diff options
Diffstat (limited to 'drivers/hwmon/ab8500.c')
| -rw-r--r-- | drivers/hwmon/ab8500.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/drivers/hwmon/ab8500.c b/drivers/hwmon/ab8500.c deleted file mode 100644 index 8b6a4f4c8774..000000000000 --- a/drivers/hwmon/ab8500.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * Copyright (C) ST-Ericsson 2010 - 2013 - * Author: Martin Persson <martin.persson@stericsson.com> - * Hongbo Zhang <hongbo.zhang@linaro.org> - * License Terms: GNU General Public License v2 - * - * 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/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 "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 - -struct ab8500_gpadc_cfg { - const struct abx500_res_to_temp *temp_tbl; - int tbl_sz; - int vcc; - int r_up; -}; - -struct ab8500_temp { - struct ab8500_gpadc *gpadc; - 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 == BAT_CTRL) { - *temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp); - } else if (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; - - 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->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); - - 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; - - /* - * 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->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"); |