Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 1 | /* |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 2 | * UART driver for the Greybus "generic" UART module. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 3 | * |
| 4 | * Copyright 2014 Google Inc. |
Alex Elder | a46e967 | 2014-12-12 12:08:42 -0600 | [diff] [blame] | 5 | * Copyright 2014 Linaro Ltd. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 6 | * |
| 7 | * Released under the GPLv2 only. |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 8 | * |
| 9 | * Heavily based on drivers/usb/class/cdc-acm.c and |
| 10 | * drivers/usb/serial/usb-serial.c. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 11 | */ |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 13 | |
| 14 | #include <linux/kernel.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 15 | #include <linux/errno.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 16 | #include <linux/module.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 17 | #include <linux/sched.h> |
| 18 | #include <linux/wait.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 19 | #include <linux/slab.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
| 21 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 22 | #include <linux/tty.h> |
| 23 | #include <linux/serial.h> |
| 24 | #include <linux/tty_driver.h> |
| 25 | #include <linux/tty_flip.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 26 | #include <linux/serial.h> |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 27 | #include <linux/idr.h> |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 28 | #include <linux/fs.h> |
| 29 | #include <linux/kdev_t.h> |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 30 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 31 | #include "greybus.h" |
| 32 | |
Bryan O'Donoghue | f5537d4 | 2015-06-02 13:40:46 +0100 | [diff] [blame] | 33 | #define GB_NUM_MINORS 16 /* 16 is is more than enough */ |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 34 | #define GB_NAME "ttyGB" |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 35 | |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 36 | struct gb_tty_line_coding { |
| 37 | __le32 rate; |
| 38 | __u8 format; |
| 39 | __u8 parity; |
| 40 | __u8 data_bits; |
| 41 | }; |
| 42 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 43 | struct gb_tty { |
| 44 | struct tty_port port; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 45 | void *buffer; |
| 46 | u32 buffer_payload_max; |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 47 | struct gb_connection *connection; |
Alex Elder | 1cfc667 | 2014-09-30 19:25:21 -0500 | [diff] [blame] | 48 | u16 cport_id; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 49 | unsigned int minor; |
| 50 | unsigned char clocal; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 51 | bool disconnected; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 52 | spinlock_t read_lock; |
| 53 | spinlock_t write_lock; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 54 | struct async_icount iocount; |
| 55 | struct async_icount oldcount; |
| 56 | wait_queue_head_t wioctl; |
| 57 | struct mutex mutex; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 58 | u8 version_major; |
| 59 | u8 version_minor; |
| 60 | unsigned int ctrlin; /* input control lines */ |
| 61 | unsigned int ctrlout; /* output control lines */ |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 62 | struct gb_tty_line_coding line_coding; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 63 | }; |
| 64 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 65 | static struct tty_driver *gb_tty_driver; |
| 66 | static DEFINE_IDR(tty_minors); |
| 67 | static DEFINE_MUTEX(table_lock); |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 68 | static atomic_t reference_count = ATOMIC_INIT(0); |
| 69 | |
Viresh Kumar | 36e79de | 2015-01-21 18:12:36 +0530 | [diff] [blame] | 70 | /* Define get_version() routine */ |
| 71 | define_get_version(gb_tty, UART); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 72 | |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame^] | 73 | static int gb_uart_request_recv(u8 type, struct gb_operation *op) |
| 74 | { |
| 75 | struct gb_connection *connection = op->connection; |
| 76 | struct gb_tty *gb_tty = connection->private; |
| 77 | struct gb_message *request = op->request; |
| 78 | struct gb_uart_recv_data_request *receive_data; |
| 79 | struct gb_uart_serial_state_request *serial_state; |
