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* Shared Transport Line discipline driver Core
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* Init Manager module responsible for GPIO control
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* and firmware download
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* Copyright (C) 2009-2010 Texas Instruments
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* Author: Pavan Savoy <pavan_savoy@ti.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#define pr_fmt(fmt) "(stk) :" fmt
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#include <linux/platform_device.h>
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#include <linux/jiffies.h>
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#include <linux/firmware.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/gpio.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/sched.h>
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#include <linux/sysfs.h>
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#include <linux/tty.h>
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#include <linux/skbuff.h>
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#include <linux/ti_wilink_st.h>
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#include <linux/module.h>
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#define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */
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static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
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/**********************************************************************/
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/* internal functions */
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* st_get_plat_device -
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* function which returns the reference to the platform device
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* requested by id. As of now only 1 such device exists (id=0)
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* the context requesting for reference can get the id to be
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* requested by a. The protocol driver which is registering or
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* b. the tty device which is opened.
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static struct platform_device *st_get_plat_device(int id)
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return st_kim_devices[id];
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* validate_firmware_response -
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* function to return whether the firmware response was proper
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* in case of error don't complete so that waiting for proper
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void validate_firmware_response(struct kim_data_s *kim_gdata)
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struct sk_buff *skb = kim_gdata->rx_skb;
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if (unlikely(skb->data[5] != 0)) {
70
pr_err("no proper response during fw download");
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pr_err("data6 %x", skb->data[5]);
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return; /* keep waiting for the proper response */
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/* becos of all the script being downloaded */
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complete_all(&kim_gdata->kim_rcvd);
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/* check for data len received inside kim_int_recv
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* most often hit the last case to update state to waiting for data
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static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
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register int room = skb_tailroom(kim_gdata->rx_skb);
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pr_debug("len %d room %d", len, room);
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validate_firmware_response(kim_gdata);
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} else if (len > room) {
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/* Received packet's payload length is larger.
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* We can't accommodate it in created skb.
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pr_err("Data length is too large len %d room %d", len,
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kfree_skb(kim_gdata->rx_skb);
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/* Packet header has non-zero payload length and
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* we have enough space in created skb. Lets read
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kim_gdata->rx_state = ST_W4_DATA;
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kim_gdata->rx_count = len;
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/* Change ST LL state to continue to process next
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kim_gdata->rx_state = ST_W4_PACKET_TYPE;
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kim_gdata->rx_skb = NULL;
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kim_gdata->rx_count = 0;
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* kim_int_recv - receive function called during firmware download
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* firmware download responses on different UART drivers
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* have been observed to come in bursts of different
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* tty_receive and hence the logic
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void kim_int_recv(struct kim_data_s *kim_gdata,
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const unsigned char *data, long count)
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const unsigned char *ptr;
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int len = 0, type = 0;
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pr_debug("%s", __func__);
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/* Decode received bytes here */
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if (unlikely(ptr == NULL)) {
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pr_err(" received null from TTY ");
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if (kim_gdata->rx_count) {
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len = min_t(unsigned int, kim_gdata->rx_count, count);
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memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
