misc: ti-st: st_kim: remove the driver

This driver has only ever been used by the omap4-panda board file. This
file has been gone for over 10 years. Let it go.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20241016094117.16654-1-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

7 files changed, 0 insertions, 1941 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 3fe7e2a9bd29..0d46b8388331 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -613,7 +613,6 @@ config MARVELL_CN10K_DPI
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
-source "drivers/misc/ti-st/Kconfig"
 source "drivers/misc/lis3lv02d/Kconfig"
 source "drivers/misc/altera-stapl/Kconfig"
 source "drivers/misc/mei/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index a9f94525e181..d6e7c6d62db0 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -40,7 +40,6 @@ obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmw_balloon.o
 obj-$(CONFIG_PCH_PHUB)		+= pch_phub.o
-obj-y				+= ti-st/
 obj-y				+= lis3lv02d/
 obj-$(CONFIG_ALTERA_STAPL)	+=altera-stapl/
 obj-$(CONFIG_INTEL_MEI)		+= mei/
diff --git a/drivers/misc/ti-st/Kconfig b/drivers/misc/ti-st/Kconfig
deleted file mode 100644
index 1503a6496f63..000000000000
--- a/drivers/misc/ti-st/Kconfig
+++ /dev/null
@@ -1,19 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# TI's shared transport line discipline and the protocol
-# drivers (BT, FM and GPS)
-#
-menu "Texas Instruments shared transport line discipline"
-config TI_ST
-	tristate "Shared transport core driver"
-	depends on NET && TTY
-	depends on GPIOLIB || COMPILE_TEST
-	select FW_LOADER
-	help
-	  This enables the shared transport core driver for TI
-	  BT / FM and GPS combo chips. This enables protocol drivers
-	  to register themselves with core and send data, the responses
-	  are returned to relevant protocol drivers based on their
-	  packet types.
-
-endmenu
diff --git a/drivers/misc/ti-st/Makefile b/drivers/misc/ti-st/Makefile
deleted file mode 100644
index 93393100952e..000000000000
--- a/drivers/misc/ti-st/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile for TI's shared transport line discipline
-# and its protocol drivers (BT, FM, GPS)
-#
-obj-$(CONFIG_TI_ST) 		+= st_drv.o
-st_drv-objs			:= st_core.o st_kim.o st_ll.o
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
deleted file mode 100644
index b878431553ab..000000000000
--- a/drivers/misc/ti-st/st_core.c
+++ /dev/null
@@ -1,918 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Shared Transport Line discipline driver Core
- *	This hooks up ST KIM driver and ST LL driver
- *  Copyright (C) 2009-2010 Texas Instruments
- *  Author: Pavan Savoy <pavan_savoy@ti.com>
- */
-
-#define pr_fmt(fmt)	"(stc): " fmt
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/tty.h>
-
-#include <linux/seq_file.h>
-#include <linux/skbuff.h>
-
-#include <linux/ti_wilink_st.h>
-#include <linux/netdevice.h>
-
-/*
- * function pointer pointing to either,
- * st_kim_recv during registration to receive fw download responses
- * st_int_recv after registration to receive proto stack responses
- */
-static void (*st_recv)(void *disc_data, const u8 *ptr, size_t count);
-
-/********************************************************************/
-static void add_channel_to_table(struct st_data_s *st_gdata,
-		struct st_proto_s *new_proto)
-{
-	pr_info("%s: id %d\n", __func__, new_proto->chnl_id);
-	/* list now has the channel id as index itself */
-	st_gdata->list[new_proto->chnl_id] = new_proto;
-	st_gdata->is_registered[new_proto->chnl_id] = true;
-}
-
-static void remove_channel_from_table(struct st_data_s *st_gdata,
-		struct st_proto_s *proto)
-{
-	pr_info("%s: id %d\n", __func__, proto->chnl_id);
-/*	st_gdata->list[proto->chnl_id] = NULL; */
-	st_gdata->is_registered[proto->chnl_id] = false;
-}
-
-/*
- * called from KIM during firmware download.
- *
- * This is a wrapper function to tty->ops->write_room.
- * It returns number of free space available in
- * uart tx buffer.
- */
-int st_get_uart_wr_room(struct st_data_s *st_gdata)
-{
-	if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
-		pr_err("tty unavailable to perform write");
-		return -1;
-	}
-
-	return tty_write_room(st_gdata->tty);
-}
-
-/*
- * can be called in from
- * -- KIM (during fw download)
- * -- ST Core (during st_write)
- *
- *  This is the internal write function - a wrapper
- *  to tty->ops->write
- */
-int st_int_write(struct st_data_s *st_gdata,
-	const unsigned char *data, int count)
-{
-	struct tty_struct *tty;
-	if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
-		pr_err("tty unavailable to perform write");
-		return -EINVAL;
-	}
-	tty = st_gdata->tty;
-#ifdef VERBOSE
-	print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE,
-		16, 1, data, count, 0);
-#endif
-	return tty->ops->write(tty, data, count);
-
-}
-
-/*
- * push the skb received to relevant
- * protocol stacks
- */
-static void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata)
-{
-	pr_debug(" %s(prot:%d) ", __func__, chnl_id);
-
-	if (unlikely
-	    (st_gdata == NULL || st_gdata->rx_skb == NULL
-	     || st_gdata->is_registered[chnl_id] == false)) {
-		pr_err("chnl_id %d not registered, no data to send?",
-			   chnl_id);
-		kfree_skb(st_gdata->rx_skb);
-		return;
-	}
-	/*
-	 * this cannot fail
-	 * this shouldn't take long
-	 * - should be just skb_queue_tail for the
-	 *   protocol stack driver
-	 */
-	if (likely(st_gdata->list[chnl_id]->recv != NULL)) {
-		if (unlikely
-			(st_gdata->list[chnl_id]->recv
-			(st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb)
-			     != 0)) {
-			pr_err(" proto stack %d's ->recv failed", chnl_id);
-			kfree_skb(st_gdata->rx_skb);
-			return;
-		}
-	} else {
-		pr_err(" proto stack %d's ->recv null", chnl_id);
-		kfree_skb(st_gdata->rx_skb);
-	}
-	return;
-}
-
-/*
- * st_reg_complete - to call registration complete callbacks
- * of all protocol stack drivers
- * This function is being called with spin lock held, protocol drivers are
- * only expected to complete their waits and do nothing more than that.
- */
-static void st_reg_complete(struct st_data_s *st_gdata, int err)
-{
-	unsigned char i = 0;
-	pr_info(" %s ", __func__);
-	for (i = 0; i < ST_MAX_CHANNELS; i++) {
-		if (likely(st_gdata != NULL &&
-			st_gdata->is_registered[i] == true &&
-				st_gdata->list[i]->reg_complete_cb != NULL)) {
-			st_gdata->list[i]->reg_complete_cb
-				(st_gdata->list[i]->priv_data, err);
-			pr_info("protocol %d's cb sent %d\n", i, err);
-			if (err) { /* cleanup registered protocol */
-				st_gdata->is_registered[i] = false;
-				if (st_gdata->protos_registered)
-					st_gdata->protos_registered--;
-			}
-		}
-	}
-}
-
-static inline int st_check_data_len(struct st_data_s *st_gdata,
-	unsigned char chnl_id, int len)
-{
-	int room = skb_tailroom(st_gdata->rx_skb);
-
-	pr_debug("len %d room %d", len, room);
-
-	if (!len) {
-		/*
-		 * Received packet has only packet header and
-		 * has zero length payload. So, ask ST CORE to
-		 * forward the packet to protocol driver (BT/FM/GPS)
-		 */
-		st_send_frame(chnl_id, st_gdata);
-
-	} else if (len > room) {
-		/*
-		 * Received packet's payload length is larger.
-		 * We can't accommodate it in created skb.
