Pavan Savoy | d0088ce | 2010-04-08 13:16:54 -0500 | [diff] [blame^] | 1 | /* |
| 2 | * Shared Transport Line discipline driver Core |
| 3 | * Init Manager module responsible for GPIO control |
| 4 | * and firmware download |
| 5 | * Copyright (C) 2009 Texas Instruments |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #define pr_fmt(fmt) "(stk) :" fmt |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/jiffies.h> |
| 25 | #include <linux/firmware.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/wait.h> |
| 28 | #include <linux/gpio.h> |
| 29 | |
| 30 | #include <linux/sched.h> |
| 31 | |
| 32 | #include "st_kim.h" |
| 33 | /* understand BT events for fw response */ |
| 34 | #include <net/bluetooth/bluetooth.h> |
| 35 | #include <net/bluetooth/hci_core.h> |
| 36 | #include <net/bluetooth/hci.h> |
| 37 | |
| 38 | |
| 39 | static int kim_probe(struct platform_device *pdev); |
| 40 | static int kim_remove(struct platform_device *pdev); |
| 41 | |
| 42 | /* KIM platform device driver structure */ |
| 43 | static struct platform_driver kim_platform_driver = { |
| 44 | .probe = kim_probe, |
| 45 | .remove = kim_remove, |
| 46 | /* TODO: ST driver power management during suspend/resume ? |
| 47 | */ |
| 48 | #if 0 |
| 49 | .suspend = kim_suspend, |
| 50 | .resume = kim_resume, |
| 51 | #endif |
| 52 | .driver = { |
| 53 | .name = "kim", |
| 54 | .owner = THIS_MODULE, |
| 55 | }, |
| 56 | }; |
| 57 | |
| 58 | #ifndef LEGACY_RFKILL_SUPPORT |
| 59 | static ssize_t show_pid(struct device *dev, struct device_attribute |
| 60 | *attr, char *buf); |
| 61 | static ssize_t store_pid(struct device *dev, struct device_attribute |
| 62 | *devattr, char *buf, size_t count); |
| 63 | static ssize_t show_list(struct device *dev, struct device_attribute |
| 64 | *attr, char *buf); |
| 65 | |
| 66 | /* structures specific for sysfs entries */ |
| 67 | static struct kobj_attribute pid_attr = |
| 68 | __ATTR(pid, 0644, (void *)show_pid, (void *)store_pid); |
| 69 | |
| 70 | static struct kobj_attribute list_protocols = |
| 71 | __ATTR(protocols, 0444, (void *)show_list, NULL); |
| 72 | |
| 73 | static struct attribute *uim_attrs[] = { |
| 74 | &pid_attr.attr, |
| 75 | /* add more debug sysfs entries */ |
| 76 | &list_protocols.attr, |
| 77 | NULL, |
| 78 | }; |
| 79 | |
| 80 | static struct attribute_group uim_attr_grp = { |
| 81 | .attrs = uim_attrs, |
| 82 | }; |
| 83 | #else |
| 84 | static int kim_toggle_radio(void*, bool); |
| 85 | static const struct rfkill_ops kim_rfkill_ops = { |
| 86 | .set_block = kim_toggle_radio, |
| 87 | }; |
| 88 | #endif /* LEGACY_RFKILL_SUPPORT */ |
| 89 | |
| 90 | /* strings to be used for rfkill entries and by |
| 91 | * ST Core to be used for sysfs debug entry |
| 92 | */ |
| 93 | #define PROTO_ENTRY(type, name) name |
| 94 | const unsigned char *protocol_names[] = { |
| 95 | PROTO_ENTRY(ST_BT, "Bluetooth"), |
| 96 | PROTO_ENTRY(ST_FM, "FM"), |
| 97 | PROTO_ENTRY(ST_GPS, "GPS"), |
| 98 | }; |
| 99 | |
| 100 | struct kim_data_s *kim_gdata; |
| 101 | |
| 102 | /**********************************************************************/ |
| 103 | /* internal functions */ |
| 104 | |
| 105 | /* |
| 106 | * function to return whether the firmware response was proper |
| 107 | * in case of error don't complete so that waiting for proper |
