![Daniel Wagner](/assets/img/avatar_default.png)
complete_all() should only be called once, doing it twice is a clear bug.
8565adbc82
("drivers/misc/ti-st: fix read fw version cmd") added the
additional complete_all() call. Since we call complete_all() when
leaving the function we can drop the complete_all() call inside
true branch of the if statement.
Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Cc: Pavan Savoy <pavan_savoy@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
870 lines
24 KiB
C
870 lines
24 KiB
C
/*
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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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*
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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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*
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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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*
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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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*
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*/
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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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/**
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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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*/
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static struct platform_device *st_get_plat_device(int id)
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{
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return st_kim_devices[id];
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}
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/**
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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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* response times out
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*/
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static void validate_firmware_response(struct kim_data_s *kim_gdata)
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{
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struct sk_buff *skb = kim_gdata->rx_skb;
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if (!skb)
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return;
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/* these magic numbers are the position in the response buffer which
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* allows us to distinguish whether the response is for the read
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* version info. command
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*/
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if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
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skb->data[4] == 0x10 && skb->data[5] == 0x00) {
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/* fw version response */
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memcpy(kim_gdata->resp_buffer,
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kim_gdata->rx_skb->data,
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kim_gdata->rx_skb->len);
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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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} else if (unlikely(skb->data[5] != 0)) {
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pr_err("no proper response during fw download");
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pr_err("data6 %x", skb->data[5]);
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kfree_skb(skb);
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return; /* keep waiting for the proper response */
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}
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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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kfree_skb(skb);
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}
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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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*/
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static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
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{
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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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if (!len) {
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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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*/
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pr_err("Data length is too large len %d room %d", len,
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room);
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kfree_skb(kim_gdata->rx_skb);
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} else {
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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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* payload data */
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kim_gdata->rx_state = ST_W4_DATA;
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kim_gdata->rx_count = len;
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return len;
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}
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/* Change ST LL state to continue to process next
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* packet */
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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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return 0;
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}
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/**
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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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*/
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static void kim_int_recv(struct kim_data_s *kim_gdata,
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const unsigned char *data, long count)
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{
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const unsigned char *ptr;
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int len = 0, type = 0;
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unsigned char *plen;
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pr_debug("%s", __func__);
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/* Decode received bytes here */
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ptr = data;
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if (unlikely(ptr == NULL)) {
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pr_err(" received null from TTY ");
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return;
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}
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while (count) {
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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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count -= len;
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ptr += len;
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if (kim_gdata->rx_count)
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continue;
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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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case ST_W4_DATA:
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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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continue;
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/* Waiting for Bluetooth event header ? */
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case ST_W4_HEADER:
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plen =
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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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continue;
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} /* end of switch */
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} /* end of if rx_state */
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switch (*ptr) {
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/* Bluetooth event packet? */
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case 0x04:
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kim_gdata->rx_state = ST_W4_HEADER;
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kim_gdata->rx_count = 2;
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type = *ptr;
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break;
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default:
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pr_info("unknown packet");
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ptr++;
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count--;
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continue;
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}
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ptr++;
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count--;
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kim_gdata->rx_skb =
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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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return;
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}
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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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}
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return;
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}
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static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
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{
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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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long timeout;
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pr_debug("%s", __func__);
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reinit_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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return -EIO;
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}
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timeout = wait_for_completion_interruptible_timeout(
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&kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
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if (timeout <= 0) {
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pr_err(" waiting for ver info- timed out or received signal");
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return timeout ? -ERESTARTSYS : -ETIMEDOUT;
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}
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reinit_completion(&kim_gdata->kim_rcvd);
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/* the positions 12 & 13 in the response buffer provide with the
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* chip, major & minor numbers
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*/
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version =
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MAKEWORD(kim_gdata->resp_buffer[12],
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kim_gdata->resp_buffer[13]);
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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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maj_ver |= 0x0008;
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sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
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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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return 0;
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}
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static void skip_change_remote_baud(unsigned char **ptr, long *len)
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{
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unsigned char *nxt_action, *cur_action;
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cur_action = *ptr;
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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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} else {
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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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}
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}
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/**
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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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*/
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static long download_firmware(struct kim_data_s *kim_gdata)
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{
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long err = 0;
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long len = 0;
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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[40] = { 0 }; /* 40 char long bts scr name? */
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int wr_room_space;
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int cmd_size;
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unsigned long timeout;
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err = read_local_version(kim_gdata, bts_scr_name);
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if (err != 0) {
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pr_err("kim: failed to read local ver");
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return err;
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}
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err =
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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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bts_scr_name);
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return -EINVAL;
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}
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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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* version
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*/
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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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pr_debug("S");
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action_ptr = &(((struct bts_action *)ptr)->data[0]);
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if (unlikely
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(((struct hci_command *)action_ptr)->opcode ==
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0xFF36)) {
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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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break;
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}
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/*
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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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*/
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cmd_size = ((struct bts_action *)ptr)->size;
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timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
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do {
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wr_room_space =
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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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}
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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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return -ETIMEDOUT;
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}
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/* reinit completion before sending for the
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* relevant wait
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*/
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reinit_completion(&kim_gdata->kim_rcvd);
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/*
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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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* buffer.