-		 */
-		pr_err("Data length is too large len %d room %d", len,
-			   room);
-		kfree_skb(st_gdata->rx_skb);
-	} else {
-		/*
-		 * Packet header has non-zero payload length and
-		 * we have enough space in created skb. Lets read
-		 * payload data */
-		st_gdata->rx_state = ST_W4_DATA;
-		st_gdata->rx_count = len;
-		return len;
-	}
-
-	/* Change ST state to continue to process next packet */
-	st_gdata->rx_state = ST_W4_PACKET_TYPE;
-	st_gdata->rx_skb = NULL;
-	st_gdata->rx_count = 0;
-	st_gdata->rx_chnl = 0;
-
-	return 0;
-}
-
-/*
- * st_wakeup_ack - internal function for action when wake-up ack
- *	received
- */
-static inline void st_wakeup_ack(struct st_data_s *st_gdata,
-	unsigned char cmd)
-{
-	struct sk_buff *waiting_skb;
-	unsigned long flags = 0;
-
-	spin_lock_irqsave(&st_gdata->lock, flags);
-	/*
-	 * de-Q from waitQ and Q in txQ now that the
-	 * chip is awake
-	 */
-	while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq)))
-		skb_queue_tail(&st_gdata->txq, waiting_skb);
-
-	/* state forwarded to ST LL */
-	st_ll_sleep_state(st_gdata, (unsigned long)cmd);
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-
-	/* wake up to send the recently copied skbs from waitQ */
-	st_tx_wakeup(st_gdata);
-}
-
-/*
- * st_int_recv - ST's internal receive function.
- *	Decodes received RAW data and forwards to corresponding
- *	client drivers (Bluetooth,FM,GPS..etc).
- *	This can receive various types of packets,
- *	HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
- *	CH-8 packets from FM, CH-9 packets from GPS cores.
- */
-static void st_int_recv(void *disc_data, const u8 *ptr, size_t count)
-{
-	struct st_proto_s *proto;
-	unsigned short payload_len = 0;
-	int len = 0;
-	unsigned char type = 0;
-	unsigned char *plen;
-	struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
-	unsigned long flags;
-
-	if (st_gdata == NULL) {
-		pr_err(" received null from TTY ");
-		return;
-	}
-
-	pr_debug("count %zu rx_state %ld"
-		   "rx_count %ld", count, st_gdata->rx_state,
-		   st_gdata->rx_count);
-
-	spin_lock_irqsave(&st_gdata->lock, flags);
-	/* Decode received bytes here */
-	while (count) {
-		if (st_gdata->rx_count) {
-			len = min_t(unsigned int, st_gdata->rx_count, count);
-			skb_put_data(st_gdata->rx_skb, ptr, len);
-			st_gdata->rx_count -= len;
-			count -= len;
-			ptr += len;
-
-			if (st_gdata->rx_count)
-				continue;
-
-			/* Check ST RX state machine , where are we? */
-			switch (st_gdata->rx_state) {
-			/* Waiting for complete packet ? */
-			case ST_W4_DATA:
-				pr_debug("Complete pkt received");
-				/*
-				 * Ask ST CORE to forward
-				 * the packet to protocol driver
-				 */
-				st_send_frame(st_gdata->rx_chnl, st_gdata);
-
-				st_gdata->rx_state = ST_W4_PACKET_TYPE;
-				st_gdata->rx_skb = NULL;
-				continue;
-			/* parse the header to know details */
-			case ST_W4_HEADER:
-				proto = st_gdata->list[st_gdata->rx_chnl];
-				plen =
-				&st_gdata->rx_skb->data
-				[proto->offset_len_in_hdr];
-				pr_debug("plen pointing to %x\n", *plen);
-				if (proto->len_size == 1) /* 1 byte len field */
-					payload_len = *(unsigned char *)plen;
-				else if (proto->len_size == 2)
-					payload_len =
-					__le16_to_cpu(*(unsigned short *)plen);
-				else
-					pr_info("%s: invalid length "
-					"for id %d\n",
-					__func__, proto->chnl_id);
-				st_check_data_len(st_gdata, proto->chnl_id,
-						payload_len);
-				pr_debug("off %d, pay len %d\n",
-					proto->offset_len_in_hdr, payload_len);
-				continue;
-			}	/* end of switch rx_state */
-		}
-
-		/* end of if rx_count */
-
-		/*
-		 * Check first byte of packet and identify module
-		 * owner (BT/FM/GPS)
-		 */
-		switch (*ptr) {
-		case LL_SLEEP_IND:
-		case LL_SLEEP_ACK:
-		case LL_WAKE_UP_IND:
-			pr_debug("PM packet");
-			/*
-			 * this takes appropriate action based on
-			 * sleep state received --
-			 */
-			st_ll_sleep_state(st_gdata, *ptr);
-			/*
-			 * if WAKEUP_IND collides copy from waitq to txq
-			 * and assume chip awake
-			 */
-			spin_unlock_irqrestore(&st_gdata->lock, flags);
-			if (st_ll_getstate(st_gdata) == ST_LL_AWAKE)
-				st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK);
-			spin_lock_irqsave(&st_gdata->lock, flags);
-
-			ptr++;
-			count--;
-			continue;
-		case LL_WAKE_UP_ACK:
-			pr_debug("PM packet");
-
-			spin_unlock_irqrestore(&st_gdata->lock, flags);
-			/* wake up ack received */
-			st_wakeup_ack(st_gdata, *ptr);
-			spin_lock_irqsave(&st_gdata->lock, flags);
-
-			ptr++;
-			count--;
-			continue;
-			/* Unknown packet? */
-		default:
-			type = *ptr;
-
-			/*
-			 * Default case means non-HCILL packets,
-			 * possibilities are packets for:
-			 * (a) valid protocol -  Supported Protocols within
-			 *     the ST_MAX_CHANNELS.
-			 * (b) registered protocol - Checked by
-			 *     "st_gdata->list[type] == NULL)" are supported
-			 *     protocols only.
-			 *  Rules out any invalid protocol and
-			 *  unregistered protocols with channel ID < 16.
-			 */
-
-			if ((type >= ST_MAX_CHANNELS) ||
-					(st_gdata->list[type] == NULL)) {
-				pr_err("chip/interface misbehavior: "
-						"dropping frame starting "
-						"with 0x%02x\n", type);
-				goto done;
-			}
-
-			st_gdata->rx_skb = alloc_skb(
-					st_gdata->list[type]->max_frame_size,
-					GFP_ATOMIC);
-			if (st_gdata->rx_skb == NULL) {
-				pr_err("out of memory: dropping\n");
-				goto done;
-			}
-
-			skb_reserve(st_gdata->rx_skb,
-					st_gdata->list[type]->reserve);
-			/* next 2 required for BT only */
-			st_gdata->rx_skb->cb[0] = type; /*pkt_type*/
-			st_gdata->rx_skb->cb[1] = 0; /*incoming*/
-			st_gdata->rx_chnl = *ptr;
-			st_gdata->rx_state = ST_W4_HEADER;
-			st_gdata->rx_count = st_gdata->list[type]->hdr_len;
-			pr_debug("rx_count %ld\n", st_gdata->rx_count);
-		}
-		ptr++;
-		count--;
-	}
-done:
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-	pr_debug("done %s", __func__);
-	return;
-}
-
-/*
- * st_int_dequeue - internal de-Q function.
- *	If the previous data set was not written
- *	completely, return that skb which has the pending data.
- *	In normal cases, return top of txq.
- */
-static struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata)
-{
-	struct sk_buff *returning_skb;
-
-	pr_debug("%s", __func__);
-	if (st_gdata->tx_skb != NULL) {
-		returning_skb = st_gdata->tx_skb;
-		st_gdata->tx_skb = NULL;
-		return returning_skb;
-	}
-	return skb_dequeue(&st_gdata->txq);
-}
-
-/*
- * st_int_enqueue - internal Q-ing function.
- *	Will either Q the skb to txq or the tx_waitq
- *	depending on the ST LL state.
- *	If the chip is asleep, then Q it onto waitq and
- *	wakeup the chip.
- *	txq and waitq needs protection since the other contexts
- *	may be sending data, waking up chip.
