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846 lines
23 KiB
846 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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/* |
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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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|
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/* |
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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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/* |
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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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/* |
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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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/* |
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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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/* |
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* Change ST LL state to continue to process next |
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* packet |
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*/ |
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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; |
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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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skb_put_data(kim_gdata->rx_skb, 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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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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static 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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/* |
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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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/* |
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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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/* |
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* ignore remote change |
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* baud rate HCI VS command |
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*/ |
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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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, |
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NULL, "install"); |
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/* wait for ldisc to be installed */ |
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err = wait_for_completion_interruptible_timeout( |
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&kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME)); |
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if (!err) { |
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/* |
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* ldisc installation timeout, |
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* flush uart, power cycle BT_EN |
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*/ |
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pr_err("ldisc installation timeout"); |
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err = st_kim_stop(kim_gdata); |
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continue; |
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} else { |
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/* ldisc installed now */ |
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pr_info("line discipline installed"); |
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err = download_firmware(kim_gdata); |
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if (err != 0) { |
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/* |
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* ldisc installed but fw download failed, |
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* flush uart & power cycle BT_EN |
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*/ |
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pr_err("download firmware failed"); |
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err = st_kim_stop(kim_gdata); |
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continue; |
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} else { /* on success don't retry */ |
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break; |
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} |
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} |
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} while (retry--); |
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return err; |
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} |
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|
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/* |
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* st_kim_stop - stop communication with chip. |
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* This can be called from ST Core/KIM, on the- |
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* (a) last un-register when chip need not be powered there-after, |
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* (b) upon failure to either install ldisc or download firmware. |
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* The function is responsible to (a) notify UIM about un-installation, |
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* (b) flush UART if the ldisc was installed. |
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* (c) reset BT_EN - pull down nshutdown at the end. |
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* (d) invoke platform's chip disabling routine. |
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*/ |
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long st_kim_stop(void *kim_data) |
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{ |
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long err = 0; |
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struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data; |
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struct ti_st_plat_data *pdata = |
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kim_gdata->kim_pdev->dev.platform_data; |
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struct tty_struct *tty = kim_gdata->core_data->tty; |
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|
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reinit_completion(&kim_gdata->ldisc_installed); |
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|
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if (tty) { /* can be called before ldisc is installed */ |
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/* Flush any pending characters in the driver and discipline. */ |
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tty_ldisc_flush(tty); |
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tty_driver_flush_buffer(tty); |
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} |
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|
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/* send uninstall notification to UIM */ |
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pr_info("ldisc_install = 0"); |
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kim_gdata->ldisc_install = 0; |
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sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install"); |
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|
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/* wait for ldisc to be un-installed */ |
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err = wait_for_completion_interruptible_timeout( |
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&kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME)); |
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if (!err) { /* timeout */ |
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pr_err(" timed out waiting for ldisc to be un-installed"); |
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err = -ETIMEDOUT; |
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} |
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|
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/* By default configure BT nShutdown to LOW state */ |
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gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW); |
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mdelay(1); |
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gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH); |
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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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips "); |
|
MODULE_LICENSE("GPL");
|
|
|