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Immutable branch between MFD and HWMON due for the v5.8 merge window

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Merge tag 'ib-mfd-hwmon-v5.8' into hwmon-next

Immutable branch between MFD and HWMON due for the v5.8 merge window
This commit is contained in:
Guenter Roeck 2020-05-22 06:29:55 -07:00
commit 8054eadca7
12 changed files with 1074 additions and 0 deletions
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196
Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml Normal file
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@ -0,0 +1,196 @@
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/mfd/gateworks-gsc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Gateworks System Controller
description: |
The Gateworks System Controller (GSC) is a device present across various
Gateworks product families that provides a set of system related features
such as the following (refer to the board hardware user manuals to see what
features are present)
- Watchdog Timer
- GPIO
- Pushbutton controller
- Hardware monitor with ADC's for temperature and voltage rails and
fan controller
maintainers:
- Tim Harvey <tharvey@gateworks.com>
- Robert Jones <rjones@gateworks.com>
properties:
$nodename:
pattern: "gsc@[0-9a-f]{1,2}"
compatible:
const: gw,gsc
reg:
description: I2C device address
maxItems: 1
interrupts:
maxItems: 1
interrupt-controller: true
"#interrupt-cells":
const: 1
"#address-cells":
const: 1
"#size-cells":
const: 0
adc:
type: object
description: Optional hardware monitoring module
properties:
compatible:
const: gw,gsc-adc
"#address-cells":
const: 1
"#size-cells":
const: 0
patternProperties:
"^channel@[0-9]+$":
type: object
description: |
Properties for a single ADC which can report cooked values
(i.e. temperature sensor based on thermister), raw values
(i.e. voltage rail with a pre-scaling resistor divider).
properties:
reg:
description: Register of the ADC
maxItems: 1
label:
description: Name of the ADC input
gw,mode:
description: |
conversion mode:
0 - temperature, in C*10
1 - pre-scaled voltage value
2 - scaled voltage based on an optional resistor divider
and optional offset
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2]
gw,voltage-divider-ohms:
description: Values of resistors for divider on raw ADC input
maxItems: 2
items:
minimum: 1000
maximum: 1000000
gw,voltage-offset-microvolt:
description: |
A positive voltage offset to apply to a raw ADC
(i.e. to compensate for a diode drop).
minimum: 0
maximum: 1000000
required:
- gw,mode
- reg
- label
required:
- compatible
- "#address-cells"
- "#size-cells"
patternProperties:
"^fan-controller@[0-9a-f]+$":
type: object
description: Optional fan controller
properties:
compatible:
const: gw,gsc-fan
"#address-cells":
const: 1
"#size-cells":
const: 0
reg:
description: The fan controller base address
maxItems: 1
required:
- compatible
- reg
- "#address-cells"
- "#size-cells"
required:
- compatible
- reg
- interrupts
- interrupt-controller
- "#interrupt-cells"
- "#address-cells"
- "#size-cells"
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
gsc@20 {
compatible = "gw,gsc";
reg = <0x20>;
interrupt-parent = <&gpio1>;
interrupts = <4 GPIO_ACTIVE_LOW>;
interrupt-controller;
#interrupt-cells = <1>;
#address-cells = <1>;
#size-cells = <0>;
adc {
compatible = "gw,gsc-adc";
#address-cells = <1>;
#size-cells = <0>;
channel@0 { /* A0: Board Temperature */
reg = <0x00>;
label = "temp";
gw,mode = <0>;
};
channel@2 { /* A1: Input Voltage (raw ADC) */
reg = <0x02>;
label = "vdd_vin";
gw,mode = <1>;
gw,voltage-divider-ohms = <22100 1000>;
gw,voltage-offset-microvolt = <800000>;
};
channel@b { /* A2: Battery voltage */
reg = <0x0b>;
label = "vdd_bat";
gw,mode = <1>;
};
};
fan-controller@2c {
#address-cells = <1>;
#size-cells = <0>;
compatible = "gw,gsc-fan";
reg = <0x2c>;
};
};
};

