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507 lines
14 KiB
507 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* HWMON Driver for Dialog DA9052 |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: David Dajun Chen <[email protected]> |
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*/ |
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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/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/property.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#include <linux/mfd/da9052/reg.h> |
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#include <linux/regulator/consumer.h> |
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struct da9052_hwmon { |
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struct da9052 *da9052; |
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struct mutex hwmon_lock; |
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bool tsi_as_adc; |
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int tsiref_mv; |
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struct regulator *tsiref; |
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struct completion tsidone; |
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}; |
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static const char * const input_names[] = { |
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[DA9052_ADC_VDDOUT] = "VDDOUT", |
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[DA9052_ADC_ICH] = "CHARGING CURRENT", |
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[DA9052_ADC_TBAT] = "BATTERY TEMP", |
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[DA9052_ADC_VBAT] = "BATTERY VOLTAGE", |
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[DA9052_ADC_IN4] = "ADC IN4", |
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[DA9052_ADC_IN5] = "ADC IN5", |
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[DA9052_ADC_IN6] = "ADC IN6", |
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[DA9052_ADC_TSI_XP] = "ADC TS X+", |
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[DA9052_ADC_TSI_YP] = "ADC TS Y+", |
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[DA9052_ADC_TSI_XN] = "ADC TS X-", |
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[DA9052_ADC_TSI_YN] = "ADC TS Y-", |
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[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", |
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[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", |
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}; |
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/* Conversion function for VDDOUT and VBAT */ |
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static inline int volt_reg_to_mv(int value) |
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{ |
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return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500; |
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} |
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/* Conversion function for ADC channels 4, 5 and 6 */ |
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static inline int input_reg_to_mv(int value) |
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{ |
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return DIV_ROUND_CLOSEST(value * 2500, 1023); |
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} |
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/* Conversion function for VBBAT */ |
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static inline int vbbat_reg_to_mv(int value) |
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{ |
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return DIV_ROUND_CLOSEST(value * 5000, 1023); |
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} |
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static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value) |
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{ |
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return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023); |
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} |
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static inline int da9052_enable_vddout_channel(struct da9052 *da9052) |
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{ |
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return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, |
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DA9052_ADCCONT_AUTOVDDEN, |
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DA9052_ADCCONT_AUTOVDDEN); |
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} |
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static inline int da9052_disable_vddout_channel(struct da9052 *da9052) |
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{ |
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return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, |
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DA9052_ADCCONT_AUTOVDDEN, 0); |
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} |
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static ssize_t da9052_vddout_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int ret, vdd; |
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mutex_lock(&hwmon->hwmon_lock); |
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ret = da9052_enable_vddout_channel(hwmon->da9052); |
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if (ret < 0) |
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goto hwmon_err; |
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vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); |
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if (vdd < 0) { |
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ret = vdd; |
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goto hwmon_err_release; |
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} |
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ret = da9052_disable_vddout_channel(hwmon->da9052); |
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if (ret < 0) |
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goto hwmon_err; |
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mutex_unlock(&hwmon->hwmon_lock); |
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return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); |
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hwmon_err_release: |
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da9052_disable_vddout_channel(hwmon->da9052); |
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hwmon_err: |
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mutex_unlock(&hwmon->hwmon_lock); |
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return ret; |
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} |
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static ssize_t da9052_ich_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int ret; |
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ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); |
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if (ret < 0) |
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return ret; |
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/* Equivalent to 3.9mA/bit in register ICHG_AV */ |
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return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); |
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} |
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static ssize_t da9052_tbat_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); |
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} |
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static ssize_t da9052_vbat_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int ret; |
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ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); |
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} |
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static ssize_t da9052_misc_channel_show(struct device *dev, |
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struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int channel = to_sensor_dev_attr(devattr)->index; |
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int ret; |
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ret = da9052_adc_manual_read(hwmon->da9052, channel); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", input_reg_to_mv(ret)); |
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} |
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static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel) |
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{ |
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u8 val = DA9052_TSICONTB_TSIMAN; |
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switch (channel) { |
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case DA9052_ADC_TSI_XP: |
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val |= DA9052_TSICONTB_TSIMUX_XP; |
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break; |
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case DA9052_ADC_TSI_YP: |
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val |= DA9052_TSICONTB_TSIMUX_YP; |
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break; |
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case DA9052_ADC_TSI_XN: |
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val |= DA9052_TSICONTB_TSIMUX_XN; |
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break; |
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case DA9052_ADC_TSI_YN: |
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val |= DA9052_TSICONTB_TSIMUX_YN; |
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break; |
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} |
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return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val); |
