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hwmon: (it87) Verify the VID pin usage

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The VID input pins can alternatively be used as GPIOs. Make sure we
have at least 4 pins used for VID, otherwise don't bother reading and
exposing VID.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Adam Nielsen <a.nielsen@shikadi.net>
This commit is contained in:
Jean Delvare 2009-12-09 20:35:47 +01:00
parent f7290e24e3
commit 895ff26768
2 changed files with 16 additions and 5 deletions
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1
Documentation/hwmon/it87
View file

@ -86,7 +86,6 @@ The IT8712F and IT8716F additionally feature VID inputs, used to report
the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
the IT8716F and late IT8712F have 6. They are shared with other functions
though, so the functionality may not be available on a given system.
The driver dumbly assume it is there.
The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value
is stored in the Super-I/O configuration space. Due to technical limitations,

20
drivers/hwmon/it87.c
View file

@ -124,6 +124,7 @@ superio_exit(void)
#define IT87_BASE_REG 0x60
/* Logical device 7 registers (IT8712F and later) */
#define IT87_SIO_GPIO3_REG 0x27
#define IT87_SIO_PINX2_REG 0x2c /* Pin selection */
#define IT87_SIO_VID_REG 0xfc /* VID value */
@ -244,6 +245,7 @@ struct it87_sio_data {
/* Values read from Super-I/O config space */
u8 revision;
u8 vid_value;
u8 skip_vid;
/* Values set based on DMI strings */
u8 skip_pwm;
};
@ -1028,11 +1030,22 @@ static int __init it87_find(unsigned short *address,
chip_type, *address, sio_data->revision);
/* Read GPIO config and VID value from LDN 7 (GPIO) */
if (sio_data->type != it87) {
if (sio_data->type == it87) {
/* The IT8705F doesn't have VID pins at all */
sio_data->skip_vid = 1;
} else {
int reg;
superio_select(GPIO);
if (sio_data->type == it8718 || sio_data->type == it8720)
/* We need at least 4 VID pins */
reg = superio_inb(IT87_SIO_GPIO3_REG);
if (reg & 0x0f) {
pr_info("it87: VID is disabled (pins used for GPIO)\n");
sio_data->skip_vid = 1;
}
if ((sio_data->type == it8718 || sio_data->type == it8720)
&& !(sio_data->skip_vid))
sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
reg = superio_inb(IT87_SIO_PINX2_REG);
@ -1236,8 +1249,7 @@ static int __devinit it87_probe(struct platform_device *pdev)
}
}
if (data->type == it8712 || data->type == it8716
|| data->type == it8718 || data->type == it8720) {
if (!sio_data->skip_vid) {
data->vrm = vid_which_vrm();
/* VID reading from Super-I/O config space if available */
data->vid = sio_data->vid_value;