/* * linux/drivers/char/psaux.c * * Driver for PS/2 type mouse by Johan Myreen. * * Supports pointing devices attached to a PS/2 type * Keyboard and Auxiliary Device Controller. * * Corrections in device setup for some laptop mice & trackballs. * 02Feb93 (troyer@saifr00.cfsat.Honeywell.COM,mch@wimsey.bc.ca) * * Changed to prevent keyboard lockups on AST Power Exec. * 28Jul93 Brad Bosch - brad@lachman.com * * Modified by Johan Myreen (jem@pandora.pp.fi) 04Aug93 * to include support for QuickPort mouse. * * Changed references to "QuickPort" with "82C710" since "QuickPort" * is not what this driver is all about -- QuickPort is just a * connector type, and this driver is for the mouse port on the Chips * & Technologies 82C710 interface chip. 15Nov93 jem@pandora.pp.fi * * Added support for SIGIO. 28Jul95 jem@pandora.pp.fi * * Rearranged SIGIO support to use code from tty_io. 9Sept95 ctm@ardi.com * * Modularised 8-Sep-95 Philip Blundell * * Fixed keyboard lockups at open time * 3-Jul-96, 22-Aug-96 Roman Hodek * * Cleanup by Martin Mares, 01-Jun-97 (now uses the new PC kbd include) */ /* Uncomment the following line if your mouse needs initialization. */ /* #define INITIALIZE_DEVICE */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pc_keyb.h" #include /* * Generic declarations for both PS2 and 82C710 */ #define PSMOUSE_MINOR 1 /* minor device # for this mouse */ #define AUX_BUF_SIZE 2048 struct aux_queue { unsigned long head; unsigned long tail; struct wait_queue *proc_list; struct fasync_struct *fasync; unsigned char buf[AUX_BUF_SIZE]; }; static struct aux_queue *queue; static int aux_ready = 0; static int aux_count = 0; static int aux_present = 0; /* * Shared subroutines */ static unsigned int get_from_queue(void) { unsigned int result; unsigned long flags; save_flags(flags); cli(); result = queue->buf[queue->tail]; queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1); restore_flags(flags); return result; } static inline int queue_empty(void) { return queue->head == queue->tail; } static int fasync_aux(struct file *filp, int on) { int retval; retval = fasync_helper(filp, on, &queue->fasync); if (retval < 0) return retval; return 0; } /* * PS/2 Aux Device */ #define AUX_INTS_OFF (KBD_MODE_KCC | KBD_MODE_DISABLE_MOUSE | KBD_MODE_SYS | KBD_MODE_KBD_INT) #define AUX_INTS_ON (KBD_MODE_KCC | KBD_MODE_SYS | KBD_MODE_MOUSE_INT | KBD_MODE_KBD_INT) #define MAX_RETRIES 60 /* some aux operations take long time*/ /* * Status polling */ static int poll_aux_status(void) { int retries=0; unsigned char status; while ((kbd_read_status() & 0x03) && retries < MAX_RETRIES) { status = kbd_read_status(); kbd_pause(); if ((status & AUX_STAT_OBF) == AUX_STAT_OBF) { kbd_read_input(); kbd_pause(); } current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + (5*HZ + 99) / 100; schedule(); retries++; } return (retries < MAX_RETRIES); } /* * Write to aux device */ static void aux_write_dev(int val) { poll_aux_status(); kbd_write_command(KBD_CCMD_WRITE_MOUSE); /* Write magic cookie */ poll_aux_status(); kbd_write_output(val); /* Write data */ } /* * Write to device & handle returned ack */ #ifdef INITIALIZE_DEVICE __initfunc(static int aux_write_ack(int val)) { aux_write_dev(val); poll_aux_status(); if ((kbd_read_status() & AUX_STAT_OBF) == AUX_STAT_OBF) { return kbd_read_input(); } return 0; } #endif /* INITIALIZE_DEVICE */ /* * Write aux device command */ static void aux_write_cmd(int val) { poll_aux_status(); kbd_write_command(KBD_CCMD_WRITE_MODE); poll_aux_status(); kbd_write_output(val); } /* * AUX