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#
# Makefile for some libs needed in the kernel.
#

ifdef CONFIG_FUNCTION_TRACER
ORIG_CFLAGS := $(KBUILD_CFLAGS)
KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
endif

lib-y := ctype.o string.o vsprintf.o cmdline.o \
	 rbtree.o radix-tree.o dump_stack.o timerqueue.o\
	 idr.o int_sqrt.o extable.o prio_tree.o \
	 sha1.o irq_regs.o reciprocal_div.o argv_split.o \
	 proportions.o prio_heap.o ratelimit.o show_mem.o \
	 is_single_threaded.o plist.o decompress.o

lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o

lib-y	+= kobject.o kref.o klist.o

obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
	 string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o

ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
CFLAGS_kobject_uevent.o += -DDEBUG
endif

lib-$(CONFIG_HOTPLUG) += kobject_uevent.o
obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
lib-$(CONFIG_GENERIC_FIND_FIRST_BIT) += find_next_bit.o
lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
obj-$(CONFIG_GENERIC_FIND_LAST_BIT) += find_last_bit.o

CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS))
obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o

obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o
obj-$(CONFIG_BTREE) += btree.o
obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
obj-$(CONFIG_DEBUG_LIST) += list_debug.o
obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o

ifneq ($(CONFIG_HAVE_DEC_LOCK),y)
  lib-y += dec_and_lock.o
endif

obj-$(CONFIG_BITREVERSE) += bitrev.o
obj-$(CONFIG_RATIONAL)	+= rational.o
obj-$(CONFIG_CRC_CCITT)	+= crc-ccitt.o
obj-$(CONFIG_CRC16)	+= crc16.o
obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o
obj-$(CONFIG_CRC_ITU_T)	+= crc-itu-t.o
obj-$(CONFIG_CRC32)	+= crc32.o
obj-$(CONFIG_CRC7)	+= crc7.o
obj-$(CONFIG_LIBCRC32C)	+= libcrc32c.o
obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o

obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/
obj-$(CONFIG_REED_SOLOMON) += reed_solomon/
obj-$(CONFIG_LZO_COMPRESS) += lzo/
obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
obj-$(CONFIG_XZ_DEC) += xz/
obj-$(CONFIG_RAID6_PQ) += raid6/

lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o

obj-$(CONFIG_TEXTSEARCH) += textsearch.o
obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o
obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
obj-$(CONFIG_SMP) += percpu_counter.o
obj-$(CONFIG_AUDIT_GENERIC) += audit.o

obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o

lib-$(CONFIG_GENERIC_BUG) += bug.o

obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o

obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o

obj-$(CONFIG_NLATTR) += nlattr.o

obj-$(CONFIG_LRU_CACHE) += lru_cache.o

obj-$(CONFIG_DMA_API_DEBUG) += dma-debug.o

obj-$(CONFIG_GENERIC_CSUM) += checksum.o

obj-$(CONFIG_GENERIC_ATOMIC64) += atomic64.o

obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o

obj-$(CONFIG_AVERAGE) += average.o

hostprogs-y	:= gen_crc32table
clean-files	:= crc32table.h

$(obj)/crc32.o: $(obj)/crc32table.h

quiet_cmd_crc32 = GEN     $@
      cmd_crc32 = $< > $@

$(obj)/crc32table.h: $(obj)/gen_crc32table
	$(call cmd,crc32)
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/*
   em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@infradead.org>
		      Sascha Sommer <saschasommer@freenet.de>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>

#include "em28xx.h"

/* #define ENABLE_DEBUG_ISOC_FRAMES */

static unsigned int core_debug = 0;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");

#define em28xx_coredbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __FUNCTION__ , ##arg); } while (0)

static unsigned int reg_debug = 0;
module_param(reg_debug,int,0644);
MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");

#define em28xx_regdbg(fmt, arg...) do {\
	if (reg_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __FUNCTION__ , ##arg); } while (0)

static unsigned int isoc_debug = 0;
module_param(isoc_debug,int,0644);
MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");

#define em28xx_isocdbg(fmt, arg...) do {\
	if (isoc_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __FUNCTION__ , ##arg); } while (0)

static int alt = EM28XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");