- */
-static void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
-{
-	unsigned long flags = 0;
-
-	pr_debug("%s", __func__);
-	spin_lock_irqsave(&st_gdata->lock, flags);
-
-	switch (st_ll_getstate(st_gdata)) {
-	case ST_LL_AWAKE:
-		pr_debug("ST LL is AWAKE, sending normally");
-		skb_queue_tail(&st_gdata->txq, skb);
-		break;
-	case ST_LL_ASLEEP_TO_AWAKE:
-		skb_queue_tail(&st_gdata->tx_waitq, skb);
-		break;
-	case ST_LL_AWAKE_TO_ASLEEP:
-		pr_err("ST LL is illegal state(%ld),"
-			   "purging received skb.", st_ll_getstate(st_gdata));
-		dev_kfree_skb_irq(skb);
-		break;
-	case ST_LL_ASLEEP:
-		skb_queue_tail(&st_gdata->tx_waitq, skb);
-		st_ll_wakeup(st_gdata);
-		break;
-	default:
-		pr_err("ST LL is illegal state(%ld),"
-			   "purging received skb.", st_ll_getstate(st_gdata));
-		dev_kfree_skb_irq(skb);
-		break;
-	}
-
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-	pr_debug("done %s", __func__);
-	return;
-}
-
-/*
- * internal wakeup function
- * called from either
- * - TTY layer when write's finished
- * - st_write (in context of the protocol stack)
- */
-static void work_fn_write_wakeup(struct work_struct *work)
-{
-	struct st_data_s *st_gdata = container_of(work, struct st_data_s,
-			work_write_wakeup);
-
-	st_tx_wakeup((void *)st_gdata);
-}
-void st_tx_wakeup(struct st_data_s *st_data)
-{
-	struct sk_buff *skb;
-	unsigned long flags;	/* for irq save flags */
-	pr_debug("%s", __func__);
-	/* check for sending & set flag sending here */
-	if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
-		pr_debug("ST already sending");
-		/* keep sending */
-		set_bit(ST_TX_WAKEUP, &st_data->tx_state);
-		return;
-		/* TX_WAKEUP will be checked in another
-		 * context
-		 */
-	}
-	do {			/* come back if st_tx_wakeup is set */
-		/* woke-up to write */
-		clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
-		while ((skb = st_int_dequeue(st_data))) {
-			int len;
-			spin_lock_irqsave(&st_data->lock, flags);
-			/* enable wake-up from TTY */
-			set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
-			len = st_int_write(st_data, skb->data, skb->len);
-			skb_pull(skb, len);
-			/* if skb->len = len as expected, skb->len=0 */
-			if (skb->len) {
-				/* would be the next skb to be sent */
-				st_data->tx_skb = skb;
-				spin_unlock_irqrestore(&st_data->lock, flags);
-				break;
-			}
-			dev_kfree_skb_irq(skb);
-			spin_unlock_irqrestore(&st_data->lock, flags);
-		}
-		/* if wake-up is set in another context- restart sending */
-	} while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
-
-	/* clear flag sending */
-	clear_bit(ST_TX_SENDING, &st_data->tx_state);
-}
-
-/********************************************************************/
-/* functions called from ST KIM
-*/
-void kim_st_list_protocols(struct st_data_s *st_gdata, void *buf)
-{
-	seq_printf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
-			st_gdata->protos_registered,
-			st_gdata->is_registered[0x04] == true ? 'R' : 'U',
-			st_gdata->is_registered[0x08] == true ? 'R' : 'U',
-			st_gdata->is_registered[0x09] == true ? 'R' : 'U');
-}
-
-/********************************************************************/
-/*
- * functions called from protocol stack drivers
- * to be EXPORT-ed
- */
-long st_register(struct st_proto_s *new_proto)
-{
-	struct st_data_s	*st_gdata;
-	long err = 0;
-	unsigned long flags = 0;
-
-	st_kim_ref(&st_gdata, 0);
-	if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
-	    || new_proto->reg_complete_cb == NULL) {
-		pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
-		return -EINVAL;
-	}
-
-	if (new_proto->chnl_id >= ST_MAX_CHANNELS) {
-		pr_err("chnl_id %d not supported", new_proto->chnl_id);
-		return -EPROTONOSUPPORT;
-	}
-
-	if (st_gdata->is_registered[new_proto->chnl_id] == true) {
-		pr_err("chnl_id %d already registered", new_proto->chnl_id);
-		return -EALREADY;
-	}
-
-	/* can be from process context only */
-	spin_lock_irqsave(&st_gdata->lock, flags);
-
-	if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) {
-		pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->chnl_id);
-		/* fw download in progress */
-
-		add_channel_to_table(st_gdata, new_proto);
-		st_gdata->protos_registered++;
-		new_proto->write = st_write;
-
-		set_bit(ST_REG_PENDING, &st_gdata->st_state);
-		spin_unlock_irqrestore(&st_gdata->lock, flags);
-		return -EINPROGRESS;
-	} else if (st_gdata->protos_registered == ST_EMPTY) {
-		pr_info(" chnl_id list empty :%d ", new_proto->chnl_id);
-		set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
-		st_recv = st_kim_recv;
-
-		/* enable the ST LL - to set default chip state */
-		st_ll_enable(st_gdata);
-
-		/* release lock previously held - re-locked below */
-		spin_unlock_irqrestore(&st_gdata->lock, flags);
-
-		/*
-		 * this may take a while to complete
-		 * since it involves BT fw download
-		 */
-		err = st_kim_start(st_gdata->kim_data);
-		if (err != 0) {
-			clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
-			if ((st_gdata->protos_registered != ST_EMPTY) &&
-			    (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
-				pr_err(" KIM failure complete callback ");
-				spin_lock_irqsave(&st_gdata->lock, flags);
-				st_reg_complete(st_gdata, err);
-				spin_unlock_irqrestore(&st_gdata->lock, flags);
-				clear_bit(ST_REG_PENDING, &st_gdata->st_state);
-			}
-			return -EINVAL;
-		}
-
-		spin_lock_irqsave(&st_gdata->lock, flags);
-
-		clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
-		st_recv = st_int_recv;
-
-		/*
-		 * this is where all pending registration
-		 * are signalled to be complete by calling callback functions
-		 */
-		if ((st_gdata->protos_registered != ST_EMPTY) &&
-		    (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
-			pr_debug(" call reg complete callback ");
-			st_reg_complete(st_gdata, 0);
-		}
-		clear_bit(ST_REG_PENDING, &st_gdata->st_state);
-
-		/*
-		 * check for already registered once more,
-		 * since the above check is old
-		 */
-		if (st_gdata->is_registered[new_proto->chnl_id] == true) {
-			pr_err(" proto %d already registered ",
-				   new_proto->chnl_id);
-			spin_unlock_irqrestore(&st_gdata->lock, flags);
-			return -EALREADY;
-		}
-
-		add_channel_to_table(st_gdata, new_proto);
-		st_gdata->protos_registered++;
-		new_proto->write = st_write;
-		spin_unlock_irqrestore(&st_gdata->lock, flags);
-		return err;
-	}
-	/* if fw is already downloaded & new stack registers protocol */
-	else {
