1 #include <linux/slab.h>
2 #include <linux/kernel.h>
3 #include <linux/module.h>
4 #include <linux/device.h>
5 #include <linux/workqueue.h>
6 #include <linux/kfifo.h>
7 #include <linux/mutex.h>
11 static inline int __iio_allocate_kfifo(struct iio_kfifo *buf,
12 int bytes_per_datum, int length)
14 if ((length == 0) || (bytes_per_datum == 0))
17 __iio_update_ring_buffer(&buf->ring, bytes_per_datum, length);
18 return kfifo_alloc(&buf->kf, bytes_per_datum*length, GFP_KERNEL);
21 int iio_request_update_kfifo(struct iio_ring_buffer *r)
24 struct iio_kfifo *buf = iio_to_kfifo(r);
26 mutex_lock(&buf->use_lock);
27 if (!buf->update_needed)
34 ret = __iio_allocate_kfifo(buf, buf->ring.bytes_per_datum,
37 mutex_unlock(&buf->use_lock);
40 EXPORT_SYMBOL(iio_request_update_kfifo);
42 void iio_mark_kfifo_in_use(struct iio_ring_buffer *r)
44 struct iio_kfifo *buf = iio_to_kfifo(r);
45 mutex_lock(&buf->use_lock);
47 mutex_unlock(&buf->use_lock);
49 EXPORT_SYMBOL(iio_mark_kfifo_in_use);
51 void iio_unmark_kfifo_in_use(struct iio_ring_buffer *r)
53 struct iio_kfifo *buf = iio_to_kfifo(r);
54 mutex_lock(&buf->use_lock);
56 mutex_unlock(&buf->use_lock);
58 EXPORT_SYMBOL(iio_unmark_kfifo_in_use);
60 int iio_get_length_kfifo(struct iio_ring_buffer *r)
64 EXPORT_SYMBOL(iio_get_length_kfifo);
66 static inline void __iio_init_kfifo(struct iio_kfifo *kf)
68 mutex_init(&kf->use_lock);
71 static IIO_RING_ENABLE_ATTR;
72 static IIO_RING_BYTES_PER_DATUM_ATTR;
73 static IIO_RING_LENGTH_ATTR;
75 static struct attribute *iio_kfifo_attributes[] = {
76 &dev_attr_length.attr,
77 &dev_attr_bytes_per_datum.attr,
78 &dev_attr_enable.attr,
82 static struct attribute_group iio_kfifo_attribute_group = {
83 .attrs = iio_kfifo_attributes,
86 static const struct attribute_group *iio_kfifo_attribute_groups[] = {
87 &iio_kfifo_attribute_group,
91 static void iio_kfifo_release(struct device *dev)
93 struct iio_ring_buffer *r = to_iio_ring_buffer(dev);
94 struct iio_kfifo *kf = iio_to_kfifo(r);
99 static struct device_type iio_kfifo_type = {
100 .release = iio_kfifo_release,
101 .groups = iio_kfifo_attribute_groups,
104 struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev)
106 struct iio_kfifo *kf;
108 kf = kzalloc(sizeof *kf, GFP_KERNEL);
111 iio_ring_buffer_init(&kf->ring, indio_dev);
112 __iio_init_kfifo(kf);
113 kf->ring.dev.type = &iio_kfifo_type;
114 device_initialize(&kf->ring.dev);
115 kf->ring.dev.parent = &indio_dev->dev;
116 kf->ring.dev.bus = &iio_bus_type;
117 dev_set_drvdata(&kf->ring.dev, (void *)&(kf->ring));
121 EXPORT_SYMBOL(iio_kfifo_allocate);
123 int iio_get_bytes_per_datum_kfifo(struct iio_ring_buffer *r)
125 return r->bytes_per_datum;
127 EXPORT_SYMBOL(iio_get_bytes_per_datum_kfifo);
129 int iio_set_bytes_per_datum_kfifo(struct iio_ring_buffer *r, size_t bpd)
131 if (r->bytes_per_datum != bpd) {
132 r->bytes_per_datum = bpd;
133 if (r->access.mark_param_change)
134 r->access.mark_param_change(r);
138 EXPORT_SYMBOL(iio_set_bytes_per_datum_kfifo);
140 int iio_mark_update_needed_kfifo(struct iio_ring_buffer *r)
142 struct iio_kfifo *kf = iio_to_kfifo(r);
143 kf->update_needed = true;
146 EXPORT_SYMBOL(iio_mark_update_needed_kfifo);
148 int iio_set_length_kfifo(struct iio_ring_buffer *r, int length)
150 if (r->length != length) {
152 if (r->access.mark_param_change)
153 r->access.mark_param_change(r);
157 EXPORT_SYMBOL(iio_set_length_kfifo);
159 void iio_kfifo_free(struct iio_ring_buffer *r)
162 iio_put_ring_buffer(r);
164 EXPORT_SYMBOL(iio_kfifo_free);
166 int iio_store_to_kfifo(struct iio_ring_buffer *r, u8 *data, s64 timestamp)
169 struct iio_kfifo *kf = iio_to_kfifo(r);
170 u8 *datal = kmalloc(r->bytes_per_datum, GFP_KERNEL);
171 memcpy(datal, data, r->bytes_per_datum - sizeof(timestamp));
172 memcpy(datal + r->bytes_per_datum - sizeof(timestamp),
173 ×tamp, sizeof(timestamp));
174 ret = kfifo_in(&kf->kf, data, r->bytes_per_datum);
175 if (ret != r->bytes_per_datum) {
182 EXPORT_SYMBOL(iio_store_to_kfifo);
184 int iio_rip_kfifo(struct iio_ring_buffer *r,
185 size_t count, char __user *buf, int *deadoffset)
188 struct iio_kfifo *kf = iio_to_kfifo(r);
191 ret = kfifo_to_user(&kf->kf, buf, r->bytes_per_datum*count, &copied);
195 EXPORT_SYMBOL(iio_rip_kfifo);
196 MODULE_LICENSE("GPL");