| 80 | struct tty_port *port = &gb_tty->port; |
| 81 | int count; |
| 82 | int ret = 0; |
| 83 | |
| 84 | switch (type) { |
| 85 | case GB_UART_TYPE_RECEIVE_DATA: |
| 86 | receive_data = request->payload; |
| 87 | count = gb_tty->buffer_payload_max - sizeof(*receive_data); |
| 88 | if (!receive_data->size || receive_data->size > count) |
| 89 | return -EINVAL; |
| 90 | |
| 91 | count = tty_insert_flip_string(port, receive_data->data, |
| 92 | receive_data->size); |
| 93 | if (count != receive_data->size) { |
| 94 | dev_err(&connection->dev, |
| 95 | "UART: RX 0x%08x bytes only wrote 0x%08x\n", |
| 96 | receive_data->size, count); |
| 97 | } |
| 98 | if (count) |
| 99 | tty_flip_buffer_push(port); |
| 100 | break; |
| 101 | case GB_UART_TYPE_SERIAL_STATE: |
| 102 | serial_state = request->payload; |
| 103 | /* TODO: Parse state change and translate to tty API. */ |
| 104 | break; |
| 105 | default: |
| 106 | dev_err(&connection->dev, |
| 107 | "unsupported unsolicited request: %02x\n", type); |
| 108 | ret = -EINVAL; |
| 109 | } |
| 110 | |
| 111 | return ret; |
| 112 | } |
| 113 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 114 | static int send_data(struct gb_tty *tty, u16 size, const u8 *data) |
| 115 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 116 | struct gb_uart_send_data_request *request; |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 117 | int ret; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 118 | |
| 119 | if (!data || !size) |
| 120 | return 0; |
| 121 | |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 122 | if (size > tty->buffer_payload_max) |
| 123 | size = tty->buffer_payload_max; |
| 124 | request = tty->buffer; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 125 | request->size = cpu_to_le16(size); |
| 126 | memcpy(&request->data[0], data, size); |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 127 | ret = gb_operation_sync(tty->connection, GB_UART_TYPE_SEND_DATA, |
| 128 | request, sizeof(*request) + size, NULL, 0); |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 129 | if (ret) |
| 130 | return ret; |
| 131 | else |
| 132 | return size; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 133 | } |
| 134 | |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 135 | static int send_line_coding(struct gb_tty *tty) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 136 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 137 | struct gb_uart_set_line_coding_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 138 | |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 139 | memcpy(&request, &tty->line_coding, |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 140 | sizeof(tty->line_coding)); |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 141 | return gb_operation_sync(tty->connection, GB_UART_TYPE_SET_LINE_CODING, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 142 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | static int send_control(struct gb_tty *tty, u16 control) |
| 146 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 147 | struct gb_uart_set_control_line_state_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 148 | |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 149 | request.control = cpu_to_le16(control); |
| 150 | return gb_operation_sync(tty->connection, |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 151 | GB_UART_TYPE_SET_CONTROL_LINE_STATE, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 152 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | static int send_break(struct gb_tty *tty, u8 state) |
| 156 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 157 | struct gb_uart_set_break_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 158 | |
| 159 | if ((state != 0) && (state != 1)) { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 160 | dev_err(&tty->connection->dev, |
| 161 | "invalid break state of %d\n", state); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 162 | return -EINVAL; |
| 163 | } |
| 164 | |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 165 | request.state = state; |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 166 | return gb_operation_sync(tty->connection, GB_UART_TYPE_SET_BREAK, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 167 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 168 | } |
| 169 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 170 | |
| 171 | static struct gb_tty *get_gb_by_minor(unsigned minor) |
