Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[rpmsg/rpmsg.git] / drivers / bluetooth / hci_qca.c
1 /*
2  *  Bluetooth Software UART Qualcomm protocol
3  *
4  *  HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
5  *  protocol extension to H4.
6  *
7  *  Copyright (C) 2007 Texas Instruments, Inc.
8  *  Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
9  *
10  *  Acknowledgements:
11  *  This file is based on hci_ll.c, which was...
12  *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
13  *  which was in turn based on hci_h4.c, which was written
14  *  by Maxim Krasnyansky and Marcel Holtmann.
15  *
16  *  This program is free software; you can redistribute it and/or modify
17  *  it under the terms of the GNU General Public License version 2
18  *  as published by the Free Software Foundation
19  *
20  *  This program is distributed in the hope that it will be useful,
21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23  *  GNU General Public License for more details.
24  *
25  *  You should have received a copy of the GNU General Public License
26  *  along with this program; if not, write to the Free Software
27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
28  *
29  */
31 #include <linux/kernel.h>
32 #include <linux/clk.h>
33 #include <linux/debugfs.h>
34 #include <linux/delay.h>
35 #include <linux/device.h>
36 #include <linux/gpio/consumer.h>
37 #include <linux/mod_devicetable.h>
38 #include <linux/module.h>
39 #include <linux/of_device.h>
40 #include <linux/platform_device.h>
41 #include <linux/regulator/consumer.h>
42 #include <linux/serdev.h>
44 #include <net/bluetooth/bluetooth.h>
45 #include <net/bluetooth/hci_core.h>
47 #include "hci_uart.h"
48 #include "btqca.h"
50 /* HCI_IBS protocol messages */
51 #define HCI_IBS_SLEEP_IND       0xFE
52 #define HCI_IBS_WAKE_IND        0xFD
53 #define HCI_IBS_WAKE_ACK        0xFC
54 #define HCI_MAX_IBS_SIZE        10
56 /* Controller states */
57 #define STATE_IN_BAND_SLEEP_ENABLED     1
59 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
60 #define IBS_TX_IDLE_TIMEOUT_MS          2000
61 #define BAUDRATE_SETTLE_TIMEOUT_MS      300
63 /* susclk rate */
64 #define SUSCLK_RATE_32KHZ       32768
66 /* HCI_IBS transmit side sleep protocol states */
67 enum tx_ibs_states {
68         HCI_IBS_TX_ASLEEP,
69         HCI_IBS_TX_WAKING,
70         HCI_IBS_TX_AWAKE,
71 };
73 /* HCI_IBS receive side sleep protocol states */
74 enum rx_states {
75         HCI_IBS_RX_ASLEEP,
76         HCI_IBS_RX_AWAKE,
77 };
79 /* HCI_IBS transmit and receive side clock state vote */
80 enum hci_ibs_clock_state_vote {
81         HCI_IBS_VOTE_STATS_UPDATE,
82         HCI_IBS_TX_VOTE_CLOCK_ON,
83         HCI_IBS_TX_VOTE_CLOCK_OFF,
84         HCI_IBS_RX_VOTE_CLOCK_ON,
85         HCI_IBS_RX_VOTE_CLOCK_OFF,
86 };
88 struct qca_data {
89         struct hci_uart *hu;
90         struct sk_buff *rx_skb;
91         struct sk_buff_head txq;
92         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
93         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
94         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
95         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
96         bool tx_vote;           /* Clock must be on for TX */
97         bool rx_vote;           /* Clock must be on for RX */
98         struct timer_list tx_idle_timer;
99         u32 tx_idle_delay;
100         struct timer_list wake_retrans_timer;
101         u32 wake_retrans;
102         struct workqueue_struct *workqueue;
103         struct work_struct ws_awake_rx;
104         struct work_struct ws_awake_device;
105         struct work_struct ws_rx_vote_off;
106         struct work_struct ws_tx_vote_off;
107         unsigned long flags;
109         /* For debugging purpose */
110         u64 ibs_sent_wacks;
111         u64 ibs_sent_slps;
112         u64 ibs_sent_wakes;
113         u64 ibs_recv_wacks;
114         u64 ibs_recv_slps;
115         u64 ibs_recv_wakes;
116         u64 vote_last_jif;
117         u32 vote_on_ms;
118         u32 vote_off_ms;
119         u64 tx_votes_on;
120         u64 rx_votes_on;
121         u64 tx_votes_off;
122         u64 rx_votes_off;
123         u64 votes_on;
124         u64 votes_off;
125 };
127 enum qca_speed_type {
128         QCA_INIT_SPEED = 1,
129         QCA_OPER_SPEED
130 };
132 /*
133  * Voltage regulator information required for configuring the
134  * QCA Bluetooth chipset
135  */
136 struct qca_vreg {
137         const char *name;
138         unsigned int min_uV;
139         unsigned int max_uV;
140         unsigned int load_uA;
141 };
143 struct qca_vreg_data {
144         enum qca_btsoc_type soc_type;
145         struct qca_vreg *vregs;
146         size_t num_vregs;
147 };
149 /*
150  * Platform data for the QCA Bluetooth power driver.
