Greg Kroah-Hartman | eb50fd3 | 2017-11-07 14:58:41 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 2 | /* |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 3 | * UART driver for the Greybus "generic" UART module. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 4 | * |
| 5 | * Copyright 2014 Google Inc. |
Alex Elder | a46e967 | 2014-12-12 12:08:42 -0600 | [diff] [blame] | 6 | * Copyright 2014 Linaro Ltd. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 7 | * |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 8 | * Heavily based on drivers/usb/class/cdc-acm.c and |
| 9 | * drivers/usb/serial/usb-serial.c. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 10 | */ |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 12 | |
| 13 | #include <linux/kernel.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 14 | #include <linux/errno.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 15 | #include <linux/module.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 16 | #include <linux/sched/signal.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 17 | #include <linux/wait.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 18 | #include <linux/slab.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 21 | #include <linux/tty.h> |
| 22 | #include <linux/serial.h> |
| 23 | #include <linux/tty_driver.h> |
| 24 | #include <linux/tty_flip.h> |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 25 | #include <linux/idr.h> |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 26 | #include <linux/fs.h> |
| 27 | #include <linux/kdev_t.h> |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 28 | #include <linux/kfifo.h> |
| 29 | #include <linux/workqueue.h> |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 30 | #include <linux/completion.h> |
Greg Kroah-Hartman | ec0ad86 | 2019-08-25 07:54:27 +0200 | [diff] [blame] | 31 | #include <linux/greybus.h> |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 32 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 33 | #include "gbphy.h" |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 34 | |
simran singhal | 4452b09 | 2017-03-04 23:11:00 +0530 | [diff] [blame] | 35 | #define GB_NUM_MINORS 16 /* 16 is more than enough */ |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 36 | #define GB_NAME "ttyGB" |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 37 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 38 | #define GB_UART_WRITE_FIFO_SIZE PAGE_SIZE |
| 39 | #define GB_UART_WRITE_ROOM_MARGIN 1 /* leave some space in fifo */ |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 40 | #define GB_UART_FIRMWARE_CREDITS 4096 |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 41 | #define GB_UART_CREDIT_WAIT_TIMEOUT_MSEC 10000 |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 42 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 43 | struct gb_tty { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 44 | struct gbphy_device *gbphy_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 45 | struct tty_port port; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 46 | void *buffer; |
Greg Kroah-Hartman | 7f29ade | 2016-02-22 18:14:46 -0800 | [diff] [blame] | 47 | size_t buffer_payload_max; |
Greg Kroah-Hartman | aed0bc6 | 2014-10-27 17:32:34 +0800 | [diff] [blame] | 48 | struct gb_connection *connection; |
Alex Elder | 1cfc667 | 2014-09-30 19:25:21 -0500 | [diff] [blame] | 49 | u16 cport_id; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 50 | unsigned int minor; |
| 51 | unsigned char clocal; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 52 | bool disconnected; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 53 | spinlock_t read_lock; |
| 54 | spinlock_t write_lock; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 55 | struct async_icount iocount; |
| 56 | struct async_icount oldcount; |
| 57 | wait_queue_head_t wioctl; |
| 58 | struct mutex mutex; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 59 | u8 ctrlin; /* input control lines */ |
| 60 | u8 ctrlout; /* output control lines */ |
Johan Hovold | 6064aee | 2020-05-14 09:05:48 +0200 | [diff] [blame] | 61 | struct gb_uart_set_line_coding_request line_coding; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 62 | struct work_struct tx_work; |
| 63 | struct kfifo write_fifo; |
| 64 | bool close_pending; |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 65 | unsigned int credits; |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 66 | struct completion credits_complete; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 67 | }; |
| 68 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 69 | static struct tty_driver *gb_tty_driver; |
| 70 | static DEFINE_IDR(tty_minors); |
| 71 | static DEFINE_MUTEX(table_lock); |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 72 | |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 73 | static int gb_uart_receive_data_handler(struct gb_operation *op) |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 74 | { |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 75 | struct gb_connection *connection = op->connection; |
Greg Kroah-Hartman | 0ec3063 | 2016-03-22 14:30:35 -0400 | [diff] [blame] | 76 | struct gb_tty *gb_tty = gb_connection_get_data(connection); |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 77 | struct tty_port *port = &gb_tty->port; |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 78 | struct gb_message *request = op->request; |
| 79 | struct gb_uart_recv_data_request *receive_data; |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 80 | u16 recv_data_size; |
| 81 | int count; |
| 82 | unsigned long tty_flags = TTY_NORMAL; |
| 83 | |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 84 | if (request->payload_size < sizeof(*receive_data)) { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 85 | dev_err(&gb_tty->gbphy_dev->dev, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 86 | "short receive-data request received (%zu < %zu)\n", |
| 87 | request->payload_size, sizeof(*receive_data)); |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 88 | return -EINVAL; |
| 89 | } |
| 90 | |
| 91 | receive_data = op->request->payload; |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 92 | recv_data_size = le16_to_cpu(receive_data->size); |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 93 | |
| 94 | if (recv_data_size != request->payload_size - sizeof(*receive_data)) { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 95 | dev_err(&gb_tty->gbphy_dev->dev, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 96 | "malformed receive-data request received (%u != %zu)\n", |
| 97 | recv_data_size, |
| 98 | request->payload_size - sizeof(*receive_data)); |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 99 | return -EINVAL; |
| 100 | } |
| 101 | |
| 102 | if (!recv_data_size) |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 103 | return -EINVAL; |
| 104 | |
| 105 | if (receive_data->flags) { |