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kim_gdata->rx_count -= len;
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if (kim_gdata->rx_count)
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/* Check ST RX state machine , where are we? */
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switch (kim_gdata->rx_state) {
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/* Waiting for complete packet ? */
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pr_debug("Complete pkt received");
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validate_firmware_response(kim_gdata);
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kim_gdata->rx_state = ST_W4_PACKET_TYPE;
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kim_gdata->rx_skb = NULL;
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/* Waiting for Bluetooth event header ? */
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(unsigned char *)&kim_gdata->rx_skb->data[1];
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pr_debug("event hdr: plen 0x%02x\n", *plen);
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kim_check_data_len(kim_gdata, *plen);
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} /* end of switch */
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} /* end of if rx_state */
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/* Bluetooth event packet? */
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kim_gdata->rx_state = ST_W4_HEADER;
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kim_gdata->rx_count = 2;
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pr_info("unknown packet");
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alloc_skb(1024+8, GFP_ATOMIC);
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if (!kim_gdata->rx_skb) {
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pr_err("can't allocate mem for new packet");
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kim_gdata->rx_state = ST_W4_PACKET_TYPE;
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kim_gdata->rx_count = 0;
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skb_reserve(kim_gdata->rx_skb, 8);
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kim_gdata->rx_skb->cb[0] = 4;
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kim_gdata->rx_skb->cb[1] = 0;
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static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
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unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
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const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
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pr_debug("%s", __func__);
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INIT_COMPLETION(kim_gdata->kim_rcvd);
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if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
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pr_err("kim: couldn't write 4 bytes");
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if (!wait_for_completion_timeout
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(&kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME))) {
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pr_err(" waiting for ver info- timed out ");
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INIT_COMPLETION(kim_gdata->kim_rcvd);
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MAKEWORD(kim_gdata->resp_buffer[13],
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kim_gdata->resp_buffer[14]);
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chip = (version & 0x7C00) >> 10;
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min_ver = (version & 0x007F);
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maj_ver = (version & 0x0380) >> 7;
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if (version & 0x8000)
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sprintf(bts_scr_name, "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver);
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/* to be accessed later via sysfs entry */
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kim_gdata->version.full = version;
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kim_gdata->version.chip = chip;
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kim_gdata->version.maj_ver = maj_ver;
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kim_gdata->version.min_ver = min_ver;
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pr_info("%s", bts_scr_name);
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void skip_change_remote_baud(unsigned char **ptr, long *len)
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unsigned char *nxt_action, *cur_action;
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nxt_action = cur_action + sizeof(struct bts_action) +
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((struct bts_action *) cur_action)->size;
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if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
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pr_err("invalid action after change remote baud command");
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*ptr = *ptr + sizeof(struct bts_action) +
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((struct bts_action *)cur_action)->size;
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*len = *len - (sizeof(struct bts_action) +
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((struct bts_action *)cur_action)->size);
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/* warn user on not commenting these in firmware */
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pr_warn("skipping the wait event of change remote baud");
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* download_firmware -
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* internal function which parses through the .bts firmware
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* script file intreprets SEND, DELAY actions only as of now
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static long download_firmware(struct kim_data_s *kim_gdata)
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unsigned char *ptr = NULL;
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unsigned char *action_ptr = NULL;
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unsigned char bts_scr_name[30] = { 0 }; /* 30 char long bts scr name? */
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unsigned long timeout;
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err = read_local_version(kim_gdata, bts_scr_name);
