1 |
1275 |
phoenix |
/*
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2 |
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* The DSP56001 Device Driver, saviour of the Free World(tm)
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3 |
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*
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4 |
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* Authors: Fredrik Noring <noring@nocrew.org>
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5 |
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* lars brinkhoff <lars@nocrew.org>
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* Tomas Berndtsson <tomas@nocrew.org>
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7 |
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*
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* First version May 1996
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*
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* History:
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* 97-01-29 Tomas Berndtsson,
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* Integrated with Linux 2.1.21 kernel sources.
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* 97-02-15 Tomas Berndtsson,
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* Fixed for kernel 2.1.26
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*
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* BUGS:
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* Hmm... there must be something here :)
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*
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* Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/slab.h> /* for kmalloc() and kfree() */
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#include <linux/sched.h> /* for struct wait_queue etc */
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#include <linux/major.h>
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#include <linux/types.h>
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32 |
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#include <linux/errno.h>
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#include <linux/delay.h> /* guess what */
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/smp_lock.h>
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#include <asm/segment.h>
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#include <asm/atarihw.h>
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#include <asm/traps.h>
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#include <asm/uaccess.h> /* For put_user and get_user */
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#include <asm/dsp56k.h>
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/* minor devices */
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#define DSP56K_DEV_56001 0 /* The only device so far */
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50 |
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#define TIMEOUT 10 /* Host port timeout in number of tries */
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#define MAXIO 2048 /* Maximum number of words before sleep */
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#define DSP56K_MAX_BINARY_LENGTH (3*64*1024)
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#define DSP56K_TX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_TREQ
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#define DSP56K_RX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_RREQ
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#define DSP56K_TX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
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#define DSP56K_RX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ
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#define DSP56K_TRANSMIT (dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
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#define DSP56K_RECEIVE (dsp56k_host_interface.isr & DSP56K_ISR_RXDF)
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#define wait_some(n) \
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{ \
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set_current_state(TASK_INTERRUPTIBLE); \
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schedule_timeout(n); \
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}
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#define handshake(count, maxio, timeout, ENABLE, f) \
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{ \
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long i, t, m; \
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while (count > 0) { \
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m = min_t(unsigned long, count, maxio); \
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for (i = 0; i < m; i++) { \
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for (t = 0; t < timeout && !ENABLE; t++) \
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wait_some(HZ/50); \
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if(!ENABLE) \
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return -EIO; \
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f; \
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} \
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count -= m; \
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if (m == maxio) wait_some(HZ/50); \
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} \
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}
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#define tx_wait(n) \
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{ \
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int t; \
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for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
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wait_some(HZ/100); \
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if(!DSP56K_TRANSMIT) { \
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return -EIO; \
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} \
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}
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#define rx_wait(n) \
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{ \