| 108 | * response times out |
| 109 | */ |
| 110 | void validate_firmware_response(struct sk_buff *skb) |
| 111 | { |
| 112 | if (unlikely(skb->data[5] != 0)) { |
| 113 | pr_err("no proper response during fw download"); |
| 114 | pr_err("data6 %x", skb->data[5]); |
| 115 | return; /* keep waiting for the proper response */ |
| 116 | } |
| 117 | /* becos of all the script being downloaded */ |
| 118 | complete_all(&kim_gdata->kim_rcvd); |
| 119 | kfree_skb(skb); |
| 120 | } |
| 121 | |
| 122 | /* check for data len received inside kim_int_recv |
| 123 | * most often hit the last case to update state to waiting for data |
| 124 | */ |
| 125 | static inline int kim_check_data_len(int len) |
| 126 | { |
| 127 | register int room = skb_tailroom(kim_gdata->rx_skb); |
| 128 | |
| 129 | pr_info("len %d room %d", len, room); |
| 130 | |
| 131 | if (!len) { |
| 132 | validate_firmware_response(kim_gdata->rx_skb); |
| 133 | } else if (len > room) { |
| 134 | /* Received packet's payload length is larger. |
| 135 | * We can't accommodate it in created skb. |
| 136 | */ |
| 137 | pr_err("Data length is too large len %d room %d", len, |
| 138 | room); |
| 139 | kfree_skb(kim_gdata->rx_skb); |
| 140 | } else { |
| 141 | /* Packet header has non-zero payload length and |
| 142 | * we have enough space in created skb. Lets read |
| 143 | * payload data */ |
| 144 | kim_gdata->rx_state = ST_BT_W4_DATA; |
| 145 | kim_gdata->rx_count = len; |
| 146 | return len; |
| 147 | } |
| 148 | |
| 149 | /* Change ST LL state to continue to process next |
| 150 | * packet */ |
| 151 | kim_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 152 | kim_gdata->rx_skb = NULL; |
| 153 | kim_gdata->rx_count = 0; |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /* receive function called during firmware download |
| 159 | * - firmware download responses on different UART drivers |
| 160 | * have been observed to come in bursts of different |
| 161 | * tty_receive and hence the logic |
| 162 | */ |
| 163 | void kim_int_recv(const unsigned char *data, long count) |
| 164 | { |
| 165 | register char *ptr; |
| 166 | struct hci_event_hdr *eh; |
| 167 | register int len = 0, type = 0; |
| 168 | |
| 169 | pr_info("%s", __func__); |
| 170 | /* Decode received bytes here */ |
| 171 | ptr = (char *)data; |
| 172 | if (unlikely(ptr == NULL)) { |
| 173 | pr_err(" received null from TTY "); |
| 174 | return; |
| 175 | } |
| 176 | while (count) { |
| 177 | if (kim_gdata->rx_count) { |
| 178 | len = min_t(unsigned int, kim_gdata->rx_count, count); |
| 179 | memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len); |
| 180 | kim_gdata->rx_count -= len; |
| 181 | count -= len; |
| 182 | ptr += len; |
| 183 | |
| 184 | if (kim_gdata->rx_count) |
| 185 | continue; |
| 186 | |
| 187 | /* Check ST RX state machine , where are we? */ |
| 188 | switch (kim_gdata->rx_state) { |
| 189 | /* Waiting for complete packet ? */ |
| 190 | case ST_BT_W4_DATA: |
| 191 | pr_info("Complete pkt received"); |
| 192 | validate_firmware_response(kim_gdata->rx_skb); |
| 193 | kim_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 194 | kim_gdata->rx_skb = NULL; |
| 195 | continue; |
| 196 | /* Waiting for Bluetooth event header ? */ |