| 106 | if (receive_data->flags & GB_UART_RECV_FLAG_BREAK) |
| 107 | tty_flags = TTY_BREAK; |
| 108 | else if (receive_data->flags & GB_UART_RECV_FLAG_PARITY) |
| 109 | tty_flags = TTY_PARITY; |
| 110 | else if (receive_data->flags & GB_UART_RECV_FLAG_FRAMING) |
| 111 | tty_flags = TTY_FRAME; |
| 112 | |
| 113 | /* overrun is special, not associated with a char */ |
| 114 | if (receive_data->flags & GB_UART_RECV_FLAG_OVERRUN) |
| 115 | tty_insert_flip_char(port, 0, TTY_OVERRUN); |
| 116 | } |
| 117 | count = tty_insert_flip_string_fixed_flag(port, receive_data->data, |
| 118 | tty_flags, recv_data_size); |
| 119 | if (count != recv_data_size) { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 120 | dev_err(&gb_tty->gbphy_dev->dev, |
Bryan O'Donoghue | 4c025cf | 2015-06-29 18:09:14 +0100 | [diff] [blame] | 121 | "UART: RX 0x%08x bytes only wrote 0x%08x\n", |
| 122 | recv_data_size, count); |
| 123 | } |
| 124 | if (count) |
| 125 | tty_flip_buffer_push(port); |
| 126 | return 0; |
| 127 | } |
| 128 | |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 129 | static int gb_uart_serial_state_handler(struct gb_operation *op) |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 130 | { |
| 131 | struct gb_connection *connection = op->connection; |
Greg Kroah-Hartman | 0ec3063 | 2016-03-22 14:30:35 -0400 | [diff] [blame] | 132 | struct gb_tty *gb_tty = gb_connection_get_data(connection); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 133 | struct gb_message *request = op->request; |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 134 | struct gb_uart_serial_state_request *serial_state; |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 135 | |
| 136 | if (request->payload_size < sizeof(*serial_state)) { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 137 | dev_err(&gb_tty->gbphy_dev->dev, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 138 | "short serial-state event received (%zu < %zu)\n", |
| 139 | request->payload_size, sizeof(*serial_state)); |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 140 | return -EINVAL; |
| 141 | } |
| 142 | |
| 143 | serial_state = request->payload; |
| 144 | gb_tty->ctrlin = serial_state->control; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 149 | static int gb_uart_receive_credits_handler(struct gb_operation *op) |
| 150 | { |
| 151 | struct gb_connection *connection = op->connection; |
| 152 | struct gb_tty *gb_tty = gb_connection_get_data(connection); |
| 153 | struct gb_message *request = op->request; |
| 154 | struct gb_uart_receive_credits_request *credit_request; |
| 155 | unsigned long flags; |
| 156 | unsigned int incoming_credits; |
| 157 | int ret = 0; |
| 158 | |
| 159 | if (request->payload_size < sizeof(*credit_request)) { |
| 160 | dev_err(&gb_tty->gbphy_dev->dev, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 161 | "short receive_credits event received (%zu < %zu)\n", |
| 162 | request->payload_size, |
| 163 | sizeof(*credit_request)); |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 164 | return -EINVAL; |
| 165 | } |
| 166 | |
| 167 | credit_request = request->payload; |
| 168 | incoming_credits = le16_to_cpu(credit_request->count); |
| 169 | |
| 170 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 171 | gb_tty->credits += incoming_credits; |
| 172 | if (gb_tty->credits > GB_UART_FIRMWARE_CREDITS) { |
| 173 | gb_tty->credits -= incoming_credits; |
| 174 | ret = -EINVAL; |
| 175 | } |
| 176 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 177 | |
| 178 | if (ret) { |
| 179 | dev_err(&gb_tty->gbphy_dev->dev, |
| 180 | "invalid number of incoming credits: %d\n", |
| 181 | incoming_credits); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | if (!gb_tty->close_pending) |
| 186 | schedule_work(&gb_tty->tx_work); |
| 187 | |
| 188 | /* |
| 189 | * the port the tty layer may be waiting for credits |
| 190 | */ |
| 191 | tty_port_tty_wakeup(&gb_tty->port); |
| 192 | |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 193 | if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS) |
| 194 | complete(&gb_tty->credits_complete); |
| 195 | |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 196 | return ret; |
| 197 | } |
| 198 | |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 199 | static int gb_uart_request_handler(struct gb_operation *op) |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 200 | { |
| 201 | struct gb_connection *connection = op->connection; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 202 | struct gb_tty *gb_tty = gb_connection_get_data(connection); |
| 203 | int type = op->type; |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 204 | int ret; |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 205 | |
| 206 | switch (type) { |
| 207 | case GB_UART_TYPE_RECEIVE_DATA: |
Johan Hovold | c5f338c | 2016-02-24 16:11:51 +0100 | [diff] [blame] | 208 | ret = gb_uart_receive_data_handler(op); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 209 | break; |
| 210 | case GB_UART_TYPE_SERIAL_STATE: |
Johan Hovold | cb7f00b | 2016-02-24 16:11:50 +0100 | [diff] [blame] | 211 | ret = gb_uart_serial_state_handler(op); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 212 | break; |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 213 | case GB_UART_TYPE_RECEIVE_CREDITS: |
| 214 | ret = gb_uart_receive_credits_handler(op); |
| 215 | break; |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 216 | default: |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 217 | dev_err(&gb_tty->gbphy_dev->dev, |
Viresh Kumar | b933fa4 | 2015-12-04 21:30:10 +0530 | [diff] [blame] | 218 | "unsupported unsolicited request: 0x%02x\n", type); |
Bryan O'Donoghue | 1c08701 | 2015-06-02 13:40:50 +0100 | [diff] [blame] | 219 | ret = -EINVAL; |
| 220 | } |
| 221 | |
| 222 | return ret; |
| 223 | } |
| 224 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 225 | static void gb_uart_tx_write_work(struct work_struct *work) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 226 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 227 | struct gb_uart_send_data_request *request; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 228 | struct gb_tty *gb_tty; |
| 229 | unsigned long flags; |
| 230 | unsigned int send_size; |
Bryan O'Donoghue | 563bd79 | 2015-06-02 13:40:48 +0100 | [diff] [blame] | 231 | int ret; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 232 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 233 | gb_tty = container_of(work, struct gb_tty, tx_work); |
| 234 | request = gb_tty->buffer; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 235 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 236 | while (1) { |
| 237 | if (gb_tty->close_pending) |
| 238 | break; |
| 239 | |
| 240 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 241 | send_size = gb_tty->buffer_payload_max; |
| 242 | if (send_size > gb_tty->credits) |
| 243 | send_size = gb_tty->credits; |
