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 | 7fabc88 | 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 | 7fabc88 | 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; |
Greg Kroah-Hartman | 7f29ade | 2016-02-22 18:14:46 -0800 | [diff] [blame] | 46 | size_t 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; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 58 | u8 ctrlin; /* input control lines */ |
| 59 | u8 ctrlout; /* output control lines */ |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 60 | struct gb_tty_line_coding line_coding; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 61 | }; |
| 62 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 63 | static struct tty_driver *gb_tty_driver; |
| 64 | static DEFINE_IDR(tty_minors); |
| 65 | static DEFINE_MUTEX(table_lock); |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 66 | static atomic_t reference_count = ATOMIC_INIT(0); |
| 67 | |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 68 | static int gb_uart_receive_data_handler(struct gb_operation *op) |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 69 | { |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 70 | struct gb_connection *connection = op->connection; |
| 71 | struct gb_tty *gb_tty = connection->private; |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 72 | struct tty_port *port = &gb_tty->port; |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 73 | struct gb_message *request = op->request; |
| 74 | struct gb_uart_recv_data_request *receive_data; |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 75 | u16 recv_data_size; |
| 76 | int count; |
| 77 | unsigned long tty_flags = TTY_NORMAL; |
| 78 | |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 79 | if (request->payload_size < sizeof(*receive_data)) { |
| 80 | dev_err(&connection->bundle->dev, |
| 81 | "short receive-data request received (%zu < %zu)\n", |
| 82 | request->payload_size, sizeof(*receive_data)); |
| 83 | return -EINVAL; |
| 84 | } |
| 85 | |
| 86 | receive_data = op->request->payload; |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 87 | recv_data_size = le16_to_cpu(receive_data->size); |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 88 | |
| 89 | if (recv_data_size != request->payload_size - sizeof(*receive_data)) { |
| 90 | dev_err(&connection->bundle->dev, |
| 91 | "malformed receive-data request received (%u != %zu)\n", |
| 92 | recv_data_size, |
| 93 | request->payload_size - sizeof(*receive_data)); |
| 94 | return -EINVAL; |
| 95 | } |
| 96 | |
| 97 | if (!recv_data_size) |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 98 | return -EINVAL; |
| 99 | |
| 100 | if (receive_data->flags) { |
| 101 | if (receive_data->flags & GB_UART_RECV_FLAG_BREAK) |
| 102 | tty_flags = TTY_BREAK; |
| 103 | else if (receive_data->flags & GB_UART_RECV_FLAG_PARITY) |
| 104 | tty_flags = TTY_PARITY; |
| 105 | else if (receive_data->flags & GB_UART_RECV_FLAG_FRAMING) |
| 106 | tty_flags = TTY_FRAME; |
| 107 | |
| 108 | /* overrun is special, not associated with a char */ |
| 109 | if (receive_data->flags & GB_UART_RECV_FLAG_OVERRUN) |
| 110 | tty_insert_flip_char(port, 0, TTY_OVERRUN); |
| 111 | } |
| 112 | count = tty_insert_flip_string_fixed_flag(port, receive_data->data, |
| 113 | tty_flags, recv_data_size); |
| 114 | if (count != recv_data_size) { |
Greg Kroah-Hartman | 4f30bf3 | 2015-10-14 11:15:12 -0700 | [diff] [blame] | 115 | dev_err(&connection->bundle->dev, |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 116 | "UART: RX 0x%08x bytes only wrote 0x%08x\n", |
| 117 | recv_data_size, count); |
| 118 | } |
| 119 | if (count) |
| 120 | tty_flip_buffer_push(port); |
| 121 | return 0; |
| 122 | } |
| 123 | |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 124 | static int gb_uart_serial_state_handler(struct gb_operation *op) |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 125 | { |
| 126 | struct gb_connection *connection = op->connection; |
| 127 | struct gb_tty *gb_tty = connection->private; |
| 128 | struct gb_message *request = op->request; |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 129 | struct gb_uart_serial_state_request *serial_state; |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 130 | |
| 131 | if (request->payload_size < sizeof(*serial_state)) { |
| 132 | dev_err(&connection->bundle->dev, |
| 133 | "short serial-state event received (%zu < %zu)\n", |
| 134 | request->payload_size, sizeof(*serial_state)); |
| 135 | return -EINVAL; |
| 136 | } |
| 137 | |
| 138 | serial_state = request->payload; |
| 139 | gb_tty->ctrlin = serial_state->control; |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int gb_uart_request_recv(u8 type, struct gb_operation *op) |
