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379 lines
7.7 KiB
379 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Generic Bluetooth SDIO driver |
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* |
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd. |
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* Copyright (C) 2007 Marcel Holtmann <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/errno.h> |
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#include <linux/skbuff.h> |
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#include <linux/mmc/host.h> |
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#include <linux/mmc/sdio_ids.h> |
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#include <linux/mmc/sdio_func.h> |
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#define VERSION "0.1" |
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static const struct sdio_device_id btsdio_table[] = { |
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/* Generic Bluetooth Type-A SDIO device */ |
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{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, |
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/* Generic Bluetooth Type-B SDIO device */ |
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{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, |
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/* Generic Bluetooth AMP controller */ |
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{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, |
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{ } /* Terminating entry */ |
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}; |
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MODULE_DEVICE_TABLE(sdio, btsdio_table); |
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struct btsdio_data { |
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struct hci_dev *hdev; |
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struct sdio_func *func; |
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struct work_struct work; |
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struct sk_buff_head txq; |
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}; |
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#define REG_RDAT 0x00 /* Receiver Data */ |
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#define REG_TDAT 0x00 /* Transmitter Data */ |
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#define REG_PC_RRT 0x10 /* Read Packet Control */ |
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#define REG_PC_WRT 0x11 /* Write Packet Control */ |
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#define REG_RTC_STAT 0x12 /* Retry Control Status */ |
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#define REG_RTC_SET 0x12 /* Retry Control Set */ |
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#define REG_INTRD 0x13 /* Interrupt Indication */ |
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#define REG_CL_INTRD 0x13 /* Interrupt Clear */ |
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#define REG_EN_INTRD 0x14 /* Interrupt Enable */ |
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#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ |
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#define REG_MD_SET 0x20 /* Bluetooth Mode Set */ |
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static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) |
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{ |
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int err; |
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BT_DBG("%s", data->hdev->name); |
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/* Prepend Type-A header */ |
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skb_push(skb, 4); |
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skb->data[0] = (skb->len & 0x0000ff); |
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skb->data[1] = (skb->len & 0x00ff00) >> 8; |
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skb->data[2] = (skb->len & 0xff0000) >> 16; |
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skb->data[3] = hci_skb_pkt_type(skb); |
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err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); |
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if (err < 0) { |
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skb_pull(skb, 4); |
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sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); |
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return err; |
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} |
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data->hdev->stat.byte_tx += skb->len; |
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kfree_skb(skb); |
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return 0; |
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} |
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static void btsdio_work(struct work_struct *work) |
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{ |
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struct btsdio_data *data = container_of(work, struct btsdio_data, work); |
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struct sk_buff *skb; |
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int err; |
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BT_DBG("%s", data->hdev->name); |
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sdio_claim_host(data->func); |
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while ((skb = skb_dequeue(&data->txq))) { |
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err = btsdio_tx_packet(data, skb); |
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if (err < 0) { |
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data->hdev->stat.err_tx++; |
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skb_queue_head(&data->txq, skb); |
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break; |
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} |
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} |
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sdio_release_host(data->func); |
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} |
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static int btsdio_rx_packet(struct btsdio_data *data) |
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{ |
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u8 hdr[4] __attribute__ ((aligned(4))); |
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struct sk_buff *skb; |
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int err, len; |
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BT_DBG("%s", data->hdev->name); |
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err = sdio_readsb(data->func, hdr, REG_RDAT, 4); |
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if (err < 0) |
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return err; |
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len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); |
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if (len < 4 || len > 65543) |
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return -EILSEQ; |
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skb = bt_skb_alloc(len - 4, GFP_KERNEL); |
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if (!skb) { |
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/* Out of memory. Prepare a read retry and just |
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* return with the expectation that the next time |
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* we're called we'll have more memory. |
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*/ |
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return -ENOMEM; |
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} |
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skb_put(skb, len - 4); |
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err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); |
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if (err < 0) { |
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kfree_skb(skb); |
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return err; |
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} |
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data->hdev->stat.byte_rx += len; |
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switch (hdr[3]) { |
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case HCI_EVENT_PKT: |
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case HCI_ACLDATA_PKT: |
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case HCI_SCODATA_PKT: |
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case HCI_ISODATA_PKT: |
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hci_skb_pkt_type(skb) = hdr[3]; |
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err = hci_recv_frame(data->hdev, skb); |
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if (err < 0) |
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return err; |
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break; |
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default: |
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kfree_skb(skb); |
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return -EINVAL; |
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} |
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sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); |
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return 0; |
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} |
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static void btsdio_interrupt(struct sdio_func *func) |
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{ |
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struct btsdio_data *data = sdio_get_drvdata(func); |
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int intrd; |
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BT_DBG("%s", data->hdev->name); |
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intrd = sdio_readb(func, REG_INTRD, NULL); |
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if (intrd & 0x01) { |
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sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); |
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if (btsdio_rx_packet(data) < 0) { |
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data->hdev->stat.err_rx++; |
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sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); |
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} |
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} |
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} |
