From 409c0b5bdf7d80e61380ce6b226b98405576d7cc Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Mon, 16 Jan 2012 22:51:46 +0100 Subject: [PATCH] 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: Jean Delvare Acked-by: Guenter Roeck --- Documentation/hwmon/lm63 | 5 ++++- drivers/hwmon/lm63.c | 10 +++++++--- 2 files changed, 11 insertions(+), 4 deletions(-) diff --git a/Documentation/hwmon/lm63 b/Documentation/hwmon/lm63 index 8202825..df3e1ae 100644 --- a/Documentation/hwmon/lm63 +++ b/Documentation/hwmon/lm63 @@ -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 diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c index 75e3a15..0c4fff0 100644 --- a/drivers/hwmon/lm63.c +++ b/drivers/hwmon/lm63.c @@ -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); @@ -836,9 +839,10 @@ static void lm63_init_client(struct i2c_client *client) } /* Show some debug info about the LM63 configuration */ - dev_dbg(&client->dev, "Alert/tach pin configured for %s\n", - (data->config & 0x04) ? "tachometer input" : - "alert output"); + if (data->kind == lm63) + dev_dbg(&client->dev, "Alert/tach pin configured for %s\n", + (data->config & 0x04) ? "tachometer input" : + "alert output"); dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n", (data->config_fan & 0x08) ? "1.4" : "360", ((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq); -- 1.9.1