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Add a sysctl to read the internal temperature of the AXP209 Power

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Management IC.

Submitted by:	Jared McNeill <jmcneill@invisible.ca>
Differential Revision:	https://reviews.freebsd.org/D5298
This commit is contained in:
Andrew Turner 2016-02-16 11:51:54 +00:00
parent ba9b71631d
commit 86914a0f9b
1 changed files with 41 additions and 0 deletions
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41
sys/arm/allwinner/axp209.c
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@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
@ -62,11 +63,23 @@ __FBSDID("$FreeBSD$");
#define AXP209_SHUTBAT 0x32
#define AXP209_SHUTBAT_SHUTDOWN 0x80
/* Temperature monitor */
#define AXP209_TEMPMON 0x5e
#define AXP209_TEMPMON_H(a) ((a) << 4)
#define AXP209_TEMPMON_L(a) ((a) & 0xf)
#define AXP209_TEMPMON_MIN 1447 /* -144.7C */
#define AXP209_0C_TO_K 2732
struct axp209_softc {
uint32_t addr;
struct intr_config_hook enum_hook;
};
enum axp209_sensor {
AXP209_TEMP
};
static int
axp209_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
{
@ -104,6 +117,28 @@ axp209_write(device_t dev, uint8_t reg, uint8_t data)
return (iicbus_transfer(dev, &msg, 1));
}
static int
axp209_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t dev = arg1;
enum axp209_sensor sensor = arg2;
uint8_t data[2];
int val, error;
if (sensor != AXP209_TEMP)
return (ENOENT);
error = axp209_read(dev, AXP209_TEMPMON, data, 2);
if (error != 0)
return (error);
/* Temperature is between -144.7C and 264.8C, step +0.1C */
val = (AXP209_TEMPMON_H(data[0]) | AXP209_TEMPMON_L(data[1])) -
AXP209_TEMPMON_MIN + AXP209_0C_TO_K;
return sysctl_handle_opaque(oidp, &val, sizeof(val), req);
}
static void
axp209_shutdown(void *devp, int howto)
{
@ -163,6 +198,12 @@ axp209_attach(device_t dev)
EVENTHANDLER_REGISTER(shutdown_final, axp209_shutdown, dev,
SHUTDOWN_PRI_LAST);
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "temp",
CTLTYPE_INT | CTLFLAG_RD,
dev, AXP209_TEMP, axp209_sysctl, "IK", "Internal temperature");
return (0);
}