| 197 | case ST_BT_W4_EVENT_HDR: |
| 198 | eh = (struct hci_event_hdr *)kim_gdata-> |
| 199 | rx_skb->data; |
| 200 | pr_info("Event header: evt 0x%2.2x" |
| 201 | "plen %d", eh->evt, eh->plen); |
| 202 | kim_check_data_len(eh->plen); |
| 203 | continue; |
| 204 | } /* end of switch */ |
| 205 | } /* end of if rx_state */ |
| 206 | switch (*ptr) { |
| 207 | /* Bluetooth event packet? */ |
| 208 | case HCI_EVENT_PKT: |
| 209 | pr_info("Event packet"); |
| 210 | kim_gdata->rx_state = ST_BT_W4_EVENT_HDR; |
| 211 | kim_gdata->rx_count = HCI_EVENT_HDR_SIZE; |
| 212 | type = HCI_EVENT_PKT; |
| 213 | break; |
| 214 | default: |
| 215 | pr_info("unknown packet"); |
| 216 | ptr++; |
| 217 | count--; |
| 218 | continue; |
| 219 | } /* end of switch *ptr */ |
| 220 | ptr++; |
| 221 | count--; |
| 222 | kim_gdata->rx_skb = |
| 223 | bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); |
| 224 | if (!kim_gdata->rx_skb) { |
| 225 | pr_err("can't allocate mem for new packet"); |
| 226 | kim_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 227 | kim_gdata->rx_count = 0; |
| 228 | return; |
| 229 | } /* not necessary in this case */ |
| 230 | bt_cb(kim_gdata->rx_skb)->pkt_type = type; |
| 231 | } /* end of while count */ |
| 232 | pr_info("done %s", __func__); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | static long read_local_version(char *bts_scr_name) |
| 237 | { |
| 238 | unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0; |
| 239 | char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 }; |
| 240 | |
| 241 | pr_info("%s", __func__); |
| 242 | |
| 243 | INIT_COMPLETION(kim_gdata->kim_rcvd); |
| 244 | if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) { |
| 245 | pr_err("kim: couldn't write 4 bytes"); |
| 246 | return ST_ERR_FAILURE; |
| 247 | } |
| 248 | |
| 249 | if (!wait_for_completion_timeout |
| 250 | (&kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME))) { |
| 251 | pr_err(" waiting for ver info- timed out "); |
| 252 | return ST_ERR_FAILURE; |
| 253 | } |
| 254 | |
| 255 | version = |
| 256 | MAKEWORD(kim_gdata->resp_buffer[13], kim_gdata->resp_buffer[14]); |
| 257 | chip = (version & 0x7C00) >> 10; |
| 258 | min_ver = (version & 0x007F); |
| 259 | maj_ver = (version & 0x0380) >> 7; |
| 260 | |
| 261 | if (version & 0x8000) |
| 262 | maj_ver |= 0x0008; |
| 263 | |
| 264 | sprintf(bts_scr_name, "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver); |
| 265 | pr_info("%s", bts_scr_name); |
| 266 | return ST_SUCCESS; |
| 267 | } |
| 268 | |
| 269 | /* internal function which parses through the .bts firmware script file |
| 270 | * intreprets SEND, DELAY actions only as of now |
| 271 | */ |
| 272 | static long download_firmware(void) |
| 273 | { |
| 274 | long err = ST_SUCCESS; |
| 275 | long len = 0; |
| 276 | register unsigned char *ptr = NULL; |
| 277 | register unsigned char *action_ptr = NULL; |
| 278 | unsigned char bts_scr_name[30] = { 0 }; /* 30 char long bts scr name? */ |
| 279 | |
| 280 | pr_info("%s", __func__); |
| 281 | |
| 282 | err = read_local_version(bts_scr_name); |
| 283 | if (err != ST_SUCCESS) { |
| 284 | pr_err("kim: failed to read local ver"); |
| 285 | return err; |
| 286 | } |
| 287 | err = |
| 288 | request_firmware(&kim_gdata->fw_entry, bts_scr_name, |
| 289 | &kim_gdata->kim_pdev->dev); |