| 172 | { |
| 173 | struct gb_tty *gb_tty; |
| 174 | |
| 175 | mutex_lock(&table_lock); |
| 176 | gb_tty = idr_find(&tty_minors, minor); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 177 | if (gb_tty) { |
| 178 | mutex_lock(&gb_tty->mutex); |
| 179 | if (gb_tty->disconnected) { |
| 180 | mutex_unlock(&gb_tty->mutex); |
| 181 | gb_tty = NULL; |
| 182 | } else { |
| 183 | tty_port_get(&gb_tty->port); |
| 184 | mutex_unlock(&gb_tty->mutex); |
| 185 | } |
| 186 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 187 | mutex_unlock(&table_lock); |
| 188 | return gb_tty; |
| 189 | } |
| 190 | |
| 191 | static int alloc_minor(struct gb_tty *gb_tty) |
| 192 | { |
| 193 | int minor; |
| 194 | |
| 195 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 196 | minor = idr_alloc(&tty_minors, gb_tty, 0, GB_NUM_MINORS, GFP_KERNEL); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 197 | mutex_unlock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 198 | if (minor >= 0) |
| 199 | gb_tty->minor = minor; |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 200 | return minor; |
| 201 | } |
| 202 | |
| 203 | static void release_minor(struct gb_tty *gb_tty) |
| 204 | { |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 205 | int minor = gb_tty->minor; |
| 206 | |
| 207 | gb_tty->minor = 0; /* Maybe should use an invalid value instead */ |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 208 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 209 | idr_remove(&tty_minors, minor); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 210 | mutex_unlock(&table_lock); |
| 211 | } |
| 212 | |
| 213 | static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 214 | { |
| 215 | struct gb_tty *gb_tty; |
| 216 | int retval; |
| 217 | |
| 218 | gb_tty = get_gb_by_minor(tty->index); |
| 219 | if (!gb_tty) |
| 220 | return -ENODEV; |
| 221 | |
| 222 | retval = tty_standard_install(driver, tty); |
| 223 | if (retval) |
| 224 | goto error; |
| 225 | |
| 226 | tty->driver_data = gb_tty; |
| 227 | return 0; |
| 228 | error: |
| 229 | tty_port_put(&gb_tty->port); |
| 230 | return retval; |
| 231 | } |
| 232 | |
| 233 | static int gb_tty_open(struct tty_struct *tty, struct file *file) |
| 234 | { |
| 235 | struct gb_tty *gb_tty = tty->driver_data; |
| 236 | |
| 237 | return tty_port_open(&gb_tty->port, tty, file); |
| 238 | } |
| 239 | |
| 240 | static void gb_tty_close(struct tty_struct *tty, struct file *file) |
| 241 | { |
| 242 | struct gb_tty *gb_tty = tty->driver_data; |
| 243 | |
| 244 | tty_port_close(&gb_tty->port, tty, file); |
| 245 | } |
| 246 | |
| 247 | static void gb_tty_cleanup(struct tty_struct *tty) |
| 248 | { |
| 249 | struct gb_tty *gb_tty = tty->driver_data; |
| 250 | |
| 251 | tty_port_put(&gb_tty->port); |
| 252 | } |
| 253 | |
| 254 | static void gb_tty_hangup(struct tty_struct *tty) |
| 255 | { |
| 256 | struct gb_tty *gb_tty = tty->driver_data; |
| 257 | |
| 258 | tty_port_hangup(&gb_tty->port); |
| 259 | } |
| 260 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 261 | static int gb_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| 262 | int count) |
| 263 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 264 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 265 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 266 | return send_data(gb_tty, count, buf); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static int gb_tty_write_room(struct tty_struct *tty) |
| 270 | { |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 271 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 272 | |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 273 | return gb_tty->buffer_payload_max; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | static int gb_tty_chars_in_buffer(struct tty_struct *tty) |
| 277 | { |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 278 | return 0; |
| 279 | } |
| 280 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 281 | static int gb_tty_break_ctl(struct tty_struct *tty, int state) |
| 282 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 283 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 284 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 285 | return send_break(gb_tty, state ? 1 : 0); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 286 | } |
| 287 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 288 | static void gb_tty_set_termios(struct tty_struct *tty, |