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int t; \
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for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
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wait_some(HZ/100); \
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if(!DSP56K_RECEIVE) { \
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return -EIO; \
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} \
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}
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/* DSP56001 bootstrap code */
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static char bootstrap[] = {
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0x0c, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x60, 0xf4, 0x00, 0x00, 0x00, 0x4f, 0x61, 0xf4,
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127 |
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0x00, 0x00, 0x7e, 0xa9, 0x06, 0x2e, 0x80, 0x00, 0x00, 0x47,
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0x07, 0xd8, 0x84, 0x07, 0x59, 0x84, 0x08, 0xf4, 0xa8, 0x00,
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0x00, 0x04, 0x08, 0xf4, 0xbf, 0x00, 0x0c, 0x00, 0x00, 0xfe,
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0xb8, 0x0a, 0xf0, 0x80, 0x00, 0x7e, 0xa9, 0x08, 0xf4, 0xa0,
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0x00, 0x00, 0x01, 0x08, 0xf4, 0xbe, 0x00, 0x00, 0x00, 0x0a,
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0xa9, 0x80, 0x00, 0x7e, 0xad, 0x08, 0x4e, 0x2b, 0x44, 0xf4,
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0x00, 0x00, 0x00, 0x03, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x01,
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0x0e, 0xa0, 0x00, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb5, 0x08,
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135 |
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0x50, 0x2b, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb8, 0x08, 0x46,
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0x2b, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x02, 0x0a, 0xf0, 0xaa,
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0x00, 0x7e, 0xc9, 0x20, 0x00, 0x45, 0x0a, 0xf0, 0xaa, 0x00,
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0x7e, 0xd0, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xc6, 0x0a, 0xa9,
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0x80, 0x00, 0x7e, 0xc4, 0x08, 0x58, 0x6b, 0x0a, 0xf0, 0x80,
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0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xcd, 0x0a,
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0xa9, 0x80, 0x00, 0x7e, 0xcb, 0x08, 0x58, 0xab, 0x0a, 0xf0,
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0x80, 0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xd4,
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0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xd2, 0x08, 0x58, 0xeb, 0x0a,
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0xf0, 0x80, 0x00, 0x7e, 0xad};
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static int sizeof_bootstrap = 375;
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147 |
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148 |
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static struct dsp56k_device {
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149 |
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long in_use;
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150 |
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long maxio, timeout;
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151 |
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int tx_wsize, rx_wsize;
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152 |
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} dsp56k;
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153 |
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154 |
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static int dsp56k_reset(void)
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{
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156 |
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u_char status;
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157 |
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158 |
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/* Power down the DSP */
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159 |
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sound_ym.rd_data_reg_sel = 14;
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160 |
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status = sound_ym.rd_data_reg_sel & 0xef;
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161 |
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sound_ym.wd_data = status;
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162 |
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sound_ym.wd_data = status | 0x10;
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163 |
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164 |
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udelay(10);
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165 |
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166 |
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/* Power up the DSP */
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167 |
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sound_ym.rd_data_reg_sel = 14;
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sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;
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170 |
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return 0;
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171 |
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}
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172 |
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173 |
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static int dsp56k_upload(u_char *bin, int len)
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174 |
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{
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175 |
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int i;
|
176 |
