Commit 210961c4 authored by Guenter Roeck's avatar Guenter Roeck Committed by Jean Delvare
Browse files

hwmon: (lm63) Add support for LM96163 



LM96163 is an enhanced version of LM63 with improved PWM resolution. Add chip
detection code as well as support for improved PWM resolution if the chip is
configured to use it.

Signed-off-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
Tested-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 786375f7

Documentation/hwmon/lm63

+8 −0
Original line number Diff line number Diff line
@@ -12,6 +12,11 @@ Supported chips: 
    Addresses scanned: I2C 0x18 and 0x4e

    Datasheet: Publicly available at the National Semiconductor website

               http://www.national.com/pf/LM/LM64.html

  * National Semiconductor LM96163

    Prefix: 'lm96163'

    Addresses scanned: I2C 0x4c

    Datasheet: Publicly available at the National Semiconductor website

               http://www.national.com/pf/LM/LM96163.html



Author: Jean Delvare <khali@linux-fr.org>
@@ -62,3 +67,6 @@ values. 


The LM64 is effectively an LM63 with GPIO lines. The driver does not

support these GPIO lines at present.



The LM96163 is an enhanced version of LM63 with improved temperature accuracy

and better PWM resolution.

drivers/hwmon/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -515,11 +515,11 @@ config SENSORS_LINEAGE 
	  will be called lineage-pem.



config SENSORS_LM63

	tristate "National Semiconductor LM63 and LM64"

	tristate "National Semiconductor LM63 and compatibles"

	depends on I2C

	help

	  If you say yes here you get support for the National

	  Semiconductor LM63 and LM64 remote diode digital temperature

	  Semiconductor LM63, LM64, and LM96163 remote diode digital temperature

	  sensors with integrated fan control.  Such chips are found

	  on the Tyan S4882 (Thunder K8QS Pro) motherboard, among

	  others.

drivers/hwmon/lm63.c

+36 −5
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ 
#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

#include <linux/types.h>



/*

 * Addresses to scan
@@ -91,6 +92,8 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END }; 
#define LM63_REG_MAN_ID			0xFE

#define LM63_REG_CHIP_ID		0xFF



#define LM96163_REG_CONFIG_ENHANCED	0x45



/*

 * Conversions and various macros

 * For tachometer counts, the LM63 uses 16-bit values.
@@ -134,7 +137,7 @@ static struct lm63_data *lm63_update_device(struct device *dev); 
static int lm63_detect(struct i2c_client *client, struct i2c_board_info *info);

static void lm63_init_client(struct i2c_client *client);



enum chips { lm63, lm64 };

enum chips { lm63, lm64, lm96163 };



/*

 * Driver data (common to all clients)
@@ -143,6 +146,7 @@ enum chips { lm63, lm64 }; 
static const struct i2c_device_id lm63_id[] = {

	{ "lm63", lm63 },

	{ "lm64", lm64 },

	{ "lm96163", lm96163 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, lm63_id);
@@ -186,6 +190,7 @@ struct lm63_data { 
			   3: remote offset */

	u8 temp2_crit_hyst;

	u8 alarms;

	bool pwm_highres;

};



/*
@@ -226,9 +231,16 @@ static ssize_t show_pwm1(struct device *dev, struct device_attribute *dummy, 
			 char *buf)

{

	struct lm63_data *data = lm63_update_device(dev);

	return sprintf(buf, "%d\n", data->pwm1_value >= 2 * data->pwm1_freq ?

	int pwm;



	if (data->pwm_highres)

		pwm = data->pwm1_value;

	else

		pwm = data->pwm1_value >= 2 * data->pwm1_freq ?

		       255 : (data->pwm1_value * 255 + data->pwm1_freq) /

		       (2 * data->pwm1_freq));

		       (2 * data->pwm1_freq);



	return sprintf(buf, "%d\n", pwm);

}



static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy,
@@ -246,9 +258,9 @@ static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy, 
	if (err)

		return err;



	val = SENSORS_LIMIT(val, 0, 255);

	mutex_lock(&data->update_lock);

	data->pwm1_value = val <= 0 ? 0 :

			   val >= 255 ? 2 * data->pwm1_freq :

	data->pwm1_value = data->pwm_highres ? val :

			   (val * data->pwm1_freq * 2 + 127) / 255;

	i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1_value);

	mutex_unlock(&data->update_lock);
@@ -522,6 +534,8 @@ static int lm63_detect(struct i2c_client *new_client, 
		strlcpy(info->type, "lm63", I2C_NAME_SIZE);

	else if (chip_id == 0x51 && (address == 0x18 || address == 0x4e))

		strlcpy(info->type, "lm64", I2C_NAME_SIZE);

	else if (chip_id == 0x49 && address == 0x4c)

		strlcpy(info->type, "lm96163", I2C_NAME_SIZE);

	else

		return -ENODEV;
@@ -605,6 +619,23 @@ static void lm63_init_client(struct i2c_client *client) 
	if (data->pwm1_freq == 0)

		data->pwm1_freq = 1;



	/*

	 * For LM96163, check if high resolution PWM is enabled.

	 * Also, check if unsigned temperature format is enabled

	 * and display a warning message if it is.

	 */

	if (data->kind == lm96163) {

		u8 config_enhanced

		  = i2c_smbus_read_byte_data(client,

					     LM96163_REG_CONFIG_ENHANCED);

		if ((config_enhanced & 0x10)

		    && !(data->config_fan & 0x08) && data->pwm1_freq == 8)

			data->pwm_highres = true;

		if (config_enhanced & 0x08)

			dev_warn(&client->dev,

				 "Unsigned format for High and Crit setpoints enabled but not supported by driver\n");

	}



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

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

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

CRA Git | Maintained and supported by SUSTech CRA and CCSE