2 * BMA220 Digital triaxial acceleration sensor driver
4 * Copyright (c) 2016, Intel Corporation.
6 * This file is subject to the terms and conditions of version 2 of
7 * the GNU General Public License. See the file COPYING in the main
8 * directory of this archive for more details.
11 #include <linux/acpi.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/iio/buffer.h>
15 #include <linux/iio/iio.h>
16 #include <linux/iio/sysfs.h>
17 #include <linux/spi/spi.h>
18 #include <linux/iio/trigger_consumer.h>
19 #include <linux/iio/triggered_buffer.h>
21 #define BMA220_REG_ID 0x00
22 #define BMA220_REG_ACCEL_X 0x02
23 #define BMA220_REG_ACCEL_Y 0x03
24 #define BMA220_REG_ACCEL_Z 0x04
25 #define BMA220_REG_RANGE 0x11
26 #define BMA220_REG_SUSPEND 0x18
28 #define BMA220_CHIP_ID 0xDD
29 #define BMA220_READ_MASK 0x80
30 #define BMA220_RANGE_MASK 0x03
31 #define BMA220_DATA_SHIFT 2
32 #define BMA220_SUSPEND_SLEEP 0xFF
33 #define BMA220_SUSPEND_WAKE 0x00
35 #define BMA220_DEVICE_NAME "bma220"
36 #define BMA220_SCALE_AVAILABLE "0.623 1.248 2.491 4.983"
38 #define BMA220_ACCEL_CHANNEL(index, reg, axis) { \
42 .channel2 = IIO_MOD_##axis, \
43 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
44 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
45 .scan_index = index, \
50 .shift = BMA220_DATA_SHIFT, \
51 .endianness = IIO_CPU, \
61 static IIO_CONST_ATTR(in_accel_scale_available, BMA220_SCALE_AVAILABLE);
63 static struct attribute *bma220_attributes[] = {
64 &iio_const_attr_in_accel_scale_available.dev_attr.attr,
68 static const struct attribute_group bma220_attribute_group = {
69 .attrs = bma220_attributes,
72 static const int bma220_scale_table[][4] = {
73 {0, 623000}, {1, 248000}, {2, 491000}, {4, 983000}
77 struct spi_device *spi_device;
81 /* Ensure timestamp is naturally aligned. */
82 s64 timestamp __aligned(8);
84 u8 tx_buf[2] ____cacheline_aligned;
87 static const struct iio_chan_spec bma220_channels[] = {
88 BMA220_ACCEL_CHANNEL(0, BMA220_REG_ACCEL_X, X),
89 BMA220_ACCEL_CHANNEL(1, BMA220_REG_ACCEL_Y, Y),
90 BMA220_ACCEL_CHANNEL(2, BMA220_REG_ACCEL_Z, Z),
91 IIO_CHAN_SOFT_TIMESTAMP(3),
94 static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
96 return spi_w8r8(spi, reg | BMA220_READ_MASK);
99 static const unsigned long bma220_accel_scan_masks[] = {
100 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
104 static irqreturn_t bma220_trigger_handler(int irq, void *p)
107 struct iio_poll_func *pf = p;
108 struct iio_dev *indio_dev = pf->indio_dev;
109 struct bma220_data *data = iio_priv(indio_dev);
110 struct spi_device *spi = data->spi_device;
112 mutex_lock(&data->lock);
113 data->tx_buf[0] = BMA220_REG_ACCEL_X | BMA220_READ_MASK;
114 ret = spi_write_then_read(spi, data->tx_buf, 1, &data->scan.chans,
115 ARRAY_SIZE(bma220_channels) - 1);
119 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
122 mutex_unlock(&data->lock);
123 iio_trigger_notify_done(indio_dev->trig);
128 static int bma220_read_raw(struct iio_dev *indio_dev,
129 struct iio_chan_spec const *chan,
130 int *val, int *val2, long mask)
134 struct bma220_data *data = iio_priv(indio_dev);
137 case IIO_CHAN_INFO_RAW:
138 ret = bma220_read_reg(data->spi_device, chan->address);
141 *val = sign_extend32(ret >> BMA220_DATA_SHIFT, 5);
143 case IIO_CHAN_INFO_SCALE:
144 ret = bma220_read_reg(data->spi_device, BMA220_REG_RANGE);
147 range_idx = ret & BMA220_RANGE_MASK;
148 *val = bma220_scale_table[range_idx][0];
149 *val2 = bma220_scale_table[range_idx][1];
150 return IIO_VAL_INT_PLUS_MICRO;
156 static int bma220_write_raw(struct iio_dev *indio_dev,
157 struct iio_chan_spec const *chan,
158 int val, int val2, long mask)
163 struct bma220_data *data = iio_priv(indio_dev);
