Proxmox-Port/linux-loongson
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson synced 2025-08-30 13:03:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

misc: ti-st: st_kim: remove the driver

Browse Source 
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>
This commit is contained in:
Bartosz Golaszewski 2024-10-16 11:41:17 +02:00 committed by Greg Kroah-Hartman
parent c3c3a3e219
commit 78fe66360e
7 changed files with 0 additions and 1941 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/misc/Kconfig
View File

@ -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"

1
drivers/misc/Makefile
View File

@ -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/

19
drivers/misc/ti-st/Kconfig
View File

@ -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

7
drivers/misc/ti-st/Makefile
View File

@ -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

918
drivers/misc/ti-st/st_core.c
View File

@ -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);
}
}

839
drivers/misc/ti-st/st_kim.c
View File

@ -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");

156
drivers/misc/ti-st/st_ll.c
View File

@ -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;
}