53
Documentation/hwmon/gsc-hwmon.rst Normal file
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@ -0,0 +1,53 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver gsc-hwmon
=======================
Supported chips: Gateworks GSC
Datasheet: http://trac.gateworks.com/wiki/gsc
Author: Tim Harvey <tharvey@gateworks.com>
Description:
------------
This driver supports hardware monitoring for the temperature sensor,
various ADC's connected to the GSC, and optional FAN controller available
on some boards.
Voltage Monitoring
------------------
The voltage inputs are scaled either internally or by the driver depending
on the GSC version and firmware. The values returned by the driver do not need
further scaling. The voltage input labels provide the voltage rail name:
inX_input Measured voltage (mV).
inX_label Name of voltage rail.
Temperature Monitoring
----------------------
Temperatures are measured with 12-bit or 10-bit resolution and are scaled
either internally or by the driver depending on the GSC version and firmware.
The values returned by the driver reflect millidegree Celcius:
tempX_input Measured temperature.
tempX_label Name of temperature input.
PWM Output Control
------------------
The GSC features 1 PWM output that operates in automatic mode where the
PWM value will be scalled depending on 6 temperature boundaries.
The tempeature boundaries are read-write and in millidegree Celcius and the
read-only PWM values range from 0 (off) to 255 (full speed).
Fan speed will be set to minimum (off) when the temperature sensor reads
less than pwm1_auto_point1_temp and maximum when the temperature sensor
equals or exceeds pwm1_auto_point6_temp.
pwm1_auto_point[1-6]_pwm PWM value.
pwm1_auto_point[1-6]_temp Temperature boundary.

1
Documentation/hwmon/index.rst
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@ -61,6 +61,7 @@ Hardware Monitoring Kernel Drivers
ftsteutates
g760a
g762
gsc-hwmon
gl518sm
hih6130
ibmaem

11
MAINTAINERS
View File

@ -7035,6 +7035,17 @@ F: kernel/futex.c
F: tools/perf/bench/futex*
F: tools/testing/selftests/futex/
GATEWORKS SYSTEM CONTROLLER (GSC) DRIVER
M: Tim Harvey <tharvey@gateworks.com>
M: Robert Jones <rjones@gateworks.com>
S: Maintained
F: Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml
F: drivers/mfd/gateworks-gsc.c
F: include/linux/mfd/gsc.h
F: Documentation/hwmon/gsc-hwmon.rst
F: drivers/hwmon/gsc-hwmon.c
F: include/linux/platform_data/gsc_hwmon.h
GASKET DRIVER FRAMEWORK
M: Rob Springer <rspringer@google.com>
M: Todd Poynor <toddpoynor@google.com>

9
drivers/hwmon/Kconfig
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@ -533,6 +533,15 @@ config SENSORS_F75375S
This driver can also be built as a module. If so, the module
will be called f75375s.
config SENSORS_GSC
tristate "Gateworks System Controller ADC"
depends on MFD_GATEWORKS_GSC
help
Support for the Gateworks System Controller A/D converters.
To compile this driver as a module, choose M here:
the module will be called gsc-hwmon.
config SENSORS_MC13783_ADC
tristate "Freescale MC13783/MC13892 ADC"
depends on MFD_MC13XXX

1
drivers/hwmon/Makefile
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@ -75,6 +75,7 @@ obj-$(CONFIG_SENSORS_G760A) += g760a.o
obj-$(CONFIG_SENSORS_G762) += g762.o
obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
obj-$(CONFIG_SENSORS_GSC) += gsc-hwmon.o
obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
obj-$(CONFIG_SENSORS_HIH6130) += hih6130.o
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o

