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Drivers should not call pm_power_off directly; it is not guaranteed to be non-NULL. Call kernel_power_off instead. Cc: Jean Delvare <jdelvare@suse.de> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
207 lines
5.4 KiB
C
207 lines
5.4 KiB
C
/*
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* Copyright (C) ST-Ericsson 2010 - 2013
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* Author: Martin Persson <martin.persson@stericsson.com>
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* Hongbo Zhang <hongbo.zhang@linaro.org>
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* License Terms: GNU General Public License v2
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*
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* When the AB8500 thermal warning temperature is reached (threshold cannot
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* be changed by SW), an interrupt is set, and if no further action is taken
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* within a certain time frame, kernel_power_off will be called.
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*
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* When AB8500 thermal shutdown temperature is reached a hardware shutdown of
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* the AB8500 will occur.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/abx500/ab8500-bm.h>
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#include <linux/mfd/abx500/ab8500-gpadc.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power/ab8500.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include "abx500.h"
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#define DEFAULT_POWER_OFF_DELAY (HZ * 10)
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#define THERMAL_VCC 1800
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#define PULL_UP_RESISTOR 47000
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/* Number of monitored sensors should not greater than NUM_SENSORS */
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#define NUM_MONITORED_SENSORS 4
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struct ab8500_gpadc_cfg {
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const struct abx500_res_to_temp *temp_tbl;
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int tbl_sz;
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int vcc;
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int r_up;
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};
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struct ab8500_temp {
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struct ab8500_gpadc *gpadc;
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struct ab8500_btemp *btemp;
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struct delayed_work power_off_work;
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struct ab8500_gpadc_cfg cfg;
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struct abx500_temp *abx500_data;
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};
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/*
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* The hardware connection is like this:
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* VCC----[ R_up ]-----[ NTC ]----GND
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* where R_up is pull-up resistance, and GPADC measures voltage on NTC.
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* and res_to_temp table is strictly sorted by falling resistance values.
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*/
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static int ab8500_voltage_to_temp(struct ab8500_gpadc_cfg *cfg,
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int v_ntc, int *temp)
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{
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int r_ntc, i = 0, tbl_sz = cfg->tbl_sz;
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const struct abx500_res_to_temp *tbl = cfg->temp_tbl;
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if (cfg->vcc < 0 || v_ntc >= cfg->vcc)
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return -EINVAL;
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r_ntc = v_ntc * cfg->r_up / (cfg->vcc - v_ntc);
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if (r_ntc > tbl[0].resist || r_ntc < tbl[tbl_sz - 1].resist)
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return -EINVAL;
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while (!(r_ntc <= tbl[i].resist && r_ntc > tbl[i + 1].resist) &&
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i < tbl_sz - 2)
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i++;
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/* return milli-Celsius */
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*temp = tbl[i].temp * 1000 + ((tbl[i + 1].temp - tbl[i].temp) * 1000 *
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(r_ntc - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
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return 0;
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}
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static int ab8500_read_sensor(struct abx500_temp *data, u8 sensor, int *temp)
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{
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int voltage, ret;
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struct ab8500_temp *ab8500_data = data->plat_data;
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if (sensor == BAT_CTRL) {
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*temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp);
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} else if (sensor == BTEMP_BALL) {
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*temp = ab8500_btemp_get_temp(ab8500_data->btemp);
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} else {
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voltage = ab8500_gpadc_convert(ab8500_data->gpadc, sensor);
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if (voltage < 0)
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return voltage;
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ret = ab8500_voltage_to_temp(&ab8500_data->cfg, voltage, temp);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static void ab8500_thermal_power_off(struct work_struct *work)
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{
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struct ab8500_temp *ab8500_data = container_of(work,
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struct ab8500_temp, power_off_work.work);
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struct abx500_temp *abx500_data = ab8500_data->abx500_data;
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dev_warn(&abx500_data->pdev->dev, "Power off due to critical temp\n");
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kernel_power_off();
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}
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static ssize_t ab8500_show_name(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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return sprintf(buf, "ab8500\n");
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}
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static ssize_t ab8500_show_label(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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char *label;
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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int index = attr->index;
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switch (index) {
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case 1:
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label = "ext_adc1";
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break;
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case 2:
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label = "ext_adc2";
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break;
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case 3:
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label = "bat_temp";
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break;
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case 4:
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label = "bat_ctrl";
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break;
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default:
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return -EINVAL;
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}
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return sprintf(buf, "%s\n", label);
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}
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static int ab8500_temp_irq_handler(int irq, struct abx500_temp *data)
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{
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struct ab8500_temp *ab8500_data = data->plat_data;
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dev_warn(&data->pdev->dev, "Power off in %d s\n",
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DEFAULT_POWER_OFF_DELAY / HZ);
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schedule_delayed_work(&ab8500_data->power_off_work,
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DEFAULT_POWER_OFF_DELAY);
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return 0;
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}
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int abx500_hwmon_init(struct abx500_temp *data)
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{
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struct ab8500_temp *ab8500_data;
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ab8500_data = devm_kzalloc(&data->pdev->dev, sizeof(*ab8500_data),
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GFP_KERNEL);
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if (!ab8500_data)
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return -ENOMEM;
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ab8500_data->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
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if (IS_ERR(ab8500_data->gpadc))
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return PTR_ERR(ab8500_data->gpadc);
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ab8500_data->btemp = ab8500_btemp_get();
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if (IS_ERR(ab8500_data->btemp))
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return PTR_ERR(ab8500_data->btemp);
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INIT_DELAYED_WORK(&ab8500_data->power_off_work,
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ab8500_thermal_power_off);
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ab8500_data->cfg.vcc = THERMAL_VCC;
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ab8500_data->cfg.r_up = PULL_UP_RESISTOR;
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ab8500_data->cfg.temp_tbl = ab8500_temp_tbl_a_thermistor;
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ab8500_data->cfg.tbl_sz = ab8500_temp_tbl_a_size;
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data->plat_data = ab8500_data;
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/*
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* ADC_AUX1 and ADC_AUX2, connected to external NTC
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* BTEMP_BALL and BAT_CTRL, fixed usage
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*/
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data->gpadc_addr[0] = ADC_AUX1;
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data->gpadc_addr[1] = ADC_AUX2;
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data->gpadc_addr[2] = BTEMP_BALL;
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data->gpadc_addr[3] = BAT_CTRL;
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data->monitored_sensors = NUM_MONITORED_SENSORS;
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data->ops.read_sensor = ab8500_read_sensor;
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data->ops.irq_handler = ab8500_temp_irq_handler;
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data->ops.show_name = ab8500_show_name;
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data->ops.show_label = ab8500_show_label;
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data->ops.is_visible = NULL;
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return 0;
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}
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EXPORT_SYMBOL(abx500_hwmon_init);
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MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@linaro.org>");
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MODULE_DESCRIPTION("AB8500 temperature driver");
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MODULE_LICENSE("GPL");
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