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*/
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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);
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if (unlikely(err < 0)) {
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release_firmware(kim_gdata->fw_entry);
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return err;
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}
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/*
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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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*/
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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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return -EIO;
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}
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break;
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case ACTION_WAIT_EVENT: /* wait */
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pr_debug("W");
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err = wait_for_completion_interruptible_timeout(
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&kim_gdata->kim_rcvd,
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msecs_to_jiffies(CMD_RESP_TIME));
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if (err <= 0) {
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pr_err("response timeout/signaled during fw download ");
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/* timed out */
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release_firmware(kim_gdata->fw_entry);
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return err ? -ERESTARTSYS : -ETIMEDOUT;
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}
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reinit_completion(&kim_gdata->kim_rcvd);
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break;
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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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break;
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}
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len =
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len - (sizeof(struct bts_action) +
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((struct bts_action *)ptr)->size);
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ptr =
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ptr + sizeof(struct bts_action) +
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((struct bts_action *)ptr)->size;
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}
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/* fw download complete */
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release_firmware(kim_gdata->fw_entry);
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return 0;
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}
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/**********************************************************************/
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/* functions called from ST core */
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/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
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* can be because of
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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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*/
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void st_kim_recv(void *disc_data, const unsigned char *data, long count)
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{
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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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/* proceed to gather all data and distinguish read fw version response
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* from other fw responses when data gathering is complete
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*/
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kim_int_recv(kim_gdata, data, count);
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return;
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}
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/* to signal completion of line discipline installation
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* called from ST Core, upon tty_open
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*/
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void st_kim_complete(void *kim_data)
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{
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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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}
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/**
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* st_kim_start - called from ST Core upon 1st registration
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* 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).
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*/
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long st_kim_start(void *kim_data)
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{
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long err = 0;
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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;
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do {
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/* platform specific enabling code here */
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if (pdata->chip_enable)
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pdata->chip_enable(kim_gdata);
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/* Configure BT nShutdown to HIGH state */
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gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
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mdelay(5); /* FIXME: a proper toggle */
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gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
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mdelay(100);
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/* re-initialize the completion */
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reinit_completion(&kim_gdata->ldisc_installed);
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/* send notification to UIM */
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kim_gdata->ldisc_install = 1;
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pr_info("ldisc_install = 1");
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|
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 show_version(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 show_list(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 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;
|
|
}
|
|
|
|
static int kim_version_open(struct inode *i, struct file *f)
|
|
{
|
|
return single_open(f, show_version, i->i_private);
|
|
}
|
|
|
|
static int kim_list_open(struct inode *i, struct file *f)
|
|
{
|
|
return single_open(f, show_list, i->i_private);
|
|
}
|
|
|
|
static const struct file_operations version_debugfs_fops = {
|
|
/* version info */
|
|
.open = kim_version_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
static const struct file_operations list_debugfs_fops = {
|
|
/* protocols info */
|
|
.open = kim_list_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
/**********************************************************************/
|
|
/* 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_ATOMIC);
|
|
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);
|
|
return err;
|
|
}
|
|
|
|
/* 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);
|
|
return err;
|
|
}
|
|
/* 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);
|
|
if (!kim_debugfs_dir) {
|
|
pr_err(" debugfs entries creation failed ");
|
|
return 0;
|
|
}
|
|
|
|
debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
|
|
kim_gdata, &version_debugfs_fops);
|
|
debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
|
|
kim_gdata, &list_debugfs_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");
|