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224 lines
6.1 KiB
224 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson 2010 - 2013 |
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* Author: Martin Persson <[email protected]> |
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* Hongbo Zhang <[email protected]> |
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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/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 <linux/iio/consumer.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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#define AB8500_SENSOR_AUX1 0 |
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#define AB8500_SENSOR_AUX2 1 |
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#define AB8500_SENSOR_BTEMP_BALL 2 |
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#define AB8500_SENSOR_BAT_CTRL 3 |
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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 iio_channel *aux1; |
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struct iio_channel *aux2; |
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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 == AB8500_SENSOR_BTEMP_BALL) { |
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*temp = ab8500_btemp_get_temp(ab8500_data->btemp); |
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} else if (sensor == AB8500_SENSOR_BAT_CTRL) { |
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*temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp); |
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} else if (sensor == AB8500_SENSOR_AUX1) { |
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ret = iio_read_channel_processed(ab8500_data->aux1, &voltage); |
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if (ret < 0) |
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return ret; |
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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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} else if (sensor == AB8500_SENSOR_AUX2) { |
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ret = iio_read_channel_processed(ab8500_data->aux2, &voltage); |
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if (ret < 0) |
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return ret; |
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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->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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ab8500_data->aux1 = devm_iio_channel_get(&data->pdev->dev, "aux1"); |
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if (IS_ERR(ab8500_data->aux1)) { |
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if (PTR_ERR(ab8500_data->aux1) == -ENODEV) |
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return -EPROBE_DEFER; |
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dev_err(&data->pdev->dev, "failed to get AUX1 ADC channel\n"); |
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return PTR_ERR(ab8500_data->aux1); |
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} |
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ab8500_data->aux2 = devm_iio_channel_get(&data->pdev->dev, "aux2"); |
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if (IS_ERR(ab8500_data->aux2)) { |
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if (PTR_ERR(ab8500_data->aux2) == -ENODEV) |
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return -EPROBE_DEFER; |
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dev_err(&data->pdev->dev, "failed to get AUX2 ADC channel\n"); |
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return PTR_ERR(ab8500_data->aux2); |
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} |
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data->gpadc_addr[0] = AB8500_SENSOR_AUX1; |
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data->gpadc_addr[1] = AB8500_SENSOR_AUX2; |
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data->gpadc_addr[2] = AB8500_SENSOR_BTEMP_BALL; |
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data->gpadc_addr[3] = AB8500_SENSOR_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 <[email protected]>"); |
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MODULE_DESCRIPTION("AB8500 temperature driver"); |
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MODULE_LICENSE("GPL");
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