| 145 | { |
| 146 | struct gb_connection *connection = op->connection; |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 147 | int ret; |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 148 | |
| 149 | switch (type) { |
| 150 | case GB_UART_TYPE_RECEIVE_DATA: |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 151 | ret = gb_uart_receive_data_handler(op); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 152 | break; |
| 153 | case GB_UART_TYPE_SERIAL_STATE: |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 154 | ret = gb_uart_serial_state_handler(op); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 155 | break; |
| 156 | default: |
Greg Kroah-Hartman | 4f30bf3 | 2015-10-14 11:15:12 -0700 | [diff] [blame] | 157 | dev_err(&connection->bundle->dev, |
Viresh Kumar | b933fa4 | 2015-12-04 21:30:10 +0530 | [diff] [blame] | 158 | "unsupported unsolicited request: 0x%02x\n", type); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 159 | ret = -EINVAL; |
| 160 | } |
| 161 | |
| 162 | return ret; |
| 163 | } |
| 164 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 165 | static int send_data(struct gb_tty *tty, u16 size, const u8 *data) |
| 166 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 167 | struct gb_uart_send_data_request *request; |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 168 | int ret; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 169 | |
| 170 | if (!data || !size) |
| 171 | return 0; |
| 172 | |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 173 | if (size > tty->buffer_payload_max) |
| 174 | size = tty->buffer_payload_max; |
| 175 | request = tty->buffer; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 176 | request->size = cpu_to_le16(size); |
| 177 | memcpy(&request->data[0], data, size); |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 178 | ret = gb_operation_sync(tty->connection, GB_UART_TYPE_SEND_DATA, |
| 179 | request, sizeof(*request) + size, NULL, 0); |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 180 | if (ret) |
| 181 | return ret; |
| 182 | else |
| 183 | return size; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 184 | } |
| 185 | |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 186 | static int send_line_coding(struct gb_tty *tty) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 187 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 188 | struct gb_uart_set_line_coding_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 189 | |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 190 | memcpy(&request, &tty->line_coding, |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 191 | sizeof(tty->line_coding)); |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 192 | 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] | 193 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 194 | } |
| 195 | |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 196 | static int send_control(struct gb_tty *gb_tty, u8 control) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 197 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 198 | struct gb_uart_set_control_line_state_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 199 | |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 200 | request.control = control; |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 201 | return gb_operation_sync(gb_tty->connection, |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 202 | GB_UART_TYPE_SET_CONTROL_LINE_STATE, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 203 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 204 | } |
| 205 | |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 206 | static int send_break(struct gb_tty *gb_tty, u8 state) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 207 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 208 | struct gb_uart_set_break_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 209 | |
| 210 | if ((state != 0) && (state != 1)) { |
Greg Kroah-Hartman | 4f30bf3 | 2015-10-14 11:15:12 -0700 | [diff] [blame] | 211 | dev_err(&gb_tty->connection->bundle->dev, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 212 | "invalid break state of %d\n", state); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 213 | return -EINVAL; |
| 214 | } |
| 215 | |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 216 | request.state = state; |
Bryan O'Donoghue | a519203 | 2015-07-14 02:10:18 +0100 | [diff] [blame] | 217 | return gb_operation_sync(gb_tty->connection, GB_UART_TYPE_SEND_BREAK, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 218 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 219 | } |