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} |
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static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel) |
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{ |
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u8 regs[3]; |
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int msb, lsb, err; |
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/* block read to avoid separation of MSB and LSB */ |
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err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG, |
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ARRAY_SIZE(regs), regs); |
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if (err) |
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return err; |
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switch (channel) { |
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case DA9052_ADC_TSI_XP: |
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case DA9052_ADC_TSI_XN: |
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msb = regs[0] << DA9052_TSILSB_TSIXL_BITS; |
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lsb = regs[2] & DA9052_TSILSB_TSIXL; |
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lsb >>= DA9052_TSILSB_TSIXL_SHIFT; |
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break; |
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case DA9052_ADC_TSI_YP: |
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case DA9052_ADC_TSI_YN: |
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msb = regs[1] << DA9052_TSILSB_TSIYL_BITS; |
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lsb = regs[2] & DA9052_TSILSB_TSIYL; |
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lsb >>= DA9052_TSILSB_TSIYL_SHIFT; |
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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 msb | lsb; |
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} |
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static ssize_t __da9052_read_tsi(struct device *dev, int channel) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int ret; |
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reinit_completion(&hwmon->tsidone); |
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ret = da9052_request_tsi_read(hwmon, channel); |
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if (ret < 0) |
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return ret; |
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/* Wait for an conversion done interrupt */ |
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if (!wait_for_completion_timeout(&hwmon->tsidone, |
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msecs_to_jiffies(500))) |
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return -ETIMEDOUT; |
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return da9052_get_tsi_result(hwmon, channel); |
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} |
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static ssize_t da9052_tsi_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int channel = to_sensor_dev_attr(devattr)->index; |
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int ret; |
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mutex_lock(&hwmon->da9052->auxadc_lock); |
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ret = __da9052_read_tsi(dev, channel); |
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mutex_unlock(&hwmon->da9052->auxadc_lock); |
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if (ret < 0) |
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return ret; |
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else |
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return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret)); |
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} |
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static ssize_t da9052_tjunc_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int tjunc; |
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int toffset; |
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tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); |
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if (tjunc < 0) |
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return tjunc; |
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toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); |
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if (toffset < 0) |
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return toffset; |
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/* |
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* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 |
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* T_OFFSET is a trim value used to improve accuracy of the result |
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*/ |
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return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); |
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} |
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static ssize_t da9052_vbbat_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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int ret; |
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ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); |
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} |
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static ssize_t label_show(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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return sprintf(buf, "%s\n", |
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input_names[to_sensor_dev_attr(devattr)->index]); |
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} |
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static umode_t da9052_channel_is_visible(struct kobject *kobj, |
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struct attribute *attr, int index) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct da9052_hwmon *hwmon = dev_get_drvdata(dev); |
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struct device_attribute *dattr = container_of(attr, |
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struct device_attribute, attr); |
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struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); |
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if (!hwmon->tsi_as_adc) { |
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switch (sattr->index) { |
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case DA9052_ADC_TSI_XP: |
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case DA9052_ADC_TSI_YP: |
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case DA9052_ADC_TSI_XN: |
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case DA9052_ADC_TSI_YN: |
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return 0; |
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} |
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} |
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return attr->mode; |
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} |
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static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT); |
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static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT); |
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static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT); |
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static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT); |
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static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4); |
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static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4); |
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static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5); |
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static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5); |
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static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6); |
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static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6); |
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static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT); |
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static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT); |
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static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP); |
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static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP); |
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static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN); |
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static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN); |
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static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP); |
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static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP); |
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static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN); |
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static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN); |
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static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH); |
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static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT); |
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static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT); |
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static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC); |