151  */
152 struct qca_power {
153         struct device *dev;
154         const struct qca_vreg_data *vreg_data;
155         struct regulator_bulk_data *vreg_bulk;
156         bool vregs_on;
157 };
159 struct qca_serdev {
160         struct hci_uart  serdev_hu;
161         struct gpio_desc *bt_en;
162         struct clk       *susclk;
163         enum qca_btsoc_type btsoc_type;
164         struct qca_power *bt_power;
165         u32 init_speed;
166         u32 oper_speed;
167 };
169 static int qca_power_setup(struct hci_uart *hu, bool on);
170 static void qca_power_shutdown(struct hci_dev *hdev);
172 static void __serial_clock_on(struct tty_struct *tty)
174         /* TODO: Some chipset requires to enable UART clock on client
175          * side to save power consumption or manual work is required.
176          * Please put your code to control UART clock here if needed
177          */
180 static void __serial_clock_off(struct tty_struct *tty)
182         /* TODO: Some chipset requires to disable UART clock on client
183          * side to save power consumption or manual work is required.
184          * Please put your code to control UART clock off here if needed
185          */
188 /* serial_clock_vote needs to be called with the ibs lock held */
189 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
191         struct qca_data *qca = hu->priv;
192         unsigned int diff;
194         bool old_vote = (qca->tx_vote | qca->rx_vote);
195         bool new_vote;
197         switch (vote) {
198         case HCI_IBS_VOTE_STATS_UPDATE:
199                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
201                 if (old_vote)
202                         qca->vote_off_ms += diff;
203                 else
204                         qca->vote_on_ms += diff;
205                 return;
207         case HCI_IBS_TX_VOTE_CLOCK_ON:
208                 qca->tx_vote = true;
209                 qca->tx_votes_on++;
210                 new_vote = true;
211                 break;
213         case HCI_IBS_RX_VOTE_CLOCK_ON:
214                 qca->rx_vote = true;
215                 qca->rx_votes_on++;
216                 new_vote = true;
217                 break;
219         case HCI_IBS_TX_VOTE_CLOCK_OFF:
220                 qca->tx_vote = false;
221                 qca->tx_votes_off++;
222                 new_vote = qca->rx_vote | qca->tx_vote;
223                 break;
225         case HCI_IBS_RX_VOTE_CLOCK_OFF:
226                 qca->rx_vote = false;
227                 qca->rx_votes_off++;
228                 new_vote = qca->rx_vote | qca->tx_vote;
229                 break;
231         default:
232                 BT_ERR("Voting irregularity");
233                 return;
234         }
236         if (new_vote != old_vote) {
237                 if (new_vote)
238                         __serial_clock_on(hu->tty);
239                 else
240                         __serial_clock_off(hu->tty);
242                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
243                        vote ? "true" : "false");
245                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
247                 if (new_vote) {
248                         qca->votes_on++;
249                         qca->vote_off_ms += diff;
250                 } else {
251                         qca->votes_off++;
252                         qca->vote_on_ms += diff;
253                 }
254                 qca->vote_last_jif = jiffies;
255         }
258 /* Builds and sends an HCI_IBS command packet.
259  * These are very simple packets with only 1 cmd byte.
260  */
261 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
263         int err = 0;
264         struct sk_buff *skb = NULL;
265         struct qca_data *qca = hu->priv;
267         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
269         skb = bt_skb_alloc(1, GFP_ATOMIC);
270         if (!skb) {
271                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
272                 return -ENOMEM;
273         }
275         /* Assign HCI_IBS type */
276         skb_put_u8(skb, cmd);
278         skb_queue_tail(&qca->txq, skb);
280         return err;
283 static void qca_wq_awake_device(struct work_struct *work)
285         struct qca_data *qca = container_of(work, struct qca_data,
286                                             ws_awake_device);
287         struct hci_uart *hu = qca->hu;
288         unsigned long retrans_delay;
290         BT_DBG("hu %p wq awake device", hu);
292         /* Vote for serial clock */
293         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
295         spin_lock(&qca->hci_ibs_lock);
297         /* Send wake indication to device */
298         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
299                 BT_ERR("Failed to send WAKE to device");
301         qca->ibs_sent_wakes++;
303         /* Start retransmit timer */
304         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
305         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
307         spin_unlock(&qca->hci_ibs_lock);
309         /* Actually send the packets */
310         hci_uart_tx_wakeup(hu);
313 static void qca_wq_awake_rx(struct work_struct *work)
315         struct qca_data *qca = container_of(work, struct qca_data,
316                                             ws_awake_rx);
317         struct hci_uart *hu = qca->hu;
319         BT_DBG("hu %p wq awake rx", hu);
321         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
323         spin_lock(&qca->hci_ibs_lock);
324         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
326         /* Always acknowledge device wake up,
327          * sending IBS message doesn't count as TX ON.