| 220 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 221 | |
| 222 | static struct gb_tty *get_gb_by_minor(unsigned minor) |
| 223 | { |
| 224 | struct gb_tty *gb_tty; |
| 225 | |
| 226 | mutex_lock(&table_lock); |
| 227 | gb_tty = idr_find(&tty_minors, minor); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 228 | if (gb_tty) { |
| 229 | mutex_lock(&gb_tty->mutex); |
| 230 | if (gb_tty->disconnected) { |
| 231 | mutex_unlock(&gb_tty->mutex); |
| 232 | gb_tty = NULL; |
| 233 | } else { |
| 234 | tty_port_get(&gb_tty->port); |
| 235 | mutex_unlock(&gb_tty->mutex); |
| 236 | } |
| 237 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 238 | mutex_unlock(&table_lock); |
| 239 | return gb_tty; |
| 240 | } |
| 241 | |
| 242 | static int alloc_minor(struct gb_tty *gb_tty) |
| 243 | { |
| 244 | int minor; |
| 245 | |
| 246 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 247 | 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] | 248 | mutex_unlock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 249 | if (minor >= 0) |
| 250 | gb_tty->minor = minor; |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 251 | return minor; |
| 252 | } |
| 253 | |
| 254 | static void release_minor(struct gb_tty *gb_tty) |
| 255 | { |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 256 | int minor = gb_tty->minor; |
| 257 | |
| 258 | gb_tty->minor = 0; /* Maybe should use an invalid value instead */ |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 259 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 260 | idr_remove(&tty_minors, minor); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 261 | mutex_unlock(&table_lock); |
| 262 | } |
| 263 | |
| 264 | static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 265 | { |
| 266 | struct gb_tty *gb_tty; |
| 267 | int retval; |
| 268 | |
| 269 | gb_tty = get_gb_by_minor(tty->index); |
| 270 | if (!gb_tty) |
| 271 | return -ENODEV; |
| 272 | |
| 273 | retval = tty_standard_install(driver, tty); |
| 274 | if (retval) |
| 275 | goto error; |
| 276 | |
| 277 | tty->driver_data = gb_tty; |
| 278 | return 0; |
| 279 | error: |
| 280 | tty_port_put(&gb_tty->port); |
| 281 | return retval; |
| 282 | } |
| 283 | |
| 284 | static int gb_tty_open(struct tty_struct *tty, struct file *file) |
| 285 | { |
| 286 | struct gb_tty *gb_tty = tty->driver_data; |
| 287 | |
| 288 | return tty_port_open(&gb_tty->port, tty, file); |
| 289 | } |
| 290 | |
| 291 | static void gb_tty_close(struct tty_struct *tty, struct file *file) |
| 292 | { |
| 293 | struct gb_tty *gb_tty = tty->driver_data; |
| 294 | |
| 295 | tty_port_close(&gb_tty->port, tty, file); |
| 296 | } |
| 297 | |
| 298 | static void gb_tty_cleanup(struct tty_struct *tty) |
| 299 | { |
| 300 | struct gb_tty *gb_tty = tty->driver_data; |
| 301 | |
| 302 | tty_port_put(&gb_tty->port); |
| 303 | } |
| 304 | |
| 305 | static void gb_tty_hangup(struct tty_struct *tty) |
| 306 | { |
| 307 | struct gb_tty *gb_tty = tty->driver_data; |
| 308 | |
| 309 | tty_port_hangup(&gb_tty->port); |
| 310 | } |
| 311 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 312 | static int gb_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| 313 | int count) |
| 314 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 315 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 316 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 317 | return send_data(gb_tty, count, buf); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static int gb_tty_write_room(struct tty_struct *tty) |
| 321 | { |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 322 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 323 | |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 324 | return gb_tty->buffer_payload_max; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | static int gb_tty_chars_in_buffer(struct tty_struct *tty) |
| 328 | { |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 329 | return 0; |
| 330 | } |
| 331 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 332 | static int gb_tty_break_ctl(struct tty_struct *tty, int state) |
| 333 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 334 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 335 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 336 | return send_break(gb_tty, state ? 1 : 0); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 337 | } |
| 338 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 339 | static void gb_tty_set_termios(struct tty_struct *tty, |
| 340 | struct ktermios *termios_old) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 341 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 342 | struct gb_tty *gb_tty = tty->driver_data; |
