--- /dev/null
+/*
+ * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/slab.h>
+#include <linux/usb/cdc.h>
+
+#include "gdm_mux.h"
+
+static struct workqueue_struct *mux_rx_wq;
+
+static u16 packet_type[TTY_MAX_COUNT] = {0xF011, 0xF010};
+
+#define USB_DEVICE_CDC_DATA(vid, pid) \
+ .match_flags = \
+ USB_DEVICE_ID_MATCH_DEVICE |\
+ USB_DEVICE_ID_MATCH_INT_CLASS |\
+ USB_DEVICE_ID_MATCH_INT_SUBCLASS,\
+ .idVendor = vid,\
+ .idProduct = pid,\
+ .bInterfaceClass = USB_CLASS_COMM,\
+ .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE_CDC_DATA(0x1076, 0x8000) }, /* GCT GDM7240 */
+ { USB_DEVICE_CDC_DATA(0x1076, 0x8f00) }, /* GCT GDM7243 */
+ { USB_DEVICE_CDC_DATA(0x1076, 0x9000) }, /* GCT GDM7243 */
+ { USB_DEVICE_CDC_DATA(0x1d74, 0x2300) }, /* LGIT Phoenix */
+ {}
+};
+
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static int packet_type_to_index(u16 packetType)
+{
+ int i;
+
+ for (i = 0; i < TTY_MAX_COUNT; i++) {
+ if (packet_type[i] == packetType)
+ return i;
+ }
+
+ return -1;
+}
+
+static struct mux_tx *alloc_mux_tx(int len)
+{
+ struct mux_tx *t = NULL;
+
+ t = kzalloc(sizeof(struct mux_tx), GFP_ATOMIC);
+ if (!t)
+ return NULL;
+
+ t->urb = usb_alloc_urb(0, GFP_ATOMIC);
+ t->buf = kmalloc(MUX_TX_MAX_SIZE, GFP_ATOMIC);
+ if (!t->urb || !t->buf) {
+ usb_free_urb(t->urb);
+ kfree(t->buf);
+ kfree(t);
+ return NULL;
+ }
+
+ return t;
+}
+
+static void free_mux_tx(struct mux_tx *t)
+{
+ if (t) {
+ usb_free_urb(t->urb);
+ kfree(t->buf);
+ kfree(t);
+ }
+}
+
+static struct mux_rx *alloc_mux_rx(void)
+{
+ struct mux_rx *r = NULL;
+
+ r = kzalloc(sizeof(struct mux_rx), GFP_KERNEL);
+ if (!r)
+ return NULL;
+
+ r->urb = usb_alloc_urb(0, GFP_KERNEL);
+ r->buf = kmalloc(MUX_RX_MAX_SIZE, GFP_KERNEL);
+ if (!r->urb || !r->buf) {
+ usb_free_urb(r->urb);
+ kfree(r->buf);
+ kfree(r);
+ return NULL;
+ }
+
+ return r;
+}
+
+static void free_mux_rx(struct mux_rx *r)
+{
+ if (r) {
+ usb_free_urb(r->urb);
+ kfree(r->buf);
+ kfree(r);
+ }
+}
+
+static struct mux_rx *get_rx_struct(struct rx_cxt *rx)
+{
+ struct mux_rx *r;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rx->free_list_lock, flags);
+
+ if (list_empty(&rx->rx_free_list)) {
+ spin_unlock_irqrestore(&rx->free_list_lock, flags);
+ return NULL;
+ }
+
+ r = list_entry(rx->rx_free_list.prev, struct mux_rx, free_list);
+ list_del(&r->free_list);
+
+ spin_unlock_irqrestore(&rx->free_list_lock, flags);
+
+ return r;
+}
+
+static void put_rx_struct(struct rx_cxt *rx, struct mux_rx *r)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&rx->free_list_lock, flags);
+ list_add_tail(&r->free_list, &rx->rx_free_list);
+ spin_unlock_irqrestore(&rx->free_list_lock, flags);
+}
+
+
+static int up_to_host(struct mux_rx *r)
+{
+ struct mux_dev *mux_dev = (struct mux_dev *)r->mux_dev;
+ struct mux_pkt_header *mux_header;
+ unsigned int start_flag;
+ unsigned int payload_size;
+ unsigned short packet_type;
+ int total_len;
+ u32 packet_size_sum = r->offset;
+ int index;
+ int ret = TO_HOST_INVALID_PACKET;
