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252 lines
7.1 KiB
Diff
252 lines
7.1 KiB
Diff
--- /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/hwmon/Kconfig
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+++ b/drivers/hwmon/Kconfig
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@@ -1537,6 +1537,16 @@ config SENSORS_MC13783_ADC
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help
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Support for the A/D converter on MC13783 and MC13892 PMIC.
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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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@@ -141,6 +141,7 @@ 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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