drivers/char/diag/diagfwd.c

/* Copyright (c) 2008-2012, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/diagchar.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/of.h>
#ifdef CONFIG_DIAG_OVER_USB
#include <mach/usbdiag.h>
#endif
#include <mach/msm_smd.h>
#include <mach/socinfo.h>
#include <mach/restart.h>
#include "diagmem.h"
#include "diagchar.h"
#include "diagfwd.h"
#include "diagfwd_cntl.h"
#include "diagchar_hdlc.h"
#ifdef CONFIG_DIAG_SDIO_PIPE
#include "diagfwd_sdio.h"
#endif
#define MODE_CMD	41
#define RESET_ID	2

int diag_debug_buf_idx;
unsigned char diag_debug_buf[1024];
static unsigned int buf_tbl_size = 8; /*Number of entries in table of buffers */
struct diag_master_table entry;
smd_channel_t *ch_temp, *chqdsp_temp, *ch_wcnss_temp;
int diag_event_num_bytes;
int diag_event_config;
struct diag_send_desc_type send = { NULL, NULL, DIAG_STATE_START, 0 };
struct diag_hdlc_dest_type enc = { NULL, NULL, 0 };
struct mask_info {
	int equip_id;
	int num_items;
	int index;
};

#define ENCODE_RSP_AND_SEND(buf_length)				\
do {									\
	send.state = DIAG_STATE_START;					\
	send.pkt = driver->apps_rsp_buf;				\
	send.last = (void *)(driver->apps_rsp_buf + buf_length);	\
	send.terminate = 1;						\
	if (!driver->in_busy_1) {					\
		enc.dest = driver->buf_in_1;				\
		enc.dest_last = (void *)(driver->buf_in_1 + APPS_BUF_SIZE - 1);\
		diag_hdlc_encode(&send, &enc);				\
		driver->write_ptr_1->buf = driver->buf_in_1;		\
		driver->write_ptr_1->length = (int)(enc.dest - \
						(void *)(driver->buf_in_1)); \
		driver->in_busy_1 = 1;					\
		diag_device_write(driver->buf_in_1, MODEM_DATA, \
						 driver->write_ptr_1); \
		memset(driver->apps_rsp_buf, '\0', APPS_BUF_SIZE);	\
	}								\
} while (0)

#define CHK_OVERFLOW(bufStart, start, end, length) \
((bufStart <= start) && (end - start >= length)) ? 1 : 0

/* Determine if this device uses a device tree */
#ifdef CONFIG_OF
static int has_device_tree(void)
{
	struct device_node *node;

	node = of_find_node_by_path("/");
	if (node) {
		of_node_put(node);
		return 1;
	}
	return 0;
}
#else
static int has_device_tree(void)
{
	return 0;
}
#endif

int chk_config_get_id(void)
{
	/* For all Fusion targets, Modem will always be present */
	if (machine_is_msm8x60_fusion() || machine_is_msm8x60_fusn_ffa())
		return 0;

	if (driver->use_device_tree) {
		if (machine_is_copper())
			return MSM8974_TOOLS_ID;
		else
			return 0;
	} else {
		switch (socinfo_get_msm_cpu()) {
		case MSM_CPU_8X60:
			return APQ8060_TOOLS_ID;
		case MSM_CPU_8960:
			return AO8960_TOOLS_ID;
		case MSM_CPU_8064:
			return APQ8064_TOOLS_ID;
		case MSM_CPU_8930:
			return MSM8930_TOOLS_ID;
		case MSM_CPU_COPPER:
			return MSM8974_TOOLS_ID;
		case MSM_CPU_8625:
			return MSM8625_TOOLS_ID;
		default:
			return 0;
		}
	}
}

/*
 * This will return TRUE for targets which support apps only mode and hence SSR.
 * This applies to 8960 and newer targets.
 */
int chk_apps_only(void)
{
	if (driver->use_device_tree)
		return 1;

	switch (socinfo_get_msm_cpu()) {
	case MSM_CPU_8960:
	case MSM_CPU_8064:
	case MSM_CPU_8930:
	case MSM_CPU_8627:
	case MSM_CPU_9615:
	case MSM_CPU_COPPER:
		return 1;
	default:
		return 0;
	}
}

/*
 * This will return TRUE for targets which support apps as master.
 * Thus, SW DLOAD and Mode Reset are supported on apps processor.
 * This applies to 8960 and newer targets.
 */
int chk_apps_master(void)
{
	if (driver->use_device_tree)
		return 1;
	else if (cpu_is_msm8960() || cpu_is_msm8930() || cpu_is_msm9615() ||
		cpu_is_apq8064() || cpu_is_msm8627())
		return 1;
	else
		return 0;
}

inline int chk_polling_response(void)
{
	if (!(driver->polling_reg_flag) && chk_apps_master())
		/*
		 * If the apps processor is master and no other processor
		 * has registered to respond for polling
		 */
		return 1;
	else if (!(driver->ch) && !(chk_apps_master()))
		/*
		 * If the apps processor is not the master and the modem
		 * is not up
		 */
		return 1;
	else
		return 0;
}

void __diag_smd_send_req(void)
{
	void *buf = NULL;
	int *in_busy_ptr = NULL;
	struct diag_request *write_ptr_modem = NULL;

	if (!driver->in_busy_1) {
		buf = driver->buf_in_1;
		write_ptr_modem = driver->write_ptr_1;
		in_busy_ptr = &(driver->in_busy_1);
	} else if (!driver->in_busy_2) {
		buf = driver->buf_in_2;
		write_ptr_modem = driver->write_ptr_2;
		in_busy_ptr = &(driver->in_busy_2);
	}

	if (driver->ch && buf) {
		int r = smd_read_avail(driver->ch);

		if (r > IN_BUF_SIZE) {
			if (r < MAX_IN_BUF_SIZE) {
				pr_err("diag: SMD sending in "
						   "packets upto %d bytes", r);
				buf = krealloc(buf, r, GFP_KERNEL);
			} else {
				pr_err("diag: SMD sending in "
				"packets more than %d bytes", MAX_IN_BUF_SIZE);
				return;
			}
		}
		if (r > 0) {
			if (!buf)
				pr_info("Out of diagmem for Modem\n");
			else {
				APPEND_DEBUG('i');
				smd_read(driver->ch, buf, r);
				APPEND_DEBUG('j');
				write_ptr_modem->length = r;
				*in_busy_ptr = 1;
				diag_device_write(buf, MODEM_DATA,
							 write_ptr_modem);
			}
		}
	}
}

int diag_device_write(void *buf, int proc_num, struct diag_request *write_ptr)
{
	int i, err = 0;

