Mauro Carvalho Chehab | 2fcfd31 | 2014-07-24 22:49:02 -0300 | [diff] [blame] | 1 | /* |
| 2 | handle au0828 IR remotes via linux kernel input layer. |
| 3 | |
| 4 | Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com> |
| 5 | Copyright (c) 2014 Samsung Electronics Co., Ltd. |
| 6 | |
| 7 | Based on em28xx-input.c. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/usb.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <media/rc-core.h> |
| 27 | |
Mauro Carvalho Chehab | ff346b0 | 2014-08-07 13:10:25 -0300 | [diff] [blame^] | 28 | static int disable_ir; |
| 29 | module_param(disable_ir, int, 0444); |
| 30 | MODULE_PARM_DESC(disable_ir, "disable infrared remote support"); |
| 31 | |
Mauro Carvalho Chehab | 2fcfd31 | 2014-07-24 22:49:02 -0300 | [diff] [blame] | 32 | #include "au0828.h" |
| 33 | |
| 34 | struct au0828_rc { |
| 35 | struct au0828_dev *dev; |
| 36 | struct rc_dev *rc; |
| 37 | char name[32]; |
| 38 | char phys[32]; |
| 39 | |
| 40 | /* poll decoder */ |
| 41 | int polling; |
| 42 | struct delayed_work work; |
| 43 | |
| 44 | /* i2c slave address of external device (if used) */ |
| 45 | u16 i2c_dev_addr; |
| 46 | |
| 47 | int (*get_key_i2c)(struct au0828_rc *ir); |
| 48 | }; |
| 49 | |
| 50 | /* |
| 51 | * AU8522 has a builtin IR receiver. Add functions to get IR from it |
| 52 | */ |
| 53 | |
| 54 | static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data) |
| 55 | { |
| 56 | int rc; |
| 57 | char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; |
| 58 | struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0, |
| 59 | .buf = buf, .len = sizeof(buf) }; |
| 60 | |
| 61 | rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1); |
| 62 | |
| 63 | if (rc < 0) |
| 64 | return rc; |
| 65 | |
| 66 | return (rc == 1) ? 0 : -EIO; |
| 67 | } |
| 68 | |
| 69 | static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val, |
| 70 | char *buf, int size) |
| 71 | { |
| 72 | int rc; |
| 73 | char obuf[3]; |
| 74 | struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0, |
| 75 | .buf = obuf, .len = 2 }, |
| 76 | { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD, |
| 77 | .buf = buf, .len = size } }; |
| 78 | |
| 79 | obuf[0] = 0x40 | reg >> 8; |
| 80 | obuf[1] = reg & 0xff; |
| 81 | if (val >= 0) { |
| 82 | obuf[2] = val; |
| 83 | msg[0].len++; |
| 84 | } |
| 85 | |
| 86 | rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2); |
| 87 | |
| 88 | if (rc < 0) |
| 89 | return rc; |
| 90 | |
| 91 | return (rc == 2) ? 0 : -EIO; |
| 92 | } |
| 93 | |
| 94 | static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value) |
| 95 | { |
| 96 | int rc; |
| 97 | char buf; |
| 98 | |
| 99 | rc = au8522_rc_read(ir, reg, -1, &buf, 1); |
| 100 | if (rc < 0) |
| 101 | return rc; |
| 102 | |
| 103 | buf = (buf & ~mask) | (value & mask); |
| 104 | |
| 105 | return au8522_rc_write(ir, reg, buf); |
| 106 | } |
| 107 | |
| 108 | #define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit)) |
| 109 | #define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0) |
| 110 | |
| 111 | /* Remote Controller time units */ |
| 112 | |
| 113 | #define AU8522_UNIT 200000 /* ns */ |
| 114 | #define NEC_START_SPACE (4500000 / AU8522_UNIT) |
| 115 | #define NEC_START_PULSE (562500 * 16) |
| 116 | #define RC5_START_SPACE (4 * AU8522_UNIT) |
| 117 | #define RC5_START_PULSE 888888 |
| 118 | |
| 119 | static int au0828_get_key_au8522(struct au0828_rc *ir) |
| 120 | { |
| 121 | unsigned char buf[40]; |
| 122 | DEFINE_IR_RAW_EVENT(rawir); |
| 123 | int i, j, rc; |
| 124 | int prv_bit, bit, width; |
| 125 | bool first = true; |
| 126 | |
| 127 | /* Check IR int */ |
| 128 | rc = au8522_rc_read(ir, 0xe1, -1, buf, 1); |
| 129 | if (rc < 0 || !(buf[0] & (1 << 4))) |
| 130 | return 0; |
| 131 | |
| 132 | /* Something arrived. Get the data */ |
