[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / sound_firmware.c

#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include "oss/sound_firmware.h"

static int do_mod_firmware_load(const char *fn, char **fp)
{
	struct file* filp;
	long l;
	char *dp;
	loff_t pos;

	filp = filp_open(fn, 0, 0);
	if (IS_ERR(filp))
	{
		printk(KERN_INFO "Unable to load '%s'.\n", fn);
		return 0;
	}
	l = i_size_read(file_inode(filp));
	if (l <= 0 || l > 131072)
	{
		printk(KERN_INFO "Invalid firmware '%s'\n", fn);
		fput(filp);
		return 0;
	}
	dp = vmalloc(l);
	if (dp == NULL)
	{
		printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
		fput(filp);
		return 0;
	}
	pos = 0;
	if (vfs_read(filp, dp, l, &pos) != l)
	{
		printk(KERN_INFO "Failed to read '%s'.\n", fn);
		vfree(dp);
		fput(filp);
		return 0;
	}
	fput(filp);
	*fp = dp;
	return (int) l;
}

/**
 *	mod_firmware_load - load sound driver firmware
 *	@fn: filename
 *	@fp: return for the buffer.
 *
 *	Load the firmware for a sound module (up to 128K) into a buffer.
 *	The buffer is returned in *fp. It is allocated with vmalloc so is
 *	virtually linear and not DMAable. The caller should free it with
 *	vfree when finished.
 *
 *	The length of the buffer is returned on a successful load, the
 *	value zero on a failure.
 *
 *	Caution: This API is not recommended. Firmware should be loaded via
 *	request_firmware.
 */
 
int mod_firmware_load(const char *fn, char **fp)
{
	int r;
	mm_segment_t fs = get_fs();

	set_fs(get_ds());
	r = do_mod_firmware_load(fn, fp);
	set_fs(fs);
	return r;
}
EXPORT_SYMBOL(mod_firmware_load);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	#include <linux/vmalloc.h>
	2	#include <linux/module.h>
	3	#include <linux/fs.h>
434b5a2e	4	#include <linux/file.h>
1da177e4	5	#include <linux/mm.h>
e8edc6e0	6	#include <linux/sched.h>
1da177e4	7	#include <asm/uaccess.h>
b9dd6ffc	8	#include "oss/sound_firmware.h"
1da177e4 LT	9
	10	static int do_mod_firmware_load(const char fn, char *fp)
	11	{
	12	struct file* filp;
	13	long l;
	14	char *dp;
	15	loff_t pos;
	16
	17	filp = filp_open(fn, 0, 0);
	18	if (IS_ERR(filp))
	19	{
	20	printk(KERN_INFO "Unable to load '%s'.\n", fn);
	21	return 0;
	22	}
496ad9aa	23	l = i_size_read(file_inode(filp));
1da177e4 LT	24	if (l <= 0 \|\| l > 131072)
	25	{
	26	printk(KERN_INFO "Invalid firmware '%s'\n", fn);
434b5a2e	27	fput(filp);
1da177e4 LT	28	return 0;
	29	}
	30	dp = vmalloc(l);
	31	if (dp == NULL)
	32	{
	33	printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
434b5a2e	34	fput(filp);
1da177e4 LT	35	return 0;
	36	}
	37	pos = 0;
	38	if (vfs_read(filp, dp, l, &pos) != l)
	39	{
	40	printk(KERN_INFO "Failed to read '%s'.\n", fn);
	41	vfree(dp);
434b5a2e	42	fput(filp);
1da177e4 LT	43	return 0;
1da177e4 LT	44	}
434b5a2e	45	fput(filp);
1da177e4 LT	46	*fp = dp;
	47	return (int) l;
	48	}
	49
	50	/**
	51	* mod_firmware_load - load sound driver firmware
	52	* @fn: filename
	53	* @fp: return for the buffer.
	54	*
	55	* Load the firmware for a sound module (up to 128K) into a buffer.
	56	* The buffer is returned in *fp. It is allocated with vmalloc so is
	57	* virtually linear and not DMAable. The caller should free it with
	58	* vfree when finished.
	59	*
	60	* The length of the buffer is returned on a successful load, the
	61	* value zero on a failure.
	62	*
	63	* Caution: This API is not recommended. Firmware should be loaded via
b9dd6ffc	64	* request_firmware.
1da177e4 LT	65	*/
	66
	67	int mod_firmware_load(const char fn, char *fp)
	68	{
	69	int r;
	70	mm_segment_t fs = get_fs();
	71
	72	set_fs(get_ds());
	73	r = do_mod_firmware_load(fn, fp);
	74	set_fs(fs);
	75	return r;
	76	}
b9dd6ffc	77	EXPORT_SYMBOL(mod_firmware_load);
1da177e4	78
b9dd6ffc	79	MODULE_LICENSE("GPL");