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hwmon: (it87) Add IT8728F support
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Until we get a datasheet for the IT8728F, treat it as fully compatible
with the IT8721F, as it seems to work reasonably well.

This closes kernel bug #27262.

Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
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Jean Delvare authored and Jean Delvare committed Jan 16, 2012
1 parent d6db23c commit 16b5dda
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13 changes: 10 additions & 3 deletions Documentation/hwmon/it87
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,10 @@ Supported chips:
Prefix: 'it8721'
Addresses scanned: from Super I/O config space (8 I/O ports)
Datasheet: Not publicly available
* IT8728F
Prefix: 'it8728'
Addresses scanned: from Super I/O config space (8 I/O ports)
Datasheet: Not publicly available
* SiS950 [clone of IT8705F]
Prefix: 'it87'
Addresses scanned: from Super I/O config space (8 I/O ports)
Expand Down Expand Up @@ -71,7 +75,7 @@ Description
-----------

This driver implements support for the IT8705F, IT8712F, IT8716F,
IT8718F, IT8720F, IT8721F, IT8726F, IT8758E and SiS950 chips.
IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E and SiS950 chips.

These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
joysticks and other miscellaneous stuff. For hardware monitoring, they
Expand Down Expand Up @@ -105,6 +109,9 @@ The IT8726F is just bit enhanced IT8716F with additional hardware
for AMD power sequencing. Therefore the chip will appear as IT8716F
to userspace applications.

The IT8728F is considered compatible with the IT8721F, until a datasheet
becomes available (hopefully.)

Temperatures are measured in degrees Celsius. An alarm is triggered once
when the Overtemperature Shutdown limit is crossed.

Expand All @@ -121,8 +128,8 @@ alarm is triggered if the voltage has crossed a programmable minimum or
maximum limit. Note that minimum in this case always means 'closest to
zero'; this is important for negative voltage measurements. All voltage
inputs can measure voltages between 0 and 4.08 volts, with a resolution of
0.016 volt (except IT8721F/IT8758E: 0.012 volt.) The battery voltage in8 does
not have limit registers.
0.016 volt (except IT8721F/IT8758E and IT8728F: 0.012 volt.) The battery
voltage in8 does not have limit registers.

On the IT8721F/IT8758E, some voltage inputs are internal and scaled inside
the chip (in7, in8 and optionally in3). The driver handles this transparently
Expand Down
4 changes: 2 additions & 2 deletions drivers/hwmon/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -474,8 +474,8 @@ config SENSORS_IT87
select HWMON_VID
help
If you say yes here you get support for ITE IT8705F, IT8712F,
IT8716F, IT8718F, IT8720F, IT8721F, IT8726F and IT8758E sensor
chips, and the SiS960 clone.
IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F and IT8758E
sensor chips, and the SiS960 clone.

This driver can also be built as a module. If so, the module
will be called it87.
Expand Down
61 changes: 46 additions & 15 deletions drivers/hwmon/it87.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
* IT8720F Super I/O chip w/LPC interface
* IT8721F Super I/O chip w/LPC interface
* IT8726F Super I/O chip w/LPC interface
* IT8728F Super I/O chip w/LPC interface
* IT8758E Super I/O chip w/LPC interface
* Sis950 A clone of the IT8705F
*
Expand Down Expand Up @@ -58,7 +59,7 @@

#define DRVNAME "it87"

enum chips { it87, it8712, it8716, it8718, it8720, it8721 };
enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728 };

static unsigned short force_id;
module_param(force_id, ushort, 0);
Expand Down Expand Up @@ -135,6 +136,7 @@ static inline void superio_exit(void)
#define IT8720F_DEVID 0x8720
#define IT8721F_DEVID 0x8721
#define IT8726F_DEVID 0x8726
#define IT8728F_DEVID 0x8728
#define IT87_ACT_REG 0x30
#define IT87_BASE_REG 0x60

Expand Down Expand Up @@ -274,11 +276,31 @@ struct it87_data {
s8 auto_temp[3][5]; /* [nr][0] is point1_temp_hyst */
};

static inline int has_12mv_adc(const struct it87_data *data)
{
/*
* IT8721F and later have a 12 mV ADC, also with internal scaling
* on selected inputs.
*/
return data->type == it8721
|| data->type == it8728;
}

static inline int has_newer_autopwm(const struct it87_data *data)
{
/*
* IT8721F and later have separate registers for the temperature
* mapping and the manual duty cycle.
*/
return data->type == it8721
|| data->type == it8728;
}

static u8 in_to_reg(const struct it87_data *data, int nr, long val)
{
long lsb;

if (data->type == it8721) {
if (has_12mv_adc(data)) {
if (data->in_scaled & (1 << nr))
lsb = 24;
else
Expand All @@ -292,7 +314,7 @@ static u8 in_to_reg(const struct it87_data *data, int nr, long val)