handler critical section start and end. * * Only one process can be in the critical section and all keyboard sends are * deferred as long as we're inside. This is necessary as we may sleep when * waiting for the keyboard controller and other processes / BH's can * preempt us. Please note that the input buffer must be flushed when * aux_end_atomic() is called and the interrupt is no longer enabled as not * doing so might cause the keyboard driver to ignore all incoming keystrokes. */ static struct semaphore aux_sema4 = MUTEX; static inline void aux_start_atomic(void) { down(&aux_sema4); disable_bh(KEYBOARD_BH); } static inline void aux_end_atomic(void) { enable_bh(KEYBOARD_BH); up(&aux_sema4); } /* * Interrupt from the auxiliary device: a character * is waiting in the keyboard/aux controller. */ #ifdef CONFIG_SGI /* On the SGI we export this routine because the keyboard chirps at * the same interrupt level. The status and data bytes are passed * directly to us if the keyboard interrupt service routine detects * that the keyboard is not the cause of the interrupt, see keyboard.c * for details. */ void aux_interrupt(unsigned char status, unsigned char data) { int head = queue->head; int maxhead = (queue->tail-1) & (AUX_BUF_SIZE-1); if ((status & AUX_STAT_OBF) != AUX_STAT_OBF) return; add_mouse_randomness(queue->buf[head] = data); if (head != maxhead) { head++; head &= AUX_BUF_SIZE-1; } queue->head = head; aux_ready = 1; if (queue->fasync) kill_fasync(queue->fasync, SIGIO); wake_up_interruptible(&queue->proc_list); } #else /* !defined(CONFIG_SGI) */ static void aux_interrupt(int cpl, void *dev_id, struct pt_regs * regs) { int head = queue->head; int maxhead = (queue->tail-1) & (AUX_BUF_SIZE-1); if ((kbd_read_status() & AUX_STAT_OBF) != AUX_STAT_OBF) return; add_mouse_randomness(queue->buf[head] = kbd_read_input()); if (head != maxhead) { head++; head &= AUX_BUF_SIZE-1; } queue->head = head; aux_ready = 1; if (queue->fasync) kill_fasync(queue->fasync, SIGIO); wake_up_interruptible(&queue->proc_list); } #endif /* !defined(CONFIG_SGI) */ static int release_aux(struct inode * inode, struct file * file) { fasync_aux(file, 0); if (--aux_count) return 0; aux_start_atomic(); aux_write_cmd(AUX_INTS_OFF); /* Disable controller ints */ poll_aux_status(); kbd_write_command(KBD_CCMD_MOUSE_DISABLE); /* Disable Aux device */ poll_aux_status(); aux_end_atomic(); ps2_free_irq(inode); MOD_DEC_USE_COUNT; return 0; } static int open_aux(struct inode * inode, struct file * file) { if (!aux_present) return -ENODEV; aux_start_atomic(); if (aux_count++) { aux_end_atomic(); return 0; } if (!poll_aux_status()) { /* FIXME: Race condition */ aux_count--; aux_end_atomic(); return -EBUSY; } queue->head = queue->tail = 0; /* Flush input queue */ if(ps2_request_irq()) { aux_count--; aux_end_atomic(); return -EBUSY; } MOD_INC_USE_COUNT; poll_aux_status(); kbd_write_command(KBD_CCMD_MOUSE_ENABLE); /* Enable Aux */ aux_write_dev(AUX_ENABLE_DEV); /* Enable aux device */ aux_write_cmd(AUX_INTS_ON); /* Enable controller ints */ poll_aux_status(); aux_end_atomic(); aux_ready = 0; return 0; } /* * Write to the aux device. */ static ssize_t write_aux(struct file * file, const char * buffer, size_t count, loff_t *ppos) { ssize_t retval = 0; if (count) { ssize_t written = 0; aux_start_atomic(); do { char c; if (!poll_aux_status()) break; kbd_write_command(KBD_CCMD_WRITE_MOUSE); if (!poll_aux_status()) break; get_user(c, buffer++); kbd_write_output(c); written++; } while (--count); aux_end_atomic(); retval = -EIO; if (written) { retval = written; file->f_dentry->d_inode->i_mtime = CURRENT_TIME; } } return retval; } /* * 82C710 Interface */ #ifdef CONFIG_82C710_MOUSE #define QP_DATA 0x310 /* Data Port I/O Address */ #define QP_STATUS 0x311 /* Status Port I/O Address */ #define QP_DEV_IDLE 0x01 /* Device Idle */ #define QP_RX_FULL 0x02 /* Device Char received */ #define QP_TX_IDLE 0x04 /* Device XMIT Idle */ #define QP_RESET 0x08 /* Device Reset */ #define QP_INTS_ON 0x10 /* Device Interrupt On */ #define QP_ERROR_FLAG 0x20 /* Device Error */ #define QP_CLEAR 0x40 /* Device Clear */ #define QP_ENABLE 0x80 /* Device Enable */ #define QP_IRQ 12 static int qp_present = 0; static int qp_count = 0; static int qp_data = QP_DATA; static int qp_status = QP_STATUS; static int poll_qp_status(void); static int probe_qp(void); /* * Interrupt handler for the 82C710 mouse port. A character * is waiting in the 82C710. */ static void qp_interrupt(int cpl, void *dev_id, struct pt_regs * regs) { int head = queue->head; int maxhead = (queue->tail-1) & (AUX_BUF_SIZE-1); add_mouse_randomness(queue->buf[head] = inb(qp_data)); if (head != maxhead) { head++; head &= AUX_BUF_SIZE-1; } queue->head = head; aux_ready = 1; if (queue->fasync) kill_fasync(queue->fasync, SIGIO); wake_up_interruptible(&queue->proc_list); } static int release_qp(struct inode * inode, struct file * file) { unsigned char status; fasync_aux(file, 0); if (!--qp_count) { if (!poll_qp_status()) printk("Warning: Mouse device busy in release_qp()\n"); status = inb_p(qp_status); outb_p(status & ~(QP_ENABLE|QP_INTS_ON), qp_status); if (!poll_qp_status()) printk("Warning: Mouse device busy in release_qp()\n"); free_irq(QP_IRQ, NULL); MOD_DEC_USE_COUNT; } return 0; } /* * Install interrupt handler. * Enable the device, enable interrupts. */ static int open_qp(struct inode * inode, struct file * file) { unsigned char status; if (!qp_present) return -EINVAL; if (qp_count++) return 0; if (request_irq(QP_IRQ, qp_interrupt, 0, "PS/2 Mouse", NULL)) { qp_count--; return -EBUSY; } status = inb_p(qp_status); status |= (QP_ENABLE|QP_RESET); outb_p(status, qp_status); status &= ~(QP_RESET); outb_p(status, qp_status); queue->head = queue->tail = 0; /* Flush input queue */ status |= QP_INTS_ON; outb_p(status, qp_status); /* Enable interrupts */ while (!poll_qp_status()) { printk("Error: Mouse device busy in open_qp()\n"); qp_count--; status &= ~(QP_ENABLE|QP_INTS_ON); outb_p(status, qp_status); free_irq(QP_IRQ, NULL); return -EBUSY; } outb_p(AUX_ENABLE_DEV, qp_data); /* Wake up mouse */ MOD_INC_USE_COUNT; return 0; } /* * Write to the 82C710 mouse device. */ static ssize_t write_qp(struct file * file, const char * buffer, size_t count, loff_t *ppos) { ssize_t i = count; while (i--) { char c; if (!poll_qp_status()) return -EIO; get_user(c, buffer++); outb_p(c, qp_data); } file->f_dentry->d_inode->i_mtime = CURRENT_TIME; return count; } /* * Wait for device to send output char and flush any input char. */ static int poll_qp_status(void) { int retries=0; while ((inb(qp_status)&(QP_RX_FULL|QP_TX_IDLE|QP_DEV_IDLE)) != (QP_DEV_IDLE|QP_TX_IDLE) && retries < MAX_RETRIES) { if (inb_p(qp_status)&(QP_RX_FULL)) inb_p(qp_data); current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + (5*HZ + 99) / 100; schedule(); retries++; } return !