Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 1 | /* |
| 2 | * vivid-cec.c - A Virtual Video Test Driver, cec emulation |
| 3 | * |
| 4 | * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you may redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 11 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 12 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 13 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 14 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 16 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 17 | * SOFTWARE. |
| 18 | */ |
| 19 | |
| 20 | #include <media/cec.h> |
| 21 | |
| 22 | #include "vivid-core.h" |
| 23 | #include "vivid-cec.h" |
| 24 | |
| 25 | void vivid_cec_bus_free_work(struct vivid_dev *dev) |
| 26 | { |
| 27 | spin_lock(&dev->cec_slock); |
| 28 | while (!list_empty(&dev->cec_work_list)) { |
| 29 | struct vivid_cec_work *cw = |
| 30 | list_first_entry(&dev->cec_work_list, |
| 31 | struct vivid_cec_work, list); |
| 32 | |
| 33 | spin_unlock(&dev->cec_slock); |
| 34 | cancel_delayed_work_sync(&cw->work); |
| 35 | spin_lock(&dev->cec_slock); |
| 36 | list_del(&cw->list); |
| 37 | cec_transmit_done(cw->adap, CEC_TX_STATUS_LOW_DRIVE, 0, 0, 1, 0); |
| 38 | kfree(cw); |
| 39 | } |
| 40 | spin_unlock(&dev->cec_slock); |
| 41 | } |
| 42 | |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 43 | static bool vivid_cec_find_dest_adap(struct vivid_dev *dev, |
| 44 | struct cec_adapter *adap, u8 dest) |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 45 | { |
| 46 | unsigned int i; |
| 47 | |
| 48 | if (dest >= 0xf) |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 49 | return false; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 50 | |
| 51 | if (adap != dev->cec_rx_adap && dev->cec_rx_adap && |
| 52 | dev->cec_rx_adap->is_configured && |
| 53 | cec_has_log_addr(dev->cec_rx_adap, dest)) |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 54 | return true; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 55 | |
| 56 | for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++) { |
| 57 | if (adap == dev->cec_tx_adap[i]) |
| 58 | continue; |
| 59 | if (!dev->cec_tx_adap[i]->is_configured) |
| 60 | continue; |
| 61 | if (cec_has_log_addr(dev->cec_tx_adap[i], dest)) |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 62 | return true; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 63 | } |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 64 | return false; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | static void vivid_cec_xfer_done_worker(struct work_struct *work) |
| 68 | { |
| 69 | struct vivid_cec_work *cw = |
| 70 | container_of(work, struct vivid_cec_work, work.work); |
| 71 | struct vivid_dev *dev = cw->dev; |
| 72 | struct cec_adapter *adap = cw->adap; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 73 | u8 dest = cec_msg_destination(&cw->msg); |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 74 | bool valid_dest; |
| 75 | unsigned int i; |
| 76 | |
| 77 | valid_dest = cec_msg_is_broadcast(&cw->msg); |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 78 | if (!valid_dest) |
| 79 | valid_dest = vivid_cec_find_dest_adap(dev, adap, dest); |
| 80 | |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 81 | cw->tx_status = valid_dest ? CEC_TX_STATUS_OK : CEC_TX_STATUS_NACK; |
| 82 | spin_lock(&dev->cec_slock); |
| 83 | dev->cec_xfer_time_jiffies = 0; |
| 84 | dev->cec_xfer_start_jiffies = 0; |
| 85 | list_del(&cw->list); |
| 86 | spin_unlock(&dev->cec_slock); |
| 87 | cec_transmit_done(cw->adap, cw->tx_status, 0, valid_dest ? 0 : 1, 0, 0); |
| 88 | |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 89 | /* Broadcast message */ |
| 90 | if (adap != dev->cec_rx_adap) |
| 91 | cec_received_msg(dev->cec_rx_adap, &cw->msg); |
| 92 | for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++) |
| 93 | if (adap != dev->cec_tx_adap[i]) |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 94 | cec_received_msg(dev->cec_tx_adap[i], &cw->msg); |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 95 | kfree(cw); |
| 96 | } |
| 97 | |
| 98 | static void vivid_cec_xfer_try_worker(struct work_struct *work) |
| 99 | { |
| 100 | struct vivid_cec_work *cw = |
| 101 | container_of(work, struct vivid_cec_work, work.work); |
| 102 | struct vivid_dev *dev = cw->dev; |
| 103 | |
| 104 | spin_lock(&dev->cec_slock); |
| 105 | if (dev->cec_xfer_time_jiffies) { |
| 106 | list_del(&cw->list); |
| 107 | spin_unlock(&dev->cec_slock); |
| 108 | cec_transmit_done(cw->adap, CEC_TX_STATUS_ARB_LOST, 1, 0, 0, 0); |
| 109 | kfree(cw); |