	if (driver->logging_mode == MEMORY_DEVICE_MODE) {
		if (proc_num == APPS_DATA) {
			for (i = 0; i < driver->poolsize_write_struct; i++)
				if (driver->buf_tbl[i].length == 0) {
					driver->buf_tbl[i].buf = buf;
					driver->buf_tbl[i].length =
								 driver->used;
#ifdef DIAG_DEBUG
					pr_debug("diag: ENQUEUE buf ptr"
						   " and length is %x , %d\n",
						   (unsigned int)(driver->buf_
				tbl[i].buf), driver->buf_tbl[i].length);
#endif
					break;
				}
		}
		for (i = 0; i < driver->num_clients; i++)
			if (driver->client_map[i].pid ==
						 driver->logging_process_id)
				break;
		if (i < driver->num_clients) {
			driver->data_ready[i] |= USER_SPACE_LOG_TYPE;
			wake_up_interruptible(&driver->wait_q);
		} else
			return -EINVAL;
	} else if (driver->logging_mode == NO_LOGGING_MODE) {
		if (proc_num == MODEM_DATA) {
			driver->in_busy_1 = 0;
			driver->in_busy_2 = 0;
			queue_work(driver->diag_wq, &(driver->
							diag_read_smd_work));
		} else if (proc_num == QDSP_DATA) {
			driver->in_busy_qdsp_1 = 0;
			driver->in_busy_qdsp_2 = 0;
			queue_work(driver->diag_wq, &(driver->
						diag_read_smd_qdsp_work));
		}  else if (proc_num == WCNSS_DATA) {
			driver->in_busy_wcnss = 0;
			queue_work(driver->diag_wq, &(driver->
				diag_read_smd_wcnss_work));
		}
#ifdef CONFIG_DIAG_SDIO_PIPE
		else if (proc_num == SDIO_DATA) {
			driver->in_busy_sdio = 0;
			queue_work(driver->diag_sdio_wq,
				&(driver->diag_read_sdio_work));
		}
#endif
		err = -1;
	}
#ifdef CONFIG_DIAG_OVER_USB
	else if (driver->logging_mode == USB_MODE) {
		if (proc_num == APPS_DATA) {
			driver->write_ptr_svc = (struct diag_request *)
			(diagmem_alloc(driver, sizeof(struct diag_request),
				 POOL_TYPE_WRITE_STRUCT));
			if (driver->write_ptr_svc) {
				driver->write_ptr_svc->length = driver->used;
				driver->write_ptr_svc->buf = buf;
				err = usb_diag_write(driver->legacy_ch,
						driver->write_ptr_svc);
			} else
				err = -1;
		} else if (proc_num == MODEM_DATA) {
			write_ptr->buf = buf;
#ifdef DIAG_DEBUG
			printk(KERN_INFO "writing data to USB,"
				"pkt length %d\n", write_ptr->length);
			print_hex_dump(KERN_DEBUG, "Written Packet Data to"
					   " USB: ", 16, 1, DUMP_PREFIX_ADDRESS,
					    buf, write_ptr->length, 1);
#endif /* DIAG DEBUG */
			err = usb_diag_write(driver->legacy_ch, write_ptr);
		} else if (proc_num == QDSP_DATA) {
			write_ptr->buf = buf;
			err = usb_diag_write(driver->legacy_ch, write_ptr);
		} else if (proc_num == WCNSS_DATA) {
			write_ptr->buf = buf;
			err = usb_diag_write(driver->legacy_ch, write_ptr);
		}
#ifdef CONFIG_DIAG_SDIO_PIPE
		else if (proc_num == SDIO_DATA) {
			if (machine_is_msm8x60_fusion() ||
					 machine_is_msm8x60_fusn_ffa()) {
				write_ptr->buf = buf;
				err = usb_diag_write(driver->mdm_ch, write_ptr);
			} else
				pr_err("diag: Incorrect sdio data "
						"while USB write\n");
		}
#endif
#ifdef CONFIG_DIAG_HSIC_PIPE
		else if (proc_num == HSIC_DATA) {
			if (driver->hsic_device_enabled) {
				write_ptr->buf = buf;
				err = usb_diag_write(driver->mdm_ch, write_ptr);
			} else
				pr_err("diag: Incorrect hsic data "
						"while USB write\n");
		}
#endif
		APPEND_DEBUG('d');
	}
#endif /* DIAG OVER USB */
    return err;
}

void __diag_smd_wcnss_send_req(void)
{
	void *buf = driver->buf_in_wcnss;
	int *in_busy_wcnss_ptr = &(driver->in_busy_wcnss);
	struct diag_request *write_ptr_wcnss = driver->write_ptr_wcnss;

	if ((!driver->in_busy_wcnss) && driver->ch_wcnss && buf) {
		int r = smd_read_avail(driver->ch_wcnss);
		if (r > IN_BUF_SIZE) {
			if (r < MAX_IN_BUF_SIZE) {
				pr_err("diag: wcnss packets > %d bytes", r);
				buf = krealloc(buf, r, GFP_KERNEL);
			} else {
				pr_err("diag: wcnss pkt > %d", MAX_IN_BUF_SIZE);
				return;
			}
		}
		if (r > 0) {
			if (!buf) {
				pr_err("Out of diagmem for wcnss\n");
			} else {
				APPEND_DEBUG('i');
				smd_read(driver->ch_wcnss, buf, r);
				APPEND_DEBUG('j');
				write_ptr_wcnss->length = r;
				*in_busy_wcnss_ptr = 1;
				diag_device_write(buf, WCNSS_DATA,
					 write_ptr_wcnss);
			}
		}
	}
}

void __diag_smd_qdsp_send_req(void)
{
	void *buf = NULL;
	int *in_busy_qdsp_ptr = NULL;
	struct diag_request *write_ptr_qdsp = NULL;

	if (!driver->in_busy_qdsp_1) {
		buf = driver->buf_in_qdsp_1;
		write_ptr_qdsp = driver->write_ptr_qdsp_1;
		in_busy_qdsp_ptr = &(driver->in_busy_qdsp_1);
	} else if (!driver->in_busy_qdsp_2) {
		buf = driver->buf_in_qdsp_2;
		write_ptr_qdsp = driver->write_ptr_qdsp_2;
		in_busy_qdsp_ptr = &(driver->in_busy_qdsp_2);
	}

	if (driver->chqdsp && buf) {
		int r = smd_read_avail(driver->chqdsp);

		if (r > IN_BUF_SIZE) {
			if (r < MAX_IN_BUF_SIZE) {
				pr_err("diag: SMD sending in "
						   "packets upto %d bytes", r);
				buf = krealloc(buf, r, GFP_KERNEL);
			} else {
				pr_err("diag: SMD sending in "
				"packets more than %d bytes", MAX_IN_BUF_SIZE);
				return;
			}
		}
		if (r > 0) {
			if (!buf)
				printk(KERN_INFO "Out of diagmem for QDSP\n");
			else {
				APPEND_DEBUG('i');
				smd_read(driver->chqdsp, buf, r);
				APPEND_DEBUG('j');
				write_ptr_qdsp->length = r;
				*in_busy_qdsp_ptr = 1;
				diag_device_write(buf, QDSP_DATA,
							 write_ptr_qdsp);
			}
		}
	}
}

static void diag_print_mask_table(void)
{
/* Enable this to print mask table when updated */
#ifdef MASK_DEBUG
	int first;
	int last;
	uint8_t *ptr = driver->msg_masks;
	int i = 0;

	while (*(uint32_t *)(ptr + 4)) {
		first = *(uint32_t *)ptr;
		ptr += 4;
		last = *(uint32_t *)ptr;
		ptr += 4;
		printk(KERN_INFO "SSID %d - %d\n", first, last);
		for (i = 0 ; i <= last - first ; i++)
			printk(KERN_INFO "MASK:%x\n", *((uint32_t *)ptr + i));
		ptr += ((last - first) + 1)*4;

	}
#endif
}

static void diag_update_msg_mask(int start, int end , uint8_t *buf)
{
	int found = 0;
	int first;
	int last;
	uint8_t *ptr = driver->msg_masks;
	uint8_t *ptr_buffer_start = &(*(driver->msg_masks));
	uint8_t *ptr_buffer_end = &(*(driver->msg_masks)) + MSG_MASK_SIZE;

	mutex_lock(&driver->diagchar_mutex);

	/* First SSID can be zero : So check that last is non-zero */
	while (*(uint32_t *)(ptr + 4)) {
		first = *(uint32_t *)ptr;
		ptr += 4;
		last = *(uint32_t *)ptr;
		ptr += 4;
		if (start >= first && start <= last) {
			ptr += (start - first)*4;
			if (end <= last)
				if (CHK_OVERFLOW(ptr_buffer_start, ptr,
						  ptr_buffer_end,
						  (((end - start)+1)*4)))
					memcpy(ptr, buf , ((end - start)+1)*4);
				else
					printk(KERN_CRIT "Not enough"
							 " buffer space for"
							 " MSG_MASK\n");
			else
				printk(KERN_INFO "Unable to copy"
						 " mask change\n");

			found = 1;
			break;
		} else {
			ptr += ((last - first) + 1)*4;
		}
	}
	/* Entry was not found - add new table */
	if (!found) {
		if (CHK_OVERFLOW(ptr_buffer_start, ptr, ptr_buffer_end,
				  8 + ((end - start) + 1)*4)) {
			memcpy(ptr, &(start) , 4);
			ptr += 4;
			memcpy(ptr, &(end), 4);
			ptr += 4;
			memcpy(ptr, buf , ((end - start) + 1)*4);
		} else
			printk(KERN_CRIT " Not enough buffer"
					 " space for MSG_MASK\n");
	}
	mutex_unlock(&driver->diagchar_mutex);
	diag_print_mask_table();

