Hi Guenter,
Thank you for the comments.
Please find the new version of the patch and my comments below.
Thanks.
Vadim.
On Tue, 2015-02-24 at 09:56 -0800, Guenter Roeck wrote:
> On Tue, Feb 24, 2015 at 07:09:48PM +0300, Vadim V. Vlasov wrote:
>...
> > +/* Access functions */
> > +/* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
> > +static int nct7904_read_reg(struct nct7904_data *data,
> > + unsigned bank, unsigned reg)
>
> In practice you never access a register without its page.
> Consider merging <bank, register> into a 16-bit value
> and decode it here.
I don't think it is a good idea.
>
> This way a register define would automatically include the page,
> which in turn would reduce the risk of accicdentially accessing
> a register from the wrong page.
You wrote that I'm supposed to trust my code :)
> > +static ssize_t
> > +store_mode(struct device *dev,
> > + struct device_attribute *devattr, const char *buf, size_t count)
> > +{
>>[...]
> > + ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + index, val);
> > +
> This is really combining two configurations into one, the fan control mode
> (manual or automatic), and its association with a temperature source
> as selected in bank 3 registers 0x09..0x0c. If you want to be able
> to configure that, it will need to be two separate attributes, one for the
> mode and one for the temperature source.
>
> Configuring automatic mode without also providing the means to configure
> registers 0x09..0x0c doesn't really make much sense.
No, I don't want to be able to configure automatic mode. I presume that
BIOS would do that better. The only thing I want to provide is
the ability to turn a fan into manual mode, play with RPM and return
it back to whatever automatic settings were provided by BIOS.
From: "Vadim V. Vlasov" <vvlasov@xxxxxxxxxxxxx>
Date: Thu, 26 Feb 2015 18:05:01 +0300
Subject: [PATCH] Add Nuvoton NCT7904 hwmon driver
Signed-off-by: Vadim V. Vlasov <vvlasov@xxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/nct7904.c | 607 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 618 insertions(+)
create mode 100644 drivers/hwmon/nct7904.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 110fade..d0d5988 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1145,6 +1145,16 @@ config SENSORS_NCT7802
This driver can also be built as a module. If so, the module
will be called nct7802.
+config SENSORS_NCT7904
+ tristate "Nuvoton NCT7904"
+ depends on X86 && I2C
+ help
+ If you say yes here you get support for the Nuvoton NCT7904
+ hardware monitoring chip, including manual fan speed control.
+
+ This driver can also be built as a module. If so, the module
+ will be called nct7904.
+
config SENSORS_PCF8591
tristate "Philips PCF8591 ADC/DAC"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 6c94147..b4a40f1 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -120,6 +120,7 @@ obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
obj-$(CONFIG_SENSORS_NCT6683) += nct6683.o
obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
+obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
new file mode 100644
index 0000000..e153c88
--- /dev/null
+++ b/drivers/hwmon/nct7904.c
@@ -0,0 +1,607 @@
+/*
+ * nct7904.c - driver for Nuvoton NCT7904D.
+ *
+ * Copyright (c) 2015 Kontron
+ * Author: Vadim V. Vlasov <vvlasov@xxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+/*
+ * Implemented features:
+ * - Fan inputs (rpm)
+ * - Voltage sensors (mV)
+ * - DTS/TSI and local temperature sensors (degree Celsius)
+ * - Fan PWM control
+ * - Setting Fan to manual mode
+ *
+ * Not implemented features:
+ * - SmartFan control
+ * - Watchdog
+ * - GPIO
+ * - external temperature sensors
+ * - SMI
+ * - min/max values
+ * - many other...
