linux/drivers/hwmon/nct7904.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

536 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* nct7904.c - driver for Nuvoton NCT7904D.
*
* Copyright (c) 2015 Kontron
* Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/hwmon.h>
#define VENDOR_ID_REG 0x7A /* Any bank */
#define NUVOTON_ID 0x50
#define CHIP_ID_REG 0x7B /* Any bank */
#define NCT7904_ID 0xC5
#define DEVICE_ID_REG 0x7C /* Any bank */
#define BANK_SEL_REG 0xFF
#define BANK_0 0x00
#define BANK_1 0x01
#define BANK_2 0x02
#define BANK_3 0x03
#define BANK_4 0x04
#define BANK_MAX 0x04
#define FANIN_MAX 12 /* Counted from 1 */
#define VSEN_MAX 21 /* VSEN1..14, 3VDD, VBAT, V3VSB,
LTD (not a voltage), VSEN17..19 */
#define FANCTL_MAX 4 /* Counted from 1 */
#define TCPU_MAX 8 /* Counted from 1 */
#define TEMP_MAX 4 /* Counted from 1 */
#define VT_ADC_CTRL0_REG 0x20 /* Bank 0 */
#define VT_ADC_CTRL1_REG 0x21 /* Bank 0 */
#define VT_ADC_CTRL2_REG 0x22 /* Bank 0 */
#define FANIN_CTRL0_REG 0x24
#define FANIN_CTRL1_REG 0x25
#define DTS_T_CTRL0_REG 0x26
#define DTS_T_CTRL1_REG 0x27
#define VT_ADC_MD_REG 0x2E
#define VSEN1_HV_REG 0x40 /* Bank 0; 2 regs (HV/LV) per sensor */
#define TEMP_CH1_HV_REG 0x42 /* Bank 0; same as VSEN2_HV */
#define LTD_HV_REG 0x62 /* Bank 0; 2 regs in VSEN range */
#define FANIN1_HV_REG 0x80 /* Bank 0; 2 regs (HV/LV) per sensor */
#define T_CPU1_HV_REG 0xA0 /* Bank 0; 2 regs (HV/LV) per sensor */
#define PRTS_REG 0x03 /* Bank 2 */
#define FANCTL1_FMR_REG 0x00 /* Bank 3; 1 reg per channel */
#define FANCTL1_OUT_REG 0x10 /* Bank 3; 1 reg per channel */
static const unsigned short normal_i2c[] = {
0x2d, 0x2e, I2C_CLIENT_END
};
struct nct7904_data {
struct i2c_client *client;
struct mutex bank_lock;
int bank_sel;
u32 fanin_mask;
u32 vsen_mask;
u32 tcpu_mask;
u8 fan_mode[FANCTL_MAX];
};
/* Access functions */
static int nct7904_bank_lock(struct nct7904_data *data, unsigned int bank)
{
int ret;
mutex_lock(&data->bank_lock);
if (data->bank_sel == bank)
return 0;
ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank);
if (ret == 0)
data->bank_sel = bank;
else
data->bank_sel = -1;
return ret;
}
static inline void nct7904_bank_release(struct nct7904_data *data)
{
mutex_unlock(&data->bank_lock);
}
/* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
static int nct7904_read_reg(struct nct7904_data *data,
unsigned int bank, unsigned int reg)
{
struct i2c_client *client = data->client;
int ret;
ret = nct7904_bank_lock(data, bank);
if (ret == 0)
ret = i2c_smbus_read_byte_data(client, reg);
nct7904_bank_release(data);
return ret;
}
/*
* Read 2-byte register. Returns register in big-endian format or
* -ERRNO on error.
*/
static int nct7904_read_reg16(struct nct7904_data *data,
unsigned int bank, unsigned int reg)
{
struct i2c_client *client = data->client;
int ret, hi;
ret = nct7904_bank_lock(data, bank);
if (ret == 0) {
ret = i2c_smbus_read_byte_data(client, reg);
if (ret >= 0) {
hi = ret;
ret = i2c_smbus_read_byte_data(client, reg + 1);
if (ret >= 0)
ret |= hi << 8;
}
}
nct7904_bank_release(data);
return ret;
}
/* Write 1-byte register. Returns 0 or -ERRNO on error. */
static int nct7904_write_reg(struct nct7904_data *data,
unsigned int bank, unsigned int reg, u8 val)
{
struct i2c_client *client = data->client;
int ret;
ret = nct7904_bank_lock(data, bank);
if (ret == 0)
ret = i2c_smbus_write_byte_data(client, reg, val);
nct7904_bank_release(data);
return ret;
}
static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
struct nct7904_data *data = dev_get_drvdata(dev);
unsigned int cnt, rpm;
int ret;
switch (attr) {
case hwmon_fan_input:
ret = nct7904_read_reg16(data, BANK_0,
FANIN1_HV_REG + channel * 2);
if (ret < 0)
return ret;
cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
if (cnt == 0x1fff)
rpm = 0;
else
rpm = 1350000 / cnt;
*val = rpm;
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t nct7904_fan_is_visible(const void *_data, u32 attr, int channel)
{
const struct nct7904_data *data = _data;
if (attr == hwmon_fan_input && data->fanin_mask & (1 << channel))
return 0444;
return 0;
}
static u8 nct7904_chan_to_index[] = {
0, /* Not used */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
18, 19, 20, 16
};
static int nct7904_read_in(struct device *dev, u32 attr, int channel,
long *val)
{
struct nct7904_data *data = dev_get_drvdata(dev);
int ret, volt, index;
index = nct7904_chan_to_index[channel];
switch (attr) {
case hwmon_in_input:
ret = nct7904_read_reg16(data, BANK_0,
VSEN1_HV_REG + index * 2);
if (ret < 0)
return ret;
volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
if (index < 14)
volt *= 2; /* 0.002V scale */
else
volt *= 6; /* 0.006V scale */
*val = volt;
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t nct7904_in_is_visible(const void *_data, u32 attr, int channel)
{
const struct nct7904_data *data = _data;
int index = nct7904_chan_to_index[channel];
if (channel > 0 && attr == hwmon_in_input &&
(data->vsen_mask & BIT(index)))
return 0444;
return 0;
}
static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
long *val)
{
struct nct7904_data *data = dev_get_drvdata(dev);
int ret, temp;
switch (attr) {
case hwmon_temp_input:
if (channel == 0)
ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
else