}

static void diag_update_event_mask(uint8_t *buf, int toggle, int num_bytes)
{
	uint8_t *ptr = driver->event_masks;
	uint8_t *temp = buf + 2;

	mutex_lock(&driver->diagchar_mutex);
	if (!toggle)
		memset(ptr, 0 , EVENT_MASK_SIZE);
	else
		if (CHK_OVERFLOW(ptr, ptr,
				 ptr+EVENT_MASK_SIZE, num_bytes))
			memcpy(ptr, temp , num_bytes);
		else
			printk(KERN_CRIT "Not enough buffer space "
					 "for EVENT_MASK\n");
	mutex_unlock(&driver->diagchar_mutex);
}

static void diag_update_log_mask(int equip_id, uint8_t *buf, int num_items)
{
	uint8_t *temp = buf;
	int i = 0;
	unsigned char *ptr_data;
	int offset = (sizeof(struct mask_info))*MAX_EQUIP_ID;
	struct mask_info *ptr = (struct mask_info *)driver->log_masks;

	mutex_lock(&driver->diagchar_mutex);
	/* Check if we already know index of this equipment ID */
	for (i = 0; i < MAX_EQUIP_ID; i++) {
		if ((ptr->equip_id == equip_id) && (ptr->index != 0)) {
			offset = ptr->index;
			break;
		}
		if ((ptr->equip_id == 0) && (ptr->index == 0)) {
			/* Reached a null entry */
			ptr->equip_id = equip_id;
			ptr->num_items = num_items;
			ptr->index = driver->log_masks_length;
			offset = driver->log_masks_length;
			driver->log_masks_length += ((num_items+7)/8);
			break;
		}
		ptr++;
	}
	ptr_data = driver->log_masks + offset;
	if (CHK_OVERFLOW(driver->log_masks, ptr_data, driver->log_masks
					 + LOG_MASK_SIZE, (num_items+7)/8))
		memcpy(ptr_data, temp , (num_items+7)/8);
	else
		printk(KERN_CRIT " Not enough buffer space for LOG_MASK\n");
	mutex_unlock(&driver->diagchar_mutex);
}

static void diag_update_pkt_buffer(unsigned char *buf)
{
	unsigned char *ptr = driver->pkt_buf;
	unsigned char *temp = buf;

	mutex_lock(&driver->diagchar_mutex);
	if (CHK_OVERFLOW(ptr, ptr, ptr + PKT_SIZE, driver->pkt_length))
		memcpy(ptr, temp , driver->pkt_length);
	else
		printk(KERN_CRIT " Not enough buffer space for PKT_RESP\n");
	mutex_unlock(&driver->diagchar_mutex);
}

void diag_update_userspace_clients(unsigned int type)
{
	int i;

	mutex_lock(&driver->diagchar_mutex);
	for (i = 0; i < driver->num_clients; i++)
		if (driver->client_map[i].pid != 0)
			driver->data_ready[i] |= type;
	wake_up_interruptible(&driver->wait_q);
	mutex_unlock(&driver->diagchar_mutex);
}

void diag_update_sleeping_process(int process_id)
{
	int i;

	mutex_lock(&driver->diagchar_mutex);
	for (i = 0; i < driver->num_clients; i++)
		if (driver->client_map[i].pid == process_id) {
			driver->data_ready[i] |= PKT_TYPE;
			break;
		}
	wake_up_interruptible(&driver->wait_q);
	mutex_unlock(&driver->diagchar_mutex);
}

void diag_send_data(struct diag_master_table entry, unsigned char *buf,
					 int len, int type)
{
	driver->pkt_length = len;
	if (entry.process_id != NON_APPS_PROC && type != MODEM_DATA) {
		diag_update_pkt_buffer(buf);
		diag_update_sleeping_process(entry.process_id);
	} else {
		if (len > 0) {
			if (entry.client_id == MODEM_PROC && driver->ch) {
				if (chk_apps_master() &&
					 (int)(*(char *)buf) == MODE_CMD)
					if ((int)(*(char *)(buf+1)) ==
						RESET_ID)
						return;
				smd_write(driver->ch, buf, len);
			} else if (entry.client_id == QDSP_PROC &&
							 driver->chqdsp) {
				smd_write(driver->chqdsp, buf, len);
			} else if (entry.client_id == WCNSS_PROC &&
							 driver->ch_wcnss) {
				smd_write(driver->ch_wcnss, buf, len);
			} else {
				pr_alert("diag: incorrect channel");
			}
		}
	}
}

void diag_modem_mask_update_fn(struct work_struct *work)
{
	diag_send_msg_mask_update(driver->ch_cntl);
	diag_send_log_mask_update(driver->ch_cntl);
	diag_send_event_mask_update(driver->ch_cntl, diag_event_num_bytes);
}

void diag_qdsp_mask_update_fn(struct work_struct *work)
{
	diag_send_msg_mask_update(driver->chqdsp_cntl);
	diag_send_log_mask_update(driver->chqdsp_cntl);
	diag_send_event_mask_update(driver->chqdsp_cntl, diag_event_num_bytes);
}

void diag_wcnss_mask_update_fn(struct work_struct *work)
{
	diag_send_msg_mask_update(driver->ch_wcnss_cntl);
	diag_send_log_mask_update(driver->ch_wcnss_cntl);
	diag_send_event_mask_update(driver->ch_wcnss_cntl,
						 diag_event_num_bytes);
}

void diag_msg_mask_update_fn(struct work_struct *work)
{
	diag_send_msg_mask_update(driver->ch_cntl);
	diag_send_msg_mask_update(driver->chqdsp_cntl);
	diag_send_msg_mask_update(driver->ch_wcnss_cntl);
}

void diag_log_mask_update_fn(struct work_struct *work)
{
	diag_send_log_mask_update(driver->ch_cntl);
	diag_send_log_mask_update(driver->chqdsp_cntl);
	diag_send_log_mask_update(driver->ch_wcnss_cntl);
}

void diag_send_log_mask_update(smd_channel_t *ch)
{
	void *buf = driver->buf_log_mask_update;
	int header_size = sizeof(struct diag_ctrl_log_mask);
	struct mask_info *ptr = (struct mask_info *)driver->log_masks;
	int i, size;

	for (i = 0; i < MAX_EQUIP_ID; i++) {
		size = (ptr->num_items+7)/8;
		/* reached null entry */
		if ((ptr->equip_id == 0) && (ptr->index == 0))
			break;
		driver->log_mask->cmd_type = DIAG_CTRL_MSG_LOG_MASK;
		driver->log_mask->num_items = ptr->num_items;
		driver->log_mask->data_len  = 11 + size;
		driver->log_mask->stream_id = 1; /* 2, if dual stream */
		driver->log_mask->status = 3; /* status for valid mask */
		driver->log_mask->equip_id = ptr->equip_id;
		driver->log_mask->log_mask_size = size;
		memcpy(buf, driver->log_mask, header_size);
		memcpy(buf+header_size, driver->log_masks+ptr->index, size);
		msleep(100);
		if (ch)
			smd_write(ch, buf, header_size + size);
		ptr++;
	}
}

void diag_send_event_mask_update(smd_channel_t *ch, int num_bytes)
{
	void *buf = driver->buf_event_mask_update;
	int header_size = sizeof(struct diag_ctrl_event_mask);

	/* send event mask update */
	driver->event_mask->cmd_type = DIAG_CTRL_MSG_EVENT_MASK;
	driver->event_mask->data_len = 7 + num_bytes;
	driver->event_mask->stream_id = 1; /* 2, if dual stream */
	driver->event_mask->status = 3; /* status for valid mask */
	driver->event_mask->event_config = diag_event_config; /* event config */
	driver->event_mask->event_mask_size = num_bytes;
	memcpy(buf, driver->event_mask, header_size);
	memcpy(buf+header_size, driver->event_masks, num_bytes);
	msleep(100);
	if (ch)
		smd_write(ch, buf, header_size + num_bytes);
}

void diag_send_msg_mask_update(smd_channel_t *ch)
{
	void *buf = driver->buf_msg_mask_update;
	int first, last;
	int header_size = sizeof(struct diag_ctrl_msg_mask);
	uint8_t *ptr = driver->msg_masks;

	while (*(uint32_t *)(ptr + 4)) {
		first = *(uint32_t *)ptr;
		ptr += 4;
		last = *(uint32_t *)ptr;
		ptr += 4;
		/* send event mask update */
		driver->msg_mask->cmd_type = DIAG_CTRL_MSG_F3_MASK;
		driver->msg_mask->msg_mask_size = last - first + 1;
		driver->msg_mask->data_len = 11 +
				 4 * (driver->msg_mask->msg_mask_size);
		driver->msg_mask->stream_id = 1; /* 2, if dual stream */
		driver->msg_mask->status = 3; /* status for valid mask */
		driver->msg_mask->msg_mode = 0; /* Legcay mode */
		driver->msg_mask->ssid_first = first;
		driver->msg_mask->ssid_last = last;
		memcpy(buf, driver->msg_mask, header_size);
		memcpy(buf+header_size, ptr,
			 4 * (driver->msg_mask->msg_mask_size));
		/* since mask updates are slow, so sleep needed as to
		   prevent modem running out of DSM items */
		msleep(100);
		if (ch)
			smd_write(ch, buf,
			 header_size + 4*(driver->msg_mask->msg_mask_size));
		ptr += ((last - first) + 1)*4;
	}
}

static int diag_process_apps_pkt(unsigned char *buf, int len)
{
	uint16_t subsys_cmd_code;
	int subsys_id, ssid_first, ssid_last, ssid_range;
	int packet_type = 1, i, cmd_code;
	unsigned char *temp = buf;
	int data_type;
#if defined(CONFIG_DIAG_OVER_USB)
	int payload_length;
	unsigned char *ptr;
#endif