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.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;
+};
+
+
+/* Access functions */
+static int nct7904_bank_lock(struct nct7904_data *data, unsigned 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 bank, unsigned 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 bank, unsigned 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 bank, unsigned 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;
+}
+
+
+/* FANIN ATTR */
+static ssize_t show_fan(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int ret;
+ unsigned cnt, rpm;
+
+ ret = nct7904_read_reg16(data, BANK_0, FANIN1_HV_REG + index * 2);
+ if (ret < 0)
+ return ret;
+ cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
+ if (cnt == 0x1fff)
+ rpm = 0;
+ else
+ rpm = 1350000 / cnt;
+ return sprintf(buf, "%u\n", rpm);
+}
+
+static umode_t nct7904_fanin_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nct7904_data *data = dev_get_drvdata(dev);
+
+ if (data->fanin_mask & (1 << n))
+ return a->mode;
+ return 0;
+}
+
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
+static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan, NULL, 4);
+static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan, NULL, 5);
+static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan, NULL, 6);
+static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan, NULL, 7);
+static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, show_fan, NULL, 8);
+static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, show_fan, NULL, 9);
+static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, show_fan, NULL, 10);
+static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, show_fan, NULL, 11);
+
+static struct attribute *nct7904_fanin_attrs[] = {
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan2_input.dev_attr.attr,
+ &sensor_dev_attr_fan3_input.dev_attr.attr,
+ &sensor_dev_attr_fan4_input.dev_attr.attr,
+ &sensor_dev_attr_fan5_input.dev_attr.attr,
+ &sensor_dev_attr_fan6_input.dev_attr.attr,
+ &sensor_dev_attr_fan7_input.dev_attr.attr,
+ &sensor_dev_attr_fan8_input.dev_attr.attr,
+ &sensor_dev_attr_fan9_input.dev_attr.attr,
+ &sensor_dev_attr_fan10_input.dev_attr.attr,
+ &sensor_dev_attr_fan11_input.dev_attr.attr,
+ &sensor_dev_attr_fan12_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct7904_fanin_group = {
+ .attrs = nct7904_fanin_attrs,
+ .is_visible = nct7904_fanin_is_visible,
+};
+
+
+/* VSEN ATTR */
+static ssize_t show_voltage(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int ret;
+ int volt;
+
+ 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 */
+
+ return sprintf(buf, "%d\n", volt);
+}
+
+static ssize_t show_ltemp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int ret;
+ int temp;
+
+ ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
+ if (ret < 0)
+ return ret;
+ temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
+ temp = sign_extend32(temp, 10) * 125;
+
+ return sprintf(buf, "%d\n", temp);
+}
+
+static umode_t nct7904_vsen_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nct7904_data *data = dev_get_drvdata(dev);
+
+ if (data->vsen_mask & (1 << n))
+ return a->mode;
+ return 0;
+}
+
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_voltage, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_voltage, NULL, 1);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_voltage, NULL, 2);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_voltage, NULL, 3);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_voltage, NULL, 4);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_voltage, NULL, 5);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, show_voltage, NULL, 6);
+static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, show_voltage, NULL, 7);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, show_voltage, NULL, 8);
+static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, show_voltage, NULL, 9);
+static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, show_voltage, NULL, 10);
+static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, show_voltage, NULL, 11);
+static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, show_voltage, NULL, 12);
+static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, show_voltage, NULL, 13);
+/* Next 3 voltage sensors have specific names in the Nuvoton doc
+ * (3VDD, VBAT, 3VSB) but we use vacant numbers for them. */
+static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, show_voltage, NULL, 14);
+static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, show_voltage, NULL, 15);
+static SENSOR_DEVICE_ATTR(in20_input, S_IRUGO, show_voltage, NULL, 16);
+/* This is not a voltage, but a local temperature sensor. */
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_ltemp, NULL, 0);
+static SENSOR_DEVICE_ATTR(in17_input, S_IRUGO, show_voltage, NULL, 18);
+static SENSOR_DEVICE_ATTR(in18_input, S_IRUGO, show_voltage, NULL, 19);
+static SENSOR_DEVICE_ATTR(in19_input, S_IRUGO, show_voltage, NULL, 20);
+
+static struct attribute *nct7904_vsen_attrs[] = {
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in3_input.dev_attr.attr,
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+ &sensor_dev_attr_in5_input.dev_attr.attr,
+ &sensor_dev_attr_in6_input.dev_attr.attr,
+ &sensor_dev_attr_in7_input.dev_attr.attr,
+ &sensor_dev_attr_in8_input.dev_attr.attr,
+ &sensor_dev_attr_in9_input.dev_attr.attr,
+ &sensor_dev_attr_in10_input.dev_attr.attr,
+ &sensor_dev_attr_in11_input.dev_attr.attr,
+ &sensor_dev_attr_in12_input.dev_attr.attr,