| 289 | struct ktermios *termios_old) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 290 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 291 | struct gb_tty *gb_tty = tty->driver_data; |
| 292 | struct ktermios *termios = &tty->termios; |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 293 | struct gb_tty_line_coding newline; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 294 | int newctrl = gb_tty->ctrlout; |
| 295 | |
| 296 | newline.rate = cpu_to_le32(tty_get_baud_rate(tty)); |
| 297 | newline.format = termios->c_cflag & CSTOPB ? 2 : 0; |
| 298 | newline.parity = termios->c_cflag & PARENB ? |
| 299 | (termios->c_cflag & PARODD ? 1 : 2) + |
| 300 | (termios->c_cflag & CMSPAR ? 2 : 0) : 0; |
| 301 | |
| 302 | switch (termios->c_cflag & CSIZE) { |
| 303 | case CS5: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 304 | newline.data_bits = 5; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 305 | break; |
| 306 | case CS6: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 307 | newline.data_bits = 6; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 308 | break; |
| 309 | case CS7: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 310 | newline.data_bits = 7; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 311 | break; |
| 312 | case CS8: |
| 313 | default: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 314 | newline.data_bits = 8; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 315 | break; |
| 316 | } |
| 317 | |
| 318 | /* FIXME: needs to clear unsupported bits in the termios */ |
| 319 | gb_tty->clocal = ((termios->c_cflag & CLOCAL) != 0); |
| 320 | |
| 321 | if (C_BAUD(tty) == B0) { |
| 322 | newline.rate = gb_tty->line_coding.rate; |
| 323 | newctrl &= GB_UART_CTRL_DTR; |
| 324 | } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) { |
| 325 | newctrl |= GB_UART_CTRL_DTR; |
| 326 | } |
| 327 | |
| 328 | if (newctrl != gb_tty->ctrlout) { |
| 329 | gb_tty->ctrlout = newctrl; |
| 330 | send_control(gb_tty, newctrl); |
| 331 | } |
| 332 | |
| 333 | if (memcpy(&gb_tty->line_coding, &newline, sizeof(newline))) { |
| 334 | memcpy(&gb_tty->line_coding, &newline, sizeof(newline)); |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 335 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 336 | } |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static int gb_tty_tiocmget(struct tty_struct *tty) |
| 340 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 341 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 342 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 343 | return (gb_tty->ctrlout & GB_UART_CTRL_DTR ? TIOCM_DTR : 0) | |
| 344 | (gb_tty->ctrlout & GB_UART_CTRL_RTS ? TIOCM_RTS : 0) | |
| 345 | (gb_tty->ctrlin & GB_UART_CTRL_DSR ? TIOCM_DSR : 0) | |
| 346 | (gb_tty->ctrlin & GB_UART_CTRL_RI ? TIOCM_RI : 0) | |
| 347 | (gb_tty->ctrlin & GB_UART_CTRL_DCD ? TIOCM_CD : 0) | |
| 348 | TIOCM_CTS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | static int gb_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| 352 | unsigned int clear) |
| 353 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 354 | struct gb_tty *gb_tty = tty->driver_data; |
| 355 | unsigned int newctrl = gb_tty->ctrlout; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 356 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 357 | set = (set & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 358 | (set & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 359 | clear = (clear & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 360 | (clear & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 361 | |
| 362 | newctrl = (newctrl & ~clear) | set; |
| 363 | if (gb_tty->ctrlout == newctrl) |
| 364 | return 0; |
| 365 | |
| 366 | gb_tty->ctrlout = newctrl; |
| 367 | return send_control(gb_tty, newctrl); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 368 | } |
| 369 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 370 | static void gb_tty_throttle(struct tty_struct *tty) |
| 371 | { |
| 372 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 373 | unsigned char stop_char; |
| 374 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 375 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 376 | if (I_IXOFF(tty)) { |
| 377 | stop_char = STOP_CHAR(tty); |
| 378 | retval = gb_tty_write(tty, &stop_char, 1); |
| 379 | if (retval <= 0) |
| 380 | return; |
| 381 | } |
| 382 | |
| 383 | if (tty->termios.c_cflag & CRTSCTS) { |
| 384 | gb_tty->ctrlout &= ~GB_UART_CTRL_RTS; |