	/* Set log masks */
	if (*buf == 0x73 && *(int *)(buf+4) == 3) {
		buf += 8;
		/* Read Equip ID and pass as first param below*/
		diag_update_log_mask(*(int *)buf, buf+8, *(int *)(buf+4));
		diag_update_userspace_clients(LOG_MASKS_TYPE);
#if defined(CONFIG_DIAG_OVER_USB)
		if (chk_apps_only()) {
			driver->apps_rsp_buf[0] = 0x73;
			*(int *)(driver->apps_rsp_buf + 4) = 0x3; /* op. ID */
			*(int *)(driver->apps_rsp_buf + 8) = 0x0; /* success */
			payload_length = 8 + ((*(int *)(buf + 4)) + 7)/8;
			for (i = 0; i < payload_length; i++)
				*(int *)(driver->apps_rsp_buf+12+i) = *(buf+i);
			queue_work(driver->diag_cntl_wq,
				 &(driver->diag_log_mask_update_work));
			ENCODE_RSP_AND_SEND(12 + payload_length - 1);
			return 0;
		} else
			buf = temp;
#endif
	} /* Check for set message mask  */
	else if ((*buf == 0x7d) && (*(buf+1) == 0x4)) {
		ssid_first = *(uint16_t *)(buf + 2);
		ssid_last = *(uint16_t *)(buf + 4);
		ssid_range = 4 * (ssid_last - ssid_first + 1);
		diag_update_msg_mask(ssid_first, ssid_last , buf + 8);
		diag_update_userspace_clients(MSG_MASKS_TYPE);
#if defined(CONFIG_DIAG_OVER_USB)
		if (chk_apps_only()) {
			for (i = 0; i < 8 + ssid_range; i++)
				*(driver->apps_rsp_buf + i) = *(buf+i);
			*(driver->apps_rsp_buf + 6) = 0x1;
			queue_work(driver->diag_cntl_wq,
				 &(driver->diag_msg_mask_update_work));
			ENCODE_RSP_AND_SEND(8 + ssid_range - 1);
			return 0;
		} else
			buf = temp;
#endif
	} else if (*buf == 0x82) {	/* event mask change */
		buf += 4;
		diag_event_num_bytes =  (*(uint16_t *)buf)/8+1;
		diag_update_event_mask(buf, 1, (*(uint16_t *)buf)/8+1);
		diag_update_userspace_clients(EVENT_MASKS_TYPE);
#if defined(CONFIG_DIAG_OVER_USB)
		if (chk_apps_only()) {
			driver->apps_rsp_buf[0] = 0x82;
			driver->apps_rsp_buf[1] = 0x0;
			*(uint16_t *)(driver->apps_rsp_buf + 2) = 0x0;
			*(uint16_t *)(driver->apps_rsp_buf + 4) =
							EVENT_LAST_ID + 1;
			for (i = 0; i < EVENT_LAST_ID/8 + 1; i++)
				*(unsigned char *)(driver->apps_rsp_buf + 6 + i)
									 = 0x0;
			/* cannot do this on work queue, as each event update
			needs a num_bytes variable. Each queue_work call will
			overwrite the previous input, as its the same struct */
			diag_send_event_mask_update(driver->ch_cntl,
							 diag_event_num_bytes);
			diag_send_event_mask_update(driver->chqdsp_cntl,
							 diag_event_num_bytes);
			diag_send_event_mask_update(driver->ch_wcnss_cntl,
							 diag_event_num_bytes);
			ENCODE_RSP_AND_SEND(6 + EVENT_LAST_ID/8);
			return 0;
		} else
			buf = temp;
#endif
	} else if (*buf == 0x60) {
		diag_event_config = *(buf+1);
#if defined(CONFIG_DIAG_OVER_USB)
		if (chk_apps_only()) {
			driver->apps_rsp_buf[0] = 0x60;
			driver->apps_rsp_buf[1] = 0x0;
			driver->apps_rsp_buf[2] = 0x0;
			diag_send_event_mask_update(driver->ch_cntl,
							 diag_event_num_bytes);
			diag_send_event_mask_update(driver->chqdsp_cntl,
							 diag_event_num_bytes);
			diag_send_event_mask_update(driver->ch_wcnss_cntl,
							 diag_event_num_bytes);
			ENCODE_RSP_AND_SEND(2);
			return 0;
		}
#endif
	}
	/* Check for registered clients and forward packet to apropriate proc */
	cmd_code = (int)(*(char *)buf);
	temp++;
	subsys_id = (int)(*(char *)temp);
	temp++;
	subsys_cmd_code = *(uint16_t *)temp;
	temp += 2;
	data_type = APPS_DATA;
	/* Dont send any command other than mode reset */
	if (chk_apps_master() && cmd_code == MODE_CMD) {
		if (subsys_id != RESET_ID)
			data_type = MODEM_DATA;
	}

