linux/drivers/thermal/st/st_thermal_memmap.c
Srinivas Pandruvada 0e70f466fb thermal: Enhance thermal_zone_device_update for events
Added one additional parameter to thermal_zone_device_update() to provide
caller with an optional capability to specify reason.
Currently this event is used by user space governor to trigger different
processing based on event code. Also it saves an additional call to read
temperature when the event is received.
The following events are cuurently defined:
- Unspecified event
- New temperature sample
- Trip point violated
- Trip point changed
- thermal device up and down
- thermal device power capability changed

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2016-09-27 14:35:21 +08:00

210 lines
5.9 KiB
C

/*
* ST Thermal Sensor Driver for memory mapped sensors.
* Author: Ajit Pal Singh <ajitpal.singh@st.com>
*
* Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/of.h>
#include <linux/module.h>
#include "st_thermal.h"
#define STIH416_MPE_CONF 0x0
#define STIH416_MPE_STATUS 0x4
#define STIH416_MPE_INT_THRESH 0x8
#define STIH416_MPE_INT_EN 0xC
/* Power control bits for the memory mapped thermal sensor */
#define THERMAL_PDN BIT(4)
#define THERMAL_SRSTN BIT(10)
static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = {
/*
* According to the STIH416 MPE temp sensor data sheet -
* the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be
* written simultaneously for powering on and off the temperature
* sensor. regmap_update_bits() will be used to update the register.
*/
[INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7),
[DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9),
[OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9),
[DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18),
[INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0),
};
static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)
{
struct st_thermal_sensor *sensor = sdata;
thermal_zone_device_update(sensor->thermal_dev,
THERMAL_EVENT_UNSPECIFIED);
return IRQ_HANDLED;
}
/* Private ops for the Memory Mapped based thermal sensors */
static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor,
enum st_thermal_power_state power_state)
{
const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN);
const unsigned int val = power_state ? mask : 0;
return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val);
}
static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor)
{
struct device *dev = sensor->dev;
struct regmap *regmap = sensor->regmap;
const struct reg_field *reg_fields = sensor->cdata->reg_fields;
sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap,
reg_fields[INT_THRESH_HI]);
sensor->int_enable = devm_regmap_field_alloc(dev, regmap,
reg_fields[INT_ENABLE]);
if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) {
dev_err(dev, "failed to alloc mmap regfields\n");
return -EINVAL;
}
return 0;
}
static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)
{
int ret;
/* Set upper critical threshold */
ret = regmap_field_write(sensor->int_thresh_hi,
sensor->cdata->crit_temp -
sensor->cdata->temp_adjust_val);
if (ret)
return ret;
return regmap_field_write(sensor->int_enable, 1);
}
static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor)
{
struct device *dev = sensor->dev;
struct platform_device *pdev = to_platform_device(dev);
int ret;
sensor->irq = platform_get_irq(pdev, 0);
if (sensor->irq < 0) {
dev_err(dev, "failed to register IRQ\n");
return sensor->irq;
}
ret = devm_request_threaded_irq(dev, sensor->irq,
NULL, st_mmap_thermal_trip_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
dev->driver->name, sensor);
if (ret) {
dev_err(dev, "failed to register IRQ %d\n", sensor->irq);
return ret;
}
return st_mmap_enable_irq(sensor);
}
static const struct regmap_config st_416mpe_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)
{
struct device *dev = sensor->dev;
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "no memory resources defined\n");
return -ENODEV;
}
sensor->mmio_base = devm_ioremap_resource(dev, res);
if (IS_ERR(sensor->mmio_base)) {
dev_err(dev, "failed to remap IO\n");
return PTR_ERR(sensor->mmio_base);
}
sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,
&st_416mpe_regmap_config);
if (IS_ERR(sensor->regmap)) {
dev_err(dev, "failed to initialise regmap\n");
return PTR_ERR(sensor->regmap);
}
return 0;
}
static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {
.power_ctrl = st_mmap_power_ctrl,
.alloc_regfields = st_mmap_alloc_regfields,
.regmap_init = st_mmap_regmap_init,
.register_enable_irq = st_mmap_register_enable_irq,
.enable_irq = st_mmap_enable_irq,
};
/* Compatible device data stih416 mpe thermal sensor */
static const struct st_thermal_compat_data st_416mpe_cdata = {
.reg_fields = st_mmap_thermal_regfields,
.ops = &st_mmap_sensor_ops,
.calibration_val = 14,
.temp_adjust_val = -95,
.crit_temp = 120,
};
/* Compatible device data stih407 thermal sensor */
static const struct st_thermal_compat_data st_407_cdata = {
.reg_fields = st_mmap_thermal_regfields,
.ops = &st_mmap_sensor_ops,
.calibration_val = 16,
.temp_adjust_val = -95,
.crit_temp = 120,
};
static const struct of_device_id st_mmap_thermal_of_match[] = {
{ .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
{ .compatible = "st,stih407-thermal", .data = &st_407_cdata },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);
static int st_mmap_probe(struct platform_device *pdev)
{
return st_thermal_register(pdev, st_mmap_thermal_of_match);
}
static int st_mmap_remove(struct platform_device *pdev)
{
return st_thermal_unregister(pdev);
}
static struct platform_driver st_mmap_thermal_driver = {
.driver = {
.name = "st_thermal_mmap",
.pm = &st_thermal_pm_ops,
.of_match_table = st_mmap_thermal_of_match,
},
.probe = st_mmap_probe,
.remove = st_mmap_remove,
};
module_platform_driver(st_mmap_thermal_driver);
MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
MODULE_LICENSE("GPL v2");