1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6 #include <linux/kernel.h>
7 #include <linux/errno.h>
9 #include <linux/tty_driver.h>
10 #include <linux/tty_flip.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/usb/cdc.h>
14 #include <linux/serial.h>
17 #define GDM_TTY_MAJOR 0
18 #define GDM_TTY_MINOR 32
20 #define ACM_CTRL_DTR 0x01
21 #define ACM_CTRL_RTS 0x02
22 #define ACM_CTRL_DSR 0x02
23 #define ACM_CTRL_RI 0x08
24 #define ACM_CTRL_DCD 0x01
26 #define WRITE_SIZE 2048
28 #define MUX_TX_MAX_SIZE 2048
30 #define GDM_TTY_READY(gdm) (gdm && gdm->tty_dev && gdm->port.count)
32 static struct tty_driver *gdm_driver[TTY_MAX_COUNT];
33 static struct gdm *gdm_table[TTY_MAX_COUNT][GDM_TTY_MINOR];
34 static DEFINE_MUTEX(gdm_table_lock);
36 static const char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
37 static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};
39 static void gdm_port_destruct(struct tty_port *port)
41 struct gdm *gdm = container_of(port, struct gdm, port);
43 mutex_lock(&gdm_table_lock);
44 gdm_table[gdm->index][gdm->minor] = NULL;
45 mutex_unlock(&gdm_table_lock);
50 static const struct tty_port_operations gdm_port_ops = {
51 .destruct = gdm_port_destruct,
54 static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
56 struct gdm *gdm = NULL;
59 ret = match_string(DRIVER_STRING, TTY_MAX_COUNT,
60 tty->driver->driver_name);
64 mutex_lock(&gdm_table_lock);
65 gdm = gdm_table[ret][tty->index];
67 mutex_unlock(&gdm_table_lock);
71 tty_port_get(&gdm->port);
73 ret = tty_standard_install(driver, tty);
75 tty_port_put(&gdm->port);
76 mutex_unlock(&gdm_table_lock);
80 tty->driver_data = gdm;
81 mutex_unlock(&gdm_table_lock);
86 static int gdm_tty_open(struct tty_struct *tty, struct file *filp)
88 struct gdm *gdm = tty->driver_data;
90 return tty_port_open(&gdm->port, tty, filp);
93 static void gdm_tty_cleanup(struct tty_struct *tty)
95 struct gdm *gdm = tty->driver_data;
97 tty_port_put(&gdm->port);
100 static void gdm_tty_hangup(struct tty_struct *tty)
102 struct gdm *gdm = tty->driver_data;
104 tty_port_hangup(&gdm->port);
107 static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
109 struct gdm *gdm = tty->driver_data;
111 tty_port_close(&gdm->port, tty, filp);
114 static int gdm_tty_recv_complete(void *data,
117 struct tty_dev *tty_dev,
120 struct gdm *gdm = tty_dev->gdm[index];
122 if (!GDM_TTY_READY(gdm)) {
123 if (complete == RECV_PACKET_PROCESS_COMPLETE)
124 gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
125 gdm_tty_recv_complete);
126 return TO_HOST_PORT_CLOSE;
130 if (tty_buffer_request_room(&gdm->port, len) == len) {
131 tty_insert_flip_string(&gdm->port, data, len);
132 tty_flip_buffer_push(&gdm->port);
134 return TO_HOST_BUFFER_REQUEST_FAIL;
138 if (complete == RECV_PACKET_PROCESS_COMPLETE)
139 gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
140 gdm_tty_recv_complete);
145 static void gdm_tty_send_complete(void *arg)
147 struct gdm *gdm = arg;
149 if (!GDM_TTY_READY(gdm))
