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508 lines
15 KiB
508 lines
15 KiB
From de9bdcff7ec73589cb314a1569ce5aba5fe09146 Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Tue, 26 Mar 2013 19:24:24 +0000
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Subject: [PATCH 017/114] Added hwmon/thermal driver for reporting core
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temperature. Thanks Dorian
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---
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arch/arm/mach-bcm2708/bcm2708.c | 11 ++
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drivers/hwmon/Kconfig | 10 ++
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drivers/hwmon/Makefile | 1 +
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drivers/hwmon/bcm2835-hwmon.c | 219 ++++++++++++++++++++++++++++++++++++++
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drivers/thermal/Kconfig | 6 ++
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drivers/thermal/Makefile | 1 +
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drivers/thermal/bcm2835-thermal.c | 184 ++++++++++++++++++++++++++++++++
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7 files changed, 432 insertions(+)
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create mode 100644 drivers/hwmon/bcm2835-hwmon.c
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create mode 100644 drivers/thermal/bcm2835-thermal.c
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--- a/arch/arm/mach-bcm2708/bcm2708.c
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+++ b/arch/arm/mach-bcm2708/bcm2708.c
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@@ -455,6 +455,14 @@ static struct platform_device bcm2708_al
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},
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};
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+static struct platform_device bcm2835_hwmon_device = {
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+ .name = "bcm2835_hwmon",
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+};
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+
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+static struct platform_device bcm2835_thermal_device = {
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+ .name = "bcm2835_thermal",
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+};
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+
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int __init bcm_register_device(struct platform_device *pdev)
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{
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int ret;
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@@ -563,6 +571,9 @@ void __init bcm2708_init(void)
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for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
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bcm_register_device(&bcm2708_alsa_devices[i]);
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+ bcm_register_device(&bcm2835_hwmon_device);
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+ bcm_register_device(&bcm2835_thermal_device);
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+
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for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
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struct amba_device *d = amba_devs[i];
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amba_device_register(d, &iomem_resource);
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--- a/drivers/hwmon/Kconfig
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+++ b/drivers/hwmon/Kconfig
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@@ -1689,6 +1689,16 @@ config SENSORS_ULTRA45
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This driver provides support for the Ultra45 workstation environmental
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sensors.
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+config SENSORS_BCM2835
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+ depends on THERMAL_BCM2835=n
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+ tristate "Broadcom BCM2835 HWMON Driver"
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+ help
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+ If you say yes here you get support for the hardware
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+ monitoring features of the BCM2835 Chip
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called bcm2835-hwmon.
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+
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if ACPI
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comment "ACPI drivers"
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--- a/drivers/hwmon/Makefile
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+++ b/drivers/hwmon/Makefile
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@@ -154,6 +154,7 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l7
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obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
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obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
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obj-$(CONFIG_SENSORS_GSC) += gsc.o
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+obj-$(CONFIG_SENSORS_BCM2835) += bcm2835-hwmon.o
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obj-$(CONFIG_PMBUS) += pmbus/
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--- /dev/null
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+++ b/drivers/hwmon/bcm2835-hwmon.c
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@@ -0,0 +1,219 @@
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+/*****************************************************************************
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+* Copyright 2011 Broadcom Corporation. All rights reserved.
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+*
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+* Unless you and Broadcom execute a separate written software license
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+* agreement governing use of this software, this software is licensed to you
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+* under the terms of the GNU General Public License version 2, available at
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+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
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+*
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+* Notwithstanding the above, under no circumstances may you combine this
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+* software in any way with any other Broadcom software provided under a
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+* license other than the GPL, without Broadcom's express prior written
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+* consent.
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+*****************************************************************************/
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/hwmon.h>
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+#include <linux/hwmon-sysfs.h>
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+#include <linux/platform_device.h>
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+#include <linux/sysfs.h>
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+#include <mach/vcio.h>
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+#include <linux/slab.h>
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+#include <linux/err.h>
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+
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+#define MODULE_NAME "bcm2835_hwmon"
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+
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+/*#define HWMON_DEBUG_ENABLE*/
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+
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+#ifdef HWMON_DEBUG_ENABLE
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+#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
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+#else
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+#define print_debug(fmt,...)