390
drivers/hwmon/gsc-hwmon.c Normal file
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@ -0,0 +1,390 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Gateworks System Controller Hardware Monitor module
*
* Copyright (C) 2020 Gateworks Corporation
*/
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/mfd/gsc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/platform_data/gsc_hwmon.h>
#define GSC_HWMON_MAX_TEMP_CH 16
#define GSC_HWMON_MAX_IN_CH 16
#define GSC_HWMON_RESOLUTION 12
#define GSC_HWMON_VREF 2500
struct gsc_hwmon_data {
struct gsc_dev *gsc;
struct gsc_hwmon_platform_data *pdata;
struct regmap *regmap;
const struct gsc_hwmon_channel *temp_ch[GSC_HWMON_MAX_TEMP_CH];
const struct gsc_hwmon_channel *in_ch[GSC_HWMON_MAX_IN_CH];
u32 temp_config[GSC_HWMON_MAX_TEMP_CH + 1];
u32 in_config[GSC_HWMON_MAX_IN_CH + 1];
struct hwmon_channel_info temp_info;
struct hwmon_channel_info in_info;
const struct hwmon_channel_info *info[3];
struct hwmon_chip_info chip;
};
static struct regmap_bus gsc_hwmon_regmap_bus = {
.reg_read = gsc_read,
.reg_write = gsc_write,
};
static const struct regmap_config gsc_hwmon_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_NONE,
};
static ssize_t pwm_auto_point_temp_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
u8 regs[2];
int ret;
ret = regmap_bulk_read(hwmon->regmap, reg, regs, 2);
if (ret)
return ret;
ret = regs[0] | regs[1] << 8;
return sprintf(buf, "%d\n", ret * 10);
}
static ssize_t pwm_auto_point_temp_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
u8 regs[2];
long temp;
int err;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, 0, 10000);
temp = DIV_ROUND_CLOSEST(temp, 10);
regs[0] = temp & 0xff;
regs[1] = (temp >> 8) & 0xff;
err = regmap_bulk_write(hwmon->regmap, reg, regs, 2);
if (err)
return err;
return count;
}
static ssize_t pwm_auto_point_pwm_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)) / 100);
}
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm_auto_point_pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_auto_point_temp, 0);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_pwm, pwm_auto_point_pwm, 1);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, pwm_auto_point_temp, 1);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm_auto_point_pwm, 2);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, pwm_auto_point_temp, 2);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point4_pwm, pwm_auto_point_pwm, 3);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, pwm_auto_point_temp, 3);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm_auto_point_pwm, 4);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point5_temp, pwm_auto_point_temp, 4);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point6_pwm, pwm_auto_point_pwm, 5);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point6_temp, pwm_auto_point_temp, 5);
