Staging: poch: Add sample Rx code

Add sample code Rx to README.

Signed-off-by: Vijay Kumar B <vijaykumar@bravegnu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/poch/README b/drivers/staging/poch/README
index 600121f..ac76ff9 100644 (file)
--- a/drivers/staging/poch/README
+++ b/drivers/staging/poch/README
@@ -9,5 +9,128 @@ TODO:
        - audit userspace interfaces
        - get reserved major/minor if needed
 
+Sample Code:
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <error.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+
+#include <sysfs/libsysfs.h>
+
+#include <poch.h>
+
+struct pconsume {
+       uint32_t * offsets;
+       uint32_t nfetch;
+       uint32_t nflush;
+};
+
+uint32_t offsets[10];
+
+void process_group(unsigned char *buf, uint32_t size)
+{
+       uint16_t *buf16 = (uint16_t *)buf;
+
+       printf("RX: %p %u %04x %04x %04x %04x %04x %04x\n", buf, size,
+              buf16[0], buf16[1], buf16[2], buf16[3], buf16[4], buf16[5]);
+}
+
+int main()
+{
+       struct sysfs_attribute *attr;
+       char *path;
+       int ret;
+       unsigned long mmap_size;
+       int fd;
+       unsigned char *cbuf;
+
+       uint32_t nflush;
+       struct pollfd poll_fds;
+       int count = 0;
+       int i;
+
+       path = "/sys/class/pocketchange/poch0/ch0/block_size";
+       attr = sysfs_open_attribute(path);
+       ret = sysfs_write_attribute(attr, "256", strlen("256"));
+       if (ret == -1)
+               error(1, errno, "error writing attribute %s", path);
+       sysfs_close_attribute(attr);
+
+       path = "/sys/class/pocketchange/poch0/ch0/group_size";
+       attr = sysfs_open_attribute(path);
+       ret = sysfs_write_attribute(attr, "4096", strlen("4096"));
+       if (ret == -1)
+               error(1, errno, "error writing attribute %s", path);
+       sysfs_close_attribute(attr);
+
+       path = "/sys/class/pocketchange/poch0/ch0/group_count";
+       attr = sysfs_open_attribute(path);
+       ret = sysfs_write_attribute(attr, "64", strlen("64"));
+       if (ret == -1)
+               error(1, errno, "error writing attribute %s", path);
+       sysfs_close_attribute(attr);
+
+       fd = open("/dev/ch0", O_RDWR);
+       if (fd == -1)
+               error(1, errno, "error opening device node");
+
+       path = "/sys/class/pocketchange/poch0/ch0/mmap_size";
+       attr = sysfs_open_attribute(path);
+       ret = sysfs_read_attribute(attr);
+       if (ret == -1)
+               error(1, errno, "error reading attribute %s", path);
+       printf("%s", attr->value);
+       sscanf(attr->value, "%lu", &mmap_size);
+       sysfs_close_attribute(attr);
+
+       cbuf = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
+                   MAP_PRIVATE, fd, 0);
+       if (cbuf == MAP_FAILED)
+               error(1, errno, "error mapping DMA buffers");
+
+       ret = ioctl(fd, POCH_IOC_TRANSFER_START, 0);
+       if (ret == -1)
+               error(1, errno, "error starting transfer");
+
+       nflush = 0;
+       while (1) {
+               struct pconsume consume;
+
+               consume.offsets = offsets;
+               consume.nfetch = 10;
+               consume.nflush = nflush;
+
+               ret = ioctl(fd, POCH_IOC_CONSUME, &consume);
+               if (ret == -1)
+                       error(1, errno, "error consuming groups");
+
+               nflush = consume.nfetch;
+
+               for (i = 0; i < nflush; i++) {
+                       process_group(cbuf + consume.offsets[i], 4096);
+
+                       count++;
+                       if (count == 1000)
+                               break;
+               }
+
+               if (count == 1000)
+                       break;
+       }
+
+       ret = ioctl(fd, POCH_IOC_TRANSFER_STOP, 0);
+       if (ret == -1)
+               error(1, errno, "error starting transfer");
+
+       return 0;
+}
+
 Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
 Vijay Kumar <vijaykumar@bravegnu.org> and Jaya Kumar <jayakumar.lkml@gmail.com>