| 244 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 245 | send_size = kfifo_out_peek(&gb_tty->write_fifo, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 246 | &request->data[0], |
| 247 | send_size); |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 248 | if (!send_size) { |
| 249 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 250 | break; |
| 251 | } |
| 252 | |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 253 | gb_tty->credits -= send_size; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 254 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 255 | |
| 256 | request->size = cpu_to_le16(send_size); |
| 257 | ret = gb_operation_sync(gb_tty->connection, |
| 258 | GB_UART_TYPE_SEND_DATA, |
| 259 | request, sizeof(*request) + send_size, |
| 260 | NULL, 0); |
| 261 | if (ret) { |
| 262 | dev_err(&gb_tty->gbphy_dev->dev, |
| 263 | "send data error: %d\n", ret); |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 264 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 265 | gb_tty->credits += send_size; |
| 266 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 267 | if (!gb_tty->close_pending) |
| 268 | schedule_work(work); |
| 269 | return; |
| 270 | } |
| 271 | |
| 272 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 273 | ret = kfifo_out(&gb_tty->write_fifo, &request->data[0], |
| 274 | send_size); |
| 275 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 276 | |
| 277 | tty_port_tty_wakeup(&gb_tty->port); |
| 278 | } |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 279 | } |
| 280 | |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 281 | static int send_line_coding(struct gb_tty *tty) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 282 | { |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 283 | return gb_operation_sync(tty->connection, GB_UART_TYPE_SET_LINE_CODING, |
Johan Hovold | 6064aee | 2020-05-14 09:05:48 +0200 | [diff] [blame] | 284 | &tty->line_coding, sizeof(tty->line_coding), |
| 285 | NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 286 | } |
| 287 | |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 288 | static int send_control(struct gb_tty *gb_tty, u8 control) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 289 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 290 | struct gb_uart_set_control_line_state_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 291 | |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 292 | request.control = control; |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 293 | return gb_operation_sync(gb_tty->connection, |
Viresh Kumar | 530430b | 2015-01-21 18:12:35 +0530 | [diff] [blame] | 294 | GB_UART_TYPE_SET_CONTROL_LINE_STATE, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 295 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 296 | } |
| 297 | |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 298 | static int send_break(struct gb_tty *gb_tty, u8 state) |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 299 | { |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 300 | struct gb_uart_set_break_request request; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 301 | |
| 302 | if ((state != 0) && (state != 1)) { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 303 | dev_err(&gb_tty->gbphy_dev->dev, |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 304 | "invalid break state of %d\n", state); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 305 | return -EINVAL; |
| 306 | } |
| 307 | |
Greg Kroah-Hartman | e51f1d1 | 2014-11-23 17:45:21 -0800 | [diff] [blame] | 308 | request.state = state; |
Bryan O'Donoghue | a519203 | 2015-07-14 02:10:18 +0100 | [diff] [blame] | 309 | 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] | 310 | &request, sizeof(request), NULL, 0); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 311 | } |
| 312 | |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 313 | static int gb_uart_wait_for_all_credits(struct gb_tty *gb_tty) |
| 314 | { |
| 315 | int ret; |
| 316 | |
| 317 | if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS) |
| 318 | return 0; |
| 319 | |
| 320 | ret = wait_for_completion_timeout(&gb_tty->credits_complete, |
| 321 | msecs_to_jiffies(GB_UART_CREDIT_WAIT_TIMEOUT_MSEC)); |
| 322 | if (!ret) { |
| 323 | dev_err(&gb_tty->gbphy_dev->dev, |
| 324 | "time out waiting for credits\n"); |
| 325 | return -ETIMEDOUT; |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
Axel Haslam | 2b3b87f | 2016-05-31 14:36:12 +0200 | [diff] [blame] | 331 | static int gb_uart_flush(struct gb_tty *gb_tty, u8 flags) |
| 332 | { |
| 333 | struct gb_uart_serial_flush_request request; |
| 334 | |
| 335 | request.flags = flags; |
| 336 | return gb_operation_sync(gb_tty->connection, GB_UART_TYPE_FLUSH_FIFOS, |
| 337 | &request, sizeof(request), NULL, 0); |
| 338 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 339 | |
Chaehyun Lim | 26746a3 | 2016-09-22 10:56:43 +0900 | [diff] [blame] | 340 | static struct gb_tty *get_gb_by_minor(unsigned int minor) |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 341 | { |
| 342 | struct gb_tty *gb_tty; |
| 343 | |
| 344 | mutex_lock(&table_lock); |
| 345 | gb_tty = idr_find(&tty_minors, minor); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 346 | if (gb_tty) { |
| 347 | mutex_lock(&gb_tty->mutex); |
| 348 | if (gb_tty->disconnected) { |
| 349 | mutex_unlock(&gb_tty->mutex); |
| 350 | gb_tty = NULL; |
| 351 | } else { |
| 352 | tty_port_get(&gb_tty->port); |
| 353 | mutex_unlock(&gb_tty->mutex); |
| 354 | } |
| 355 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 356 | mutex_unlock(&table_lock); |
| 357 | return gb_tty; |
| 358 | } |
| 359 | |
| 360 | static int alloc_minor(struct gb_tty *gb_tty) |
| 361 | { |
| 362 | int minor; |
| 363 | |
| 364 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 365 | 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] | 366 | mutex_unlock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 367 | if (minor >= 0) |
| 368 | gb_tty->minor = minor; |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 369 | return minor; |
| 370 | } |
| 371 | |
| 372 | static void release_minor(struct gb_tty *gb_tty) |
| 373 | { |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 374 | int minor = gb_tty->minor; |
| 375 | |
| 376 | gb_tty->minor = 0; /* Maybe should use an invalid value instead */ |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 377 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 378 | idr_remove(&tty_minors, minor); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 379 | mutex_unlock(&table_lock); |
| 380 | } |
| 381 | |
| 382 | static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 383 | { |
| 384 | struct gb_tty *gb_tty; |
| 385 | int retval; |
| 386 | |
| 387 | gb_tty = get_gb_by_minor(tty->index); |
| 388 | if (!gb_tty) |
| 389 | return -ENODEV; |
| 390 | |
| 391 | retval = tty_standard_install(driver, tty); |
| 392 | if (retval) |
| 393 | goto error; |
| 394 | |