static struct attribute *gsc_hwmon_attributes[] = {
&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
NULL
};
static const struct attribute_group gsc_hwmon_group = {
.attrs = gsc_hwmon_attributes,
};
__ATTRIBUTE_GROUPS(gsc_hwmon);
static int
gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
int channel, long *val)
{
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
const struct gsc_hwmon_channel *ch;
int sz, ret;
long tmp;
u8 buf[3];
switch (type) {
case hwmon_in:
ch = hwmon->in_ch[channel];
break;
case hwmon_temp:
ch = hwmon->temp_ch[channel];
break;
default:
return -EOPNOTSUPP;
}
sz = (ch->mode == mode_voltage) ? 3 : 2;
ret = regmap_bulk_read(hwmon->regmap, ch->reg, buf, sz);
if (ret)
return ret;
tmp = 0;
while (sz-- > 0)
tmp |= (buf[sz] << (8 * sz));
switch (ch->mode) {
case mode_temperature:
if (tmp > 0x8000)
tmp -= 0xffff;
break;
case mode_voltage_raw:
tmp = clamp_val(tmp, 0, BIT(GSC_HWMON_RESOLUTION));
/* scale based on ref voltage and ADC resolution */
tmp *= GSC_HWMON_VREF;
tmp >>= GSC_HWMON_RESOLUTION;
/* scale based on optional voltage divider */
if (ch->vdiv[0] && ch->vdiv[1]) {
tmp *= (ch->vdiv[0] + ch->vdiv[1]);
tmp /= ch->vdiv[1];
}
/* adjust by uV offset */
tmp += ch->mvoffset;
break;
case mode_voltage:
/* no adjustment needed */
break;
}
*val = tmp;
return 0;
}
static int
gsc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **buf)
{
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
switch (type) {
case hwmon_in:
*buf = hwmon->in_ch[channel]->name;
break;
case hwmon_temp:
*buf = hwmon->temp_ch[channel]->name;
break;
default:
return -ENOTSUPP;
}
return 0;
}
static umode_t
gsc_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
int ch)
{
return 0444;
}
static const struct hwmon_ops gsc_hwmon_ops = {
.is_visible = gsc_hwmon_is_visible,
.read = gsc_hwmon_read,
.read_string = gsc_hwmon_read_string,
};
static struct gsc_hwmon_platform_data *
gsc_hwmon_get_devtree_pdata(struct device *dev)
{
struct gsc_hwmon_platform_data *pdata;
struct gsc_hwmon_channel *ch;
struct fwnode_handle *child;
struct device_node *fan;
int nchannels;
nchannels = device_get_child_node_count(dev);
if (nchannels == 0)
return ERR_PTR(-ENODEV);
pdata = devm_kzalloc(dev,
sizeof(*pdata) + nchannels * sizeof(*ch),
GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
ch = (struct gsc_hwmon_channel *)(pdata + 1);
pdata->channels = ch;
pdata->nchannels = nchannels;
/* fan controller base address */
fan = of_find_compatible_node(dev->parent->of_node, NULL, "gw,gsc-fan");
if (fan && of_property_read_u32(fan, "reg", &pdata->fan_base)) {
dev_err(dev, "fan node without base\n");
return ERR_PTR(-EINVAL);
}
/* allocate structures for channels and count instances of each type */
device_for_each_child_node(dev, child) {
if (fwnode_property_read_string(child, "label", &ch->name)) {
dev_err(dev, "channel without label\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
