1 #include <linux/interrupt.h>
3 #include <linux/gpio.h>
4 #include <linux/workqueue.h>
5 #include <linux/mutex.h>
6 #include <linux/device.h>
7 #include <linux/kernel.h>
8 #include <linux/spi/spi.h>
9 #include <linux/sysfs.h>
10 #include <linux/list.h>
14 #include "../ring_sw.h"
16 #include "../trigger.h"
17 #include "adis16240.h"
20 * combine_8_to_16() utility function to munge to u8s into u16
22 static inline u16 combine_8_to_16(u8 lower, u8 upper)
26 return _lower | (_upper << 8);
29 static IIO_SCAN_EL_C(supply, ADIS16240_SCAN_SUPPLY, IIO_UNSIGNED(10),
30 ADIS16240_SUPPLY_OUT, NULL);
31 static IIO_SCAN_EL_C(accel_x, ADIS16240_SCAN_ACC_X, IIO_SIGNED(10),
32 ADIS16240_XACCL_OUT, NULL);
33 static IIO_SCAN_EL_C(accel_y, ADIS16240_SCAN_ACC_Y, IIO_SIGNED(10),
34 ADIS16240_YACCL_OUT, NULL);
35 static IIO_SCAN_EL_C(accel_z, ADIS16240_SCAN_ACC_Z, IIO_SIGNED(10),
36 ADIS16240_ZACCL_OUT, NULL);
37 static IIO_SCAN_EL_C(aux_adc, ADIS16240_SCAN_AUX_ADC, IIO_UNSIGNED(10),
38 ADIS16240_AUX_ADC, NULL);
39 static IIO_SCAN_EL_C(temp, ADIS16240_SCAN_TEMP, IIO_UNSIGNED(10),
40 ADIS16240_TEMP_OUT, NULL);
42 static IIO_SCAN_EL_TIMESTAMP(6);
44 static struct attribute *adis16240_scan_el_attrs[] = {
45 &iio_scan_el_supply.dev_attr.attr,
46 &iio_scan_el_accel_x.dev_attr.attr,
47 &iio_scan_el_accel_y.dev_attr.attr,
48 &iio_scan_el_accel_z.dev_attr.attr,
49 &iio_scan_el_aux_adc.dev_attr.attr,
50 &iio_scan_el_temp.dev_attr.attr,
51 &iio_scan_el_timestamp.dev_attr.attr,
55 static struct attribute_group adis16240_scan_el_group = {
56 .attrs = adis16240_scan_el_attrs,
57 .name = "scan_elements",
61 * adis16240_poll_func_th() top half interrupt handler called by trigger
62 * @private_data: iio_dev
64 static void adis16240_poll_func_th(struct iio_dev *indio_dev)
66 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
67 st->last_timestamp = indio_dev->trig->timestamp;
68 schedule_work(&st->work_trigger_to_ring);
72 * adis16240_read_ring_data() read data registers which will be placed into ring
73 * @dev: device associated with child of actual device (iio_dev or iio_trig)
74 * @rx: somewhere to pass back the value read
76 static int adis16240_read_ring_data(struct device *dev, u8 *rx)
78 struct spi_message msg;
79 struct iio_dev *indio_dev = dev_get_drvdata(dev);
80 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
81 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
85 mutex_lock(&st->buf_lock);
87 spi_message_init(&msg);
89 memset(xfers, 0, sizeof(xfers));
90 for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
91 xfers[i].bits_per_word = 8;
92 xfers[i].cs_change = 1;
94 xfers[i].delay_usecs = 30;
95 xfers[i].tx_buf = st->tx + 2 * i;
97 = ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
98 st->tx[2 * i + 1] = 0;
100 xfers[i].rx_buf = rx + 2 * (i - 1);
101 spi_message_add_tail(&xfers[i], &msg);
104 ret = spi_sync(st->us, &msg);
106 dev_err(&st->us->dev, "problem when burst reading");
108 mutex_unlock(&st->buf_lock);
114 static void adis16240_trigger_bh_to_ring(struct work_struct *work_s)
116 struct adis16240_state *st
117 = container_of(work_s, struct adis16240_state,
118 work_trigger_to_ring);
122 size_t datasize = st->indio_dev
123 ->ring->access.get_bpd(st->indio_dev->ring);
125 data = kmalloc(datasize , GFP_KERNEL);
