2 * ADIS16240 Programmable Impact Sensor and Recorder driver
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/gpio.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/spi/spi.h>
17 #include <linux/slab.h>
18 #include <linux/sysfs.h>
19 #include <linux/list.h>
20 #include <linux/module.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/buffer.h>
25 #include <linux/iio/imu/adis.h>
27 #include "adis16240.h"
29 static ssize_t adis16240_spi_read_signed(struct device *dev,
30 struct device_attribute *attr,
34 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
35 struct adis *st = iio_priv(indio_dev);
38 unsigned shift = 16 - bits;
39 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
41 ret = adis_read_reg_16(st,
42 this_attr->address, (u16 *)&val);
46 if (val & ADIS16240_ERROR_ACTIVE)
47 adis_check_status(st);
49 val = ((s16)(val << shift) >> shift);
50 return sprintf(buf, "%d\n", val);
53 static ssize_t adis16240_read_12bit_signed(struct device *dev,
54 struct device_attribute *attr,
58 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
60 /* Take the iio_dev status lock */
61 mutex_lock(&indio_dev->mlock);
62 ret = adis16240_spi_read_signed(dev, attr, buf, 12);
63 mutex_unlock(&indio_dev->mlock);
68 static IIO_DEVICE_ATTR(in_accel_xyz_squared_peak_raw, S_IRUGO,
69 adis16240_read_12bit_signed, NULL,
70 ADIS16240_XYZPEAK_OUT);
72 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
74 static const u8 adis16240_addresses[][2] = {
75 [ADIS16240_SCAN_ACC_X] = { ADIS16240_XACCL_OFF, ADIS16240_XPEAK_OUT },
76 [ADIS16240_SCAN_ACC_Y] = { ADIS16240_YACCL_OFF, ADIS16240_YPEAK_OUT },
77 [ADIS16240_SCAN_ACC_Z] = { ADIS16240_ZACCL_OFF, ADIS16240_ZPEAK_OUT },
80 static int adis16240_read_raw(struct iio_dev *indio_dev,
81 struct iio_chan_spec const *chan,
85 struct adis *st = iio_priv(indio_dev);
92 case IIO_CHAN_INFO_RAW:
93 return adis_single_conversion(indio_dev, chan,
94 ADIS16240_ERROR_ACTIVE, val);
95 case IIO_CHAN_INFO_SCALE:
98 if (chan->channel == 0) {
100 *val2 = 880000; /* 4.88 mV */
101 return IIO_VAL_INT_PLUS_MICRO;
106 *val = 244; /* 0.244 C */
108 return IIO_VAL_INT_PLUS_MICRO;
111 *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
112 return IIO_VAL_INT_PLUS_MICRO;
117 case IIO_CHAN_INFO_PEAK_SCALE:
119 *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
120 return IIO_VAL_INT_PLUS_MICRO;
121 case IIO_CHAN_INFO_OFFSET:
122 *val = 25000 / 244 - 0x133; /* 25 C = 0x133 */
124 case IIO_CHAN_INFO_CALIBBIAS:
126 mutex_lock(&indio_dev->mlock);
127 addr = adis16240_addresses[chan->scan_index][0];
128 ret = adis_read_reg_16(st, addr, &val16);
130 mutex_unlock(&indio_dev->mlock);
133 val16 &= (1 << bits) - 1;
134 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
136 mutex_unlock(&indio_dev->mlock);
138 case IIO_CHAN_INFO_PEAK:
140 mutex_lock(&indio_dev->mlock);
141 addr = adis16240_addresses[chan->scan_index][1];
142 ret = adis_read_reg_16(st, addr, &val16);
144 mutex_unlock(&indio_dev->mlock);
147 val16 &= (1 << bits) - 1;
148 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
150 mutex_unlock(&indio_dev->mlock);
156 static int adis16240_write_raw(struct iio_dev *indio_dev,
157 struct iio_chan_spec const *chan,
162 struct adis *st = iio_priv(indio_dev);
167 case IIO_CHAN_INFO_CALIBBIAS:
168 val16 = val & ((1 << bits) - 1);
169 addr = adis16240_addresses[chan->scan_index][0];
170 return adis_write_reg_16(st, addr, val16);
175 static const struct iio_chan_spec adis16240_channels[] = {
176 ADIS_SUPPLY_CHAN(ADIS16240_SUPPLY_OUT, ADIS16240_SCAN_SUPPLY, 10),
177 ADIS_AUX_ADC_CHAN(ADIS16240_AUX_ADC, ADIS16240_SCAN_AUX_ADC, 10),
178 ADIS_ACCEL_CHAN(X, ADIS16240_XACCL_OUT, ADIS16240_SCAN_ACC_X,
