1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer
4 *
5 * Copyright 2010 Analog Devices Inc.
6 */
7
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/spi/spi.h>
12
13 #include <linux/iio/iio.h>
14 #include <linux/iio/imu/adis.h>
15
16 #define ADIS16201_STARTUP_DELAY_MS 220
17 #define ADIS16201_FLASH_CNT 0x00
18
19 /* Data Output Register Information */
20 #define ADIS16201_SUPPLY_OUT_REG 0x02
21 #define ADIS16201_XACCL_OUT_REG 0x04
22 #define ADIS16201_YACCL_OUT_REG 0x06
23 #define ADIS16201_AUX_ADC_REG 0x08
24 #define ADIS16201_TEMP_OUT_REG 0x0A
25 #define ADIS16201_XINCL_OUT_REG 0x0C
26 #define ADIS16201_YINCL_OUT_REG 0x0E
27
28 /* Calibration Register Definition */
29 #define ADIS16201_XACCL_OFFS_REG 0x10
30 #define ADIS16201_YACCL_OFFS_REG 0x12
31 #define ADIS16201_XACCL_SCALE_REG 0x14
32 #define ADIS16201_YACCL_SCALE_REG 0x16
33 #define ADIS16201_XINCL_OFFS_REG 0x18
34 #define ADIS16201_YINCL_OFFS_REG 0x1A
35 #define ADIS16201_XINCL_SCALE_REG 0x1C
36 #define ADIS16201_YINCL_SCALE_REG 0x1E
37
38 /* Alarm Register Definition */
39 #define ADIS16201_ALM_MAG1_REG 0x20
40 #define ADIS16201_ALM_MAG2_REG 0x22
41 #define ADIS16201_ALM_SMPL1_REG 0x24
42 #define ADIS16201_ALM_SMPL2_REG 0x26
43 #define ADIS16201_ALM_CTRL_REG 0x28
44
45 #define ADIS16201_AUX_DAC_REG 0x30
46 #define ADIS16201_GPIO_CTRL_REG 0x32
47 #define ADIS16201_SMPL_PRD_REG 0x36
48 /* Operation, filter configuration */
49 #define ADIS16201_AVG_CNT_REG 0x38
50 #define ADIS16201_SLP_CNT_REG 0x3A
51
52 /* Miscellaneous Control Register Definition */
53 #define ADIS16201_MSC_CTRL_REG 0x34
54 #define ADIS16201_MSC_CTRL_SELF_TEST_EN BIT(8)
55 /* Data-ready enable: 1 = enabled, 0 = disabled */
56 #define ADIS16201_MSC_CTRL_DATA_RDY_EN BIT(2)
57 /* Data-ready polarity: 1 = active high, 0 = active low */
58 #define ADIS16201_MSC_CTRL_ACTIVE_DATA_RDY_HIGH BIT(1)
59 /* Data-ready line selection: 1 = DIO1, 0 = DIO0 */
60 #define ADIS16201_MSC_CTRL_DATA_RDY_DIO1 BIT(0)
61
62 /* Diagnostics System Status Register Definition */
63 #define ADIS16201_DIAG_STAT_REG 0x3C
64 #define ADIS16201_DIAG_STAT_ALARM2 BIT(9)
65 #define ADIS16201_DIAG_STAT_ALARM1 BIT(8)
66 #define ADIS16201_DIAG_STAT_SPI_FAIL_BIT 3
67 #define ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT 2
68 /* Power supply above 3.625 V */
69 #define ADIS16201_DIAG_STAT_POWER_HIGH_BIT 1
70 /* Power supply below 2.975 V */
71 #define ADIS16201_DIAG_STAT_POWER_LOW_BIT 0
72
73 /* System Command Register Definition */
74 #define ADIS16201_GLOB_CMD_REG 0x3E
75 #define ADIS16201_GLOB_CMD_SW_RESET BIT(7)
76 #define ADIS16201_GLOB_CMD_FACTORY_RESET BIT(1)
77
78 #define ADIS16201_ERROR_ACTIVE BIT(14)
79
80 enum adis16201_scan {
81 ADIS16201_SCAN_ACC_X,
82 ADIS16201_SCAN_ACC_Y,
83 ADIS16201_SCAN_INCLI_X,
84 ADIS16201_SCAN_INCLI_Y,
85 ADIS16201_SCAN_SUPPLY,
86 ADIS16201_SCAN_AUX_ADC,
87 ADIS16201_SCAN_TEMP,
88 };
89
90 static const u8 adis16201_addresses[] = {
91 [ADIS16201_SCAN_ACC_X] = ADIS16201_XACCL_OFFS_REG,
92 [ADIS16201_SCAN_ACC_Y] = ADIS16201_YACCL_OFFS_REG,
93 [ADIS16201_SCAN_INCLI_X] = ADIS16201_XINCL_OFFS_REG,
