staging: ozwpan: Added character device support
The character device provides a management interface to the driver and also provides an additional service to the protocol for side band communication with the device. Signed-off-by: Chris Kelly <ckelly@ozmodevices.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Kelly
Greg Kroah-Hartman
parent
b3147863b5
commit
23af8c2a08
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@ -0,0 +1,46 @@
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/* -----------------------------------------------------------------------------
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* Copyright (c) 2011 Ozmo Inc
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* Released under the GNU General Public License Version 2 (GPLv2).
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* -----------------------------------------------------------------------------
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*/
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#ifndef _OZAPPIF_H
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#define _OZAPPIF_H
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#include "ozeventdef.h"
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#define OZ_IOCTL_MAGIC 0xf4
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struct oz_mac_addr {
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unsigned char a[6];
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};
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#define OZ_MAX_PDS 8
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struct oz_pd_list {
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int count;
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struct oz_mac_addr addr[OZ_MAX_PDS];
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};
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#define OZ_MAX_BINDING_LEN 32
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struct oz_binding_info {
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char name[OZ_MAX_BINDING_LEN];
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};
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struct oz_test {
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int action;
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};
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#define OZ_IOCTL_GET_PD_LIST _IOR(OZ_IOCTL_MAGIC, 0, struct oz_pd_list)
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#define OZ_IOCTL_SET_ACTIVE_PD _IOW(OZ_IOCTL_MAGIC, 1, struct oz_mac_addr)
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#define OZ_IOCTL_GET_ACTIVE_PD _IOR(OZ_IOCTL_MAGIC, 2, struct oz_mac_addr)
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#define OZ_IOCTL_CLEAR_EVENTS _IO(OZ_IOCTL_MAGIC, 3)
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#define OZ_IOCTL_GET_EVENTS _IOR(OZ_IOCTL_MAGIC, 4, struct oz_evtlist)
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#define OZ_IOCTL_ADD_BINDING _IOW(OZ_IOCTL_MAGIC, 5, struct oz_binding_info)
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#define OZ_IOCTL_TEST _IOWR(OZ_IOCTL_MAGIC, 6, struct oz_test)
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#define OZ_IOCTL_SET_EVENT_MASK _IOW(OZ_IOCTL_MAGIC, 7, unsigned long)
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#define OZ_IOCTL_REMOVE_BINDING _IOW(OZ_IOCTL_MAGIC, 8, struct oz_binding_info)
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#define OZ_IOCTL_MAX 9
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#endif /* _OZAPPIF_H */
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@ -0,0 +1,524 @@
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/* -----------------------------------------------------------------------------
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* Copyright (c) 2011 Ozmo Inc
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* Released under the GNU General Public License Version 2 (GPLv2).
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* -----------------------------------------------------------------------------
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/uaccess.h>
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#include <linux/netdevice.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include "ozconfig.h"
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#include "ozprotocol.h"
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#include "oztrace.h"
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#include "ozappif.h"
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#include "ozeltbuf.h"
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#include "ozpd.h"
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#include "ozproto.h"
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#include "ozalloc.h"
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#include "ozevent.h"
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/*------------------------------------------------------------------------------
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*/
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#define OZ_RD_BUF_SZ 256
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struct oz_cdev {
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dev_t devnum;
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struct cdev cdev;
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wait_queue_head_t rdq;
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spinlock_t lock;
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u8 active_addr[ETH_ALEN];
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struct oz_pd *active_pd;
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};
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/* Per PD context for the serial service stored in the PD. */
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struct oz_serial_ctx {
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atomic_t ref_count;
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u8 tx_seq_num;
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u8 rx_seq_num;
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u8 rd_buf[OZ_RD_BUF_SZ];
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int rd_in;
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int rd_out;
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};
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/*------------------------------------------------------------------------------
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*/
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int g_taction;
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/*------------------------------------------------------------------------------
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*/
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static struct oz_cdev g_cdev;
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/*------------------------------------------------------------------------------
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* Context: process and softirq
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*/
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static struct oz_serial_ctx *oz_cdev_claim_ctx(struct oz_pd *pd)
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{