152 tty_port_tty_wakeup(&gdm->port);
155 static int gdm_tty_write(struct tty_struct *tty, const unsigned char *buf,
158 struct gdm *gdm = tty->driver_data;
163 if (!GDM_TTY_READY(gdm))
170 sending_len = min(MUX_TX_MAX_SIZE, remain);
171 gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
172 (void *)(buf + sent_len),
175 gdm_tty_send_complete,
177 sent_len += sending_len;
178 remain -= sending_len;
186 static unsigned int gdm_tty_write_room(struct tty_struct *tty)
188 struct gdm *gdm = tty->driver_data;
190 if (!GDM_TTY_READY(gdm))
196 int register_lte_tty_device(struct tty_dev *tty_dev, struct device *device)
202 for (i = 0; i < TTY_MAX_COUNT; i++) {
203 gdm = kmalloc(sizeof(*gdm), GFP_KERNEL);
207 mutex_lock(&gdm_table_lock);
208 for (j = 0; j < GDM_TTY_MINOR; j++) {
209 if (!gdm_table[i][j])
213 if (j == GDM_TTY_MINOR) {
215 mutex_unlock(&gdm_table_lock);
219 gdm_table[i][j] = gdm;
220 mutex_unlock(&gdm_table_lock);
222 tty_dev->gdm[i] = gdm;
223 tty_port_init(&gdm->port);
225 gdm->port.ops = &gdm_port_ops;
228 gdm->tty_dev = tty_dev;
230 tty_port_register_device(&gdm->port, gdm_driver[i],
234 for (i = 0; i < MAX_ISSUE_NUM; i++)
235 gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
236 gdm_tty_recv_complete);
241 void unregister_lte_tty_device(struct tty_dev *tty_dev)
244 struct tty_struct *tty;
247 for (i = 0; i < TTY_MAX_COUNT; i++) {
248 gdm = tty_dev->gdm[i];
252 mutex_lock(&gdm_table_lock);
253 gdm_table[gdm->index][gdm->minor] = NULL;
254 mutex_unlock(&gdm_table_lock);
256 tty = tty_port_tty_get(&gdm->port);
262 tty_unregister_device(gdm_driver[i], gdm->minor);
263 tty_port_put(&gdm->port);
267 static const struct tty_operations gdm_tty_ops = {
268 .install = gdm_tty_install,
269 .open = gdm_tty_open,
270 .close = gdm_tty_close,
271 .cleanup = gdm_tty_cleanup,
272 .hangup = gdm_tty_hangup,
273 .write = gdm_tty_write,
274 .write_room = gdm_tty_write_room,
277 int register_lte_tty_driver(void)
279 struct tty_driver *tty_driver;
283 for (i = 0; i < TTY_MAX_COUNT; i++) {
284 tty_driver = alloc_tty_driver(GDM_TTY_MINOR);
288 tty_driver->owner = THIS_MODULE;
289 tty_driver->driver_name = DRIVER_STRING[i];
290 tty_driver->name = DEVICE_STRING[i];
291 tty_driver->major = GDM_TTY_MAJOR;
292 tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
293 tty_driver->subtype = SERIAL_TYPE_NORMAL;
294 tty_driver->flags = TTY_DRIVER_REAL_RAW |
295 TTY_DRIVER_DYNAMIC_DEV;
296 tty_driver->init_termios = tty_std_termios;
297 tty_driver->init_termios.c_cflag = B9600 | CS8 | HUPCL | CLOCAL;
298 tty_driver->init_termios.c_lflag = ISIG | ICANON | IEXTEN;
299 tty_set_operations(tty_driver, &gdm_tty_ops);
301 ret = tty_register_driver(tty_driver);
303 put_tty_driver(tty_driver);
307 gdm_driver[i] = tty_driver;
313 void unregister_lte_tty_driver(void)
315 struct tty_driver *tty_driver;
318 for (i = 0; i < TTY_MAX_COUNT; i++) {
319 tty_driver = gdm_driver[i];
321 tty_unregister_driver(tty_driver);
322 put_tty_driver(tty_driver);