lantiq: add cpu temperatur sensor driver for xrx200
Signed-off-by: Florian Eckert <Eckert.Florian@googlemail.com>v19.07.3_mercusys_ac12_duma
Florian Eckert
8 years ago
committed by
John Crispin
parent
2feb9433e2
commit
828e25e325
@ -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(<q_cputemp_driver);
|
||||
+ return ret;
|
||||
+}
|
||||
+
|
||||
+void clean_ltq_cputemp(void)
|
||||
+{
|
||||
+ platform_driver_unregister(<q_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");
|
||||
Loading…
Reference in New Issue