// SPDX-License-Identifier: GPL-2.0+ // // Copyright (c) 2010-2024 Analog Devices Inc. // Copyright (c) 2024 Baylibre, SAS #include #include #include #include #include #include "ad3552r.h" const s32 ad3552r_ch_ranges[AD3552R_MAX_RANGES][2] = { [AD3552R_CH_OUTPUT_RANGE_0__2P5V] = { 0, 2500 }, [AD3552R_CH_OUTPUT_RANGE_0__5V] = { 0, 5000 }, [AD3552R_CH_OUTPUT_RANGE_0__10V] = { 0, 10000 }, [AD3552R_CH_OUTPUT_RANGE_NEG_5__5V] = { -5000, 5000 }, [AD3552R_CH_OUTPUT_RANGE_NEG_10__10V] = { -10000, 10000 } }; EXPORT_SYMBOL_NS_GPL(ad3552r_ch_ranges, IIO_AD3552R); const s32 ad3542r_ch_ranges[AD3542R_MAX_RANGES][2] = { [AD3542R_CH_OUTPUT_RANGE_0__2P5V] = { 0, 2500 }, [AD3542R_CH_OUTPUT_RANGE_0__3V] = { 0, 3000 }, [AD3542R_CH_OUTPUT_RANGE_0__5V] = { 0, 5000 }, [AD3542R_CH_OUTPUT_RANGE_0__10V] = { 0, 10000 }, [AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V] = { -2500, 7500 }, [AD3542R_CH_OUTPUT_RANGE_NEG_5__5V] = { -5000, 5000 } }; EXPORT_SYMBOL_NS_GPL(ad3542r_ch_ranges, IIO_AD3552R); /* Gain * AD3552R_GAIN_SCALE */ static const s32 gains_scaling_table[] = { [AD3552R_CH_GAIN_SCALING_1] = 1000, [AD3552R_CH_GAIN_SCALING_0_5] = 500, [AD3552R_CH_GAIN_SCALING_0_25] = 250, [AD3552R_CH_GAIN_SCALING_0_125] = 125 }; u16 ad3552r_calc_custom_gain(u8 p, u8 n, s16 goffs) { return FIELD_PREP(AD3552R_MASK_CH_RANGE_OVERRIDE, 1) | FIELD_PREP(AD3552R_MASK_CH_GAIN_SCALING_P, p) | FIELD_PREP(AD3552R_MASK_CH_GAIN_SCALING_N, n) | FIELD_PREP(AD3552R_MASK_CH_OFFSET_BIT_8, abs(goffs)) | FIELD_PREP(AD3552R_MASK_CH_OFFSET_POLARITY, goffs < 0); } EXPORT_SYMBOL_NS_GPL(ad3552r_calc_custom_gain, IIO_AD3552R); static void ad3552r_get_custom_range(struct ad3552r_ch_data *ch_data, s32 *v_min, s32 *v_max) { s64 vref, tmp, common, offset, gn, gp; /* * From datasheet formula (In Volts): * Vmin = 2.5 + [(GainN + Offset / 1024) * 2.5 * Rfb * 1.03] * Vmax = 2.5 - [(GainP + Offset / 1024) * 2.5 * Rfb * 1.03] * Calculus are converted to milivolts */ vref = 2500; /* 2.5 * 1.03 * 1000 (To mV) */ common = 2575 * ch_data->rfb; offset = ch_data->gain_offset; gn = gains_scaling_table[ch_data->n]; tmp = (1024 * gn + AD3552R_GAIN_SCALE * offset) * common; tmp = div_s64(tmp, 1024 * AD3552R_GAIN_SCALE); *v_max = vref + tmp; gp = gains_scaling_table[ch_data->p]; tmp = (1024 * gp - AD3552R_GAIN_SCALE * offset) * common; tmp = div_s64(tmp, 1024 * AD3552R_GAIN_SCALE); *v_min = vref - tmp; } void ad3552r_calc_gain_and_offset(struct ad3552r_ch_data *ch_data, const struct ad3552r_model_data *model_data) { s32 idx, v_max, v_min, span, rem; s64 tmp; if (ch_data->range_override) { ad3552r_get_custom_range(ch_data, &v_min, &v_max); } else { /* Normal range */ idx = ch_data->range; v_min = model_data->ranges_table[idx][0]; v_max = model_data->ranges_table[idx][1]; } /* * From datasheet formula: * Vout = Span * (D / 65536) + Vmin * Converted to scale and offset: * Scale = Span / 65536 * Offset = 65536 * Vmin / Span * * Reminders are in micros in order to be printed as * IIO_VAL_INT_PLUS_MICRO */ span = v_max - v_min; ch_data->scale_int = div_s64_rem(span, 65536, &rem); /* Do operations in microvolts */ ch_data->scale_dec = DIV_ROUND_CLOSEST((s64)rem * 1000000, 65536); ch_data->offset_int = div_s64_rem(v_min * 65536, span, &rem); tmp = (s64)rem * 1000000; ch_data->offset_dec = div_s64(tmp, span); } EXPORT_SYMBOL_NS_GPL(ad3552r_calc_gain_and_offset, IIO_AD3552R); int ad3552r_get_ref_voltage(struct device *dev, u32 *val) { int voltage; int delta = 100000; voltage = devm_regulator_get_enable_read_voltage(dev, "vref"); if (voltage < 0 && voltage != -ENODEV) return dev_err_probe(dev, voltage, "Error getting vref voltage\n"); if (voltage == -ENODEV) { if (device_property_read_bool(dev, "adi,vref-out-en")) *val = AD3552R_INTERNAL_VREF_PIN_2P5V; else *val = AD3552R_INTERNAL_VREF_PIN_FLOATING; return 0; } if (voltage > 2500000 + delta || voltage < 2500000 - delta) { dev_warn(dev, "vref-supply must be 2.5V"); return -EINVAL; } *val = AD3552R_EXTERNAL_VREF_PIN_INPUT; return 0; } EXPORT_SYMBOL_NS_GPL(ad3552r_get_ref_voltage, IIO_AD3552R); int ad3552r_get_drive_strength(struct device *dev, u32 *val) { int err; u32 drive_strength; err = device_property_read_u32(dev, "adi,sdo-drive-strength", &drive_strength); if (err) return err; if (drive_strength > 3) { dev_err_probe(dev, -EINVAL, "adi,sdo-drive-strength must be less than 4\n"); return -EINVAL; } *val = drive_strength; return 0; } EXPORT_SYMBOL_NS_GPL(ad3552r_get_drive_strength, IIO_AD3552R); int ad3552r_get_custom_gain(struct device *dev, struct fwnode_handle *child, u8 *gs_p, u8 *gs_n, u16 *rfb, s16 *goffs) { int err; u32 val; struct fwnode_handle *gain_child __free(fwnode_handle) = fwnode_get_named_child_node(child, "custom-output-range-config"); if (!gain_child) return dev_err_probe(dev, -EINVAL, "custom-output-range-config mandatory\n"); err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-p", &val); if (err) return dev_err_probe(dev, err, "adi,gain-scaling-p mandatory\n"); *gs_p = val; err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-n", &val); if (err) return dev_err_probe(dev, err, "adi,gain-scaling-n property mandatory\n"); *gs_n = val; err = fwnode_property_read_u32(gain_child, "adi,rfb-ohms", &val); if (err) return dev_err_probe(dev, err, "adi,rfb-ohms mandatory\n"); *rfb = val; err = fwnode_property_read_u32(gain_child, "adi,gain-offset", &val); if (err) return dev_err_probe(dev, err, "adi,gain-offset mandatory\n"); *goffs = val; return 0; } EXPORT_SYMBOL_NS_GPL(ad3552r_get_custom_gain, IIO_AD3552R); static int ad3552r_find_range(const struct ad3552r_model_data *model_info, s32 *vals) { int i; for (i = 0; i < model_info->num_ranges; i++) if (vals[0] == model_info->ranges_table[i][0] * 1000 && vals[1] == model_info->ranges_table[i][1] * 1000) return i; return -EINVAL; } int ad3552r_get_output_range(struct device *dev, const struct ad3552r_model_data *model_info, struct fwnode_handle *child, u32 *val) { int ret; s32 vals[2]; /* This property is optional, so returning -ENOENT if missing */ if (!fwnode_property_present(child, "adi,output-range-microvolt")) return -ENOENT; ret = fwnode_property_read_u32_array(child, "adi,output-range-microvolt", vals, 2); if (ret) return dev_err_probe(dev, ret, "invalid adi,output-range-microvolt\n"); ret = ad3552r_find_range(model_info, vals); if (ret < 0) return dev_err_probe(dev, ret, "invalid adi,output-range-microvolt value\n"); *val = ret; return 0; } EXPORT_SYMBOL_NS_GPL(ad3552r_get_output_range, IIO_AD3552R); MODULE_DESCRIPTION("ad3552r common functions"); MODULE_LICENSE("GPL");