From: Vijay Kumar B <vijaykumar@xxxxxxxxxxxx>
Add sample code Rx to README.
Signed-off-by: Vijay Kumar B <vijaykumar@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/staging/poch/README | 123 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 123 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/poch/README b/drivers/staging/poch/README
index 600121f..ac76ff9 100644
--- 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@xxxxxxxxx> and
Vijay Kumar <vijaykumar@xxxxxxxxxxxx> and Jaya Kumar <jayakumar.lkml@xxxxxxxxx>
--
1.6.5.5
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