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+#endif
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+#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
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+#define print_info(fmt,...) printk(KERN_INFO "%s: "fmt"\n", MODULE_NAME, ##__VA_ARGS__)
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+
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+#define VC_TAG_GET_TEMP 0x00030006
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+#define VC_TAG_GET_MAX_TEMP 0x0003000A
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+
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+/* --- STRUCTS --- */
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+struct bcm2835_hwmon_data {
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+ struct device *hwmon_dev;
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+};
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+
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+/* tag part of the message */
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+struct vc_msg_tag {
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+ uint32_t tag_id; /* the tag ID for the temperature */
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+ uint32_t buffer_size; /* size of the buffer (should be 8) */
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+ uint32_t request_code; /* identifies message as a request (should be 0) */
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+ uint32_t id; /* extra ID field (should be 0) */
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+ uint32_t val; /* returned value of the temperature */
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+};
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+
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+/* message structure to be sent to videocore */
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+struct vc_msg {
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+ uint32_t msg_size; /* simply, sizeof(struct vc_msg) */
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+ uint32_t request_code; /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
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+ struct vc_msg_tag tag; /* the tag structure above to make */
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+ uint32_t end_tag; /* an end identifier, should be set to NULL */
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+};
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+
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+typedef enum {
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+ TEMP,
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+ MAX_TEMP,
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+} temp_type;
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+
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+/* --- PROTOTYPES --- */
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+static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf);
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+static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf);
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+
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+/* --- GLOBALS --- */
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+
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+static struct bcm2835_hwmon_data *bcm2835_data;
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+static struct platform_driver bcm2835_hwmon_driver;
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+
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+static SENSOR_DEVICE_ATTR(name, S_IRUGO,bcm2835_get_name,NULL,0);
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+static SENSOR_DEVICE_ATTR(temp1_input,S_IRUGO,bcm2835_get_temp,NULL,TEMP);
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+static SENSOR_DEVICE_ATTR(temp1_max,S_IRUGO,bcm2835_get_temp,NULL,MAX_TEMP);
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+
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+static struct attribute* bcm2835_attributes[] = {
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+ &sensor_dev_attr_name.dev_attr.attr,
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+ &sensor_dev_attr_temp1_input.dev_attr.attr,
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+ &sensor_dev_attr_temp1_max.dev_attr.attr,
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+ NULL,
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+};
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+
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+static struct attribute_group bcm2835_attr_group = {
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+ .attrs = bcm2835_attributes,
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+};
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+
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+/* --- FUNCTIONS --- */
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+
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+static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf)
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+{
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+ return sprintf(buf,"bcm2835_hwmon\n");
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+}
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+
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+static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf)
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+{
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+ struct vc_msg msg;
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+ int result;
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+ uint temp = 0;
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+ int index = ((struct sensor_device_attribute*)to_sensor_dev_attr(attr))->index;
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+
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+ print_debug("IN");
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+
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+ /* wipe all previous message data */
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+ memset(&msg, 0, sizeof msg);
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+
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+ /* determine the message type */
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+ if(index == TEMP)
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+ msg.tag.tag_id = VC_TAG_GET_TEMP;
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+ else if (index == MAX_TEMP)
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+ msg.tag.tag_id = VC_TAG_GET_MAX_TEMP;
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+ else
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+ {
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+ print_debug("Unknown temperature message!");
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+ return -EINVAL;
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+ }
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+
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+ msg.msg_size = sizeof msg;
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+ msg.tag.buffer_size = 8;
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+
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+ /* send the message */
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+ result = bcm_mailbox_property(&msg, sizeof msg);
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+
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+ /* check if it was all ok and return the rate in milli degrees C */
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+ if (result == 0 && (msg.request_code & 0x80000000))
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+ temp = (uint)msg.tag.val;
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+ #ifdef HWMON_DEBUG_ENABLE
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+ else
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+ print_debug("Failed to get temperature!");
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+ #endif
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+ print_debug("Got temperature as %u",temp);
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+ print_debug("OUT");
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+ return sprintf(buf, "%u\n", temp);
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+}
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+
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+
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+static int bcm2835_hwmon_probe(struct platform_device *pdev)
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+{
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+ int err;
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+
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+ print_debug("IN");
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+ print_debug("HWMON Driver has been probed!");
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+
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+ /* check that the device isn't null!*/
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+ if(pdev == NULL)
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+ {
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+ print_debug("Platform device is empty!");
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+ return -ENODEV;
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+ }