-		add_channel_to_table(st_gdata, new_proto);
-		st_gdata->protos_registered++;
-		new_proto->write = st_write;
-
-		/* lock already held before entering else */
-		spin_unlock_irqrestore(&st_gdata->lock, flags);
-		return err;
-	}
-}
-EXPORT_SYMBOL_GPL(st_register);
-
-/*
- * to unregister a protocol -
- * to be called from protocol stack driver
- */
-long st_unregister(struct st_proto_s *proto)
-{
-	long err = 0;
-	unsigned long flags = 0;
-	struct st_data_s	*st_gdata;
-
-	pr_debug("%s: %d ", __func__, proto->chnl_id);
-
-	st_kim_ref(&st_gdata, 0);
-	if (!st_gdata || proto->chnl_id >= ST_MAX_CHANNELS) {
-		pr_err(" chnl_id %d not supported", proto->chnl_id);
-		return -EPROTONOSUPPORT;
-	}
-
-	spin_lock_irqsave(&st_gdata->lock, flags);
-
-	if (st_gdata->is_registered[proto->chnl_id] == false) {
-		pr_err(" chnl_id %d not registered", proto->chnl_id);
-		spin_unlock_irqrestore(&st_gdata->lock, flags);
-		return -EPROTONOSUPPORT;
-	}
-
-	if (st_gdata->protos_registered)
-		st_gdata->protos_registered--;
-
-	remove_channel_from_table(st_gdata, proto);
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-
-	if ((st_gdata->protos_registered == ST_EMPTY) &&
-	    (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
-		pr_info(" all chnl_ids unregistered ");
-
-		/* stop traffic on tty */
-		if (st_gdata->tty) {
-			tty_ldisc_flush(st_gdata->tty);
-			stop_tty(st_gdata->tty);
-		}
-
-		/* all chnl_ids now unregistered */
-		st_kim_stop(st_gdata->kim_data);
-		/* disable ST LL */
-		st_ll_disable(st_gdata);
-	}
-	return err;
-}
-
-/*
- * called in protocol stack drivers
- * via the write function pointer
- */
-long st_write(struct sk_buff *skb)
-{
-	struct st_data_s *st_gdata;
-	long len;
-
-	st_kim_ref(&st_gdata, 0);
-	if (unlikely(skb == NULL || st_gdata == NULL
-		|| st_gdata->tty == NULL)) {
-		pr_err("data/tty unavailable to perform write");
-		return -EINVAL;
-	}
-
-	pr_debug("%d to be written", skb->len);
-	len = skb->len;
-
-	/* st_ll to decide where to enqueue the skb */
-	st_int_enqueue(st_gdata, skb);
-	/* wake up */
-	st_tx_wakeup(st_gdata);
-
-	/* return number of bytes written */
-	return len;
-}
-
-/* for protocols making use of shared transport */
-EXPORT_SYMBOL_GPL(st_unregister);
-
-/********************************************************************/
-/*
- * functions called from TTY layer
- */
-static int st_tty_open(struct tty_struct *tty)
-{
-	struct st_data_s *st_gdata;
-	pr_info("%s ", __func__);
-
-	st_kim_ref(&st_gdata, 0);
-	st_gdata->tty = tty;
-	tty->disc_data = st_gdata;
-
-	/* don't do an wakeup for now */
-	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
-
-	/* mem already allocated
-	 */
-	tty->receive_room = 65536;
-	/* Flush any pending characters in the driver and discipline. */
-	tty_ldisc_flush(tty);
-	tty_driver_flush_buffer(tty);
-	/*
-	 * signal to UIM via KIM that -
-	 * installation of N_TI_WL ldisc is complete
-	 */
-	st_kim_complete(st_gdata->kim_data);
-	pr_debug("done %s", __func__);
-
-	return 0;
-}
-
-static void st_tty_close(struct tty_struct *tty)
-{
-	unsigned char i;
-	unsigned long flags;
-	struct	st_data_s *st_gdata = tty->disc_data;
-
-	pr_info("%s ", __func__);
-
-	/*
-	 * TODO:
-	 * if a protocol has been registered & line discipline
-	 * un-installed for some reason - what should be done ?
-	 */
-	spin_lock_irqsave(&st_gdata->lock, flags);
-	for (i = ST_BT; i < ST_MAX_CHANNELS; i++) {
-		if (st_gdata->is_registered[i] == true)
-			pr_err("%d not un-registered", i);
-		st_gdata->list[i] = NULL;
-		st_gdata->is_registered[i] = false;
-	}
-	st_gdata->protos_registered = 0;
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-	/*
-	 * signal to UIM via KIM that -
-	 * N_TI_WL ldisc is un-installed
-	 */
-	st_kim_complete(st_gdata->kim_data);
-	st_gdata->tty = NULL;
-	/* Flush any pending characters in the driver and discipline. */
-	tty_ldisc_flush(tty);
-	tty_driver_flush_buffer(tty);
-
-	spin_lock_irqsave(&st_gdata->lock, flags);
-	/* empty out txq and tx_waitq */
-	skb_queue_purge(&st_gdata->txq);
-	skb_queue_purge(&st_gdata->tx_waitq);
-	/* reset the TTY Rx states of ST */
-	st_gdata->rx_count = 0;
-	st_gdata->rx_state = ST_W4_PACKET_TYPE;
-	kfree_skb(st_gdata->rx_skb);
-	st_gdata->rx_skb = NULL;
-	spin_unlock_irqrestore(&st_gdata->lock, flags);
-
-	pr_debug("%s: done ", __func__);
-}
-
-static void st_tty_receive(struct tty_struct *tty, const u8 *data,
-			   const u8 *tty_flags, size_t count)
-{
-#ifdef VERBOSE
-	print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE,
-		16, 1, data, count, 0);
-#endif
-
-	/*
-	 * if fw download is in progress then route incoming data
-	 * to KIM for validation
-	 */
-	st_recv(tty->disc_data, data, count);
-	pr_debug("done %s", __func__);
-}
-
-/*
- * wake-up function called in from the TTY layer
- * inside the internal wakeup function will be called
- */
-static void st_tty_wakeup(struct tty_struct *tty)
-{
-	struct	st_data_s *st_gdata = tty->disc_data;
-	pr_debug("%s ", __func__);
-	/* don't do an wakeup for now */
-	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
-
-	/*
-	 * schedule the internal wakeup instead of calling directly to
-	 * avoid lockup (port->lock needed in tty->ops->write is
-	 * already taken here
-	 */
-	schedule_work(&st_gdata->work_write_wakeup);
-}
-
-static void st_tty_flush_buffer(struct tty_struct *tty)
-{
-	struct	st_data_s *st_gdata = tty->disc_data;
-	pr_debug("%s ", __func__);
-
-	kfree_skb(st_gdata->tx_skb);
-	st_gdata->tx_skb = NULL;
-
-	tty_driver_flush_buffer(tty);
-	return;
-}
-
-static struct tty_ldisc_ops st_ldisc_ops = {
-	.num = N_TI_WL,
-	.name = "n_st",
-	.open = st_tty_open,
-	.close = st_tty_close,
-	.receive_buf = st_tty_receive,
-	.write_wakeup = st_tty_wakeup,
-	.flush_buffer = st_tty_flush_buffer,
-	.owner = THIS_MODULE
-};
-
-/********************************************************************/
-int st_core_init(struct st_data_s **core_data)
-{
-	struct st_data_s *st_gdata;
-	long err;
-
-	err = tty_register_ldisc(&st_ldisc_ops);
-	if (err) {
-		pr_err("error registering %d line discipline %ld",
-			   N_TI_WL, err);
-		return err;
-	}
-	pr_debug("registered n_shared line discipline");
-
-	st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
-	if (!st_gdata) {
-		pr_err("memory allocation failed");
-		err = -ENOMEM;
-		goto err_unreg_ldisc;
-	}
-
-	/* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
-	 * will be pushed in this queue for actual transmission.
