1 // SPDX-License-Identifier: GPL-2.0-only
3 * BMA220 Digital triaxial acceleration sensor driver
5 * Copyright (c) 2016,2020 Intel Corporation.
8 #include <linux/bits.h>
9 #include <linux/kernel.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/spi/spi.h>
14 #include <linux/iio/buffer.h>
15 #include <linux/iio/iio.h>
16 #include <linux/iio/sysfs.h>
17 #include <linux/iio/trigger_consumer.h>
18 #include <linux/iio/triggered_buffer.h>
20 #define BMA220_REG_ID 0x00
21 #define BMA220_REG_ACCEL_X 0x02
22 #define BMA220_REG_ACCEL_Y 0x03
23 #define BMA220_REG_ACCEL_Z 0x04
24 #define BMA220_REG_RANGE 0x11
25 #define BMA220_REG_SUSPEND 0x18
27 #define BMA220_CHIP_ID 0xDD
28 #define BMA220_READ_MASK BIT(7)
29 #define BMA220_RANGE_MASK GENMASK(1, 0)
30 #define BMA220_DATA_SHIFT 2
31 #define BMA220_SUSPEND_SLEEP 0xFF
32 #define BMA220_SUSPEND_WAKE 0x00
34 #define BMA220_DEVICE_NAME "bma220"
36 #define BMA220_ACCEL_CHANNEL(index, reg, axis) { \
40 .channel2 = IIO_MOD_##axis, \
41 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
42 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
43 .scan_index = index, \
48 .shift = BMA220_DATA_SHIFT, \
49 .endianness = IIO_CPU, \
59 static const int bma220_scale_table[][2] = {
60 {0, 623000}, {1, 248000}, {2, 491000}, {4, 983000},
64 struct spi_device *spi_device;
68 /* Ensure timestamp is naturally aligned. */
69 s64 timestamp __aligned(8);
71 u8 tx_buf[2] ____cacheline_aligned;
74 static const struct iio_chan_spec bma220_channels[] = {
75 BMA220_ACCEL_CHANNEL(0, BMA220_REG_ACCEL_X, X),
76 BMA220_ACCEL_CHANNEL(1, BMA220_REG_ACCEL_Y, Y),
77 BMA220_ACCEL_CHANNEL(2, BMA220_REG_ACCEL_Z, Z),
78 IIO_CHAN_SOFT_TIMESTAMP(3),
81 static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
83 return spi_w8r8(spi, reg | BMA220_READ_MASK);
86 static const unsigned long bma220_accel_scan_masks[] = {
87 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
91 static irqreturn_t bma220_trigger_handler(int irq, void *p)
94 struct iio_poll_func *pf = p;
95 struct iio_dev *indio_dev = pf->indio_dev;
96 struct bma220_data *data = iio_priv(indio_dev);
97 struct spi_device *spi = data->spi_device;
99 mutex_lock(&data->lock);
100 data->tx_buf[0] = BMA220_REG_ACCEL_X | BMA220_READ_MASK;
101 ret = spi_write_then_read(spi, data->tx_buf, 1, &data->scan.chans,
102 ARRAY_SIZE(bma220_channels) - 1);
106 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
109 mutex_unlock(&data->lock);
110 iio_trigger_notify_done(indio_dev->trig);
115 static int bma220_read_raw(struct iio_dev *indio_dev,
116 struct iio_chan_spec const *chan,
117 int *val, int *val2, long mask)
121 struct bma220_data *data = iio_priv(indio_dev);
124 case IIO_CHAN_INFO_RAW:
125 ret = bma220_read_reg(data->spi_device, chan->address);
128 *val = sign_extend32(ret >> BMA220_DATA_SHIFT, 5);
130 case IIO_CHAN_INFO_SCALE:
131 ret = bma220_read_reg(data->spi_device, BMA220_REG_RANGE);
134 range_idx = ret & BMA220_RANGE_MASK;
135 *val = bma220_scale_table[range_idx][0];
136 *val2 = bma220_scale_table[range_idx][1];
137 return IIO_VAL_INT_PLUS_MICRO;
143 static int bma220_write_raw(struct iio_dev *indio_dev,
144 struct iio_chan_spec const *chan,
145 int val, int val2, long mask)
150 struct bma220_data *data = iio_priv(indio_dev);
153 case IIO_CHAN_INFO_SCALE:
154 for (i = 0; i < ARRAY_SIZE(bma220_scale_table); i++)
155 if (val == bma220_scale_table[i][0] &&
156 val2 == bma220_scale_table[i][1]) {
163 mutex_lock(&data->lock);
164 data->tx_buf[0] = BMA220_REG_RANGE;
165 data->tx_buf[1] = index;
166 ret = spi_write(data->spi_device, data->tx_buf,