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struct oz_serial_ctx *ctx;
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spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
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ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
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if (ctx)
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atomic_inc(&ctx->ref_count);
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spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
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return ctx;
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}
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/*------------------------------------------------------------------------------
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* Context: softirq or process
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*/
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static void oz_cdev_release_ctx(struct oz_serial_ctx *ctx)
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{
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if (atomic_dec_and_test(&ctx->ref_count)) {
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oz_trace("Dealloc serial context.\n");
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oz_free(ctx);
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}
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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int oz_cdev_open(struct inode *inode, struct file *filp)
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{
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struct oz_cdev *dev;
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oz_trace("oz_cdev_open()\n");
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oz_trace("major = %d minor = %d\n", imajor(inode), iminor(inode));
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dev = container_of(inode->i_cdev, struct oz_cdev, cdev);
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filp->private_data = dev;
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return 0;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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int oz_cdev_release(struct inode *inode, struct file *filp)
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{
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oz_trace("oz_cdev_release()\n");
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return 0;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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ssize_t oz_cdev_read(struct file *filp, char __user *buf, size_t count,
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loff_t *fpos)
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{
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int n;
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int ix;
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struct oz_pd *pd;
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struct oz_serial_ctx *ctx = 0;
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spin_lock_bh(&g_cdev.lock);
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pd = g_cdev.active_pd;
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if (pd)
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oz_pd_get(pd);
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spin_unlock_bh(&g_cdev.lock);
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if (pd == 0)
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return -1;
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ctx = oz_cdev_claim_ctx(pd);
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if (ctx == 0)
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goto out2;
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n = ctx->rd_in - ctx->rd_out;
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if (n < 0)
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n += OZ_RD_BUF_SZ;
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if (count > n)
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count = n;
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ix = ctx->rd_out;
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n = OZ_RD_BUF_SZ - ix;
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if (n > count)
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n = count;
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if (copy_to_user(buf, &ctx->rd_buf[ix], n)) {
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count = 0;
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goto out1;
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}
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ix += n;
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if (ix == OZ_RD_BUF_SZ)
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ix = 0;
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if (n < count) {
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if (copy_to_user(&buf[n], ctx->rd_buf, count-n)) {
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count = 0;
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goto out1;
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}
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ix = count-n;
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}
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ctx->rd_out = ix;
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out1:
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oz_cdev_release_ctx(ctx);
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out2:
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oz_pd_put(pd);
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return count;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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ssize_t oz_cdev_write(struct file *filp, const char __user *buf, size_t count,
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loff_t *fpos)
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{
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struct oz_pd *pd;
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struct oz_elt_buf *eb;
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struct oz_elt_info *ei = 0;
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struct oz_elt *elt;
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struct oz_app_hdr *app_hdr;
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struct oz_serial_ctx *ctx;
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spin_lock_bh(&g_cdev.lock);
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pd = g_cdev.active_pd;
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if (pd)
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oz_pd_get(pd);
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spin_unlock_bh(&g_cdev.lock);
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if (pd == 0)
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return -1;
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eb = &pd->elt_buff;
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ei = oz_elt_info_alloc(eb);
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if (ei == 0) {
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count = 0;
