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b9618c0c MH |
1 | /* |
2 | * Copyright 2011 Analog Devices Inc. | |
3 | * | |
4 | * Licensed under the GPL-2. | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/interrupt.h> | |
9 | #include <linux/gpio.h> | |
10 | #include <linux/workqueue.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/sysfs.h> | |
15 | ||
16 | #include "../iio.h" | |
17 | #include "../ring_generic.h" | |
18 | #include "../ring_sw.h" | |
19 | #include "../trigger.h" | |
20 | #include "../sysfs.h" | |
21 | ||
22 | #include "ad7606.h" | |
23 | ||
24 | static IIO_SCAN_EL_C(in0, 0, 0, NULL); | |
25 | static IIO_SCAN_EL_C(in1, 1, 0, NULL); | |
26 | static IIO_SCAN_EL_C(in2, 2, 0, NULL); | |
27 | static IIO_SCAN_EL_C(in3, 3, 0, NULL); | |
28 | static IIO_SCAN_EL_C(in4, 4, 0, NULL); | |
29 | static IIO_SCAN_EL_C(in5, 5, 0, NULL); | |
30 | static IIO_SCAN_EL_C(in6, 6, 0, NULL); | |
31 | static IIO_SCAN_EL_C(in7, 7, 0, NULL); | |
32 | ||
dcfb0863 MH |
33 | static IIO_SCAN_EL_TIMESTAMP(8); |
34 | static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); | |
35 | ||
b9618c0c MH |
36 | static ssize_t ad7606_show_type(struct device *dev, |
37 | struct device_attribute *attr, | |
38 | char *buf) | |
39 | { | |
40 | struct iio_ring_buffer *ring = dev_get_drvdata(dev); | |
41 | struct iio_dev *indio_dev = ring->indio_dev; | |
42 | struct ad7606_state *st = indio_dev->dev_data; | |
43 | ||
44 | return sprintf(buf, "%c%d/%d\n", st->chip_info->sign, | |
45 | st->chip_info->bits, st->chip_info->bits); | |
46 | } | |
47 | static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7606_show_type, NULL, 0); | |
48 | ||
49 | static struct attribute *ad7606_scan_el_attrs[] = { | |
50 | &iio_scan_el_in0.dev_attr.attr, | |
51 | &iio_const_attr_in0_index.dev_attr.attr, | |
52 | &iio_scan_el_in1.dev_attr.attr, | |
53 | &iio_const_attr_in1_index.dev_attr.attr, | |
54 | &iio_scan_el_in2.dev_attr.attr, | |
55 | &iio_const_attr_in2_index.dev_attr.attr, | |
56 | &iio_scan_el_in3.dev_attr.attr, | |
57 | &iio_const_attr_in3_index.dev_attr.attr, | |
58 | &iio_scan_el_in4.dev_attr.attr, | |
59 | &iio_const_attr_in4_index.dev_attr.attr, | |
60 | &iio_scan_el_in5.dev_attr.attr, | |
61 | &iio_const_attr_in5_index.dev_attr.attr, | |
62 | &iio_scan_el_in6.dev_attr.attr, | |
63 | &iio_const_attr_in6_index.dev_attr.attr, | |
64 | &iio_scan_el_in7.dev_attr.attr, | |
65 | &iio_const_attr_in7_index.dev_attr.attr, | |
dcfb0863 MH |
66 | &iio_const_attr_timestamp_index.dev_attr.attr, |
67 | &iio_scan_el_timestamp.dev_attr.attr, | |
68 | &iio_const_attr_timestamp_type.dev_attr.attr, | |
b9618c0c MH |
69 | &iio_dev_attr_in_type.dev_attr.attr, |
70 | NULL, | |
71 | }; | |
72 | ||
73 | static mode_t ad7606_scan_el_attr_is_visible(struct kobject *kobj, | |
74 | struct attribute *attr, int n) | |
75 | { | |
76 | struct device *dev = container_of(kobj, struct device, kobj); | |
77 | struct iio_ring_buffer *ring = dev_get_drvdata(dev); | |
78 | struct iio_dev *indio_dev = ring->indio_dev; | |
79 | struct ad7606_state *st = indio_dev->dev_data; | |
80 | ||
81 | mode_t mode = attr->mode; | |
82 | ||
83 | if (st->chip_info->num_channels <= 6 && | |
84 | (attr == &iio_scan_el_in7.dev_attr.attr || | |
85 | attr == &iio_const_attr_in7_index.dev_attr.attr || | |
86 | attr == &iio_scan_el_in6.dev_attr.attr || | |
87 | attr == &iio_const_attr_in6_index.dev_attr.attr)) | |
88 | mode = 0; | |
89 | else if (st->chip_info->num_channels <= 4 && | |
90 | (attr == &iio_scan_el_in5.dev_attr.attr || | |
91 | attr == &iio_const_attr_in5_index.dev_attr.attr || | |
92 | attr == &iio_scan_el_in4.dev_attr.attr || | |
93 | attr == &iio_const_attr_in4_index.dev_attr.attr)) | |