| 395 | tty->driver_data = gb_tty; |
| 396 | return 0; |
| 397 | error: |
| 398 | tty_port_put(&gb_tty->port); |
| 399 | return retval; |
| 400 | } |
| 401 | |
| 402 | static int gb_tty_open(struct tty_struct *tty, struct file *file) |
| 403 | { |
| 404 | struct gb_tty *gb_tty = tty->driver_data; |
| 405 | |
| 406 | return tty_port_open(&gb_tty->port, tty, file); |
| 407 | } |
| 408 | |
| 409 | static void gb_tty_close(struct tty_struct *tty, struct file *file) |
| 410 | { |
| 411 | struct gb_tty *gb_tty = tty->driver_data; |
| 412 | |
| 413 | tty_port_close(&gb_tty->port, tty, file); |
| 414 | } |
| 415 | |
| 416 | static void gb_tty_cleanup(struct tty_struct *tty) |
| 417 | { |
| 418 | struct gb_tty *gb_tty = tty->driver_data; |
| 419 | |
| 420 | tty_port_put(&gb_tty->port); |
| 421 | } |
| 422 | |
| 423 | static void gb_tty_hangup(struct tty_struct *tty) |
| 424 | { |
| 425 | struct gb_tty *gb_tty = tty->driver_data; |
| 426 | |
| 427 | tty_port_hangup(&gb_tty->port); |
| 428 | } |
| 429 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 430 | static int gb_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| 431 | int count) |
| 432 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 433 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 434 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 435 | count = kfifo_in_spinlocked(&gb_tty->write_fifo, buf, count, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 436 | &gb_tty->write_lock); |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 437 | if (count && !gb_tty->close_pending) |
| 438 | schedule_work(&gb_tty->tx_work); |
| 439 | |
| 440 | return count; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 441 | } |
| 442 | |
Jiri Slaby | 03b3b1a | 2021-05-05 11:19:15 +0200 | [diff] [blame] | 443 | static unsigned int gb_tty_write_room(struct tty_struct *tty) |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 444 | { |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 445 | struct gb_tty *gb_tty = tty->driver_data; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 446 | unsigned long flags; |
| 447 | int room; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 448 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 449 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 450 | room = kfifo_avail(&gb_tty->write_fifo); |
| 451 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 452 | |
| 453 | room -= GB_UART_WRITE_ROOM_MARGIN; |
| 454 | if (room < 0) |
| 455 | return 0; |
| 456 | |
| 457 | return room; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 458 | } |
| 459 | |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 460 | static unsigned int gb_tty_chars_in_buffer(struct tty_struct *tty) |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 461 | { |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 462 | struct gb_tty *gb_tty = tty->driver_data; |
| 463 | unsigned long flags; |
Jiri Slaby | fff4ef1 | 2021-05-05 11:19:19 +0200 | [diff] [blame] | 464 | unsigned int chars; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 465 | |
| 466 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 467 | chars = kfifo_len(&gb_tty->write_fifo); |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 468 | if (gb_tty->credits < GB_UART_FIRMWARE_CREDITS) |
| 469 | chars += GB_UART_FIRMWARE_CREDITS - gb_tty->credits; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 470 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 471 | |
| 472 | return chars; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 473 | } |
| 474 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 475 | static int gb_tty_break_ctl(struct tty_struct *tty, int state) |
| 476 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 477 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 478 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 479 | return send_break(gb_tty, state ? 1 : 0); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 480 | } |
| 481 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 482 | static void gb_tty_set_termios(struct tty_struct *tty, |
| 483 | struct ktermios *termios_old) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 484 | { |
Johan Hovold | 6064aee | 2020-05-14 09:05:48 +0200 | [diff] [blame] | 485 | struct gb_uart_set_line_coding_request newline; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 486 | struct gb_tty *gb_tty = tty->driver_data; |
| 487 | struct ktermios *termios = &tty->termios; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 488 | u8 newctrl = gb_tty->ctrlout; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 489 | |
| 490 | newline.rate = cpu_to_le32(tty_get_baud_rate(tty)); |
Bryan O'Donoghue | 62229a1 | 2015-06-02 13:40:51 +0100 | [diff] [blame] | 491 | newline.format = termios->c_cflag & CSTOPB ? |
| 492 | GB_SERIAL_2_STOP_BITS : GB_SERIAL_1_STOP_BITS; |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 493 | newline.parity = termios->c_cflag & PARENB ? |
| 494 | (termios->c_cflag & PARODD ? 1 : 2) + |
| 495 | (termios->c_cflag & CMSPAR ? 2 : 0) : 0; |
| 496 | |
Jiri Slaby | 3ec2ff3 | 2021-06-10 11:02:47 +0200 | [diff] [blame] | 497 | newline.data_bits = tty_get_char_size(termios->c_cflag); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 498 | |
| 499 | /* FIXME: needs to clear unsupported bits in the termios */ |
| 500 | gb_tty->clocal = ((termios->c_cflag & CLOCAL) != 0); |
| 501 | |
| 502 | if (C_BAUD(tty) == B0) { |
| 503 | newline.rate = gb_tty->line_coding.rate; |
Axel Haslam | e55c252 | 2016-05-31 14:36:08 +0200 | [diff] [blame] | 504 | newctrl &= ~(GB_UART_CTRL_DTR | GB_UART_CTRL_RTS); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 505 | } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) { |
Axel Haslam | e55c252 | 2016-05-31 14:36:08 +0200 | [diff] [blame] | 506 | newctrl |= (GB_UART_CTRL_DTR | GB_UART_CTRL_RTS); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | if (newctrl != gb_tty->ctrlout) { |
| 510 | gb_tty->ctrlout = newctrl; |
| 511 | send_control(gb_tty, newctrl); |
| 512 | } |
| 513 | |
Axel Haslam | e55c252 | 2016-05-31 14:36:08 +0200 | [diff] [blame] | 514 | if (C_CRTSCTS(tty) && C_BAUD(tty) != B0) |
Oscar Carter | 34625c1 | 2020-05-10 12:14:26 +0200 | [diff] [blame] | 515 | newline.flow_control = GB_SERIAL_AUTO_RTSCTS_EN; |
Axel Haslam | e55c252 | 2016-05-31 14:36:08 +0200 | [diff] [blame] | 516 | else |
Oscar Carter | 34625c1 | 2020-05-10 12:14:26 +0200 | [diff] [blame] | 517 | newline.flow_control = 0; |
Axel Haslam | e55c252 | 2016-05-31 14:36:08 +0200 | [diff] [blame] | 518 | |
Axel Haslam | b4b1b7e | 2016-04-20 20:47:20 +0200 | [diff] [blame] | 519 | if (memcmp(&gb_tty->line_coding, &newline, sizeof(newline))) { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 520 | memcpy(&gb_tty->line_coding, &newline, sizeof(newline)); |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 521 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 522 | } |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | static int gb_tty_tiocmget(struct tty_struct *tty) |
