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[PATCH] w83627ehf: Add voltage inputs support
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Add the voltage measuring support to W83627EHF. The code is based
on the patch provided by Yuan Mu from Winbond.

Signed-off-by: Yuan Mu <Ymu@winbond.com.tw>
Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Rudolf Marek authored and Greg Kroah-Hartman committed Jun 22, 2006
1 parent 43cb7eb commit cf0676f
Showing 1 changed file with 120 additions and 4 deletions.
124 changes: 120 additions & 4 deletions drivers/hwmon/w83627ehf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -30,10 +30,7 @@
Supports the following chips:
Chip #vin #fan #pwm #temp chip_id man_id
w83627ehf - 5 - 3 0x88 0x5ca3
This is a preliminary version of the driver, only supporting the
fan and temperature inputs. The chip does much more than that.
w83627ehf 10 5 - 3 0x88 0x5ca3
*/

#include <linux/module.h>
Expand Down Expand Up @@ -121,6 +118,14 @@ superio_exit(void)
static const u16 W83627EHF_REG_FAN[] = { 0x28, 0x29, 0x2a, 0x3f, 0x553 };
static const u16 W83627EHF_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d, 0x3e, 0x55c };

/* The W83627EHF registers for nr=7,8,9 are in bank 5 */
#define W83627EHF_REG_IN_MAX(nr) ((nr < 7) ? (0x2b + (nr) * 2) : \
(0x554 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN_MIN(nr) ((nr < 7) ? (0x2c + (nr) * 2) : \
(0x555 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN(nr) ((nr < 7) ? (0x20 + (nr)) : \
(0x550 + (nr) - 7))

#define W83627EHF_REG_TEMP1 0x27
#define W83627EHF_REG_TEMP1_HYST 0x3a
#define W83627EHF_REG_TEMP1_OVER 0x39
Expand Down Expand Up @@ -172,6 +177,20 @@ temp1_to_reg(int temp)
return (temp + 500) / 1000;
}

/* Some of analog inputs have internal scaling (2x), 8mV is ADC LSB */

static u8 scale_in[10] = { 8, 8, 16, 16, 8, 8, 8, 16, 16, 8 };

static inline long in_from_reg(u8 reg, u8 nr)
{
return reg * scale_in[nr];
}

static inline u8 in_to_reg(u32 val, u8 nr)
{
return SENSORS_LIMIT(((val + (scale_in[nr] / 2)) / scale_in[nr]), 0, 255);
}

/*
* Data structures and manipulation thereof
*/
Expand All @@ -186,6 +205,9 @@ struct w83627ehf_data {
unsigned long last_updated; /* In jiffies */

/* Register values */
u8 in[10]; /* Register value */
u8 in_max[10]; /* Register value */
u8 in_min[10]; /* Register value */
u8 fan[5];
u8 fan_min[5];
u8 fan_div[5];
Expand Down Expand Up @@ -349,6 +371,16 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
data->fan_div[3] |= (i >> 5) & 0x04;
}

/* Measured voltages and limits */
for (i = 0; i < 10; i++) {
data->in[i] = w83627ehf_read_value(client,
W83627EHF_REG_IN(i));
data->in_min[i] = w83627ehf_read_value(client,
W83627EHF_REG_IN_MIN(i));
data->in_max[i] = w83627ehf_read_value(client,
W83627EHF_REG_IN_MAX(i));
}

/* Measured fan speeds and limits */
for (i = 0; i < 5; i++) {
if (!(data->has_fan & (1 << i)))
Expand Down Expand Up @@ -406,6 +438,87 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
/*
* Sysfs callback functions
*/
#define show_in_reg(reg) \
static ssize_t \
show_##reg(struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct w83627ehf_data *data = w83627ehf_update_device(dev); \
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); \
int nr = sensor_attr->index; \
return sprintf(buf, "%ld\n", in_from_reg(data->reg[nr], nr)); \
}
show_in_reg(in)
show_in_reg(in_min)
show_in_reg(in_max)

#define store_in_reg(REG, reg) \
static ssize_t \
store_in_##reg (struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct w83627ehf_data *data = i2c_get_clientdata(client); \
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); \
int nr = sensor_attr->index; \
u32 val = simple_strtoul(buf, NULL, 10); \
\
mutex_lock(&data->update_lock); \
data->in_##reg[nr] = in_to_reg(val, nr); \
w83627ehf_write_value(client, W83627EHF_REG_IN_##REG(nr), \
data->in_##reg[nr]); \
mutex_unlock(&data->update_lock); \
return count; \
}

store_in_reg(MIN, min)
store_in_reg(MAX, max)

static struct sensor_device_attribute sda_in_input[] = {
SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
SENSOR_ATTR(in3_input, S_IRUGO, show_in, NULL, 3),
SENSOR_ATTR(in4_input, S_IRUGO, show_in, NULL, 4),
SENSOR_ATTR(in5_input, S_IRUGO, show_in, NULL, 5),
SENSOR_ATTR(in6_input, S_IRUGO, show_in, NULL, 6),
SENSOR_ATTR(in7_input, S_IRUGO, show_in, NULL, 7),
SENSOR_ATTR(in8_input, S_IRUGO, show_in, NULL, 8),
SENSOR_ATTR(in9_input, S_IRUGO, show_in, NULL, 9),
};

static struct sensor_device_attribute sda_in_min[] = {
SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
SENSOR_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 3),
SENSOR_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 4),
SENSOR_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 5),
SENSOR_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 6),
SENSOR_ATTR(in7_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 7),
SENSOR_ATTR(in8_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 8),
SENSOR_ATTR(in9_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 9),
};

static struct sensor_device_attribute sda_in_max[] = {
SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
SENSOR_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 3),
SENSOR_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 4),
SENSOR_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 5),
SENSOR_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 6),
SENSOR_ATTR(in7_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 7),
SENSOR_ATTR(in8_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 8),
SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
};

static void device_create_file_in(struct device *dev, int i)
{
device_create_file(dev, &sda_in_input[i].dev_attr);
device_create_file(dev, &sda_in_min[i].dev_attr);
device_create_file(dev, &sda_in_max[i].dev_attr);
}

#define show_fan_reg(reg) \
static ssize_t \
Expand Down Expand Up @@ -705,6 +818,9 @@ static int w83627ehf_detect(struct i2c_adapter *adapter)
goto exit_detach;
}

for (i = 0; i < 10; i++)
device_create_file_in(dev, i);

for (i = 0; i < 5; i++) {
if (data->has_fan & (1 << i))
device_create_file_fan(dev, i);
Expand Down

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