target/linux/brcm2708/patches-3.10/010-bcm2835-thermal-driver.patch

   1 --- /dev/null
   2 +++ b/drivers/thermal/bcm2835-thermal.c
   3 @@ -0,0 +1,184 @@
   4 +/*****************************************************************************
   5 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
   6 +*
   7 +* Unless you and Broadcom execute a separate written software license
   8 +* agreement governing use of this software, this software is licensed to you
   9 +* under the terms of the GNU General Public License version 2, available at
  10 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  11 +*
  12 +* Notwithstanding the above, under no circumstances may you combine this
  13 +* software in any way with any other Broadcom software provided under a
  14 +* license other than the GPL, without Broadcom's express prior written
  15 +* consent.
  16 +*****************************************************************************/
  17 +
  18 +#include <linux/kernel.h>
  19 +#include <linux/module.h>
  20 +#include <linux/init.h>
  21 +#include <linux/platform_device.h>
  22 +#include <linux/slab.h>
  23 +#include <linux/sysfs.h>
  24 +#include <mach/vcio.h>
  25 +#include <linux/thermal.h>
  26 +
  27 +
  28 +/* --- DEFINITIONS --- */
  29 +#define MODULE_NAME "bcm2835_thermal"
  30 +
  31 +/*#define THERMAL_DEBUG_ENABLE*/
  32 +
  33 +#ifdef THERMAL_DEBUG_ENABLE
  34 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
  35 +#else
  36 +#define print_debug(fmt,...)
  37 +#endif
  38 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
  39 +
  40 +#define VC_TAG_GET_TEMP 0x00030006
  41 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
  42 +
  43 +typedef enum {
  44 +       TEMP,
  45 +       MAX_TEMP,
  46 +} temp_type;
  47 +
  48 +/* --- STRUCTS --- */
  49 +/* tag part of the message */
  50 +struct vc_msg_tag {
  51 +       uint32_t tag_id;                /* the tag ID for the temperature */
  52 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
  53 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
  54 +       uint32_t id;                    /* extra ID field (should be 0) */
  55 +       uint32_t val;                   /* returned value of the temperature */
  56 +};
  57 +
  58 +/* message structure to be sent to videocore */
  59 +struct vc_msg {
  60 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
  61 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
  62 +       struct vc_msg_tag tag;          /* the tag structure above to make */
  63 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
  64 +};
  65 +
  66 +struct bcm2835_thermal_data {
  67 +       struct thermal_zone_device *thermal_dev;
  68 +       struct vc_msg msg;
  69 +};
  70 +
  71 +/* --- GLOBALS --- */
  72 +static struct bcm2835_thermal_data bcm2835_data;
  73 +
  74 +/* Thermal Device Operations */
  75 +static struct thermal_zone_device_ops ops;
  76 +
  77 +/* --- FUNCTIONS --- */
  78 +
  79 +static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
  80 +{
  81 +       int result = -1, retry = 3;
  82 +       print_debug("IN");
  83 +
  84 +       *temp = 0;
  85 +       while (result != 0 && retry-- > 0) {
  86 +               /* wipe all previous message data */
  87 +               memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
  88 +
  89 +               /* prepare message */
  90 +               bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
  91 +               bcm2835_data.msg.tag.buffer_size = 8;
  92 +               bcm2835_data.msg.tag.tag_id = tag_id;
  93 +
  94 +               /* send the message */
  95 +               result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
  96 +               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);
  97 +               if (!(bcm2835_data.msg.request_code & 0x80000000))
  98 +                       result = -1;
  99 +       }
 100 +
 101 +       /* check if it was all ok and return the rate in milli degrees C */
 102 +       if (result == 0)
 103 +               *temp = (uint)bcm2835_data.msg.tag.val;
 104 +       else
 105 +               print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
 106 +       print_debug("OUT");
 107 +       return result;
 108 +}
 109 +
 110 +static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
 111 +{
 112 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
 113 +}
 114 +
 115 +static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
 116 +{
 117 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
 118 +}
 119 +
 120 +static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
 121 +{
 122 +       *trip_type = THERMAL_TRIP_HOT;
 123 +       return 0;
 124 +}
 125 +
 126 +
 127 +static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
 128 +{
 129 +       *dev_mode = THERMAL_DEVICE_ENABLED;
 130 +       return 0;
 131 +}
 132 +
 133 +
 134 +static int bcm2835_thermal_probe(struct platform_device *pdev)
 135 +{
 136 +       print_debug("IN");
 137 +       print_debug("THERMAL Driver has been probed!");
 138 +
 139 +       /* check that the device isn't null!*/
 140 +       if(pdev == NULL)
 141 +       {
 142 +               print_debug("Platform device is empty!");
 143 +               return -ENODEV;
 144 +       }
 145 +
 146 +       if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal",  1, 0, NULL, &ops, NULL, 0, 0)))
 147 +       {
 148 +               print_debug("Unable to register the thermal device!");
 149 +               return -EFAULT;
 150 +       }
 151 +       return 0;
 152 +}
 153 +
 154 +
 155 +static int bcm2835_thermal_remove(struct platform_device *pdev)
 156 +{
 157 +       print_debug("IN");
 158 +
 159 +       thermal_zone_device_unregister(bcm2835_data.thermal_dev);
 160 +
 161 +       print_debug("OUT");
 162 +
 163 +       return 0;
 164 +}
 165 +
 166 +static struct thermal_zone_device_ops ops  = {
 167 +       .get_temp = bcm2835_get_temp,
 168 +       .get_trip_temp = bcm2835_get_max_temp,
 169 +       .get_trip_type = bcm2835_get_trip_type,
 170 +       .get_mode = bcm2835_get_mode,
 171 +};
 172 +
 173 +/* Thermal Driver */
 174 +static struct platform_driver bcm2835_thermal_driver = {
 175 +       .probe = bcm2835_thermal_probe,
 176 +       .remove = bcm2835_thermal_remove,
 177 +       .driver = {
 178 +                               .name = "bcm2835_thermal",
 179 +                               .owner = THIS_MODULE,
 180 +                       },
 181 +};
 182 +
 183 +MODULE_LICENSE("GPL");
 184 +MODULE_AUTHOR("Dorian Peake");
 185 +MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
 186 +
 187 +module_platform_driver(bcm2835_thermal_driver);
 188 --- a/drivers/thermal/Kconfig
 189 +++ b/drivers/thermal/Kconfig
 190 @@ -169,4 +169,11 @@ config INTEL_POWERCLAMP
 191           enforce idle time which results in more package C-state residency. The
 192           user interface is exposed via generic thermal framework.
 193
 194 +config THERMAL_BCM2835
 195 +       tristate "BCM2835 Thermal Driver"
 196 +       help
 197 +         This will enable temperature monitoring for the Broadcom BCM2835
 198 +         chip. If built as a module, it will be called 'bcm2835-thermal'.
 199 +
 200  endif
 201 +
 202 --- a/drivers/thermal/Makefile
 203 +++ b/drivers/thermal/Makefile
 204 @@ -23,4 +23,5 @@ obj-$(CONFIG_DB8500_THERMAL)  += db8500_t
 205  obj-$(CONFIG_ARMADA_THERMAL)   += armada_thermal.o
 206  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
 207  obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
 208 +obj-$(CONFIG_THERMAL_BCM2835)  += bcm2835-thermal.o
 209