cregit-Linux how code gets into the kernel

Release 4.10 drivers/char/dsp56k.c

Directory: drivers/char
/*
 * The DSP56001 Device Driver, saviour of the Free World(tm)
 *
 * Authors: Fredrik Noring   <noring@nocrew.org>
 *          lars brinkhoff   <lars@nocrew.org>
 *          Tomas Berndtsson <tomas@nocrew.org>
 *
 * First version May 1996
 *
 * History:
 *  97-01-29   Tomas Berndtsson,
 *               Integrated with Linux 2.1.21 kernel sources.
 *  97-02-15   Tomas Berndtsson,
 *               Fixed for kernel 2.1.26
 *
 * BUGS:
 *  Hmm... there must be something here :)
 *
 * Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/major.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>	/* guess what */
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/firmware.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>	/* For put_user and get_user */

#include <asm/atarihw.h>
#include <asm/traps.h>

#include <asm/dsp56k.h>

/* minor devices */

#define DSP56K_DEV_56001        0    
/* The only device so far */


#define TIMEOUT    10   
/* Host port timeout in number of tries */

#define MAXIO    2048   
/* Maximum number of words before sleep */

#define DSP56K_MAX_BINARY_LENGTH (3*64*1024)


#define DSP56K_TX_INT_ON	dsp56k_host_interface.icr |=  DSP56K_ICR_TREQ

#define DSP56K_RX_INT_ON	dsp56k_host_interface.icr |=  DSP56K_ICR_RREQ

#define DSP56K_TX_INT_OFF	dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ

#define DSP56K_RX_INT_OFF	dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ


#define DSP56K_TRANSMIT		(dsp56k_host_interface.isr & DSP56K_ISR_TXDE)

#define DSP56K_RECEIVE		(dsp56k_host_interface.isr & DSP56K_ISR_RXDF)


#define handshake(count, maxio, timeout, ENABLE, f) \
{ \
        long i, t, m; \
        while (count > 0) { \
                m = min_t(unsigned long, count, maxio); \
                for (i = 0; i < m; i++) { \
                        for (t = 0; t < timeout && !ENABLE; t++) \
                                msleep(20); \
                        if(!ENABLE) \
                                return -EIO; \
                        f; \
                } \
                count -= m; \
                if (m == maxio) msleep(20); \
        } \
}


#define tx_wait(n) \
{ \
        int t; \
        for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
                msleep(10); \
        if(!DSP56K_TRANSMIT) { \
                return -EIO; \
        } \
}


#define rx_wait(n) \
{ \
        int t; \
        for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
                msleep(10); \
        if(!DSP56K_RECEIVE) { \
                return -EIO; \
        } \
}

static DEFINE_MUTEX(dsp56k_mutex);

static struct dsp56k_device {
	
unsigned long in_use;
	

long maxio, timeout;
	

int tx_wsize, rx_wsize;
} 
dsp56k;


static struct class *dsp56k_class;


static int dsp56k_reset(void) { u_char status; /* Power down the DSP */ sound_ym.rd_data_reg_sel = 14; status = sound_ym.rd_data_reg_sel & 0xef; sound_ym.wd_data = status; sound_ym.wd_data = status | 0x10; udelay(10); /* Power up the DSP */ sound_ym.rd_data_reg_sel = 14; sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef; return 0; }

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Total65100.00%1100.00%


static int dsp56k_upload(u_char __user *bin, int len) { struct platform_device *pdev; const struct firmware *fw; const char fw_name[] = "dsp56k/bootstrap.bin"; int err; int i; dsp56k_reset(); pdev = platform_device_register_simple("dsp56k", 0, NULL, 0); if (IS_ERR(pdev)) { printk(KERN_ERR "Failed to register device for \"%s\"\n", fw_name); return -EINVAL; } err = request_firmware(&fw, fw_name, &pdev->dev); platform_device_unregister(pdev); if (err) { printk(KERN_ERR "Failed to load image \"%s\" err %d\n", fw_name, err); return err; } if (fw->size % 3) { printk(KERN_ERR "Bogus length %d in image \"%s\"\n", fw->size, fw_name); release_firmware(fw); return -EINVAL; } for (i = 0; i < fw->size; i = i + 3) { /* tx_wait(10); */ dsp56k_host_interface.data.b[1] = fw->data[i]; dsp56k_host_interface.data.b[2] = fw->data[i + 1]; dsp56k_host_interface.data.b[3] = fw->data[i + 2]; } release_firmware(fw); for (; i < 512; i++) { /* tx_wait(10); */ dsp56k_host_interface.data.b[1] = 0; dsp56k_host_interface.data.b[2] = 0; dsp56k_host_interface.data.b[3] = 0; } for (i = 0; i < len; i++) { tx_wait(10); get_user(dsp56k_host_interface.data.b[1], bin++); get_user(dsp56k_host_interface.data.b[2], bin++); get_user(dsp56k_host_interface.data.b[3], bin++); } tx_wait(10); dsp56k_host_interface.data.l = 3; /* Magic execute */ return 0; }