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u_char *p;
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177 |
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178 |
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dsp56k_reset();
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179 |
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180 |
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p = bootstrap;
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181 |
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for (i = 0; i < sizeof_bootstrap/3; i++) {
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182 |
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/* tx_wait(10); */
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183 |
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dsp56k_host_interface.data.b[1] = *p++;
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184 |
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dsp56k_host_interface.data.b[2] = *p++;
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185 |
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dsp56k_host_interface.data.b[3] = *p++;
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186 |
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}
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187 |
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for (; i < 512; i++) {
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188 |
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/* tx_wait(10); */
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189 |
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dsp56k_host_interface.data.b[1] = 0;
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190 |
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dsp56k_host_interface.data.b[2] = 0;
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191 |
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dsp56k_host_interface.data.b[3] = 0;
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192 |
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}
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193 |
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194 |
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for (i = 0; i < len; i++) {
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195 |
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tx_wait(10);
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196 |
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get_user(dsp56k_host_interface.data.b[1], bin++);
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197 |
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get_user(dsp56k_host_interface.data.b[2], bin++);
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198 |
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get_user(dsp56k_host_interface.data.b[3], bin++);
|
199 |
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}
|
200 |
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201 |
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tx_wait(10);
|
202 |
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dsp56k_host_interface.data.l = 3; /* Magic execute */
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203 |
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|
204 |
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return 0;
|
205 |
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}
|
206 |
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|
207 |
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static ssize_t dsp56k_read(struct file *file, char *buf, size_t count,
|
208 |
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loff_t *ppos)
|
209 |
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{
|
210 |
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struct inode *inode = file->f_dentry->d_inode;
|
211 |
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int dev = MINOR(inode->i_rdev) & 0x0f;
|
212 |
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|
213 |
|
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switch(dev)
|
214 |
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{
|
215 |
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case DSP56K_DEV_56001:
|
216 |
|
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{
|
217 |
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|
218 |
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long n;
|
219 |
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|
220 |
|
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/* Don't do anything if nothing is to be done */
|
221 |
|
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if (!count) return 0;
|
222 |
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|
223 |
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n = 0;
|
224 |
|
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switch (dsp56k.rx_wsize) {
|
225 |
|
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case 1: /* 8 bit */
|
226 |
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{
|
227 |
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
|
228 |
|
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put_user(dsp56k_host_interface.data.b[3], buf+n++));
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229 |
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return n;
|
230 |
|
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}
|
231 |
|
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case 2: /* 16 bit */
|
232 |
|
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{
|
233 |
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short *data;
|
234 |
|
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|
235 |
|
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count /= 2;
|
236 |
|
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data = (short*) buf;
|
237 |
|
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
|
238 |
|
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put_user(dsp56k_host_interface.data.w[1], data+n++));
|
239 |
|
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return 2*n;
|
240 |
|
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}
|
241 |
|
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case 3: /* 24 bit */
|
242 |
|
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{