328          */
329         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
330                 BT_ERR("Failed to acknowledge device wake up");
332         qca->ibs_sent_wacks++;
334         spin_unlock(&qca->hci_ibs_lock);
336         /* Actually send the packets */
337         hci_uart_tx_wakeup(hu);
340 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
342         struct qca_data *qca = container_of(work, struct qca_data,
343                                             ws_rx_vote_off);
344         struct hci_uart *hu = qca->hu;
346         BT_DBG("hu %p rx clock vote off", hu);
348         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
351 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
353         struct qca_data *qca = container_of(work, struct qca_data,
354                                             ws_tx_vote_off);
355         struct hci_uart *hu = qca->hu;
357         BT_DBG("hu %p tx clock vote off", hu);
359         /* Run HCI tx handling unlocked */
360         hci_uart_tx_wakeup(hu);
362         /* Now that message queued to tty driver, vote for tty clocks off.
363          * It is up to the tty driver to pend the clocks off until tx done.
364          */
365         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
368 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
370         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
371         struct hci_uart *hu = qca->hu;
372         unsigned long flags;
374         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
376         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
377                                  flags, SINGLE_DEPTH_NESTING);
379         switch (qca->tx_ibs_state) {
380         case HCI_IBS_TX_AWAKE:
381                 /* TX_IDLE, go to SLEEP */
382                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
383                         BT_ERR("Failed to send SLEEP to device");
384                         break;
385                 }
386                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
387                 qca->ibs_sent_slps++;
388                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
389                 break;
391         case HCI_IBS_TX_ASLEEP:
392         case HCI_IBS_TX_WAKING:
393                 /* Fall through */
395         default:
396                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
397                 break;
398         }
400         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
403 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
405         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
406         struct hci_uart *hu = qca->hu;
407         unsigned long flags, retrans_delay;
408         bool retransmit = false;
410         BT_DBG("hu %p wake retransmit timeout in %d state",
411                 hu, qca->tx_ibs_state);
413         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
414                                  flags, SINGLE_DEPTH_NESTING);
416         switch (qca->tx_ibs_state) {
417         case HCI_IBS_TX_WAKING:
418                 /* No WAKE_ACK, retransmit WAKE */
419                 retransmit = true;
420                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
421                         BT_ERR("Failed to acknowledge device wake up");
422                         break;
423                 }
424                 qca->ibs_sent_wakes++;
425                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
426                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
427                 break;
429         case HCI_IBS_TX_ASLEEP:
430         case HCI_IBS_TX_AWAKE:
431                 /* Fall through */
433         default:
434                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
435                 break;
436         }
438         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
440         if (retransmit)
441                 hci_uart_tx_wakeup(hu);
444 /* Initialize protocol */
445 static int qca_open(struct hci_uart *hu)
447         struct qca_serdev *qcadev;
448         struct qca_data *qca;
449         int ret;
451         BT_DBG("hu %p qca_open", hu);
453         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
454         if (!qca)
455                 return -ENOMEM;
457         skb_queue_head_init(&qca->txq);
458         skb_queue_head_init(&qca->tx_wait_q);
459         spin_lock_init(&qca->hci_ibs_lock);
460         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
461         if (!qca->workqueue) {
462                 BT_ERR("QCA Workqueue not initialized properly");
463                 kfree(qca);
464                 return -ENOMEM;
465         }
467         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
468         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
469         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
470         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
472         qca->hu = hu;
474         /* Assume we start with both sides asleep -- extra wakes OK */
475         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
476         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
478         /* clocks actually on, but we start votes off */
479         qca->tx_vote = false;
480         qca->rx_vote = false;
481         qca->flags = 0;
483         qca->ibs_sent_wacks = 0;
484         qca->ibs_sent_slps = 0;
485         qca->ibs_sent_wakes = 0;
486         qca->ibs_recv_wacks = 0;
487         qca->ibs_recv_slps = 0;
488         qca->ibs_recv_wakes = 0;
489         qca->vote_last_jif = jiffies;
490         qca->vote_on_ms = 0;
491         qca->vote_off_ms = 0;
492         qca->votes_on = 0;
493         qca->votes_off = 0;
494         qca->tx_votes_on = 0;
495         qca->tx_votes_off = 0;
496         qca->rx_votes_on = 0;
497         qca->rx_votes_off = 0;
499         hu->priv = qca;
501         if (hu->serdev) {
502                 serdev_device_open(hu->serdev);
504                 qcadev = serdev_device_get_drvdata(hu->serdev);
505                 if (qcadev->btsoc_type != QCA_WCN3990) {
506                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
507                 } else {
508                         hu->init_speed = qcadev->init_speed;
509                         hu->oper_speed = qcadev->oper_speed;
510                         ret = qca_power_setup(hu, true);
511                         if (ret) {
512                                 destroy_workqueue(qca->workqueue);
513                                 kfree_skb(qca->rx_skb);
514                                 hu->priv = NULL;
515                                 kfree(qca);
516                                 return ret;
517                         }
518                 }
519         }
521         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
522         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
524         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
525         qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
527         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
528                qca->tx_idle_delay, qca->wake_retrans);
530         return 0;
533 static void qca_debugfs_init(struct hci_dev *hdev)
535         struct hci_uart *hu = hci_get_drvdata(hdev);
536         struct qca_data *qca = hu->priv;
537         struct dentry *ibs_dir;
538         umode_t mode;
540         if (!hdev->debugfs)
541                 return;
543         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