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static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC); |
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static struct attribute *da9052_attrs[] = { |
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&sensor_dev_attr_in0_input.dev_attr.attr, |
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&sensor_dev_attr_in0_label.dev_attr.attr, |
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&sensor_dev_attr_in3_input.dev_attr.attr, |
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&sensor_dev_attr_in3_label.dev_attr.attr, |
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&sensor_dev_attr_in4_input.dev_attr.attr, |
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&sensor_dev_attr_in4_label.dev_attr.attr, |
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&sensor_dev_attr_in5_input.dev_attr.attr, |
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&sensor_dev_attr_in5_label.dev_attr.attr, |
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&sensor_dev_attr_in6_input.dev_attr.attr, |
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&sensor_dev_attr_in6_label.dev_attr.attr, |
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&sensor_dev_attr_in70_input.dev_attr.attr, |
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&sensor_dev_attr_in70_label.dev_attr.attr, |
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&sensor_dev_attr_in71_input.dev_attr.attr, |
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&sensor_dev_attr_in71_label.dev_attr.attr, |
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&sensor_dev_attr_in72_input.dev_attr.attr, |
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&sensor_dev_attr_in72_label.dev_attr.attr, |
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&sensor_dev_attr_in73_input.dev_attr.attr, |
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&sensor_dev_attr_in73_label.dev_attr.attr, |
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&sensor_dev_attr_in9_input.dev_attr.attr, |
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&sensor_dev_attr_in9_label.dev_attr.attr, |
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&sensor_dev_attr_curr1_input.dev_attr.attr, |
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&sensor_dev_attr_curr1_label.dev_attr.attr, |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_label.dev_attr.attr, |
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&sensor_dev_attr_temp8_input.dev_attr.attr, |
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&sensor_dev_attr_temp8_label.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group da9052_group = { |
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.attrs = da9052_attrs, |
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.is_visible = da9052_channel_is_visible, |
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}; |
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__ATTRIBUTE_GROUPS(da9052); |
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static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data) |
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{ |
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struct da9052_hwmon *hwmon = data; |
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complete(&hwmon->tsidone); |
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return IRQ_HANDLED; |
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} |
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static int da9052_hwmon_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct da9052_hwmon *hwmon; |
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struct device *hwmon_dev; |
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int err; |
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hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); |
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if (!hwmon) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, hwmon); |
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mutex_init(&hwmon->hwmon_lock); |
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hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); |
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init_completion(&hwmon->tsidone); |
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hwmon->tsi_as_adc = |
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device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc"); |
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if (hwmon->tsi_as_adc) { |
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hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); |
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if (IS_ERR(hwmon->tsiref)) { |
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err = PTR_ERR(hwmon->tsiref); |
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dev_err(&pdev->dev, "failed to get tsiref: %d", err); |
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return err; |
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} |
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err = regulator_enable(hwmon->tsiref); |
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if (err) |
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return err; |
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hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); |
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if (hwmon->tsiref_mv < 0) { |
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err = hwmon->tsiref_mv; |
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goto exit_regulator; |
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} |
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|
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/* convert from microvolt (DT) to millivolt (hwmon) */ |
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hwmon->tsiref_mv /= 1000; |
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|
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/* TSIREF limits from datasheet */ |
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if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { |
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dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", |
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hwmon->tsiref_mv); |
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err = -ENXIO; |
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goto exit_regulator; |
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} |
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/* disable touchscreen features */ |
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da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00); |
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|
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/* Sample every 1ms */ |
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da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG, |
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DA9052_ADCCONT_ADCMODE, |
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DA9052_ADCCONT_ADCMODE); |
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err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, |
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"tsiready-irq", da9052_tsi_datardy_irq, |
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hwmon); |
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if (err) { |
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dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d", |
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err); |
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goto exit_regulator; |
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} |
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} |
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", |
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hwmon, |
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da9052_groups); |
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err = PTR_ERR_OR_ZERO(hwmon_dev); |
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if (err) |
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goto exit_irq; |
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return 0; |
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exit_irq: |
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if (hwmon->tsi_as_adc) |
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da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); |
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exit_regulator: |
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if (hwmon->tsiref) |
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regulator_disable(hwmon->tsiref); |
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|
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return err; |
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} |
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|
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static int da9052_hwmon_remove(struct platform_device *pdev) |
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{ |
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struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); |
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|
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if (hwmon->tsi_as_adc) { |
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da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); |
|
regulator_disable(hwmon->tsiref); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver da9052_hwmon_driver = { |
|
.probe = da9052_hwmon_probe, |
|
.remove = da9052_hwmon_remove, |
|
.driver = { |
|
.name = "da9052-hwmon", |
|
}, |
|
}; |
|
|
|
module_platform_driver(da9052_hwmon_driver); |
|
|
|
MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
|
MODULE_DESCRIPTION("DA9052 HWMON driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:da9052-hwmon");
|
|
|