127 dev_err(&st->us->dev, "memory alloc failed in ring bh");
131 if (st->indio_dev->scan_count)
132 if (adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
133 for (; i < st->indio_dev->scan_count; i++) {
134 data[i] = combine_8_to_16(st->rx[i*2+1],
138 /* Guaranteed to be aligned with 8 byte boundary */
139 if (st->indio_dev->scan_timestamp)
140 *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
142 st->indio_dev->ring->access.store_to(st->indio_dev->ring,
146 iio_trigger_notify_done(st->indio_dev->trig);
152 static int adis16240_data_rdy_ring_preenable(struct iio_dev *indio_dev)
155 dev_dbg(&indio_dev->dev, "%s\n", __func__);
156 /* Check if there are any scan elements enabled, if not fail*/
157 if (!(indio_dev->scan_count || indio_dev->scan_timestamp))
160 if (indio_dev->ring->access.set_bpd) {
161 if (indio_dev->scan_timestamp)
162 if (indio_dev->scan_count)
163 /* Timestamp (aligned sizeof(s64) and data */
164 size = (((indio_dev->scan_count * sizeof(s16))
166 & ~(sizeof(s64) - 1))
168 else /* Timestamp only */
171 size = indio_dev->scan_count*sizeof(s16);
172 indio_dev->ring->access.set_bpd(indio_dev->ring, size);
178 static int adis16240_data_rdy_ring_postenable(struct iio_dev *indio_dev)
180 return indio_dev->trig
181 ? iio_trigger_attach_poll_func(indio_dev->trig,
186 static int adis16240_data_rdy_ring_predisable(struct iio_dev *indio_dev)
188 return indio_dev->trig
189 ? iio_trigger_dettach_poll_func(indio_dev->trig,
194 void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
196 kfree(indio_dev->pollfunc);
197 iio_sw_rb_free(indio_dev->ring);
200 int adis16240_configure_ring(struct iio_dev *indio_dev)
203 struct adis16240_state *st = indio_dev->dev_data;
204 struct iio_ring_buffer *ring;
205 INIT_WORK(&st->work_trigger_to_ring, adis16240_trigger_bh_to_ring);
206 /* Set default scan mode */
208 iio_scan_mask_set(indio_dev, iio_scan_el_supply.number);
209 iio_scan_mask_set(indio_dev, iio_scan_el_accel_x.number);
210 iio_scan_mask_set(indio_dev, iio_scan_el_accel_y.number);
211 iio_scan_mask_set(indio_dev, iio_scan_el_accel_z.number);
212 iio_scan_mask_set(indio_dev, iio_scan_el_temp.number);
213 iio_scan_mask_set(indio_dev, iio_scan_el_aux_adc.number);
214 indio_dev->scan_timestamp = true;
216 indio_dev->scan_el_attrs = &adis16240_scan_el_group;
218 ring = iio_sw_rb_allocate(indio_dev);
223 indio_dev->ring = ring;
224 /* Effectively select the ring buffer implementation */
225 iio_ring_sw_register_funcs(&ring->access);
226 ring->preenable = &adis16240_data_rdy_ring_preenable;
227 ring->postenable = &adis16240_data_rdy_ring_postenable;
228 ring->predisable = &adis16240_data_rdy_ring_predisable;
229 ring->owner = THIS_MODULE;
231 indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
232 if (indio_dev->pollfunc == NULL) {
234 goto error_iio_sw_rb_free;;
236 indio_dev->pollfunc->poll_func_main = &adis16240_poll_func_th;
237 indio_dev->pollfunc->private_data = indio_dev;
238 indio_dev->modes |= INDIO_RING_TRIGGERED;
241 error_iio_sw_rb_free:
242 iio_sw_rb_free(indio_dev->ring);
246 int adis16240_initialize_ring(struct iio_ring_buffer *ring)
248 return iio_ring_buffer_register(ring, 0);
251 void adis16240_uninitialize_ring(struct iio_ring_buffer *ring)
253 iio_ring_buffer_unregister(ring);