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210 lines
6.4 KiB
Diff
210 lines
6.4 KiB
Diff
--- /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);
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+}
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+
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+static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
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+{
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+ *trip_type = THERMAL_TRIP_HOT;
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+ return 0;
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+}
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+
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+
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+static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
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+{
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+ *dev_mode = THERMAL_DEVICE_ENABLED;
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+ return 0;
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+}
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+
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+
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+static int bcm2835_thermal_probe(struct platform_device *pdev)
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+{
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+ print_debug("IN");
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+ print_debug("THERMAL 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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+ if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal", 1, 0, NULL, &ops, NULL, 0, 0)))
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+ {
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+ print_debug("Unable to register the thermal device!");
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+ return -EFAULT;
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+ }
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+ return 0;
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+}
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+
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+
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+static int bcm2835_thermal_remove(struct platform_device *pdev)
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+{
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+ print_debug("IN");
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+
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+ thermal_zone_device_unregister(bcm2835_data.thermal_dev);
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+
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+ print_debug("OUT");
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+
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+ return 0;
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+}
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+
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+static struct thermal_zone_device_ops ops = {
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+ .get_temp = bcm2835_get_temp,
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+ .get_trip_temp = bcm2835_get_max_temp,
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+ .get_trip_type = bcm2835_get_trip_type,
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+ .get_mode = bcm2835_get_mode,
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+};
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+
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+/* Thermal Driver */
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+static struct platform_driver bcm2835_thermal_driver = {
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+ .probe = bcm2835_thermal_probe,
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+ .remove = bcm2835_thermal_remove,
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+ .driver = {
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+ .name = "bcm2835_thermal",
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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("Thermal driver for bcm2835 chip");
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+
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+module_platform_driver(bcm2835_thermal_driver);
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--- a/drivers/thermal/Kconfig
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+++ b/drivers/thermal/Kconfig
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@@ -169,4 +169,11 @@ 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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endif
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+
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--- a/drivers/thermal/Makefile
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+++ b/drivers/thermal/Makefile
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@@ -23,4 +23,5 @@ obj-$(CONFIG_DB8500_THERMAL) += db8500_t
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obj-$(CONFIG_ARMADA_THERMAL) += armada_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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