| 290 | if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) || |
| 291 | (kim_gdata->fw_entry->size == 0))) { |
| 292 | pr_err(" request_firmware failed(errno %ld) for %s", err, |
| 293 | bts_scr_name); |
| 294 | return ST_ERR_FAILURE; |
| 295 | } |
| 296 | ptr = (void *)kim_gdata->fw_entry->data; |
| 297 | len = kim_gdata->fw_entry->size; |
| 298 | /* bts_header to remove out magic number and |
| 299 | * version |
| 300 | */ |
| 301 | ptr += sizeof(struct bts_header); |
| 302 | len -= sizeof(struct bts_header); |
| 303 | |
| 304 | while (len > 0 && ptr) { |
| 305 | pr_info(" action size %d, type %d ", |
| 306 | ((struct bts_action *)ptr)->size, |
| 307 | ((struct bts_action *)ptr)->type); |
| 308 | |
| 309 | switch (((struct bts_action *)ptr)->type) { |
| 310 | case ACTION_SEND_COMMAND: /* action send */ |
| 311 | action_ptr = &(((struct bts_action *)ptr)->data[0]); |
| 312 | if (unlikely |
| 313 | (((struct hci_command *)action_ptr)->opcode == |
| 314 | 0xFF36)) { |
| 315 | /* ignore remote change |
| 316 | * baud rate HCI VS command */ |
| 317 | pr_err |
| 318 | (" change remote baud\ |
| 319 | rate command in firmware"); |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | INIT_COMPLETION(kim_gdata->kim_rcvd); |
| 324 | err = st_int_write(kim_gdata->core_data, |
| 325 | ((struct bts_action_send *)action_ptr)->data, |
| 326 | ((struct bts_action *)ptr)->size); |
| 327 | if (unlikely(err < 0)) { |
| 328 | release_firmware(kim_gdata->fw_entry); |
| 329 | return ST_ERR_FAILURE; |
| 330 | } |
| 331 | if (!wait_for_completion_timeout |
| 332 | (&kim_gdata->kim_rcvd, |
| 333 | msecs_to_jiffies(CMD_RESP_TIME))) { |
| 334 | pr_err |
| 335 | (" response timeout during fw download "); |
| 336 | /* timed out */ |
| 337 | release_firmware(kim_gdata->fw_entry); |
| 338 | return ST_ERR_FAILURE; |
| 339 | } |
| 340 | break; |
| 341 | case ACTION_DELAY: /* sleep */ |
| 342 | pr_info("sleep command in scr"); |
| 343 | action_ptr = &(((struct bts_action *)ptr)->data[0]); |
| 344 | mdelay(((struct bts_action_delay *)action_ptr)->msec); |
| 345 | break; |
| 346 | } |
| 347 | len = |
| 348 | len - (sizeof(struct bts_action) + |
| 349 | ((struct bts_action *)ptr)->size); |
| 350 | ptr = |
| 351 | ptr + sizeof(struct bts_action) + |
| 352 | ((struct bts_action *)ptr)->size; |
| 353 | } |
| 354 | /* fw download complete */ |
| 355 | release_firmware(kim_gdata->fw_entry); |
| 356 | return ST_SUCCESS; |
| 357 | } |
| 358 | |
| 359 | /**********************************************************************/ |
| 360 | /* functions called from ST core */ |
| 361 | |
| 362 | /* function to toggle the GPIO |
| 363 | * needs to know whether the GPIO is active high or active low |
| 364 | */ |
| 365 | void st_kim_chip_toggle(enum proto_type type, enum kim_gpio_state state) |
| 366 | { |
| 367 | pr_info(" %s ", __func__); |
| 368 | |
| 369 | if (kim_gdata->gpios[type] == -1) { |
| 370 | pr_info(" gpio not requested for protocol %s", |
| 371 | protocol_names[type]); |
| 372 | return; |
| 373 | } |
| 374 | switch (type) { |
| 375 | case ST_BT: |
| 376 | /*Do Nothing */ |
| 377 | break; |
| 378 | |
| 379 | case ST_FM: |
| 380 | if (state == KIM_GPIO_ACTIVE) |
| 381 | gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_LOW); |