545         /* read only */
546         mode = S_IRUGO;
547         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
548         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
549         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
550                            &qca->ibs_sent_slps);
551         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
552                            &qca->ibs_sent_wakes);
553         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
554                            &qca->ibs_sent_wacks);
555         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
556                            &qca->ibs_recv_slps);
557         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
558                            &qca->ibs_recv_wakes);
559         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
560                            &qca->ibs_recv_wacks);
561         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
562         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
563         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
564         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
565         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
566         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
567         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
568         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
569         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
570         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
572         /* read/write */
573         mode = S_IRUGO | S_IWUSR;
574         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
575         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
576                            &qca->tx_idle_delay);
579 /* Flush protocol data */
580 static int qca_flush(struct hci_uart *hu)
582         struct qca_data *qca = hu->priv;
584         BT_DBG("hu %p qca flush", hu);
586         skb_queue_purge(&qca->tx_wait_q);
587         skb_queue_purge(&qca->txq);
589         return 0;
592 /* Close protocol */
593 static int qca_close(struct hci_uart *hu)
595         struct qca_serdev *qcadev;
596         struct qca_data *qca = hu->priv;
598         BT_DBG("hu %p qca close", hu);
600         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
602         skb_queue_purge(&qca->tx_wait_q);
603         skb_queue_purge(&qca->txq);
604         del_timer(&qca->tx_idle_timer);
605         del_timer(&qca->wake_retrans_timer);
606         destroy_workqueue(qca->workqueue);
607         qca->hu = NULL;
609         if (hu->serdev) {
610                 qcadev = serdev_device_get_drvdata(hu->serdev);
611                 if (qcadev->btsoc_type == QCA_WCN3990)
612                         qca_power_shutdown(hu->hdev);
613                 else
614                         gpiod_set_value_cansleep(qcadev->bt_en, 0);
616                 serdev_device_close(hu->serdev);
617         }
619         kfree_skb(qca->rx_skb);
621         hu->priv = NULL;
623         kfree(qca);
625         return 0;
628 /* Called upon a wake-up-indication from the device.
629  */
630 static void device_want_to_wakeup(struct hci_uart *hu)
632         unsigned long flags;
633         struct qca_data *qca = hu->priv;
635         BT_DBG("hu %p want to wake up", hu);
637         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
639         qca->ibs_recv_wakes++;
641         switch (qca->rx_ibs_state) {
642         case HCI_IBS_RX_ASLEEP:
643                 /* Make sure clock is on - we may have turned clock off since
644                  * receiving the wake up indicator awake rx clock.
645                  */
646                 queue_work(qca->workqueue, &qca->ws_awake_rx);
647                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
648                 return;
650         case HCI_IBS_RX_AWAKE:
651                 /* Always acknowledge device wake up,
652                  * sending IBS message doesn't count as TX ON.
653                  */
654                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
655                         BT_ERR("Failed to acknowledge device wake up");
656                         break;
657                 }
658                 qca->ibs_sent_wacks++;
659                 break;
661         default:
662                 /* Any other state is illegal */
663                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
664                        qca->rx_ibs_state);
665                 break;
666         }
668         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
670         /* Actually send the packets */
671         hci_uart_tx_wakeup(hu);
674 /* Called upon a sleep-indication from the device.
675  */
676 static void device_want_to_sleep(struct hci_uart *hu)
678         unsigned long flags;
679         struct qca_data *qca = hu->priv;
681         BT_DBG("hu %p want to sleep", hu);
683         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
685         qca->ibs_recv_slps++;
687         switch (qca->rx_ibs_state) {
688         case HCI_IBS_RX_AWAKE:
689                 /* Update state */
690                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
691                 /* Vote off rx clock under workqueue */
692                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
693                 break;
695         case HCI_IBS_RX_ASLEEP:
696                 /* Fall through */
698         default:
699                 /* Any other state is illegal */
700                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
701                        qca->rx_ibs_state);
702                 break;
703         }
705         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
708 /* Called upon wake-up-acknowledgement from the device
709  */
710 static void device_woke_up(struct hci_uart *hu)
712         unsigned long flags, idle_delay;
713         struct qca_data *qca = hu->priv;
714         struct sk_buff *skb = NULL;
716         BT_DBG("hu %p woke up", hu);
718         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
720         qca->ibs_recv_wacks++;
722         switch (qca->tx_ibs_state) {
723         case HCI_IBS_TX_AWAKE:
724                 /* Expect one if we send 2 WAKEs */
725                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
726                        qca->tx_ibs_state);
727                 break;
729         case HCI_IBS_TX_WAKING:
730                 /* Send pending packets */
731                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
732                         skb_queue_tail(&qca->txq, skb);
734                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
735                 del_timer(&qca->wake_retrans_timer);
736                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
737                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
738                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
739                 break;
741         case HCI_IBS_TX_ASLEEP:
742                 /* Fall through */
744         default:
745                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
746                        qca->tx_ibs_state);
747                 break;
748         }
750         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
752         /* Actually send the packets */
753         hci_uart_tx_wakeup(hu);
756 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
757  * two simultaneous tasklets.
