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