| 385 | retval = send_control(gb_tty, gb_tty->ctrlout); |
| 386 | } |
| 387 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | static void gb_tty_unthrottle(struct tty_struct *tty) |
| 391 | { |
| 392 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 393 | unsigned char start_char; |
| 394 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 395 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 396 | if (I_IXOFF(tty)) { |
| 397 | start_char = START_CHAR(tty); |
| 398 | retval = gb_tty_write(tty, &start_char, 1); |
| 399 | if (retval <= 0) |
| 400 | return; |
| 401 | } |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 402 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 403 | if (tty->termios.c_cflag & CRTSCTS) { |
| 404 | gb_tty->ctrlout |= GB_UART_CTRL_RTS; |
| 405 | retval = send_control(gb_tty, gb_tty->ctrlout); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 406 | } |
| 407 | } |
| 408 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 409 | static int get_serial_info(struct gb_tty *gb_tty, |
| 410 | struct serial_struct __user *info) |
| 411 | { |
| 412 | struct serial_struct tmp; |
| 413 | |
| 414 | if (!info) |
| 415 | return -EINVAL; |
| 416 | |
| 417 | memset(&tmp, 0, sizeof(tmp)); |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 418 | tmp.flags = ASYNC_LOW_LATENCY | ASYNC_SKIP_TEST; |
| 419 | tmp.type = PORT_16550A; |
| 420 | tmp.line = gb_tty->minor; |
| 421 | tmp.xmit_fifo_size = 16; |
| 422 | tmp.baud_base = 9600; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 423 | tmp.close_delay = gb_tty->port.close_delay / 10; |
| 424 | tmp.closing_wait = gb_tty->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 425 | ASYNC_CLOSING_WAIT_NONE : gb_tty->port.closing_wait / 10; |
| 426 | |
| 427 | if (copy_to_user(info, &tmp, sizeof(tmp))) |
| 428 | return -EFAULT; |
Greg Kroah-Hartman | 3be03d4 | 2014-09-01 19:10:06 -0700 | [diff] [blame] | 429 | return 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | static int set_serial_info(struct gb_tty *gb_tty, |
| 433 | struct serial_struct __user *newinfo) |
| 434 | { |
| 435 | struct serial_struct new_serial; |
| 436 | unsigned int closing_wait; |
| 437 | unsigned int close_delay; |
Alex Elder | 69f93ab | 2014-09-22 18:53:02 -0500 | [diff] [blame] | 438 | int retval = 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 439 | |
| 440 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 441 | return -EFAULT; |
| 442 | |
| 443 | close_delay = new_serial.close_delay * 10; |
| 444 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 445 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
| 446 | |
| 447 | mutex_lock(&gb_tty->port.mutex); |
| 448 | if (!capable(CAP_SYS_ADMIN)) { |
| 449 | if ((close_delay != gb_tty->port.close_delay) || |
| 450 | (closing_wait != gb_tty->port.closing_wait)) |
| 451 | retval = -EPERM; |
| 452 | else |
| 453 | retval = -EOPNOTSUPP; |
| 454 | } else { |
| 455 | gb_tty->port.close_delay = close_delay; |
| 456 | gb_tty->port.closing_wait = closing_wait; |
| 457 | } |
| 458 | mutex_unlock(&gb_tty->port.mutex); |
| 459 | return retval; |
| 460 | } |
| 461 | |
| 462 | static int wait_serial_change(struct gb_tty *gb_tty, unsigned long arg) |
| 463 | { |
| 464 | int retval = 0; |
| 465 | DECLARE_WAITQUEUE(wait, current); |
| 466 | struct async_icount old; |
| 467 | struct async_icount new; |
| 468 | |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 469 | if (!(arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 470 | return -EINVAL; |
| 471 | |
| 472 | do { |
| 473 | spin_lock_irq(&gb_tty->read_lock); |
| 474 | old = gb_tty->oldcount; |
| 475 | new = gb_tty->iocount; |
| 476 | gb_tty->oldcount = new; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 477 | spin_unlock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 478 | |
| 479 | if ((arg & TIOCM_DSR) && (old.dsr != new.dsr)) |
| 480 | break; |
| 481 | if ((arg & TIOCM_CD) && (old.dcd != new.dcd)) |
| 482 | break; |
| 483 | if ((arg & TIOCM_RI) && (old.rng != new.rng)) |
| 484 | break; |
| 485 | |
| 486 | add_wait_queue(&gb_tty->wioctl, &wait); |
| 487 | set_current_state(TASK_INTERRUPTIBLE); |
| 488 | schedule(); |
| 489 | remove_wait_queue(&gb_tty->wioctl, &wait); |
| 490 | if (gb_tty->disconnected) { |
| 491 | if (arg & TIOCM_CD) |
| 492 | break; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 493 | retval = -ENODEV; |
| 494 | } else if (signal_pending(current)) { |
| 495 | retval = -ERESTARTSYS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 496 | } |