94 [ADIS16201_SCAN_INCLI_Y] = ADIS16201_YINCL_OFFS_REG,
95 };
96
adis16201_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)97 static int adis16201_read_raw(struct iio_dev *indio_dev,
98 struct iio_chan_spec const *chan,
99 int *val, int *val2,
100 long mask)
101 {
102 struct adis *st = iio_priv(indio_dev);
103 int ret;
104 int bits;
105 u8 addr;
106 s16 val16;
107
108 switch (mask) {
109 case IIO_CHAN_INFO_RAW:
110 return adis_single_conversion(indio_dev, chan,
111 ADIS16201_ERROR_ACTIVE, val);
112 case IIO_CHAN_INFO_SCALE:
113 switch (chan->type) {
114 case IIO_VOLTAGE:
115 if (chan->channel == 0) {
116 /* Voltage base units are mV hence 1.22 mV */
117 *val = 1;
118 *val2 = 220000;
119 } else {
120 /* Voltage base units are mV hence 0.61 mV */
121 *val = 0;
122 *val2 = 610000;
123 }
124 return IIO_VAL_INT_PLUS_MICRO;
125 case IIO_TEMP:
126 *val = -470;
127 *val2 = 0;
128 return IIO_VAL_INT_PLUS_MICRO;
129 case IIO_ACCEL:
130 /*
131 * IIO base unit for sensitivity of accelerometer
132 * is milli g.
133 * 1 LSB represents 0.244 mg.
134 */
135 *val = 0;
136 *val2 = IIO_G_TO_M_S_2(462400);
137 return IIO_VAL_INT_PLUS_NANO;
138 case IIO_INCLI:
139 *val = 0;
140 *val2 = 100000;
141 return IIO_VAL_INT_PLUS_MICRO;
142 default:
143 return -EINVAL;
144 }
145 break;
146 case IIO_CHAN_INFO_OFFSET:
147 /*
148 * The raw ADC value is 1278 when the temperature
149 * is 25 degrees and the scale factor per milli
150 * degree celcius is -470.
151 */
152 *val = 25000 / -470 - 1278;
153 return IIO_VAL_INT;
154 case IIO_CHAN_INFO_CALIBBIAS:
155 switch (chan->type) {
156 case IIO_ACCEL:
157 bits = 12;
158 break;
159 case IIO_INCLI:
160 bits = 9;
161 break;
162 default:
163 return -EINVAL;
164 }
165 addr = adis16201_addresses[chan->scan_index];
166 ret = adis_read_reg_16(st, addr, &val16);
167 if (ret)
168 return ret;
169
170 *val = sign_extend32(val16, bits - 1);
171 return IIO_VAL_INT;
172 }
173
174 return -EINVAL;
175 }
176
adis16201_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)177 static int adis16201_write_raw(struct iio_dev *indio_dev,
178 struct iio_chan_spec const *chan,
179 int val,
180 int val2,
181 long mask)
182 {
183 struct adis *st = iio_priv(indio_dev);
184 int m;
185
186 if (mask != IIO_CHAN_INFO_CALIBBIAS)
187 return -EINVAL;
188
189 switch (chan->type) {
190 case IIO_ACCEL:
191 m = GENMASK(11, 0);
192 break;
193 case IIO_INCLI:
194 m = GENMASK(8, 0);
195 break;
196 default:
197 return -EINVAL;
198 }
199
200 return adis_write_reg_16(st, adis16201_addresses[chan->scan_index],
201 val & m);
202 }
203
204 static const struct iio_chan_spec adis16201_channels[] = {
205 ADIS_SUPPLY_CHAN(ADIS16201_SUPPLY_OUT_REG, ADIS16201_SCAN_SUPPLY, 0,
206 12),
207 ADIS_TEMP_CHAN(ADIS16201_TEMP_OUT_REG, ADIS16201_SCAN_TEMP, 0, 12),
208 ADIS_ACCEL_CHAN(X, ADIS16201_XACCL_OUT_REG, ADIS16201_SCAN_ACC_X,
209 BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
210 ADIS_ACCEL_CHAN(Y, ADIS16201_YACCL_OUT_REG, ADIS16201_SCAN_ACC_Y,
211 BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
212 ADIS_AUX_ADC_CHAN(ADIS16201_AUX_ADC_REG, ADIS16201_SCAN_AUX_ADC, 0, 12),
