lantiq: add cpu temperatur sensor driver for xrx200

Signed-off-by: Florian Eckert <Eckert.Florian@googlemail.com>

diff --git a/target/linux/lantiq/config-4.4 b/target/linux/lantiq/config-4.4
index cf3ec4742933cf16fbb614a306bcbc15c6f891cc..073b7c7cf78b002efd72bcf76144fa0c1d45a41e 100644 (file)
--- 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 (file)
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 bae4f629e231f7f33ca0a946d554a4dcc202dbdb..955461c8831bab78922354df998b18f81f96f53c 100644 (file)
--- 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