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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *4 * Generic Bluetooth SDIO driver5 *6 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.7 * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org>8 */9 10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/init.h>13#include <linux/slab.h>14#include <linux/types.h>15#include <linux/sched.h>16#include <linux/errno.h>17#include <linux/skbuff.h>18 19#include <linux/mmc/host.h>20#include <linux/mmc/sdio_ids.h>21#include <linux/mmc/sdio_func.h>22 23#include <net/bluetooth/bluetooth.h>24#include <net/bluetooth/hci_core.h>25 26#define VERSION "0.1"27 28static const struct sdio_device_id btsdio_table[] = {29 /* Generic Bluetooth Type-A SDIO device */30 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },31 32 /* Generic Bluetooth Type-B SDIO device */33 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },34 35 { } /* Terminating entry */36};37 38MODULE_DEVICE_TABLE(sdio, btsdio_table);39 40struct btsdio_data {41 struct hci_dev *hdev;42 struct sdio_func *func;43 44 struct work_struct work;45 46 struct sk_buff_head txq;47};48 49#define REG_RDAT 0x00 /* Receiver Data */50#define REG_TDAT 0x00 /* Transmitter Data */51#define REG_PC_RRT 0x10 /* Read Packet Control */52#define REG_PC_WRT 0x11 /* Write Packet Control */53#define REG_RTC_STAT 0x12 /* Retry Control Status */54#define REG_RTC_SET 0x12 /* Retry Control Set */55#define REG_INTRD 0x13 /* Interrupt Indication */56#define REG_CL_INTRD 0x13 /* Interrupt Clear */57#define REG_EN_INTRD 0x14 /* Interrupt Enable */58#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */59#define REG_MD_SET 0x20 /* Bluetooth Mode Set */60 61static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)62{63 int err;64 65 BT_DBG("%s", data->hdev->name);66 67 /* Prepend Type-A header */68 skb_push(skb, 4);69 skb->data[0] = (skb->len & 0x0000ff);70 skb->data[1] = (skb->len & 0x00ff00) >> 8;71 skb->data[2] = (skb->len & 0xff0000) >> 16;72 skb->data[3] = hci_skb_pkt_type(skb);73 74 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);75 if (err < 0) {76 skb_pull(skb, 4);77 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);78 return err;79 }80 81 data->hdev->stat.byte_tx += skb->len;82 83 kfree_skb(skb);84 85 return 0;86}87 88static void btsdio_work(struct work_struct *work)89{90 struct btsdio_data *data = container_of(work, struct btsdio_data, work);91 struct sk_buff *skb;92 int err;93 94 BT_DBG("%s", data->hdev->name);95 96 sdio_claim_host(data->func);97 98 while ((skb = skb_dequeue(&data->txq))) {99 err = btsdio_tx_packet(data, skb);100 if (err < 0) {101 data->hdev->stat.err_tx++;102 skb_queue_head(&data->txq, skb);103 break;104 }105 }106 107 sdio_release_host(data->func);108}109 110static int btsdio_rx_packet(struct btsdio_data *data)111{112 u8 hdr[4] __attribute__ ((aligned(4)));113 struct sk_buff *skb;114 int err, len;115 116 BT_DBG("%s", data->hdev->name);117 118 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);119 if (err < 0)120 return err;121 122 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);123 if (len < 4 || len > 65543)124 return -EILSEQ;125 126 skb = bt_skb_alloc(len - 4, GFP_KERNEL);127 if (!skb) {128 /* Out of memory. Prepare a read retry and just129 * return with the expectation that the next time130 * we're called we'll have more memory.131 */132 return -ENOMEM;133 }134 135 skb_put(skb, len - 4);136 137 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);138 if (err < 0) {139 kfree_skb(skb);140 return err;141 }142 143 data->hdev->stat.byte_rx += len;144 145 switch (hdr[3]) {146 case HCI_EVENT_PKT:147 case HCI_ACLDATA_PKT:148 case HCI_SCODATA_PKT:149 case HCI_ISODATA_PKT:150 hci_skb_pkt_type(skb) = hdr[3];151 err = hci_recv_frame(data->hdev, skb);152 if (err < 0)153 return err;154 break;155 default:156 kfree_skb(skb);157 return -EINVAL;158 }159 160 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);161 162 return 0;163}164 165static void btsdio_interrupt(struct sdio_func *func)166{167 struct btsdio_data *data = sdio_get_drvdata(func);168 int intrd;169 170 BT_DBG("%s", data->hdev->name);171 172 intrd = sdio_readb(func, REG_INTRD, NULL);173 if (intrd & 0x01) {174 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);175 176 if (btsdio_rx_packet(data) < 