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authorFlorian Eckert <Eckert.Florian@googlemail.com>2016-08-01 11:10:42 +0200
committerJohn Crispin <john@phrozen.org>2016-08-03 15:30:13 +0200
commit828e25e32569704cbfe9e98c9fa7c533ffbbcb65 (patch)
treebccba6a4886e190a5714f18cb19bf1c5593c413d
parent2feb9433e237e8e38c9a52c232e6a1c7deb95333 (diff)
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lantiq: add cpu temperatur sensor driver for xrx200
Signed-off-by: Florian Eckert <Eckert.Florian@googlemail.com>
-rw-r--r--target/linux/lantiq/config-4.41
-rw-r--r--target/linux/lantiq/patches-4.4/0302-xrx200-add-sensors-driver.patch168
-rw-r--r--target/linux/lantiq/xrx200/config-default2
3 files changed, 171 insertions, 0 deletions
diff --git a/target/linux/lantiq/config-4.4 b/target/linux/lantiq/config-4.4
index cf3ec47..073b7c7 100644
--- a/target/linux/lantiq/config-4.4
+++ b/target/linux/lantiq/config-4.4
@@ -178,6 +178,7 @@ CONFIG_RTL8366_SMI=y
CONFIG_SCHED_HRTICK=y
# CONFIG_SCHED_INFO is not set
# CONFIG_SCSI_DMA is not set
+# CONFIG_SENSORS_LTQ_CPUTEMP is not set
# CONFIG_SERIAL_8250 is not set
CONFIG_SERIAL_LANTIQ=y
# CONFIG_SOC_AMAZON_SE is not set
diff --git a/target/linux/lantiq/patches-4.4/0302-xrx200-add-sensors-driver.patch b/target/linux/lantiq/patches-4.4/0302-xrx200-add-sensors-driver.patch
new file mode 100644
index 0000000..628e476
--- /dev/null
+++ b/target/linux/lantiq/patches-4.4/0302-xrx200-add-sensors-driver.patch
@@ -0,0 +1,168 @@
+--- a/drivers/hwmon/Makefile
++++ b/drivers/hwmon/Makefile
+@@ -107,6 +107,7 @@ obj-$(CONFIG_SENSORS_LTC4222) += ltc4222
+ obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
+ obj-$(CONFIG_SENSORS_LTC4260) += ltc4260.o
+ obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
++obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o
+ obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
+ obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
+ obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
+--- a/drivers/hwmon/Kconfig
++++ b/drivers/hwmon/Kconfig
+@@ -762,6 +762,14 @@ config SENSORS_LTC4261
+ This driver can also be built as a module. If so, the module will
+ be called ltc4261.
+
++config SENSORS_LTQ_CPUTEMP
++ bool "Lantiq CPU temperature sensor"
++ depends on LANTIQ
++ default n
++ help
++ If you say yes here you get support for the temperature
++ sensor inside your CPU.