-	 */
-	skb_queue_head_init(&st_gdata->txq);
-	skb_queue_head_init(&st_gdata->tx_waitq);
-
-	/* Locking used in st_int_enqueue() to avoid multiple execution */
-	spin_lock_init(&st_gdata->lock);
-
-	err = st_ll_init(st_gdata);
-	if (err) {
-		pr_err("error during st_ll initialization(%ld)", err);
-		goto err_free_gdata;
-	}
-
-	INIT_WORK(&st_gdata->work_write_wakeup, work_fn_write_wakeup);
-
-	*core_data = st_gdata;
-	return 0;
-err_free_gdata:
-	kfree(st_gdata);
-err_unreg_ldisc:
-	tty_unregister_ldisc(&st_ldisc_ops);
-	return err;
-}
-
-void st_core_exit(struct st_data_s *st_gdata)
-{
-	long err;
-	/* internal module cleanup */
-	err = st_ll_deinit(st_gdata);
-	if (err)
-		pr_err("error during deinit of ST LL %ld", err);
-
-	if (st_gdata != NULL) {
-		/* Free ST Tx Qs and skbs */
-		skb_queue_purge(&st_gdata->txq);
-		skb_queue_purge(&st_gdata->tx_waitq);
-		kfree_skb(st_gdata->rx_skb);
-		kfree_skb(st_gdata->tx_skb);
-		/* TTY ldisc cleanup */
-		tty_unregister_ldisc(&st_ldisc_ops);
-		/* free the global data pointer */
-		kfree(st_gdata);
-	}
-}
diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
deleted file mode 100644
index ff172cf4614d..000000000000
--- a/drivers/misc/ti-st/st_kim.c
+++ /dev/null
@@ -1,839 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Shared Transport Line discipline driver Core
- *	Init Manager module responsible for GPIO control
- *	and firmware download
- *  Copyright (C) 2009-2010 Texas Instruments
- *  Author: Pavan Savoy <pavan_savoy@ti.com>
- */
-
-#define pr_fmt(fmt) "(stk) :" fmt
-#include <linux/platform_device.h>
-#include <linux/jiffies.h>
-#include <linux/firmware.h>
-#include <linux/delay.h>
-#include <linux/wait.h>
-#include <linux/gpio.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <linux/sched.h>
-#include <linux/sysfs.h>
-#include <linux/tty.h>
-
-#include <linux/skbuff.h>
-#include <linux/ti_wilink_st.h>
-#include <linux/module.h>
-
-#define MAX_ST_DEVICES	3	/* Imagine 1 on each UART for now */
-static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
-
-/**********************************************************************/
-/* internal functions */
-
-/*
- * st_get_plat_device -
- *	function which returns the reference to the platform device
- *	requested by id. As of now only 1 such device exists (id=0)
- *	the context requesting for reference can get the id to be
- *	requested by a. The protocol driver which is registering or
- *	b. the tty device which is opened.
- */
-static struct platform_device *st_get_plat_device(int id)
-{
-	return st_kim_devices[id];
-}
-
-/*
- * validate_firmware_response -
- *	function to return whether the firmware response was proper
- *	in case of error don't complete so that waiting for proper
- *	response times out
- */
-static void validate_firmware_response(struct kim_data_s *kim_gdata)
-{
-	struct sk_buff *skb = kim_gdata->rx_skb;
-	if (!skb)
-		return;
-
-	/*
-	 * these magic numbers are the position in the response buffer which
-	 * allows us to distinguish whether the response is for the read
-	 * version info. command
-	 */
-	if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
-			skb->data[4] == 0x10 && skb->data[5] == 0x00) {
-		/* fw version response */
-		memcpy(kim_gdata->resp_buffer,
-				kim_gdata->rx_skb->data,
-				kim_gdata->rx_skb->len);
-		kim_gdata->rx_state = ST_W4_PACKET_TYPE;
-		kim_gdata->rx_skb = NULL;
-		kim_gdata->rx_count = 0;
-	} else if (unlikely(skb->data[5] != 0)) {
-		pr_err("no proper response during fw download");
-		pr_err("data6 %x", skb->data[5]);
-		kfree_skb(skb);
-		return;		/* keep waiting for the proper response */
-	}
-	/* becos of all the script being downloaded */
-	complete_all(&kim_gdata->kim_rcvd);
-	kfree_skb(skb);
-}
-
-/*
- * check for data len received inside kim_int_recv
- * most often hit the last case to update state to waiting for data
- */
-static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
-{
-	register int room = skb_tailroom(kim_gdata->rx_skb);
-
-	pr_debug("len %d room %d", len, room);
-
-	if (!len) {
-		validate_firmware_response(kim_gdata);
-	} else if (len > room) {
-		/*
-		 * Received packet's payload length is larger.
-		 * We can't accommodate it in created skb.
-		 */
-		pr_err("Data length is too large len %d room %d", len,
-			   room);
-		kfree_skb(kim_gdata->rx_skb);
-	} else {
-		/*
-		 * Packet header has non-zero payload length and
-		 * we have enough space in created skb. Lets read
-		 * payload data */
-		kim_gdata->rx_state = ST_W4_DATA;
-		kim_gdata->rx_count = len;
-		return len;
-	}
-
-	/*
-	 * Change ST LL state to continue to process next
-	 * packet
-	 */
-	kim_gdata->rx_state = ST_W4_PACKET_TYPE;
-	kim_gdata->rx_skb = NULL;
-	kim_gdata->rx_count = 0;
-
-	return 0;
-}
-
-/*
- * kim_int_recv - receive function called during firmware download
- *	firmware download responses on different UART drivers
- *	have been observed to come in bursts of different
- *	tty_receive and hence the logic
- */
-static void kim_int_recv(struct kim_data_s *kim_gdata, const u8 *ptr,
-			 size_t count)
-{
-	int len = 0;
-	unsigned char *plen;
-
-	pr_debug("%s", __func__);
-	/* Decode received bytes here */
-	while (count) {
-		if (kim_gdata->rx_count) {
-			len = min_t(unsigned int, kim_gdata->rx_count, count);
-			skb_put_data(kim_gdata->rx_skb, ptr, len);
-			kim_gdata->rx_count -= len;
-			count -= len;
-			ptr += len;
-
-			if (kim_gdata->rx_count)
-				continue;
-
-			/* Check ST RX state machine , where are we? */
-			switch (kim_gdata->rx_state) {
-				/* Waiting for complete packet ? */
-			case ST_W4_DATA:
-				pr_debug("Complete pkt received");
-				validate_firmware_response(kim_gdata);
-				kim_gdata->rx_state = ST_W4_PACKET_TYPE;
-				kim_gdata->rx_skb = NULL;
-				continue;
-				/* Waiting for Bluetooth event header ? */
-			case ST_W4_HEADER:
-				plen =
-				(unsigned char *)&kim_gdata->rx_skb->data[1];
-				pr_debug("event hdr: plen 0x%02x\n", *plen);
-				kim_check_data_len(kim_gdata, *plen);
-				continue;
-			}	/* end of switch */
-		}		/* end of if rx_state */
-		switch (*ptr) {
-			/* Bluetooth event packet? */
-		case 0x04:
-			kim_gdata->rx_state = ST_W4_HEADER;
-			kim_gdata->rx_count = 2;
-			break;
-		default:
-			pr_info("unknown packet");
-			ptr++;
-			count--;
-			continue;
-		}
-		ptr++;
-		count--;
-		kim_gdata->rx_skb =
-			alloc_skb(1024+8, GFP_ATOMIC);
-		if (!kim_gdata->rx_skb) {
-			pr_err("can't allocate mem for new packet");
-			kim_gdata->rx_state = ST_W4_PACKET_TYPE;
-			kim_gdata->rx_count = 0;
-			return;
-		}
-		skb_reserve(kim_gdata->rx_skb, 8);
-		kim_gdata->rx_skb->cb[0] = 4;
-		kim_gdata->rx_skb->cb[1] = 0;
-
-	}
-	return;
-}
-
-static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
-{
-	unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
-	static const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
-	long time_left;
-
-	pr_debug("%s", __func__);
-
-	reinit_completion(&kim_gdata->kim_rcvd);
-	if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
-		pr_err("kim: couldn't write 4 bytes");
-		return -EIO;
-	}
-
-	time_left = wait_for_completion_interruptible_timeout(