| 343 | struct ktermios *termios = &tty->termios; |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 344 | struct gb_tty_line_coding newline; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 345 | u8 newctrl = gb_tty->ctrlout; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 346 | |
| 347 | newline.rate = cpu_to_le32(tty_get_baud_rate(tty)); |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 348 | newline.format = termios->c_cflag & CSTOPB ? |
| 349 | GB_SERIAL_2_STOP_BITS : GB_SERIAL_1_STOP_BITS; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 350 | newline.parity = termios->c_cflag & PARENB ? |
| 351 | (termios->c_cflag & PARODD ? 1 : 2) + |
| 352 | (termios->c_cflag & CMSPAR ? 2 : 0) : 0; |
| 353 | |
| 354 | switch (termios->c_cflag & CSIZE) { |
| 355 | case CS5: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 356 | newline.data_bits = 5; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 357 | break; |
| 358 | case CS6: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 359 | newline.data_bits = 6; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 360 | break; |
| 361 | case CS7: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 362 | newline.data_bits = 7; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 363 | break; |
| 364 | case CS8: |
| 365 | default: |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 366 | newline.data_bits = 8; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 367 | break; |
| 368 | } |
| 369 | |
| 370 | /* FIXME: needs to clear unsupported bits in the termios */ |
| 371 | gb_tty->clocal = ((termios->c_cflag & CLOCAL) != 0); |
| 372 | |
| 373 | if (C_BAUD(tty) == B0) { |
| 374 | newline.rate = gb_tty->line_coding.rate; |
| 375 | newctrl &= GB_UART_CTRL_DTR; |
| 376 | } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) { |
| 377 | newctrl |= GB_UART_CTRL_DTR; |
| 378 | } |
| 379 | |
| 380 | if (newctrl != gb_tty->ctrlout) { |
| 381 | gb_tty->ctrlout = newctrl; |
| 382 | send_control(gb_tty, newctrl); |
| 383 | } |
| 384 | |
| 385 | if (memcpy(&gb_tty->line_coding, &newline, sizeof(newline))) { |
| 386 | memcpy(&gb_tty->line_coding, &newline, sizeof(newline)); |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 387 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 388 | } |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | static int gb_tty_tiocmget(struct tty_struct *tty) |
| 392 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 393 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 394 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 395 | return (gb_tty->ctrlout & GB_UART_CTRL_DTR ? TIOCM_DTR : 0) | |
| 396 | (gb_tty->ctrlout & GB_UART_CTRL_RTS ? TIOCM_RTS : 0) | |
| 397 | (gb_tty->ctrlin & GB_UART_CTRL_DSR ? TIOCM_DSR : 0) | |
| 398 | (gb_tty->ctrlin & GB_UART_CTRL_RI ? TIOCM_RI : 0) | |
| 399 | (gb_tty->ctrlin & GB_UART_CTRL_DCD ? TIOCM_CD : 0) | |
| 400 | TIOCM_CTS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | static int gb_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| 404 | unsigned int clear) |
| 405 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 406 | struct gb_tty *gb_tty = tty->driver_data; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 407 | u8 newctrl = gb_tty->ctrlout; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 408 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 409 | set = (set & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 410 | (set & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 411 | clear = (clear & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 412 | (clear & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 413 | |
| 414 | newctrl = (newctrl & ~clear) | set; |
| 415 | if (gb_tty->ctrlout == newctrl) |
| 416 | return 0; |
| 417 | |
| 418 | gb_tty->ctrlout = newctrl; |
| 419 | return send_control(gb_tty, newctrl); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 420 | } |
| 421 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 422 | static void gb_tty_throttle(struct tty_struct *tty) |
| 423 | { |
| 424 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 425 | unsigned char stop_char; |
| 426 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 427 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 428 | if (I_IXOFF(tty)) { |
| 429 | stop_char = STOP_CHAR(tty); |
| 430 | retval = gb_tty_write(tty, &stop_char, 1); |
| 431 | if (retval <= 0) |
| 432 | return; |
| 433 | } |
| 434 | |
| 435 | if (tty->termios.c_cflag & CRTSCTS) { |
| 436 | gb_tty->ctrlout &= ~GB_UART_CTRL_RTS; |
| 437 | retval = send_control(gb_tty, gb_tty->ctrlout); |
| 438 | } |