758  */
759 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
761         unsigned long flags = 0, idle_delay;
762         struct qca_data *qca = hu->priv;
764         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
765                qca->tx_ibs_state);
767         /* Prepend skb with frame type */
768         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
770         /* Don't go to sleep in middle of patch download or
771          * Out-Of-Band(GPIOs control) sleep is selected.
772          */
773         if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
774                 skb_queue_tail(&qca->txq, skb);
775                 return 0;
776         }
778         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
780         /* Act according to current state */
781         switch (qca->tx_ibs_state) {
782         case HCI_IBS_TX_AWAKE:
783                 BT_DBG("Device awake, sending normally");
784                 skb_queue_tail(&qca->txq, skb);
785                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
786                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
787                 break;
789         case HCI_IBS_TX_ASLEEP:
790                 BT_DBG("Device asleep, waking up and queueing packet");
791                 /* Save packet for later */
792                 skb_queue_tail(&qca->tx_wait_q, skb);
794                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
795                 /* Schedule a work queue to wake up device */
796                 queue_work(qca->workqueue, &qca->ws_awake_device);
797                 break;
799         case HCI_IBS_TX_WAKING:
800                 BT_DBG("Device waking up, queueing packet");
801                 /* Transient state; just keep packet for later */
802                 skb_queue_tail(&qca->tx_wait_q, skb);
803                 break;
805         default:
806                 BT_ERR("Illegal tx state: %d (losing packet)",
807                        qca->tx_ibs_state);
808                 kfree_skb(skb);
809                 break;
810         }
812         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
814         return 0;
817 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
819         struct hci_uart *hu = hci_get_drvdata(hdev);
821         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
823         device_want_to_sleep(hu);
825         kfree_skb(skb);
826         return 0;
829 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
831         struct hci_uart *hu = hci_get_drvdata(hdev);
833         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
835         device_want_to_wakeup(hu);
837         kfree_skb(skb);
838         return 0;
841 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
843         struct hci_uart *hu = hci_get_drvdata(hdev);
845         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
847         device_woke_up(hu);
849         kfree_skb(skb);
850         return 0;
853 #define QCA_IBS_SLEEP_IND_EVENT \
854         .type = HCI_IBS_SLEEP_IND, \
855         .hlen = 0, \
856         .loff = 0, \
857         .lsize = 0, \
858         .maxlen = HCI_MAX_IBS_SIZE
860 #define QCA_IBS_WAKE_IND_EVENT \
861         .type = HCI_IBS_WAKE_IND, \
862         .hlen = 0, \
863         .loff = 0, \
864         .lsize = 0, \
865         .maxlen = HCI_MAX_IBS_SIZE
867 #define QCA_IBS_WAKE_ACK_EVENT \
868         .type = HCI_IBS_WAKE_ACK, \
869         .hlen = 0, \
870         .loff = 0, \
871         .lsize = 0, \
872         .maxlen = HCI_MAX_IBS_SIZE
874 static const struct h4_recv_pkt qca_recv_pkts[] = {
875         { H4_RECV_ACL,             .recv = hci_recv_frame    },
876         { H4_RECV_SCO,             .recv = hci_recv_frame    },
877         { H4_RECV_EVENT,           .recv = hci_recv_frame    },
878         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
879         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
880         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
881 };
883 static int qca_recv(struct hci_uart *hu, const void *data, int count)
885         struct qca_data *qca = hu->priv;
887         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
888                 return -EUNATCH;
890         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
891                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
892         if (IS_ERR(qca->rx_skb)) {
893                 int err = PTR_ERR(qca->rx_skb);
894                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
895                 qca->rx_skb = NULL;
896                 return err;
897         }
899         return count;
902 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
904         struct qca_data *qca = hu->priv;
906         return skb_dequeue(&qca->txq);
909 static uint8_t qca_get_baudrate_value(int speed)
911         switch (speed) {
912         case 9600:
913                 return QCA_BAUDRATE_9600;
914         case 19200:
915                 return QCA_BAUDRATE_19200;
916         case 38400:
917                 return QCA_BAUDRATE_38400;
918         case 57600:
919                 return QCA_BAUDRATE_57600;
920         case 115200:
921                 return QCA_BAUDRATE_115200;
922         case 230400:
923                 return QCA_BAUDRATE_230400;
924         case 460800:
925                 return QCA_BAUDRATE_460800;
926         case 500000:
927                 return QCA_BAUDRATE_500000;
928         case 921600:
929                 return QCA_BAUDRATE_921600;
930         case 1000000:
931                 return QCA_BAUDRATE_1000000;
932         case 2000000:
933                 return QCA_BAUDRATE_2000000;
934         case 3000000:
935                 return QCA_BAUDRATE_3000000;
936         case 3200000:
937                 return QCA_BAUDRATE_3200000;
938         case 3500000:
939                 return QCA_BAUDRATE_3500000;
940         default:
941                 return QCA_BAUDRATE_115200;
942         }
945 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
947         struct hci_uart *hu = hci_get_drvdata(hdev);
948         struct qca_data *qca = hu->priv;
949         struct sk_buff *skb;
950         struct qca_serdev *qcadev;
951         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
953         if (baudrate > QCA_BAUDRATE_3200000)
954                 return -EINVAL;
956         cmd[4] = baudrate;
958         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
959         if (!skb) {
960                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
961                 return -ENOMEM;
962         }
964         /* Disabling hardware flow control is mandatory while
965          * sending change baudrate request to wcn3990 SoC.