static int in_from_reg(const struct it87_data *data, int nr, int val)
{
if (data->type == it8721) {
if (has_12mv_adc(data)) {
if (data->in_scaled & (1 << nr))
return val * 24;
else
Expand Down Expand Up @@ -329,15 +351,15 @@ static inline u16 FAN16_TO_REG(long rpm)

static u8 pwm_to_reg(const struct it87_data *data, long val)
{
if (data->type == it8721)
if (has_newer_autopwm(data))
return val;
else
return val >> 1;
}

static int pwm_from_reg(const struct it87_data *data, u8 reg)
{
if (data->type == it8721)
if (has_newer_autopwm(data))
return reg;
else
return (reg & 0x7f) << 1;
Expand Down Expand Up @@ -374,7 +396,8 @@ static inline int has_16bit_fans(const struct it87_data *data)
|| data->type == it8716
|| data->type == it8718
|| data->type == it8720
|| data->type == it8721;
|| data->type == it8721
|| data->type == it8728;
}

static inline int has_old_autopwm(const struct it87_data *data)
Expand Down Expand Up @@ -842,7 +865,7 @@ static ssize_t set_pwm_enable(struct device *dev,
data->fan_main_ctrl);
} else {
if (val == 1) /* Manual mode */
data->pwm_ctrl[nr] = data->type == it8721 ?
data->pwm_ctrl[nr] = has_newer_autopwm(data) ?
data->pwm_temp_map[nr] :
data->pwm_duty[nr];
else /* Automatic mode */
Expand Down Expand Up @@ -870,7 +893,7 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
return -EINVAL;

mutex_lock(&data->update_lock);
if (data->type == it8721) {
if (has_newer_autopwm(data)) {
/* If we are in automatic mode, the PWM duty cycle register
* is read-only so we can't write the value */
if (data->pwm_ctrl[nr] & 0x80) {
Expand Down Expand Up @@ -1311,8 +1334,8 @@ static ssize_t show_label(struct device *dev, struct device_attribute *attr,
struct it87_data *data = dev_get_drvdata(dev);
int nr = to_sensor_dev_attr(attr)->index;

return sprintf(buf, "%s\n", data->type == it8721 ? labels_it8721[nr]
: labels[nr]);
return sprintf(buf, "%s\n", has_12mv_adc(data) ? labels_it8721[nr]
: labels[nr]);
}
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 0);
static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_label, NULL, 1);
Expand Down Expand Up @@ -1605,6 +1628,9 @@ static int __init it87_find(unsigned short *address,
case IT8721F_DEVID:
sio_data->type = it8721;
break;
case IT8728F_DEVID:
sio_data->type = it8728;
break;
case 0xffff: /* No device at all */
goto exit;
default:
Expand Down Expand Up @@ -1646,8 +1672,11 @@ static int __init it87_find(unsigned short *address,
superio_select(GPIO);

reg = superio_inb(IT87_SIO_GPIO3_REG);
if (sio_data->type == it8721) {
/* The IT8721F/IT8758E doesn't have VID pins at all */
if (sio_data->type == it8721 || sio_data->type == it8728) {
/*
* The IT8721F/IT8758E doesn't have VID pins at all,
* not sure about the IT8728F.
*/
sio_data->skip_vid = 1;
} else {
/* We need at least 4 VID pins */
Expand Down Expand Up @@ -1692,7 +1721,8 @@ static int __init it87_find(unsigned short *address,
}
if (reg & (1 << 0))
sio_data->internal |= (1 << 0);
if ((reg & (1 << 1)) || sio_data->type == it8721)
if ((reg & (1 << 1)) || sio_data->type == it8721 ||
sio_data->type == it8728)
sio_data->internal |= (1 << 1);

sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
Expand Down Expand Up @@ -1770,6 +1800,7 @@ static int __devinit it87_probe(struct platform_device *pdev)
"it8718",
"it8720",
"it8721",
"it8728",
};

res = platform_get_resource(pdev, IORESOURCE_IO, 0);
Expand Down Expand Up @@ -1807,7 +1838,7 @@ static int __devinit it87_probe(struct platform_device *pdev)
enable_pwm_interface = it87_check_pwm(dev);

/* Starting with IT8721F, we handle scaling of internal voltages */
if (data->type == it8721) {
if (has_12mv_adc(data)) {
if (sio_data->internal & (1 << 0))
data->in_scaled |= (1 << 3); /* in3 is AVCC */
if (sio_data->internal & (1 << 1))
Expand Down Expand Up @@ -2093,7 +2124,7 @@ static void __devinit it87_init_device(struct platform_device *pdev)
static void it87_update_pwm_ctrl(struct it87_data *data, int nr)
{
data->pwm_ctrl[nr] = it87_read_value(data, IT87_REG_PWM(nr));
if (data->type == it8721) {
if (has_newer_autopwm(data)) {
data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03;
data->pwm_duty[nr] = it87_read_value(data,
IT87_REG_PWM_DUTY(nr));
Expand Down

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