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

   1 diff -urN linux-3.10/drivers/thermal/bcm2835-thermal.c linux-rpi-3.10.y/drivers/thermal/bcm2835-thermal.c
   2 --- linux-3.10/drivers/thermal/bcm2835-thermal.c        1970-01-01 01:00:00.000000000 +0100
   3 +++ linux-rpi-3.10.y/drivers/thermal/bcm2835-thermal.c  2013-07-06 15:25:50.000000000 +0100
   4 @@ -0,0 +1,184 @@
   5 +/*****************************************************************************
   6 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
   7 +*
   8 +* Unless you and Broadcom execute a separate written software license
   9 +* agreement governing use of this software, this software is licensed to you
  10 +* under the terms of the GNU General Public License version 2, available at
  11 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  12 +*
  13 +* Notwithstanding the above, under no circumstances may you combine this
  14 +* software in any way with any other Broadcom software provided under a
  15 +* license other than the GPL, without Broadcom's express prior written
  16 +* consent.
  17 +*****************************************************************************/
  18 +
  19 +#include <linux/kernel.h>
  20 +#include <linux/module.h>
  21 +#include <linux/init.h>
  22 +#include <linux/platform_device.h>
  23 +#include <linux/slab.h>
  24 +#include <linux/sysfs.h>
  25 +#include <mach/vcio.h>
  26 +#include <linux/thermal.h>
  27 +
  28 +
  29 +/* --- DEFINITIONS --- */
  30 +#define MODULE_NAME "bcm2835_thermal"
  31 +
  32 +/*#define THERMAL_DEBUG_ENABLE*/
  33 +
  34 +#ifdef THERMAL_DEBUG_ENABLE
  35 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
  36 +#else
  37 +#define print_debug(fmt,...)
  38 +#endif
  39 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
  40 +
  41 +#define VC_TAG_GET_TEMP 0x00030006
  42 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
  43 +
  44 +typedef enum {
  45 +       TEMP,
  46 +       MAX_TEMP,
  47 +} temp_type;
  48 +
  49 +/* --- STRUCTS --- */
  50 +/* tag part of the message */
  51 +struct vc_msg_tag {
  52 +       uint32_t tag_id;                /* the tag ID for the temperature */
  53 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
  54 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
  55 +       uint32_t id;                    /* extra ID field (should be 0) */
  56 +       uint32_t val;                   /* returned value of the temperature */
  57 +};
  58 +
  59 +/* message structure to be sent to videocore */
  60 +struct vc_msg {
  61 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
  62 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
  63 +       struct vc_msg_tag tag;          /* the tag structure above to make */
  64 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
  65 +};
  66 +
  67 +struct bcm2835_thermal_data {
  68 +       struct thermal_zone_device *thermal_dev;
  69 +       struct vc_msg msg;
  70 +};
  71 +
  72 +/* --- GLOBALS --- */
  73 +static struct bcm2835_thermal_data bcm2835_data;
  74 +
  75 +/* Thermal Device Operations */
  76 +static struct thermal_zone_device_ops ops;
  77 +
  78 +/* --- FUNCTIONS --- */
  79 +
  80 +static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
  81 +{
  82 +       int result = -1, retry = 3;
  83 +       print_debug("IN");
  84 +
  85 +       *temp = 0;
  86 +       while (result != 0 && retry-- > 0) {
  87 +               /* wipe all previous message data */
  88 +               memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
  89 +
  90 +               /* prepare message */
  91 +               bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
  92 +               bcm2835_data.msg.tag.buffer_size = 8;
  93 +               bcm2835_data.msg.tag.tag_id = tag_id;
  94 +
  95 +               /* send the message */
  96 +               result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
  97 +               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);
  98 +               if (!(bcm2835_data.msg.request_code & 0x80000000))