966          */
967         qcadev = serdev_device_get_drvdata(hu->serdev);
968         if (qcadev->btsoc_type == QCA_WCN3990)
969                 hci_uart_set_flow_control(hu, true);
971         /* Assign commands to change baudrate and packet type. */
972         skb_put_data(skb, cmd, sizeof(cmd));
973         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
975         skb_queue_tail(&qca->txq, skb);
976         hci_uart_tx_wakeup(hu);
978         /* wait 300ms to change new baudrate on controller side
979          * controller will come back after they receive this HCI command
980          * then host can communicate with new baudrate to controller
981          */
982         set_current_state(TASK_UNINTERRUPTIBLE);
983         schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
984         set_current_state(TASK_RUNNING);
986         if (qcadev->btsoc_type == QCA_WCN3990)
987                 hci_uart_set_flow_control(hu, false);
989         return 0;
992 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
994         if (hu->serdev)
995                 serdev_device_set_baudrate(hu->serdev, speed);
996         else
997                 hci_uart_set_baudrate(hu, speed);
1000 static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
1002         struct hci_uart *hu = hci_get_drvdata(hdev);
1003         struct qca_data *qca = hu->priv;
1004         struct sk_buff *skb;
1006         /* These power pulses are single byte command which are sent
1007          * at required baudrate to wcn3990. On wcn3990, we have an external
1008          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1009          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1010          * and also we use the same power inputs to turn on and off for
1011          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1012          * we send a power on pulse at 115200 bps. This algorithm will help to
1013          * save power. Disabling hardware flow control is mandatory while
1014          * sending power pulses to SoC.
1015          */
1016         bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
1018         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1019         if (!skb)
1020                 return -ENOMEM;
1022         hci_uart_set_flow_control(hu, true);
1024         skb_put_u8(skb, cmd);
1025         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1027         skb_queue_tail(&qca->txq, skb);
1028         hci_uart_tx_wakeup(hu);
1030         /* Wait for 100 uS for SoC to settle down */
1031         usleep_range(100, 200);
1032         hci_uart_set_flow_control(hu, false);
1034         return 0;
1037 static unsigned int qca_get_speed(struct hci_uart *hu,
1038                                   enum qca_speed_type speed_type)
1040         unsigned int speed = 0;
1042         if (speed_type == QCA_INIT_SPEED) {
1043                 if (hu->init_speed)
1044                         speed = hu->init_speed;
1045                 else if (hu->proto->init_speed)
1046                         speed = hu->proto->init_speed;
1047         } else {
1048                 if (hu->oper_speed)
1049                         speed = hu->oper_speed;
1050                 else if (hu->proto->oper_speed)
1051                         speed = hu->proto->oper_speed;
1052         }
1054         return speed;
1057 static int qca_check_speeds(struct hci_uart *hu)
1059         struct qca_serdev *qcadev;
1061         qcadev = serdev_device_get_drvdata(hu->serdev);
1062         if (qcadev->btsoc_type == QCA_WCN3990) {
1063                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1064                     !qca_get_speed(hu, QCA_OPER_SPEED))
1065                         return -EINVAL;
1066         } else {
1067                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1068                     !qca_get_speed(hu, QCA_OPER_SPEED))
1069                         return -EINVAL;
1070         }
1072         return 0;
1075 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1077         unsigned int speed, qca_baudrate;
1078         int ret;
1080         if (speed_type == QCA_INIT_SPEED) {
1081                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1082                 if (speed)
1083                         host_set_baudrate(hu, speed);
1084         } else {
1085                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1086                 if (!speed)
1087                         return 0;
1089                 qca_baudrate = qca_get_baudrate_value(speed);
1090                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1091                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1092                 if (ret)
1093                         return ret;
1095                 host_set_baudrate(hu, speed);
1096         }
1098         return 0;
1101 static int qca_wcn3990_init(struct hci_uart *hu)
1103         struct hci_dev *hdev = hu->hdev;
1104         int ret;
1106         /* Forcefully enable wcn3990 to enter in to boot mode. */
1107         host_set_baudrate(hu, 2400);
1108         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1109         if (ret)
1110                 return ret;
1112         qca_set_speed(hu, QCA_INIT_SPEED);
1113         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
1114         if (ret)
1115                 return ret;
1117         /* Wait for 100 ms for SoC to boot */
1118         msleep(100);
1120         /* Now the device is in ready state to communicate with host.
1121          * To sync host with device we need to reopen port.
1122          * Without this, we will have RTS and CTS synchronization
1123          * issues.
