2 * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/tty.h>
19 #include <linux/tty_driver.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/usb/cdc.h>
24 #include <linux/serial.h>
27 #define GDM_TTY_MAJOR 0
28 #define GDM_TTY_MINOR 32
30 #define ACM_CTRL_DTR 0x01
31 #define ACM_CTRL_RTS 0x02
32 #define ACM_CTRL_DSR 0x02
33 #define ACM_CTRL_RI 0x08
34 #define ACM_CTRL_DCD 0x01
36 #define WRITE_SIZE 2048
38 #define MUX_TX_MAX_SIZE 2048
40 #define gdm_tty_send(n, d, l, i, c, b) (\
41 n->tty_dev->send_func(n->tty_dev->priv_dev, d, l, i, c, b))
42 #define gdm_tty_recv(n, c) (\
43 n->tty_dev->recv_func(n->tty_dev->priv_dev, c))
44 #define gdm_tty_send_control(n, r, v, d, l) (\
45 n->tty_dev->send_control(n->tty_dev->priv_dev, r, v, d, l))
47 #define GDM_TTY_READY(gdm) (gdm && gdm->tty_dev && gdm->port.count)
49 static struct tty_driver *gdm_driver[TTY_MAX_COUNT];
50 static struct gdm *gdm_table[TTY_MAX_COUNT][GDM_TTY_MINOR];
51 static DEFINE_MUTEX(gdm_table_lock);
53 static char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
54 static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};
56 static void gdm_port_destruct(struct tty_port *port)
58 struct gdm *gdm = container_of(port, struct gdm, port);
60 mutex_lock(&gdm_table_lock);
61 gdm_table[gdm->index][gdm->minor] = NULL;
62 mutex_unlock(&gdm_table_lock);
67 static const struct tty_port_operations gdm_port_ops = {
68 .destruct = gdm_port_destruct,
71 static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
73 struct gdm *gdm = NULL;
79 for (i = 0; i < TTY_MAX_COUNT; i++) {
80 if (!strcmp(tty->driver->driver_name, DRIVER_STRING[i])) {
86 if (j == GDM_TTY_MINOR)
89 mutex_lock(&gdm_table_lock);
90 gdm = gdm_table[i][j];
92 mutex_unlock(&gdm_table_lock);
96 tty_port_get(&gdm->port);
98 ret = tty_standard_install(driver, tty);
100 tty_port_put(&gdm->port);
101 mutex_unlock(&gdm_table_lock);
105 tty->driver_data = gdm;
106 mutex_unlock(&gdm_table_lock);
111 static int gdm_tty_open(struct tty_struct *tty, struct file *filp)
113 struct gdm *gdm = tty->driver_data;
115 return tty_port_open(&gdm->port, tty, filp);
118 static void gdm_tty_cleanup(struct tty_struct *tty)
120 struct gdm *gdm = tty->driver_data;
122 tty_port_put(&gdm->port);
125 static void gdm_tty_hangup(struct tty_struct *tty)
127 struct gdm *gdm = tty->driver_data;
129 tty_port_hangup(&gdm->port);
132 static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
134 struct gdm *gdm = tty->driver_data;
136 tty_port_close(&gdm->port, tty, filp);
139 static int gdm_tty_recv_complete(void *data,
142 struct tty_dev *tty_dev,
145 struct gdm *gdm = tty_dev->gdm[index];
147 if (!GDM_TTY_READY(gdm)) {
148 if (complete == RECV_PACKET_PROCESS_COMPLETE)
149 gdm_tty_recv(gdm, gdm_tty_recv_complete);
150 return TO_HOST_PORT_CLOSE;
154 if (tty_buffer_request_room(&gdm->port, len) == len) {
155 tty_insert_flip_string(&gdm->port, data, len);
156 tty_flip_buffer_push(&gdm->port);
158 return TO_HOST_BUFFER_REQUEST_FAIL;
162 if (complete == RECV_PACKET_PROCESS_COMPLETE)