|
243 |
|
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count /= 3;
|
244 |
|
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
|
245 |
|
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put_user(dsp56k_host_interface.data.b[1], buf+n++);
|
246 |
|
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put_user(dsp56k_host_interface.data.b[2], buf+n++);
|
247 |
|
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put_user(dsp56k_host_interface.data.b[3], buf+n++));
|
248 |
|
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return 3*n;
|
249 |
|
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}
|
250 |
|
|
case 4: /* 32 bit */
|
251 |
|
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{
|
252 |
|
|
long *data;
|
253 |
|
|
|
254 |
|
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count /= 4;
|
255 |
|
|
data = (long*) buf;
|
256 |
|
|
handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
|
257 |
|
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put_user(dsp56k_host_interface.data.l, data+n++));
|
258 |
|
|
return 4*n;
|
259 |
|
|
}
|
260 |
|
|
}
|
261 |
|
|
return -EFAULT;
|
262 |
|
|
}
|
263 |
|
|
|
264 |
|
|
default:
|
265 |
|
|
printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
|
266 |
|
|
return -ENXIO;
|
267 |
|
|
}
|
268 |
|
|
}
|
269 |
|
|
|
270 |
|
|
static ssize_t dsp56k_write(struct file *file, const char *buf, size_t count,
|
271 |
|
|
loff_t *ppos)
|
272 |
|
|
{
|
273 |
|
|
struct inode *inode = file->f_dentry->d_inode;
|
274 |
|
|
int dev = MINOR(inode->i_rdev) & 0x0f;
|
275 |
|
|
|
276 |
|
|
switch(dev)
|
277 |
|
|
{
|
278 |
|
|
case DSP56K_DEV_56001:
|
279 |
|
|
{
|
280 |
|
|
long n;
|
281 |
|
|
|
282 |
|
|
/* Don't do anything if nothing is to be done */
|
283 |
|
|
if (!count) return 0;
|
284 |
|
|
|
285 |
|
|
n = 0;
|
286 |
|
|
switch (dsp56k.tx_wsize) {
|
287 |
|
|
case 1: /* 8 bit */
|
288 |
|
|
{
|
289 |
|
|
handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
|
290 |
|
|
get_user(dsp56k_host_interface.data.b[3], buf+n++));
|
291 |
|
|
return n;
|
292 |
|
|
}
|
293 |
|
|
case 2: /* 16 bit */
|
294 |
|
|
{
|
295 |
|
|
short *data;
|
296 |
|
|
|
297 |
|
|
count /= 2;
|
298 |
|
|
data = (short*) buf;
|
299 |
|
|
handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
|
300 |
|
|
get_user(dsp56k_host_interface.data.w[1], data+n++));
|
301 |
|
|
return 2*n;
|
302 |
|
|
}
|
303 |
|
|
case 3: /* 24 bit */
|
304 |
|
|
{
|
305 |
|
|
count /= 3;
|
306 |
|
|
handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
|
307 |
|
|
get_user(dsp56k_host_interface.data.b[1], buf+n++);
|
308 |
|
|
get_user(dsp56k_host_interface.data.b[2], buf+n++);
|
309 |
|
|
get_user(dsp56k_host_interface.data.b[3], buf+n++));
|
310 |
|
|
return 3*n;
|
311 |
|
|
}
|
312 |
|
|
case 4: /* 32 bit */
|
313 |
|
|
{
|
314 |
|
|
long *data;
|
315 |
|
|
|
316 |
|
|
count /= 4;
|
317 |
|
|
data = (long*) buf;
|
318 |
|
|
handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
|
319 |
|
|
get_user(dsp56k_host_interface.data.l, data+n++));
|
320 |
|
|
return 4*n;
|
321 |
|
|
}
|
322 |
|
|
}
|
323 |
|
|
|
324 |
|
|
return -EFAULT;
|
325 |
|
|
}
|
326 |
|
|
default:
|
327 |
|
|
printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
|
328 |
|
|
return -ENXIO;
|
329 |
|
|
}
|
330 |
|
|
}
|
331 |
|
|
|
332 |
|
|
static int dsp56k_ioctl(struct inode *inode, struct file *file,
|
333 |
|
|
unsigned int cmd, unsigned long arg)
|
334 |
|
|
{
|
335 |
|
|
int dev = MINOR(inode->i_rdev) & 0x0f;
|
336 |
|
|
|
337 |
|
|
switch(dev)
|
338 |
|
|
{
|
339 |
|
|
case DSP56K_DEV_56001:
|
340 |
|
|
|
341 |
|
|
switch(cmd) {
|
342 |
|
|
case DSP56K_UPLOAD:
|
343 |
|
|
{
|
344 |
|
|
char *bin;
|
345 |
|
|
int r, len;
|
346 |
|
|
struct dsp56k_upload *binary = (struct dsp56k_upload *) arg;
|
347 |
|
|
|
348 |
|
|
if(get_user(len, &binary->len) < 0)
|
349 |
|
|
return -EFAULT;
|
350 |
|
|
if(get_user(bin, &binary->bin) < 0)
|
351 |
|
|
return -EFAULT;
|
352 |
|
|
|
353 |
|
|
if (len == 0) {
|
354 |
|
|
return -EINVAL; /* nothing to upload?!? */
|
355 |
|
|
}
|
356 |
|
|
if (len > DSP56K_MAX_BINARY_LENGTH) {
|
357 |
|
|
return -EINVAL;
|
358 |
|
|
}
|
359 |
|
|
|
360 |
|
|
r = dsp56k_upload(bin, len);
|
361 |
|
|
if (r < 0) {
|
362 |
|
|
return r;
|
363 |
|
|
}
|
364 |
|
|
|
365 |
|
|
break;
|
366 |
|
|
}
|
367 |
|
|
case DSP56K_SET_TX_WSIZE:
|
368 |
|
|
if (arg > 4 || arg < 1)
|
369 |
|
|
return -EINVAL;
|
370 |
|
|
dsp56k.tx_wsize = (int) arg;
|
371 |
|
|
break;
|
372 |
|
|
case DSP56K_SET_RX_WSIZE:
|
373 |
|
|
if (arg > 4 || arg < 1)
|
374 |
|
|
return -EINVAL;
|
375 |
|
|
dsp56k.rx_wsize = (int) arg;
|
376 |
|
|
break;
|
377 |
|
|
case DSP56K_HOST_FLAGS:
|
378 |
|
|
{
|
379 |
|
|
int dir, out, status;
|
380 |
|
|
struct dsp56k_host_flags *hf = (struct dsp56k_host_flags*) arg;
|
381 |
|
|
|
382 |
|
|
if(get_user(dir, &hf->dir) < 0)
|
383 |
|
|
return -EFAULT;
|
384 |
|
|
if(get_user(out, &hf->out) < 0)
|
385 |
|
|
return -EFAULT;
|
386 |
|
|
|
387 |
|
|
if ((dir & 0x1) && (out & 0x1))
|
388 |
|
|
dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
|
389 |
|
|
else if (dir & 0x1)
|
390 |
|
|
dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
|
391 |
|
|
if ((dir & 0x2) && (out & 0x2))
|
392 |
|
|
dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
|
393 |
|
|
else if (dir & 0x2)
|
394 |
|
|
dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
|
395 |
|
|
|
396 |
|
|
status = 0;
|
397 |
|
|
if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
|
398 |
|
|
if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
|
399 |
|
|
if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
|
400 |
|
|
if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
|
401 |
|
|
|
402 |
|
|
return put_user(status, &hf->status);
|
403 |
|
|
}
|
404 |
|
|
case DSP56K_HOST_CMD:
|
405 |
|
|
if (arg > 31 || arg < 0)
|
406 |
|
|
return -EINVAL;
|
407 |
|
|
dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
|
408 |
|
|
DSP56K_CVR_HC);
|
409 |
|
|
break;
|
410 |
|
|
default:
|
411 |
|
|
return -EINVAL;
|
412 |
|
|
}
|
413 |
|
|
return 0;
|
414 |
|
|
|
415 |
|
|
default:
|
416 |
|
|
printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
|
417 |
|
|
return -ENXIO;
|
418 |
|
|
}
|
419 |
|
|
}
|
420 |
|
|
|
421 |
|
|
/* As of 2.1.26 this should be dsp56k_poll,
|
422 |
|
|
* but how do I then check device minor number?
|
423 |
|
|
* Do I need this function at all???