| 382 | else |
| 383 | gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_HIGH); |
| 384 | break; |
| 385 | |
| 386 | case ST_GPS: |
| 387 | if (state == KIM_GPIO_ACTIVE) |
| 388 | gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_HIGH); |
| 389 | else |
| 390 | gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_LOW); |
| 391 | break; |
| 392 | |
| 393 | case ST_MAX: |
| 394 | default: |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | return; |
| 399 | } |
| 400 | |
| 401 | /* called from ST Core, when REG_IN_PROGRESS (registration in progress) |
| 402 | * can be because of |
| 403 | * 1. response to read local version |
| 404 | * 2. during send/recv's of firmware download |
| 405 | */ |
| 406 | void st_kim_recv(void *disc_data, const unsigned char *data, long count) |
| 407 | { |
| 408 | pr_info(" %s ", __func__); |
| 409 | /* copy to local buffer */ |
| 410 | if (unlikely(data[4] == 0x01 && data[5] == 0x10 && data[0] == 0x04)) { |
| 411 | /* must be the read_ver_cmd */ |
| 412 | memcpy(kim_gdata->resp_buffer, data, count); |
| 413 | complete_all(&kim_gdata->kim_rcvd); |
| 414 | return; |
| 415 | } else { |
| 416 | kim_int_recv(data, count); |
| 417 | /* either completes or times out */ |
| 418 | } |
| 419 | return; |
| 420 | } |
| 421 | |
| 422 | /* to signal completion of line discipline installation |
| 423 | * called from ST Core, upon tty_open |
| 424 | */ |
| 425 | void st_kim_complete(void) |
| 426 | { |
| 427 | complete(&kim_gdata->ldisc_installed); |
| 428 | } |
| 429 | |
| 430 | /* called from ST Core upon 1st registration |
| 431 | */ |
| 432 | long st_kim_start(void) |
| 433 | { |
| 434 | long err = ST_SUCCESS; |
| 435 | long retry = POR_RETRY_COUNT; |
| 436 | pr_info(" %s", __func__); |
| 437 | |
| 438 | do { |
| 439 | #ifdef LEGACY_RFKILL_SUPPORT |
| 440 | /* TODO: this is only because rfkill sub-system |
| 441 | * doesn't send events to user-space if the state |
| 442 | * isn't changed |
| 443 | */ |
| 444 | rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1); |
| 445 | #endif |
| 446 | /* Configure BT nShutdown to HIGH state */ |
| 447 | gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW); |
| 448 | mdelay(5); /* FIXME: a proper toggle */ |
| 449 | gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH); |
| 450 | mdelay(100); |
| 451 | /* re-initialize the completion */ |
| 452 | INIT_COMPLETION(kim_gdata->ldisc_installed); |
| 453 | #ifndef LEGACY_RFKILL_SUPPORT |
| 454 | /* send signal to UIM */ |
| 455 | err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 0); |
| 456 | if (err != 0) { |
| 457 | pr_info(" sending SIGUSR2 to uim failed %ld", err); |
| 458 | err = ST_ERR_FAILURE; |
| 459 | continue; |
| 460 | } |
| 461 | #else |
| 462 | /* unblock and send event to UIM via /dev/rfkill */ |
| 463 | rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 0); |
| 464 | #endif |
| 465 | /* wait for ldisc to be installed */ |
| 466 | err = wait_for_completion_timeout(&kim_gdata->ldisc_installed, |
| 467 | msecs_to_jiffies(LDISC_TIME)); |
| 468 | if (!err) { /* timeout */ |
| 469 | pr_err("line disc installation timed out "); |
| 470 | err = ST_ERR_FAILURE; |
| 471 | continue; |
| 472 | } else { |
| 473 | /* ldisc installed now */ |
| 474 | pr_info(" line discipline installed "); |
