Fixed MTP to work with TWRP

arch/um/drivers/slip_user.c

@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/termios.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include "slip.h"
+#include <um_malloc.h>
+
+static int slip_user_init(void *data, void *dev)
+{
+	struct slip_data *pri = data;
+
+	pri->dev = dev;
+	return 0;
+}
+
+static int set_up_tty(int fd)
+{
+	int i;
+	struct termios tios;
+
+	if (tcgetattr(fd, &tios) < 0) {
+		printk(UM_KERN_ERR "could not get initial terminal "
+		       "attributes\n");
+		return -1;
+	}
+
+	tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
+	tios.c_iflag = IGNBRK | IGNPAR;
+	tios.c_oflag = 0;
+	tios.c_lflag = 0;
+	for (i = 0; i < NCCS; i++)
+		tios.c_cc[i] = 0;
+	tios.c_cc[VMIN] = 1;
+	tios.c_cc[VTIME] = 0;
+
+	cfsetospeed(&tios, B38400);
+	cfsetispeed(&tios, B38400);
+
+	if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+		printk(UM_KERN_ERR "failed to set terminal attributes\n");
+		return -1;
+	}
+	return 0;
+}
+
+struct slip_pre_exec_data {
+	int stdin;
+	int stdout;
+	int close_me;
+};
+
+static void slip_pre_exec(void *arg)
+{
+	struct slip_pre_exec_data *data = arg;
+
+	if (data->stdin >= 0)
+		dup2(data->stdin, 0);
+	dup2(data->stdout, 1);
+	if (data->close_me >= 0)
+		close(data->close_me);
+}
+
+static int slip_tramp(char **argv, int fd)
+{
+	struct slip_pre_exec_data pe_data;
+	char *output;
+	int pid, fds[2], err, output_len;
+
+	err = os_pipe(fds, 1, 0);
+	if (err < 0) {
+		printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
+		       -err);
+		goto out;
+	}
+
+	err = 0;
+	pe_data.stdin = fd;
+	pe_data.stdout = fds[1];
+	pe_data.close_me = fds[0];
+	err = run_helper(slip_pre_exec, &pe_data, argv);
+	if (err < 0)
+		goto out_close;
+	pid = err;
+
+	output_len = UM_KERN_PAGE_SIZE;
+	output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+	if (output == NULL) {
+		printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
+		       "buffer\n");
+		os_kill_process(pid, 1);
+		err = -ENOMEM;
+		goto out_close;
+	}
+
+	close(fds[1]);
+	read_output(fds[0], output, output_len);
+	printk("%s", output);
+
+	err = helper_wait(pid);
+	close(fds[0]);
+
+	kfree(output);
+	return err;
+
+out_close:
+	close(fds[0]);
+	close(fds[1]);
+out:
+	return err;
+}
+
+static int slip_open(void *data)
+{
+	struct slip_data *pri = data;
+	char version_buf[sizeof("nnnnn\0")];
+	char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+	char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
+			 NULL };
+	int sfd, mfd, err;
+
+	err = get_pty();
+	if (err < 0) {
+		printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
+		       -err);
+		goto out;
+	}
+	mfd = err;
+
+	err = open(ptsname(mfd), O_RDWR, 0);
+	if (err < 0) {
+		printk(UM_KERN_ERR "Couldn't open tty for slip line, "
+		       "err = %d\n", -err);
+		goto out_close;
+	}
+	sfd = err;
+
+	if (set_up_tty(sfd))
+		goto out_close2;
+
+	pri->slave = sfd;
+	pri->slip.pos = 0;
+	pri->slip.esc = 0;
+	if (pri->gate_addr != NULL) {
+		sprintf(version_buf, "%d", UML_NET_VERSION);
+		strcpy(gate_buf, pri->gate_addr);
+
+		err = slip_tramp(argv, sfd);
+
+		if (err < 0) {
+			printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
+			       -err);
+			goto out_close2;
+		}
+		err = os_get_ifname(pri->slave, pri->name);
+		if (err < 0) {
+			printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
+			       -err);
+			goto out_close2;
+		}
+		iter_addresses(pri->dev, open_addr, pri->name);
+	}
+	else {
+		err = os_set_slip(sfd);
+		if (err < 0) {
+			printk(UM_KERN_ERR "Failed to set slip discipline "
+			       "encapsulation - err = %d\n", -err);
+			goto out_close2;
+		}
+	}
+	return mfd;
+out_close2:
+	close(sfd);
+out_close:
+	close(mfd);
+out:
+	return err;
+}
+
+static void slip_close(int fd, void *data)
+{
+	struct slip_data *pri = data;
+	char version_buf[sizeof("nnnnn\0")];
+	char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
+			 NULL };
+	int err;
+
+	if (pri->gate_addr != NULL)
+		iter_addresses(pri->dev, close_addr, pri->name);
+
+	sprintf(version_buf, "%d", UML_NET_VERSION);
+
+	err = slip_tramp(argv, pri->slave);
+
+	if (err != 0)
+		printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
+	close(fd);
+	close(pri->slave);
+	pri->slave = -1;
+}
+
+int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
+{
+	return slip_proto_read(fd, buf, len, &pri->slip);
+}
+
+int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
+{
+	return slip_proto_write(fd, buf, len, &pri->slip);
+}
+
+static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
+			  void *data)
+{
+	struct slip_data *pri = data;
+
+	if (pri->slave < 0)
+		return;
+	open_addr(addr, netmask, pri->name);
+}
+
+static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct slip_data *pri = data;
+
+	if (pri->slave < 0)
+		return;
+	close_addr(addr, netmask, pri->name);
+}
+
+const struct net_user_info slip_user_info = {
+	.init		= slip_user_init,
+	.open		= slip_open,
+	.close	 	= slip_close,
+	.remove	 	= NULL,
+	.add_address	= slip_add_addr,
+	.delete_address = slip_del_addr,
+	.mtu		= BUF_SIZE,
+	.max_packet	= BUF_SIZE,
+};