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Commit 816d8c6a authored by Andrew Paprocki's avatar Andrew Paprocki Committed by Jean Delvare
Browse files

hwmon: (it87) Support for 16-bit fan reading in it8705 >= rev 0x03 



The it8705 chip supports 16-bit fan tachometers in revisions at least
>= 0x03 (Version G). This patch enables 16-bit fan readings on all
revisions >= 0x03 just like the it8712, it8716, and it8718 chips.

Signed-off-by: default avatarAndrew Paprocki <andrew@ishiboo.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 0475169c

Documentation/hwmon/it87

+3 −3
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ Supported chips: 
    Prefix: 'it87'

    Addresses scanned: from Super I/O config space (8 I/O ports)

    Datasheet: Publicly available at the ITE website

               http://www.ite.com.tw/

               http://www.ite.com.tw/product_info/file/pc/IT8705F_V.0.4.1.pdf

  * IT8712F

    Prefix: 'it8712'

    Addresses scanned: from Super I/O config space (8 I/O ports)
@@ -97,8 +97,8 @@ The IT8716F, IT8718F and later IT8712F revisions have support for 
The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional

16-bit tachometer counters for fans 1 to 3. This is better (no more fan

clock divider mess) but not compatible with the older chips and

revisions. For now, the driver only uses the 16-bit mode on the

late IT8712F, IT8716F and IT8718F.

revisions. The 16-bit tachometer mode is enabled by the driver when one

of the above chips is detected.



The IT8726F is just bit enhanced IT8716F with additional hardware

for AMD power sequencing. Therefore the chip will appear as IT8716F

drivers/hwmon/it87.c

+12 −7
Original line number Diff line number Diff line
@@ -272,9 +272,11 @@ struct it87_data { 


static inline int has_16bit_fans(const struct it87_data *data)

{

	/* IT8712F Datasheet 0.9.1, section 8.3.5 indicates 7h == Version I.

	   This is the first revision with 16bit tachometer support. */

	return (data->type == it8712 && data->revision >= 0x07)

	/* IT8705F Datasheet 0.4.1, 3h == Version G.

	   IT8712F Datasheet 0.9.1, section 8.3.5 indicates 7h == Version I.

	   These are the first revisions with 16bit tachometer support. */

	return (data->type == it87 && data->revision >= 0x03)

	    || (data->type == it8712 && data->revision >= 0x07)

	    || data->type == it8716

	    || data->type == it8718;

}
@@ -1370,11 +1372,14 @@ static void __devinit it87_init_device(struct platform_device *pdev) 
			it87_write_value(data, IT87_REG_FAN_16BIT,

					 tmp | 0x07);

		}

		/* IT8705F only supports three fans. */

		if (data->type != it87) {

			if (tmp & (1 << 4))

				data->has_fan |= (1 << 3); /* fan4 enabled */

			if (tmp & (1 << 5))

				data->has_fan |= (1 << 4); /* fan5 enabled */

		}

	}



	/* Set current fan mode registers and the default settings for the

	 * other mode registers */