if (fwnode_property_read_u32(child, "reg", &ch->reg)) {
dev_err(dev, "channel without reg\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
if (fwnode_property_read_u32(child, "gw,mode", &ch->mode)) {
dev_err(dev, "channel without mode\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
if (ch->mode > mode_max) {
dev_err(dev, "invalid channel mode\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
if (!fwnode_property_read_u32(child,
"gw,voltage-offset-microvolt",
&ch->mvoffset))
ch->mvoffset /= 1000;
fwnode_property_read_u32_array(child,
"gw,voltage-divider-ohms",
ch->vdiv, ARRAY_SIZE(ch->vdiv));
ch++;
}
return pdata;
}
static int gsc_hwmon_probe(struct platform_device *pdev)
{
struct gsc_dev *gsc = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct device *hwmon_dev;
struct gsc_hwmon_platform_data *pdata = dev_get_platdata(dev);
struct gsc_hwmon_data *hwmon;
const struct attribute_group **groups;
int i, i_in, i_temp;
if (!pdata) {
pdata = gsc_hwmon_get_devtree_pdata(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
hwmon->gsc = gsc;
hwmon->pdata = pdata;
hwmon->regmap = devm_regmap_init(dev, &gsc_hwmon_regmap_bus,
gsc->i2c_hwmon,
&gsc_hwmon_regmap_config);
if (IS_ERR(hwmon->regmap))
return PTR_ERR(hwmon->regmap);
for (i = 0, i_in = 0, i_temp = 0; i < hwmon->pdata->nchannels; i++) {
const struct gsc_hwmon_channel *ch = &pdata->channels[i];
switch (ch->mode) {
case mode_temperature:
if (i_temp == GSC_HWMON_MAX_TEMP_CH) {
dev_err(gsc->dev, "too many temp channels\n");
return -EINVAL;
}
hwmon->temp_ch[i_temp] = ch;
hwmon->temp_config[i_temp] = HWMON_T_INPUT |
HWMON_T_LABEL;
i_temp++;
break;
case mode_voltage:
case mode_voltage_raw:
if (i_in == GSC_HWMON_MAX_IN_CH) {
dev_err(gsc->dev, "too many input channels\n");
return -EINVAL;
}
hwmon->in_ch[i_in] = ch;
hwmon->in_config[i_in] =
HWMON_I_INPUT | HWMON_I_LABEL;
i_in++;
break;
default:
dev_err(gsc->dev, "invalid mode: %d\n", ch->mode);
return -EINVAL;
}
}
/* setup config structures */
hwmon->chip.ops = &gsc_hwmon_ops;
hwmon->chip.info = hwmon->info;
hwmon->info[0] = &hwmon->temp_info;
hwmon->info[1] = &hwmon->in_info;
hwmon->temp_info.type = hwmon_temp;
hwmon->temp_info.config = hwmon->temp_config;
hwmon->in_info.type = hwmon_in;
hwmon->in_info.config = hwmon->in_config;
groups = pdata->fan_base ? gsc_hwmon_groups : NULL;
hwmon_dev = devm_hwmon_device_register_with_info(dev,
KBUILD_MODNAME, hwmon,
&hwmon->chip, groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct of_device_id gsc_hwmon_of_match[] = {
{ .compatible = "gw,gsc-adc", },
{}
};
static struct platform_driver gsc_hwmon_driver = {
.driver = {
.name = "gsc-hwmon",
.of_match_table = gsc_hwmon_of_match,
},
.probe = gsc_hwmon_probe,
};
module_platform_driver(gsc_hwmon_driver);
MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
MODULE_DESCRIPTION("GSC hardware monitor driver");
MODULE_LICENSE("GPL v2");