+ int len = r->len;
+
+ while (1) {
+ mux_header = (struct mux_pkt_header *)(r->buf +
+ packet_size_sum);
+ start_flag = __le32_to_cpu(mux_header->start_flag);
+ payload_size = __le32_to_cpu(mux_header->payload_size);
+ packet_type = __le16_to_cpu(mux_header->packet_type);
+
+ if (start_flag != START_FLAG) {
+ pr_err("invalid START_FLAG %x\n", start_flag);
+ break;
+ }
+
+ total_len = ALIGN(MUX_HEADER_SIZE + payload_size, 4);
+
+ if (len - packet_size_sum <
+ total_len) {
+ pr_err("invalid payload : %d %d %04x\n",
+ payload_size, len, packet_type);
+ break;
+ }
+
+ index = packet_type_to_index(packet_type);
+ if (index < 0) {
+ pr_err("invalid index %d\n", index);
+ break;
+ }
+
+ ret = r->callback(mux_header->data,
+ payload_size,
+ index,
+ mux_dev->tty_dev,
+ RECV_PACKET_PROCESS_CONTINUE
+ );
+ if (ret == TO_HOST_BUFFER_REQUEST_FAIL) {
+ r->offset += packet_size_sum;
+ break;
+ }
+
+ packet_size_sum += total_len;
+ if (len - packet_size_sum <= MUX_HEADER_SIZE + 2) {
+ ret = r->callback(NULL,
+ 0,
+ index,
+ mux_dev->tty_dev,
+ RECV_PACKET_PROCESS_COMPLETE
+ );
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void do_rx(struct work_struct *work)
+{
+ struct mux_dev *mux_dev =
+ container_of(work, struct mux_dev, work_rx.work);
+ struct mux_rx *r;
+ struct rx_cxt *rx = (struct rx_cxt *)&mux_dev->rx;
+ unsigned long flags;
+ int ret = 0;
+
+ while (1) {
+ spin_lock_irqsave(&rx->to_host_lock, flags);
+ if (list_empty(&rx->to_host_list)) {
+ spin_unlock_irqrestore(&rx->to_host_lock, flags);
+ break;
+ }
+ r = list_entry(rx->to_host_list.next, struct mux_rx,
+ to_host_list);
+ list_del(&r->to_host_list);
+ spin_unlock_irqrestore(&rx->to_host_lock, flags);
+
+ ret = up_to_host(r);
+ if (ret == TO_HOST_BUFFER_REQUEST_FAIL)
+ pr_err("failed to send mux data to host\n");
+ else
+ put_rx_struct(rx, r);
+ }
+}
+
+static void remove_rx_submit_list(struct mux_rx *r, struct rx_cxt *rx)
+{
+ unsigned long flags;
+ struct mux_rx *r_remove, *r_remove_next;
+
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ list_for_each_entry_safe(r_remove, r_remove_next, &rx->rx_submit_list,
+ rx_submit_list) {
+ if (r == r_remove)
+ list_del(&r->rx_submit_list);
+ }
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+}
+
+static void gdm_mux_rcv_complete(struct urb *urb)
+{
+ struct mux_rx *r = urb->context;
+ struct mux_dev *mux_dev = (struct mux_dev *)r->mux_dev;
+ struct rx_cxt *rx = &mux_dev->rx;
+ unsigned long flags;
+
+ remove_rx_submit_list(r, rx);
+
+ if (urb->status) {
+ if (mux_dev->usb_state == PM_NORMAL)
+ dev_err(&urb->dev->dev, "%s: urb status error %d\n",
+ __func__, urb->status);
+ put_rx_struct(rx, r);
+ } else {
+ r->len = r->urb->actual_length;
+ spin_lock_irqsave(&rx->to_host_lock, flags);
+ list_add_tail(&r->to_host_list, &rx->to_host_list);
+ queue_work(mux_rx_wq, &mux_dev->work_rx.work);
+ spin_unlock_irqrestore(&rx->to_host_lock, flags);
+ }
+}
+
+static int gdm_mux_recv(void *priv_dev, int (*cb)(void *data, int len,