| 526 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 527 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 528 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 529 | return (gb_tty->ctrlout & GB_UART_CTRL_DTR ? TIOCM_DTR : 0) | |
| 530 | (gb_tty->ctrlout & GB_UART_CTRL_RTS ? TIOCM_RTS : 0) | |
| 531 | (gb_tty->ctrlin & GB_UART_CTRL_DSR ? TIOCM_DSR : 0) | |
| 532 | (gb_tty->ctrlin & GB_UART_CTRL_RI ? TIOCM_RI : 0) | |
| 533 | (gb_tty->ctrlin & GB_UART_CTRL_DCD ? TIOCM_CD : 0) | |
| 534 | TIOCM_CTS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | static int gb_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| 538 | unsigned int clear) |
| 539 | { |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 540 | struct gb_tty *gb_tty = tty->driver_data; |
Bryan O'Donoghue | ba4b099 | 2015-06-29 18:09:15 +0100 | [diff] [blame] | 541 | u8 newctrl = gb_tty->ctrlout; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 542 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 543 | set = (set & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 544 | (set & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 545 | clear = (clear & TIOCM_DTR ? GB_UART_CTRL_DTR : 0) | |
| 546 | (clear & TIOCM_RTS ? GB_UART_CTRL_RTS : 0); |
| 547 | |
| 548 | newctrl = (newctrl & ~clear) | set; |
| 549 | if (gb_tty->ctrlout == newctrl) |
| 550 | return 0; |
| 551 | |
| 552 | gb_tty->ctrlout = newctrl; |
| 553 | return send_control(gb_tty, newctrl); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 554 | } |
| 555 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 556 | static void gb_tty_throttle(struct tty_struct *tty) |
| 557 | { |
| 558 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 559 | unsigned char stop_char; |
| 560 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 561 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 562 | if (I_IXOFF(tty)) { |
| 563 | stop_char = STOP_CHAR(tty); |
| 564 | retval = gb_tty_write(tty, &stop_char, 1); |
| 565 | if (retval <= 0) |
| 566 | return; |
| 567 | } |
| 568 | |
| 569 | if (tty->termios.c_cflag & CRTSCTS) { |
| 570 | gb_tty->ctrlout &= ~GB_UART_CTRL_RTS; |
| 571 | retval = send_control(gb_tty, gb_tty->ctrlout); |
| 572 | } |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | static void gb_tty_unthrottle(struct tty_struct *tty) |
| 576 | { |
| 577 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 578 | unsigned char start_char; |
| 579 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 580 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 581 | if (I_IXOFF(tty)) { |
| 582 | start_char = START_CHAR(tty); |
| 583 | retval = gb_tty_write(tty, &start_char, 1); |
| 584 | if (retval <= 0) |
| 585 | return; |
| 586 | } |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 587 | |
Greg Kroah-Hartman | 980c7c5 | 2014-11-19 14:23:00 -0800 | [diff] [blame] | 588 | if (tty->termios.c_cflag & CRTSCTS) { |
| 589 | gb_tty->ctrlout |= GB_UART_CTRL_RTS; |
| 590 | retval = send_control(gb_tty, gb_tty->ctrlout); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 591 | } |
| 592 | } |
| 593 | |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 594 | static int get_serial_info(struct tty_struct *tty, |
| 595 | struct serial_struct *ss) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 596 | { |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 597 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 598 | |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 599 | ss->line = gb_tty->minor; |
Johan Hovold | b71e571 | 2021-04-07 12:23:23 +0200 | [diff] [blame] | 600 | ss->close_delay = jiffies_to_msecs(gb_tty->port.close_delay) / 10; |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 601 | ss->closing_wait = |
Gioh Kim | 461ab80 | 2017-02-09 17:30:11 +0100 | [diff] [blame] | 602 | gb_tty->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Johan Hovold | b71e571 | 2021-04-07 12:23:23 +0200 | [diff] [blame] | 603 | ASYNC_CLOSING_WAIT_NONE : |
| 604 | jiffies_to_msecs(gb_tty->port.closing_wait) / 10; |
| 605 | |
Greg Kroah-Hartman | 3be03d4 | 2014-09-01 19:10:06 -0700 | [diff] [blame] | 606 | return 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 607 | } |
| 608 | |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 609 | static int set_serial_info(struct tty_struct *tty, |
| 610 | struct serial_struct *ss) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 611 | { |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 612 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 613 | unsigned int closing_wait; |
| 614 | unsigned int close_delay; |
Alex Elder | 69f93ab | 2014-09-22 18:53:02 -0500 | [diff] [blame] | 615 | int retval = 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 616 | |
Johan Hovold | b71e571 | 2021-04-07 12:23:23 +0200 | [diff] [blame] | 617 | close_delay = msecs_to_jiffies(ss->close_delay * 10); |
Al Viro | 0aad5ad | 2018-09-11 21:58:45 -0400 | [diff] [blame] | 618 | closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Johan Hovold | b71e571 | 2021-04-07 12:23:23 +0200 | [diff] [blame] | 619 | ASYNC_CLOSING_WAIT_NONE : |
| 620 | msecs_to_jiffies(ss->closing_wait * 10); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 621 | |
| 622 | mutex_lock(&gb_tty->port.mutex); |
| 623 | if (!capable(CAP_SYS_ADMIN)) { |
| 624 | if ((close_delay != gb_tty->port.close_delay) || |
| 625 | (closing_wait != gb_tty->port.closing_wait)) |
| 626 | retval = -EPERM; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 627 | } else { |
| 628 | gb_tty->port.close_delay = close_delay; |
| 629 | gb_tty->port.closing_wait = closing_wait; |
| 630 | } |
| 631 | mutex_unlock(&gb_tty->port.mutex); |
| 632 | return retval; |
| 633 | } |
| 634 | |
| 635 | static int wait_serial_change(struct gb_tty *gb_tty, unsigned long arg) |
| 636 | { |
| 637 | int retval = 0; |
| 638 | DECLARE_WAITQUEUE(wait, current); |
| 639 | struct async_icount old; |
| 640 | struct async_icount new; |
| 641 | |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 642 | if (!(arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 643 | return -EINVAL; |
| 644 | |
| 645 | do { |
Johan Hovold | 2aae92b | 2016-06-27 20:07:12 +0200 | [diff] [blame] | 646 | spin_lock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 647 | old = gb_tty->oldcount; |
| 648 | new = gb_tty->iocount; |
| 649 | gb_tty->oldcount = new; |
Johan Hovold | 2aae92b | 2016-06-27 20:07:12 +0200 | [diff] [blame] | 650 | spin_unlock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 651 | |
| 652 | if ((arg & TIOCM_DSR) && (old.dsr != new.dsr)) |
| 653 | break; |
| 654 | if ((arg & TIOCM_CD) && (old.dcd != new.dcd)) |
| 655 | break; |
| 656 | if ((arg & TIOCM_RI) && (old.rng != new.rng)) |
| 657 | break; |
| 658 | |
| 659 | add_wait_queue(&gb_tty->wioctl, &wait); |
| 660 | set_current_state(TASK_INTERRUPTIBLE); |
| 661 | schedule(); |
| 662 | remove_wait_queue(&gb_tty->wioctl, &wait); |