15
drivers/mfd/Kconfig
View File

@ -407,6 +407,21 @@ config MFD_EXYNOS_LPASS
Select this option to enable support for Samsung Exynos Low Power
Audio Subsystem.
config MFD_GATEWORKS_GSC
tristate "Gateworks System Controller"
depends on (I2C && OF)
select MFD_CORE
select REGMAP_I2C
select REGMAP_IRQ
help
Enable support for the Gateworks System Controller (GSC) found
on Gateworks Single Board Computers supporting system functions
such as push-button monitor, multiple ADC's for voltage and
temperature monitoring, fan controller and watchdog monitor.
This driver provides common support for accessing the device.
Additional drivers must be enabled in order to use the
functionality of the device.
config MFD_MC13XXX
tristate
depends on (SPI_MASTER || I2C)

1
drivers/mfd/Makefile
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@ -15,6 +15,7 @@ obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o
obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o
obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o
obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o
obj-$(CONFIG_MFD_GATEWORKS_GSC) += gateworks-gsc.o
obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o

277
drivers/mfd/gateworks-gsc.c Normal file
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@ -0,0 +1,277 @@
// SPDX-License-Identifier: GPL-2.0
/*
* The Gateworks System Controller (GSC) is a multi-function
* device designed for use in Gateworks Single Board Computers.
* The control interface is I2C, with an interrupt. The device supports
* system functions such as push-button monitoring, multiple ADC's for
* voltage and temperature monitoring, fan controller and watchdog monitor.
*
* Copyright (C) 2020 Gateworks Corporation
*/
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/gsc.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <asm/unaligned.h>
/*
* The GSC suffers from an errata where occasionally during
* ADC cycles the chip can NAK I2C transactions. To ensure we have reliable
* register access we place retries around register access.
*/
#define I2C_RETRIES 3
int gsc_write(void *context, unsigned int reg, unsigned int val)
{
struct i2c_client *client = context;
int retry, ret;
for (retry = 0; retry < I2C_RETRIES; retry++) {
ret = i2c_smbus_write_byte_data(client, reg, val);
/*
* -EAGAIN returned when the i2c host controller is busy
* -EIO returned when i2c device is busy
*/
if (ret != -EAGAIN && ret != -EIO)
break;
}
return 0;
}
EXPORT_SYMBOL_GPL(gsc_write);
int gsc_read(void *context, unsigned int reg, unsigned int *val)
{
struct i2c_client *client = context;
int retry, ret;
for (retry = 0; retry < I2C_RETRIES; retry++) {
ret = i2c_smbus_read_byte_data(client, reg);
/*
* -EAGAIN returned when the i2c host controller is busy
* -EIO returned when i2c device is busy
*/
if (ret != -EAGAIN && ret != -EIO)
break;
}
*val = ret & 0xff;
return 0;
}
EXPORT_SYMBOL_GPL(gsc_read);
/*
* gsc_powerdown - API to use GSC to power down board for a specific time
*
* secs - number of seconds to remain powered off
*/
static int gsc_powerdown(struct gsc_dev *gsc, unsigned long secs)
{
int ret;
unsigned char regs[4];
dev_info(&gsc->i2c->dev, "GSC powerdown for %ld seconds\n",
secs);
put_unaligned_le32(secs, regs);
ret = regmap_bulk_write(gsc->regmap, GSC_TIME_ADD, regs, 4);
if (ret)
return ret;
ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,
BIT(GSC_CTRL_1_SLEEP_ADD),
BIT(GSC_CTRL_1_SLEEP_ADD));
if (ret)
return ret;
ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,
BIT(GSC_CTRL_1_SLEEP_ACTIVATE) |
BIT(GSC_CTRL_1_SLEEP_ENABLE),
BIT(GSC_CTRL_1_SLEEP_ACTIVATE) |
BIT(GSC_CTRL_1_SLEEP_ENABLE));
return ret;
}
static ssize_t gsc_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct gsc_dev *gsc = dev_get_drvdata(dev);
const char *name = attr->attr.name;
int rz = 0;
if (strcasecmp(name, "fw_version") == 0)
