diff options
Diffstat (limited to 'drivers/hwmon/da9052-hwmon.c')
| -rw-r--r-- | drivers/hwmon/da9052-hwmon.c | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c new file mode 100644 index 000000000..ed6c5df94 --- /dev/null +++ b/drivers/hwmon/da9052-hwmon.c @@ -0,0 +1,507 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HWMON Driver for Dialog DA9052 + * + * Copyright(c) 2012 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen <dchen@diasemi.com> + */ + +#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> +#include <linux/property.h> + +#include <linux/mfd/da9052/da9052.h> +#include <linux/mfd/da9052/reg.h> +#include <linux/regulator/consumer.h> + +struct da9052_hwmon { + struct da9052 *da9052; + struct mutex hwmon_lock; + bool tsi_as_adc; + int tsiref_mv; + struct regulator *tsiref; + struct completion tsidone; +}; + +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", + [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-", + [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", + [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", +}; + +/* Conversion function for VDDOUT and VBAT */ +static inline int volt_reg_to_mv(int value) +{ + return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500; +} + +/* Conversion function for ADC channels 4, 5 and 6 */ +static inline int input_reg_to_mv(int value) +{ + return DIV_ROUND_CLOSEST(value * 2500, 1023); +} + +/* Conversion function for VBBAT */ +static inline int vbbat_reg_to_mv(int value) +{ + return DIV_ROUND_CLOSEST(value * 5000, 1023); +} + +static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value) +{ + return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023); +} + +static inline int da9052_enable_vddout_channel(struct da9052 *da9052) +{ + return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, + DA9052_ADCCONT_AUTOVDDEN, + DA9052_ADCCONT_AUTOVDDEN); +} + +static inline int da9052_disable_vddout_channel(struct da9052 *da9052) +{ + return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, + DA9052_ADCCONT_AUTOVDDEN, 0); +} + +static ssize_t da9052_vddout_show(struct device *dev, + 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); + return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); + +hwmon_err_release: + da9052_disable_vddout_channel(hwmon->da9052); +hwmon_err: + mutex_unlock(&hwmon->hwmon_lock); + return ret; +} + +static ssize_t da9052_ich_show(struct device *dev, + 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\n", DIV_ROUND_CLOSEST(ret * 39, 10)); +} + +static ssize_t da9052_tbat_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); +} + +static ssize_t da9052_vbat_show(struct device *dev, + 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; + + return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); +} + +static ssize_t da9052_misc_channel_show(struct device *dev, + 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; + + return sprintf(buf, "%d\n", input_reg_to_mv(ret)); +} + +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); +} + +static ssize_t da9052_tsi_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); + int channel = to_sensor_dev_attr(devattr)->index; + int ret; + + mutex_lock(&hwmon->da9052->auxadc_lock); + ret = __da9052_read_tsi(dev, channel); + mutex_unlock(&hwmon->da9052->auxadc_lock); + + if (ret < 0) + return ret; + else + return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret)); +} + +static ssize_t da9052_tjunc_show(struct device *dev, + 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\n", 1708 * (tjunc - toffset) - 108800); +} + +static ssize_t da9052_vbbat_show(struct device *dev, + 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; + + return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); +} + +static ssize_t label_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + return sprintf(buf, "%s\n", + input_names[to_sensor_dev_attr(devattr)->index]); +} + +static umode_t da9052_channel_is_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = kobj_to_dev(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; +} + +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); + +static struct attribute *da9052_attrs[] = { + &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, + &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, + &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 +}; + +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; +} + +static int da9052_hwmon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct da9052_hwmon *hwmon; + struct device *hwmon_dev; + int err; + + hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); + if (!hwmon) + return -ENOMEM; + + platform_set_drvdata(pdev, hwmon); + + mutex_init(&hwmon->hwmon_lock); + hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); + + 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); + + /* Sample every 1ms */ + da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG, + DA9052_ADCCONT_ADCMODE, + DA9052_ADCCONT_ADCMODE); + + 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; + } + } + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", + hwmon, + da9052_groups); + 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; +} + +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 <dchen@diasemi.com>"); +MODULE_DESCRIPTION("DA9052 HWMON driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-hwmon"); |