168 lines
4.3 KiB
Diff
168 lines
4.3 KiB
Diff
--- a/drivers/hwmon/Makefile
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+++ b/drivers/hwmon/Makefile
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@@ -107,6 +107,7 @@ obj-$(CONFIG_SENSORS_LTC4222) += ltc4222
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obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
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obj-$(CONFIG_SENSORS_LTC4260) += ltc4260.o
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obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
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+obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o
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obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
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obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
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obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
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--- a/drivers/hwmon/Kconfig
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+++ b/drivers/hwmon/Kconfig
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@@ -762,6 +762,14 @@ config SENSORS_LTC4261
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This driver can also be built as a module. If so, the module will
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be called ltc4261.
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+config SENSORS_LTQ_CPUTEMP
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+ bool "Lantiq CPU temperature sensor"
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+ depends on LANTIQ
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+ default n
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+ help
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+ If you say yes here you get support for the temperature
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+ sensor inside your CPU.
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+
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config SENSORS_MAX1111
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tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
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depends on SPI_MASTER
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--- /dev/null
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+++ b/drivers/hwmon/ltq-cputemp.c
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@@ -0,0 +1,138 @@
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+/* Lantiq CPU Temperatur sensor driver for xrx200
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+ *
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+ * Copyright (C) 2016 Florian Eckert <feckert@tdt.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version
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+ *
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+ * This program is distributed in the hope that it will be useful
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, see <http://www.gnu.org/licenses/>
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/of_device.h>
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+#include <linux/hwmon.h>
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+#include <linux/hwmon-sysfs.h>
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+
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+#include <lantiq_soc.h>
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+
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+/* gphy1 configuration register contains cpu temperature */
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+#define CGU_GPHY1_CR 0x0040
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+#define CGU_TEMP_PD BIT(19)
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+
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+static void ltq_cputemp_enable(void)
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+{
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+ ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) | CGU_TEMP_PD, CGU_GPHY1_CR);
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+}
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+
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+static void ltq_cputemp_disable(void)
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+{
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+ ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) & ~CGU_TEMP_PD, CGU_GPHY1_CR);
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+}
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+
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+static int ltq_cputemp_read(void)
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+{
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+ /* Shift 9 for register alignment and 1 to divide value by 2 */
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+ return (ltq_cgu_r32(CGU_GPHY1_CR) >> 10) & 0xFF;
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+}
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+
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+static ssize_t show_cputemp(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ int value;
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+
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+ value = ltq_cputemp_read();
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+ /* scale temp to millidegree */
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+ value = value * 1000;
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+
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+ return sprintf(buf, "%d\n", value);
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+}
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+
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+static DEVICE_ATTR(temp1_input, S_IRUGO, show_cputemp, NULL);
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+
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+static struct attribute *ltq_cputemp_attrs[] = {
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+ &dev_attr_temp1_input.attr,
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+ NULL
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+};
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+
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+ATTRIBUTE_GROUPS(ltq_cputemp);
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+
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+static int ltq_cputemp_probe(struct platform_device *pdev)
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+{
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+ int value = 0;
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+ int ret;
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+ struct device *hwmon_dev;
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+
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+ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
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+ "CPU0",
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+ NULL,
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+ ltq_cputemp_groups);
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+
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+ if (IS_ERR(hwmon_dev)) {
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+ dev_err(&pdev->dev, "Failed to register as hwmon device");
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+ ret = PTR_ERR(hwmon_dev);
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+ goto error_hwmon;
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+ }
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+
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+ ltq_cputemp_enable();
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+ value = ltq_cputemp_read();
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+ dev_info(&pdev->dev, "Current CPU die temperature: %d °C", value);
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+
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+ return 0;
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+
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+error_hwmon:
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+ return ret;
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+}
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+
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+static int ltq_cputemp_release(struct platform_device *pdev)
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+{
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+ hwmon_device_unregister(&pdev->dev);
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+ ltq_cputemp_disable();
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+ return 0;
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+}
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+
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+const struct of_device_id ltq_cputemp_match[] = {
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+ { .compatible = "lantiq,cputemp" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, ltq_cputemp_match);
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+
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+static struct platform_driver ltq_cputemp_driver = {
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+ .probe = ltq_cputemp_probe,
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+ .remove = ltq_cputemp_release,
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+ .driver = {
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+ .name = "ltq-cputemp",
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+ .owner = THIS_MODULE,
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+ .of_match_table = ltq_cputemp_match,
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+ },
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+};
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+
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+int __init init_ltq_cputemp(void)
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+{
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+ int ret;
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+
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+ ret = platform_driver_register(<q_cputemp_driver);
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+ return ret;
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+}
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+
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+void clean_ltq_cputemp(void)
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+{
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+ platform_driver_unregister(<q_cputemp_driver);
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+ return;
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+}
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+
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+module_init(init_ltq_cputemp);
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+module_exit(clean_ltq_cputemp);
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+
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+MODULE_AUTHOR("Florian Eckert <feckert@tdt.de>");
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+
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+MODULE_DESCRIPTION("Lantiq Temperature Sensor");
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+MODULE_LICENSE("GPL");
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