1124          */
1125         serdev_device_close(hu->serdev);
1126         ret = serdev_device_open(hu->serdev);
1127         if (ret) {
1128                 bt_dev_err(hu->hdev, "failed to open port");
1129                 return ret;
1130         }
1132         hci_uart_set_flow_control(hu, false);
1134         return 0;
1137 static int qca_setup(struct hci_uart *hu)
1139         struct hci_dev *hdev = hu->hdev;
1140         struct qca_data *qca = hu->priv;
1141         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1142         struct qca_serdev *qcadev;
1143         int ret;
1144         int soc_ver = 0;
1146         qcadev = serdev_device_get_drvdata(hu->serdev);
1148         ret = qca_check_speeds(hu);
1149         if (ret)
1150                 return ret;
1152         /* Patch downloading has to be done without IBS mode */
1153         clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1155         if (qcadev->btsoc_type == QCA_WCN3990) {
1156                 bt_dev_info(hdev, "setting up wcn3990");
1157                 ret = qca_wcn3990_init(hu);
1158                 if (ret)
1159                         return ret;
1161                 ret = qca_read_soc_version(hdev, &soc_ver);
1162                 if (ret)
1163                         return ret;
1164         } else {
1165                 bt_dev_info(hdev, "ROME setup");
1166                 qca_set_speed(hu, QCA_INIT_SPEED);
1167         }
1169         /* Setup user speed if needed */
1170         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1171         if (speed) {
1172                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1173                 if (ret)
1174                         return ret;
1176                 qca_baudrate = qca_get_baudrate_value(speed);
1177         }
1179         if (qcadev->btsoc_type != QCA_WCN3990) {
1180                 /* Get QCA version information */
1181                 ret = qca_read_soc_version(hdev, &soc_ver);
1182                 if (ret)
1183                         return ret;
1184         }
1186         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1187         /* Setup patch / NVM configurations */
1188         ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
1189         if (!ret) {
1190                 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1191                 qca_debugfs_init(hdev);
1192         } else if (ret == -ENOENT) {
1193                 /* No patch/nvm-config found, run with original fw/config */
1194                 ret = 0;
1195         } else if (ret == -EAGAIN) {
1196                 /*
1197                  * Userspace firmware loader will return -EAGAIN in case no
1198                  * patch/nvm-config is found, so run with original fw/config.
1199                  */
1200                 ret = 0;
1201         }
1203         /* Setup bdaddr */
1204         hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1206         return ret;
1209 static struct hci_uart_proto qca_proto = {
1210         .id             = HCI_UART_QCA,
1211         .name           = "QCA",
1212         .manufacturer   = 29,
1213         .init_speed     = 115200,
1214         .oper_speed     = 3000000,
1215         .open           = qca_open,
1216         .close          = qca_close,
1217         .flush          = qca_flush,
1218         .setup          = qca_setup,
1219         .recv           = qca_recv,
1220         .enqueue        = qca_enqueue,
1221         .dequeue        = qca_dequeue,
1222 };
1224 static const struct qca_vreg_data qca_soc_data = {
1225         .soc_type = QCA_WCN3990,
1226         .vregs = (struct qca_vreg []) {
1227                 { "vddio",   1800000, 1900000,  15000  },
1228                 { "vddxo",   1800000, 1900000,  80000  },
1229                 { "vddrf",   1300000, 1350000,  300000 },
1230                 { "vddch0",  3300000, 3400000,  450000 },
1231         },
1232         .num_vregs = 4,
1233 };
1235 static void qca_power_shutdown(struct hci_dev *hdev)
1237         struct hci_uart *hu = hci_get_drvdata(hdev);
1239         host_set_baudrate(hu, 2400);
1240         qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1241         qca_power_setup(hu, false);
1244 static int qca_enable_regulator(struct qca_vreg vregs,
1245                                 struct regulator *regulator)
1247         int ret;
1249         ret = regulator_set_voltage(regulator, vregs.min_uV,
1250                                     vregs.max_uV);
1251         if (ret)
1252                 return ret;
1254         if (vregs.load_uA)
1255                 ret = regulator_set_load(regulator,
1256                                          vregs.load_uA);
1258         if (ret)
1259                 return ret;
1261         return regulator_enable(regulator);
1265 static void qca_disable_regulator(struct qca_vreg vregs,
1266                                   struct regulator *regulator)
1268         regulator_disable(regulator);
1269         regulator_set_voltage(regulator, 0, vregs.max_uV);
1270         if (vregs.load_uA)
1271                 regulator_set_load(regulator, 0);
1275 static int qca_power_setup(struct hci_uart *hu, bool on)
1277         struct qca_vreg *vregs;
1278         struct regulator_bulk_data *vreg_bulk;
1279         struct qca_serdev *qcadev;
1280         int i, num_vregs, ret = 0;
1282         qcadev = serdev_device_get_drvdata(hu->serdev);
1283         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1284             !qcadev->bt_power->vreg_bulk)
1285                 return -EINVAL;
1287         vregs = qcadev->bt_power->vreg_data->vregs;
1288         vreg_bulk = qcadev->bt_power->vreg_bulk;
1289         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1290         BT_DBG("on: %d", on);
1291         if (on && !qcadev->bt_power->vregs_on) {
1292                 for (i = 0; i < num_vregs; i++) {
1293                         ret = qca_enable_regulator(vregs[i],
1294                                                    vreg_bulk[i].consumer);