| 475 | err = download_firmware(); |
| 476 | if (err != ST_SUCCESS) { |
| 477 | pr_err("download firmware failed"); |
| 478 | continue; |
| 479 | } else { /* on success don't retry */ |
| 480 | break; |
| 481 | } |
| 482 | } |
| 483 | } while (retry--); |
| 484 | return err; |
| 485 | } |
| 486 | |
| 487 | /* called from ST Core, on the last un-registration |
| 488 | */ |
| 489 | long st_kim_stop(void) |
| 490 | { |
| 491 | long err = ST_SUCCESS; |
| 492 | |
| 493 | INIT_COMPLETION(kim_gdata->ldisc_installed); |
| 494 | #ifndef LEGACY_RFKILL_SUPPORT |
| 495 | /* send signal to UIM */ |
| 496 | err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 1); |
| 497 | if (err != 0) { |
| 498 | pr_err("sending SIGUSR2 to uim failed %ld", err); |
| 499 | return ST_ERR_FAILURE; |
| 500 | } |
| 501 | #else |
| 502 | /* set BT rfkill to be blocked */ |
| 503 | err = rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1); |
| 504 | #endif |
| 505 | |
| 506 | /* wait for ldisc to be un-installed */ |
| 507 | err = wait_for_completion_timeout(&kim_gdata->ldisc_installed, |
| 508 | msecs_to_jiffies(LDISC_TIME)); |
| 509 | if (!err) { /* timeout */ |
| 510 | pr_err(" timed out waiting for ldisc to be un-installed"); |
| 511 | return ST_ERR_FAILURE; |
| 512 | } |
| 513 | |
| 514 | /* By default configure BT nShutdown to LOW state */ |
| 515 | gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW); |
| 516 | mdelay(1); |
| 517 | gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH); |
| 518 | mdelay(1); |
| 519 | gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW); |
| 520 | return err; |
| 521 | } |
| 522 | |
| 523 | /**********************************************************************/ |
| 524 | /* functions called from subsystems */ |
| 525 | |
| 526 | #ifndef LEGACY_RFKILL_SUPPORT |
| 527 | /* called when sysfs entry is written to */ |
| 528 | static ssize_t store_pid(struct device *dev, struct device_attribute |
| 529 | *devattr, char *buf, size_t count) |
| 530 | { |
| 531 | pr_info("%s: pid %s ", __func__, buf); |
| 532 | sscanf(buf, "%ld", &kim_gdata->uim_pid); |
| 533 | /* to be made use by kim_start to signal SIGUSR2 |
| 534 | */ |
| 535 | return strlen(buf); |
| 536 | } |
| 537 | |
| 538 | /* called when sysfs entry is read from */ |
| 539 | static ssize_t show_pid(struct device *dev, struct device_attribute |
| 540 | *attr, char *buf) |
| 541 | { |
| 542 | sprintf(buf, "%ld", kim_gdata->uim_pid); |
| 543 | return strlen(buf); |
| 544 | } |
| 545 | |
| 546 | /* called when sysfs entry is read from */ |
| 547 | static ssize_t show_list(struct device *dev, struct device_attribute |
| 548 | *attr, char *buf) |
| 549 | { |
| 550 | kim_st_list_protocols(kim_gdata->core_data, buf); |
| 551 | return strlen(buf); |
| 552 | } |
| 553 | |
| 554 | #else /* LEGACY_RFKILL_SUPPORT */ |
| 555 | |
| 556 | /* function called from rfkill subsystem, when someone from |
| 557 | * user space would write 0/1 on the sysfs entry |
| 558 | * /sys/class/rfkill/rfkill0,1,3/state |
| 559 | */ |
| 560 | static int kim_toggle_radio(void *data, bool blocked) |
| 561 | { |
| 562 | enum proto_type type = *((enum proto_type *)data); |
| 563 | pr_info(" %s: %d ", __func__, type); |
| 564 | |
| 565 | switch (type) { |
| 566 | case ST_BT: |