| 439 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | static void gb_tty_unthrottle(struct tty_struct *tty) |
| 443 | { |
| 444 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 445 | unsigned char start_char; |
| 446 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 447 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 448 | if (I_IXOFF(tty)) { |
| 449 | start_char = START_CHAR(tty); |
| 450 | retval = gb_tty_write(tty, &start_char, 1); |
| 451 | if (retval <= 0) |
| 452 | return; |
| 453 | } |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 454 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 455 | if (tty->termios.c_cflag & CRTSCTS) { |
| 456 | gb_tty->ctrlout |= GB_UART_CTRL_RTS; |
| 457 | retval = send_control(gb_tty, gb_tty->ctrlout); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 458 | } |
| 459 | } |
| 460 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 461 | static int get_serial_info(struct gb_tty *gb_tty, |
| 462 | struct serial_struct __user *info) |
| 463 | { |
| 464 | struct serial_struct tmp; |
| 465 | |
| 466 | if (!info) |
| 467 | return -EINVAL; |
| 468 | |
| 469 | memset(&tmp, 0, sizeof(tmp)); |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 470 | tmp.flags = ASYNC_LOW_LATENCY | ASYNC_SKIP_TEST; |
| 471 | tmp.type = PORT_16550A; |
| 472 | tmp.line = gb_tty->minor; |
| 473 | tmp.xmit_fifo_size = 16; |
| 474 | tmp.baud_base = 9600; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 475 | tmp.close_delay = gb_tty->port.close_delay / 10; |
| 476 | tmp.closing_wait = gb_tty->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 477 | ASYNC_CLOSING_WAIT_NONE : gb_tty->port.closing_wait / 10; |
| 478 | |
| 479 | if (copy_to_user(info, &tmp, sizeof(tmp))) |
| 480 | return -EFAULT; |
Greg Kroah-Hartman | 3be03d4 | 2014-09-01 19:10:06 -0700 | [diff] [blame] | 481 | return 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 482 | } |
| 483 | |
| 484 | static int set_serial_info(struct gb_tty *gb_tty, |
| 485 | struct serial_struct __user *newinfo) |
| 486 | { |
| 487 | struct serial_struct new_serial; |
| 488 | unsigned int closing_wait; |
| 489 | unsigned int close_delay; |
Alex Elder | 69f93ab | 2014-09-22 18:53:02 -0500 | [diff] [blame] | 490 | int retval = 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 491 | |
| 492 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 493 | return -EFAULT; |
| 494 | |
| 495 | close_delay = new_serial.close_delay * 10; |
| 496 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 497 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
| 498 | |
| 499 | mutex_lock(&gb_tty->port.mutex); |
| 500 | if (!capable(CAP_SYS_ADMIN)) { |
| 501 | if ((close_delay != gb_tty->port.close_delay) || |
| 502 | (closing_wait != gb_tty->port.closing_wait)) |
| 503 | retval = -EPERM; |
| 504 | else |
| 505 | retval = -EOPNOTSUPP; |
| 506 | } else { |
| 507 | gb_tty->port.close_delay = close_delay; |
| 508 | gb_tty->port.closing_wait = closing_wait; |
| 509 | } |
| 510 | mutex_unlock(&gb_tty->port.mutex); |
| 511 | return retval; |
| 512 | } |
| 513 | |
| 514 | static int wait_serial_change(struct gb_tty *gb_tty, unsigned long arg) |
| 515 | { |
| 516 | int retval = 0; |
| 517 | DECLARE_WAITQUEUE(wait, current); |
| 518 | struct async_icount old; |
| 519 | struct async_icount new; |
| 520 | |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 521 | if (!(arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 522 | return -EINVAL; |
| 523 | |
| 524 | do { |
| 525 | spin_lock_irq(&gb_tty->read_lock); |
| 526 | old = gb_tty->oldcount; |
| 527 | new = gb_tty->iocount; |
| 528 | gb_tty->oldcount = new; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 529 | spin_unlock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 530 | |
| 531 | if ((arg & TIOCM_DSR) && (old.dsr != new.dsr)) |
| 532 | break; |
| 533 | if ((arg & TIOCM_CD) && (old.dcd != new.dcd)) |
| 534 | break; |
| 535 | if ((arg & TIOCM_RI) && (old.rng != new.rng)) |
| 536 | break; |
| 537 | |
| 538 | add_wait_queue(&gb_tty->wioctl, &wait); |
| 539 | set_current_state(TASK_INTERRUPTIBLE); |
| 540 | schedule(); |
| 541 | remove_wait_queue(&gb_tty->wioctl, &wait); |
| 542 | if (gb_tty->disconnected) { |
| 543 | if (arg & TIOCM_CD) |
| 544 | break; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 545 | retval = -ENODEV; |
| 546 | } else if (signal_pending(current)) { |
| 547 | retval = -ERESTARTSYS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 548 | } |
| 549 | } while (!retval); |
| 550 | |
| 551 | return retval; |
| 552 | } |
| 553 | |
| 554 | static int get_serial_usage(struct gb_tty *gb_tty, |
| 555 | struct serial_icounter_struct __user *count) |
| 556 | { |
