1 // SPDX-License-Identifier: GPL-2.0+
3 // Copyright (c) 2010-2024 Analog Devices Inc.
18 	[AD3552R_CH_OUTPUT_RANGE_NEG_5__5V]	= { -5000, 5000 },
19 	[AD3552R_CH_OUTPUT_RANGE_NEG_10__10V]	= { -10000, 10000 }
27 	[AD3542R_CH_OUTPUT_RANGE_NEG_5__5V]	= { -5000, 5000 },
28 	[AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V]	= { -2500, 7500 }
53 	s64 vref, tmp, common, offset, gn, gp;  in ad3552r_get_custom_range()  local
57 	 *	Vmax = 2.5 - [(GainP + Offset / 1024) * 2.5 * Rfb * 1.03]  in ad3552r_get_custom_range()
60 	vref = 2500;  in ad3552r_get_custom_range()
62 	common = 2575 * ch_data->rfb;  in ad3552r_get_custom_range()
63 	offset = ch_data->gain_offset;  in ad3552r_get_custom_range()
65 	gn = gains_scaling_table[ch_data->n];  in ad3552r_get_custom_range()
68 	*v_max = vref + tmp;  in ad3552r_get_custom_range()
70 	gp = gains_scaling_table[ch_data->p];  in ad3552r_get_custom_range()
71 	tmp = (1024 * gp - AD3552R_GAIN_SCALE * offset) * common;  in ad3552r_get_custom_range()
73 	*v_min = vref - tmp;  in ad3552r_get_custom_range()
82 	if (ch_data->range_override) {  in ad3552r_calc_gain_and_offset()
86 		idx = ch_data->range;  in ad3552r_calc_gain_and_offset()
87 		v_min = model_data->ranges_table[idx][0];  in ad3552r_calc_gain_and_offset()
88 		v_max = model_data->ranges_table[idx][1];  in ad3552r_calc_gain_and_offset()
101 	span = v_max - v_min;  in ad3552r_calc_gain_and_offset()
102 	ch_data->scale_int = div_s64_rem(span, 65536, &rem);  in ad3552r_calc_gain_and_offset()
104 	ch_data->scale_dec = DIV_ROUND_CLOSEST((s64)rem * 1000000, 65536);  in ad3552r_calc_gain_and_offset()
106 	ch_data->offset_int = div_s64_rem(v_min * 65536, span, &rem);  in ad3552r_calc_gain_and_offset()
108 	ch_data->offset_dec = div_s64(tmp, span);  in ad3552r_calc_gain_and_offset()
112 int ad3552r_get_ref_voltage(struct device *dev, u32 *val)  in ad3552r_get_ref_voltage()
114 	int voltage;  in ad3552r_get_ref_voltage()
115 	int delta = 100000;  in ad3552r_get_ref_voltage()
117 	voltage = devm_regulator_get_enable_read_voltage(dev, "vref");  in ad3552r_get_ref_voltage()
118 	if (voltage < 0 && voltage != -ENODEV)  in ad3552r_get_ref_voltage()
120 				     "Error getting vref voltage\n");  in ad3552r_get_ref_voltage()
122 	if (voltage == -ENODEV) {  in ad3552r_get_ref_voltage()
123 		if (device_property_read_bool(dev, "adi,vref-out-en"))  in ad3552r_get_ref_voltage()
131 	if (voltage > 2500000 + delta || voltage < 2500000 - delta) {  in ad3552r_get_ref_voltage()
132 		dev_warn(dev, "vref-supply must be 2.5V");  in ad3552r_get_ref_voltage()
133 		return -EINVAL;  in ad3552r_get_ref_voltage()
142 int ad3552r_get_drive_strength(struct device *dev, u32 *val)  in ad3552r_get_drive_strength()
144 	int err;  in ad3552r_get_drive_strength()
147 	err = device_property_read_u32(dev, "adi,sdo-drive-strength",  in ad3552r_get_drive_strength()
153 		dev_err_probe(dev, -EINVAL,  in ad3552r_get_drive_strength()
154 			      "adi,sdo-drive-strength must be less than 4\n");  in ad3552r_get_drive_strength()
155 		return -EINVAL;  in ad3552r_get_drive_strength()
164 int ad3552r_get_custom_gain(struct device *dev, struct fwnode_handle *child,  in ad3552r_get_custom_gain()
167 	int err;  in ad3552r_get_custom_gain()
171 					    "custom-output-range-config");  in ad3552r_get_custom_gain()
174 		return dev_err_probe(dev, -EINVAL,  in ad3552r_get_custom_gain()
175 				     "custom-output-range-config mandatory\n");  in ad3552r_get_custom_gain()
177 	err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-p", &val);  in ad3552r_get_custom_gain()
180 				     "adi,gain-scaling-p mandatory\n");  in ad3552r_get_custom_gain()
183 	err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-n", &val);  in ad3552r_get_custom_gain()
186 				     "adi,gain-scaling-n property mandatory\n");  in ad3552r_get_custom_gain()
189 	err = fwnode_property_read_u32(gain_child, "adi,rfb-ohms", &val);  in ad3552r_get_custom_gain()
192 				     "adi,rfb-ohms mandatory\n");  in ad3552r_get_custom_gain()
195 	err = fwnode_property_read_u32(gain_child, "adi,gain-offset", &val);  in ad3552r_get_custom_gain()
198 				     "adi,gain-offset mandatory\n");  in ad3552r_get_custom_gain()
205 static int ad3552r_find_range(const struct ad3552r_model_data *model_info,  in ad3552r_find_range()
208 	int i;  in ad3552r_find_range()
210 	for (i = 0; i < model_info->num_ranges; i++)  in ad3552r_find_range()
211 		if (vals[0] == model_info->ranges_table[i][0] * 1000 &&  in ad3552r_find_range()
212 		    vals[1] == model_info->ranges_table[i][1] * 1000)  in ad3552r_find_range()
215 	return -EINVAL;  in ad3552r_find_range()
218 int ad3552r_get_output_range(struct device *dev,  in ad3552r_get_output_range()
222 	int ret;  in ad3552r_get_output_range()
225 	/* This property is optional, so returning -ENOENT if missing */  in ad3552r_get_output_range()
226 	if (!fwnode_property_present(child, "adi,output-range-microvolt"))  in ad3552r_get_output_range()
227 		return -ENOENT;  in ad3552r_get_output_range()
230 					     "adi,output-range-microvolt",  in ad3552r_get_output_range()
234 				"invalid adi,output-range-microvolt\n");  in ad3552r_get_output_range()
239 			"invalid adi,output-range-microvolt value\n");  in ad3552r_get_output_range()