->format[PSC_CURRENT_OUT] = direct;
info->m[PSC_CURRENT_OUT] = 807;
info->b[PSC_CURRENT_OUT] = 20475;
info->R[PSC_CURRENT_OUT] = -1;
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
info->read_word_data = adm1275_read_word_data;
info->read_byte_data = adm1275_read_byte_data;
info->write_word_data = adm1275_write_word_data;
if (config & ADM1275_VRANGE) {
info->m[PSC_VOLTAGE_IN] = 19199;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -2;
info->m[PSC_VOLTAGE_OUT] = 19199;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -2;
} else {
info->m[PSC_VOLTAGE_IN] = 6720;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -1;
info->m[PSC_VOLTAGE_OUT] = 6720;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -1;
}
if (device_config & ADM1275_IOUT_WARN2_SELECT)
data->have_oc_fault = true;
switch (data->id) {
case adm1275:
if (config & ADM1275_VIN_VOUT_SELECT)
info->func[0] |=
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
else
info->func[0] |=
PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
break;
case adm1276:
info->format[PSC_POWER] = direct;
info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
| PMBUS_HAVE_STATUS_INPUT;
if (config & ADM1275_VIN_VOUT_SELECT)
info->func[0] |=
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
if (config & ADM1275_VRANGE) {
info->m[PSC_POWER] = 6043;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -2;
} else {
info->m[PSC_POWER] = 2115;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -1;
}
break;
}
ret = pmbus_do_probe(client, id, info);
if (ret)
goto err_mem;
return 0;
err_mem:
kfree(data);
return ret;
}
static int adm1275_remove(struct i2c_client *client)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct adm1275_data *data = to_adm1275_data(info);
pmbus_do_remove(client);
kfree(data);
return 0;
}
static struct i2c_driver adm1275_driver = {
.driver = {
.name = "adm1275",
},
.probe = adm1275_probe,
.remove = adm1275_remove,
.id_table = adm1275_id,
};
static int __init adm1275_init(void)
{
return i2c_add_driver(&adm1275_driver);
}
static void __exit adm1275_exit(void)
{
i2c_del_driver(&adm1275_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
MODULE_LICENSE("GPL");
module_init(adm1275_init);
module_exit(adm1275_exit);
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