| 557 | struct serial_icounter_struct icount; |
| 558 | int retval = 0; |
| 559 | |
| 560 | memset(&icount, 0, sizeof(icount)); |
| 561 | icount.dsr = gb_tty->iocount.dsr; |
| 562 | icount.rng = gb_tty->iocount.rng; |
| 563 | icount.dcd = gb_tty->iocount.dcd; |
| 564 | icount.frame = gb_tty->iocount.frame; |
| 565 | icount.overrun = gb_tty->iocount.overrun; |
| 566 | icount.parity = gb_tty->iocount.parity; |
| 567 | icount.brk = gb_tty->iocount.brk; |
| 568 | |
| 569 | if (copy_to_user(count, &icount, sizeof(icount)) > 0) |
| 570 | retval = -EFAULT; |
| 571 | |
| 572 | return retval; |
| 573 | } |
| 574 | |
| 575 | static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 576 | unsigned long arg) |
| 577 | { |
| 578 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 579 | |
| 580 | switch (cmd) { |
| 581 | case TIOCGSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 582 | return get_serial_info(gb_tty, |
| 583 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 584 | case TIOCSSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 585 | return set_serial_info(gb_tty, |
| 586 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 587 | case TIOCMIWAIT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 588 | return wait_serial_change(gb_tty, arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 589 | case TIOCGICOUNT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 590 | return get_serial_usage(gb_tty, |
| 591 | (struct serial_icounter_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 592 | } |
| 593 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 594 | return -ENOIOCTLCMD; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 595 | } |
| 596 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 597 | |
| 598 | static const struct tty_operations gb_ops = { |
| 599 | .install = gb_tty_install, |
| 600 | .open = gb_tty_open, |
| 601 | .close = gb_tty_close, |
| 602 | .cleanup = gb_tty_cleanup, |
| 603 | .hangup = gb_tty_hangup, |
| 604 | .write = gb_tty_write, |
| 605 | .write_room = gb_tty_write_room, |
| 606 | .ioctl = gb_tty_ioctl, |
| 607 | .throttle = gb_tty_throttle, |
| 608 | .unthrottle = gb_tty_unthrottle, |
| 609 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 610 | .break_ctl = gb_tty_break_ctl, |
| 611 | .set_termios = gb_tty_set_termios, |
| 612 | .tiocmget = gb_tty_tiocmget, |
| 613 | .tiocmset = gb_tty_tiocmset, |
| 614 | }; |
| 615 | |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 616 | static struct tty_port_operations null_ops = { }; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 617 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 618 | static int gb_tty_init(void); |
| 619 | static void gb_tty_exit(void); |
| 620 | |
Greg Kroah-Hartman | 059b093 | 2014-10-28 09:49:33 +0800 | [diff] [blame] | 621 | static int gb_uart_connection_init(struct gb_connection *connection) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 622 | { |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 623 | size_t max_payload; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 624 | struct gb_tty *gb_tty; |
| 625 | struct device *tty_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 626 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 627 | int minor; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 628 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 629 | /* First time here, initialize the tty structures */ |
| 630 | if (atomic_inc_return(&reference_count) == 1) { |
| 631 | retval = gb_tty_init(); |
| 632 | if (retval) { |
| 633 | atomic_dec(&reference_count); |
| 634 | return retval; |
| 635 | } |
| 636 | } |
| 637 | |
Greg Kroah-Hartman | 8bf23e8 | 2014-08-30 17:18:04 -0700 | [diff] [blame] | 638 | gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL); |
Phong Tran | 55a8e35 | 2015-06-10 21:03:17 +0700 | [diff] [blame] | 639 | if (!gb_tty) { |
| 640 | retval = -ENOMEM; |
| 641 | goto error_alloc; |
| 642 | } |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 643 | |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 644 | max_payload = gb_operation_get_payload_size_max(connection); |
| 645 | if (max_payload < sizeof(struct gb_uart_send_data_request)) { |
| 646 | retval = -EINVAL; |
| 647 | goto error_payload; |
| 648 | } |
| 649 | |
| 650 | gb_tty->buffer_payload_max = max_payload - |
Greg Kroah-Hartman | 7f29ade | 2016-02-22 18:14:46 -0800 | [diff] [blame] | 651 | sizeof(struct gb_uart_send_data_request); |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 652 | |
| 653 | gb_tty->buffer = kzalloc(gb_tty->buffer_payload_max, GFP_KERNEL); |
| 654 | if (!gb_tty->buffer) { |
Phong Tran | 55a8e35 | 2015-06-10 21:03:17 +0700 | [diff] [blame] | 655 | retval = -ENOMEM; |