94 | mode = 0; | |
95 | ||
96 | return mode; | |
97 | } | |
98 | ||
99 | static struct attribute_group ad7606_scan_el_group = { | |
100 | .name = "scan_elements", | |
101 | .attrs = ad7606_scan_el_attrs, | |
102 | .is_visible = ad7606_scan_el_attr_is_visible, | |
103 | }; | |
104 | ||
105 | int ad7606_scan_from_ring(struct ad7606_state *st, unsigned ch) | |
106 | { | |
107 | struct iio_ring_buffer *ring = st->indio_dev->ring; | |
108 | int ret; | |
109 | u16 *ring_data; | |
110 | ||
111 | ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL); | |
112 | if (ring_data == NULL) { | |
113 | ret = -ENOMEM; | |
114 | goto error_ret; | |
115 | } | |
116 | ret = ring->access.read_last(ring, (u8 *) ring_data); | |
117 | if (ret) | |
118 | goto error_free_ring_data; | |
119 | ||
120 | ret = ring_data[ch]; | |
121 | ||
122 | error_free_ring_data: | |
123 | kfree(ring_data); | |
124 | error_ret: | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /** | |
129 | * ad7606_ring_preenable() setup the parameters of the ring before enabling | |
130 | * | |
131 | * The complex nature of the setting of the nuber of bytes per datum is due | |
132 | * to this driver currently ensuring that the timestamp is stored at an 8 | |
133 | * byte boundary. | |
134 | **/ | |
135 | static int ad7606_ring_preenable(struct iio_dev *indio_dev) | |
136 | { | |
137 | struct ad7606_state *st = indio_dev->dev_data; | |
138 | struct iio_ring_buffer *ring = indio_dev->ring; | |
139 | size_t d_size; | |
140 | ||
141 | d_size = st->chip_info->num_channels * | |
dcfb0863 MH |
142 | st->chip_info->bits / 8; |
143 | ||
144 | if (ring->scan_timestamp) { | |
145 | d_size += sizeof(s64); | |
b9618c0c | 146 | |
dcfb0863 MH |
147 | if (d_size % sizeof(s64)) |
148 | d_size += sizeof(s64) - (d_size % sizeof(s64)); | |
149 | } | |
b9618c0c MH |
150 | |
151 | if (ring->access.set_bytes_per_datum) | |
152 | ring->access.set_bytes_per_datum(ring, d_size); | |
153 | ||
154 | st->d_size = d_size; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | /** | |
13cfac20 | 160 | * ad7606_trigger_handler_th() th of trigger launched polling to ring buffer |
b9618c0c MH |
161 | * |
162 | **/ | |
13cfac20 | 163 | static irqreturn_t ad7606_trigger_handler_th(int irq, void *p) |
b9618c0c | 164 | { |
13cfac20 JC |
165 | struct iio_poll_func *pf = p; |
166 | struct iio_dev *indio_dev = pf->private_data; | |
b9618c0c MH |
167 | struct ad7606_state *st = indio_dev->dev_data; |
168 | gpio_set_value(st->pdata->gpio_convst, 1); | |
169 | ||
13cfac20 | 170 | return IRQ_HANDLED; |
b9618c0c | 171 | } |
13cfac20 | 172 | |
b9618c0c MH |
173 | /** |
174 | * ad7606_poll_bh_to_ring() bh of trigger launched polling to ring buffer | |
175 | * @work_s: the work struct through which this was scheduled | |
176 | * | |
177 | * Currently there is no option in this driver to disable the saving of | |
178 | * timestamps within the ring. | |
179 | * I think the one copy of this at a time was to avoid problems if the | |
180 | * trigger was set far too high and the reads then locked up the computer. | |
181 | **/ | |
182 | static void ad7606_poll_bh_to_ring(struct work_struct *work_s) | |
183 | { | |
184 | struct ad7606_state *st = container_of(work_s, struct ad7606_state, | |
185 | poll_work); | |
186 | struct iio_dev *indio_dev = st->indio_dev; | |
187 | struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring); | |
188 | struct iio_ring_buffer *ring = indio_dev->ring; | |
189 | s64 time_ns; | |
190 | __u8 *buf; | |
191 | int ret; | |
192 | ||
193 | /* Ensure only one copy of this function running at a time */ | |
194 | if (atomic_inc_return(&st->protect_ring) > 1) | |
195 | return; | |