|
424 |
|
|
*/
|
425 |
|
|
#if 0
|
426 |
|
|
static unsigned int dsp56k_poll(struct file *file, poll_table *wait)
|
427 |
|
|
{
|
428 |
|
|
int dev = MINOR(file->f_dentry->d_inode->i_rdev) & 0x0f;
|
429 |
|
|
|
430 |
|
|
switch(dev)
|
431 |
|
|
{
|
432 |
|
|
case DSP56K_DEV_56001:
|
433 |
|
|
/* poll_wait(file, ???, wait); */
|
434 |
|
|
return POLLIN | POLLRDNORM | POLLOUT;
|
435 |
|
|
|
436 |
|
|
default:
|
437 |
|
|
printk("DSP56k driver: Unknown minor device: %d\n", dev);
|
438 |
|
|
return 0;
|
439 |
|
|
}
|
440 |
|
|
}
|
441 |
|
|
#endif
|
442 |
|
|
|
443 |
|
|
static int dsp56k_open(struct inode *inode, struct file *file)
|
444 |
|
|
{
|
445 |
|
|
int dev = MINOR(inode->i_rdev) & 0x0f;
|
446 |
|
|
|
447 |
|
|
switch(dev)
|
448 |
|
|
{
|
449 |
|
|
case DSP56K_DEV_56001:
|
450 |
|
|
|
451 |
|
|
if (test_and_set_bit(0, &dsp56k.in_use))
|
452 |
|
|
return -EBUSY;
|
453 |
|
|
|
454 |
|
|
dsp56k.timeout = TIMEOUT;
|
455 |
|
|
dsp56k.maxio = MAXIO;
|
456 |
|
|
dsp56k.rx_wsize = dsp56k.tx_wsize = 4;
|
457 |
|
|
|
458 |
|
|
DSP56K_TX_INT_OFF;
|
459 |
|
|
DSP56K_RX_INT_OFF;
|
460 |
|
|
|
461 |
|
|
/* Zero host flags */
|
462 |
|
|
dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
|
463 |
|
|
dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
|
464 |
|
|
|
465 |
|
|
break;
|
466 |
|
|
|
467 |
|
|
default:
|
468 |
|
|
return -ENODEV;
|
469 |
|
|
}
|
470 |
|
|
|
471 |
|
|
return 0;
|
472 |
|
|
}
|
473 |
|
|
|
474 |
|
|
static int dsp56k_release(struct inode *inode, struct file *file)
|
475 |
|
|
{
|
476 |
|
|
int dev = MINOR(inode->i_rdev) & 0x0f;
|
477 |
|
|
|
478 |
|
|
switch(dev)
|
479 |
|
|
{
|
480 |
|
|
case DSP56K_DEV_56001:
|
481 |
|
|
clear_bit(0, &dsp56k.in_use);
|
482 |
|
|
break;
|
483 |
|
|
default:
|
484 |
|
|
printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
|
485 |
|
|
return -ENXIO;
|
486 |
|
|
}
|
487 |
|
|
|
488 |
|
|
return 0;
|
489 |
|
|
}
|
490 |
|
|
|
491 |
|
|
static struct file_operations dsp56k_fops = {
|
492 |
|
|
owner: THIS_MODULE,
|
493 |
|
|
read: dsp56k_read,
|
494 |
|
|
write: dsp56k_write,
|
495 |
|
|
ioctl: dsp56k_ioctl,
|
496 |
|
|
open: dsp56k_open,
|
497 |
|
|
release: dsp56k_release,
|
498 |
|
|
};
|
499 |
|
|
|
500 |
|
|
|
501 |
|
|
/****** Init and module functions ******/
|
502 |
|
|
|
503 |
|
|
static devfs_handle_t devfs_handle;
|
504 |
|
|
|
505 |
|
|
static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
|
506 |
|
|
|
507 |
|
|
static int __init dsp56k_init_driver(void)
|
508 |
|
|
{
|
509 |
|
|
if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
|
510 |
|
|
printk("DSP56k driver: Hardware not present\n");
|
511 |
|
|
return -ENODEV;
|
512 |
|
|
}
|
513 |
|
|
|
514 |
|
|
if(devfs_register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
|
515 |
|
|
printk("DSP56k driver: Unable to register driver\n");
|
516 |
|
|
return -ENODEV;
|
517 |
|
|
}
|
518 |
|
|
devfs_handle = devfs_register(NULL, "dsp56k", DEVFS_FL_DEFAULT,
|
519 |
|
|
DSP56K_MAJOR, 0,
|
520 |
|
|
S_IFCHR | S_IRUSR | S_IWUSR,
|
521 |
|
|
&dsp56k_fops, NULL);
|
522 |
|
|
|
523 |
|
|
printk(banner);
|
524 |
|
|
return 0;
|
525 |
|
|
}
|
526 |
|
|
module_init(dsp56k_init_driver);
|
527 |
|
|
|
528 |
|
|
static void __exit dsp56k_cleanup_driver(void)
|
529 |
|
|
{
|
530 |
|
|
devfs_unregister_chrdev(DSP56K_MAJOR, "dsp56k");
|
531 |
|
|
devfs_unregister(devfs_handle);
|
532 |
|
|
}
|
533 |
|
|
module_exit(dsp56k_cleanup_driver);
|
534 |
|
|
|
535 |
|
|
MODULE_LICENSE("GPL");
|