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kernel: backport lm63 enhancements

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This was a pending patch before, it has been accepted by upstream.

The patch exposes the PWM frequency and temperature hysteresis values for the
LM63 fan controller.

Signed-off-by: Jan-Henrik Bruhn <git@jhbruhn.de>
Link: https://github.com/openwrt/openwrt/pull/23525
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
This commit is contained in:
Jan-Henrik Bruhn
2026-05-25 10:37:11 +02:00
committed by Jonas Jelonek
parent 96b9e8130f
commit 89ef8aaf3e
1 changed files with 62 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files
target/linux/generic/pending-6.18/842-hwmon-lm63-make-pwm1_freq-and-lut-hyst-writable.patch → target/linux/generic/backport-6.18/842-v7.2-hwmon-lm63-make-pwm1_freq-and-lut-hyst-writable.patch
+62 -28
View File
@@ -1,6 +1,7 @@
From 70159b00aff8c26069f25db8638cbfca970e06a0 Mon Sep 17 00:00:00 2001
From: Jan-Henrik Bruhn <kernel@jhbruhn.de>
Date: Wed, 21 May 2026 00:00:00 +0200
Subject: [PATCH] hwmon: lm63: expose PWM frequency and LUT hysteresis as writable
Date: Sat, 23 May 2026 15:36:17 +0200
Subject: hwmon: (lm63) expose PWM frequency and LUT hysteresis as writable
The driver caches the PWM frequency register and the CONFIG_FAN slow-clock
select bit, but never lets userspace pick a different output frequency.
@@ -17,10 +18,22 @@ holding the hysteresis amount in millidegrees; the per-point attributes
stay RO and continue to show the resulting absolute trip-down
temperature for each entry.
This was tested on a Linksys LGS328MPC switch hardware where the fan
would not spin with the default PWM Frequency, which is why this change
is required.
Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
Link: https://lore.kernel.org/r/20260523133617.3439102-1-kernel@jhbruhn.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/lm63.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 133 insertions(+)
diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
index a0d77a7386a9d..e2a429e579ac1 100644
--- a/drivers/hwmon/lm63.c
+++ b/drivers/hwmon/lm63.c
@@ -92,6 +92,9 @@ static const unsigned short normal_i2c[]
@@ -92,6 +92,9 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
#define LM96163_REG_REMOTE_TEMP_U_LSB 0x32
#define LM96163_REG_CONFIG_ENHANCED 0x45
@@ -30,7 +43,7 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
#define LM63_MAX_CONVRATE 9
#define LM63_MAX_CONVRATE_HZ 32
@@ -447,6 +450,75 @@ static ssize_t pwm1_enable_store(struct
@@ -455,6 +458,91 @@ static ssize_t pwm1_enable_store(struct device *dev,
return count;
}
@@ -38,10 +51,15 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ struct device_attribute *dummy, char *buf)
+{
+ struct lm63_data *data = lm63_update_device(dev);
+ unsigned int base = (data->config_fan & 0x08) ?
+ LM63_PWM_BASE_SLOW_HZ : LM63_PWM_BASE_FAST_HZ;
+ unsigned int base, freq;
+
+ return sprintf(buf, "%u\n", base / data->pwm1_freq);
+ mutex_lock(&data->update_lock);
+ base = (data->config_fan & 0x08) ?
+ LM63_PWM_BASE_SLOW_HZ : LM63_PWM_BASE_FAST_HZ;
+ freq = data->pwm1_freq;
+ mutex_unlock(&data->update_lock);
+
+ return sprintf(buf, "%u\n", base / freq);
+}
+
+/*
@@ -58,14 +76,11 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ struct i2c_client *client = data->client;
+ unsigned long val, pfr_fast, pfr_slow, err_fast, err_slow, pfr;
+ bool slow_clock;
+ int err;