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goto out;
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}
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elt = (struct oz_elt *)ei->data;
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app_hdr = (struct oz_app_hdr *)(elt+1);
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elt->length = sizeof(struct oz_app_hdr) + count;
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elt->type = OZ_ELT_APP_DATA;
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ei->app_id = OZ_APPID_SERIAL;
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ei->length = elt->length + sizeof(struct oz_elt);
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app_hdr->app_id = OZ_APPID_SERIAL;
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if (copy_from_user(app_hdr+1, buf, count))
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goto out;
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spin_lock_bh(&pd->app_lock[OZ_APPID_USB-1]);
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ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
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if (ctx) {
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app_hdr->elt_seq_num = ctx->tx_seq_num++;
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if (ctx->tx_seq_num == 0)
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ctx->tx_seq_num = 1;
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spin_lock(&eb->lock);
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if (oz_queue_elt_info(eb, 0, 0, ei) == 0)
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ei = 0;
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spin_unlock(&eb->lock);
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}
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spin_unlock_bh(&pd->app_lock[OZ_APPID_USB-1]);
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out:
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if (ei) {
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count = 0;
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spin_lock_bh(&eb->lock);
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oz_elt_info_free(eb, ei);
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spin_unlock_bh(&eb->lock);
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}
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oz_pd_put(pd);
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return count;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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static int oz_set_active_pd(u8 *addr)
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{
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int rc = 0;
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struct oz_pd *pd;
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struct oz_pd *old_pd;
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pd = oz_pd_find(addr);
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if (pd) {
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spin_lock_bh(&g_cdev.lock);
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memcpy(g_cdev.active_addr, addr, ETH_ALEN);
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old_pd = g_cdev.active_pd;
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g_cdev.active_pd = pd;
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spin_unlock_bh(&g_cdev.lock);
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if (old_pd)
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oz_pd_put(old_pd);
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} else {
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if (!memcmp(addr, "\0\0\0\0\0\0", sizeof(addr))) {
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spin_lock_bh(&g_cdev.lock);
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pd = g_cdev.active_pd;
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g_cdev.active_pd = 0;
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memset(g_cdev.active_addr, 0,
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sizeof(g_cdev.active_addr));
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spin_unlock_bh(&g_cdev.lock);
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if (pd)
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oz_pd_put(pd);
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} else {
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rc = -1;
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}
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}
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return rc;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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long oz_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int rc = 0;
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if (_IOC_TYPE(cmd) != OZ_IOCTL_MAGIC)
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return -ENOTTY;
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if (_IOC_NR(cmd) > OZ_IOCTL_MAX)
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return -ENOTTY;
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if (_IOC_DIR(cmd) & _IOC_READ)
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rc = !access_ok(VERIFY_WRITE, (void __user *)arg,
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_IOC_SIZE(cmd));
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else if (_IOC_DIR(cmd) & _IOC_WRITE)
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rc = !access_ok(VERIFY_READ, (void __user *)arg,
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_IOC_SIZE(cmd));
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if (rc)
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return -EFAULT;
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switch (cmd) {
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case OZ_IOCTL_GET_PD_LIST: {
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struct oz_pd_list list;
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oz_trace("OZ_IOCTL_GET_PD_LIST\n");
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list.count = oz_get_pd_list(list.addr, OZ_MAX_PDS);
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if (copy_to_user((void __user *)arg, &list,
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sizeof(list)))
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return -EFAULT;
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}
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break;
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case OZ_IOCTL_SET_ACTIVE_PD: {
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u8 addr[ETH_ALEN];
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oz_trace("OZ_IOCTL_SET_ACTIVE_PD\n");
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if (copy_from_user(addr, (void __user *)arg, ETH_ALEN))
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return -EFAULT;
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rc = oz_set_active_pd(addr);
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}
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break;
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case OZ_IOCTL_GET_ACTIVE_PD: {
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u8 addr[ETH_ALEN];