196 | ||
197 | buf = kzalloc(st->d_size, GFP_KERNEL); | |
198 | if (buf == NULL) | |
199 | return; | |
200 | ||
201 | if (st->have_frstdata) { | |
202 | ret = st->bops->read_block(st->dev, 1, buf); | |
203 | if (ret) | |
204 | goto done; | |
205 | if (!gpio_get_value(st->pdata->gpio_frstdata)) { | |
206 | /* This should never happen. However | |
207 | * some signal glitch caused by bad PCB desgin or | |
208 | * electrostatic discharge, could cause an extra read | |
209 | * or clock. This allows recovery. | |
210 | */ | |
211 | ad7606_reset(st); | |
212 | goto done; | |
213 | } | |
214 | ret = st->bops->read_block(st->dev, | |
215 | st->chip_info->num_channels - 1, buf + 2); | |
216 | if (ret) | |
217 | goto done; | |
218 | } else { | |
219 | ret = st->bops->read_block(st->dev, | |
220 | st->chip_info->num_channels, buf); | |
221 | if (ret) | |
222 | goto done; | |
223 | } | |
224 | ||
225 | time_ns = iio_get_time_ns(); | |
dcfb0863 MH |
226 | |
227 | if (ring->scan_timestamp) | |
228 | memcpy(buf + st->d_size - sizeof(s64), | |
229 | &time_ns, sizeof(time_ns)); | |
b9618c0c MH |
230 | |
231 | ring->access.store_to(&sw_ring->buf, buf, time_ns); | |
232 | done: | |
233 | gpio_set_value(st->pdata->gpio_convst, 0); | |
234 | kfree(buf); | |
235 | atomic_dec(&st->protect_ring); | |
236 | } | |
237 | ||
238 | int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev) | |
239 | { | |
240 | struct ad7606_state *st = indio_dev->dev_data; | |
241 | int ret; | |
242 | ||
243 | indio_dev->ring = iio_sw_rb_allocate(indio_dev); | |
244 | if (!indio_dev->ring) { | |
245 | ret = -ENOMEM; | |
246 | goto error_ret; | |
247 | } | |
248 | ||
249 | /* Effectively select the ring buffer implementation */ | |
250 | iio_ring_sw_register_funcs(&indio_dev->ring->access); | |
13cfac20 JC |
251 | indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL); |
252 | if (indio_dev->pollfunc == NULL) { | |
253 | ret = -ENOMEM; | |
b9618c0c | 254 | goto error_deallocate_sw_rb; |
13cfac20 JC |
255 | } |
256 | indio_dev->pollfunc->private_data = indio_dev; | |
257 | indio_dev->pollfunc->h = &ad7606_trigger_handler_th; | |
258 | indio_dev->pollfunc->name = | |
259 | kasprintf(GFP_KERNEL, "%s_consumer%d", indio_dev->name, | |
260 | indio_dev->id); | |
261 | if (indio_dev->pollfunc->name == NULL) { | |
262 | ret = -ENOMEM; | |
263 | goto error_free_poll_func; | |
264 | } | |
b9618c0c MH |
265 | /* Ring buffer functions - here trigger setup related */ |
266 | ||
267 | indio_dev->ring->preenable = &ad7606_ring_preenable; | |
268 | indio_dev->ring->postenable = &iio_triggered_ring_postenable; | |
269 | indio_dev->ring->predisable = &iio_triggered_ring_predisable; | |
270 | indio_dev->ring->scan_el_attrs = &ad7606_scan_el_group; | |
dcfb0863 | 271 | indio_dev->ring->scan_timestamp = true ; |
b9618c0c MH |
272 | |
273 | INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring); | |
274 | ||
275 | /* Flag that polled ring buffering is possible */ | |
276 | indio_dev->modes |= INDIO_RING_TRIGGERED; | |
277 | return 0; | |
13cfac20 JC |
278 | error_free_poll_func: |
279 | kfree(indio_dev->pollfunc); | |
b9618c0c MH |
280 | error_deallocate_sw_rb: |
281 | iio_sw_rb_free(indio_dev->ring); | |
282 | error_ret: | |
283 | return ret; | |
284 | } | |
285 | ||
286 | void ad7606_ring_cleanup(struct iio_dev *indio_dev) | |
287 | { | |
288 | if (indio_dev->trig) { | |
289 | iio_put_trigger(indio_dev->trig); | |
290 | iio_trigger_dettach_poll_func(indio_dev->trig, | |
291 | indio_dev->pollfunc); | |
292 | } | |
13cfac20 | 293 | kfree(indio_dev->pollfunc->name); |
b9618c0c MH |
294 | kfree(indio_dev->pollfunc); |
295 | iio_sw_rb_free(indio_dev->ring); | |
296 | } |