ret = nct7904_read_reg16(data, BANK_0,
T_CPU1_HV_REG + (channel - 1) * 2);
if (ret < 0)
return ret;
temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
*val = sign_extend32(temp, 10) * 125;
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
{
const struct nct7904_data *data = _data;
if (attr == hwmon_temp_input) {
if (channel == 0) {
if (data->vsen_mask & BIT(17))
return 0444;
} else {
if (data->tcpu_mask & BIT(channel - 1))
return 0444;
}
}
return 0;
}
static int nct7904_read_pwm(struct device *dev, u32 attr, int channel,
long *val)
{
struct nct7904_data *data = dev_get_drvdata(dev);
int ret;
switch (attr) {
case hwmon_pwm_input:
ret = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + channel);
if (ret < 0)
return ret;
*val = ret;
return 0;
case hwmon_pwm_enable:
ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + channel);
if (ret < 0)
return ret;
*val = ret ? 2 : 1;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int nct7904_write_pwm(struct device *dev, u32 attr, int channel,
long val)
{
struct nct7904_data *data = dev_get_drvdata(dev);
int ret;
switch (attr) {
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + channel,
val);
return ret;
case hwmon_pwm_enable:
if (val < 1 || val > 2 ||
(val == 2 && !data->fan_mode[channel]))
return -EINVAL;
ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + channel,
val == 2 ? data->fan_mode[channel] : 0);
return ret;
default:
return -EOPNOTSUPP;
}
}
static umode_t nct7904_pwm_is_visible(const void *_data, u32 attr, int channel)
{
switch (attr) {
case hwmon_pwm_input:
case hwmon_pwm_enable:
return 0644;
default:
return 0;
}
}
static int nct7904_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_in:
return nct7904_read_in(dev, attr, channel, val);
case hwmon_fan:
return nct7904_read_fan(dev, attr, channel, val);
case hwmon_pwm:
return nct7904_read_pwm(dev, attr, channel, val);
case hwmon_temp:
return nct7904_read_temp(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int nct7904_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_pwm:
return nct7904_write_pwm(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t nct7904_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_in:
return nct7904_in_is_visible(data, attr, channel);
case hwmon_fan:
return nct7904_fan_is_visible(data, attr, channel);
case hwmon_pwm:
return nct7904_pwm_is_visible(data, attr, channel);
case hwmon_temp:
return nct7904_temp_is_visible(data, attr, channel);
default:
return 0;
}
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int nct7904_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_BYTE |
I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
return -ENODEV;
/* Determine the chip type. */
if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID ||
i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID ||
(i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 ||
(i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00)
return -ENODEV;
strlcpy(info->type, "nct7904", I2C_NAME_SIZE);
return 0;
}
static const struct hwmon_channel_info *nct7904_info[] = {
HWMON_CHANNEL_INFO(in,
HWMON_I_INPUT, /* dummy, skipped in is_visible */
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT),
NULL
};
static const struct hwmon_ops nct7904_hwmon_ops = {
.is_visible = nct7904_is_visible,
.read = nct7904_read,
.write = nct7904_write,
};
static const struct hwmon_chip_info nct7904_chip_info = {
.ops = &nct7904_hwmon_ops,
.info = nct7904_info,
};
static int nct7904_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct nct7904_data *data;
struct device *hwmon_dev;
struct device *dev = &client->dev;
int ret, i;
u32 mask;
data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->bank_lock);
data->bank_sel = -1;
/* Setup sensor groups. */
/* FANIN attributes */
ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG);
if (ret < 0)
return ret;
data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8);
/*
* VSEN attributes
*
* Note: voltage sensors overlap with external temperature
* sensors. So, if we ever decide to support the latter
* we will have to adjust 'vsen_mask' accordingly.
*/
mask = 0;
ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG);
if (ret >= 0)
mask = (ret >> 8) | ((ret & 0xff) << 8);
ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
if (ret >= 0)
mask |= (ret << 16);
data->vsen_mask = mask;
/* CPU_TEMP attributes */
ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG);
if (ret < 0)
return ret;
data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4);
for (i = 0; i < FANCTL_MAX; i++) {
ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);
if (ret < 0)
return ret;
data->fan_mode[i] = ret;
}
hwmon_dev =
devm_hwmon_device_register_with_info(dev, client->name, data,
&nct7904_chip_info, NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id nct7904_id[] = {
{"nct7904", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, nct7904_id);
static struct i2c_driver nct7904_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "nct7904",
},
.probe = nct7904_probe,
.id_table = nct7904_id,
.detect = nct7904_detect,
.address_list = normal_i2c,
};
module_i2c_driver(nct7904_driver);
MODULE_AUTHOR("Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>");
MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
MODULE_LICENSE("GPL");