hwmon: (lm70) Add support for LM71 and LM74 (a86e94dc) · Commits · 戴 / test

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");

Admin message