	pr_debug("diag: %d %d %d", cmd_code, subsys_id, subsys_cmd_code);
	for (i = 0; i < diag_max_reg; i++) {
		entry = driver->table[i];
		if (entry.process_id != NO_PROCESS) {
			if (entry.cmd_code == cmd_code && entry.subsys_id ==
				 subsys_id && entry.cmd_code_lo <=
							 subsys_cmd_code &&
				  entry.cmd_code_hi >= subsys_cmd_code) {
				diag_send_data(entry, buf, len, data_type);
				packet_type = 0;
			} else if (entry.cmd_code == 255
				  && cmd_code == 75) {
				if (entry.subsys_id ==
					subsys_id &&
				   entry.cmd_code_lo <=
					subsys_cmd_code &&
					 entry.cmd_code_hi >=
					subsys_cmd_code) {
					diag_send_data(entry, buf, len,
								 data_type);
					packet_type = 0;
				}
			} else if (entry.cmd_code == 255 &&
				  entry.subsys_id == 255) {
				if (entry.cmd_code_lo <=
						 cmd_code &&
						 entry.
						cmd_code_hi >= cmd_code) {
					diag_send_data(entry, buf, len,
								 data_type);
					packet_type = 0;
				}
			}
		}
	}
#if defined(CONFIG_DIAG_OVER_USB)
	/* Check for Apps Only & get event mask request */
	if (!(driver->ch) && chk_apps_only() && *buf == 0x81) {
		driver->apps_rsp_buf[0] = 0x81;
		driver->apps_rsp_buf[1] = 0x0;
		*(uint16_t *)(driver->apps_rsp_buf + 2) = 0x0;
		*(uint16_t *)(driver->apps_rsp_buf + 4) = EVENT_LAST_ID + 1;
		for (i = 0; i < EVENT_LAST_ID/8 + 1; i++)
			*(unsigned char *)(driver->apps_rsp_buf + 6 + i) = 0x0;
		ENCODE_RSP_AND_SEND(6 + EVENT_LAST_ID/8);
		return 0;
	}
	/* Get log ID range & Check for Apps Only */
	else if (!(driver->ch) && chk_apps_only()
			  && (*buf == 0x73) && *(int *)(buf+4) == 1) {
		driver->apps_rsp_buf[0] = 0x73;
		*(int *)(driver->apps_rsp_buf + 4) = 0x1; /* operation ID */
		*(int *)(driver->apps_rsp_buf + 8) = 0x0; /* success code */
		*(int *)(driver->apps_rsp_buf + 12) = LOG_GET_ITEM_NUM(LOG_0);
		*(int *)(driver->apps_rsp_buf + 16) = LOG_GET_ITEM_NUM(LOG_1);
		*(int *)(driver->apps_rsp_buf + 20) = LOG_GET_ITEM_NUM(LOG_2);
		*(int *)(driver->apps_rsp_buf + 24) = LOG_GET_ITEM_NUM(LOG_3);
		*(int *)(driver->apps_rsp_buf + 28) = LOG_GET_ITEM_NUM(LOG_4);
		*(int *)(driver->apps_rsp_buf + 32) = LOG_GET_ITEM_NUM(LOG_5);
		*(int *)(driver->apps_rsp_buf + 36) = LOG_GET_ITEM_NUM(LOG_6);
		*(int *)(driver->apps_rsp_buf + 40) = LOG_GET_ITEM_NUM(LOG_7);
		*(int *)(driver->apps_rsp_buf + 44) = LOG_GET_ITEM_NUM(LOG_8);
		*(int *)(driver->apps_rsp_buf + 48) = LOG_GET_ITEM_NUM(LOG_9);
		*(int *)(driver->apps_rsp_buf + 52) = LOG_GET_ITEM_NUM(LOG_10);
		*(int *)(driver->apps_rsp_buf + 56) = LOG_GET_ITEM_NUM(LOG_11);
		*(int *)(driver->apps_rsp_buf + 60) = LOG_GET_ITEM_NUM(LOG_12);
		*(int *)(driver->apps_rsp_buf + 64) = LOG_GET_ITEM_NUM(LOG_13);
		*(int *)(driver->apps_rsp_buf + 68) = LOG_GET_ITEM_NUM(LOG_14);
		*(int *)(driver->apps_rsp_buf + 72) = LOG_GET_ITEM_NUM(LOG_15);
		ENCODE_RSP_AND_SEND(75);
		return 0;
	}
	/* Respond to Get SSID Range request message */
	else if (!(driver->ch) && chk_apps_only()
			 && (*buf == 0x7d) && (*(buf+1) == 0x1)) {
		driver->apps_rsp_buf[0] = 0x7d;
		driver->apps_rsp_buf[1] = 0x1;
		driver->apps_rsp_buf[2] = 0x1;
		driver->apps_rsp_buf[3] = 0x0;
		*(int *)(driver->apps_rsp_buf + 4) = MSG_MASK_TBL_CNT;
		*(uint16_t *)(driver->apps_rsp_buf + 8) = MSG_SSID_0;
		*(uint16_t *)(driver->apps_rsp_buf + 10) = MSG_SSID_0_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 12) = MSG_SSID_1;
		*(uint16_t *)(driver->apps_rsp_buf + 14) = MSG_SSID_1_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 16) = MSG_SSID_2;
		*(uint16_t *)(driver->apps_rsp_buf + 18) = MSG_SSID_2_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 20) = MSG_SSID_3;
		*(uint16_t *)(driver->apps_rsp_buf + 22) = MSG_SSID_3_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 24) = MSG_SSID_4;
		*(uint16_t *)(driver->apps_rsp_buf + 26) = MSG_SSID_4_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 28) = MSG_SSID_5;
		*(uint16_t *)(driver->apps_rsp_buf + 30) = MSG_SSID_5_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 32) = MSG_SSID_6;
		*(uint16_t *)(driver->apps_rsp_buf + 34) = MSG_SSID_6_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 36) = MSG_SSID_7;
		*(uint16_t *)(driver->apps_rsp_buf + 38) = MSG_SSID_7_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 40) = MSG_SSID_8;
		*(uint16_t *)(driver->apps_rsp_buf + 42) = MSG_SSID_8_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 44) = MSG_SSID_9;
		*(uint16_t *)(driver->apps_rsp_buf + 46) = MSG_SSID_9_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 48) = MSG_SSID_10;
		*(uint16_t *)(driver->apps_rsp_buf + 50) = MSG_SSID_10_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 52) = MSG_SSID_11;
		*(uint16_t *)(driver->apps_rsp_buf + 54) = MSG_SSID_11_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 56) = MSG_SSID_12;
		*(uint16_t *)(driver->apps_rsp_buf + 58) = MSG_SSID_12_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 60) = MSG_SSID_13;
		*(uint16_t *)(driver->apps_rsp_buf + 62) = MSG_SSID_13_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 64) = MSG_SSID_14;
		*(uint16_t *)(driver->apps_rsp_buf + 66) = MSG_SSID_14_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 68) = MSG_SSID_15;
		*(uint16_t *)(driver->apps_rsp_buf + 70) = MSG_SSID_15_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 72) = MSG_SSID_16;
		*(uint16_t *)(driver->apps_rsp_buf + 74) = MSG_SSID_16_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 76) = MSG_SSID_17;
		*(uint16_t *)(driver->apps_rsp_buf + 78) = MSG_SSID_17_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 80) = MSG_SSID_18;
		*(uint16_t *)(driver->apps_rsp_buf + 82) = MSG_SSID_18_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 84) = MSG_SSID_19;
		*(uint16_t *)(driver->apps_rsp_buf + 86) = MSG_SSID_19_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 88) = MSG_SSID_20;
		*(uint16_t *)(driver->apps_rsp_buf + 90) = MSG_SSID_20_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 92) = MSG_SSID_21;
		*(uint16_t *)(driver->apps_rsp_buf + 94) = MSG_SSID_21_LAST;
		*(uint16_t *)(driver->apps_rsp_buf + 96) = MSG_SSID_22;
		*(uint16_t *)(driver->apps_rsp_buf + 98) = MSG_SSID_22_LAST;
		ENCODE_RSP_AND_SEND(99);
		return 0;
	}
	/* Check for Apps Only Respond to Get Subsys Build mask */
	else if (!(driver->ch) && chk_apps_only()
			 && (*buf == 0x7d) && (*(buf+1) == 0x2)) {
		ssid_first = *(uint16_t *)(buf + 2);
		ssid_last = *(uint16_t *)(buf + 4);
		ssid_range = 4 * (ssid_last - ssid_first + 1);
		/* frame response */
		driver->apps_rsp_buf[0] = 0x7d;
		driver->apps_rsp_buf[1] = 0x2;
		*(uint16_t *)(driver->apps_rsp_buf + 2) = ssid_first;
		*(uint16_t *)(driver->apps_rsp_buf + 4) = ssid_last;
		driver->apps_rsp_buf[6] = 0x1;
		driver->apps_rsp_buf[7] = 0x0;
		ptr = driver->apps_rsp_buf + 8;
		/* bld time masks */
		switch (ssid_first) {
		case MSG_SSID_0:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_0[i/4];
			break;
		case MSG_SSID_1:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_1[i/4];
			break;
		case MSG_SSID_2:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_2[i/4];
			break;
		case MSG_SSID_3:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_3[i/4];
			break;
		case MSG_SSID_4:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_4[i/4];
			break;
		case MSG_SSID_5:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_5[i/4];
			break;
		case MSG_SSID_6:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_6[i/4];
			break;
		case MSG_SSID_7:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_7[i/4];
			break;
		case MSG_SSID_8:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_8[i/4];
			break;
		case MSG_SSID_9:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_9[i/4];
			break;
		case MSG_SSID_10:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_10[i/4];
			break;
		case MSG_SSID_11:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_11[i/4];
			break;
		case MSG_SSID_12:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_12[i/4];
			break;
		case MSG_SSID_13:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_13[i/4];
			break;
		case MSG_SSID_14:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_14[i/4];
			break;
		case MSG_SSID_15:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_15[i/4];
			break;
		case MSG_SSID_16:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_16[i/4];
			break;
		case MSG_SSID_17:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_17[i/4];
			break;
		case MSG_SSID_18:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_18[i/4];
			break;
		case MSG_SSID_19:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_19[i/4];
			break;
		case MSG_SSID_20:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_20[i/4];
			break;
		case MSG_SSID_21:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_21[i/4];
			break;
		case MSG_SSID_22:
			for (i = 0; i < ssid_range; i += 4)
				*(int *)(ptr + i) = msg_bld_masks_22[i/4];
			break;
		}
		ENCODE_RSP_AND_SEND(8 + ssid_range - 1);
		return 0;
	}
	/* Check for download command */
	else if ((cpu_is_msm8x60() || chk_apps_master()) && (*buf == 0x3A)) {
		/* send response back */
		driver->apps_rsp_buf[0] = *buf;
		ENCODE_RSP_AND_SEND(0);
		msleep(5000);
		/* call download API */
		msm_set_restart_mode(RESTART_DLOAD);
		printk(KERN_CRIT "diag: download mode set, Rebooting SoC..\n");
		kernel_restart(NULL);
		/* Not required, represents that command isnt sent to modem */
		return 0;
	}
	/* Check for polling for Apps only DIAG */
	else if ((*buf == 0x4b) && (*(buf+1) == 0x32) &&
		(*(buf+2) == 0x03)) {
		/* If no one has registered for polling */
		if (chk_polling_response()) {
			/* Respond to polling for Apps only DIAG */
			for (i = 0; i < 3; i++)
				driver->apps_rsp_buf[i] = *(buf+i);
			for (i = 0; i < 13; i++)
				driver->apps_rsp_buf[i+3] = 0;

			ENCODE_RSP_AND_SEND(15);
			return 0;
		}
	}
	 /* Check for ID for NO MODEM present */
	else if (chk_polling_response()) {
		/* respond to 0x0 command */
		if (*buf == 0x00) {
			for (i = 0; i < 55; i++)
				driver->apps_rsp_buf[i] = 0;