167 sizeof(data->tx_buf));
169 dev_err(&data->spi_device->dev,
170 "failed to set measurement range\n");
171 mutex_unlock(&data->lock);
179 static int bma220_read_avail(struct iio_dev *indio_dev,
180 struct iio_chan_spec const *chan,
181 const int **vals, int *type, int *length,
185 case IIO_CHAN_INFO_SCALE:
186 *vals = (int *)bma220_scale_table;
187 *type = IIO_VAL_INT_PLUS_MICRO;
188 *length = ARRAY_SIZE(bma220_scale_table) * 2;
189 return IIO_AVAIL_LIST;
195 static const struct iio_info bma220_info = {
196 .read_raw = bma220_read_raw,
197 .write_raw = bma220_write_raw,
198 .read_avail = bma220_read_avail,
201 static int bma220_init(struct spi_device *spi)
205 ret = bma220_read_reg(spi, BMA220_REG_ID);
206 if (ret != BMA220_CHIP_ID)
209 /* Make sure the chip is powered on */
210 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
211 if (ret == BMA220_SUSPEND_WAKE)
212 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
215 if (ret == BMA220_SUSPEND_WAKE)
221 static int bma220_deinit(struct spi_device *spi)
225 /* Make sure the chip is powered off */
226 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
227 if (ret == BMA220_SUSPEND_SLEEP)
228 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
231 if (ret == BMA220_SUSPEND_SLEEP)
237 static int bma220_probe(struct spi_device *spi)
240 struct iio_dev *indio_dev;
241 struct bma220_data *data;
243 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
245 dev_err(&spi->dev, "iio allocation failed!\n");
249 data = iio_priv(indio_dev);
250 data->spi_device = spi;
251 spi_set_drvdata(spi, indio_dev);
252 mutex_init(&data->lock);
254 indio_dev->info = &bma220_info;
255 indio_dev->name = BMA220_DEVICE_NAME;
256 indio_dev->modes = INDIO_DIRECT_MODE;
257 indio_dev->channels = bma220_channels;
258 indio_dev->num_channels = ARRAY_SIZE(bma220_channels);
259 indio_dev->available_scan_masks = bma220_accel_scan_masks;
261 ret = bma220_init(data->spi_device);
265 ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time,
266 bma220_trigger_handler, NULL);
268 dev_err(&spi->dev, "iio triggered buffer setup failed\n");
272 ret = iio_device_register(indio_dev);
274 dev_err(&spi->dev, "iio_device_register failed\n");
275 iio_triggered_buffer_cleanup(indio_dev);
282 return bma220_deinit(spi);
285 static int bma220_remove(struct spi_device *spi)
287 struct iio_dev *indio_dev = spi_get_drvdata(spi);
289 iio_device_unregister(indio_dev);
290 iio_triggered_buffer_cleanup(indio_dev);
292 return bma220_deinit(spi);
295 static __maybe_unused int bma220_suspend(struct device *dev)
297 struct bma220_data *data = iio_priv(dev_get_drvdata(dev));
299 /* The chip can be suspended/woken up by a simple register read. */
300 return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
303 static __maybe_unused int bma220_resume(struct device *dev)
305 struct bma220_data *data = iio_priv(dev_get_drvdata(dev));
307 return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
309 static SIMPLE_DEV_PM_OPS(bma220_pm_ops, bma220_suspend, bma220_resume);
311 static const struct spi_device_id bma220_spi_id[] = {
316 static const struct acpi_device_id bma220_acpi_id[] = {
320 MODULE_DEVICE_TABLE(spi, bma220_spi_id);
322 static struct spi_driver bma220_driver = {
324 .name = "bma220_spi",
325 .pm = &bma220_pm_ops,
326 .acpi_match_table = bma220_acpi_id,
328 .probe = bma220_probe,
329 .remove = bma220_remove,
330 .id_table = bma220_spi_id,
332 module_spi_driver(bma220_driver);
334 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
335 MODULE_DESCRIPTION("BMA220 acceleration sensor driver");
336 MODULE_LICENSE("GPL v2");