| 656 | goto error_payload; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 657 | } |
| 658 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 659 | gb_tty->connection = connection; |
Alex Elder | 93bbe85 | 2014-12-03 12:27:42 -0600 | [diff] [blame] | 660 | connection->private = gb_tty; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 661 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 662 | minor = alloc_minor(gb_tty); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 663 | if (minor < 0) { |
| 664 | if (minor == -ENOSPC) { |
Greg Kroah-Hartman | 4f30bf3 | 2015-10-14 11:15:12 -0700 | [diff] [blame] | 665 | dev_err(&connection->bundle->dev, |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 666 | "no more free minor numbers\n"); |
Phong Tran | 55f2291 | 2015-06-01 22:19:45 +0700 | [diff] [blame] | 667 | retval = -ENODEV; |
Viresh Kumar | a94e144 | 2015-08-11 07:36:11 +0530 | [diff] [blame] | 668 | goto error_minor; |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 669 | } |
Phong Tran | 55f2291 | 2015-06-01 22:19:45 +0700 | [diff] [blame] | 670 | retval = minor; |
Viresh Kumar | a94e144 | 2015-08-11 07:36:11 +0530 | [diff] [blame] | 671 | goto error_minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 672 | } |
| 673 | |
| 674 | gb_tty->minor = minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 675 | spin_lock_init(&gb_tty->write_lock); |
| 676 | spin_lock_init(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 677 | init_waitqueue_head(&gb_tty->wioctl); |
| 678 | mutex_init(&gb_tty->mutex); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 679 | |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 680 | tty_port_init(&gb_tty->port); |
| 681 | gb_tty->port.ops = &null_ops; |
| 682 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 683 | send_control(gb_tty, gb_tty->ctrlout); |
| 684 | |
| 685 | /* initialize the uart to be 9600n81 */ |
| 686 | gb_tty->line_coding.rate = cpu_to_le32(9600); |
| 687 | gb_tty->line_coding.format = GB_SERIAL_1_STOP_BITS; |
| 688 | gb_tty->line_coding.parity = GB_SERIAL_NO_PARITY; |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 689 | gb_tty->line_coding.data_bits = 8; |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 690 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 691 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 692 | tty_dev = tty_port_register_device(&gb_tty->port, gb_tty_driver, minor, |
Greg Kroah-Hartman | 4f30bf3 | 2015-10-14 11:15:12 -0700 | [diff] [blame] | 693 | &connection->bundle->dev); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 694 | if (IS_ERR(tty_dev)) { |
| 695 | retval = PTR_ERR(tty_dev); |
| 696 | goto error; |
| 697 | } |
| 698 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 699 | return 0; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 700 | error: |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 701 | tty_port_destroy(&gb_tty->port); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 702 | release_minor(gb_tty); |
Viresh Kumar | a94e144 | 2015-08-11 07:36:11 +0530 | [diff] [blame] | 703 | error_minor: |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 704 | connection->private = NULL; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 705 | kfree(gb_tty->buffer); |
Phong Tran | 55a8e35 | 2015-06-10 21:03:17 +0700 | [diff] [blame] | 706 | error_payload: |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 707 | kfree(gb_tty); |
Phong Tran | 55a8e35 | 2015-06-10 21:03:17 +0700 | [diff] [blame] | 708 | error_alloc: |
| 709 | if (atomic_dec_return(&reference_count) == 0) |
| 710 | gb_tty_exit(); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 711 | return retval; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 712 | } |
| 713 | |
Greg Kroah-Hartman | 059b093 | 2014-10-28 09:49:33 +0800 | [diff] [blame] | 714 | static void gb_uart_connection_exit(struct gb_connection *connection) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 715 | { |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 716 | struct gb_tty *gb_tty = connection->private; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 717 | struct tty_struct *tty; |
| 718 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 719 | if (!gb_tty) |
| 720 | return; |
| 721 | |
| 722 | mutex_lock(&gb_tty->mutex); |
| 723 | gb_tty->disconnected = true; |
| 724 | |
| 725 | wake_up_all(&gb_tty->wioctl); |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 726 | connection->private = NULL; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 727 | mutex_unlock(&gb_tty->mutex); |
| 728 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 729 | tty = tty_port_tty_get(&gb_tty->port); |