-		&kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
-	if (time_left <= 0) {
-		pr_err(" waiting for ver info- timed out or received signal");
-		return time_left ? -ERESTARTSYS : -ETIMEDOUT;
-	}
-	reinit_completion(&kim_gdata->kim_rcvd);
-	/*
-	 * the positions 12 & 13 in the response buffer provide with the
-	 * chip, major & minor numbers
-	 */
-
-	version =
-		MAKEWORD(kim_gdata->resp_buffer[12],
-				kim_gdata->resp_buffer[13]);
-	chip = (version & 0x7C00) >> 10;
-	min_ver = (version & 0x007F);
-	maj_ver = (version & 0x0380) >> 7;
-
-	if (version & 0x8000)
-		maj_ver |= 0x0008;
-
-	sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
-		chip, maj_ver, min_ver);
-
-	/* to be accessed later via sysfs entry */
-	kim_gdata->version.full = version;
-	kim_gdata->version.chip = chip;
-	kim_gdata->version.maj_ver = maj_ver;
-	kim_gdata->version.min_ver = min_ver;
-
-	pr_info("%s", bts_scr_name);
-	return 0;
-}
-
-static void skip_change_remote_baud(unsigned char **ptr, long *len)
-{
-	unsigned char *nxt_action, *cur_action;
-	cur_action = *ptr;
-
-	nxt_action = cur_action + sizeof(struct bts_action) +
-		((struct bts_action *) cur_action)->size;
-
-	if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
-		pr_err("invalid action after change remote baud command");
-	} else {
-		*ptr = *ptr + sizeof(struct bts_action) +
-			((struct bts_action *)cur_action)->size;
-		*len = *len - (sizeof(struct bts_action) +
-				((struct bts_action *)cur_action)->size);
-		/* warn user on not commenting these in firmware */
-		pr_warn("skipping the wait event of change remote baud");
-	}
-}
-
-/*
- * download_firmware -
- *	internal function which parses through the .bts firmware
- *	script file intreprets SEND, DELAY actions only as of now
- */
-static long download_firmware(struct kim_data_s *kim_gdata)
-{
-	long err = 0;
-	long len = 0;
-	unsigned char *ptr = NULL;
-	unsigned char *action_ptr = NULL;
-	unsigned char bts_scr_name[40] = { 0 };	/* 40 char long bts scr name? */
-	int wr_room_space;
-	int cmd_size;
-	unsigned long timeout;
-
-	err = read_local_version(kim_gdata, bts_scr_name);
-	if (err != 0) {
-		pr_err("kim: failed to read local ver");
-		return err;
-	}
-	err =
-	    request_firmware(&kim_gdata->fw_entry, bts_scr_name,
-			     &kim_gdata->kim_pdev->dev);
-	if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
-		     (kim_gdata->fw_entry->size == 0))) {
-		pr_err(" request_firmware failed(errno %ld) for %s", err,
-			   bts_scr_name);
-		return -EINVAL;
-	}
-	ptr = (void *)kim_gdata->fw_entry->data;
-	len = kim_gdata->fw_entry->size;
-	/*
-	 * bts_header to remove out magic number and
-	 * version
-	 */
-	ptr += sizeof(struct bts_header);
-	len -= sizeof(struct bts_header);
-
-	while (len > 0 && ptr) {
-		pr_debug(" action size %d, type %d ",
-			   ((struct bts_action *)ptr)->size,
-			   ((struct bts_action *)ptr)->type);
-
-		switch (((struct bts_action *)ptr)->type) {
-		case ACTION_SEND_COMMAND:	/* action send */
-			pr_debug("S");
-			action_ptr = &(((struct bts_action *)ptr)->data[0]);
-			if (unlikely
-			    (((struct hci_command *)action_ptr)->opcode ==
-			     0xFF36)) {
-				/*
-				 * ignore remote change
-				 * baud rate HCI VS command
-				 */
-				pr_warn("change remote baud"
-				    " rate command in firmware");
-				skip_change_remote_baud(&ptr, &len);
-				break;
-			}
-			/*
-			 * Make sure we have enough free space in uart
-			 * tx buffer to write current firmware command
-			 */
-			cmd_size = ((struct bts_action *)ptr)->size;
-			timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
-			do {
-				wr_room_space =
-					st_get_uart_wr_room(kim_gdata->core_data);
-				if (wr_room_space < 0) {
-					pr_err("Unable to get free "
-							"space info from uart tx buffer");
-					release_firmware(kim_gdata->fw_entry);
-					return wr_room_space;
-				}
-				mdelay(1); /* wait 1ms before checking room */
-			} while ((wr_room_space < cmd_size) &&
-					time_before(jiffies, timeout));
-
-			/* Timeout happened ? */
-			if (time_after_eq(jiffies, timeout)) {
-				pr_err("Timeout while waiting for free "
-						"free space in uart tx buffer");
-				release_firmware(kim_gdata->fw_entry);
-				return -ETIMEDOUT;
-			}
-			/*
-			 * reinit completion before sending for the
-			 * relevant wait
-			 */
-			reinit_completion(&kim_gdata->kim_rcvd);
-
-			/*
-			 * Free space found in uart buffer, call st_int_write
-			 * to send current firmware command to the uart tx
-			 * buffer.
-			 */
-			err = st_int_write(kim_gdata->core_data,
-			((struct bts_action_send *)action_ptr)->data,
-					   ((struct bts_action *)ptr)->size);
-			if (unlikely(err < 0)) {
-				release_firmware(kim_gdata->fw_entry);
-				return err;
-			}
-			/*
-			 * Check number of bytes written to the uart tx buffer
-			 * and requested command write size
-			 */
-			if (err != cmd_size) {
-				pr_err("Number of bytes written to uart "
-						"tx buffer are not matching with "
-						"requested cmd write size");
-				release_firmware(kim_gdata->fw_entry);
-				return -EIO;
-			}
-			break;
-		case ACTION_WAIT_EVENT:  /* wait */
-			pr_debug("W");
-			err = wait_for_completion_interruptible_timeout(
-					&kim_gdata->kim_rcvd,
-					msecs_to_jiffies(CMD_RESP_TIME));
-			if (err <= 0) {
-				pr_err("response timeout/signaled during fw download ");
-				/* timed out */
-				release_firmware(kim_gdata->fw_entry);
-				return err ? -ERESTARTSYS : -ETIMEDOUT;
-			}
-			reinit_completion(&kim_gdata->kim_rcvd);
-			break;
-		case ACTION_DELAY:	/* sleep */
-			pr_info("sleep command in scr");
-			action_ptr = &(((struct bts_action *)ptr)->data[0]);
-			mdelay(((struct bts_action_delay *)action_ptr)->msec);
-			break;
-		}
-		len =
-		    len - (sizeof(struct bts_action) +
-			   ((struct bts_action *)ptr)->size);
-		ptr =
-		    ptr + sizeof(struct bts_action) +
-		    ((struct bts_action *)ptr)->size;
-	}
-	/* fw download complete */
-	release_firmware(kim_gdata->fw_entry);
-	return 0;
-}
-
-/**********************************************************************/
-/* functions called from ST core */
-/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
- * can be because of
- * 1. response to read local version
- * 2. during send/recv's of firmware download
- */
-void st_kim_recv(void *disc_data, const u8 *data, size_t count)
-{
-	struct st_data_s	*st_gdata = (struct st_data_s *)disc_data;
-	struct kim_data_s	*kim_gdata = st_gdata->kim_data;
-
-	/*
-	 * proceed to gather all data and distinguish read fw version response
-	 * from other fw responses when data gathering is complete
-	 */
-	kim_int_recv(kim_gdata, data, count);
-	return;
-}
-
-/*
- * to signal completion of line discipline installation
- * called from ST Core, upon tty_open
- */
-void st_kim_complete(void *kim_data)
-{
-	struct kim_data_s	*kim_gdata = (struct kim_data_s *)kim_data;
-	complete(&kim_gdata->ldisc_installed);
-}
-
-/*
- * st_kim_start - called from ST Core upon 1st registration
- *	This involves toggling the chip enable gpio, reading
- *	the firmware version from chip, forming the fw file name
- *	based on the chip version, requesting the fw, parsing it
- *	and perform download(send/recv).
