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72 lines
2.3 KiB
Diff
72 lines
2.3 KiB
Diff
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From 31d8f414e1596ba54a4315418e4c0086fda9e428 Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Fri, 18 Feb 2022 10:06:43 +0100
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Subject: hwmon: (lm70) Add ti,tmp125 support
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The TMP125 is a 2 degree Celsius accurate Digital
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Temperature Sensor with a SPI interface.
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The temperature register is a 16-bit, read-only register.
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The MSB (Bit 15) is a leading zero and never set. Bits 14
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to 5 are the 1+9 temperature data bits in a two's
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complement format. Bits 4 to 0 are useless copies of
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Bit 5 value and therefore ignored.
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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Link: https://lore.kernel.org/r/43b19cbd4e7f51e9509e561b02b5d8d0e7079fac.1645175187.git.chunkeey@gmail.com
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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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---
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--- a/drivers/hwmon/lm70.c
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+++ b/drivers/hwmon/lm70.c
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@@ -34,6 +34,7 @@
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#define LM70_CHIP_LM71 2 /* NS LM71 */
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#define LM70_CHIP_LM74 3 /* NS LM74 */
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#define LM70_CHIP_TMP122 4 /* TI TMP122/TMP124 */
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+#define LM70_CHIP_TMP125 5 /* TI TMP125 */
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struct lm70 {
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struct spi_device *spi;
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@@ -87,6 +88,12 @@ static ssize_t temp1_input_show(struct d
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* LM71:
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* 14 bits of 2's complement data, discard LSB 2 bits,
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* resolution 0.0312 degrees celsius.
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+ *
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+ * TMP125:
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+ * MSB/D15 is a leading zero. D14 is the sign-bit. This is
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+ * followed by 9 temperature bits (D13..D5) in 2's complement
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+ * data format with a resolution of 0.25 degrees celsius per unit.
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+ * LSB 5 bits (D4..D0) share the same value as D5 and get discarded.
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*/
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switch (p_lm70->chip) {
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case LM70_CHIP_LM70:
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@@ -102,6 +109,10 @@ static ssize_t temp1_input_show(struct d
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case LM70_CHIP_LM71:
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val = ((int)raw / 4) * 3125 / 100;
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break;
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+
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+ case LM70_CHIP_TMP125:
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+ val = (sign_extend32(raw, 14) / 32) * 250;
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+ break;
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}
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status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
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@@ -136,6 +147,10 @@ static const struct of_device_id lm70_of
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.data = (void *) LM70_CHIP_TMP122,
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},
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{
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+ .compatible = "ti,tmp125",
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+ .data = (void *) LM70_CHIP_TMP125,
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+ },
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+ {
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.compatible = "ti,lm71",
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.data = (void *) LM70_CHIP_LM71,
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},
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@@ -184,6 +199,7 @@ static const struct spi_device_id lm70_i
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{ "lm70", LM70_CHIP_LM70 },
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{ "tmp121", LM70_CHIP_TMP121 },
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{ "tmp122", LM70_CHIP_TMP122 },
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+ { "tmp125", LM70_CHIP_TMP125 },
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{ "lm71", LM70_CHIP_LM71 },
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{ "lm74", LM70_CHIP_LM74 },
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{ },
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