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https://mirrors.bfsu.edu.cn/git/linux.git
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77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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static int do_mod_firmware_load(const char *fn, char **fp)
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{
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struct file* filp;
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long l;
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char *dp;
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loff_t pos;
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filp = filp_open(fn, 0, 0);
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if (IS_ERR(filp))
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{
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printk(KERN_INFO "Unable to load '%s'.\n", fn);
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return 0;
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}
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l = filp->f_dentry->d_inode->i_size;
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if (l <= 0 || l > 131072)
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{
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printk(KERN_INFO "Invalid firmware '%s'\n", fn);
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filp_close(filp, current->files);
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return 0;
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}
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dp = vmalloc(l);
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if (dp == NULL)
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{
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printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
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filp_close(filp, current->files);
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return 0;
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}
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pos = 0;
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if (vfs_read(filp, dp, l, &pos) != l)
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{
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printk(KERN_INFO "Failed to read '%s'.\n", fn);
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vfree(dp);
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filp_close(filp, current->files);
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return 0;
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}
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filp_close(filp, current->files);
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*fp = dp;
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return (int) l;
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}
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/**
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* mod_firmware_load - load sound driver firmware
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* @fn: filename
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* @fp: return for the buffer.
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*
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* Load the firmware for a sound module (up to 128K) into a buffer.
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* The buffer is returned in *fp. It is allocated with vmalloc so is
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* virtually linear and not DMAable. The caller should free it with
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* vfree when finished.
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*
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* The length of the buffer is returned on a successful load, the
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* value zero on a failure.
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*
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* Caution: This API is not recommended. Firmware should be loaded via
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* an ioctl call and a setup application. This function may disappear
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* in future.
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*/
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int mod_firmware_load(const char *fn, char **fp)
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{
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int r;
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mm_segment_t fs = get_fs();
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set_fs(get_ds());
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r = do_mod_firmware_load(fn, fp);
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set_fs(fs);
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return r;
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}
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