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+
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+ /* allocate memory for neccessary data */
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+ bcm2835_data = kzalloc(sizeof(struct bcm2835_hwmon_data),GFP_KERNEL);
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+ if(!bcm2835_data)
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+ {
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+ print_debug("Unable to allocate memory for hwmon data!");
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+ err = -ENOMEM;
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+ goto kzalloc_error;
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+ }
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+
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+ /* create the sysfs files */
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+ if(sysfs_create_group(&pdev->dev.kobj, &bcm2835_attr_group))
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+ {
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+ print_debug("Unable to create sysfs files!");
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+ err = -EFAULT;
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+ goto sysfs_error;
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+ }
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+
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+ /* register the hwmon device */
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+ bcm2835_data->hwmon_dev = hwmon_device_register(&pdev->dev);
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+ if (IS_ERR(bcm2835_data->hwmon_dev))
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+ {
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+ err = PTR_ERR(bcm2835_data->hwmon_dev);
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+ goto hwmon_error;
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+ }
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+ print_debug("OUT");
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+ return 0;
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+
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+ /* error goto's */
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+ hwmon_error:
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+ sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
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+
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+ sysfs_error:
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+ kfree(bcm2835_data);
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+
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+ kzalloc_error:
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+
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+ return err;
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+
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+}
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+
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+static int bcm2835_hwmon_remove(struct platform_device *pdev)
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+{
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+ print_debug("IN");
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+ hwmon_device_unregister(bcm2835_data->hwmon_dev);
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+
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+ sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
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+ print_debug("OUT");
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+ return 0;
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+}
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+
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+/* Hwmon Driver */
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+static struct platform_driver bcm2835_hwmon_driver = {
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+ .probe = bcm2835_hwmon_probe,
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+ .remove = bcm2835_hwmon_remove,
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+ .driver = {
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+ .name = "bcm2835_hwmon",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Dorian Peake");
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+MODULE_DESCRIPTION("HW Monitor driver for bcm2835 chip");
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+
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+module_platform_driver(bcm2835_hwmon_driver);
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--- a/drivers/thermal/Kconfig
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+++ b/drivers/thermal/Kconfig
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@@ -206,6 +206,12 @@ config INTEL_POWERCLAMP
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enforce idle time which results in more package C-state residency. The
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user interface is exposed via generic thermal framework.
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+config THERMAL_BCM2835
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+ tristate "BCM2835 Thermal Driver"
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+ help
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+ This will enable temperature monitoring for the Broadcom BCM2835
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+ chip. If built as a module, it will be called 'bcm2835-thermal'.
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+
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config X86_PKG_TEMP_THERMAL
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tristate "X86 package temperature thermal driver"
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depends on X86_THERMAL_VECTOR
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--- a/drivers/thermal/Makefile
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+++ b/drivers/thermal/Makefile
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@@ -29,6 +29,7 @@ obj-$(CONFIG_ARMADA_THERMAL) += armada_t
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obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
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obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
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obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
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+obj-$(CONFIG_THERMAL_BCM2835) += bcm2835-thermal.o
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obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o
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obj-$(CONFIG_INTEL_SOC_DTS_THERMAL) += intel_soc_dts_thermal.o
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obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/
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--- /dev/null
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+++ b/drivers/thermal/bcm2835-thermal.c
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@@ -0,0 +1,184 @@
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+/*****************************************************************************
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+* Copyright 2011 Broadcom Corporation. All rights reserved.
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+*
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+* Unless you and Broadcom execute a separate written software license
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+* agreement governing use of this software, this software is licensed to you
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+* under the terms of the GNU General Public License version 2, available at
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+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
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+*
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+* Notwithstanding the above, under no circumstances may you combine this
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+* software in any way with any other Broadcom software provided under a
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+* license other than the GPL, without Broadcom's express prior written
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+* consent.
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+*****************************************************************************/
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+#include <linux/sysfs.h>
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+#include <mach/vcio.h>
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+#include <linux/thermal.h>
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+
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+
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+/* --- DEFINITIONS --- */
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+#define MODULE_NAME "bcm2835_thermal"
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+
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+/*#define THERMAL_DEBUG_ENABLE*/
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+
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+#ifdef THERMAL_DEBUG_ENABLE
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+#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
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+#else
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+#define print_debug(fmt,...)
