279 lines
6.6 KiB
C
279 lines
6.6 KiB
C
/*
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* Hardware monitoring driver for UCD90xxx Sequencer and System Health
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* Controller series
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*
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* Copyright (C) 2011 Ericsson AB.
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c/pmbus.h>
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#include "pmbus.h"
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enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
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#define UCD9000_MONITOR_CONFIG 0xd5
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#define UCD9000_NUM_PAGES 0xd6
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#define UCD9000_FAN_CONFIG_INDEX 0xe7
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#define UCD9000_FAN_CONFIG 0xe8
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#define UCD9000_DEVICE_ID 0xfd
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#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
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#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
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#define UCD9000_MON_VOLTAGE 1
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#define UCD9000_MON_TEMPERATURE 2
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#define UCD9000_MON_CURRENT 3
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#define UCD9000_MON_VOLTAGE_HW 4
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#define UCD9000_NUM_FAN 4
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struct ucd9000_data {
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u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
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struct pmbus_driver_info info;
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};
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#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
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static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
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{
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int fan_config = 0;
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struct ucd9000_data *data
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= to_ucd9000_data(pmbus_get_driver_info(client));
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if (data->fan_data[fan][3] & 1)
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fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
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/* Pulses/revolution */
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fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
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return fan_config;
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}
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static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret = 0;
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int fan_config;
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switch (reg) {
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case PMBUS_FAN_CONFIG_12:
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if (page)
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return -EINVAL;
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ret = ucd9000_get_fan_config(client, 0);
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if (ret < 0)
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return ret;
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fan_config = ret << 4;
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ret = ucd9000_get_fan_config(client, 1);
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if (ret < 0)
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return ret;
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fan_config |= ret;
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ret = fan_config;
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break;
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case PMBUS_FAN_CONFIG_34:
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if (page)
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return -EINVAL;
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ret = ucd9000_get_fan_config(client, 2);
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if (ret < 0)
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return ret;
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fan_config = ret << 4;
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ret = ucd9000_get_fan_config(client, 3);
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if (ret < 0)
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return ret;
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fan_config |= ret;
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ret = fan_config;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static const struct i2c_device_id ucd9000_id[] = {
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{"ucd9000", ucd9000},
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{"ucd90120", ucd90120},
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{"ucd90124", ucd90124},
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{"ucd9090", ucd9090},
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{"ucd90910", ucd90910},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ucd9000_id);
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static int ucd9000_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
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struct ucd9000_data *data;
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struct pmbus_driver_info *info;
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const struct i2c_device_id *mid;
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int i, ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
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block_buffer);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read device ID\n");
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return ret;
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}
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block_buffer[ret] = '\0';
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dev_info(&client->dev, "Device ID %s\n", block_buffer);
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mid = NULL;
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for (i = 0; i < ARRAY_SIZE(ucd9000_id); i++) {
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mid = &ucd9000_id[i];
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if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
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break;
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}
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if (!mid || !strlen(mid->name)) {
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dev_err(&client->dev, "Unsupported device\n");
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return -ENODEV;
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}
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if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
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dev_notice(&client->dev,
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"Device mismatch: Configured %s, detected %s\n",
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id->name, mid->name);
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data = kzalloc(sizeof(struct ucd9000_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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info = &data->info;
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ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
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if (ret < 0) {
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dev_err(&client->dev,
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"Failed to read number of active pages\n");
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goto out;
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}
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info->pages = ret;
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if (!info->pages) {
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dev_err(&client->dev, "No pages configured\n");
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ret = -ENODEV;
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goto out;
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}
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/* The internal temperature sensor is always active */
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info->func[0] = PMBUS_HAVE_TEMP;
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/* Everything else is configurable */
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ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
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block_buffer);
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if (ret <= 0) {
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dev_err(&client->dev, "Failed to read configuration data\n");
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ret = -ENODEV;
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goto out;
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}
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for (i = 0; i < ret; i++) {
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int page = UCD9000_MON_PAGE(block_buffer[i]);
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if (page >= info->pages)
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continue;
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switch (UCD9000_MON_TYPE(block_buffer[i])) {
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case UCD9000_MON_VOLTAGE:
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case UCD9000_MON_VOLTAGE_HW:
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info->func[page] |= PMBUS_HAVE_VOUT
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| PMBUS_HAVE_STATUS_VOUT;
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break;
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case UCD9000_MON_TEMPERATURE:
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info->func[page] |= PMBUS_HAVE_TEMP2
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| PMBUS_HAVE_STATUS_TEMP;
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break;
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case UCD9000_MON_CURRENT:
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info->func[page] |= PMBUS_HAVE_IOUT
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| PMBUS_HAVE_STATUS_IOUT;
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break;
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default:
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break;
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}
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}
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/* Fan configuration */
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if (mid->driver_data == ucd90124) {
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for (i = 0; i < UCD9000_NUM_FAN; i++) {
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i2c_smbus_write_byte_data(client,
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UCD9000_FAN_CONFIG_INDEX, i);
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ret = i2c_smbus_read_block_data(client,
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UCD9000_FAN_CONFIG,
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data->fan_data[i]);
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if (ret < 0)
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goto out;
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}
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i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
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info->read_byte_data = ucd9000_read_byte_data;
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info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
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| PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
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}
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ret = pmbus_do_probe(client, mid, info);
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if (ret < 0)
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goto out;
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return 0;
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out:
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kfree(data);
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return ret;
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}
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static int ucd9000_remove(struct i2c_client *client)
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{
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int ret;
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struct ucd9000_data *data;
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data = to_ucd9000_data(pmbus_get_driver_info(client));
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ret = pmbus_do_remove(client);
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kfree(data);
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return ret;
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}
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/* This is the driver that will be inserted */
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static struct i2c_driver ucd9000_driver = {
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.driver = {
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.name = "ucd9000",
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},
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.probe = ucd9000_probe,
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.remove = ucd9000_remove,
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.id_table = ucd9000_id,
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};
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static int __init ucd9000_init(void)
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{
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return i2c_add_driver(&ucd9000_driver);
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}
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static void __exit ucd9000_exit(void)
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{
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i2c_del_driver(&ucd9000_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
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MODULE_LICENSE("GPL");
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module_init(ucd9000_init);
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module_exit(ucd9000_exit);
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