| 663 | if (gb_tty->disconnected) { |
| 664 | if (arg & TIOCM_CD) |
| 665 | break; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 666 | retval = -ENODEV; |
| 667 | } else if (signal_pending(current)) { |
| 668 | retval = -ERESTARTSYS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 669 | } |
| 670 | } while (!retval); |
| 671 | |
| 672 | return retval; |
| 673 | } |
| 674 | |
Johan Hovold | 424a4b5 | 2016-11-08 13:31:19 +0100 | [diff] [blame] | 675 | static int gb_tty_get_icount(struct tty_struct *tty, |
| 676 | struct serial_icounter_struct *icount) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 677 | { |
Johan Hovold | 424a4b5 | 2016-11-08 13:31:19 +0100 | [diff] [blame] | 678 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 679 | |
Johan Hovold | 424a4b5 | 2016-11-08 13:31:19 +0100 | [diff] [blame] | 680 | icount->dsr = gb_tty->iocount.dsr; |
| 681 | icount->rng = gb_tty->iocount.rng; |
| 682 | icount->dcd = gb_tty->iocount.dcd; |
| 683 | icount->frame = gb_tty->iocount.frame; |
| 684 | icount->overrun = gb_tty->iocount.overrun; |
| 685 | icount->parity = gb_tty->iocount.parity; |
| 686 | icount->brk = gb_tty->iocount.brk; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 687 | |
Johan Hovold | 424a4b5 | 2016-11-08 13:31:19 +0100 | [diff] [blame] | 688 | return 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 692 | unsigned long arg) |
| 693 | { |
| 694 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 695 | |
| 696 | switch (cmd) { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 697 | case TIOCMIWAIT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 698 | return wait_serial_change(gb_tty, arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 699 | } |
| 700 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 701 | return -ENOIOCTLCMD; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 702 | } |
| 703 | |
Axel Haslam | 219ffcf | 2016-05-31 14:36:09 +0200 | [diff] [blame] | 704 | static void gb_tty_dtr_rts(struct tty_port *port, int on) |
| 705 | { |
| 706 | struct gb_tty *gb_tty; |
| 707 | u8 newctrl; |
| 708 | |
| 709 | gb_tty = container_of(port, struct gb_tty, port); |
| 710 | newctrl = gb_tty->ctrlout; |
| 711 | |
| 712 | if (on) |
| 713 | newctrl |= (GB_UART_CTRL_DTR | GB_UART_CTRL_RTS); |
| 714 | else |
| 715 | newctrl &= ~(GB_UART_CTRL_DTR | GB_UART_CTRL_RTS); |
| 716 | |
| 717 | gb_tty->ctrlout = newctrl; |
| 718 | send_control(gb_tty, newctrl); |
| 719 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 720 | |
Axel Haslam | 22b8708 | 2016-07-14 15:13:00 -0500 | [diff] [blame] | 721 | static int gb_tty_port_activate(struct tty_port *port, |
| 722 | struct tty_struct *tty) |
| 723 | { |
| 724 | struct gb_tty *gb_tty; |
| 725 | |
| 726 | gb_tty = container_of(port, struct gb_tty, port); |
| 727 | |
| 728 | return gbphy_runtime_get_sync(gb_tty->gbphy_dev); |
| 729 | } |
| 730 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 731 | static void gb_tty_port_shutdown(struct tty_port *port) |
| 732 | { |
| 733 | struct gb_tty *gb_tty; |
| 734 | unsigned long flags; |
Axel Haslam | 2b3b87f | 2016-05-31 14:36:12 +0200 | [diff] [blame] | 735 | int ret; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 736 | |
| 737 | gb_tty = container_of(port, struct gb_tty, port); |
| 738 | |
| 739 | gb_tty->close_pending = true; |
| 740 | |
| 741 | cancel_work_sync(&gb_tty->tx_work); |
| 742 | |
| 743 | spin_lock_irqsave(&gb_tty->write_lock, flags); |
| 744 | kfifo_reset_out(&gb_tty->write_fifo); |
| 745 | spin_unlock_irqrestore(&gb_tty->write_lock, flags); |
| 746 | |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 747 | if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS) |
| 748 | goto out; |
| 749 | |
Axel Haslam | 2b3b87f | 2016-05-31 14:36:12 +0200 | [diff] [blame] | 750 | ret = gb_uart_flush(gb_tty, GB_SERIAL_FLAG_FLUSH_TRANSMITTER); |
| 751 | if (ret) { |
| 752 | dev_err(&gb_tty->gbphy_dev->dev, |
| 753 | "error flushing transmitter: %d\n", ret); |
| 754 | } |
| 755 | |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 756 | gb_uart_wait_for_all_credits(gb_tty); |
| 757 | |
| 758 | out: |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 759 | gb_tty->close_pending = false; |
Axel Haslam | 22b8708 | 2016-07-14 15:13:00 -0500 | [diff] [blame] | 760 | |
| 761 | gbphy_runtime_put_autosuspend(gb_tty->gbphy_dev); |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 762 | } |
| 763 | |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 764 | static void gb_tty_port_destruct(struct tty_port *port) |
| 765 | { |
| 766 | struct gb_tty *gb_tty = container_of(port, struct gb_tty, port); |
| 767 | |
| 768 | if (gb_tty->minor != GB_NUM_MINORS) |
| 769 | release_minor(gb_tty); |
| 770 | kfifo_free(&gb_tty->write_fifo); |
| 771 | kfree(gb_tty->buffer); |
| 772 | kfree(gb_tty); |
| 773 | } |
| 774 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 775 | static const struct tty_operations gb_ops = { |
| 776 | .install = gb_tty_install, |
| 777 | .open = gb_tty_open, |
| 778 | .close = gb_tty_close, |
| 779 | .cleanup = gb_tty_cleanup, |
| 780 | .hangup = gb_tty_hangup, |
| 781 | .write = gb_tty_write, |
| 782 | .write_room = gb_tty_write_room, |
| 783 | .ioctl = gb_tty_ioctl, |
| 784 | .throttle = gb_tty_throttle, |
| 785 | .unthrottle = gb_tty_unthrottle, |
| 786 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 787 | .break_ctl = gb_tty_break_ctl, |
| 788 | .set_termios = gb_tty_set_termios, |
| 789 | .tiocmget = gb_tty_tiocmget, |
| 790 | .tiocmset = gb_tty_tiocmset, |
Johan Hovold | 424a4b5 | 2016-11-08 13:31:19 +0100 | [diff] [blame] | 791 | .get_icount = gb_tty_get_icount, |
Ioannis Valasakis | 327f2769 | 2018-11-09 13:54:23 +0000 | [diff] [blame] | 792 | .set_serial = set_serial_info, |
| 793 | .get_serial = get_serial_info, |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 794 | }; |
| 795 | |
Bhumika Goyal | 4d79f43 | 2016-10-15 12:28:01 +0530 | [diff] [blame] | 796 | static const struct tty_port_operations gb_port_ops = { |
Axel Haslam | 219ffcf | 2016-05-31 14:36:09 +0200 | [diff] [blame] | 797 | .dtr_rts = gb_tty_dtr_rts, |
Axel Haslam | 22b8708 | 2016-07-14 15:13:00 -0500 | [diff] [blame] | 798 | .activate = gb_tty_port_activate, |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 799 | .shutdown = gb_tty_port_shutdown, |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 800 | .destruct = gb_tty_port_destruct, |
Axel Haslam | 219ffcf | 2016-05-31 14:36:09 +0200 | [diff] [blame] | 801 | }; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 802 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 803 | static int gb_uart_probe(struct gbphy_device *gbphy_dev, |
| 804 | const struct gbphy_device_id *id) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 805 | { |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 806 | struct gb_connection *connection; |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 807 | size_t max_payload; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 808 | struct gb_tty *gb_tty; |