			ENCODE_RSP_AND_SEND(54);
			return 0;
		}
		/* respond to 0x7c command */
		else if (*buf == 0x7c) {
			driver->apps_rsp_buf[0] = 0x7c;
			for (i = 1; i < 8; i++)
				driver->apps_rsp_buf[i] = 0;
			/* Tools ID for APQ 8060 */
			*(int *)(driver->apps_rsp_buf + 8) =
							 chk_config_get_id();
			*(unsigned char *)(driver->apps_rsp_buf + 12) = '\0';
			*(unsigned char *)(driver->apps_rsp_buf + 13) = '\0';
			ENCODE_RSP_AND_SEND(13);
			return 0;
		}
	}
#endif
		return packet_type;
}

#ifdef CONFIG_DIAG_OVER_USB
void diag_send_error_rsp(int index)
{
	int i;

	if (index > 490) {
		pr_err("diag: error response too huge, aborting\n");
		return;
	}
	driver->apps_rsp_buf[0] = 0x13; /* error code 13 */
	for (i = 0; i < index; i++)
		driver->apps_rsp_buf[i+1] = *(driver->hdlc_buf+i);
	ENCODE_RSP_AND_SEND(index - 3);
}
#else
static inline void diag_send_error_rsp(int index) {}
#endif

void diag_process_hdlc(void *data, unsigned len)
{
	struct diag_hdlc_decode_type hdlc;
	int ret, type = 0;
	pr_debug("diag: HDLC decode fn, len of data  %d\n", len);
	hdlc.dest_ptr = driver->hdlc_buf;
	hdlc.dest_size = USB_MAX_OUT_BUF;
	hdlc.src_ptr = data;
	hdlc.src_size = len;
	hdlc.src_idx = 0;
	hdlc.dest_idx = 0;
	hdlc.escaping = 0;

	ret = diag_hdlc_decode(&hdlc);

	if (ret)
		type = diag_process_apps_pkt(driver->hdlc_buf,
							  hdlc.dest_idx - 3);
	else if (driver->debug_flag) {
		printk(KERN_ERR "Packet dropped due to bad HDLC coding/CRC"
				" errors or partial packet received, packet"
				" length = %d\n", len);
		print_hex_dump(KERN_DEBUG, "Dropped Packet Data: ", 16, 1,
					   DUMP_PREFIX_ADDRESS, data, len, 1);
		driver->debug_flag = 0;
	}
	/* send error responses from APPS for Central Routing */
	if (type == 1 && chk_apps_only()) {
		diag_send_error_rsp(hdlc.dest_idx);
		type = 0;
	}
	/* implies this packet is NOT meant for apps */
	if (!(driver->ch) && type == 1) {
		if (chk_apps_only()) {
			diag_send_error_rsp(hdlc.dest_idx);
		} else { /* APQ 8060, Let Q6 respond */
			if (driver->chqdsp)
				smd_write(driver->chqdsp, driver->hdlc_buf,
						  hdlc.dest_idx - 3);
		}
		type = 0;
	}

#ifdef DIAG_DEBUG
	pr_debug("diag: hdlc.dest_idx = %d", hdlc.dest_idx);
	for (i = 0; i < hdlc.dest_idx; i++)
		printk(KERN_DEBUG "\t%x", *(((unsigned char *)
							driver->hdlc_buf)+i));
#endif /* DIAG DEBUG */
	/* ignore 2 bytes for CRC, one for 7E and send */
	if ((driver->ch) && (ret) && (type) && (hdlc.dest_idx > 3)) {
		APPEND_DEBUG('g');
		smd_write(driver->ch, driver->hdlc_buf, hdlc.dest_idx - 3);
		APPEND_DEBUG('h');
#ifdef DIAG_DEBUG
		printk(KERN_INFO "writing data to SMD, pkt length %d\n", len);
		print_hex_dump(KERN_DEBUG, "Written Packet Data to SMD: ", 16,
			       1, DUMP_PREFIX_ADDRESS, data, len, 1);
#endif /* DIAG DEBUG */
	}
}

#ifdef CONFIG_DIAG_OVER_USB
/* 2+1 for modem ; 2 for LPASS ; 1 for WCNSS */
#define N_LEGACY_WRITE	(driver->poolsize + 6)
#define N_LEGACY_READ	1

int diagfwd_connect(void)
{
	int err;

	printk(KERN_DEBUG "diag: USB connected\n");
	err = usb_diag_alloc_req(driver->legacy_ch, N_LEGACY_WRITE,
			N_LEGACY_READ);
	if (err)
		printk(KERN_ERR "diag: unable to alloc USB req on legacy ch");

	driver->usb_connected = 1;
	driver->in_busy_1 = 0;
	driver->in_busy_2 = 0;
	driver->in_busy_qdsp_1 = 0;
	driver->in_busy_qdsp_2 = 0;
	driver->in_busy_wcnss = 0;

	/* Poll SMD channels to check for data*/
	queue_work(driver->diag_wq, &(driver->diag_read_smd_work));
	queue_work(driver->diag_wq, &(driver->diag_read_smd_qdsp_work));
	queue_work(driver->diag_wq, &(driver->diag_read_smd_wcnss_work));
	/* Poll SMD CNTL channels to check for data */
	diag_smd_cntl_notify(NULL, SMD_EVENT_DATA);
	diag_smd_qdsp_cntl_notify(NULL, SMD_EVENT_DATA);
	diag_smd_wcnss_cntl_notify(NULL, SMD_EVENT_DATA);
	/* Poll USB channel to check for data*/
	queue_work(driver->diag_wq, &(driver->diag_read_work));
#ifdef CONFIG_DIAG_SDIO_PIPE
	if (machine_is_msm8x60_fusion() || machine_is_msm8x60_fusn_ffa()) {
		if (driver->mdm_ch && !IS_ERR(driver->mdm_ch))
			diagfwd_connect_sdio();
		else
			printk(KERN_INFO "diag: No USB MDM ch");
	}
#endif
	return 0;
}

int diagfwd_disconnect(void)
{
	printk(KERN_DEBUG "diag: USB disconnected\n");
	driver->usb_connected = 0;
	driver->debug_flag = 1;
	usb_diag_free_req(driver->legacy_ch);
	if (driver->logging_mode == USB_MODE) {
		driver->in_busy_1 = 1;
		driver->in_busy_2 = 1;
		driver->in_busy_qdsp_1 = 1;
		driver->in_busy_qdsp_2 = 1;
		driver->in_busy_wcnss = 1;
	}
#ifdef CONFIG_DIAG_SDIO_PIPE
	if (machine_is_msm8x60_fusion() || machine_is_msm8x60_fusn_ffa())
		if (driver->mdm_ch && !IS_ERR(driver->mdm_ch))
			diagfwd_disconnect_sdio();
#endif
	/* TBD - notify and flow control SMD */
	return 0;
}

int diagfwd_write_complete(struct diag_request *diag_write_ptr)
{
	unsigned char *buf = diag_write_ptr->buf;
	/*Determine if the write complete is for data from modem/apps/q6 */
	/* Need a context variable here instead */
	if (buf == (void *)driver->buf_in_1) {
		driver->in_busy_1 = 0;
		APPEND_DEBUG('o');
		queue_work(driver->diag_wq, &(driver->diag_read_smd_work));
	} else if (buf == (void *)driver->buf_in_2) {
		driver->in_busy_2 = 0;
		APPEND_DEBUG('O');
		queue_work(driver->diag_wq, &(driver->diag_read_smd_work));
	} else if (buf == (void *)driver->buf_in_qdsp_1) {
		driver->in_busy_qdsp_1 = 0;
		APPEND_DEBUG('p');
		queue_work(driver->diag_wq, &(driver->diag_read_smd_qdsp_work));
	} else if (buf == (void *)driver->buf_in_qdsp_2) {
		driver->in_busy_qdsp_2 = 0;
		APPEND_DEBUG('P');
		queue_work(driver->diag_wq, &(driver->diag_read_smd_qdsp_work));
	} else if (buf == (void *)driver->buf_in_wcnss) {
		driver->in_busy_wcnss = 0;
		APPEND_DEBUG('R');
		queue_work(driver->diag_wq,
			 &(driver->diag_read_smd_wcnss_work));
	}
#ifdef CONFIG_DIAG_SDIO_PIPE
	else if (buf == (void *)driver->buf_in_sdio)
		if (machine_is_msm8x60_fusion() ||
			 machine_is_msm8x60_fusn_ffa())
			diagfwd_write_complete_sdio();
		else
			pr_err("diag: Incorrect buffer pointer while WRITE");
#endif
	else {
		diagmem_free(driver, (unsigned char *)buf, POOL_TYPE_HDLC);
		diagmem_free(driver, (unsigned char *)diag_write_ptr,
						 POOL_TYPE_WRITE_STRUCT);
		APPEND_DEBUG('q');
	}
	return 0;
}

int diagfwd_read_complete(struct diag_request *diag_read_ptr)
{
	int status = diag_read_ptr->status;
	unsigned char *buf = diag_read_ptr->buf;