| 730 | if (tty) { |
| 731 | tty_vhangup(tty); |
| 732 | tty_kref_put(tty); |
| 733 | } |
| 734 | /* FIXME - stop all traffic */ |
| 735 | |
| 736 | tty_unregister_device(gb_tty_driver, gb_tty->minor); |
| 737 | |
Viresh Kumar | 696e0cc | 2014-11-21 11:26:30 +0530 | [diff] [blame] | 738 | /* FIXME - free transmit / receive buffers */ |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 739 | |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 740 | tty_port_destroy(&gb_tty->port); |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 741 | kfree(gb_tty->buffer); |
Greg Kroah-Hartman | e5f167f | 2014-08-30 17:11:41 -0700 | [diff] [blame] | 742 | kfree(gb_tty); |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 743 | |
| 744 | /* If last device is gone, tear down the tty structures */ |
| 745 | if (atomic_dec_return(&reference_count) == 0) |
| 746 | gb_tty_exit(); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 747 | } |
| 748 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 749 | static int gb_tty_init(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 750 | { |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 751 | int retval = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 752 | |
Marti Bolivar | f8089c0 | 2014-09-05 23:56:09 -0400 | [diff] [blame] | 753 | gb_tty_driver = tty_alloc_driver(GB_NUM_MINORS, 0); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 754 | if (IS_ERR(gb_tty_driver)) { |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 755 | pr_err("Can not allocate tty driver\n"); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 756 | retval = -ENOMEM; |
| 757 | goto fail_unregister_dev; |
| 758 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 759 | |
| 760 | gb_tty_driver->driver_name = "gb"; |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 761 | gb_tty_driver->name = GB_NAME; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 762 | gb_tty_driver->major = 0; |
| 763 | gb_tty_driver->minor_start = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 764 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 765 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 766 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 767 | gb_tty_driver->init_termios = tty_std_termios; |
| 768 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 769 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 770 | |
| 771 | retval = tty_register_driver(gb_tty_driver); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 772 | if (retval) { |
| 773 | pr_err("Can not register tty driver: %d\n", retval); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 774 | goto fail_put_gb_tty; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 775 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 776 | |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 777 | return 0; |
| 778 | |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 779 | fail_put_gb_tty: |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 780 | put_tty_driver(gb_tty_driver); |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 781 | fail_unregister_dev: |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 782 | return retval; |
| 783 | } |
| 784 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 785 | static void gb_tty_exit(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 786 | { |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 787 | tty_unregister_driver(gb_tty_driver); |
| 788 | put_tty_driver(gb_tty_driver); |
Greg Kroah-Hartman | 5c1ac69 | 2015-07-08 10:44:09 -0700 | [diff] [blame] | 789 | idr_destroy(&tty_minors); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 790 | } |
Alex Elder | 3689f97 | 2014-10-27 06:04:30 -0500 | [diff] [blame] | 791 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 792 | static struct gb_protocol uart_protocol = { |
Greg Kroah-Hartman | 7422a1e | 2014-12-24 13:01:45 -0800 | [diff] [blame] | 793 | .name = "uart", |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 794 | .id = GREYBUS_PROTOCOL_UART, |
Viresh Kumar | 9475fb5 | 2015-08-08 10:25:39 +0530 | [diff] [blame] | 795 | .major = GB_UART_VERSION_MAJOR, |
| 796 | .minor = GB_UART_VERSION_MINOR, |
Alex Elder | 5d9fd7e | 2014-11-05 16:12:54 -0600 | [diff] [blame] | 797 | .connection_init = gb_uart_connection_init, |
| 798 | .connection_exit = gb_uart_connection_exit, |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 799 | .request_recv = gb_uart_request_recv, |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 800 | }; |
| 801 | |
Viresh Kumar | e18822e | 2015-07-01 12:13:52 +0530 | [diff] [blame] | 802 | gb_builtin_protocol_driver(uart_protocol); |