| 497 | } while (!retval); |
| 498 | |
| 499 | return retval; |
| 500 | } |
| 501 | |
| 502 | static int get_serial_usage(struct gb_tty *gb_tty, |
| 503 | struct serial_icounter_struct __user *count) |
| 504 | { |
| 505 | struct serial_icounter_struct icount; |
| 506 | int retval = 0; |
| 507 | |
| 508 | memset(&icount, 0, sizeof(icount)); |
| 509 | icount.dsr = gb_tty->iocount.dsr; |
| 510 | icount.rng = gb_tty->iocount.rng; |
| 511 | icount.dcd = gb_tty->iocount.dcd; |
| 512 | icount.frame = gb_tty->iocount.frame; |
| 513 | icount.overrun = gb_tty->iocount.overrun; |
| 514 | icount.parity = gb_tty->iocount.parity; |
| 515 | icount.brk = gb_tty->iocount.brk; |
| 516 | |
| 517 | if (copy_to_user(count, &icount, sizeof(icount)) > 0) |
| 518 | retval = -EFAULT; |
| 519 | |
| 520 | return retval; |
| 521 | } |
| 522 | |
| 523 | static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 524 | unsigned long arg) |
| 525 | { |
| 526 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 527 | |
| 528 | switch (cmd) { |
| 529 | case TIOCGSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 530 | return get_serial_info(gb_tty, |
| 531 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 532 | case TIOCSSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 533 | return set_serial_info(gb_tty, |
| 534 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 535 | case TIOCMIWAIT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 536 | return wait_serial_change(gb_tty, arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 537 | case TIOCGICOUNT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 538 | return get_serial_usage(gb_tty, |
| 539 | (struct serial_icounter_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 540 | } |
| 541 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 542 | return -ENOIOCTLCMD; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 543 | } |
| 544 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 545 | |
| 546 | static const struct tty_operations gb_ops = { |
| 547 | .install = gb_tty_install, |
| 548 | .open = gb_tty_open, |
| 549 | .close = gb_tty_close, |
| 550 | .cleanup = gb_tty_cleanup, |
| 551 | .hangup = gb_tty_hangup, |
| 552 | .write = gb_tty_write, |
| 553 | .write_room = gb_tty_write_room, |
| 554 | .ioctl = gb_tty_ioctl, |
| 555 | .throttle = gb_tty_throttle, |
| 556 | .unthrottle = gb_tty_unthrottle, |
| 557 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 558 | .break_ctl = gb_tty_break_ctl, |
| 559 | .set_termios = gb_tty_set_termios, |
| 560 | .tiocmget = gb_tty_tiocmget, |
| 561 | .tiocmset = gb_tty_tiocmset, |
| 562 | }; |
| 563 | |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 564 | static struct tty_port_operations null_ops = { }; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 565 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 566 | static int gb_tty_init(void); |
| 567 | static void gb_tty_exit(void); |
| 568 | |
Greg Kroah-Hartman | 059b093 | 2014-10-28 09:49:33 +0800 | [diff] [blame] | 569 | static int gb_uart_connection_init(struct gb_connection *connection) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 570 | { |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 571 | struct gb_tty *gb_tty; |
| 572 | struct device *tty_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 573 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 574 | int minor; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 575 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 576 | /* First time here, initialize the tty structures */ |
| 577 | if (atomic_inc_return(&reference_count) == 1) { |
| 578 | retval = gb_tty_init(); |
| 579 | if (retval) { |
| 580 | atomic_dec(&reference_count); |
| 581 | return retval; |
| 582 | } |
| 583 | } |
| 584 | |
Greg Kroah-Hartman | 8bf23e8 | 2014-08-30 17:18:04 -0700 | [diff] [blame] | 585 | gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 586 | if (!gb_tty) |
| 587 | return -ENOMEM; |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 588 | |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 589 | gb_tty->buffer_payload_max = |
| 590 | gb_operation_get_payload_size_max(connection); |
| 591 | if (!gb_tty->buffer_payload_max) { |
| 592 | kfree(gb_tty); |
| 593 | return -EINVAL; |
| 594 | } |
| 595 | |
| 596 | gb_tty->buffer = kzalloc(gb_tty->buffer_payload_max, GFP_KERNEL); |
| 597 | if (!gb_tty->buffer) { |
| 598 | kfree(gb_tty); |
| 599 | return -ENOMEM; |
| 600 | } |