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pre-gitpre-git19354.99%133.33%
jaswinder singh rajputjaswinder singh rajput15744.73%133.33%
al viroal viro10.28%133.33%
Total351100.00%3100.00%


static ssize_t dsp56k_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct inode *inode = file_inode(file); int dev = iminor(inode) & 0x0f; switch(dev) { case DSP56K_DEV_56001: { long n; /* Don't do anything if nothing is to be done */ if (!count) return 0; n = 0; switch (dsp56k.rx_wsize) { case 1: /* 8 bit */ { handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE, put_user(dsp56k_host_interface.data.b[3], buf+n++)); return n; } case 2: /* 16 bit */ { short __user *data; count /= 2; data = (short __user *) buf; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE, put_user(dsp56k_host_interface.data.w[1], data+n++)); return 2*n; } case 3: /* 24 bit */ { count /= 3; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE, put_user(dsp56k_host_interface.data.b[1], buf+n++); put_user(dsp56k_host_interface.data.b[2], buf+n++); put_user(dsp56k_host_interface.data.b[3], buf+n++)); return 3*n; } case 4: /* 32 bit */ { long __user *data; count /= 4; data = (long __user *) buf; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE, put_user(dsp56k_host_interface.data.l, data+n++)); return 4*n; } } return -EFAULT; } default: printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev); return -ENXIO; } }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git27996.54%233.33%
al viroal viro93.11%350.00%
linus torvaldslinus torvalds10.35%116.67%
Total289100.00%6100.00%


static ssize_t dsp56k_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct inode *inode = file_inode(file); int dev = iminor(inode) & 0x0f; switch(dev) { case DSP56K_DEV_56001: { long n; /* Don't do anything if nothing is to be done */ if (!count) return 0; n = 0; switch (dsp56k.tx_wsize) { case 1: /* 8 bit */ { handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT, get_user(dsp56k_host_interface.data.b[3], buf+n++)); return n; } case 2: /* 16 bit */ { const short __user *data; count /= 2; data = (const short __user *)buf; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT, get_user(dsp56k_host_interface.data.w[1], data+n++)); return 2*n; } case 3: /* 24 bit */ { count /= 3; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT, get_user(dsp56k_host_interface.data.b[1], buf+n++); get_user(dsp56k_host_interface.data.b[2], buf+n++); get_user(dsp56k_host_interface.data.b[3], buf+n++)); return 3*n; } case 4: /* 32 bit */ { const long __user *data; count /= 4; data = (const long __user *)buf; handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT, get_user(dsp56k_host_interface.data.l, data+n++)); return 4*n; } } return -EFAULT; } default: printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev); return -ENXIO; } }

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pre-gitpre-git28095.24%228.57%
al viroal viro93.06%342.86%
geert uytterhoevengeert uytterhoeven41.36%114.29%
linus torvaldslinus torvalds10.34%114.29%
Total294100.00%7100.00%


static long dsp56k_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int dev = iminor(file_inode(file)) & 0x0f; void __user *argp = (void __user *)arg; switch(dev) { case DSP56K_DEV_56001: switch(cmd) { case DSP56K_UPLOAD: { char __user *bin; int r, len; struct dsp56k_upload __user *binary = argp; if(get_user(len, &binary->len) < 0) return -EFAULT; if(get_user(bin, &binary->bin) < 0) return -EFAULT; if (len <= 0) { return -EINVAL; /* nothing to upload?!? */ } if (len > DSP56K_MAX_BINARY_LENGTH) { return -EINVAL; } mutex_lock(&dsp56k_mutex); r = dsp56k_upload(bin, len); mutex_unlock(&dsp56k_mutex); if (r < 0) { return r; } break; } case DSP56K_SET_TX_WSIZE: if (arg > 4 || arg < 1) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k.tx_wsize = (int) arg; mutex_unlock(&dsp56k_mutex); break; case DSP56K_SET_RX_WSIZE: if (arg > 4 || arg < 1) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k.rx_wsize = (int) arg; mutex_unlock(&dsp56k_mutex); break; case DSP56K_HOST_FLAGS: { int dir, out, status; struct dsp56k_host_flags __user *hf = argp; if(get_user(dir, &hf->dir) < 0) return -EFAULT; if(get_user(out, &hf->out) < 0) return -EFAULT; mutex_lock(&dsp56k_mutex); if ((dir & 0x1) && (out & 0x1)) dsp56k_host_interface.icr |= DSP56K_ICR_HF0; else if (dir & 0x1) dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0; if ((dir & 0x2) && (out & 0x2)) dsp56k_host_interface.icr |= DSP56K_ICR_HF1; else if (dir & 0x2) dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1; status = 0; if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1; if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2; if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4; if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8; mutex_unlock(&dsp56k_mutex); return put_user(status, &hf->status); } case DSP56K_HOST_CMD: if (arg > 31) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) | DSP56K_CVR_HC); mutex_unlock(&dsp56k_mutex); break; default: return -EINVAL; } return 0; default: printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev); return -ENXIO; } }