179 BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), 10),
180 ADIS_ACCEL_CHAN(Y, ADIS16240_YACCL_OUT, ADIS16240_SCAN_ACC_Y,
181 BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), 10),
182 ADIS_ACCEL_CHAN(Z, ADIS16240_ZACCL_OUT, ADIS16240_SCAN_ACC_Z,
183 BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), 10),
184 ADIS_TEMP_CHAN(ADIS16240_TEMP_OUT, ADIS16240_SCAN_TEMP, 10),
185 IIO_CHAN_SOFT_TIMESTAMP(6)
188 static struct attribute *adis16240_attributes[] = {
189 &iio_dev_attr_in_accel_xyz_squared_peak_raw.dev_attr.attr,
190 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
194 static const struct attribute_group adis16240_attribute_group = {
195 .attrs = adis16240_attributes,
198 static const struct iio_info adis16240_info = {
199 .attrs = &adis16240_attribute_group,
200 .read_raw = &adis16240_read_raw,
201 .write_raw = &adis16240_write_raw,
202 .update_scan_mode = adis_update_scan_mode,
203 .driver_module = THIS_MODULE,
206 static const char * const adis16240_status_error_msgs[] = {
207 [ADIS16240_DIAG_STAT_PWRON_FAIL_BIT] = "Power on, self-test failed",
208 [ADIS16240_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
209 [ADIS16240_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
210 [ADIS16240_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
211 [ADIS16240_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.225V",
214 static const struct adis_data adis16240_data = {
217 .msc_ctrl_reg = ADIS16240_MSC_CTRL,
218 .glob_cmd_reg = ADIS16240_GLOB_CMD,
219 .diag_stat_reg = ADIS16240_DIAG_STAT,
221 .self_test_mask = ADIS16240_MSC_CTRL_SELF_TEST_EN,
222 .startup_delay = ADIS16240_STARTUP_DELAY,
224 .status_error_msgs = adis16240_status_error_msgs,
225 .status_error_mask = BIT(ADIS16240_DIAG_STAT_PWRON_FAIL_BIT) |
226 BIT(ADIS16240_DIAG_STAT_SPI_FAIL_BIT) |
227 BIT(ADIS16240_DIAG_STAT_FLASH_UPT_BIT) |
228 BIT(ADIS16240_DIAG_STAT_POWER_HIGH_BIT) |
229 BIT(ADIS16240_DIAG_STAT_POWER_LOW_BIT),
232 static int adis16240_probe(struct spi_device *spi)
236 struct iio_dev *indio_dev;
238 /* setup the industrialio driver allocated elements */
239 indio_dev = iio_device_alloc(sizeof(*st));
240 if (indio_dev == NULL) {
244 st = iio_priv(indio_dev);
245 /* this is only used for removal purposes */
246 spi_set_drvdata(spi, indio_dev);
248 indio_dev->name = spi->dev.driver->name;
249 indio_dev->dev.parent = &spi->dev;
250 indio_dev->info = &adis16240_info;
251 indio_dev->channels = adis16240_channels;
252 indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
253 indio_dev->modes = INDIO_DIRECT_MODE;
255 ret = adis_init(st, indio_dev, spi, &adis16240_data);
258 ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
262 /* Get the device into a sane initial state */
263 ret = adis_initial_startup(st);
265 goto error_cleanup_buffer_trigger;
266 ret = iio_device_register(indio_dev);
268 goto error_cleanup_buffer_trigger;
271 error_cleanup_buffer_trigger:
272 adis_cleanup_buffer_and_trigger(st, indio_dev);
274 iio_device_free(indio_dev);
279 static int adis16240_remove(struct spi_device *spi)
281 struct iio_dev *indio_dev = spi_get_drvdata(spi);
282 struct adis *st = iio_priv(indio_dev);
284 iio_device_unregister(indio_dev);
285 adis_cleanup_buffer_and_trigger(st, indio_dev);
286 iio_device_free(indio_dev);
291 static struct spi_driver adis16240_driver = {
294 .owner = THIS_MODULE,
296 .probe = adis16240_probe,
297 .remove = adis16240_remove,
299 module_spi_driver(adis16240_driver);
301 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
302 MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
303 MODULE_LICENSE("GPL v2");
304 MODULE_ALIAS("spi:adis16240");