| 601 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 602 | gb_tty->connection = connection; |
Alex Elder | 93bbe85 | 2014-12-03 12:27:42 -0600 | [diff] [blame] | 603 | connection->private = gb_tty; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 604 | |
| 605 | /* Check for compatible protocol version */ |
| 606 | retval = get_version(gb_tty); |
| 607 | if (retval) |
| 608 | goto error_version; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 609 | |
| 610 | minor = alloc_minor(gb_tty); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 611 | if (minor < 0) { |
| 612 | if (minor == -ENOSPC) { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 613 | dev_err(&connection->dev, |
| 614 | "no more free minor numbers\n"); |
Phong Tran | 55f2291 | 2015-06-01 22:19:45 +0700 | [diff] [blame] | 615 | retval = -ENODEV; |
| 616 | goto error_version; |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 617 | } |
Phong Tran | 55f2291 | 2015-06-01 22:19:45 +0700 | [diff] [blame] | 618 | retval = minor; |
| 619 | goto error_version; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | gb_tty->minor = minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 623 | spin_lock_init(&gb_tty->write_lock); |
| 624 | spin_lock_init(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 625 | init_waitqueue_head(&gb_tty->wioctl); |
| 626 | mutex_init(&gb_tty->mutex); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 627 | |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 628 | tty_port_init(&gb_tty->port); |
| 629 | gb_tty->port.ops = &null_ops; |
| 630 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 631 | send_control(gb_tty, gb_tty->ctrlout); |
| 632 | |
| 633 | /* initialize the uart to be 9600n81 */ |
| 634 | gb_tty->line_coding.rate = cpu_to_le32(9600); |
| 635 | gb_tty->line_coding.format = GB_SERIAL_1_STOP_BITS; |
| 636 | gb_tty->line_coding.parity = GB_SERIAL_NO_PARITY; |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 637 | gb_tty->line_coding.data_bits = 8; |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 638 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 639 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 640 | tty_dev = tty_port_register_device(&gb_tty->port, gb_tty_driver, minor, |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 641 | &connection->dev); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 642 | if (IS_ERR(tty_dev)) { |
| 643 | retval = PTR_ERR(tty_dev); |
| 644 | goto error; |
| 645 | } |
| 646 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 647 | return 0; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 648 | error: |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 649 | tty_port_destroy(&gb_tty->port); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 650 | release_minor(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 651 | error_version: |
| 652 | connection->private = NULL; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 653 | kfree(gb_tty->buffer); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 654 | kfree(gb_tty); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 655 | return retval; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 656 | } |
| 657 | |
Greg Kroah-Hartman | 059b093 | 2014-10-28 09:49:33 +0800 | [diff] [blame] | 658 | static void gb_uart_connection_exit(struct gb_connection *connection) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 659 | { |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 660 | struct gb_tty *gb_tty = connection->private; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 661 | struct tty_struct *tty; |
| 662 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 663 | if (!gb_tty) |
| 664 | return; |
| 665 | |
| 666 | mutex_lock(&gb_tty->mutex); |
| 667 | gb_tty->disconnected = true; |
| 668 | |
| 669 | wake_up_all(&gb_tty->wioctl); |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 670 | connection->private = NULL; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 671 | mutex_unlock(&gb_tty->mutex); |
| 672 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 673 | tty = tty_port_tty_get(&gb_tty->port); |
| 674 | if (tty) { |
| 675 | tty_vhangup(tty); |
| 676 | tty_kref_put(tty); |
| 677 | } |
| 678 | /* FIXME - stop all traffic */ |
| 679 | |
| 680 | tty_unregister_device(gb_tty_driver, gb_tty->minor); |
| 681 | |