rz = sprintf(buf, "%d\n", gsc->fwver);
else if (strcasecmp(name, "fw_crc") == 0)
rz = sprintf(buf, "0x%04x\n", gsc->fwcrc);
else
dev_err(dev, "invalid command: '%s'\n", name);
return rz;
}
static ssize_t gsc_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct gsc_dev *gsc = dev_get_drvdata(dev);
const char *name = attr->attr.name;
long value;
if (strcasecmp(name, "powerdown") == 0) {
if (kstrtol(buf, 0, &value) == 0)
gsc_powerdown(gsc, value);
} else {
dev_err(dev, "invalid command: '%s\n", name);
}
return count;
}
static struct device_attribute attr_fwver =
__ATTR(fw_version, 0440, gsc_show, NULL);
static struct device_attribute attr_fwcrc =
__ATTR(fw_crc, 0440, gsc_show, NULL);
static struct device_attribute attr_pwrdown =
__ATTR(powerdown, 0220, NULL, gsc_store);
static struct attribute *gsc_attrs[] = {
&attr_fwver.attr,
&attr_fwcrc.attr,
&attr_pwrdown.attr,
NULL,
};
static struct attribute_group attr_group = {
.attrs = gsc_attrs,
};
static const struct of_device_id gsc_of_match[] = {
{ .compatible = "gw,gsc", },
{ }
};
MODULE_DEVICE_TABLE(of, gsc_of_match);
static struct regmap_bus gsc_regmap_bus = {
.reg_read = gsc_read,
.reg_write = gsc_write,
};
static const struct regmap_config gsc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_NONE,
.max_register = GSC_WP,
};
static const struct regmap_irq gsc_irqs[] = {
REGMAP_IRQ_REG(GSC_IRQ_PB, 0, BIT(GSC_IRQ_PB)),
REGMAP_IRQ_REG(GSC_IRQ_KEY_ERASED, 0, BIT(GSC_IRQ_KEY_ERASED)),
REGMAP_IRQ_REG(GSC_IRQ_EEPROM_WP, 0, BIT(GSC_IRQ_EEPROM_WP)),
REGMAP_IRQ_REG(GSC_IRQ_RESV, 0, BIT(GSC_IRQ_RESV)),
REGMAP_IRQ_REG(GSC_IRQ_GPIO, 0, BIT(GSC_IRQ_GPIO)),
REGMAP_IRQ_REG(GSC_IRQ_TAMPER, 0, BIT(GSC_IRQ_TAMPER)),
REGMAP_IRQ_REG(GSC_IRQ_WDT_TIMEOUT, 0, BIT(GSC_IRQ_WDT_TIMEOUT)),
REGMAP_IRQ_REG(GSC_IRQ_SWITCH_HOLD, 0, BIT(GSC_IRQ_SWITCH_HOLD)),
};
static const struct regmap_irq_chip gsc_irq_chip = {
.name = "gateworks-gsc",
.irqs = gsc_irqs,
.num_irqs = ARRAY_SIZE(gsc_irqs),
.num_regs = 1,
.status_base = GSC_IRQ_STATUS,
.mask_base = GSC_IRQ_ENABLE,
.mask_invert = true,
.ack_base = GSC_IRQ_STATUS,
.ack_invert = true,
};
static int gsc_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct gsc_dev *gsc;
struct regmap_irq_chip_data *irq_data;
int ret;
unsigned int reg;
gsc = devm_kzalloc(dev, sizeof(*gsc), GFP_KERNEL);
if (!gsc)
return -ENOMEM;
gsc->dev = &client->dev;
gsc->i2c = client;
i2c_set_clientdata(client, gsc);
gsc->regmap = devm_regmap_init(dev, &gsc_regmap_bus, client,
&gsc_regmap_config);
if (IS_ERR(gsc->regmap))
return PTR_ERR(gsc->regmap);
if (regmap_read(gsc->regmap, GSC_FW_VER, &reg))
return -EIO;
gsc->fwver = reg;
regmap_read(gsc->regmap, GSC_FW_CRC, &reg);
gsc->fwcrc = reg;
regmap_read(gsc->regmap, GSC_FW_CRC + 1, &reg);
gsc->fwcrc |= reg << 8;
gsc->i2c_hwmon = devm_i2c_new_dummy_device(dev, client->adapter,
GSC_HWMON);
if (IS_ERR(gsc->i2c_hwmon)) {
dev_err(dev, "Failed to allocate I2C device for HWMON\n");
return PTR_ERR(gsc->i2c_hwmon);
}
ret = devm_regmap_add_irq_chip(dev, gsc->regmap, client->irq,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING, 0,
&gsc_irq_chip, &irq_data);
if (ret)
return ret;
dev_info(dev, "Gateworks System Controller v%d: fw 0x%04x\n",
gsc->fwver, gsc->fwcrc);
ret = sysfs_create_group(&dev->kobj, &attr_group);
if (ret)
dev_err(dev, "failed to create sysfs attrs\n");
ret = devm_of_platform_populate(dev);
if (ret) {
sysfs_remove_group(&dev->kobj, &attr_group);
return ret;
}
return 0;
}
static int gsc_remove(struct i2c_client *client)
{
sysfs_remove_group(&client->dev.kobj, &attr_group);
return 0;
}
static struct i2c_driver gsc_driver = {
.driver = {
.name = "gateworks-gsc",
.of_match_table = gsc_of_match,
},
.probe_new = gsc_probe,
.remove = gsc_remove,
};
module_i2c_driver(gsc_driver);
MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
MODULE_DESCRIPTION("I2C Core interface for GSC");
MODULE_LICENSE("GPL v2");