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oz_trace("OZ_IOCTL_GET_ACTIVE_PD\n");
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spin_lock_bh(&g_cdev.lock);
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memcpy(addr, g_cdev.active_addr, ETH_ALEN);
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spin_unlock_bh(&g_cdev.lock);
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if (copy_to_user((void __user *)arg, addr, ETH_ALEN))
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return -EFAULT;
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}
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break;
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#ifdef WANT_EVENT_TRACE
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case OZ_IOCTL_CLEAR_EVENTS:
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oz_events_clear();
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break;
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case OZ_IOCTL_GET_EVENTS:
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rc = oz_events_copy((void __user *)arg);
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break;
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case OZ_IOCTL_SET_EVENT_MASK:
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if (copy_from_user(&g_evt_mask, (void __user *)arg,
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sizeof(unsigned long))) {
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return -EFAULT;
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}
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break;
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#endif /* WANT_EVENT_TRACE */
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case OZ_IOCTL_ADD_BINDING:
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case OZ_IOCTL_REMOVE_BINDING: {
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struct oz_binding_info b;
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if (copy_from_user(&b, (void __user *)arg,
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sizeof(struct oz_binding_info))) {
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return -EFAULT;
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}
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/* Make sure name is null terminated. */
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b.name[OZ_MAX_BINDING_LEN-1] = 0;
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if (cmd == OZ_IOCTL_ADD_BINDING)
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oz_binding_add(b.name);
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else
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oz_binding_remove(b.name);
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}
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break;
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}
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return rc;
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}
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/*------------------------------------------------------------------------------
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* Context: process
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*/
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unsigned int oz_cdev_poll(struct file *filp, poll_table *wait)
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{
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unsigned int ret = 0;
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struct oz_cdev *dev = filp->private_data;
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oz_trace("Poll called wait = %p\n", wait);
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spin_lock_bh(&dev->lock);
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if (dev->active_pd) {
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struct oz_serial_ctx *ctx = oz_cdev_claim_ctx(dev->active_pd);
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if (ctx) {
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if (ctx->rd_in != ctx->rd_out)
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ret |= POLLIN | POLLRDNORM;
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oz_cdev_release_ctx(ctx);
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}
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}
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spin_unlock_bh(&dev->lock);
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if (wait)
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poll_wait(filp, &dev->rdq, wait);
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return ret;
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}
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/*------------------------------------------------------------------------------
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*/
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const struct file_operations oz_fops = {
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.owner = THIS_MODULE,
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.open = oz_cdev_open,
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.release = oz_cdev_release,
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.read = oz_cdev_read,
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.write = oz_cdev_write,
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.unlocked_ioctl = oz_cdev_ioctl,
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.poll = oz_cdev_poll
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};
|
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/*------------------------------------------------------------------------------
|
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* Context: process
|
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*/
|
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int oz_cdev_register(void)
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{
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int err;
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memset(&g_cdev, 0, sizeof(g_cdev));
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err = alloc_chrdev_region(&g_cdev.devnum, 0, 1, "ozwpan");
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if (err < 0)
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return err;
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oz_trace("Alloc dev number %d:%d\n", MAJOR(g_cdev.devnum),
|
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MINOR(g_cdev.devnum));
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cdev_init(&g_cdev.cdev, &oz_fops);
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g_cdev.cdev.owner = THIS_MODULE;
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g_cdev.cdev.ops = &oz_fops;
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spin_lock_init(&g_cdev.lock);
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init_waitqueue_head(&g_cdev.rdq);
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err = cdev_add(&g_cdev.cdev, g_cdev.devnum, 1);
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return 0;
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}
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/*------------------------------------------------------------------------------
|