163 gdm_tty_recv(gdm, gdm_tty_recv_complete);
168 static void gdm_tty_send_complete(void *arg)
170 struct gdm *gdm = arg;
172 if (!GDM_TTY_READY(gdm))
175 tty_port_tty_wakeup(&gdm->port);
178 static int gdm_tty_write(struct tty_struct *tty, const unsigned char *buf,
181 struct gdm *gdm = tty->driver_data;
186 if (!GDM_TTY_READY(gdm))
193 sending_len = remain > MUX_TX_MAX_SIZE ? MUX_TX_MAX_SIZE :
196 (void *)(buf + sent_len),
199 gdm_tty_send_complete,
202 sent_len += sending_len;
203 remain -= sending_len;
211 static int gdm_tty_write_room(struct tty_struct *tty)
213 struct gdm *gdm = tty->driver_data;
215 if (!GDM_TTY_READY(gdm))
221 int register_lte_tty_device(struct tty_dev *tty_dev, struct device *device)
227 for (i = 0; i < TTY_MAX_COUNT; i++) {
228 gdm = kmalloc(sizeof(*gdm), GFP_KERNEL);
232 mutex_lock(&gdm_table_lock);
233 for (j = 0; j < GDM_TTY_MINOR; j++) {
234 if (!gdm_table[i][j])
238 if (j == GDM_TTY_MINOR) {
240 mutex_unlock(&gdm_table_lock);
244 gdm_table[i][j] = gdm;
245 mutex_unlock(&gdm_table_lock);
247 tty_dev->gdm[i] = gdm;
248 tty_port_init(&gdm->port);
250 gdm->port.ops = &gdm_port_ops;
253 gdm->tty_dev = tty_dev;
255 tty_port_register_device(&gdm->port, gdm_driver[i],
259 for (i = 0; i < MAX_ISSUE_NUM; i++)
260 gdm_tty_recv(gdm, gdm_tty_recv_complete);
265 void unregister_lte_tty_device(struct tty_dev *tty_dev)
268 struct tty_struct *tty;
271 for (i = 0; i < TTY_MAX_COUNT; i++) {
272 gdm = tty_dev->gdm[i];
276 mutex_lock(&gdm_table_lock);
277 gdm_table[gdm->index][gdm->minor] = NULL;
278 mutex_unlock(&gdm_table_lock);
280 tty = tty_port_tty_get(&gdm->port);
286 tty_unregister_device(gdm_driver[i], gdm->minor);
287 tty_port_put(&gdm->port);
291 static const struct tty_operations gdm_tty_ops = {
292 .install = gdm_tty_install,
293 .open = gdm_tty_open,
294 .close = gdm_tty_close,
295 .cleanup = gdm_tty_cleanup,
296 .hangup = gdm_tty_hangup,
297 .write = gdm_tty_write,
298 .write_room = gdm_tty_write_room,
301 int register_lte_tty_driver(void)
303 struct tty_driver *tty_driver;
307 for (i = 0; i < TTY_MAX_COUNT; i++) {
308 tty_driver = alloc_tty_driver(GDM_TTY_MINOR);
312 tty_driver->owner = THIS_MODULE;
313 tty_driver->driver_name = DRIVER_STRING[i];
314 tty_driver->name = DEVICE_STRING[i];
315 tty_driver->major = GDM_TTY_MAJOR;
316 tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
317 tty_driver->subtype = SERIAL_TYPE_NORMAL;
318 tty_driver->flags = TTY_DRIVER_REAL_RAW |
319 TTY_DRIVER_DYNAMIC_DEV;
320 tty_driver->init_termios = tty_std_termios;
321 tty_driver->init_termios.c_cflag = B9600 | CS8 | HUPCL | CLOCAL;
322 tty_driver->init_termios.c_lflag = ISIG | ICANON | IEXTEN;
323 tty_set_operations(tty_driver, &gdm_tty_ops);
325 ret = tty_register_driver(tty_driver);
327 put_tty_driver(tty_driver);
331 gdm_driver[i] = tty_driver;
337 void unregister_lte_tty_driver(void)
339 struct tty_driver *tty_driver;
342 for (i = 0; i < TTY_MAX_COUNT; i++) {
343 tty_driver = gdm_driver[i];
345 tty_unregister_driver(tty_driver);
346 put_tty_driver(tty_driver);