diff options
Diffstat (limited to 'drivers/staging/poch/README')
| -rw-r--r-- | drivers/staging/poch/README | 124 |
1 files changed, 123 insertions, 1 deletions
diff --git a/drivers/staging/poch/README b/drivers/staging/poch/README index 842afd464993..ac76ff969a2f 100644 --- a/drivers/staging/poch/README +++ b/drivers/staging/poch/README @@ -1,7 +1,6 @@ TODO: - Rx block size is limited to < 2048, hardware bug? - Group size is limited to < page size, kernel alloc/mmap API issues - - fix/workaround cache issues in circular buffer header - test whether Tx is transmitting data from provided buffers - handle device unplug case - handle temperature above threshold @@ -10,5 +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> |