	/* Determine if the read complete is for data on legacy/mdm ch */
	if (buf == (void *)driver->usb_buf_out) {
		driver->read_len_legacy = diag_read_ptr->actual;
		APPEND_DEBUG('s');
#ifdef DIAG_DEBUG
		printk(KERN_INFO "read data from USB, pkt length %d",
		    diag_read_ptr->actual);
		print_hex_dump(KERN_DEBUG, "Read Packet Data from USB: ", 16, 1,
		       DUMP_PREFIX_ADDRESS, diag_read_ptr->buf,
		       diag_read_ptr->actual, 1);
#endif /* DIAG DEBUG */
		if (driver->logging_mode == USB_MODE) {
			if (status != -ECONNRESET && status != -ESHUTDOWN)
				queue_work(driver->diag_wq,
					&(driver->diag_proc_hdlc_work));
			else
				queue_work(driver->diag_wq,
						 &(driver->diag_read_work));
		}
	}
#ifdef CONFIG_DIAG_SDIO_PIPE
	else if (buf == (void *)driver->usb_buf_mdm_out) {
		if (machine_is_msm8x60_fusion() ||
				 machine_is_msm8x60_fusn_ffa()) {
			driver->read_len_mdm = diag_read_ptr->actual;
			diagfwd_read_complete_sdio();
		} else
			pr_err("diag: Incorrect buffer pointer while READ");
	}
#endif
	else
		printk(KERN_ERR "diag: Unknown buffer ptr from USB");

	return 0;
}

void diag_read_work_fn(struct work_struct *work)
{
	APPEND_DEBUG('d');
	driver->usb_read_ptr->buf = driver->usb_buf_out;
	driver->usb_read_ptr->length = USB_MAX_OUT_BUF;
	usb_diag_read(driver->legacy_ch, driver->usb_read_ptr);
	APPEND_DEBUG('e');
}

void diag_process_hdlc_fn(struct work_struct *work)
{
	APPEND_DEBUG('D');
	diag_process_hdlc(driver->usb_buf_out, driver->read_len_legacy);
	diag_read_work_fn(work);
	APPEND_DEBUG('E');
}

void diag_usb_legacy_notifier(void *priv, unsigned event,
			struct diag_request *d_req)
{
	switch (event) {
	case USB_DIAG_CONNECT:
		diagfwd_connect();
		break;
	case USB_DIAG_DISCONNECT:
		diagfwd_disconnect();
		break;
	case USB_DIAG_READ_DONE:
		diagfwd_read_complete(d_req);
		break;
	case USB_DIAG_WRITE_DONE:
		diagfwd_write_complete(d_req);
		break;
	default:
		printk(KERN_ERR "Unknown event from USB diag\n");
		break;
	}
}

#endif /* DIAG OVER USB */

static void diag_smd_notify(void *ctxt, unsigned event)
{
	if (event == SMD_EVENT_CLOSE) {
		pr_info("diag: clean modem registration\n");
		diag_clear_reg(MODEM_PROC);
		driver->ch = 0;
		return;
	} else if (event == SMD_EVENT_OPEN) {
		driver->ch = ch_temp;
	}
	queue_work(driver->diag_wq, &(driver->diag_read_smd_work));
}

#if defined(CONFIG_MSM_N_WAY_SMD)
static void diag_smd_qdsp_notify(void *ctxt, unsigned event)
{
	if (event == SMD_EVENT_CLOSE) {
		pr_info("diag: clean lpass registration\n");
		diag_clear_reg(QDSP_PROC);
		driver->chqdsp = 0;
		return;
	} else if (event == SMD_EVENT_OPEN) {
		driver->chqdsp = chqdsp_temp;
	}
	queue_work(driver->diag_wq, &(driver->diag_read_smd_qdsp_work));
}
#endif

static void diag_smd_wcnss_notify(void *ctxt, unsigned event)
{
	if (event == SMD_EVENT_CLOSE) {
		pr_info("diag: clean wcnss registration\n");
		diag_clear_reg(WCNSS_PROC);
		driver->ch_wcnss = 0;
		return;
	} else if (event == SMD_EVENT_OPEN) {
		driver->ch_wcnss = ch_wcnss_temp;
	}
	queue_work(driver->diag_wq, &(driver->diag_read_smd_wcnss_work));
}

static int diag_smd_probe(struct platform_device *pdev)
{
	int r = 0;

	if (pdev->id == SMD_APPS_MODEM) {
		r = smd_open("DIAG", &driver->ch, driver, diag_smd_notify);
		ch_temp = driver->ch;
	}
#if defined(CONFIG_MSM_N_WAY_SMD)
	if (pdev->id == SMD_APPS_QDSP) {
		r = smd_named_open_on_edge("DIAG", SMD_APPS_QDSP
			, &driver->chqdsp, driver, diag_smd_qdsp_notify);
		chqdsp_temp = driver->chqdsp;
	}
#endif
	if (pdev->id == SMD_APPS_WCNSS) {
		r = smd_named_open_on_edge("APPS_RIVA_DATA", SMD_APPS_WCNSS
			, &driver->ch_wcnss, driver, diag_smd_wcnss_notify);
		ch_wcnss_temp = driver->ch_wcnss;
	}
	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	pr_debug("diag: open SMD port, Id = %d, r = %d\n", pdev->id, r);

	return 0;
}

static int diagfwd_runtime_suspend(struct device *dev)
{
	dev_dbg(dev, "pm_runtime: suspending...\n");
	return 0;
}

static int diagfwd_runtime_resume(struct device *dev)
{
	dev_dbg(dev, "pm_runtime: resuming...\n");
	return 0;
}

static const struct dev_pm_ops diagfwd_dev_pm_ops = {
	.runtime_suspend = diagfwd_runtime_suspend,
	.runtime_resume = diagfwd_runtime_resume,
};

static struct platform_driver msm_smd_ch1_driver = {

	.probe = diag_smd_probe,
	.driver = {
		   .name = "DIAG",
		   .owner = THIS_MODULE,
		   .pm   = &diagfwd_dev_pm_ops,
		   },
};

static struct platform_driver diag_smd_lite_driver = {

	.probe = diag_smd_probe,
	.driver = {
		   .name = "APPS_RIVA_DATA",
		   .owner = THIS_MODULE,
		   .pm   = &diagfwd_dev_pm_ops,
		   },
};

void diagfwd_init(void)
{
	diag_debug_buf_idx = 0;
	driver->read_len_legacy = 0;
	driver->use_device_tree = has_device_tree();