- */
-long st_kim_start(void *kim_data)
-{
-	long err = 0;
-	long retry = POR_RETRY_COUNT;
-	struct ti_st_plat_data	*pdata;
-	struct kim_data_s	*kim_gdata = (struct kim_data_s *)kim_data;
-
-	pr_info(" %s", __func__);
-	pdata = kim_gdata->kim_pdev->dev.platform_data;
-
-	do {
-		/* platform specific enabling code here */
-		if (pdata->chip_enable)
-			pdata->chip_enable(kim_gdata);
-
-		/* Configure BT nShutdown to HIGH state */
-		gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
-		mdelay(5);	/* FIXME: a proper toggle */
-		gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
-		mdelay(100);
-		/* re-initialize the completion */
-		reinit_completion(&kim_gdata->ldisc_installed);
-		/* send notification to UIM */
-		kim_gdata->ldisc_install = 1;
-		pr_info("ldisc_install = 1");
-		sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
-				NULL, "install");
-		/* wait for ldisc to be installed */
-		err = wait_for_completion_interruptible_timeout(
-			&kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
-		if (!err) {
-			/*
-			 * ldisc installation timeout,
-			 * flush uart, power cycle BT_EN
-			 */
-			pr_err("ldisc installation timeout");
-			err = st_kim_stop(kim_gdata);
-			continue;
-		} else {
-			/* ldisc installed now */
-			pr_info("line discipline installed");
-			err = download_firmware(kim_gdata);
-			if (err != 0) {
-				/*
-				 * ldisc installed but fw download failed,
-				 * flush uart & power cycle BT_EN
-				 */
-				pr_err("download firmware failed");
-				err = st_kim_stop(kim_gdata);
-				continue;
-			} else {	/* on success don't retry */
-				break;
-			}
-		}
-	} while (retry--);
-	return err;
-}
-
-/*
- * st_kim_stop - stop communication with chip.
- *	This can be called from ST Core/KIM, on the-
- *	(a) last un-register when chip need not be powered there-after,
- *	(b) upon failure to either install ldisc or download firmware.
- *	The function is responsible to (a) notify UIM about un-installation,
- *	(b) flush UART if the ldisc was installed.
- *	(c) reset BT_EN - pull down nshutdown at the end.
- *	(d) invoke platform's chip disabling routine.
- */
-long st_kim_stop(void *kim_data)
-{
-	long err = 0;
-	struct kim_data_s	*kim_gdata = (struct kim_data_s *)kim_data;
-	struct ti_st_plat_data	*pdata =
-		kim_gdata->kim_pdev->dev.platform_data;
-	struct tty_struct	*tty = kim_gdata->core_data->tty;
-
-	reinit_completion(&kim_gdata->ldisc_installed);
-
-	if (tty) {	/* can be called before ldisc is installed */
-		/* Flush any pending characters in the driver and discipline. */
-		tty_ldisc_flush(tty);
-		tty_driver_flush_buffer(tty);
-	}
-
-	/* send uninstall notification to UIM */
-	pr_info("ldisc_install = 0");
-	kim_gdata->ldisc_install = 0;
-	sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
-
-	/* wait for ldisc to be un-installed */
-	err = wait_for_completion_interruptible_timeout(
-		&kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
-	if (!err) {		/* timeout */
-		pr_err(" timed out waiting for ldisc to be un-installed");
-		err = -ETIMEDOUT;
-	}
-
-	/* By default configure BT nShutdown to LOW state */
-	gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
-	mdelay(1);
-	gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
-	mdelay(1);
-	gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
-
-	/* platform specific disable */
-	if (pdata->chip_disable)
-		pdata->chip_disable(kim_gdata);
-	return err;
-}
-
-/**********************************************************************/
-/* functions called from subsystems */
-/* called when debugfs entry is read from */
-
-static int version_show(struct seq_file *s, void *unused)
-{
-	struct kim_data_s *kim_gdata = s->private;
-	seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
-			kim_gdata->version.chip, kim_gdata->version.maj_ver,
-			kim_gdata->version.min_ver);
-	return 0;
-}
-
-static int list_show(struct seq_file *s, void *unused)
-{
-	struct kim_data_s *kim_gdata = s->private;
-	kim_st_list_protocols(kim_gdata->core_data, s);
-	return 0;
-}
-
-static ssize_t show_install(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", kim_data->ldisc_install);
-}
-
-#ifdef DEBUG
-static ssize_t store_dev_name(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	pr_debug("storing dev name >%s<", buf);
-	strscpy(kim_data->dev_name, buf, sizeof(kim_data->dev_name));
-	pr_debug("stored dev name >%s<", kim_data->dev_name);
-	return count;
-}
-
-static ssize_t store_baud_rate(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	pr_debug("storing baud rate >%s<", buf);
-	sscanf(buf, "%ld", &kim_data->baud_rate);
-	pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
-	return count;
-}
-#endif	/* if DEBUG */
-
-static ssize_t show_dev_name(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	return sprintf(buf, "%s\n", kim_data->dev_name);
-}
-
-static ssize_t show_baud_rate(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", kim_data->baud_rate);
-}
-
-static ssize_t show_flow_cntrl(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct kim_data_s *kim_data = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", kim_data->flow_cntrl);
-}
-
-/* structures specific for sysfs entries */
-static struct kobj_attribute ldisc_install =
-__ATTR(install, 0444, (void *)show_install, NULL);
-
-static struct kobj_attribute uart_dev_name =
-#ifdef DEBUG	/* TODO: move this to debug-fs if possible */
-__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
-#else
-__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
-#endif
-
-static struct kobj_attribute uart_baud_rate =
-#ifdef DEBUG	/* TODO: move to debugfs */
-__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
-#else
-__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
-#endif
-
-static struct kobj_attribute uart_flow_cntrl =
-__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
-
-static struct attribute *uim_attrs[] = {
-	&ldisc_install.attr,
-	&uart_dev_name.attr,
-	&uart_baud_rate.attr,
-	&uart_flow_cntrl.attr,
-	NULL,
-};
-
-static const struct attribute_group uim_attr_grp = {
-	.attrs = uim_attrs,
-};
-
-/*
- * st_kim_ref - reference the core's data
- *	This references the per-ST platform device in the arch/xx/
- *	board-xx.c file.
- *	This would enable multiple such platform devices to exist
- *	on a given platform
- */
-void st_kim_ref(struct st_data_s **core_data, int id)
-{
-	struct platform_device	*pdev;
-	struct kim_data_s	*kim_gdata;
-	/* get kim_gdata reference from platform device */
-	pdev = st_get_plat_device(id);
-	if (!pdev)
-		goto err;
-	kim_gdata = platform_get_drvdata(pdev);
-	if (!kim_gdata)
-		goto err;
-
-	*core_data = kim_gdata->core_data;
-	return;
-err:
-	*core_data = NULL;
-}
-
-DEFINE_SHOW_ATTRIBUTE(version);
-DEFINE_SHOW_ATTRIBUTE(list);
-
-/**********************************************************************/
-/* functions called from platform device driver subsystem
- * need to have a relevant platform device entry in the platform's
- * board-*.c file
- */
-
-static struct dentry *kim_debugfs_dir;
-static int kim_probe(struct platform_device *pdev)
-{
-	struct kim_data_s	*kim_gdata;
-	struct ti_st_plat_data	*pdata = pdev->dev.platform_data;
-	int err;
-
-	if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
-		/* multiple devices could exist */
-		st_kim_devices[pdev->id] = pdev;
-	} else {
-		/* platform's sure about existence of 1 device */
-		st_kim_devices[0] = pdev;
-	}
-
-	kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_KERNEL);
-	if (!kim_gdata) {
