Commit | Line | Data |
---|---|---|
2b4756aa | 1 | /* |
596d0609 | 2 | * Copyright 2010-2011 Analog Devices Inc. |
2b4756aa MH |
3 | * Copyright (C) 2008 Jonathan Cameron |
4 | * | |
596d0609 | 5 | * Licensed under the GPL-2. |
2b4756aa MH |
6 | * |
7 | * ad7887_ring.c | |
8 | */ | |
9 | ||
10 | #include <linux/interrupt.h> | |
2b4756aa MH |
11 | #include <linux/kernel.h> |
12 | #include <linux/slab.h> | |
2b4756aa MH |
13 | #include <linux/spi/spi.h> |
14 | ||
06458e27 JC |
15 | #include <linux/iio/iio.h> |
16 | #include <linux/iio/buffer.h> | |
2b4756aa | 17 | #include "../ring_sw.h" |
06458e27 | 18 | #include <linux/iio/trigger_consumer.h> |
2b4756aa MH |
19 | |
20 | #include "ad7887.h" | |
21 | ||
2b4756aa MH |
22 | /** |
23 | * ad7887_ring_preenable() setup the parameters of the ring before enabling | |
24 | * | |
25 | * The complex nature of the setting of the nuber of bytes per datum is due | |
26 | * to this driver currently ensuring that the timestamp is stored at an 8 | |
27 | * byte boundary. | |
28 | **/ | |
29 | static int ad7887_ring_preenable(struct iio_dev *indio_dev) | |
30 | { | |
f490f42b | 31 | struct ad7887_state *st = iio_priv(indio_dev); |
a64c0634 | 32 | int ret; |
2b4756aa | 33 | |
a64c0634 JC |
34 | ret = iio_sw_buffer_preenable(indio_dev); |
35 | if (ret < 0) | |
36 | return ret; | |
e08d0265 | 37 | |
32b5eeca | 38 | /* We know this is a single long so can 'cheat' */ |
550268ca | 39 | switch (*indio_dev->active_scan_mask) { |
2b4756aa MH |
40 | case (1 << 0): |
41 | st->ring_msg = &st->msg[AD7887_CH0]; | |
42 | break; | |
43 | case (1 << 1): | |
44 | st->ring_msg = &st->msg[AD7887_CH1]; | |
45 | /* Dummy read: push CH1 setting down to hardware */ | |
46 | spi_sync(st->spi, st->ring_msg); | |
47 | break; | |
48 | case ((1 << 1) | (1 << 0)): | |
49 | st->ring_msg = &st->msg[AD7887_CH0_CH1]; | |
50 | break; | |
51 | } | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int ad7887_ring_postdisable(struct iio_dev *indio_dev) | |
57 | { | |
f490f42b | 58 | struct ad7887_state *st = iio_priv(indio_dev); |
2b4756aa MH |
59 | |
60 | /* dummy read: restore default CH0 settin */ | |
61 | return spi_sync(st->spi, &st->msg[AD7887_CH0]); | |
62 | } | |
63 | ||
64 | /** | |
e362dfbb | 65 | * ad7887_trigger_handler() bh of trigger launched polling to ring buffer |
2b4756aa MH |
66 | * |
67 | * Currently there is no option in this driver to disable the saving of | |
68 | * timestamps within the ring. | |
2b4756aa | 69 | **/ |
e362dfbb | 70 | static irqreturn_t ad7887_trigger_handler(int irq, void *p) |
2b4756aa | 71 | { |
e362dfbb | 72 | struct iio_poll_func *pf = p; |
e65bc6ac | 73 | struct iio_dev *indio_dev = pf->indio_dev; |
f490f42b | 74 | struct ad7887_state *st = iio_priv(indio_dev); |
2b4756aa MH |
75 | s64 time_ns; |
76 | __u8 *buf; | |
77 | int b_sent; | |
2b4756aa | 78 | |
550268ca JC |
79 | unsigned int bytes = bitmap_weight(indio_dev->active_scan_mask, |
80 | indio_dev->masklength) * | |
596d0609 | 81 | st->chip_info->channel[0].scan_type.storagebits / 8; |
2b4756aa | 82 | |
a64c0634 | 83 | buf = kzalloc(indio_dev->scan_bytes, GFP_KERNEL); |
2b4756aa | 84 | if (buf == NULL) |
e362dfbb | 85 | return -ENOMEM; |
2b4756aa MH |
86 | |
87 | b_sent = spi_sync(st->spi, st->ring_msg); | |
88 | if (b_sent) | |
89 | goto done; | |
90 | ||
91 | time_ns = iio_get_time_ns(); | |
92 | ||
93 | memcpy(buf, st->data, bytes); | |
fd6487f8 | 94 | if (indio_dev->scan_timestamp) |
a64c0634 | 95 | memcpy(buf + indio_dev->scan_bytes - sizeof(s64), |
e362dfbb | 96 | &time_ns, sizeof(time_ns)); |
2b4756aa | 97 | |
14555b14 | 98 | indio_dev->buffer->access->store_to(indio_dev->buffer, buf, time_ns); |
2b4756aa MH |
99 | done: |
100 | kfree(buf); | |
596d0609 | 101 | iio_trigger_notify_done(indio_dev->trig); |
e362dfbb JC |
102 | |
103 | return IRQ_HANDLED; | |
2b4756aa MH |
104 | } |
105 | ||
14555b14 | 106 | static const struct iio_buffer_setup_ops ad7887_ring_setup_ops = { |
5565a450 | 107 | .preenable = &ad7887_ring_preenable, |
3b99fb76 JC |
108 | .postenable = &iio_triggered_buffer_postenable, |
109 | .predisable = &iio_triggered_buffer_predisable, | |
5565a450 JC |
110 | .postdisable = &ad7887_ring_postdisable, |
111 | }; | |
112 | ||
2b4756aa MH |
113 | int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
114 | { | |
2b4756aa MH |
115 | int ret; |
116 | ||
14555b14 JC |
117 | indio_dev->buffer = iio_sw_rb_allocate(indio_dev); |
118 | if (!indio_dev->buffer) { | |
2b4756aa MH |
119 | ret = -ENOMEM; |
120 | goto error_ret; | |
121 | } | |
0ed731d2 JC |
122 | indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time, |
123 | &ad7887_trigger_handler, | |
124 | IRQF_ONESHOT, | |
125 | indio_dev, | |
126 | "ad7887_consumer%d", | |
127 | indio_dev->id); | |
e362dfbb JC |
128 | if (indio_dev->pollfunc == NULL) { |
129 | ret = -ENOMEM; | |
2b4756aa | 130 | goto error_deallocate_sw_rb; |
e362dfbb | 131 | } |
2b4756aa | 132 | /* Ring buffer functions - here trigger setup related */ |
1612244f | 133 | indio_dev->setup_ops = &ad7887_ring_setup_ops; |
2b4756aa | 134 | |
2b4756aa | 135 | /* Flag that polled ring buffering is possible */ |
ec3afa40 | 136 | indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
2b4756aa | 137 | return 0; |
0ed731d2 | 138 | |
2b4756aa | 139 | error_deallocate_sw_rb: |
14555b14 | 140 | iio_sw_rb_free(indio_dev->buffer); |
2b4756aa MH |
141 | error_ret: |
142 | return ret; | |
143 | } | |
144 | ||
145 | void ad7887_ring_cleanup(struct iio_dev *indio_dev) | |
146 | { | |
0ed731d2 | 147 | iio_dealloc_pollfunc(indio_dev->pollfunc); |
14555b14 | 148 | iio_sw_rb_free(indio_dev->buffer); |
2b4756aa | 149 | } |