  99 +                       result = -1;
 100 +       }
 101 +
 102 +       /* check if it was all ok and return the rate in milli degrees C */
 103 +       if (result == 0)
 104 +               *temp = (uint)bcm2835_data.msg.tag.val;
 105 +       else
 106 +               print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
 107 +       print_debug("OUT");
 108 +       return result;
 109 +}
 110 +
 111 +static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
 112 +{
 113 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
 114 +}
 115 +
 116 +static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
 117 +{
 118 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
 119 +}
 120 +
 121 +static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
 122 +{
 123 +       *trip_type = THERMAL_TRIP_HOT;
 124 +       return 0;
 125 +}
 126 +
 127 +
 128 +static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
 129 +{
 130 +       *dev_mode = THERMAL_DEVICE_ENABLED;
 131 +       return 0;
 132 +}
 133 +
 134 +
 135 +static int bcm2835_thermal_probe(struct platform_device *pdev)
 136 +{
 137 +       print_debug("IN");
 138 +       print_debug("THERMAL Driver has been probed!");
 139 +
 140 +       /* check that the device isn't null!*/
 141 +       if(pdev == NULL)
 142 +       {
 143 +               print_debug("Platform device is empty!");
 144 +               return -ENODEV;
 145 +       }
 146 +
 147 +       if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal",  1, 0, NULL, &ops, NULL, 0, 0)))
 148 +       {
 149 +               print_debug("Unable to register the thermal device!");
 150 +               return -EFAULT;
 151 +       }
 152 +       return 0;
 153 +}
 154 +
 155 +
 156 +static int bcm2835_thermal_remove(struct platform_device *pdev)
 157 +{
 158 +       print_debug("IN");
 159 +
 160 +       thermal_zone_device_unregister(bcm2835_data.thermal_dev);
 161 +
 162 +       print_debug("OUT");
 163 +
 164 +       return 0;
 165 +}
 166 +
 167 +static struct thermal_zone_device_ops ops  = {
 168 +       .get_temp = bcm2835_get_temp,
 169 +       .get_trip_temp = bcm2835_get_max_temp,
 170 +       .get_trip_type = bcm2835_get_trip_type,
 171 +       .get_mode = bcm2835_get_mode,
 172 +};
 173 +
 174 +/* Thermal Driver */
 175 +static struct platform_driver bcm2835_thermal_driver = {
 176 +       .probe = bcm2835_thermal_probe,
 177 +       .remove = bcm2835_thermal_remove,
 178 +       .driver = {
 179 +                               .name = "bcm2835_thermal",
 180 +                               .owner = THIS_MODULE,
 181 +                       },
 182 +};
 183 +
 184 +MODULE_LICENSE("GPL");
 185 +MODULE_AUTHOR("Dorian Peake");
 186 +MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
 187 +
 188 +module_platform_driver(bcm2835_thermal_driver);
 189 diff -urN linux-3.10/drivers/thermal/Kconfig linux-rpi-3.10.y/drivers/thermal/Kconfig
 190 --- linux-3.10/drivers/thermal/Kconfig  2013-06-30 23:13:29.000000000 +0100
 191 +++ linux-rpi-3.10.y/drivers/thermal/Kconfig    2013-07-06 15:25:50.000000000 +0100
 192 @@ -169,4 +169,11 @@
 193           enforce idle time which results in more package C-state residency. The
 194           user interface is exposed via generic thermal framework.
 195
 196 +config THERMAL_BCM2835
 197 +       tristate "BCM2835 Thermal Driver"
 198 +       help
 199 +         This will enable temperature monitoring for the Broadcom BCM2835
 200 +         chip. If built as a module, it will be called 'bcm2835-thermal'.
 201 +
 202  endif
 203 +
 204 diff -urN linux-3.10/drivers/thermal/Makefile linux-rpi-3.10.y/drivers/thermal/Makefile
 205 --- linux-3.10/drivers/thermal/Makefile 2013-06-30 23:13:29.000000000 +0100
 206 +++ linux-rpi-3.10.y/drivers/thermal/Makefile   2013-07-06 15:25:50.000000000 +0100
 207 @@ -23,4 +23,5 @@
 208  obj-$(CONFIG_ARMADA_THERMAL)   += armada_thermal.o
 209  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
 210  obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
 211 +obj-$(CONFIG_THERMAL_BCM2835)  += bcm2835-thermal.o
 212