| 133 | rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf)); |
| 134 | |
| 135 | |
| 136 | if (rc < 0) |
| 137 | return rc; |
| 138 | |
| 139 | /* Disable IR */ |
| 140 | au8522_rc_clear(ir, 0xe0, 1 << 4); |
| 141 | |
Mauro Carvalho Chehab | 2fcfd31 | 2014-07-24 22:49:02 -0300 | [diff] [blame] | 142 | /* Enable IR */ |
| 143 | au8522_rc_set(ir, 0xe0, 1 << 4); |
| 144 | |
| 145 | dprintk(16, "RC data received: %*ph\n", 40, buf); |
| 146 | |
| 147 | prv_bit = (buf[0] >> 7) & 0x01; |
| 148 | width = 0; |
| 149 | for (i = 0; i < sizeof(buf); i++) { |
| 150 | for (j = 7; j >= 0; j--) { |
| 151 | bit = (buf[i] >> j) & 0x01; |
| 152 | if (bit == prv_bit) { |
| 153 | width++; |
| 154 | continue; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Fix an au8522 bug: the first pulse event |
| 159 | * is lost. So, we need to fake it, based on the |
| 160 | * protocol. That means that not all raw decoders |
| 161 | * will work, as we need to add a hack for each |
| 162 | * protocol, based on the first space. |
| 163 | * So, we only support RC5 and NEC. |
| 164 | */ |
| 165 | |
| 166 | if (first) { |
| 167 | first = false; |
| 168 | |
| 169 | init_ir_raw_event(&rawir); |
| 170 | rawir.pulse = true; |
| 171 | if (width > NEC_START_SPACE - 2 && |
| 172 | width < NEC_START_SPACE + 2) { |
| 173 | /* NEC protocol */ |
| 174 | rawir.duration = NEC_START_PULSE; |
| 175 | dprintk(16, "Storing NEC start %s with duration %d", |
| 176 | rawir.pulse ? "pulse" : "space", |
| 177 | rawir.duration); |
| 178 | } else { |
| 179 | /* RC5 protocol */ |
| 180 | rawir.duration = RC5_START_PULSE; |
| 181 | dprintk(16, "Storing RC5 start %s with duration %d", |
| 182 | rawir.pulse ? "pulse" : "space", |
| 183 | rawir.duration); |
| 184 | } |
| 185 | ir_raw_event_store(ir->rc, &rawir); |
| 186 | } |
| 187 | |
| 188 | init_ir_raw_event(&rawir); |
| 189 | rawir.pulse = prv_bit ? false : true; |
| 190 | rawir.duration = AU8522_UNIT * width; |
| 191 | dprintk(16, "Storing %s with duration %d", |
| 192 | rawir.pulse ? "pulse" : "space", |
| 193 | rawir.duration); |
| 194 | ir_raw_event_store(ir->rc, &rawir); |
| 195 | |
| 196 | width = 1; |
| 197 | prv_bit = bit; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | init_ir_raw_event(&rawir); |
| 202 | rawir.pulse = prv_bit ? false : true; |
| 203 | rawir.duration = AU8522_UNIT * width; |
| 204 | dprintk(16, "Storing end %s with duration %d", |
| 205 | rawir.pulse ? "pulse" : "space", |
| 206 | rawir.duration); |
| 207 | ir_raw_event_store(ir->rc, &rawir); |
| 208 | |
| 209 | ir_raw_event_handle(ir->rc); |
| 210 | |
| 211 | return 1; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * Generic IR code |
| 216 | */ |
| 217 | |
| 218 | static void au0828_rc_work(struct work_struct *work) |
| 219 | { |
| 220 | struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work); |
| 221 | int rc; |
| 222 | |
| 223 | rc = ir->get_key_i2c(ir); |
| 224 | if (rc < 0) |
| 225 | pr_info("Error while getting RC scancode\n"); |
| 226 | |
| 227 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); |
| 228 | } |
| 229 | |
| 230 | static int au0828_rc_start(struct rc_dev *rc) |
| 231 | { |
| 232 | struct au0828_rc *ir = rc->priv; |
| 233 | |
| 234 | INIT_DELAYED_WORK(&ir->work, au0828_rc_work); |
| 235 | |
| 236 | /* Enable IR */ |
| 237 | au8522_rc_set(ir, 0xe0, 1 << 4); |
| 238 | |
| 239 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | static void au0828_rc_stop(struct rc_dev *rc) |
| 245 | { |
| 246 | struct au0828_rc *ir = rc->priv; |
| 247 | |
| 248 | /* Disable IR */ |
| 249 | au8522_rc_clear(ir, 0xe0, 1 << 4); |
| 250 | |
| 251 | cancel_delayed_work_sync(&ir->work); |
| 252 | } |
| 253 | |
| 254 | static int au0828_probe_i2c_ir(struct au0828_dev *dev) |
| 255 | { |
| 256 | int i = 0; |
| 257 | const unsigned short addr_list[] = { |
| 258 | 0x47, I2C_CLIENT_END |