++
+ config SENSORS_MAX1111
+ tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
+ depends on SPI_MASTER
+--- /dev/null
++++ b/drivers/hwmon/ltq-cputemp.c
+@@ -0,0 +1,138 @@
++/* Lantiq CPU Temperatur sensor driver for xrx200
++ *
++ * Copyright (C) 2016 Florian Eckert <feckert@tdt.de>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version
++ *
++ * This program is distributed in the hope that it will be useful
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, see <http://www.gnu.org/licenses/>
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/of_device.h>
++#include <linux/hwmon.h>
++#include <linux/hwmon-sysfs.h>
++
++#include <lantiq_soc.h>
++
++/* gphy1 configuration register contains cpu temperature */
++#define CGU_GPHY1_CR 0x0040
++#define CGU_TEMP_PD BIT(19)
++
++static void ltq_cputemp_enable(void)
++{
++ ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) | CGU_TEMP_PD, CGU_GPHY1_CR);
++}
++
++static void ltq_cputemp_disable(void)
++{
++ ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) & ~CGU_TEMP_PD, CGU_GPHY1_CR);
++}
++
++static int ltq_cputemp_read(void)
++{
++ /* Shift 9 for register alignment and 1 to divide value by 2 */
++ return (ltq_cgu_r32(CGU_GPHY1_CR) >> 10) & 0xFF;
++}
++
++static ssize_t show_cputemp(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ int value;
++
++ value = ltq_cputemp_read();
++ /* scale temp to millidegree */
++ value = value * 1000;
++
++ return sprintf(buf, "%d\n", value);
++}
++
++static DEVICE_ATTR(temp1_input, S_IRUGO, show_cputemp, NULL);
++
++static struct attribute *ltq_cputemp_attrs[] = {
++ &dev_attr_temp1_input.attr,
++ NULL
++};
++
++ATTRIBUTE_GROUPS(ltq_cputemp);
++
++static int ltq_cputemp_probe(struct platform_device *pdev)
++{
++ int value = 0;
++ int ret;
++ struct device *hwmon_dev;
++
++ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
++ "CPU0",
++ NULL,
++ ltq_cputemp_groups);
++
++ if (IS_ERR(hwmon_dev)) {
++ dev_err(&pdev->dev, "Failed to register as hwmon device");
++ ret = PTR_ERR(hwmon_dev);
++ goto error_hwmon;
++ }
++
++ ltq_cputemp_enable();
++ value = ltq_cputemp_read();
++ dev_info(&pdev->dev, "Current CPU die temperature: %d °C", value);
++
++ return 0;
++
++error_hwmon:
++ return ret;
++}
++
++static int ltq_cputemp_release(struct platform_device *pdev)
++{
++ hwmon_device_unregister(&pdev->dev);
++ ltq_cputemp_disable();
++ return 0;
++}
++
++const struct of_device_id ltq_cputemp_match[] = {
++ { .compatible = "lantiq,cputemp" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, ltq_cputemp_match);
++
++static struct platform_driver ltq_cputemp_driver = {
++ .probe = ltq_cputemp_probe,
++ .remove = ltq_cputemp_release,
++ .driver = {
++ .name = "ltq-cputemp",
++ .owner = THIS_MODULE,
++ .of_match_table = ltq_cputemp_match,
++ },
++};
++
++int __init init_ltq_cputemp(void)
++{
++ int ret;
++
++ ret = platform_driver_register(&ltq_cputemp_driver);
++ return ret;
++}
++
++void clean_ltq_cputemp(void)
++{
++ platform_driver_unregister(&ltq_cputemp_driver);
++ return;
++}
++
++module_init(init_ltq_cputemp);
++module_exit(clean_ltq_cputemp);
++
++MODULE_AUTHOR("Florian Eckert <feckert@tdt.de>");
++
++MODULE_DESCRIPTION("Lantiq Temperature Sensor");
++MODULE_LICENSE("GPL");
diff --git a/target/linux/lantiq/xrx200/config-default b/target/linux/lantiq/xrx200/config-default
index bae4f62..955461c 100644
--- a/target/linux/lantiq/xrx200/config-default
+++ b/target/linux/lantiq/xrx200/config-default
@@ -5,6 +5,7 @@ CONFIG_CRC16=y
CONFIG_CRYPTO_DEFLATE=y
CONFIG_CRYPTO_LZO=y
CONFIG_FIRMWARE_IN_KERNEL=y
+CONFIG_HWMON=y
CONFIG_ICPLUS_PHY=y
CONFIG_INPUT=y
CONFIG_INPUT_EVDEV=y
@@ -35,6 +36,7 @@ CONFIG_RTL8306_PHY=y
CONFIG_RTL8366S_PHY=y
CONFIG_RTL8367B_PHY=y
CONFIG_RTL8367_PHY=y
+CONFIG_SENSORS_LTQ_CPUTEMP=y
CONFIG_SWCONFIG_LEDS=y
CONFIG_UBIFS_FS=y
CONFIG_UBIFS_FS_ADVANCED_COMPR=y