0) {177 data->hdev->stat.err_rx++;178 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);179 }180 }181}182 183static int btsdio_open(struct hci_dev *hdev)184{185 struct btsdio_data *data = hci_get_drvdata(hdev);186 int err;187 188 BT_DBG("%s", hdev->name);189 190 sdio_claim_host(data->func);191 192 err = sdio_enable_func(data->func);193 if (err < 0)194 goto release;195 196 err = sdio_claim_irq(data->func, btsdio_interrupt);197 if (err < 0) {198 sdio_disable_func(data->func);199 goto release;200 }201 202 if (data->func->class == SDIO_CLASS_BT_B)203 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);204 205 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);206 207release:208 sdio_release_host(data->func);209 210 return err;211}212 213static int btsdio_close(struct hci_dev *hdev)214{215 struct btsdio_data *data = hci_get_drvdata(hdev);216 217 BT_DBG("%s", hdev->name);218 219 sdio_claim_host(data->func);220 221 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);222 223 sdio_release_irq(data->func);224 sdio_disable_func(data->func);225 226 sdio_release_host(data->func);227 228 return 0;229}230 231static int btsdio_flush(struct hci_dev *hdev)232{233 struct btsdio_data *data = hci_get_drvdata(hdev);234 235 BT_DBG("%s", hdev->name);236 237 skb_queue_purge(&data->txq);238 239 return 0;240}241 242static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)243{244 struct btsdio_data *data = hci_get_drvdata(hdev);245 246 BT_DBG("%s", hdev->name);247 248 switch (hci_skb_pkt_type(skb)) {249 case HCI_COMMAND_PKT:250 hdev->stat.cmd_tx++;251 break;252 253 case HCI_ACLDATA_PKT:254 hdev->stat.acl_tx++;255 break;256 257 case HCI_SCODATA_PKT:258 hdev->stat.sco_tx++;259 break;260 261 default:262 return -EILSEQ;263 }264 265 skb_queue_tail(&data->txq, skb);266 267 schedule_work(&data->work);268 269 return 0;270}271 272static int btsdio_probe(struct sdio_func *func,273 const struct sdio_device_id *id)274{275 struct btsdio_data *data;276 struct hci_dev *hdev;277 struct sdio_func_tuple *tuple = func->tuples;278 int err;279 280 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);281 282 while (tuple) {283 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);284 tuple = tuple->next;285 }286 287 /* Broadcom devices soldered onto the PCB (non-removable) use an288 * UART connection for Bluetooth, ignore the BT SDIO interface.289 */290 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&291 !mmc_card_is_removable(func->card->host)) {292 switch (func->device) {293 case SDIO_DEVICE_ID_BROADCOM_43341:294 case SDIO_DEVICE_ID_BROADCOM_43430:295 case SDIO_DEVICE_ID_BROADCOM_4345:296 case SDIO_DEVICE_ID_BROADCOM_43455:297 case SDIO_DEVICE_ID_BROADCOM_4356:298 case SDIO_DEVICE_ID_BROADCOM_CYPRESS_4373:299 return -ENODEV;300 }301 }302 303 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);304 if (!data)305 return -ENOMEM;306 307 data->func = func;308 309 INIT_WORK(&data->work, btsdio_work);310 311 skb_queue_head_init(&data->txq);312 313 hdev = hci_alloc_dev();314 if (!hdev)315 return -ENOMEM;316 317 hdev->bus = HCI_SDIO;318 hci_set_drvdata(hdev, data);319 320 data->hdev = hdev;321 322 SET_HCIDEV_DEV(hdev, &func->dev);323 324 hdev->open = btsdio_open;325 hdev->close = btsdio_close;326 hdev->flush = btsdio_flush;327 hdev->send = btsdio_send_frame;328 329 if (func->vendor == 0x0104 && func->device == 0x00c5)330 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);331 332 err = hci_register_dev(hdev);333 if (err < 0) {334 hci_free_dev(hdev);335 return err;336 }337 338 sdio_set_drvdata(func, data);339 340 return 0;341}342 343static void btsdio_remove(struct sdio_func *func)344{345 struct btsdio_data *data = sdio_get_drvdata(func);346 struct hci_dev *hdev;347 348 BT_DBG("func %p", func);349 350 if (!data)351 return;352 353 cancel_work_sync(&data->work);354 hdev = data->hdev;355 356 sdio_set_drvdata(func, NULL);357 358 hci_unregister_dev(hdev);359 360 hci_free_dev(hdev);361}362 363static struct sdio_driver btsdio_driver = {364 .name = "btsdio",365 .probe = btsdio_probe,366 .remove = btsdio_remove,367 .id_table = btsdio_table,368};369 370module_sdio_driver(btsdio_driver);371 372MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");373MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);374MODULE_VERSION(VERSION);375MODULE_LICENSE("GPL");376