| 567 | /* do nothing */ |
| 568 | break; |
| 569 | case ST_FM: |
| 570 | case ST_GPS: |
| 571 | if (blocked) |
| 572 | st_kim_chip_toggle(type, KIM_GPIO_INACTIVE); |
| 573 | else |
| 574 | st_kim_chip_toggle(type, KIM_GPIO_ACTIVE); |
| 575 | break; |
| 576 | case ST_MAX: |
| 577 | pr_err(" wrong proto type "); |
| 578 | break; |
| 579 | } |
| 580 | return ST_SUCCESS; |
| 581 | } |
| 582 | |
| 583 | #endif /* LEGACY_RFKILL_SUPPORT */ |
| 584 | |
| 585 | void st_kim_ref(struct st_data_s **core_data) |
| 586 | { |
| 587 | *core_data = kim_gdata->core_data; |
| 588 | } |
| 589 | |
| 590 | /**********************************************************************/ |
| 591 | /* functions called from platform device driver subsystem |
| 592 | * need to have a relevant platform device entry in the platform's |
| 593 | * board-*.c file |
| 594 | */ |
| 595 | |
| 596 | static int kim_probe(struct platform_device *pdev) |
| 597 | { |
| 598 | long status; |
| 599 | long proto; |
| 600 | long *gpios = pdev->dev.platform_data; |
| 601 | |
| 602 | status = st_core_init(&kim_gdata->core_data); |
| 603 | if (status != 0) { |
| 604 | pr_err(" ST core init failed"); |
| 605 | return ST_ERR_FAILURE; |
| 606 | } |
| 607 | |
| 608 | for (proto = 0; proto < ST_MAX; proto++) { |
| 609 | kim_gdata->gpios[proto] = gpios[proto]; |
| 610 | pr_info(" %ld gpio to be requested", gpios[proto]); |
| 611 | } |
| 612 | |
| 613 | for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) { |
| 614 | /* Claim the Bluetooth/FM/GPIO |
| 615 | * nShutdown gpio from the system |
| 616 | */ |
| 617 | status = gpio_request(gpios[proto], "kim"); |
| 618 | if (unlikely(status)) { |
| 619 | pr_err(" gpio %ld request failed ", gpios[proto]); |
| 620 | proto -= 1; |
| 621 | while (proto >= 0) { |
| 622 | if (gpios[proto] != -1) |
| 623 | gpio_free(gpios[proto]); |
| 624 | } |
| 625 | return status; |
| 626 | } |
| 627 | |
| 628 | /* Configure nShutdown GPIO as output=0 */ |
| 629 | status = |
| 630 | gpio_direction_output(gpios[proto], 0); |
| 631 | if (unlikely(status)) { |
| 632 | pr_err(" unable to configure gpio %ld", |
| 633 | gpios[proto]); |
| 634 | proto -= 1; |
| 635 | while (proto >= 0) { |
| 636 | if (gpios[proto] != -1) |
| 637 | gpio_free(gpios[proto]); |
| 638 | } |
| 639 | return status; |
| 640 | } |
| 641 | } |
| 642 | #ifndef LEGACY_RFKILL_SUPPORT |
| 643 | /* pdev to contain BT, FM and GPS enable/N-Shutdown GPIOs |
| 644 | * execute request_gpio, set output direction |
| 645 | */ |
| 646 | kim_gdata->kim_kobj = kobject_create_and_add("uim", NULL); |
| 647 | /* create the sysfs entry for UIM to put in pid */ |
| 648 | if (sysfs_create_group(kim_gdata->kim_kobj, &uim_attr_grp)) { |
| 649 | pr_err(" sysfs entry creation failed"); |
| 650 | kobject_put(kim_gdata->kim_kobj); |
| 651 | /* free requested GPIOs and fail probe */ |
| 652 | for (proto = ST_BT; proto < ST_MAX; proto++) { |
| 653 | if (gpios[proto] != -1) |
| 654 | gpio_free(gpios[proto]); |
| 655 | } |
| 656 | return -1; /* fail insmod */ |
| 657 | } |
| 658 | pr_info(" sysfs entry created "); |
| 659 | #endif |
| 660 | /* get reference of pdev for request_firmware |
| 661 | */ |
| 662 | kim_gdata->kim_pdev = pdev; |
| 663 | init_completion(&kim_gdata->kim_rcvd); |
| 664 | init_completion(&kim_gdata->ldisc_installed); |