213 ADIS_INCLI_CHAN(X, ADIS16201_XINCL_OUT_REG, ADIS16201_SCAN_INCLI_X,
214 BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
215 ADIS_INCLI_CHAN(Y, ADIS16201_YINCL_OUT_REG, ADIS16201_SCAN_INCLI_Y,
216 BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
217 IIO_CHAN_SOFT_TIMESTAMP(7)
218 };
219
220 static const struct iio_info adis16201_info = {
221 .read_raw = adis16201_read_raw,
222 .write_raw = adis16201_write_raw,
223 .update_scan_mode = adis_update_scan_mode,
224 };
225
226 static const char * const adis16201_status_error_msgs[] = {
227 [ADIS16201_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
228 [ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT] = "Flash update failed",
229 [ADIS16201_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
230 [ADIS16201_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.975V",
231 };
232
233 static const struct adis_timeout adis16201_timeouts = {
234 .reset_ms = ADIS16201_STARTUP_DELAY_MS,
235 .sw_reset_ms = ADIS16201_STARTUP_DELAY_MS,
236 .self_test_ms = ADIS16201_STARTUP_DELAY_MS,
237 };
238
239 static const struct adis_data adis16201_data = {
240 .read_delay = 20,
241 .msc_ctrl_reg = ADIS16201_MSC_CTRL_REG,
242 .glob_cmd_reg = ADIS16201_GLOB_CMD_REG,
243 .diag_stat_reg = ADIS16201_DIAG_STAT_REG,
244
245 .self_test_mask = ADIS16201_MSC_CTRL_SELF_TEST_EN,
246 .self_test_reg = ADIS16201_MSC_CTRL_REG,
247 .self_test_no_autoclear = true,
248 .timeouts = &adis16201_timeouts,
249
250 .status_error_msgs = adis16201_status_error_msgs,
251 .status_error_mask = BIT(ADIS16201_DIAG_STAT_SPI_FAIL_BIT) |
252 BIT(ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT) |
253 BIT(ADIS16201_DIAG_STAT_POWER_HIGH_BIT) |
254 BIT(ADIS16201_DIAG_STAT_POWER_LOW_BIT),
255 };
256
adis16201_probe(struct spi_device * spi)257 static int adis16201_probe(struct spi_device *spi)
258 {
259 struct iio_dev *indio_dev;
260 struct adis *st;
261 int ret;
262
263 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
264 if (!indio_dev)
265 return -ENOMEM;
266
267 st = iio_priv(indio_dev);
268
269 indio_dev->name = spi->dev.driver->name;
270 indio_dev->info = &adis16201_info;
271
272 indio_dev->channels = adis16201_channels;
273 indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
274 indio_dev->modes = INDIO_DIRECT_MODE;
275
276 ret = adis_init(st, indio_dev, spi, &adis16201_data);
277 if (ret)
278 return ret;
279
280 ret = devm_adis_setup_buffer_and_trigger(st, indio_dev, NULL);
281 if (ret)
282 return ret;
283
284 ret = __adis_initial_startup(st);
285 if (ret)
286 return ret;
287
288 return devm_iio_device_register(&spi->dev, indio_dev);
289 }
290
291 static struct spi_driver adis16201_driver = {
292 .driver = {
293 .name = "adis16201",
294 },
295 .probe = adis16201_probe,
296 };
297 module_spi_driver(adis16201_driver);
298
299 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
300 MODULE_DESCRIPTION("Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer");
301 MODULE_LICENSE("GPL v2");
302 MODULE_ALIAS("spi:adis16201");
303 MODULE_IMPORT_NS(IIO_ADISLIB);
304