| 809 | struct device *tty_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 810 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 811 | int minor; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 812 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 813 | connection = gb_connection_create(gbphy_dev->bundle, |
| 814 | le16_to_cpu(gbphy_dev->cport_desc->id), |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 815 | gb_uart_request_handler); |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 816 | if (IS_ERR(connection)) |
| 817 | return PTR_ERR(connection); |
Bryan O'Donoghue | f95ad78 | 2015-06-02 13:40:47 +0100 | [diff] [blame] | 818 | |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 819 | max_payload = gb_operation_get_payload_size_max(connection); |
| 820 | if (max_payload < sizeof(struct gb_uart_send_data_request)) { |
| 821 | retval = -EINVAL; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 822 | goto exit_connection_destroy; |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 823 | } |
| 824 | |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 825 | gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL); |
| 826 | if (!gb_tty) { |
| 827 | retval = -ENOMEM; |
| 828 | goto exit_connection_destroy; |
| 829 | } |
| 830 | |
| 831 | tty_port_init(&gb_tty->port); |
| 832 | gb_tty->port.ops = &gb_port_ops; |
| 833 | gb_tty->minor = GB_NUM_MINORS; |
| 834 | |
Johan Hovold | 066f950 | 2016-02-24 16:11:49 +0100 | [diff] [blame] | 835 | gb_tty->buffer_payload_max = max_payload - |
Greg Kroah-Hartman | 7f29ade | 2016-02-22 18:14:46 -0800 | [diff] [blame] | 836 | sizeof(struct gb_uart_send_data_request); |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 837 | |
| 838 | gb_tty->buffer = kzalloc(gb_tty->buffer_payload_max, GFP_KERNEL); |
| 839 | if (!gb_tty->buffer) { |
Phong Tran | 55a8e35 | 2015-06-10 21:03:17 +0700 | [diff] [blame] | 840 | retval = -ENOMEM; |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 841 | goto exit_put_port; |
Bryan O'Donoghue | dd1c64e | 2015-06-02 13:40:49 +0100 | [diff] [blame] | 842 | } |
| 843 | |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 844 | INIT_WORK(&gb_tty->tx_work, gb_uart_tx_write_work); |
| 845 | |
| 846 | retval = kfifo_alloc(&gb_tty->write_fifo, GB_UART_WRITE_FIFO_SIZE, |
Chaehyun Lim | 319b78c | 2016-09-22 10:56:44 +0900 | [diff] [blame] | 847 | GFP_KERNEL); |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 848 | if (retval) |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 849 | goto exit_put_port; |
Axel Haslam | 8d6fbe9 | 2016-05-31 14:36:10 +0200 | [diff] [blame] | 850 | |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 851 | gb_tty->credits = GB_UART_FIRMWARE_CREDITS; |
Axel Haslam | 5dad5c3 | 2016-05-31 14:36:13 +0200 | [diff] [blame] | 852 | init_completion(&gb_tty->credits_complete); |
Axel Haslam | a8bc00f | 2016-05-31 14:36:11 +0200 | [diff] [blame] | 853 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 854 | minor = alloc_minor(gb_tty); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 855 | if (minor < 0) { |
| 856 | if (minor == -ENOSPC) { |
Viresh Kumar | 4fa5891 | 2016-10-12 08:02:22 +0530 | [diff] [blame] | 857 | dev_err(&gbphy_dev->dev, |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 858 | "no more free minor numbers\n"); |
Phong Tran | 55f2291 | 2015-06-01 22:19:45 +0700 | [diff] [blame] | 859 | retval = -ENODEV; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 860 | } else { |
| 861 | retval = minor; |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 862 | } |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 863 | goto exit_put_port; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | gb_tty->minor = minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 867 | spin_lock_init(&gb_tty->write_lock); |
| 868 | spin_lock_init(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 869 | init_waitqueue_head(&gb_tty->wioctl); |
| 870 | mutex_init(&gb_tty->mutex); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 871 | |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 872 | gb_tty->connection = connection; |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 873 | gb_tty->gbphy_dev = gbphy_dev; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 874 | gb_connection_set_data(connection, gb_tty); |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 875 | gb_gbphy_set_data(gbphy_dev, gb_tty); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 876 | |
| 877 | retval = gb_connection_enable_tx(connection); |
| 878 | if (retval) |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 879 | goto exit_put_port; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 880 | |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 881 | send_control(gb_tty, gb_tty->ctrlout); |
| 882 | |
| 883 | /* initialize the uart to be 9600n81 */ |
| 884 | gb_tty->line_coding.rate = cpu_to_le32(9600); |
| 885 | gb_tty->line_coding.format = GB_SERIAL_1_STOP_BITS; |
| 886 | gb_tty->line_coding.parity = GB_SERIAL_NO_PARITY; |
Bryan O'Donoghue | 11fca14 | 2015-06-02 13:40:45 +0100 | [diff] [blame] | 887 | gb_tty->line_coding.data_bits = 8; |
Greg Kroah-Hartman | 9f240f2 | 2014-11-24 13:52:25 -0800 | [diff] [blame] | 888 | send_line_coding(gb_tty); |
Greg Kroah-Hartman | b4be404 | 2014-11-15 18:30:00 -0800 | [diff] [blame] | 889 | |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 890 | retval = gb_connection_enable(connection); |
| 891 | if (retval) |
| 892 | goto exit_connection_disable; |
| 893 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 894 | tty_dev = tty_port_register_device(&gb_tty->port, gb_tty_driver, minor, |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 895 | &gbphy_dev->dev); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 896 | if (IS_ERR(tty_dev)) { |
| 897 | retval = PTR_ERR(tty_dev); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 898 | goto exit_connection_disable; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 899 | } |
| 900 | |
Axel Haslam | 22b8708 | 2016-07-14 15:13:00 -0500 | [diff] [blame] | 901 | gbphy_runtime_put_autosuspend(gbphy_dev); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 902 | return 0; |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 903 | |
| 904 | exit_connection_disable: |
| 905 | gb_connection_disable(connection); |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 906 | exit_put_port: |
| 907 | tty_port_put(&gb_tty->port); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 908 | exit_connection_destroy: |
| 909 | gb_connection_destroy(connection); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 910 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 911 | return retval; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 912 | } |