Viresh Kumar | 696e0cc | 2014-11-21 11:26:30 +0530 | [diff] [blame] | 682 | /* FIXME - free transmit / receive buffers */ |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 683 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 684 | tty_port_put(&gb_tty->port); |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 685 | tty_port_destroy(&gb_tty->port); |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 686 | kfree(gb_tty->buffer); |
Greg Kroah-Hartman | e5f167f | 2014-08-30 17:11:41 -0700 | [diff] [blame] | 687 | kfree(gb_tty); |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 688 | |
| 689 | /* If last device is gone, tear down the tty structures */ |
| 690 | if (atomic_dec_return(&reference_count) == 0) |
| 691 | gb_tty_exit(); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 692 | } |
| 693 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 694 | static int gb_tty_init(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 695 | { |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 696 | int retval = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 697 | |
Marti Bolivar | f8089c0 | 2014-09-05 23:56:09 -0400 | [diff] [blame] | 698 | gb_tty_driver = tty_alloc_driver(GB_NUM_MINORS, 0); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 699 | if (IS_ERR(gb_tty_driver)) { |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 700 | pr_err("Can not allocate tty driver\n"); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 701 | retval = -ENOMEM; |
| 702 | goto fail_unregister_dev; |
| 703 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 704 | |
| 705 | gb_tty_driver->driver_name = "gb"; |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 706 | gb_tty_driver->name = GB_NAME; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 707 | gb_tty_driver->major = 0; |
| 708 | gb_tty_driver->minor_start = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 709 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 710 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 711 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 712 | gb_tty_driver->init_termios = tty_std_termios; |
| 713 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 714 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 715 | |
| 716 | retval = tty_register_driver(gb_tty_driver); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 717 | if (retval) { |
| 718 | pr_err("Can not register tty driver: %d\n", retval); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 719 | goto fail_put_gb_tty; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 720 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 721 | |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 722 | return 0; |
| 723 | |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 724 | fail_put_gb_tty: |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 725 | put_tty_driver(gb_tty_driver); |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 726 | fail_unregister_dev: |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 727 | return retval; |
| 728 | } |
| 729 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 730 | static void gb_tty_exit(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 731 | { |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 732 | int major = MAJOR(gb_tty_driver->major); |
| 733 | int minor = gb_tty_driver->minor_start; |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 734 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 735 | tty_unregister_driver(gb_tty_driver); |
| 736 | put_tty_driver(gb_tty_driver); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 737 | unregister_chrdev_region(MKDEV(major, minor), GB_NUM_MINORS); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 738 | } |
Alex Elder | 3689f97 | 2014-10-27 06:04:30 -0500 | [diff] [blame] | 739 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 740 | static struct gb_protocol uart_protocol = { |
Greg Kroah-Hartman | 7422a1e | 2014-12-24 13:01:45 -0800 | [diff] [blame] | 741 | .name = "uart", |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 742 | .id = GREYBUS_PROTOCOL_UART, |
| 743 | .major = 0, |
| 744 | .minor = 1, |
Alex Elder | 5d9fd7e | 2014-11-05 16:12:54 -0600 | [diff] [blame] | 745 | .connection_init = gb_uart_connection_init, |
| 746 | .connection_exit = gb_uart_connection_exit, |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame^] | 747 | .request_recv = gb_uart_request_recv, |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 748 | }; |
| 749 | |
Viresh Kumar | bdac599 | 2015-05-20 17:20:10 +0530 | [diff] [blame] | 750 | gb_gpbridge_protocol_driver(uart_protocol); |