1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2010-2024 Analog Devices Inc.
// Copyright (c) 2024 Baylibre, SAS
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#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");
|