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pr_err("kim: failed to read local ver");
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request_firmware(&kim_gdata->fw_entry, bts_scr_name,
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&kim_gdata->kim_pdev->dev);
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if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
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(kim_gdata->fw_entry->size == 0))) {
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pr_err(" request_firmware failed(errno %ld) for %s", err,
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ptr = (void *)kim_gdata->fw_entry->data;
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len = kim_gdata->fw_entry->size;
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/* bts_header to remove out magic number and
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ptr += sizeof(struct bts_header);
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len -= sizeof(struct bts_header);
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while (len > 0 && ptr) {
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pr_debug(" action size %d, type %d ",
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((struct bts_action *)ptr)->size,
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((struct bts_action *)ptr)->type);
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switch (((struct bts_action *)ptr)->type) {
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case ACTION_SEND_COMMAND: /* action send */
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action_ptr = &(((struct bts_action *)ptr)->data[0]);
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(((struct hci_command *)action_ptr)->opcode ==
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/* ignore remote change
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* baud rate HCI VS command */
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pr_warn("change remote baud"
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" rate command in firmware");
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skip_change_remote_baud(&ptr, &len);
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* Make sure we have enough free space in uart
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* tx buffer to write current firmware command
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cmd_size = ((struct bts_action *)ptr)->size;
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timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
324
st_get_uart_wr_room(kim_gdata->core_data);
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if (wr_room_space < 0) {
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pr_err("Unable to get free "
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"space info from uart tx buffer");
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release_firmware(kim_gdata->fw_entry);
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return wr_room_space;
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mdelay(1); /* wait 1ms before checking room */
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} while ((wr_room_space < cmd_size) &&
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time_before(jiffies, timeout));
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/* Timeout happened ? */
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if (time_after_eq(jiffies, timeout)) {
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pr_err("Timeout while waiting for free "
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"free space in uart tx buffer");
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release_firmware(kim_gdata->fw_entry);
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/* reinit completion before sending for the
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INIT_COMPLETION(kim_gdata->kim_rcvd);
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* Free space found in uart buffer, call st_int_write
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* to send current firmware command to the uart tx
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err = st_int_write(kim_gdata->core_data,
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((struct bts_action_send *)action_ptr)->data,
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((struct bts_action *)ptr)->size);
355
if (unlikely(err < 0)) {
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release_firmware(kim_gdata->fw_entry);
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* Check number of bytes written to the uart tx buffer
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* and requested command write size
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if (err != cmd_size) {
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pr_err("Number of bytes written to uart "
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"tx buffer are not matching with "
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"requested cmd write size");
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release_firmware(kim_gdata->fw_entry);
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case ACTION_WAIT_EVENT: /* wait */
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if (!wait_for_completion_timeout
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(&kim_gdata->kim_rcvd,
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msecs_to_jiffies(CMD_RESP_TIME))) {
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pr_err("response timeout during fw download ");
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release_firmware(kim_gdata->fw_entry);
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INIT_COMPLETION(kim_gdata->kim_rcvd);
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case ACTION_DELAY: /* sleep */
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pr_info("sleep command in scr");
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action_ptr = &(((struct bts_action *)ptr)->data[0]);
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mdelay(((struct bts_action_delay *)action_ptr)->msec);
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len - (sizeof(struct bts_action) +
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((struct bts_action *)ptr)->size);
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ptr + sizeof(struct bts_action) +
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((struct bts_action *)ptr)->size;
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/* fw download complete */
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release_firmware(kim_gdata->fw_entry);