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static int btsdio_open(struct hci_dev *hdev) |
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{ |
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struct btsdio_data *data = hci_get_drvdata(hdev); |
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int err; |
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BT_DBG("%s", hdev->name); |
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sdio_claim_host(data->func); |
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err = sdio_enable_func(data->func); |
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if (err < 0) |
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goto release; |
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err = sdio_claim_irq(data->func, btsdio_interrupt); |
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if (err < 0) { |
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sdio_disable_func(data->func); |
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goto release; |
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} |
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if (data->func->class == SDIO_CLASS_BT_B) |
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sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
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sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); |
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release: |
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sdio_release_host(data->func); |
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return err; |
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} |
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static int btsdio_close(struct hci_dev *hdev) |
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{ |
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struct btsdio_data *data = hci_get_drvdata(hdev); |
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BT_DBG("%s", hdev->name); |
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sdio_claim_host(data->func); |
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sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); |
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sdio_release_irq(data->func); |
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sdio_disable_func(data->func); |
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sdio_release_host(data->func); |
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return 0; |
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} |
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static int btsdio_flush(struct hci_dev *hdev) |
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{ |
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struct btsdio_data *data = hci_get_drvdata(hdev); |
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BT_DBG("%s", hdev->name); |
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skb_queue_purge(&data->txq); |
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return 0; |
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} |
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static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
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{ |
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struct btsdio_data *data = hci_get_drvdata(hdev); |
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BT_DBG("%s", hdev->name); |
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switch (hci_skb_pkt_type(skb)) { |
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case HCI_COMMAND_PKT: |
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hdev->stat.cmd_tx++; |
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break; |
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case HCI_ACLDATA_PKT: |
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hdev->stat.acl_tx++; |
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break; |
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case HCI_SCODATA_PKT: |
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hdev->stat.sco_tx++; |
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break; |
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default: |
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return -EILSEQ; |
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} |
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skb_queue_tail(&data->txq, skb); |
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schedule_work(&data->work); |
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return 0; |
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} |
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static int btsdio_probe(struct sdio_func *func, |
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const struct sdio_device_id *id) |
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{ |
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struct btsdio_data *data; |
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struct hci_dev *hdev; |
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struct sdio_func_tuple *tuple = func->tuples; |
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int err; |
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BT_DBG("func %p id %p class 0x%04x", func, id, func->class); |
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while (tuple) { |
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BT_DBG("code 0x%x size %d", tuple->code, tuple->size); |
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tuple = tuple->next; |
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} |
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/* Broadcom devices soldered onto the PCB (non-removable) use an |
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* UART connection for Bluetooth, ignore the BT SDIO interface. |
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*/ |
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if (func->vendor == SDIO_VENDOR_ID_BROADCOM && |
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!mmc_card_is_removable(func->card->host)) { |
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switch (func->device) { |
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case SDIO_DEVICE_ID_BROADCOM_43341: |
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case SDIO_DEVICE_ID_BROADCOM_43430: |
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case SDIO_DEVICE_ID_BROADCOM_4356: |
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return -ENODEV; |
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} |
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} |
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data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->func = func; |
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INIT_WORK(&data->work, btsdio_work); |
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skb_queue_head_init(&data->txq); |
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hdev = hci_alloc_dev(); |
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if (!hdev) |
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return -ENOMEM; |
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hdev->bus = HCI_SDIO; |
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hci_set_drvdata(hdev, data); |
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if (id->class == SDIO_CLASS_BT_AMP) |
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hdev->dev_type = HCI_AMP; |
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else |
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hdev->dev_type = HCI_PRIMARY; |
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data->hdev = hdev; |
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SET_HCIDEV_DEV(hdev, &func->dev); |
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hdev->open = btsdio_open; |
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hdev->close = btsdio_close; |
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hdev->flush = btsdio_flush; |
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hdev->send = btsdio_send_frame; |
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if (func->vendor == 0x0104 && func->device == 0x00c5) |
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set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); |
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err = hci_register_dev(hdev); |
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if (err < 0) { |
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hci_free_dev(hdev); |
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return err; |
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} |
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sdio_set_drvdata(func, data); |
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return 0; |
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} |
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static void btsdio_remove(struct sdio_func *func) |
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{ |
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struct btsdio_data *data = sdio_get_drvdata(func); |
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struct hci_dev *hdev; |
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BT_DBG("func %p", func); |
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if (!data) |
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return; |
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hdev = data->hdev; |
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sdio_set_drvdata(func, NULL); |
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hci_unregister_dev(hdev); |
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hci_free_dev(hdev); |
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} |
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static struct sdio_driver btsdio_driver = { |
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.name = "btsdio", |
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.probe = btsdio_probe, |
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.remove = btsdio_remove, |
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.id_table = btsdio_table, |
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}; |
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module_sdio_driver(btsdio_driver); |
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MODULE_AUTHOR("Marcel Holtmann <[email protected]>"); |
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MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); |
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MODULE_VERSION(VERSION); |
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MODULE_LICENSE("GPL");
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