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hwmon: ab8500: Convert to IIO ADC 

This switches the AB8500 hardware monitor driver to using
the standard IIO ADC channel lookup and conversion routines.

Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
alistair/sunxi64-5.5-dsi
Linus Walleij 2019-10-11 09:18:02 +02:00 committed by Jonathan Cameron
parent 1e82623c3c
commit d17e86cb16
2 changed files with 43 additions and 25 deletions
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3
drivers/hwmon/Kconfig
View File

@ -40,7 +40,8 @@ comment "Native drivers"
config SENSORS_AB8500
tristate "AB8500 thermal monitoring"
depends on AB8500_GPADC && AB8500_BM
depends on AB8500_GPADC && AB8500_BM && (IIO = y)
default n
help
If you say yes here you get support for the thermal sensor part
of the AB8500 chip. The driver includes thermal management for

65
drivers/hwmon/ab8500.c
View File

@ -17,20 +17,24 @@
#include <linux/hwmon-sysfs.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power/ab8500.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/iio/consumer.h>
#include "abx500.h"
#define DEFAULT_POWER_OFF_DELAY (HZ * 10)
#define THERMAL_VCC 1800
#define PULL_UP_RESISTOR 47000
/* Number of monitored sensors should not greater than NUM_SENSORS */
#define NUM_MONITORED_SENSORS 4
#define AB8500_SENSOR_AUX1 0
#define AB8500_SENSOR_AUX2 1
#define AB8500_SENSOR_BTEMP_BALL 2
#define AB8500_SENSOR_BAT_CTRL 3
#define NUM_MONITORED_SENSORS 4
struct ab8500_gpadc_cfg {
const struct abx500_res_to_temp *temp_tbl;
@ -40,7 +44,8 @@ struct ab8500_gpadc_cfg {
};
struct ab8500_temp {
struct ab8500_gpadc *gpadc;
struct iio_channel *aux1;
struct iio_channel *aux2;
struct ab8500_btemp *btemp;
struct delayed_work power_off_work;
struct ab8500_gpadc_cfg cfg;
@ -82,15 +87,21 @@ static int ab8500_read_sensor(struct abx500_temp *data, u8 sensor, int *temp)
int voltage, ret;
struct ab8500_temp *ab8500_data = data->plat_data;
if (sensor == BAT_CTRL) {
*temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp);
} else if (sensor == BTEMP_BALL) {
if (sensor == AB8500_SENSOR_BTEMP_BALL) {
*temp = ab8500_btemp_get_temp(ab8500_data->btemp);
} else {
voltage = ab8500_gpadc_convert(ab8500_data->gpadc, sensor);
if (voltage < 0)
return voltage;
} else if (sensor == AB8500_SENSOR_BAT_CTRL) {
*temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp);
} else if (sensor == AB8500_SENSOR_AUX1) {
ret = iio_read_channel_processed(ab8500_data->aux1, &voltage);
if (ret < 0)
return ret;
ret = ab8500_voltage_to_temp(&ab8500_data->cfg, voltage, temp);
if (ret < 0)
return ret;
} else if (sensor == AB8500_SENSOR_AUX2) {
ret = iio_read_channel_processed(ab8500_data->aux2, &voltage);
if (ret < 0)
return ret;
ret = ab8500_voltage_to_temp(&ab8500_data->cfg, voltage, temp);
if (ret < 0)
return ret;
@ -164,10 +175,6 @@ int abx500_hwmon_init(struct abx500_temp *data)
if (!ab8500_data)
return -ENOMEM;
ab8500_data->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
if (IS_ERR(ab8500_data->gpadc))
return PTR_ERR(ab8500_data->gpadc);
ab8500_data->btemp = ab8500_btemp_get();
if (IS_ERR(ab8500_data->btemp))
return PTR_ERR(ab8500_data->btemp);
@ -181,15 +188,25 @@ int abx500_hwmon_init(struct abx500_temp *data)
ab8500_data->cfg.tbl_sz = ab8500_temp_tbl_a_size;
data->plat_data = ab8500_data;
ab8500_data->aux1 = devm_iio_channel_get(&data->pdev->dev, "aux1");
if (IS_ERR(ab8500_data->aux1)) {
if (PTR_ERR(ab8500_data->aux1) == -ENODEV)
return -EPROBE_DEFER;
dev_err(&data->pdev->dev, "failed to get AUX1 ADC channel\n");
return PTR_ERR(ab8500_data->aux1);
}
ab8500_data->aux2 = devm_iio_channel_get(&data->pdev->dev, "aux2");
if (IS_ERR(ab8500_data->aux2)) {
if (PTR_ERR(ab8500_data->aux2) == -ENODEV)
return -EPROBE_DEFER;
dev_err(&data->pdev->dev, "failed to get AUX2 ADC channel\n");
return PTR_ERR(ab8500_data->aux2);
}
/*
* ADC_AUX1 and ADC_AUX2, connected to external NTC
* BTEMP_BALL and BAT_CTRL, fixed usage
*/
data->gpadc_addr[0] = ADC_AUX1;
data->gpadc_addr[1] = ADC_AUX2;
data->gpadc_addr[2] = BTEMP_BALL;
data->gpadc_addr[3] = BAT_CTRL;
data->gpadc_addr[0] = AB8500_SENSOR_AUX1;
data->gpadc_addr[1] = AB8500_SENSOR_AUX2;
data->gpadc_addr[2] = AB8500_SENSOR_BTEMP_BALL;
data->gpadc_addr[3] = AB8500_SENSOR_BAT_CTRL;
data->monitored_sensors = NUM_MONITORED_SENSORS;
data->ops.read_sensor = ab8500_read_sensor;