diff options
Diffstat (limited to 'drivers/misc/ti-st')
| -rw-r--r-- | drivers/misc/ti-st/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/misc/ti-st/Makefile | 7 | ||||
| -rw-r--r-- | drivers/misc/ti-st/st_core.c | 918 | ||||
| -rw-r--r-- | drivers/misc/ti-st/st_kim.c | 839 | ||||
| -rw-r--r-- | drivers/misc/ti-st/st_ll.c | 156 |
5 files changed, 1939 insertions, 0 deletions
diff --git a/drivers/misc/ti-st/Kconfig b/drivers/misc/ti-st/Kconfig new file mode 100644 index 0000000000..1503a6496f --- /dev/null +++ b/drivers/misc/ti-st/Kconfig @@ -0,0 +1,19 @@ +# 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 new file mode 100644 index 0000000000..9339310095 --- /dev/null +++ b/drivers/misc/ti-st/Makefile @@ -0,0 +1,7 @@ +# 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 new file mode 100644 index 0000000000..b878431553 --- /dev/null +++ b/drivers/misc/ti-st/st_core.c @@ -0,0 +1,918 @@ +// 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 new file mode 100644 index 0000000000..fe682e0553 --- /dev/null +++ b/drivers/misc/ti-st/st_kim.c @@ -0,0 +1,839 @@ +// 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 timeout; + + 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; + } + + timeout = wait_for_completion_interruptible_timeout( + &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME)); + if (timeout <= 0) { + pr_err(" waiting for ver info- timed out or received signal"); + return timeout ? -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 = (struct kim_data_s *)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 = (struct kim_data_s *)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); + strncpy(kim_data->dev_name, buf, count); + 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 */ + strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN); + 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 int 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; + return 0; +} + +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 = 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 new file mode 100644 index 0000000000..07406140d2 --- /dev/null +++ b/drivers/misc/ti-st/st_ll.c @@ -0,0 +1,156 @@ +// 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; +} |