+ int tty_index, struct tty_dev *tty_dev, int complete))
+{
+ struct mux_dev *mux_dev = priv_dev;
+ struct usb_device *usbdev = mux_dev->usbdev;
+ struct mux_rx *r;
+ struct rx_cxt *rx = &mux_dev->rx;
+ unsigned long flags;
+ int ret;
+
+ if (!usbdev) {
+ pr_err("device is disconnected\n");
+ return -ENODEV;
+ }
+
+ r = get_rx_struct(rx);
+ if (!r) {
+ pr_err("get_rx_struct fail\n");
+ return -ENOMEM;
+ }
+
+ r->offset = 0;
+ r->mux_dev = (void *)mux_dev;
+ r->callback = cb;
+ mux_dev->rx_cb = cb;
+
+ usb_fill_bulk_urb(r->urb,
+ usbdev,
+ usb_rcvbulkpipe(usbdev, 0x86),
+ r->buf,
+ MUX_RX_MAX_SIZE,
+ gdm_mux_rcv_complete,
+ r);
+
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ list_add_tail(&r->rx_submit_list, &rx->rx_submit_list);
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+
+ ret = usb_submit_urb(r->urb, GFP_KERNEL);
+
+ if (ret) {
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ list_del(&r->rx_submit_list);
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+
+ put_rx_struct(rx, r);
+
+ pr_err("usb_submit_urb ret=%d\n", ret);
+ }
+
+ usb_mark_last_busy(usbdev);
+
+ return ret;
+}
+
+static void gdm_mux_send_complete(struct urb *urb)
+{
+ struct mux_tx *t = urb->context;
+
+ if (urb->status == -ECONNRESET) {
+ dev_info(&urb->dev->dev, "CONNRESET\n");
+ free_mux_tx(t);
+ return;
+ }
+
+ if (t->callback)
+ t->callback(t->cb_data);
+
+ free_mux_tx(t);
+}
+
+static int gdm_mux_send(void *priv_dev, void *data, int len, int tty_index,
+ void (*cb)(void *data), void *cb_data)
+{
+ struct mux_dev *mux_dev = priv_dev;
+ struct usb_device *usbdev = mux_dev->usbdev;
+ struct mux_pkt_header *mux_header;
+ struct mux_tx *t = NULL;
+ static u32 seq_num = 1;
+ int total_len;
+ int ret;
+ unsigned long flags;
+
+ if (mux_dev->usb_state == PM_SUSPEND) {
+ ret = usb_autopm_get_interface(mux_dev->intf);
+ if (!ret)
+ usb_autopm_put_interface(mux_dev->intf);
+ }
+
+ spin_lock_irqsave(&mux_dev->write_lock, flags);
+
+ total_len = ALIGN(MUX_HEADER_SIZE + len, 4);
+
+ t = alloc_mux_tx(total_len);
+ if (!t) {
+ pr_err("alloc_mux_tx fail\n");
+ spin_unlock_irqrestore(&mux_dev->write_lock, flags);
+ return -ENOMEM;
+ }
+
+ mux_header = (struct mux_pkt_header *)t->buf;
+ mux_header->start_flag = __cpu_to_le32(START_FLAG);
+ mux_header->seq_num = __cpu_to_le32(seq_num++);
+ mux_header->payload_size = __cpu_to_le32((u32)len);
+ mux_header->packet_type = __cpu_to_le16(packet_type[tty_index]);
+
+ memcpy(t->buf+MUX_HEADER_SIZE, data, len);
+ memset(t->buf+MUX_HEADER_SIZE+len, 0, total_len - MUX_HEADER_SIZE -
+ len);
+
+ t->len = total_len;
+ t->callback = cb;
+ t->cb_data = cb_data;
+
+ usb_fill_bulk_urb(t->urb,
+ usbdev,
+ usb_sndbulkpipe(usbdev, 5),
+ t->buf,
+ total_len,
+ gdm_mux_send_complete,
+ t);
+
+ ret = usb_submit_urb(t->urb, GFP_ATOMIC);
+
+ spin_unlock_irqrestore(&mux_dev->write_lock, flags);
+
+ if (ret)
+ pr_err("usb_submit_urb Error: %d\n", ret);
+
+ usb_mark_last_busy(usbdev);
+
+ return ret;
+}
+