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+#endif
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+#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
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+
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+#define VC_TAG_GET_TEMP 0x00030006
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+#define VC_TAG_GET_MAX_TEMP 0x0003000A
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+
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+typedef enum {
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+ TEMP,
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+ MAX_TEMP,
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+} temp_type;
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+
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+/* --- STRUCTS --- */
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+/* tag part of the message */
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+struct vc_msg_tag {
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+ uint32_t tag_id; /* the tag ID for the temperature */
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+ uint32_t buffer_size; /* size of the buffer (should be 8) */
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+ uint32_t request_code; /* identifies message as a request (should be 0) */
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+ uint32_t id; /* extra ID field (should be 0) */
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+ uint32_t val; /* returned value of the temperature */
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+};
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+
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+/* message structure to be sent to videocore */
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+struct vc_msg {
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+ uint32_t msg_size; /* simply, sizeof(struct vc_msg) */
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+ uint32_t request_code; /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
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+ struct vc_msg_tag tag; /* the tag structure above to make */
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+ uint32_t end_tag; /* an end identifier, should be set to NULL */
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+};
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+
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+struct bcm2835_thermal_data {
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+ struct thermal_zone_device *thermal_dev;
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+ struct vc_msg msg;
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+};
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+
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+/* --- GLOBALS --- */
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+static struct bcm2835_thermal_data bcm2835_data;
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+
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+/* Thermal Device Operations */
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+static struct thermal_zone_device_ops ops;
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+
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+/* --- FUNCTIONS --- */
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+
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+static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
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+{
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+ int result = -1, retry = 3;
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+ print_debug("IN");
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+
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+ *temp = 0;
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+ while (result != 0 && retry-- > 0) {
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+ /* wipe all previous message data */
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+ memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
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+
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+ /* prepare message */
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+ bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
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+ bcm2835_data.msg.tag.buffer_size = 8;
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+ bcm2835_data.msg.tag.tag_id = tag_id;
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+
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+ /* send the message */
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+ result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
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+ print_debug("Got %stemperature as %u (%d,%x)\n", tag_id==VC_TAG_GET_MAX_TEMP ? "max ":"", (uint)bcm2835_data.msg.tag.val, result, bcm2835_data.msg.request_code);
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+ if (!(bcm2835_data.msg.request_code & 0x80000000))
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+ result = -1;
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+ }
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+
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+ /* check if it was all ok and return the rate in milli degrees C */
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+ if (result == 0)
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+ *temp = (uint)bcm2835_data.msg.tag.val;
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+ else
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+ print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
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+ print_debug("OUT");
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+ return result;
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+}
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+
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+static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
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+{
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+ return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
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+}
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+
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+static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
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+{
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+ return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
|
|
+}
|
|
+
|
|
+static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
|
|
+{
|
|
+ *trip_type = THERMAL_TRIP_HOT;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
|
|
+{
|
|
+ *dev_mode = THERMAL_DEVICE_ENABLED;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static int bcm2835_thermal_probe(struct platform_device *pdev)
|
|
+{
|
|
+ print_debug("IN");
|
|
+ print_debug("THERMAL Driver has been probed!");
|
|
+
|
|
+ /* check that the device isn't null!*/
|
|
+ if(pdev == NULL)
|
|
+ {
|
|
+ print_debug("Platform device is empty!");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal", 1, 0, NULL, &ops, NULL, 0, 0)))
|
|
+ {
|
|
+ print_debug("Unable to register the thermal device!");
|
|
+ return -EFAULT;
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static int bcm2835_thermal_remove(struct platform_device *pdev)
|
|
+{
|
|
+ print_debug("IN");
|
|
+
|
|
+ thermal_zone_device_unregister(bcm2835_data.thermal_dev);
|
|
+
|
|
+ print_debug("OUT");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct thermal_zone_device_ops ops = {
|
|
+ .get_temp = bcm2835_get_temp,
|
|
+ .get_trip_temp = bcm2835_get_max_temp,
|
|
+ .get_trip_type = bcm2835_get_trip_type,
|
|
+ .get_mode = bcm2835_get_mode,
|
|
+};
|
|
+
|
|
+/* Thermal Driver */
|
|
+static struct platform_driver bcm2835_thermal_driver = {
|
|
+ .probe = bcm2835_thermal_probe,
|
|
+ .remove = bcm2835_thermal_remove,
|
|
+ .driver = {
|
|
+ .name = "bcm2835_thermal",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Dorian Peake");
|
|
+MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
|
|
+
|
|
+module_platform_driver(bcm2835_thermal_driver);
|
|
|