| 259 | }; |
| 260 | |
| 261 | while (addr_list[i] != I2C_CLIENT_END) { |
| 262 | if (i2c_probe_func_quick_read(dev->i2c_client.adapter, |
| 263 | addr_list[i]) == 1) |
| 264 | return addr_list[i]; |
| 265 | i++; |
| 266 | } |
| 267 | |
| 268 | return -ENODEV; |
| 269 | } |
| 270 | |
| 271 | int au0828_rc_register(struct au0828_dev *dev) |
| 272 | { |
| 273 | struct au0828_rc *ir; |
| 274 | struct rc_dev *rc; |
| 275 | int err = -ENOMEM; |
| 276 | u16 i2c_rc_dev_addr = 0; |
| 277 | |
Mauro Carvalho Chehab | ff346b0 | 2014-08-07 13:10:25 -0300 | [diff] [blame^] | 278 | if (!dev->board.has_ir_i2c || disable_ir) |
Mauro Carvalho Chehab | 2fcfd31 | 2014-07-24 22:49:02 -0300 | [diff] [blame] | 279 | return 0; |
| 280 | |
| 281 | i2c_rc_dev_addr = au0828_probe_i2c_ir(dev); |
| 282 | if (!i2c_rc_dev_addr) |
| 283 | return -ENODEV; |
| 284 | |
| 285 | ir = kzalloc(sizeof(*ir), GFP_KERNEL); |
| 286 | rc = rc_allocate_device(); |
| 287 | if (!ir || !rc) |
| 288 | goto error; |
| 289 | |
| 290 | /* record handles to ourself */ |
| 291 | ir->dev = dev; |
| 292 | dev->ir = ir; |
| 293 | ir->rc = rc; |
| 294 | |
| 295 | rc->priv = ir; |
| 296 | rc->open = au0828_rc_start; |
| 297 | rc->close = au0828_rc_stop; |
| 298 | |
| 299 | if (dev->board.has_ir_i2c) { /* external i2c device */ |
| 300 | switch (dev->boardnr) { |
| 301 | case AU0828_BOARD_HAUPPAUGE_HVR950Q: |
| 302 | rc->map_name = RC_MAP_HAUPPAUGE; |
| 303 | ir->get_key_i2c = au0828_get_key_au8522; |
| 304 | break; |
| 305 | default: |
| 306 | err = -ENODEV; |
| 307 | goto error; |
| 308 | } |
| 309 | |
| 310 | ir->i2c_dev_addr = i2c_rc_dev_addr; |
| 311 | } |
| 312 | |
| 313 | /* This is how often we ask the chip for IR information */ |
| 314 | ir->polling = 100; /* ms */ |
| 315 | |
| 316 | /* init input device */ |
| 317 | snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)", |
| 318 | dev->board.name); |
| 319 | |
| 320 | usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys)); |
| 321 | strlcat(ir->phys, "/input0", sizeof(ir->phys)); |
| 322 | |
| 323 | rc->input_name = ir->name; |
| 324 | rc->input_phys = ir->phys; |
| 325 | rc->input_id.bustype = BUS_USB; |
| 326 | rc->input_id.version = 1; |
| 327 | rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor); |
| 328 | rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct); |
| 329 | rc->dev.parent = &dev->usbdev->dev; |
| 330 | rc->driver_name = "au0828-input"; |
| 331 | rc->driver_type = RC_DRIVER_IR_RAW; |
| 332 | rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5; |
| 333 | |
| 334 | /* all done */ |
| 335 | err = rc_register_device(rc); |
| 336 | if (err) |
| 337 | goto error; |
| 338 | |
| 339 | pr_info("Remote controller %s initalized\n", ir->name); |
| 340 | |
| 341 | return 0; |
| 342 | |
| 343 | error: |
| 344 | dev->ir = NULL; |
| 345 | rc_free_device(rc); |
| 346 | kfree(ir); |
| 347 | return err; |
| 348 | } |
| 349 | |
| 350 | void au0828_rc_unregister(struct au0828_dev *dev) |
| 351 | { |
| 352 | struct au0828_rc *ir = dev->ir; |
| 353 | |
| 354 | /* skip detach on non attached boards */ |
| 355 | if (!ir) |
| 356 | return; |
| 357 | |
| 358 | if (ir->rc) |
| 359 | rc_unregister_device(ir->rc); |
| 360 | |
| 361 | /* done */ |
| 362 | kfree(ir); |
| 363 | dev->ir = NULL; |
| 364 | } |
| 365 | |
| 366 | int au0828_rc_suspend(struct au0828_dev *dev) |
| 367 | { |
| 368 | struct au0828_rc *ir = dev->ir; |
| 369 | |
| 370 | if (!ir) |
| 371 | return 0; |
| 372 | |
| 373 | cancel_delayed_work_sync(&ir->work); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | int au0828_rc_resume(struct au0828_dev *dev) |
| 379 | { |
| 380 | struct au0828_rc *ir = dev->ir; |
| 381 | |
| 382 | if (!ir) |
| 383 | return 0; |
| 384 | |
| 385 | schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); |
| 386 | |
| 387 | return 0; |
| 388 | } |