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Commit 409c0b5b authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (lm63) LM64 has a dedicated pin for tachometer 



On the LM64, the tachometer function has a dedicated pin and fan speed
monitoring is always enabled.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
parent f496b2d4

Documentation/hwmon/lm63

+4 −1
Original line number Diff line number Diff line
@@ -54,7 +54,10 @@ value for measuring the speed of the fan. It can measure fan speeds down to 
Note that the pin used for fan monitoring is shared with an alert out

function. Depending on how the board designer wanted to use the chip, fan

speed monitoring will or will not be possible. The proper chip configuration

is left to the BIOS, and the driver will blindly trust it.

is left to the BIOS, and the driver will blindly trust it. Only the original

LM63 suffers from this limitation, the LM64 and LM96163 have separate pins

for fan monitoring and alert out. On the LM64, monitoring is always enabled;

on the LM96163 it can be disabled.



A PWM output can be used to control the speed of the fan. The LM63 has two

PWM modes: manual and automatic. Automatic mode is not fully implemented yet

drivers/hwmon/lm63.c

+7 −3
Original line number Diff line number Diff line
@@ -796,6 +796,9 @@ static void lm63_init_client(struct i2c_client *client) 
		i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,

					  data->config);

	}

	/* Tachometer is always enabled on LM64 */

	if (data->kind == lm64)

		data->config |= 0x04;



	/* We may need pwm1_freq before ever updating the client data */

	data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
@@ -836,6 +839,7 @@ static void lm63_init_client(struct i2c_client *client) 
	}



	/* Show some debug info about the LM63 configuration */

	if (data->kind == lm63)

		dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",

			(data->config & 0x04) ? "tachometer input" :

			"alert output");