| 110 | } else { |
| 111 | INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker); |
| 112 | dev->cec_xfer_start_jiffies = jiffies; |
| 113 | dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs); |
| 114 | spin_unlock(&dev->cec_slock); |
| 115 | schedule_delayed_work(&cw->work, dev->cec_xfer_time_jiffies); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | static int vivid_cec_adap_enable(struct cec_adapter *adap, bool enable) |
| 120 | { |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static int vivid_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr) |
| 125 | { |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * One data bit takes 2400 us, each byte needs 10 bits so that's 24000 us |
| 131 | * per byte. |
| 132 | */ |
| 133 | #define USECS_PER_BYTE 24000 |
| 134 | |
| 135 | static int vivid_cec_adap_transmit(struct cec_adapter *adap, u8 attempts, |
| 136 | u32 signal_free_time, struct cec_msg *msg) |
| 137 | { |
| 138 | struct vivid_dev *dev = adap->priv; |
| 139 | struct vivid_cec_work *cw = kzalloc(sizeof(*cw), GFP_KERNEL); |
| 140 | long delta_jiffies = 0; |
| 141 | |
| 142 | if (cw == NULL) |
| 143 | return -ENOMEM; |
| 144 | cw->dev = dev; |
| 145 | cw->adap = adap; |
| 146 | cw->usecs = CEC_FREE_TIME_TO_USEC(signal_free_time) + |
| 147 | msg->len * USECS_PER_BYTE; |
| 148 | cw->msg = *msg; |
| 149 | |
| 150 | spin_lock(&dev->cec_slock); |
| 151 | list_add(&cw->list, &dev->cec_work_list); |
| 152 | if (dev->cec_xfer_time_jiffies == 0) { |
| 153 | INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker); |
| 154 | dev->cec_xfer_start_jiffies = jiffies; |
| 155 | dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs); |
| 156 | delta_jiffies = dev->cec_xfer_time_jiffies; |
| 157 | } else { |
| 158 | INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_try_worker); |
| 159 | delta_jiffies = dev->cec_xfer_start_jiffies + |
| 160 | dev->cec_xfer_time_jiffies - jiffies; |
| 161 | } |
| 162 | spin_unlock(&dev->cec_slock); |
| 163 | schedule_delayed_work(&cw->work, delta_jiffies < 0 ? 0 : delta_jiffies); |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static int vivid_received(struct cec_adapter *adap, struct cec_msg *msg) |
| 168 | { |
| 169 | struct vivid_dev *dev = adap->priv; |
| 170 | struct cec_msg reply; |
| 171 | u8 dest = cec_msg_destination(msg); |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 172 | u8 disp_ctl; |
| 173 | char osd[14]; |
| 174 | |
| 175 | if (cec_msg_is_broadcast(msg)) |
| 176 | dest = adap->log_addrs.log_addr[0]; |
| 177 | cec_msg_init(&reply, dest, cec_msg_initiator(msg)); |
| 178 | |
| 179 | switch (cec_msg_opcode(msg)) { |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 180 | case CEC_MSG_SET_OSD_STRING: |
| 181 | if (!cec_is_sink(adap)) |
| 182 | return -ENOMSG; |
| 183 | cec_ops_set_osd_string(msg, &disp_ctl, osd); |
| 184 | switch (disp_ctl) { |
| 185 | case CEC_OP_DISP_CTL_DEFAULT: |
| 186 | strcpy(dev->osd, osd); |
| 187 | dev->osd_jiffies = jiffies; |
| 188 | break; |
| 189 | case CEC_OP_DISP_CTL_UNTIL_CLEARED: |
| 190 | strcpy(dev->osd, osd); |
| 191 | dev->osd_jiffies = 0; |
| 192 | break; |
| 193 | case CEC_OP_DISP_CTL_CLEAR: |
| 194 | dev->osd[0] = 0; |
| 195 | dev->osd_jiffies = 0; |
| 196 | break; |
| 197 | default: |
| 198 | cec_msg_feature_abort(&reply, cec_msg_opcode(msg), |
| 199 | CEC_OP_ABORT_INVALID_OP); |
| 200 | cec_transmit_msg(adap, &reply, false); |
| 201 | break; |
| 202 | } |
| 203 | break; |
| 204 | default: |
| 205 | return -ENOMSG; |
| 206 | } |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static const struct cec_adap_ops vivid_cec_adap_ops = { |
| 211 | .adap_enable = vivid_cec_adap_enable, |
| 212 | .adap_log_addr = vivid_cec_adap_log_addr, |
| 213 | .adap_transmit = vivid_cec_adap_transmit, |
| 214 | .received = vivid_received, |
| 215 | }; |
| 216 | |
| 217 | struct cec_adapter *vivid_cec_alloc_adap(struct vivid_dev *dev, |
| 218 | unsigned int idx, |
| 219 | struct device *parent, |
| 220 | bool is_source) |
| 221 | { |
| 222 | char name[sizeof(dev->vid_out_dev.name) + 2]; |
| 223 | u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS | |
Hans Verkuil | 8350502 | 2016-07-16 10:49:36 -0300 | [diff] [blame] | 224 | CEC_CAP_PASSTHROUGH | CEC_CAP_RC | CEC_CAP_MONITOR_ALL; |
Hans Verkuil | 6f8adea | 2016-02-05 12:44:21 -0200 | [diff] [blame] | 225 | |
| 226 | snprintf(name, sizeof(name), "%s%d", |
| 227 | is_source ? dev->vid_out_dev.name : dev->vid_cap_dev.name, |
| 228 | idx); |
| 229 | return cec_allocate_adapter(&vivid_cec_adap_ops, dev, |
| 230 | name, caps, 1, parent); |
| 231 | } |