+static int gdm_mux_send_control(void *priv_dev, int request, int value,
+ void *buf, int len)
+{
+ struct mux_dev *mux_dev = priv_dev;
+ struct usb_device *usbdev = mux_dev->usbdev;
+ int ret;
+
+ ret = usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ request,
+ USB_RT_ACM,
+ value,
+ 2,
+ buf,
+ len,
+ 5000
+ );
+
+ if (ret < 0)
+ pr_err("usb_control_msg error: %d\n", ret);
+
+ return ret < 0 ? ret : 0;
+}
+
+static void release_usb(struct mux_dev *mux_dev)
+{
+ struct rx_cxt *rx = &mux_dev->rx;
+ struct mux_rx *r, *r_next;
+ unsigned long flags;
+
+ cancel_delayed_work(&mux_dev->work_rx);
+
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
+ rx_submit_list) {
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+ usb_kill_urb(r->urb);
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ }
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+
+ spin_lock_irqsave(&rx->free_list_lock, flags);
+ list_for_each_entry_safe(r, r_next, &rx->rx_free_list, free_list) {
+ list_del(&r->free_list);
+ free_mux_rx(r);
+ }
+ spin_unlock_irqrestore(&rx->free_list_lock, flags);
+
+ spin_lock_irqsave(&rx->to_host_lock, flags);
+ list_for_each_entry_safe(r, r_next, &rx->to_host_list, to_host_list) {
+ if (r->mux_dev == (void *)mux_dev) {
+ list_del(&r->to_host_list);
+ free_mux_rx(r);
+ }
+ }
+ spin_unlock_irqrestore(&rx->to_host_lock, flags);
+}
+
+
+static int init_usb(struct mux_dev *mux_dev)
+{
+ struct mux_rx *r;
+ struct rx_cxt *rx = &mux_dev->rx;
+ int ret = 0;
+ int i;
+
+ spin_lock_init(&mux_dev->write_lock);
+ INIT_LIST_HEAD(&rx->to_host_list);
+ INIT_LIST_HEAD(&rx->rx_submit_list);
+ INIT_LIST_HEAD(&rx->rx_free_list);
+ spin_lock_init(&rx->to_host_lock);
+ spin_lock_init(&rx->submit_list_lock);
+ spin_lock_init(&rx->free_list_lock);
+
+ for (i = 0; i < MAX_ISSUE_NUM * 2; i++) {
+ r = alloc_mux_rx();
+ if (r == NULL) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ list_add(&r->free_list, &rx->rx_free_list);
+ }
+
+ INIT_DELAYED_WORK(&mux_dev->work_rx, do_rx);
+
+ return ret;
+}
+
+static int gdm_mux_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct mux_dev *mux_dev;
+ struct tty_dev *tty_dev;
+ u16 idVendor, idProduct;
+ int bInterfaceNumber;
+ int ret;
+ int i;
+ struct usb_device *usbdev = interface_to_usbdev(intf);
+
+ bInterfaceNumber = intf->cur_altsetting->desc.bInterfaceNumber;
+
+ idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
+ idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
+
+ pr_info("mux vid = 0x%04x pid = 0x%04x\n", idVendor, idProduct);
+
+ if (bInterfaceNumber != 2)
+ return -ENODEV;
+
+ mux_dev = kzalloc(sizeof(struct mux_dev), GFP_KERNEL);
+ if (!mux_dev)
+ return -ENOMEM;
+
+ tty_dev = kzalloc(sizeof(struct tty_dev), GFP_KERNEL);
+ if (!tty_dev) {
+ ret = -ENOMEM;
+ goto err_free_mux;
+ }
+
+ mux_dev->usbdev = usbdev;
+ mux_dev->control_intf = intf;
+
+ ret = init_usb(mux_dev);
+ if (ret)
+ goto err_free_usb;
+
+ tty_dev->priv_dev = (void *)mux_dev;
+ tty_dev->send_func = gdm_mux_send;
+ tty_dev->recv_func = gdm_mux_recv;
