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hwmon: (lm70) Add support for TI TMP122/124

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Add support for Texas Instruments TMP122/124 which are nearly identical to
their TMP121/123 except that they also support programmable temperature
thresholds.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Florian Fainelli 2017-01-21 11:20:10 -08:00 committed by Guenter Roeck
parent e829514650
commit 68f0c8c923
3 changed files with 15 additions and 3 deletions
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1
Documentation/devicetree/bindings/hwmon/lm70.txt
View File

@ -4,6 +4,7 @@ Required properties:
- compatible: one of
"ti,lm70"
"ti,tmp121"
"ti,tmp122"
"ti,lm71"
"ti,lm74"

8
Documentation/hwmon/lm70
View File

@ -6,6 +6,8 @@ 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
* Texas Instruments TMP122/TMP124
Information: http://www.ti.com/product/tmp122
* National Semiconductor LM71
Datasheet: http://www.ti.com/product/LM71
* National Semiconductor LM74
@ -35,8 +37,10 @@ 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 LM74 and TMP121/TMP123 are very similar; main difference is 13-bit
temperature data (0.0625 degrees celsius resolution).
The LM74 and TMP121/TMP122/TMP123/TMP124 are very similar; main difference is
13-bit temperature data (0.0625 degrees celsius resolution).
The TMP122/TMP124 also feature configurable temperature thresholds.
The LM71 is also very similar; main difference is 14-bit temperature
data (0.03125 degrees celsius resolution).

9
drivers/hwmon/lm70.c
View File

@ -46,6 +46,7 @@
#define LM70_CHIP_TMP121 1 /* TI TMP121/TMP123 */
#define LM70_CHIP_LM71 2 /* NS LM71 */
#define LM70_CHIP_LM74 3 /* NS LM74 */
#define LM70_CHIP_TMP122 4 /* TI TMP122/TMP124 */
struct lm70 {
struct spi_device *spi;
@ -92,7 +93,7 @@ static ssize_t temp1_input_show(struct device *dev,
* Celsius.
* So it's equivalent to multiplying by 0.25 * 1000 = 250.
*
* LM74 and TMP121/TMP123:
* LM74 and TMP121/TMP122/TMP123/TMP124:
* 13 bits of 2's complement data, discard LSB 3 bits,
* resolution 0.0625 degrees celsius.
*
@ -106,6 +107,7 @@ static ssize_t temp1_input_show(struct device *dev,
break;
case LM70_CHIP_TMP121:
case LM70_CHIP_TMP122:
case LM70_CHIP_LM74:
val = ((int)raw / 8) * 625 / 10;
break;
@ -142,6 +144,10 @@ static const struct of_device_id lm70_of_ids[] = {
.compatible = "ti,tmp121",
.data = (void *) LM70_CHIP_TMP121,
},
{
.compatible = "ti,tmp122",
.data = (void *) LM70_CHIP_TMP122,
},
{
.compatible = "ti,lm71",
.data = (void *) LM70_CHIP_LM71,
@ -191,6 +197,7 @@ static int lm70_probe(struct spi_device *spi)
static const struct spi_device_id lm70_ids[] = {
{ "lm70", LM70_CHIP_LM70 },
{ "tmp121", LM70_CHIP_TMP121 },
{ "tmp122", LM70_CHIP_TMP122 },
{ "lm71", LM70_CHIP_LM71 },
{ "lm74", LM70_CHIP_LM74 },
{ },