76
include/linux/mfd/gsc.h Normal file
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@ -0,0 +1,76 @@
/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2020 Gateworks Corporation
*/
#ifndef __LINUX_MFD_GSC_H_
#define __LINUX_MFD_GSC_H_
#include <linux/regmap.h>
/* Device Addresses */
#define GSC_MISC 0x20
#define GSC_UPDATE 0x21
#define GSC_GPIO 0x23
#define GSC_HWMON 0x29
#define GSC_EEPROM0 0x50
#define GSC_EEPROM1 0x51
#define GSC_EEPROM2 0x52
#define GSC_EEPROM3 0x53
#define GSC_RTC 0x68
/* Register offsets */
enum {
GSC_CTRL_0 = 0x00,
GSC_CTRL_1 = 0x01,
GSC_TIME = 0x02,
GSC_TIME_ADD = 0x06,
GSC_IRQ_STATUS = 0x0A,
GSC_IRQ_ENABLE = 0x0B,
GSC_FW_CRC = 0x0C,
GSC_FW_VER = 0x0E,
GSC_WP = 0x0F,
};
/* Bit definitions */
#define GSC_CTRL_0_PB_HARD_RESET 0
#define GSC_CTRL_0_PB_CLEAR_SECURE_KEY 1
#define GSC_CTRL_0_PB_SOFT_POWER_DOWN 2
#define GSC_CTRL_0_PB_BOOT_ALTERNATE 3
#define GSC_CTRL_0_PERFORM_CRC 4
#define GSC_CTRL_0_TAMPER_DETECT 5
#define GSC_CTRL_0_SWITCH_HOLD 6
#define GSC_CTRL_1_SLEEP_ENABLE 0
#define GSC_CTRL_1_SLEEP_ACTIVATE 1
#define GSC_CTRL_1_SLEEP_ADD 2
#define GSC_CTRL_1_SLEEP_NOWAKEPB 3
#define GSC_CTRL_1_WDT_TIME 4
#define GSC_CTRL_1_WDT_ENABLE 5
#define GSC_CTRL_1_SWITCH_BOOT_ENABLE 6
#define GSC_CTRL_1_SWITCH_BOOT_CLEAR 7
#define GSC_IRQ_PB 0
#define GSC_IRQ_KEY_ERASED 1
#define GSC_IRQ_EEPROM_WP 2
#define GSC_IRQ_RESV 3
#define GSC_IRQ_GPIO 4
#define GSC_IRQ_TAMPER 5
#define GSC_IRQ_WDT_TIMEOUT 6
#define GSC_IRQ_SWITCH_HOLD 7
int gsc_read(void *context, unsigned int reg, unsigned int *val);
int gsc_write(void *context, unsigned int reg, unsigned int val);
struct gsc_dev {
struct device *dev;
struct i2c_client *i2c; /* 0x20: interrupt controller, WDT */
struct i2c_client *i2c_hwmon; /* 0x29: hwmon, fan controller */
struct regmap *regmap;
unsigned int fwver;
unsigned short fwcrc;
};
#endif /* __LINUX_MFD_GSC_H_ */

44
include/linux/platform_data/gsc_hwmon.h Normal file
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@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _GSC_HWMON_H
#define _GSC_HWMON_H
enum gsc_hwmon_mode {
mode_temperature,
mode_voltage,
mode_voltage_raw,
mode_max,
};
/**
* struct gsc_hwmon_channel - configuration parameters
* @reg: I2C register offset
* @mode: channel mode
* @name: channel name
* @mvoffset: voltage offset
* @vdiv: voltage divider array (2 resistor values in milli-ohms)
*/
struct gsc_hwmon_channel {
unsigned int reg;
unsigned int mode;
const char *name;
unsigned int mvoffset;
unsigned int vdiv[2];
};
/**
* struct gsc_hwmon_platform_data - platform data for gsc_hwmon driver
* @channels: pointer to array of gsc_hwmon_channel structures
* describing channels
* @nchannels: number of elements in @channels array
* @vreference: voltage reference (mV)
* @resolution: ADC bit resolution
* @fan_base: register base for FAN controller
*/
struct gsc_hwmon_platform_data {
const struct gsc_hwmon_channel *channels;
int nchannels;
unsigned int resolution;
unsigned int vreference;
unsigned int fan_base;
};
#endif