+ int ret;
+
+ if (!(data->config_fan & 0x20)) /* register is read-only */
+ return -EPERM;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+ ret = kstrtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+ if (val == 0)
+ return -EINVAL;
+
@@ -85,7 +100,27 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ }
+
+ mutex_lock(&data->update_lock);
+ data->config_fan = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG_FAN);
+ ret = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG_FAN);
+ if (ret < 0) {
+ mutex_unlock(&data->update_lock);
+ return ret;
+ }
+ data->config_fan = ret;
+
+ if (!(data->config_fan & 0x20)) { /* register is read-only */
+ mutex_unlock(&data->update_lock);
+ return -EPERM;
+ }
+
+ if (data->kind == lm96163) {
+ ret = i2c_smbus_read_byte_data(client, LM96163_REG_CONFIG_ENHANCED);
+ if (ret < 0) {
+ mutex_unlock(&data->update_lock);
+ return ret;
+ }
+ data->pwm_highres = !slow_clock && pfr == 8 && (ret & 0x10);
+ }
+
+ if (slow_clock)
+ data->config_fan |= 0x08;
+ else
@@ -93,12 +128,6 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ i2c_smbus_write_byte_data(client, LM63_REG_CONFIG_FAN, data->config_fan);
+ i2c_smbus_write_byte_data(client, LM63_REG_PWM_FREQ, pfr);
+ data->pwm1_freq = pfr;
+
+ if (data->kind == lm96163) {
+ u8 enh = i2c_smbus_read_byte_data(client,
+ LM96163_REG_CONFIG_ENHANCED);
+ data->pwm_highres = !slow_clock && pfr == 8 && (enh & 0x10);
+ }
+ mutex_unlock(&data->update_lock);
+ return count;
+}
@@ -106,10 +135,11 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
/*
* There are 8bit registers for both local(temp1) and remote(temp2) sensor.
* For remote sensor registers temp2_offset has to be considered,
@@ -609,6 +681,42 @@ static ssize_t show_lut_temp_hyst(struct
@@ -629,6 +717,47 @@ static ssize_t show_lut_temp_hyst(struct device *dev,
return sprintf(buf, "%d\n", temp);
}
/*
+/*
+ * The LM63 has a single hysteresis register shared by all LUT entries.
+ * Expose it as a chip-wide hysteresis amount in millidegrees; the
+ * per-point pwm1_auto_pointN_temp_hyst attributes remain read-only and
@@ -120,8 +150,13 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ char *buf)
+{
+ struct lm63_data *data = lm63_update_device(dev);
+ u8 hyst;
+
+ return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->lut_temp_hyst));
+ mutex_lock(&data->update_lock);
+ hyst = data->lut_temp_hyst;
+ mutex_unlock(&data->update_lock);
+
+ return sprintf(buf, "%d\n", TEMP8_FROM_REG(hyst));
+}
+
+static ssize_t pwm1_auto_point_temp_hyst_store(struct device *dev,
@@ -145,11 +180,10 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
+ return count;
+}
+
+/*
/*
* And now the other way around, user-space provides an absolute
* hysteresis value and we have to store a relative one
*/
@@ -743,6 +851,8 @@ static SENSOR_DEVICE_ATTR(fan1_min, S_IW
@@ -764,6 +893,8 @@ static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1, 0);
static DEVICE_ATTR_RW(pwm1_enable);
@@ -158,7 +192,7 @@ Signed-off-by: Jan-Henrik Bruhn <kernel@jhbruhn.de>
static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IWUSR | S_IRUGO,
show_pwm1, set_pwm1, 1);
static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp, S_IWUSR | S_IRUGO,
@@ -848,6 +958,8 @@ static DEVICE_ATTR_RW(update_interval);
@@ -869,6 +1000,8 @@ static DEVICE_ATTR_RW(update_interval);
static struct attribute *lm63_attributes[] = {
&sensor_dev_attr_pwm1.dev_attr.attr,
&dev_attr_pwm1_enable.attr,