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* Context: process
|
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*/
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int oz_cdev_deregister(void)
|
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{
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cdev_del(&g_cdev.cdev);
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unregister_chrdev_region(g_cdev.devnum, 1);
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return 0;
|
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}
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/*------------------------------------------------------------------------------
|
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* Context: process
|
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*/
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int oz_cdev_init(void)
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{
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oz_event_log(OZ_EVT_SERVICE, 1, OZ_APPID_SERIAL, 0, 0);
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oz_app_enable(OZ_APPID_SERIAL, 1);
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return 0;
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}
|
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/*------------------------------------------------------------------------------
|
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* Context: process
|
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*/
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void oz_cdev_term(void)
|
||||
{
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oz_event_log(OZ_EVT_SERVICE, 2, OZ_APPID_SERIAL, 0, 0);
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oz_app_enable(OZ_APPID_SERIAL, 0);
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}
|
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/*------------------------------------------------------------------------------
|
||||
* Context: softirq-serialized
|
||||
*/
|
||||
int oz_cdev_start(struct oz_pd *pd, int resume)
|
||||
{
|
||||
struct oz_serial_ctx *ctx;
|
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struct oz_serial_ctx *old_ctx = 0;
|
||||
oz_event_log(OZ_EVT_SERVICE, 3, OZ_APPID_SERIAL, 0, resume);
|
||||
if (resume) {
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oz_trace("Serial service resumed.\n");
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return 0;
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}
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ctx = (struct oz_serial_ctx *)
|
||||
oz_alloc(sizeof(struct oz_serial_ctx), GFP_ATOMIC);
|
||||
if (ctx == 0)
|
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return -1;
|
||||
memset(ctx, 0, sizeof(struct oz_serial_ctx));
|
||||
atomic_set(&ctx->ref_count, 1);
|
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ctx->tx_seq_num = 1;
|
||||
spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
|
||||
old_ctx = pd->app_ctx[OZ_APPID_SERIAL-1];
|
||||
if (old_ctx) {
|
||||
spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
|
||||
oz_free(ctx);
|
||||
} else {
|
||||
pd->app_ctx[OZ_APPID_SERIAL-1] = ctx;
|
||||
spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
|
||||
}
|
||||
spin_lock(&g_cdev.lock);
|
||||
if ((g_cdev.active_pd == 0) &&
|
||||
(memcmp(pd->mac_addr, g_cdev.active_addr, ETH_ALEN) == 0)) {
|
||||
oz_pd_get(pd);
|
||||
g_cdev.active_pd = pd;
|
||||
oz_trace("Active PD arrived.\n");
|
||||
}
|
||||
spin_unlock(&g_cdev.lock);
|
||||
oz_trace("Serial service started.\n");
|
||||
return 0;
|
||||
}
|
||||
/*------------------------------------------------------------------------------
|
||||
* Context: softirq or process
|
||||
*/
|
||||
void oz_cdev_stop(struct oz_pd *pd, int pause)
|
||||
{
|
||||
struct oz_serial_ctx *ctx;
|
||||
oz_event_log(OZ_EVT_SERVICE, 4, OZ_APPID_SERIAL, 0, pause);
|
||||
if (pause) {
|
||||
oz_trace("Serial service paused.\n");
|
||||
return;
|
||||
}
|
||||
spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
|
||||
ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
|
||||
pd->app_ctx[OZ_APPID_SERIAL-1] = 0;
|
||||
spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
|
||||
if (ctx)
|
||||
oz_cdev_release_ctx(ctx);
|
||||
spin_lock(&g_cdev.lock);
|
||||
if (pd == g_cdev.active_pd)
|
||||
g_cdev.active_pd = 0;
|
||||
else
|
||||
pd = 0;
|
||||
spin_unlock(&g_cdev.lock);
|
||||
if (pd) {
|
||||
oz_pd_put(pd);
|
||||
oz_trace("Active PD departed.\n");
|
||||
}
|
||||
oz_trace("Serial service stopped.\n");
|
||||
}
|
||||
/*------------------------------------------------------------------------------
|
||||
* Context: softirq-serialized
|
||||
*/
|
||||
void oz_cdev_rx(struct oz_pd *pd, struct oz_elt *elt)
|
||||
{
|
||||
struct oz_serial_ctx *ctx;
|
||||
struct oz_app_hdr *app_hdr;
|
||||
u8 *data;
|
||||
int len;
|
||||
int space;
|
||||
int copy_sz;
|
||||
int ix;
|
||||
|
||||
ctx = oz_cdev_claim_ctx(pd);
|
||||
if (ctx == 0) {
|
||||
oz_trace("Cannot claim serial context.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
app_hdr = (struct oz_app_hdr *)(elt+1);
|
||||
/* If sequence number is non-zero then check it is not a duplicate.
|
||||
*/
|
||||
if (app_hdr->elt_seq_num != 0) {
|
||||
if (((ctx->rx_seq_num - app_hdr->elt_seq_num) & 0x80) == 0) {
|
||||
/* Reject duplicate element. */
|
||||
oz_trace("Duplicate element:%02x %02x\n",
|
||||
app_hdr->elt_seq_num, ctx->rx_seq_num);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
ctx->rx_seq_num = app_hdr->elt_seq_num;
|
||||
len = elt->length - sizeof(struct oz_app_hdr);
|
||||
data = ((u8 *)(elt+1)) + sizeof(struct oz_app_hdr);
|
||||
if (len <= 0)
|
||||
goto out;
|
||||
space = ctx->rd_out - ctx->rd_in - 1;
|
||||
if (space < 0)
|
||||
space += OZ_RD_BUF_SZ;
|
||||
if (len > space) {
|
||||
oz_trace("Not enough space:%d %d\n", len, space);
|
||||
len = space;
|
||||
}
|
||||
ix = ctx->rd_in;
|
||||
copy_sz = OZ_RD_BUF_SZ - ix;
|
||||
if (copy_sz > len)
|
||||
copy_sz = len;
|
||||
memcpy(&ctx->rd_buf[ix], data, copy_sz);
|
||||
len -= copy_sz;
|
||||
ix += copy_sz;
|
||||
if (ix == OZ_RD_BUF_SZ)
|
||||
ix = 0;
|
||||
if (len) {
|
||||
memcpy(ctx->rd_buf, data+copy_sz, len);
|
||||
ix = len;
|
||||
}
|
||||
ctx->rd_in = ix;
|
||||
wake_up(&g_cdev.rdq);
|
||||
out:
|
||||
oz_cdev_release_ctx(ctx);
|
||||
}
|
||||
/*------------------------------------------------------------------------------
|
||||
* Context: softirq
|
||||
*/
|
||||
void oz_cdev_heartbeat(struct oz_pd *pd)
|
||||
{
|
||||
}
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
/* -----------------------------------------------------------------------------
|
||||
* Copyright (c) 2011 Ozmo Inc
|
||||
* Released under the GNU General Public License Version 2 (GPLv2).
|
||||
* -----------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef _OZCDEV_H
|
||||
#define _OZCDEV_H
|
||||
|
||||
int oz_cdev_register(void);
|
||||
int oz_cdev_deregister(void);
|
||||
int oz_cdev_init(void);
|
||||
void oz_cdev_term(void);
|
||||
int oz_cdev_start(struct oz_pd *pd, int resume);
|
||||
void oz_cdev_stop(struct oz_pd *pd, int pause);
|
||||
void oz_cdev_rx(struct oz_pd *pd, struct oz_elt *elt);
|
||||
void oz_cdev_heartbeat(struct oz_pd *pd);
|
||||
|
||||
#endif /* _OZCDEV_H */
|
||||
Loading…
Reference in New Issue