282 lines
6.8 KiB
C
282 lines
6.8 KiB
C
/*
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* Hardware monitoring driver for ZL6100 and compatibles
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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/ktime.h>
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#include <linux/delay.h>
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#include "pmbus.h"
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enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 };
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struct zl6100_data {
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int id;
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ktime_t access; /* chip access time */
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int delay; /* Delay between chip accesses in uS */
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struct pmbus_driver_info info;
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};
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#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
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#define ZL6100_MFR_CONFIG 0xd0
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#define ZL6100_DEVICE_ID 0xe4
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#define ZL6100_MFR_XTEMP_ENABLE (1 << 7)
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#define ZL6100_WAIT_TIME 1000 /* uS */
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static ushort delay = ZL6100_WAIT_TIME;
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module_param(delay, ushort, 0644);
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MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
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/* Some chips need a delay between accesses */
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static inline void zl6100_wait(const struct zl6100_data *data)
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{
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if (data->delay) {
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s64 delta = ktime_us_delta(ktime_get(), data->access);
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if (delta < data->delay)
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udelay(data->delay - delta);
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}
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}
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static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret;
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if (page || reg >= PMBUS_VIRT_BASE)
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return -ENXIO;
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if (data->id == zl2005) {
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/*
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* Limit register detection is not reliable on ZL2005.
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* Make sure registers are not erroneously detected.
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*/
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switch (reg) {
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case PMBUS_VOUT_OV_WARN_LIMIT:
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case PMBUS_VOUT_UV_WARN_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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return -ENXIO;
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}
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}
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zl6100_wait(data);
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ret = pmbus_read_word_data(client, page, reg);
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data->access = ktime_get();
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return ret;
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}
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static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret;
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if (page > 0)
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return -ENXIO;
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zl6100_wait(data);
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ret = pmbus_read_byte_data(client, page, reg);
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data->access = ktime_get();
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return ret;
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}
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static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret;
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if (page || reg >= PMBUS_VIRT_BASE)
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return -ENXIO;
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zl6100_wait(data);
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ret = pmbus_write_word_data(client, page, reg, word);
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data->access = ktime_get();
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return ret;
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}
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static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret;
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if (page > 0)
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return -ENXIO;
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zl6100_wait(data);
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ret = pmbus_write_byte(client, page, value);
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data->access = ktime_get();
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return ret;
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}
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static const struct i2c_device_id zl6100_id[] = {
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{"bmr450", zl2005},
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{"bmr451", zl2005},
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{"bmr462", zl2008},
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{"bmr463", zl2008},
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{"bmr464", zl2008},
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{"zl2004", zl2004},
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{"zl2005", zl2005},
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{"zl2006", zl2006},
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{"zl2008", zl2008},
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{"zl2105", zl2105},
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{"zl2106", zl2106},
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{"zl6100", zl6100},
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{"zl6105", zl6105},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, zl6100_id);
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static int zl6100_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct zl6100_data *data;
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struct pmbus_driver_info *info;
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u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
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const struct i2c_device_id *mid;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA
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| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
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device_id);
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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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device_id[ret] = '\0';
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dev_info(&client->dev, "Device ID %s\n", device_id);
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mid = NULL;
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for (mid = zl6100_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
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break;
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}
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if (!mid->name[0]) {
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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 != 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 zl6100_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->id = mid->driver_data;
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/*
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* According to information from the chip vendor, all currently
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* supported chips are known to require a wait time between I2C
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* accesses.
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*/
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data->delay = delay;
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/*
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* Since there was a direct I2C device access above, wait before
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* accessing the chip again.
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*/
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data->access = ktime_get();
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zl6100_wait(data);
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info = &data->info;
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info->pages = 1;
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info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
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ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
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if (ret < 0)
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goto err_mem;
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if (ret & ZL6100_MFR_XTEMP_ENABLE)
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info->func[0] |= PMBUS_HAVE_TEMP2;
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data->access = ktime_get();
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zl6100_wait(data);
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info->read_word_data = zl6100_read_word_data;
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info->read_byte_data = zl6100_read_byte_data;
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info->write_word_data = zl6100_write_word_data;
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info->write_byte = zl6100_write_byte;
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ret = pmbus_do_probe(client, mid, info);
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if (ret)
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goto err_mem;
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return 0;
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err_mem:
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kfree(data);
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return ret;
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}
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static int zl6100_remove(struct i2c_client *client)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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const struct zl6100_data *data = to_zl6100_data(info);
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pmbus_do_remove(client);
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kfree(data);
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return 0;
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}
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static struct i2c_driver zl6100_driver = {
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.driver = {
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.name = "zl6100",
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},
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.probe = zl6100_probe,
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.remove = zl6100_remove,
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.id_table = zl6100_id,
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};
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static int __init zl6100_init(void)
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{
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return i2c_add_driver(&zl6100_driver);
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}
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static void __exit zl6100_exit(void)
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{
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i2c_del_driver(&zl6100_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
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MODULE_LICENSE("GPL");
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module_init(zl6100_init);
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module_exit(zl6100_exit);
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