1295                         if (ret)
1296                                 break;
1297                 }
1299                 if (ret) {
1300                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1301                         /* turn off regulators which are enabled */
1302                         for (i = i - 1; i >= 0; i--)
1303                                 qca_disable_regulator(vregs[i],
1304                                                       vreg_bulk[i].consumer);
1305                 } else {
1306                         qcadev->bt_power->vregs_on = true;
1307                 }
1308         } else if (!on && qcadev->bt_power->vregs_on) {
1309                 /* turn off regulator in reverse order */
1310                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1311                 for ( ; i >= 0; i--)
1312                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1314                 qcadev->bt_power->vregs_on = false;
1315         }
1317         return ret;
1320 static int qca_init_regulators(struct qca_power *qca,
1321                                 const struct qca_vreg *vregs, size_t num_vregs)
1323         int i;
1325         qca->vreg_bulk = devm_kzalloc(qca->dev, num_vregs *
1326                                       sizeof(struct regulator_bulk_data),
1327                                       GFP_KERNEL);
1328         if (!qca->vreg_bulk)
1329                 return -ENOMEM;
1331         for (i = 0; i < num_vregs; i++)
1332                 qca->vreg_bulk[i].supply = vregs[i].name;
1334         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1337 static int qca_serdev_probe(struct serdev_device *serdev)
1339         struct qca_serdev *qcadev;
1340         const struct qca_vreg_data *data;
1341         int err;
1343         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1344         if (!qcadev)
1345                 return -ENOMEM;
1347         qcadev->serdev_hu.serdev = serdev;
1348         data = of_device_get_match_data(&serdev->dev);
1349         serdev_device_set_drvdata(serdev, qcadev);
1350         if (data && data->soc_type == QCA_WCN3990) {
1351                 qcadev->btsoc_type = QCA_WCN3990;
1352                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1353                                                 sizeof(struct qca_power),
1354                                                 GFP_KERNEL);
1355                 if (!qcadev->bt_power)
1356                         return -ENOMEM;
1358                 qcadev->bt_power->dev = &serdev->dev;
1359                 qcadev->bt_power->vreg_data = data;
1360                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1361                                           data->num_vregs);
1362                 if (err) {
1363                         BT_ERR("Failed to init regulators:%d", err);
1364                         goto out;
1365                 }
1367                 qcadev->bt_power->vregs_on = false;
1369                 device_property_read_u32(&serdev->dev, "max-speed",
1370                                          &qcadev->oper_speed);
1371                 if (!qcadev->oper_speed)
1372                         BT_DBG("UART will pick default operating speed");
1374                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1375                 if (err) {
1376                         BT_ERR("wcn3990 serdev registration failed");
1377                         goto out;
1378                 }
1379         } else {
1380                 qcadev->btsoc_type = QCA_ROME;
1381                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1382                                                GPIOD_OUT_LOW);
1383                 if (IS_ERR(qcadev->bt_en)) {
1384                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1385                         return PTR_ERR(qcadev->bt_en);
1386                 }
1388                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1389                 if (IS_ERR(qcadev->susclk)) {
1390                         dev_err(&serdev->dev, "failed to acquire clk\n");
1391                         return PTR_ERR(qcadev->susclk);
1392                 }
1394                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1395                 if (err)
1396                         return err;
1398                 err = clk_prepare_enable(qcadev->susclk);
1399                 if (err)
1400                         return err;
1402                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1403                 if (err)
1404                         clk_disable_unprepare(qcadev->susclk);
1405         }
1407 out:    return err;
1411 static void qca_serdev_remove(struct serdev_device *serdev)
1413         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1415         if (qcadev->btsoc_type == QCA_WCN3990)
1416                 qca_power_shutdown(qcadev->serdev_hu.hdev);
1417         else
1418                 clk_disable_unprepare(qcadev->susclk);
1420         hci_uart_unregister_device(&qcadev->serdev_hu);
1423 static const struct of_device_id qca_bluetooth_of_match[] = {
1424         { .compatible = "qcom,qca6174-bt" },
1425         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
1426         { /* sentinel */ }
1427 };
1428 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1430 static struct serdev_device_driver qca_serdev_driver = {
1431         .probe = qca_serdev_probe,
1432         .remove = qca_serdev_remove,
1433         .driver = {
1434                 .name = "hci_uart_qca",
1435                 .of_match_table = qca_bluetooth_of_match,
1436         },
1437 };
1439 int __init qca_init(void)
1441         serdev_device_driver_register(&qca_serdev_driver);
1443         return hci_uart_register_proto(&qca_proto);
1446 int __exit qca_deinit(void)
1448         serdev_device_driver_unregister(&qca_serdev_driver);
1450         return hci_uart_unregister_proto(&qca_proto);