Commit 6593eac8 authored by Frank Crawford's avatar Frank Crawford Committed by Guenter Roeck
Browse files

hwmon: (it87) Add support to detect sensor type AMDTSI 



Add test for sensor type AMDTSI which is available on certain recent
chipsets.

Signed-off-by: default avatarFrank Crawford <frank@crawford.emu.id.au>
Link: https://lore.kernel.org/r/20230707123005.956415-4-frank@crawford.emu.id.au


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 2f60e593

drivers/hwmon/it87.c

+31 −4
Original line number Diff line number Diff line
@@ -221,6 +221,10 @@ static bool fix_pwm_polarity; 
 * Super-I/O configuration space.

 */

#define IT87_REG_VID           0x0a



/* Interface Selection register on other chips */

#define IT87_REG_IFSEL         0x0a



/*

 * The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b

 * for fan divisors. Later IT8712F revisions must use 16-bit tachometer
@@ -1170,14 +1174,37 @@ static int get_temp_type(struct it87_data *data, int index) 
	 * 0 = disabled

	 */

	u8 reg, extra;

	int type = 0;

	int ttype, type = 0;



	/* Detect PECI vs. AMDTSI */

	ttype = 6;

	if ((has_temp_peci(data, index)) || data->type == it8721 ||

	    data->type == it8720) {

		extra = it87_read_value(data, IT87_REG_IFSEL);

		if ((extra & 0x70) == 0x40)

			ttype = 5;

	}



	reg = data->sensor;	/* In case value is updated while used */

	extra = data->extra;

	reg = it87_read_value(data, IT87_REG_TEMP_ENABLE);



	/* Per chip special detection */

	switch (data->type) {

	case it8622:

		if (!(reg & 0xc0) && index == 3)

			type = ttype;

		break;

	default:

		break;

	}



	if (type || index >= 3)

		return type;



	extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);



	if ((has_temp_peci(data, index) && (reg >> 6 == index + 1)) ||

	    (has_temp_old_peci(data, index) && (extra & 0x80)))

		type = 6;	/* Intel PECI */

		type = ttype;	/* Intel PECI or AMDTSI */

	else if (reg & BIT(index))

		type = 3;	/* thermal diode */

	else if (reg & BIT(index + 3))