-		pr_err("no mem to allocate");
-		return -ENOMEM;
-	}
-	platform_set_drvdata(pdev, kim_gdata);
-
-	err = st_core_init(&kim_gdata->core_data);
-	if (err != 0) {
-		pr_err(" ST core init failed");
-		err = -EIO;
-		goto err_core_init;
-	}
-	/* refer to itself */
-	kim_gdata->core_data->kim_data = kim_gdata;
-
-	/* Claim the chip enable nShutdown gpio from the system */
-	kim_gdata->nshutdown = pdata->nshutdown_gpio;
-	err = gpio_request(kim_gdata->nshutdown, "kim");
-	if (unlikely(err)) {
-		pr_err(" gpio %d request failed ", kim_gdata->nshutdown);
-		goto err_sysfs_group;
-	}
-
-	/* Configure nShutdown GPIO as output=0 */
-	err = gpio_direction_output(kim_gdata->nshutdown, 0);
-	if (unlikely(err)) {
-		pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);
-		goto err_sysfs_group;
-	}
-	/* get reference of pdev for request_firmware */
-	kim_gdata->kim_pdev = pdev;
-	init_completion(&kim_gdata->kim_rcvd);
-	init_completion(&kim_gdata->ldisc_installed);
-
-	err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
-	if (err) {
-		pr_err("failed to create sysfs entries");
-		goto err_sysfs_group;
-	}
-
-	/* copying platform data */
-	strscpy(kim_gdata->dev_name, pdata->dev_name,
-		sizeof(kim_gdata->dev_name));
-	kim_gdata->flow_cntrl = pdata->flow_cntrl;
-	kim_gdata->baud_rate = pdata->baud_rate;
-	pr_info("sysfs entries created\n");
-
-	kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
-
-	debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
-				kim_gdata, &version_fops);
-	debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
-				kim_gdata, &list_fops);
-	return 0;
-
-err_sysfs_group:
-	st_core_exit(kim_gdata->core_data);
-
-err_core_init:
-	kfree(kim_gdata);
-
-	return err;
-}
-
-static void kim_remove(struct platform_device *pdev)
-{
-	/* free the GPIOs requested */
-	struct ti_st_plat_data	*pdata = pdev->dev.platform_data;
-	struct kim_data_s	*kim_gdata;
-
-	kim_gdata = platform_get_drvdata(pdev);
-
-	/*
-	 * Free the Bluetooth/FM/GPIO
-	 * nShutdown gpio from the system
-	 */
-	gpio_free(pdata->nshutdown_gpio);
-	pr_info("nshutdown GPIO Freed");
-
-	debugfs_remove_recursive(kim_debugfs_dir);
-	sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
-	pr_info("sysfs entries removed");
-
-	kim_gdata->kim_pdev = NULL;
-	st_core_exit(kim_gdata->core_data);
-
-	kfree(kim_gdata);
-	kim_gdata = NULL;
-}
-
-static int kim_suspend(struct platform_device *pdev, pm_message_t state)
-{
-	struct ti_st_plat_data	*pdata = pdev->dev.platform_data;
-
-	if (pdata->suspend)
-		return pdata->suspend(pdev, state);
-
-	return 0;
-}
-
-static int kim_resume(struct platform_device *pdev)
-{
-	struct ti_st_plat_data	*pdata = pdev->dev.platform_data;
-
-	if (pdata->resume)
-		return pdata->resume(pdev);
-
-	return 0;
-}
-
-/**********************************************************************/
-/* entry point for ST KIM module, called in from ST Core */
-static struct platform_driver kim_platform_driver = {
-	.probe = kim_probe,
-	.remove_new = kim_remove,
-	.suspend = kim_suspend,
-	.resume = kim_resume,
-	.driver = {
-		.name = "kim",
-	},
-};
-
-module_platform_driver(kim_platform_driver);
-
-MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
-MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
-MODULE_LICENSE("GPL");
diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c
deleted file mode 100644
index 07406140d277..000000000000
--- a/drivers/misc/ti-st/st_ll.c
+++ /dev/null
@@ -1,156 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Shared Transport driver
- *	HCI-LL module responsible for TI proprietary HCI_LL protocol
- *  Copyright (C) 2009-2010 Texas Instruments
- *  Author: Pavan Savoy <pavan_savoy@ti.com>
- */
-
-#define pr_fmt(fmt) "(stll) :" fmt
-#include <linux/skbuff.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/ti_wilink_st.h>
-
-/**********************************************************************/
-/* internal functions */
-static void send_ll_cmd(struct st_data_s *st_data,
-	unsigned char cmd)
-{
-
-	pr_debug("%s: writing %x", __func__, cmd);
-	st_int_write(st_data, &cmd, 1);
-	return;
-}
-
-static void ll_device_want_to_sleep(struct st_data_s *st_data)
-{
-	struct kim_data_s	*kim_data;
-	struct ti_st_plat_data	*pdata;
-
-	pr_debug("%s", __func__);
-	/* sanity check */
-	if (st_data->ll_state != ST_LL_AWAKE)
-		pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
-			  "in state %ld", st_data->ll_state);
-
-	send_ll_cmd(st_data, LL_SLEEP_ACK);
-	/* update state */
-	st_data->ll_state = ST_LL_ASLEEP;
-
-	/* communicate to platform about chip asleep */
-	kim_data = st_data->kim_data;
-	pdata = kim_data->kim_pdev->dev.platform_data;
-	if (pdata->chip_asleep)
-		pdata->chip_asleep(NULL);
-}
-
-static void ll_device_want_to_wakeup(struct st_data_s *st_data)
-{
-	struct kim_data_s	*kim_data;
-	struct ti_st_plat_data	*pdata;
-
-	/* diff actions in diff states */
-	switch (st_data->ll_state) {
-	case ST_LL_ASLEEP:
-		send_ll_cmd(st_data, LL_WAKE_UP_ACK);	/* send wake_ack */
-		break;
-	case ST_LL_ASLEEP_TO_AWAKE:
-		/* duplicate wake_ind */
-		pr_err("duplicate wake_ind while waiting for Wake ack");
-		break;
-	case ST_LL_AWAKE:
-		/* duplicate wake_ind */
-		pr_err("duplicate wake_ind already AWAKE");
-		break;
-	case ST_LL_AWAKE_TO_ASLEEP:
-		/* duplicate wake_ind */
-		pr_err("duplicate wake_ind");
-		break;
-	}
-	/* update state */
-	st_data->ll_state = ST_LL_AWAKE;
-
-	/* communicate to platform about chip wakeup */
-	kim_data = st_data->kim_data;
-	pdata = kim_data->kim_pdev->dev.platform_data;
-	if (pdata->chip_awake)
-		pdata->chip_awake(NULL);
-}
-
-/**********************************************************************/
-/* functions invoked by ST Core */
-
-/* called when ST Core wants to
- * enable ST LL */
-void st_ll_enable(struct st_data_s *ll)
-{
-	ll->ll_state = ST_LL_AWAKE;
-}
-
-/* called when ST Core /local module wants to
- * disable ST LL */
-void st_ll_disable(struct st_data_s *ll)
-{
-	ll->ll_state = ST_LL_INVALID;
-}
-
-/* called when ST Core wants to update the state */
-void st_ll_wakeup(struct st_data_s *ll)
-{
-	if (likely(ll->ll_state != ST_LL_AWAKE)) {
-		send_ll_cmd(ll, LL_WAKE_UP_IND);	/* WAKE_IND */
-		ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
-	} else {
-		/* don't send the duplicate wake_indication */
-		pr_err(" Chip already AWAKE ");
-	}
-}
-
-/* called when ST Core wants the state */
-unsigned long st_ll_getstate(struct st_data_s *ll)
-{
-	pr_debug(" returning state %ld", ll->ll_state);
-	return ll->ll_state;
-}
-
-/* called from ST Core, when a PM related packet arrives */
-unsigned long st_ll_sleep_state(struct st_data_s *st_data,
-	unsigned char cmd)
-{
-	switch (cmd) {
-	case LL_SLEEP_IND:	/* sleep ind */
-		pr_debug("sleep indication recvd");
-		ll_device_want_to_sleep(st_data);
-		break;
-	case LL_SLEEP_ACK:	/* sleep ack */
-		pr_err("sleep ack rcvd: host shouldn't");
-		break;
-	case LL_WAKE_UP_IND:	/* wake ind */
-		pr_debug("wake indication recvd");
-		ll_device_want_to_wakeup(st_data);
-		break;
-	case LL_WAKE_UP_ACK:	/* wake ack */
-		pr_debug("wake ack rcvd");
-		st_data->ll_state = ST_LL_AWAKE;
-		break;
-	default:
-		pr_err(" unknown input/state ");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/* Called from ST CORE to initialize ST LL */
-long st_ll_init(struct st_data_s *ll)
-{
-	/* set state to invalid */
-	ll->ll_state = ST_LL_INVALID;
-	return 0;
-}
-
-/* Called from ST CORE to de-initialize ST LL */
-long st_ll_deinit(struct st_data_s *ll)
-{
-	return 0;
-}