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path: root/drivers/hwmon/ab8500.c
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Diffstat (limited to 'drivers/hwmon/ab8500.c')
-rw-r--r--drivers/hwmon/ab8500.c224
1 files changed, 0 insertions, 224 deletions
diff --git a/drivers/hwmon/ab8500.c b/drivers/hwmon/ab8500.c
deleted file mode 100644
index 53f3379d799d..000000000000
--- a/drivers/hwmon/ab8500.c
+++ /dev/null
@@ -1,224 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) ST-Ericsson 2010 - 2013
- * Author: Martin Persson <martin.persson@stericsson.com>
- * Hongbo Zhang <hongbo.zhang@linaro.org>
- *
- * When the AB8500 thermal warning temperature is reached (threshold cannot
- * be changed by SW), an interrupt is set, and if no further action is taken
- * within a certain time frame, kernel_power_off will be called.
- *
- * When AB8500 thermal shutdown temperature is reached a hardware shutdown of
- * the AB8500 will occur.
- */
-
-#include <linux/err.h>
-#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
-#include <linux/mfd/abx500.h>
-#include <linux/mfd/abx500/ab8500-bm.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
-
-#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;
- int tbl_sz;
- int vcc;
- int r_up;
-};
-
-struct ab8500_temp {
- struct iio_channel *aux1;
- struct iio_channel *aux2;
- struct ab8500_btemp *btemp;
- struct delayed_work power_off_work;
- struct ab8500_gpadc_cfg cfg;
- struct abx500_temp *abx500_data;
-};
-
-/*
- * The hardware connection is like this:
- * VCC----[ R_up ]-----[ NTC ]----GND
- * where R_up is pull-up resistance, and GPADC measures voltage on NTC.
- * and res_to_temp table is strictly sorted by falling resistance values.
- */
-static int ab8500_voltage_to_temp(struct ab8500_gpadc_cfg *cfg,
- int v_ntc, int *temp)
-{
- int r_ntc, i = 0, tbl_sz = cfg->tbl_sz;
- const struct abx500_res_to_temp *tbl = cfg->temp_tbl;
-
- if (cfg->vcc < 0 || v_ntc >= cfg->vcc)
- return -EINVAL;
-
- r_ntc = v_ntc * cfg->r_up / (cfg->vcc - v_ntc);
- if (r_ntc > tbl[0].resist || r_ntc < tbl[tbl_sz - 1].resist)
- return -EINVAL;
-
- while (!(r_ntc <= tbl[i].resist && r_ntc > tbl[i + 1].resist) &&
- i < tbl_sz - 2)
- i++;
-
- /* return milli-Celsius */
- *temp = tbl[i].temp * 1000 + ((tbl[i + 1].temp - tbl[i].temp) * 1000 *
- (r_ntc - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
-
- return 0;
-}
-
-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 == AB8500_SENSOR_BTEMP_BALL) {
- *temp = ab8500_btemp_get_temp(ab8500_data->btemp);
- } 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;
- }
-
- return 0;
-}
-
-static void ab8500_thermal_power_off(struct work_struct *work)
-{
- struct ab8500_temp *ab8500_data = container_of(work,
- struct ab8500_temp, power_off_work.work);
- struct abx500_temp *abx500_data = ab8500_data->abx500_data;
-
- dev_warn(&abx500_data->pdev->dev, "Power off due to critical temp\n");
-
- kernel_power_off();
-}
-
-static ssize_t ab8500_show_name(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- return sprintf(buf, "ab8500\n");
-}
-
-static ssize_t ab8500_show_label(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- char *label;
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- int index = attr->index;
-
- switch (index) {
- case 1:
- label = "ext_adc1";
- break;
- case 2:
- label = "ext_adc2";
- break;
- case 3:
- label = "bat_temp";
- break;
- case 4:
- label = "bat_ctrl";
- break;
- default:
- return -EINVAL;
- }
-
- return sprintf(buf, "%s\n", label);
-}
-
-static int ab8500_temp_irq_handler(int irq, struct abx500_temp *data)
-{
- struct ab8500_temp *ab8500_data = data->plat_data;
-
- dev_warn(&data->pdev->dev, "Power off in %d s\n",
- DEFAULT_POWER_OFF_DELAY / HZ);
-
- schedule_delayed_work(&ab8500_data->power_off_work,
- DEFAULT_POWER_OFF_DELAY);
- return 0;
-}
-
-int abx500_hwmon_init(struct abx500_temp *data)
-{
- struct ab8500_temp *ab8500_data;
-
- ab8500_data = devm_kzalloc(&data->pdev->dev, sizeof(*ab8500_data),
- GFP_KERNEL);
- if (!ab8500_data)
- return -ENOMEM;
-
- ab8500_data->btemp = ab8500_btemp_get();
- if (IS_ERR(ab8500_data->btemp))
- return PTR_ERR(ab8500_data->btemp);
-
- INIT_DELAYED_WORK(&ab8500_data->power_off_work,
- ab8500_thermal_power_off);
-
- ab8500_data->cfg.vcc = THERMAL_VCC;
- ab8500_data->cfg.r_up = PULL_UP_RESISTOR;
- ab8500_data->cfg.temp_tbl = ab8500_temp_tbl_a_thermistor;
- 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);
- }
-
- 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;
- data->ops.irq_handler = ab8500_temp_irq_handler;
- data->ops.show_name = ab8500_show_name;
- data->ops.show_label = ab8500_show_label;
- data->ops.is_visible = NULL;
-
- return 0;
-}
-EXPORT_SYMBOL(abx500_hwmon_init);
-
-MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@linaro.org>");
-MODULE_DESCRIPTION("AB8500 temperature driver");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-18 15:29:52 +0300