| 665 | #ifdef LEGACY_RFKILL_SUPPORT |
| 666 | for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) { |
| 667 | /* TODO: should all types be rfkill_type_bt ? */ |
| 668 | kim_gdata->rf_protos[proto] = proto; |
| 669 | kim_gdata->rfkill[proto] = rfkill_alloc(protocol_names[proto], |
| 670 | &pdev->dev, RFKILL_TYPE_BLUETOOTH, |
| 671 | &kim_rfkill_ops, &kim_gdata->rf_protos[proto]); |
| 672 | if (kim_gdata->rfkill[proto] == NULL) { |
| 673 | pr_err("cannot create rfkill entry for gpio %ld", |
| 674 | gpios[proto]); |
| 675 | continue; |
| 676 | } |
| 677 | /* block upon creation */ |
| 678 | rfkill_init_sw_state(kim_gdata->rfkill[proto], 1); |
| 679 | status = rfkill_register(kim_gdata->rfkill[proto]); |
| 680 | if (unlikely(status)) { |
| 681 | pr_err("rfkill registration failed for gpio %ld", |
| 682 | gpios[proto]); |
| 683 | rfkill_unregister(kim_gdata->rfkill[proto]); |
| 684 | continue; |
| 685 | } |
| 686 | pr_info("rfkill entry created for %ld", gpios[proto]); |
| 687 | } |
| 688 | #endif |
| 689 | return ST_SUCCESS; |
| 690 | } |
| 691 | |
| 692 | static int kim_remove(struct platform_device *pdev) |
| 693 | { |
| 694 | /* free the GPIOs requested |
| 695 | */ |
| 696 | long *gpios = pdev->dev.platform_data; |
| 697 | long proto; |
| 698 | |
| 699 | for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) { |
| 700 | /* Claim the Bluetooth/FM/GPIO |
| 701 | * nShutdown gpio from the system |
| 702 | */ |
| 703 | gpio_free(gpios[proto]); |
| 704 | #ifdef LEGACY_RFKILL_SUPPORT |
| 705 | rfkill_unregister(kim_gdata->rfkill[proto]); |
| 706 | rfkill_destroy(kim_gdata->rfkill[proto]); |
| 707 | kim_gdata->rfkill[proto] = NULL; |
| 708 | #endif |
| 709 | } |
| 710 | pr_info("kim: GPIO Freed"); |
| 711 | #ifndef LEGACY_RFKILL_SUPPORT |
| 712 | /* delete the sysfs entries */ |
| 713 | sysfs_remove_group(kim_gdata->kim_kobj, &uim_attr_grp); |
| 714 | kobject_put(kim_gdata->kim_kobj); |
| 715 | #endif |
| 716 | kim_gdata->kim_pdev = NULL; |
| 717 | st_core_exit(kim_gdata->core_data); |
| 718 | return ST_SUCCESS; |
| 719 | } |
| 720 | |
| 721 | /**********************************************************************/ |
| 722 | /* entry point for ST KIM module, called in from ST Core */ |
| 723 | |
| 724 | static int __init st_kim_init(void) |
| 725 | { |
| 726 | long ret = ST_SUCCESS; |
| 727 | kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC); |
| 728 | if (!kim_gdata) { |
| 729 | pr_err("no mem to allocate"); |
| 730 | return -ENOMEM; |
| 731 | } |
| 732 | |
| 733 | ret = platform_driver_register(&kim_platform_driver); |
| 734 | if (ret != 0) { |
| 735 | pr_err("platform drv registration failed"); |
| 736 | return ST_ERR_FAILURE; |
| 737 | } |
| 738 | return ST_SUCCESS; |
| 739 | } |
| 740 | |
| 741 | static void __exit st_kim_deinit(void) |
| 742 | { |
| 743 | /* the following returns void */ |
| 744 | platform_driver_unregister(&kim_platform_driver); |
| 745 | kfree(kim_gdata); |
| 746 | kim_gdata = NULL; |
| 747 | } |
| 748 | |
| 749 | |
| 750 | module_init(st_kim_init); |
| 751 | module_exit(st_kim_deinit); |
| 752 | MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>"); |
| 753 | MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips "); |
| 754 | MODULE_LICENSE("GPL"); |