| 913 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 914 | static void gb_uart_remove(struct gbphy_device *gbphy_dev) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 915 | { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 916 | struct gb_tty *gb_tty = gb_gbphy_get_data(gbphy_dev); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 917 | struct gb_connection *connection = gb_tty->connection; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 918 | struct tty_struct *tty; |
Axel Haslam | 22b8708 | 2016-07-14 15:13:00 -0500 | [diff] [blame] | 919 | int ret; |
| 920 | |
| 921 | ret = gbphy_runtime_get_sync(gbphy_dev); |
| 922 | if (ret) |
| 923 | gbphy_runtime_get_noresume(gbphy_dev); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 924 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 925 | mutex_lock(&gb_tty->mutex); |
| 926 | gb_tty->disconnected = true; |
| 927 | |
| 928 | wake_up_all(&gb_tty->wioctl); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 929 | mutex_unlock(&gb_tty->mutex); |
| 930 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 931 | tty = tty_port_tty_get(&gb_tty->port); |
| 932 | if (tty) { |
| 933 | tty_vhangup(tty); |
| 934 | tty_kref_put(tty); |
| 935 | } |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 936 | |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 937 | gb_connection_disable_rx(connection); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 938 | tty_unregister_device(gb_tty_driver, gb_tty->minor); |
| 939 | |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 940 | gb_connection_disable(connection); |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 941 | gb_connection_destroy(connection); |
Johan Hovold | 92dc0b1 | 2021-09-06 14:45:38 +0200 | [diff] [blame] | 942 | |
| 943 | tty_port_put(&gb_tty->port); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 944 | } |
| 945 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 946 | static int gb_tty_init(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 947 | { |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 948 | int retval = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 949 | |
Marti Bolivar | f8089c0 | 2014-09-05 23:56:09 -0400 | [diff] [blame] | 950 | gb_tty_driver = tty_alloc_driver(GB_NUM_MINORS, 0); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 951 | if (IS_ERR(gb_tty_driver)) { |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 952 | pr_err("Can not allocate tty driver\n"); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 953 | retval = -ENOMEM; |
| 954 | goto fail_unregister_dev; |
| 955 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 956 | |
| 957 | gb_tty_driver->driver_name = "gb"; |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 958 | gb_tty_driver->name = GB_NAME; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 959 | gb_tty_driver->major = 0; |
| 960 | gb_tty_driver->minor_start = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 961 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 962 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 963 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 964 | gb_tty_driver->init_termios = tty_std_termios; |
Gioh Kim | 461ab80 | 2017-02-09 17:30:11 +0100 | [diff] [blame] | 965 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | |
| 966 | CREAD | HUPCL | CLOCAL; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 967 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 968 | |
| 969 | retval = tty_register_driver(gb_tty_driver); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 970 | if (retval) { |
| 971 | pr_err("Can not register tty driver: %d\n", retval); |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 972 | goto fail_put_gb_tty; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 973 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 974 | |
Marti Bolivar | 7fabc884 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 975 | return 0; |
| 976 | |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 977 | fail_put_gb_tty: |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 978 | tty_driver_kref_put(gb_tty_driver); |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 979 | fail_unregister_dev: |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 980 | return retval; |
| 981 | } |
| 982 | |
Greg Kroah-Hartman | 4d98098 | 2014-10-27 17:42:45 +0800 | [diff] [blame] | 983 | static void gb_tty_exit(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 984 | { |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 985 | tty_unregister_driver(gb_tty_driver); |
Jiri Slaby | 9f90a4d | 2021-07-23 09:43:16 +0200 | [diff] [blame] | 986 | tty_driver_kref_put(gb_tty_driver); |
Greg Kroah-Hartman | 5c1ac69 | 2015-07-08 10:44:09 -0700 | [diff] [blame] | 987 | idr_destroy(&tty_minors); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 988 | } |
Alex Elder | 3689f97 | 2014-10-27 06:04:30 -0500 | [diff] [blame] | 989 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 990 | static const struct gbphy_device_id gb_uart_id_table[] = { |
| 991 | { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_UART) }, |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 992 | { }, |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 993 | }; |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 994 | MODULE_DEVICE_TABLE(gbphy, gb_uart_id_table); |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 995 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 996 | static struct gbphy_driver uart_driver = { |
Greg Kroah-Hartman | 7dbe1f4 | 2016-05-05 14:32:30 +0530 | [diff] [blame] | 997 | .name = "uart", |
| 998 | .probe = gb_uart_probe, |
| 999 | .remove = gb_uart_remove, |
| 1000 | .id_table = gb_uart_id_table, |
| 1001 | }; |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1002 | |
Viresh Kumar | 66b9e09 | 2016-05-09 18:15:11 +0530 | [diff] [blame] | 1003 | static int gb_uart_driver_init(void) |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1004 | { |
| 1005 | int ret; |
| 1006 | |
| 1007 | ret = gb_tty_init(); |
| 1008 | if (ret) |
| 1009 | return ret; |
| 1010 | |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 1011 | ret = gb_gbphy_register(&uart_driver); |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1012 | if (ret) { |
| 1013 | gb_tty_exit(); |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
| 1017 | return 0; |
| 1018 | } |
Viresh Kumar | 66b9e09 | 2016-05-09 18:15:11 +0530 | [diff] [blame] | 1019 | module_init(gb_uart_driver_init); |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1020 | |
Viresh Kumar | 66b9e09 | 2016-05-09 18:15:11 +0530 | [diff] [blame] | 1021 | static void gb_uart_driver_exit(void) |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1022 | { |
Sandeep Patil | e54b106 | 2016-05-19 08:52:39 -0700 | [diff] [blame] | 1023 | gb_gbphy_deregister(&uart_driver); |
Viresh Kumar | 73d292d | 2016-05-05 14:32:38 +0530 | [diff] [blame] | 1024 | gb_tty_exit(); |
| 1025 | } |
Viresh Kumar | 66b9e09 | 2016-05-09 18:15:11 +0530 | [diff] [blame] | 1026 | |
| 1027 | module_exit(gb_uart_driver_exit); |
| 1028 | MODULE_LICENSE("GPL v2"); |