	if (driver->event_mask == NULL) {
		driver->event_mask = kzalloc(sizeof(
			struct diag_ctrl_event_mask), GFP_KERNEL);
		if (driver->event_mask == NULL)
			goto err;
	}
	if (driver->msg_mask == NULL) {
		driver->msg_mask = kzalloc(sizeof(
			struct diag_ctrl_msg_mask), GFP_KERNEL);
		if (driver->msg_mask == NULL)
			goto err;
	}
	if (driver->log_mask == NULL) {
		driver->log_mask = kzalloc(sizeof(
			struct diag_ctrl_log_mask), GFP_KERNEL);
		if (driver->log_mask == NULL)
			goto err;
	}
	if (driver->buf_in_1 == NULL) {
		driver->buf_in_1 = kzalloc(IN_BUF_SIZE, GFP_KERNEL);
		if (driver->buf_in_1 == NULL)
			goto err;
	}
	if (driver->buf_in_2 == NULL) {
		driver->buf_in_2 = kzalloc(IN_BUF_SIZE, GFP_KERNEL);
		if (driver->buf_in_2 == NULL)
			goto err;
	}
	if (driver->buf_in_qdsp_1 == NULL) {
		driver->buf_in_qdsp_1 = kzalloc(IN_BUF_SIZE, GFP_KERNEL);
		if (driver->buf_in_qdsp_1 == NULL)
			goto err;
	}
	if (driver->buf_in_qdsp_2 == NULL) {
		driver->buf_in_qdsp_2 = kzalloc(IN_BUF_SIZE, GFP_KERNEL);
		if (driver->buf_in_qdsp_2 == NULL)
			goto err;
	}
	if (driver->buf_in_wcnss == NULL) {
		driver->buf_in_wcnss = kzalloc(IN_BUF_SIZE, GFP_KERNEL);
		if (driver->buf_in_wcnss == NULL)
			goto err;
	}
	if (driver->buf_msg_mask_update == NULL) {
		driver->buf_msg_mask_update = kzalloc(APPS_BUF_SIZE,
								 GFP_KERNEL);
		if (driver->buf_msg_mask_update == NULL)
			goto err;
	}
	if (driver->buf_log_mask_update == NULL) {
		driver->buf_log_mask_update = kzalloc(APPS_BUF_SIZE,
								 GFP_KERNEL);
		if (driver->buf_log_mask_update == NULL)
			goto err;
	}
	if (driver->buf_event_mask_update == NULL) {
		driver->buf_event_mask_update = kzalloc(APPS_BUF_SIZE,
								 GFP_KERNEL);
		if (driver->buf_event_mask_update == NULL)
			goto err;
	}
	if (driver->usb_buf_out  == NULL &&
	     (driver->usb_buf_out = kzalloc(USB_MAX_OUT_BUF,
					 GFP_KERNEL)) == NULL)
		goto err;
	if (driver->hdlc_buf == NULL
	    && (driver->hdlc_buf = kzalloc(HDLC_MAX, GFP_KERNEL)) == NULL)
		goto err;
	if (driver->user_space_data == NULL)
		driver->user_space_data = kzalloc(USER_SPACE_DATA, GFP_KERNEL);
		if (driver->user_space_data == NULL)
			goto err;
	if (driver->msg_masks == NULL
	    && (driver->msg_masks = kzalloc(MSG_MASK_SIZE,
					     GFP_KERNEL)) == NULL)
		goto err;
	if (driver->log_masks == NULL &&
	    (driver->log_masks = kzalloc(LOG_MASK_SIZE, GFP_KERNEL)) == NULL)
		goto err;
	driver->log_masks_length = (sizeof(struct mask_info))*MAX_EQUIP_ID;
	if (driver->event_masks == NULL &&
	    (driver->event_masks = kzalloc(EVENT_MASK_SIZE,
					    GFP_KERNEL)) == NULL)
		goto err;
	if (driver->client_map == NULL &&
	    (driver->client_map = kzalloc
	     ((driver->num_clients) * sizeof(struct diag_client_map),
		   GFP_KERNEL)) == NULL)
		goto err;
	if (driver->buf_tbl == NULL)
			driver->buf_tbl = kzalloc(buf_tbl_size *
			  sizeof(struct diag_write_device), GFP_KERNEL);
	if (driver->buf_tbl == NULL)
		goto err;
	if (driver->data_ready == NULL &&
	     (driver->data_ready = kzalloc(driver->num_clients * sizeof(int)
							, GFP_KERNEL)) == NULL)
		goto err;
	if (driver->table == NULL &&
	     (driver->table = kzalloc(diag_max_reg*
		      sizeof(struct diag_master_table),
		       GFP_KERNEL)) == NULL)
		goto err;
	if (driver->write_ptr_1 == NULL) {
		driver->write_ptr_1 = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->write_ptr_1 == NULL)
			goto err;
	}
	if (driver->write_ptr_2 == NULL) {
		driver->write_ptr_2 = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->write_ptr_2 == NULL)
			goto err;
	}
	if (driver->write_ptr_qdsp_1 == NULL) {
		driver->write_ptr_qdsp_1 = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->write_ptr_qdsp_1 == NULL)
			goto err;
	}
	if (driver->write_ptr_qdsp_2 == NULL) {
		driver->write_ptr_qdsp_2 = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->write_ptr_qdsp_2 == NULL)
			goto err;
	}
	if (driver->write_ptr_wcnss == NULL) {
		driver->write_ptr_wcnss = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->write_ptr_wcnss == NULL)
			goto err;
	}
	if (driver->usb_read_ptr == NULL) {
		driver->usb_read_ptr = kzalloc(
			sizeof(struct diag_request), GFP_KERNEL);
		if (driver->usb_read_ptr == NULL)
			goto err;
	}
	if (driver->pkt_buf == NULL &&
	     (driver->pkt_buf = kzalloc(PKT_SIZE,
			 GFP_KERNEL)) == NULL)
		goto err;
	if (driver->apps_rsp_buf == NULL) {
		driver->apps_rsp_buf = kzalloc(APPS_BUF_SIZE, GFP_KERNEL);
		if (driver->apps_rsp_buf == NULL)
			goto err;
	}
	driver->diag_wq = create_singlethread_workqueue("diag_wq");
#ifdef CONFIG_DIAG_OVER_USB
	INIT_WORK(&(driver->diag_proc_hdlc_work), diag_process_hdlc_fn);
	INIT_WORK(&(driver->diag_read_work), diag_read_work_fn);
	INIT_WORK(&(driver->diag_msg_mask_update_work),
						 diag_msg_mask_update_fn);
	INIT_WORK(&(driver->diag_log_mask_update_work),
						 diag_log_mask_update_fn);
	INIT_WORK(&(driver->diag_modem_mask_update_work),
						 diag_modem_mask_update_fn);
	INIT_WORK(&(driver->diag_qdsp_mask_update_work),
						 diag_qdsp_mask_update_fn);
	INIT_WORK(&(driver->diag_wcnss_mask_update_work),
						 diag_wcnss_mask_update_fn);
	driver->legacy_ch = usb_diag_open(DIAG_LEGACY, driver,
			diag_usb_legacy_notifier);
	if (IS_ERR(driver->legacy_ch)) {
		printk(KERN_ERR "Unable to open USB diag legacy channel\n");
		goto err;
	}
#endif
	platform_driver_register(&msm_smd_ch1_driver);
	platform_driver_register(&diag_smd_lite_driver);

	return;
err:
		pr_err("diag: Could not initialize diag buffers");
		kfree(driver->event_mask);
		kfree(driver->log_mask);
		kfree(driver->msg_mask);
		kfree(driver->buf_in_1);
		kfree(driver->buf_in_2);
		kfree(driver->buf_in_qdsp_1);
		kfree(driver->buf_in_qdsp_2);
		kfree(driver->buf_in_wcnss);
		kfree(driver->buf_msg_mask_update);
		kfree(driver->buf_log_mask_update);
		kfree(driver->buf_event_mask_update);
		kfree(driver->usb_buf_out);
		kfree(driver->hdlc_buf);
		kfree(driver->msg_masks);
		kfree(driver->log_masks);
		kfree(driver->event_masks);
		kfree(driver->client_map);
		kfree(driver->buf_tbl);
		kfree(driver->data_ready);
		kfree(driver->table);
		kfree(driver->pkt_buf);
		kfree(driver->write_ptr_1);
		kfree(driver->write_ptr_2);
		kfree(driver->write_ptr_qdsp_1);
		kfree(driver->write_ptr_qdsp_2);
		kfree(driver->write_ptr_wcnss);
		kfree(driver->usb_read_ptr);
		kfree(driver->apps_rsp_buf);
		kfree(driver->user_space_data);
		if (driver->diag_wq)
			destroy_workqueue(driver->diag_wq);
}

void diagfwd_exit(void)
{
	smd_close(driver->ch);
	smd_close(driver->chqdsp);
	smd_close(driver->ch_wcnss);
	driver->ch = 0;		/* SMD can make this NULL */
	driver->chqdsp = 0;
	driver->ch_wcnss = 0;
#ifdef CONFIG_DIAG_OVER_USB
	if (driver->usb_connected)
		usb_diag_free_req(driver->legacy_ch);
	usb_diag_close(driver->legacy_ch);
#endif
	platform_driver_unregister(&msm_smd_ch1_driver);
	platform_driver_unregister(&diag_smd_lite_driver);
	kfree(driver->event_mask);
	kfree(driver->log_mask);
	kfree(driver->msg_mask);
	kfree(driver->buf_in_1);
	kfree(driver->buf_in_2);
	kfree(driver->buf_in_qdsp_1);
	kfree(driver->buf_in_qdsp_2);
	kfree(driver->buf_in_wcnss);
	kfree(driver->buf_msg_mask_update);
	kfree(driver->buf_log_mask_update);
	kfree(driver->buf_event_mask_update);
	kfree(driver->usb_buf_out);
	kfree(driver->hdlc_buf);
	kfree(driver->msg_masks);
	kfree(driver->log_masks);
	kfree(driver->event_masks);
	kfree(driver->client_map);
	kfree(driver->buf_tbl);
	kfree(driver->data_ready);
	kfree(driver->table);
	kfree(driver->pkt_buf);
	kfree(driver->write_ptr_1);
	kfree(driver->write_ptr_2);
	kfree(driver->write_ptr_qdsp_1);
	kfree(driver->write_ptr_qdsp_2);
	kfree(driver->write_ptr_wcnss);
	kfree(driver->usb_read_ptr);
	kfree(driver->apps_rsp_buf);
	kfree(driver->user_space_data);
	destroy_workqueue(driver->diag_wq);
}