+ &sensor_dev_attr_in13_input.dev_attr.attr,
+ &sensor_dev_attr_in14_input.dev_attr.attr,
+ &sensor_dev_attr_in15_input.dev_attr.attr,
+ &sensor_dev_attr_in16_input.dev_attr.attr,
+ &sensor_dev_attr_in20_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_in17_input.dev_attr.attr,
+ &sensor_dev_attr_in18_input.dev_attr.attr,
+ &sensor_dev_attr_in19_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct7904_vsen_group = {
+ .attrs = nct7904_vsen_attrs,
+ .is_visible = nct7904_vsen_is_visible,
+};
+
+
+/* CPU_TEMP ATTR */
+static ssize_t show_tcpu(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int ret;
+ int temp;
+
+ ret = nct7904_read_reg16(data, BANK_0, T_CPU1_HV_REG + index * 2);
+ if (ret < 0)
+ return ret;
+
+ temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
+ temp = sign_extend32(temp, 10) * 125;
+ return sprintf(buf, "%d\n", temp);
+}
+
+static umode_t nct7904_tcpu_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nct7904_data *data = dev_get_drvdata(dev);
+
+ if (data->tcpu_mask & (1 << n))
+ return a->mode;
+ return 0;
+}
+
+/* "temp1_input" reserved for local temp */
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_tcpu, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_tcpu, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_tcpu, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_tcpu, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_tcpu, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_tcpu, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_tcpu, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp9_input, S_IRUGO, show_tcpu, NULL, 7);
+
+static struct attribute *nct7904_tcpu_attrs[] = {
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+ &sensor_dev_attr_temp6_input.dev_attr.attr,
+ &sensor_dev_attr_temp7_input.dev_attr.attr,
+ &sensor_dev_attr_temp8_input.dev_attr.attr,
+ &sensor_dev_attr_temp9_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct7904_tcpu_group = {
+ .attrs = nct7904_tcpu_attrs,
+ .is_visible = nct7904_tcpu_is_visible,
+};
+
+
+/* PWM ATTR */
+static ssize_t store_pwm(struct device *dev,
+ struct device_attribute *devattr, const char *buf, size_t count)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ unsigned long val;
+ int ret;
+
+ if (kstrtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val > 255)
+ return -EINVAL;
+
+ ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + index, val);
+
+ return ret ? ret : count;
+}
+
+static ssize_t show_pwm(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int val;
+
+ val = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + index);
+ if (val < 0)
+ return val;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t store_mode(struct device *dev,
+ struct device_attribute *devattr, const char *buf, size_t count)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ unsigned long val;
+ int ret;
+
+ if (kstrtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+ switch (val) {
+ case 0:
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + index, val);
+
+ return ret ? ret : count;
+}
+
+static ssize_t show_mode(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct nct7904_data *data = dev_get_drvdata(dev);
+ int val;
+
+ val = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + index);
+ if (val < 0)
+ return val;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+/* 2 attributes per channel: pwm and mode */
+static SENSOR_DEVICE_ATTR(fan1_pwm, S_IRUGO | S_IWUSR,
+ show_pwm, store_pwm, 0);
+static SENSOR_DEVICE_ATTR(fan1_mode, S_IRUGO | S_IWUSR,
+ show_mode, store_mode, 0);
+static SENSOR_DEVICE_ATTR(fan2_pwm, S_IRUGO | S_IWUSR,
+ show_pwm, store_pwm, 1);
+static SENSOR_DEVICE_ATTR(fan2_mode, S_IRUGO | S_IWUSR,
+ show_mode, store_mode, 1);
+static SENSOR_DEVICE_ATTR(fan3_pwm, S_IRUGO | S_IWUSR,
+ show_pwm, store_pwm, 2);
+static SENSOR_DEVICE_ATTR(fan3_mode, S_IRUGO | S_IWUSR,
+ show_mode, store_mode, 2);
+static SENSOR_DEVICE_ATTR(fan4_pwm, S_IRUGO | S_IWUSR,
+ show_pwm, store_pwm, 3);
+static SENSOR_DEVICE_ATTR(fan4_mode, S_IRUGO | S_IWUSR,
+ show_mode, store_mode, 3);
+
+static struct attribute *nct7904_fanctl_attrs[] = {
+ &sensor_dev_attr_fan1_pwm.dev_attr.attr,
+ &sensor_dev_attr_fan1_mode.dev_attr.attr,
+ &sensor_dev_attr_fan2_pwm.dev_attr.attr,
+ &sensor_dev_attr_fan2_mode.dev_attr.attr,
+ &sensor_dev_attr_fan3_pwm.dev_attr.attr,
+ &sensor_dev_attr_fan3_mode.dev_attr.attr,
+ &sensor_dev_attr_fan4_pwm.dev_attr.attr,
+ &sensor_dev_attr_fan4_mode.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct7904_fanctl_group = {
+ .attrs = nct7904_fanctl_attrs,
+};
+
+
+static const struct attribute_group *nct7904_groups[] = {
+ &nct7904_fanin_group,
+ &nct7904_vsen_group,
+ &nct7904_tcpu_group,
+ &nct7904_fanctl_group,
+ NULL
+};
+
+
+/* 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))
+ return -ENODEV;
+
+ strlcpy(info->type, "nct7904", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int nct7904_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct nct7904_data *data;
+ struct device *hwmon_dev;
+ int ret;
+ u32 mask;
+
+ data = devm_kzalloc(&client->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);
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
+ client->name, data, nct7904_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id nct7904_id[] = {
+ {"nct7904", 0},
+ {}
+};
+
+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@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
+MODULE_LICENSE("GPL");
--
1.9.3
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