166 case IIO_CHAN_INFO_SCALE:
167 for (i = 0; i < ARRAY_SIZE(bma220_scale_table); i++)
168 if (val == bma220_scale_table[i][0] &&
169 val2 == bma220_scale_table[i][1]) {
176 mutex_lock(&data->lock);
177 data->tx_buf[0] = BMA220_REG_RANGE;
178 data->tx_buf[1] = index;
179 ret = spi_write(data->spi_device, data->tx_buf,
180 sizeof(data->tx_buf));
182 dev_err(&data->spi_device->dev,
183 "failed to set measurement range\n");
184 mutex_unlock(&data->lock);
192 static const struct iio_info bma220_info = {
193 .driver_module = THIS_MODULE,
194 .read_raw = bma220_read_raw,
195 .write_raw = bma220_write_raw,
196 .attrs = &bma220_attribute_group,
199 static int bma220_init(struct spi_device *spi)
203 ret = bma220_read_reg(spi, BMA220_REG_ID);
204 if (ret != BMA220_CHIP_ID)
207 /* Make sure the chip is powered on */
208 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
211 else if (ret == BMA220_SUSPEND_WAKE)
212 return bma220_read_reg(spi, BMA220_REG_SUSPEND);
217 static int bma220_deinit(struct spi_device *spi)
221 /* Make sure the chip is powered off */
222 ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
225 else if (ret == BMA220_SUSPEND_SLEEP)
226 return bma220_read_reg(spi, BMA220_REG_SUSPEND);
231 static int bma220_probe(struct spi_device *spi)
234 struct iio_dev *indio_dev;
235 struct bma220_data *data;
237 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
239 dev_err(&spi->dev, "iio allocation failed!\n");
243 data = iio_priv(indio_dev);
244 data->spi_device = spi;
245 spi_set_drvdata(spi, indio_dev);
246 mutex_init(&data->lock);
248 indio_dev->dev.parent = &spi->dev;
249 indio_dev->info = &bma220_info;
250 indio_dev->name = BMA220_DEVICE_NAME;
251 indio_dev->modes = INDIO_DIRECT_MODE;
252 indio_dev->channels = bma220_channels;
253 indio_dev->num_channels = ARRAY_SIZE(bma220_channels);
254 indio_dev->available_scan_masks = bma220_accel_scan_masks;
256 ret = bma220_init(data->spi_device);
260 ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time,
261 bma220_trigger_handler, NULL);
263 dev_err(&spi->dev, "iio triggered buffer setup failed\n");
267 ret = iio_device_register(indio_dev);
269 dev_err(&spi->dev, "iio_device_register failed\n");
270 iio_triggered_buffer_cleanup(indio_dev);
277 return bma220_deinit(spi);
280 static int bma220_remove(struct spi_device *spi)
282 struct iio_dev *indio_dev = spi_get_drvdata(spi);
284 iio_device_unregister(indio_dev);
285 iio_triggered_buffer_cleanup(indio_dev);
287 return bma220_deinit(spi);
290 #ifdef CONFIG_PM_SLEEP
291 static int bma220_suspend(struct device *dev)
293 struct bma220_data *data =
294 iio_priv(spi_get_drvdata(to_spi_device(dev)));
296 /* The chip can be suspended/woken up by a simple register read. */
297 return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
300 static int bma220_resume(struct device *dev)
302 struct bma220_data *data =
303 iio_priv(spi_get_drvdata(to_spi_device(dev)));
305 return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
308 static SIMPLE_DEV_PM_OPS(bma220_pm_ops, bma220_suspend, bma220_resume);
310 #define BMA220_PM_OPS (&bma220_pm_ops)
312 #define BMA220_PM_OPS NULL
315 static const struct spi_device_id bma220_spi_id[] = {
320 static const struct acpi_device_id bma220_acpi_id[] = {
325 MODULE_DEVICE_TABLE(spi, bma220_spi_id);
327 static struct spi_driver bma220_driver = {
329 .name = "bma220_spi",
331 .acpi_match_table = ACPI_PTR(bma220_acpi_id),
333 .probe = bma220_probe,
334 .remove = bma220_remove,
335 .id_table = bma220_spi_id,
338 module_spi_driver(bma220_driver);
340 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
341 MODULE_DESCRIPTION("BMA220 acceleration sensor driver");
342 MODULE_LICENSE("GPL v2");