(retries==MAX_RETRIES); } /* * Function to read register in 82C710. */ static inline unsigned char read_710(unsigned char index) { outb_p(index, 0x390); /* Write index */ return inb_p(0x391); /* Read the data */ } /* * See if we can find a 82C710 device. Read mouse address. */ __initfunc(static int probe_qp(void)) { outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */ outb_p(0xaa, 0x3fa); /* Inverse of 55 */ outb_p(0x36, 0x3fa); /* Address the chip */ outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */ outb_p(0x1b, 0x2fa); /* Inverse of e4 */ if (read_710(0x0f) != 0xe4) /* Config address found? */ return 0; /* No: no 82C710 here */ qp_data = read_710(0x0d)*4; /* Get mouse I/O address */ qp_status = qp_data+1; outb_p(0x0f, 0x390); outb_p(0x0f, 0x391); /* Close config mode */ return 1; } #endif /* * Generic part continues... */ /* * Put bytes from input queue to buffer. */ static ssize_t read_aux(struct file * file, char * buffer, size_t count, loff_t *ppos) { struct wait_queue wait = { current, NULL }; ssize_t i = count; unsigned char c; if (queue_empty()) { if (file->f_flags & O_NONBLOCK) return -EAGAIN; add_wait_queue(&queue->proc_list, &wait); repeat: current->state = TASK_INTERRUPTIBLE; if (queue_empty() && !signal_pending(current)) { schedule(); goto repeat; } current->state = TASK_RUNNING; remove_wait_queue(&queue->proc_list, &wait); } while (i > 0 && !queue_empty()) { c = get_from_queue(); put_user(c, buffer++); i--; } aux_ready = !queue_empty(); if (count-i) { file->f_dentry->d_inode->i_atime = CURRENT_TIME; return count-i; } if (signal_pending(current)) return -ERESTARTSYS; return 0; } static unsigned int aux_poll(struct file *file, poll_table * wait) { poll_wait(&queue->proc_list, wait); if (aux_ready) return POLLIN | POLLRDNORM; return 0; } struct file_operations psaux_fops = { NULL, /* seek */ read_aux, write_aux, NULL, /* readdir */ aux_poll, NULL, /* ioctl */ NULL, /* mmap */ open_aux, release_aux, NULL, fasync_aux, }; /* * Initialize driver. First check for a 82C710 chip; if found * forget about the Aux port and use the *_qp functions. */ static struct miscdevice psaux_mouse = { PSMOUSE_MINOR, "ps2aux", &psaux_fops }; __initfunc(int psaux_init(void)) { int qp_found = 0; #ifdef CONFIG_82C710_MOUSE if ((qp_found = probe_qp())) { printk(KERN_INFO "82C710 type pointing device detected -- driver installed.\n"); /* printk("82C710 address = %x (should be 0x310)\n", qp_data); */ qp_present = 1; psaux_fops.write = write_qp; psaux_fops.open = open_qp; psaux_fops.release = release_qp; } else #endif #if defined(CONFIG_SGI) && defined(CONFIG_PSMOUSE) if (1) { #else if (aux_device_present == 0xaa) { #endif printk(KERN_INFO "PS/2 auxiliary pointing device detected -- driver installed.\n"); aux_present = 1; #ifdef CONFIG_VT kbd_read_mask = AUX_STAT_OBF; #endif } else { return -EIO; } misc_register(&psaux_mouse); queue = (struct aux_queue *) kmalloc(sizeof(*queue), GFP_KERNEL); memset(queue, 0, sizeof(*queue)); queue->head = queue->tail = 0; queue->proc_list = NULL; if (!qp_found) { aux_start_atomic(); #ifdef INITIALIZE_DEVICE kbd_write_command(AUX_ENABLE); /* Enable Aux */ aux_write_ack(AUX_SET_SAMPLE); aux_write_ack(100); /* 100 samples/sec */ aux_write_ack(AUX_SET_RES); aux_write_ack(3); /* 8 counts per mm */ aux_write_ack(AUX_SET_SCALE21); /* 2:1 scaling */ poll_aux_status(); #endif /* INITIALIZE_DEVICE */ kbd_write_command(KBD_CCMD_MOUSE_DISABLE); /* Disable Aux device */ poll_aux_status(); kbd_write_command(KBD_CCMD_WRITE_MODE); /* Disable controller interrupts */ poll_aux_status(); kbd_write_output(AUX_INTS_OFF); kbd_pause(); poll_aux_status(); aux_end_atomic(); } return 0; } #ifdef MODULE int init_module(void) { return psaux_init(); } void cleanup_module(void) { misc_deregister(&psaux_mouse); kfree(queue); } #endif