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/**********************************************************************/
402
/* functions called from ST core */
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/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
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* 1. response to read local version
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* 2. during send/recv's of firmware download
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void st_kim_recv(void *disc_data, const unsigned char *data, long count)
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struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
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struct kim_data_s *kim_gdata = st_gdata->kim_data;
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/* copy to local buffer */
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if (unlikely(data[4] == 0x01 && data[5] == 0x10 && data[0] == 0x04)) {
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/* must be the read_ver_cmd */
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memcpy(kim_gdata->resp_buffer, data, count);
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complete_all(&kim_gdata->kim_rcvd);
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kim_int_recv(kim_gdata, data, count);
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/* either completes or times out */
426
/* to signal completion of line discipline installation
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* called from ST Core, upon tty_open
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void st_kim_complete(void *kim_data)
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struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
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complete(&kim_gdata->ldisc_installed);
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* st_kim_start - called from ST Core upon 1st registration
437
* This involves toggling the chip enable gpio, reading
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* the firmware version from chip, forming the fw file name
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* based on the chip version, requesting the fw, parsing it
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* and perform download(send/recv).
442
long st_kim_start(void *kim_data)
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long retry = POR_RETRY_COUNT;
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struct ti_st_plat_data *pdata;
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struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
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pr_info(" %s", __func__);
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pdata = kim_gdata->kim_pdev->dev.platform_data;
453
/* platform specific enabling code here */
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if (pdata->chip_enable)
455
pdata->chip_enable(kim_gdata);
457
/* Configure BT nShutdown to HIGH state */
458
gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
459
mdelay(5); /* FIXME: a proper toggle */
460
gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
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/* re-initialize the completion */
463
INIT_COMPLETION(kim_gdata->ldisc_installed);
464
/* send notification to UIM */
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kim_gdata->ldisc_install = 1;
466
pr_info("ldisc_install = 1");
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sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
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/* wait for ldisc to be installed */
470
err = wait_for_completion_timeout(&kim_gdata->ldisc_installed,
471
msecs_to_jiffies(LDISC_TIME));
472
if (!err) { /* timeout */
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pr_err("line disc installation timed out ");
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kim_gdata->ldisc_install = 0;
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pr_info("ldisc_install = 0");
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sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
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/* the following wait is never going to be completed,
479
* since the ldisc was never installed, hence serving
480
* as a mdelay of LDISC_TIME msecs */
481
err = wait_for_completion_timeout
482
(&kim_gdata->ldisc_installed,
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msecs_to_jiffies(LDISC_TIME));
487
/* ldisc installed now */
488
pr_info(" line discipline installed ");
489
err = download_firmware(kim_gdata);
491
pr_err("download firmware failed");
492
kim_gdata->ldisc_install = 0;
493
pr_info("ldisc_install = 0");
494
sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
496
/* this wait might be completed, though in the
497
* tty_close() since the ldisc is already
499
err = wait_for_completion_timeout
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(&kim_gdata->ldisc_installed,
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msecs_to_jiffies(LDISC_TIME));
504
} else { /* on success don't retry */
513
* st_kim_stop - called from ST Core, on the last un-registration
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* toggle low the chip enable gpio
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long st_kim_stop(void *kim_data)
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struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
520
struct ti_st_plat_data *pdata =
521
kim_gdata->kim_pdev->dev.platform_data;
523
INIT_COMPLETION(kim_gdata->ldisc_installed);
525
/* Flush any pending characters in the driver and discipline. */
526
tty_ldisc_flush(kim_gdata->core_data->tty);
527
tty_driver_flush_buffer(kim_gdata->core_data->tty);
529
/* send uninstall notification to UIM */
530
pr_info("ldisc_install = 0");
531
kim_gdata->ldisc_install = 0;
532
sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
534
/* wait for ldisc to be un-installed */
535
err = wait_for_completion_timeout(&kim_gdata->ldisc_installed,
536
msecs_to_jiffies(LDISC_TIME));
537
if (!err) { /* timeout */
538
pr_err(" timed out waiting for ldisc to be un-installed");
542
/* By default configure BT nShutdown to LOW state */
543
gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
545
gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
547
gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
549
/* platform specific disable */
550
if (pdata->chip_disable)
551
pdata->chip_disable(kim_gdata);
555
/**********************************************************************/
556
/* functions called from subsystems */
557
/* called when debugfs entry is read from */
559