/*
 * em28xx_request_buffers()
 * allocate a number of buffers
 */
u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
{
	const size_t imagesize = PAGE_ALIGN(dev->frame_size);	/*needs to be page aligned cause the buffers can be mapped individually! */
	void *buff = NULL;
	u32 i;
	em28xx_coredbg("requested %i buffers with size %zi", count, imagesize);
	if (count > EM28XX_NUM_FRAMES)
		count = EM28XX_NUM_FRAMES;

	dev->num_frames = count;
	while (dev->num_frames > 0) {
		if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
			memset(buff, 0, dev->num_frames * imagesize);
			break;
		}
		dev->num_frames--;
	}

	for (i = 0; i < dev->num_frames; i++) {
		dev->frame[i].bufmem = buff + i * imagesize;
		dev->frame[i].buf.index = i;
		dev->frame[i].buf.m.offset = i * imagesize;
		dev->frame[i].buf.length = dev->frame_size;
		dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		dev->frame[i].buf.sequence = 0;
		dev->frame[i].buf.field = V4L2_FIELD_NONE;
		dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
		dev->frame[i].buf.flags = 0;
	}
	return dev->num_frames;
}

/*
 * em28xx_queue_unusedframes()
 * add all frames that are not currently in use to the inbuffer queue
 */
void em28xx_queue_unusedframes(struct em28xx *dev)
{
	unsigned long lock_flags;
	u32 i;

	for (i = 0; i < dev->num_frames; i++)
		if (dev->frame[i].state == F_UNUSED) {
			dev->frame[i].state = F_QUEUED;
			spin_lock_irqsave(&dev->queue_lock, lock_flags);
			list_add_tail(&dev->frame[i].frame, &dev->inqueue);
			spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
		}
}

/*
 * em28xx_release_buffers()
 * free frame buffers
 */
void em28xx_release_buffers(struct em28xx *dev)
{
	if (dev->num_frames) {
		vfree(dev->frame[0].bufmem);
		dev->num_frames = 0;
	}
}

/*
 * em28xx_read_reg_req()
 * reads data from the usb device specifying bRequest
 */
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
				   char *buf, int len)
{
	int ret, byte;

	if (dev->state & DEV_DISCONNECTED)
		return(-ENODEV);

	em28xx_regdbg("req=%02x, reg=%02x ", req, reg);

	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      0x0000, reg, buf, len, HZ);

	if (reg_debug){
		printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
		for (byte = 0; byte < len; byte++) {
			printk(" %02x", buf[byte]);
		}
		printk("\n");
	}

	return ret;
}

/*
 * em28xx_read_reg_req()
 * reads data from the usb device specifying bRequest
 */
int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
{
	u8 val;
	int ret;

	if (dev->state & DEV_DISCONNECTED)
		return(-ENODEV);

	em28xx_regdbg("req=%02x, reg=%02x:", req, reg);

	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      0x0000, reg, &val, 1, HZ);

	if (reg_debug)
		printk(ret < 0 ? " failed!\n" : "%02x\n", val);

	if (ret < 0)
		return ret;

	return val;
}

int em28xx_read_reg(struct em28xx *dev, u16 reg)
{
	return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
}

/*
 * em28xx_write_regs_req()
 * sends data to the usb device, specifying bRequest
 */
int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
				 int len)
{
	int ret;

	/*usb_control_msg seems to expect a kmalloced buffer */
	unsigned char *bufs;

	if (dev->state & DEV_DISCONNECTED)
		return(-ENODEV);

	bufs = kmalloc(len, GFP_KERNEL);

	em28xx_regdbg("req=%02x reg=%02x:", req, reg);

	if (reg_debug) {
		int i;
		for (i = 0; i < len; ++i)
			printk (" %02x", (unsigned char)buf[i]);
		printk ("\n");
	}

	if (!bufs)
		return -ENOMEM;
	memcpy(bufs, buf, len);
	ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      0x0000, reg, bufs, len, HZ);
	msleep(5);		/* FIXME: magic number */
	kfree(bufs);
	return ret;
}

int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
{
	return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
}

/*
 * em28xx_write_reg_bits()
 * sets only some bits (specified by bitmask) of a register, by first reading
 * the actual value
 */
int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
				 u8 bitmask)
{
	int oldval;
	u8 newval;
	if ((oldval = em28xx_read_reg(dev, reg)) < 0)
		return oldval;
	newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
	return em28xx_write_regs(dev, reg, &newval, 1);
}

/*
 * em28xx_write_ac97()
 * write a 16 bit value to the specified AC97 address (LSB first!)
 */
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val)
{
	int ret;
	u8 addr = reg & 0x7f;
	if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
		return ret;
	if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
		return ret;
	if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
		return ret;
	else if (((u8) ret) & 0x01) {
		em28xx_warn ("AC97 command still being executed: not handled properly!\n");
	}
	return 0;
}