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pre-gitpre-git43283.56%220.00%
arnd bergmannarnd bergmann509.67%110.00%
al viroal viro214.06%330.00%
alan coxalan cox112.13%110.00%
dan carpenterdan carpenter10.19%110.00%
linus torvaldslinus torvalds10.19%110.00%
geert uytterhoevengeert uytterhoeven10.19%110.00%
Total517100.00%10100.00%

/* As of 2.1.26 this should be dsp56k_poll, * but how do I then check device minor number? * Do I need this function at all??? */ #if 0 static unsigned int dsp56k_poll(struct file *file, poll_table *wait) { int dev = iminor(file_inode(file)) & 0x0f; switch(dev) { case DSP56K_DEV_56001: /* poll_wait(file, ???, wait); */ return POLLIN | POLLRDNORM | POLLOUT; default: printk("DSP56k driver: Unknown minor device: %d\n", dev); return 0; } } #endif
static int dsp56k_open(struct inode *inode, struct file *file) { int dev = iminor(inode) & 0x0f; int ret = 0; mutex_lock(&dsp56k_mutex); switch(dev) { case DSP56K_DEV_56001: if (test_and_set_bit(0, &dsp56k.in_use)) { ret = -EBUSY; goto out; } dsp56k.timeout = TIMEOUT; dsp56k.maxio = MAXIO; dsp56k.rx_wsize = dsp56k.tx_wsize = 4; DSP56K_TX_INT_OFF; DSP56K_RX_INT_OFF; /* Zero host flags */ dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0; dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1; break; default: ret = -ENODEV; } out: mutex_unlock(&dsp56k_mutex); return ret; }

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pre-gitpre-git8869.29%120.00%
jonathan corbetjonathan corbet2116.54%120.00%
arnd bergmannarnd bergmann107.87%120.00%
linus torvaldslinus torvalds75.51%120.00%
al viroal viro10.79%120.00%
Total127100.00%5100.00%


static int dsp56k_release(struct inode *inode, struct file *file) { int dev = iminor(inode) & 0x0f; switch(dev) { case DSP56K_DEV_56001: clear_bit(0, &dsp56k.in_use); break; default: printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev); return -ENXIO; } return 0; }

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pre-gitpre-git5487.10%350.00%
linus torvaldslinus torvalds711.29%233.33%
al viroal viro11.61%116.67%
Total62100.00%6100.00%

static const struct file_operations dsp56k_fops = { .owner = THIS_MODULE, .read = dsp56k_read, .write = dsp56k_write, .unlocked_ioctl = dsp56k_ioctl, .open = dsp56k_open, .release = dsp56k_release, .llseek = noop_llseek, }; /****** Init and module functions ******/ static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
static int __init dsp56k_init_driver(void) { int err = 0; if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) { printk("DSP56k driver: Hardware not present\n"); return -ENODEV; } if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) { printk("DSP56k driver: Unable to register driver\n"); return -ENODEV; } dsp56k_class = class_create(THIS_MODULE, "dsp56k"); if (IS_ERR(dsp56k_class)) { err = PTR_ERR(dsp56k_class); goto out_chrdev; } device_create(dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL, "dsp56k"); printk(banner); goto out; out_chrdev: unregister_chrdev(DSP56K_MAJOR, "dsp56k"); out: return err; }

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hanna linderhanna linder6148.03%19.09%
pre-gitpre-git5644.09%436.36%
greg kroah-hartmangreg kroah-hartman75.51%545.45%
linus torvaldslinus torvalds32.36%19.09%
Total127100.00%11100.00%

module_init(dsp56k_init_driver);
static void __exit dsp56k_cleanup_driver(void) { device_destroy(dsp56k_class, MKDEV(DSP56K_MAJOR, 0)); class_destroy(dsp56k_class); unregister_chrdev(DSP56K_MAJOR, "dsp56k"); }

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hanna linderhanna linder1339.39%116.67%
pre-gitpre-git1236.36%116.67%
greg kroah-hartmangreg kroah-hartman412.12%233.33%
linus torvaldslinus torvalds39.09%116.67%
tony jonestony jones13.03%116.67%
Total33100.00%6100.00%

module_exit(dsp56k_cleanup_driver); MODULE_LICENSE("GPL"); MODULE_FIRMWARE("dsp56k/bootstrap.bin");

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pre-gitpre-git155073.56%1233.33%
jaswinder singh rajputjaswinder singh rajput24011.39%12.78%
hanna linderhanna linder823.89%12.78%
arnd bergmannarnd bergmann723.42%25.56%
linus torvaldslinus torvalds482.28%38.33%
al viroal viro442.09%411.11%
jonathan corbetjonathan corbet231.09%12.78%
alan coxalan cox160.76%12.78%
art haasart haas120.57%12.78%
greg kroah-hartmangreg kroah-hartman120.57%513.89%
geert uytterhoevengeert uytterhoeven50.24%25.56%
arjan van de venarjan van de ven10.05%12.78%
dan carpenterdan carpenter10.05%12.78%
tony jonestony jones10.05%12.78%
Total2107100.00%36100.00%
Directory: drivers/char
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