static int show_version(struct seq_file *s, void *unused)
561
struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
562
seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
563
kim_gdata->version.chip, kim_gdata->version.maj_ver,
564
kim_gdata->version.min_ver);
568
static int show_list(struct seq_file *s, void *unused)
570
struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
571
kim_st_list_protocols(kim_gdata->core_data, s);
575
static ssize_t show_install(struct device *dev,
576
struct device_attribute *attr, char *buf)
578
struct kim_data_s *kim_data = dev_get_drvdata(dev);
579
return sprintf(buf, "%d\n", kim_data->ldisc_install);
582
static ssize_t show_dev_name(struct device *dev,
583
struct device_attribute *attr, char *buf)
585
struct kim_data_s *kim_data = dev_get_drvdata(dev);
586
return sprintf(buf, "%s\n", kim_data->dev_name);
589
static ssize_t show_baud_rate(struct device *dev,
590
struct device_attribute *attr, char *buf)
592
struct kim_data_s *kim_data = dev_get_drvdata(dev);
593
return sprintf(buf, "%ld\n", kim_data->baud_rate);
596
static ssize_t show_flow_cntrl(struct device *dev,
597
struct device_attribute *attr, char *buf)
599
struct kim_data_s *kim_data = dev_get_drvdata(dev);
600
return sprintf(buf, "%d\n", kim_data->flow_cntrl);
603
/* structures specific for sysfs entries */
604
static struct kobj_attribute ldisc_install =
605
__ATTR(install, 0444, (void *)show_install, NULL);
607
static struct kobj_attribute uart_dev_name =
608
__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
610
static struct kobj_attribute uart_baud_rate =
611
__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
613
static struct kobj_attribute uart_flow_cntrl =
614
__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
616
static struct attribute *uim_attrs[] = {
619
&uart_baud_rate.attr,
620
&uart_flow_cntrl.attr,
624
static struct attribute_group uim_attr_grp = {
629
* st_kim_ref - reference the core's data
630
* This references the per-ST platform device in the arch/xx/
632
* This would enable multiple such platform devices to exist
633
* on a given platform
635
void st_kim_ref(struct st_data_s **core_data, int id)
637
struct platform_device *pdev;
638
struct kim_data_s *kim_gdata;
639
/* get kim_gdata reference from platform device */
640
pdev = st_get_plat_device(id);
645
kim_gdata = dev_get_drvdata(&pdev->dev);
646
*core_data = kim_gdata->core_data;
649
static int kim_version_open(struct inode *i, struct file *f)
651
return single_open(f, show_version, i->i_private);
654
static int kim_list_open(struct inode *i, struct file *f)
656
return single_open(f, show_list, i->i_private);
659
static const struct file_operations version_debugfs_fops = {
661
.open = kim_version_open,
664
.release = single_release,
666
static const struct file_operations list_debugfs_fops = {
668
.open = kim_list_open,
671
.release = single_release,
674
/**********************************************************************/
675
/* functions called from platform device driver subsystem
676
* need to have a relevant platform device entry in the platform's
680
struct dentry *kim_debugfs_dir;
681
static int kim_probe(struct platform_device *pdev)
684
struct kim_data_s *kim_gdata;
685
struct ti_st_plat_data *pdata = pdev->dev.platform_data;
687
if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
688
/* multiple devices could exist */
689
st_kim_devices[pdev->id] = pdev;
691
/* platform's sure about existence of 1 device */
692
st_kim_devices[0] = pdev;
695
kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
697
pr_err("no mem to allocate");
700
dev_set_drvdata(&pdev->dev, kim_gdata);
702
status = st_core_init(&kim_gdata->core_data);
704
pr_err(" ST core init failed");
707
/* refer to itself */
708
kim_gdata->core_data->kim_data = kim_gdata;
710
/* Claim the chip enable nShutdown gpio from the system */
711
kim_gdata->nshutdown = pdata->nshutdown_gpio;
712
status = gpio_request(kim_gdata->nshutdown, "kim");
713
if (unlikely(status)) {
714
pr_err(" gpio %ld request failed ", kim_gdata->nshutdown);
718
/* Configure nShutdown GPIO as output=0 */
719
status = gpio_direction_output(kim_gdata->nshutdown, 0);
720
if (unlikely(status)) {
721
pr_err(" unable to configure gpio %ld", kim_gdata->nshutdown);
724
/* get reference of pdev for request_firmware
726
kim_gdata->kim_pdev = pdev;
727
init_completion(&kim_gdata->kim_rcvd);
728
init_completion(&kim_gdata->ldisc_installed);
730
status = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
732
pr_err("failed to create sysfs entries");
736
/* copying platform data */
737
strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
738
kim_gdata->flow_cntrl = pdata->flow_cntrl;
739
kim_gdata->baud_rate = pdata->baud_rate;
740
pr_info("sysfs entries created\n");
742
kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
743
if (IS_ERR(kim_debugfs_dir)) {
744
pr_err(" debugfs entries creation failed ");
745
kim_debugfs_dir = NULL;
749
debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
750
kim_gdata, &version_debugfs_fops);
751
debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
752
kim_gdata, &list_debugfs_fops);
753
pr_info(" debugfs entries created ");
757
static int kim_remove(struct platform_device *pdev)
759
/* free the GPIOs requested */
760
struct ti_st_plat_data *pdata = pdev->dev.platform_data;
761
struct kim_data_s *kim_gdata;
763
kim_gdata = dev_get_drvdata(&pdev->dev);
765
/* Free the Bluetooth/FM/GPIO
766
* nShutdown gpio from the system
768
gpio_free(pdata->nshutdown_gpio);
769
pr_info("nshutdown GPIO Freed");
771
debugfs_remove_recursive(kim_debugfs_dir);
772
sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
773
pr_info("sysfs entries removed");
775
kim_gdata->kim_pdev = NULL;
776
st_core_exit(kim_gdata->core_data);
783
int kim_suspend(struct platform_device *pdev, pm_message_t state)
785
struct ti_st_plat_data *pdata = pdev->dev.platform_data;
788
return pdata->suspend(pdev, state);
793
int kim_resume(struct platform_device *pdev)
795
struct ti_st_plat_data *pdata = pdev->dev.platform_data;
798
return pdata->resume(pdev);
803
/**********************************************************************/
804
/* entry point for ST KIM module, called in from ST Core */
805
static struct platform_driver kim_platform_driver = {
807
.remove = kim_remove,
808
.suspend = kim_suspend,
809
.resume = kim_resume,
812
.owner = THIS_MODULE,
816
static int __init st_kim_init(void)
818
return platform_driver_register(&kim_platform_driver);
821
static void __exit st_kim_deinit(void)
823
platform_driver_unregister(&kim_platform_driver);
827
module_init(st_kim_init);
828
module_exit(st_kim_deinit);
829
MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
830
MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
831
MODULE_LICENSE("GPL");