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Commit a86e94dc authored by Christophe Leroy's avatar Christophe Leroy Committed by Guenter Roeck
Browse files

hwmon: (lm70) Add support for LM71 and LM74 



Add support for LM74 and LM71 to LM70 driver.

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 367eb2ee

Documentation/hwmon/lm70

+9 −2
Original line number Diff line number Diff line
@@ -6,6 +6,10 @@ Supported chips: 
    Datasheet: http://www.national.com/pf/LM/LM70.html

  * Texas Instruments TMP121/TMP123

    Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html

  * National Semiconductor LM71

    Datasheet: http://www.ti.com/product/LM71

  * National Semiconductor LM74

    Datasheet: http://www.ti.com/product/LM74



Author:

        Kaiwan N Billimoria <kaiwan@designergraphix.com>
@@ -31,8 +35,11 @@ As a real (in-tree) example of this "SPI protocol driver" interfacing 
with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c

and its associated documentation.



The TMP121/TMP123 are very similar; main difference is 13-bit temperature

data (0.0625 degrees celsius resolution).

The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit

temperature data (0.0625 degrees celsius resolution).



The LM71 is also very similar; main difference is 14-bit temperature

data (0.03125 degrees celsius resolution).



Thanks to

---------

drivers/hwmon/Kconfig

+3 −3
Original line number Diff line number Diff line
@@ -560,12 +560,12 @@ config SENSORS_LM63 
	  will be called lm63.



config SENSORS_LM70

	tristate "National Semiconductor LM70 / Texas Instruments TMP121"

	tristate "National Semiconductor LM70 and compatibles"

	depends on SPI_MASTER

	help

	  If you say yes here you get support for the National Semiconductor

	  LM70 and Texas Instruments TMP121/TMP123 digital temperature

	  sensor chips.

	  LM70, LM71, LM74 and Texas Instruments TMP121/TMP123 digital tempera-

	  ture sensor chips.



	  This driver can also be built as a module.  If so, the module

	  will be called lm70.

drivers/hwmon/lm70.c

+22 −3
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 


#define LM70_CHIP_LM70		0	/* original NS LM70 */

#define LM70_CHIP_TMP121	1	/* TI TMP121/TMP123 */

#define LM70_CHIP_LM71		2	/* NS LM71 */

#define LM70_CHIP_LM74		3	/* NS LM74 */



struct lm70 {

	struct device *hwmon_dev;
@@ -88,9 +90,13 @@ static ssize_t lm70_sense_temp(struct device *dev, 
	 * Celsius.

	 * So it's equivalent to multiplying by 0.25 * 1000 = 250.

	 *

	 * TMP121/TMP123:

	 * LM74 and TMP121/TMP123:

	 * 13 bits of 2's complement data, discard LSB 3 bits,

	 * resolution 0.0625 degrees celsius.

	 *

	 * LM71:

	 * 14 bits of 2's complement data, discard LSB 2 bits,

	 * resolution 0.0312 degrees celsius.

	 */

	switch (p_lm70->chip) {

	case LM70_CHIP_LM70:
@@ -98,8 +104,13 @@ static ssize_t lm70_sense_temp(struct device *dev, 
		break;



	case LM70_CHIP_TMP121:

	case LM70_CHIP_LM74:

		val = ((int)raw / 8) * 625 / 10;

		break;



	case LM70_CHIP_LM71:

		val = ((int)raw / 4) * 3125 / 100;

		break;

	}



	status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
@@ -123,6 +134,12 @@ static ssize_t lm70_show_name(struct device *dev, struct device_attribute 
	case LM70_CHIP_TMP121:

		ret = sprintf(buf, "tmp121\n");

		break;

	case LM70_CHIP_LM71:

		ret = sprintf(buf, "lm71\n");

		break;

	case LM70_CHIP_LM74:

		ret = sprintf(buf, "lm74\n");

		break;

	default:

		ret = -EINVAL;

	}
@@ -139,7 +156,7 @@ static int __devinit lm70_probe(struct spi_device *spi) 
	struct lm70 *p_lm70;

	int status;



	/* signaling is SPI_MODE_0 for both LM70 and TMP121 */

	/* signaling is SPI_MODE_0 */

	if (spi->mode & (SPI_CPOL | SPI_CPHA))

		return -EINVAL;
@@ -196,6 +213,8 @@ static int __devexit lm70_remove(struct spi_device *spi) 
static const struct spi_device_id lm70_ids[] = {

	{ "lm70",   LM70_CHIP_LM70 },

	{ "tmp121", LM70_CHIP_TMP121 },

	{ "lm71",   LM70_CHIP_LM71 },

	{ "lm74",   LM70_CHIP_LM74 },

	{ },

};

MODULE_DEVICE_TABLE(spi, lm70_ids);
@@ -213,5 +232,5 @@ static struct spi_driver lm70_driver = { 
module_spi_driver(lm70_driver);



MODULE_AUTHOR("Kaiwan N Billimoria");

MODULE_DESCRIPTION("NS LM70 / TI TMP121/TMP123 Linux driver");

MODULE_DESCRIPTION("NS LM70 and compatibles Linux driver");

MODULE_LICENSE("GPL");