+ tty_dev->send_control = gdm_mux_send_control;
+
+ ret = register_lte_tty_device(tty_dev, &intf->dev);
+ if (ret)
+ goto err_unregister_tty;
+
+ for (i = 0; i < TTY_MAX_COUNT; i++)
+ mux_dev->tty_dev = tty_dev;
+
+ mux_dev->intf = intf;
+ mux_dev->usb_state = PM_NORMAL;
+
+ usb_get_dev(usbdev);
+ usb_set_intfdata(intf, tty_dev);
+
+ return 0;
+
+err_unregister_tty:
+ unregister_lte_tty_device(tty_dev);
+err_free_usb:
+ release_usb(mux_dev);
+ kfree(tty_dev);
+err_free_mux:
+ kfree(mux_dev);
+
+ return ret;
+}
+
+static void gdm_mux_disconnect(struct usb_interface *intf)
+{
+ struct tty_dev *tty_dev;
+ struct mux_dev *mux_dev;
+ struct usb_device *usbdev = interface_to_usbdev(intf);
+
+ tty_dev = usb_get_intfdata(intf);
+
+ mux_dev = tty_dev->priv_dev;
+
+ release_usb(mux_dev);
+ unregister_lte_tty_device(tty_dev);
+
+ kfree(mux_dev);
+ kfree(tty_dev);
+
+ usb_put_dev(usbdev);
+}
+
+static int gdm_mux_suspend(struct usb_interface *intf, pm_message_t pm_msg)
+{
+ struct tty_dev *tty_dev;
+ struct mux_dev *mux_dev;
+ struct rx_cxt *rx;
+ struct mux_rx *r, *r_next;
+ unsigned long flags;
+
+ tty_dev = usb_get_intfdata(intf);
+ mux_dev = tty_dev->priv_dev;
+ rx = &mux_dev->rx;
+
+ if (mux_dev->usb_state != PM_NORMAL) {
+ dev_err(intf->usb_dev, "usb suspend - invalid state\n");
+ return -1;
+ }
+
+ mux_dev->usb_state = PM_SUSPEND;
+
+
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
+ rx_submit_list) {
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+ usb_kill_urb(r->urb);
+ spin_lock_irqsave(&rx->submit_list_lock, flags);
+ }
+ spin_unlock_irqrestore(&rx->submit_list_lock, flags);
+
+ return 0;
+}
+
+static int gdm_mux_resume(struct usb_interface *intf)
+{
+ struct tty_dev *tty_dev;
+ struct mux_dev *mux_dev;
+ u8 i;
+
+ tty_dev = usb_get_intfdata(intf);
+ mux_dev = tty_dev->priv_dev;
+
+ if (mux_dev->usb_state != PM_SUSPEND) {
+ dev_err(intf->usb_dev, "usb resume - invalid state\n");
+ return -1;
+ }
+
+ mux_dev->usb_state = PM_NORMAL;
+
+ for (i = 0; i < MAX_ISSUE_NUM; i++)
+ gdm_mux_recv(mux_dev, mux_dev->rx_cb);
+
+ return 0;
+}
+
+static struct usb_driver gdm_mux_driver = {
+ .name = "gdm_mux",
+ .probe = gdm_mux_probe,
+ .disconnect = gdm_mux_disconnect,
+ .id_table = id_table,
+ .supports_autosuspend = 1,
+ .suspend = gdm_mux_suspend,
+ .resume = gdm_mux_resume,
+ .reset_resume = gdm_mux_resume,
+};
+
+static int __init gdm_usb_mux_init(void)
+{
+
+ mux_rx_wq = create_workqueue("mux_rx_wq");
+ if (mux_rx_wq == NULL) {
+ pr_err("work queue create fail\n");
+ return -1;
+ }
+
+ register_lte_tty_driver();
+
+ return usb_register(&gdm_mux_driver);
+}
+
+static void __exit gdm_usb_mux_exit(void)
+{
+ unregister_lte_tty_driver();
+
+ if (mux_rx_wq) {
+ flush_workqueue(mux_rx_wq);
+ destroy_workqueue(mux_rx_wq);
+ }
+
+ usb_deregister(&gdm_mux_driver);
+}
+
+module_init(gdm_usb_mux_init);
+module_exit(gdm_usb_mux_exit);
+
+MODULE_DESCRIPTION("GCT LTE TTY Device Driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff