/* * 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@cs.hut.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@cs.hut.fi */ /* Uncomment the following line if your mouse needs initialization. */ /* #define INITIALIZE_DEVICE */ #include #include #include #include #include #include #include #include #include /* aux controller ports */ #define AUX_INPUT_PORT 0x60 /* Aux device output buffer */ #define AUX_OUTPUT_PORT 0x60 /* Aux device input buffer */ #define AUX_COMMAND 0x64 /* Aux device command buffer */ #define AUX_STATUS 0x64 /* Aux device status reg */ /* aux controller status bits */ #define AUX_OBUF_FULL 0x21 /* output buffer (from device) full */ #define AUX_IBUF_FULL 0x02 /* input buffer (to device) full */ /* aux controller commands */ #define AUX_CMD_WRITE 0x60 /* value to write to controller */ #define AUX_MAGIC_WRITE 0xd4 /* value to send aux device data */ #define AUX_INTS_ON 0x47 /* enable controller interrupts */ #define AUX_INTS_OFF 0x65 /* disable controller interrupts */ #define AUX_DISABLE 0xa7 /* disable aux */ #define AUX_ENABLE 0xa8 /* enable aux */ /* aux device commands */ #define AUX_SET_RES 0xe8 /* set resolution */ #define AUX_SET_SCALE11 0xe6 /* set 1:1 scaling */ #define AUX_SET_SCALE21 0xe7 /* set 2:1 scaling */ #define AUX_GET_SCALE 0xe9 /* get scaling factor */ #define AUX_SET_STREAM 0xea /* set stream mode */ #define AUX_SET_SAMPLE 0xf3 /* set sample rate */ #define AUX_ENABLE_DEV 0xf4 /* enable aux device */ #define AUX_DISABLE_DEV 0xf5 /* disable aux device */ #define AUX_RESET 0xff /* reset aux device */ #define MAX_RETRIES 60 /* some aux operations take long time*/ #define AUX_IRQ 12 #define AUX_BUF_SIZE 2048 /* 82C710 definitions */ #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 extern unsigned char aux_device_present; extern unsigned char kbd_read_mask; /* from keyboard.c */ struct aux_queue { unsigned long head; unsigned long tail; struct wait_queue *proc_list; unsigned char buf[AUX_BUF_SIZE]; }; static struct aux_queue *queue; static int aux_ready = 0; static int aux_busy = 0; static int aux_present = 0; static int poll_aux_status(void); #ifdef CONFIG_82C710_MOUSE static int qp_present = 0; static int qp_busy = 0; static int qp_data = QP_DATA; static int qp_status = QP_STATUS; static int poll_qp_status(void); static int probe_qp(void); #endif /* * Write to aux device */ static void aux_write_dev(int val) { poll_aux_status(); outb_p(AUX_MAGIC_WRITE,AUX_COMMAND); /* write magic cookie */ poll_aux_status(); outb_p(val,AUX_OUTPUT_PORT); /* write data */ } /* * Write to device & handle returned ack */ #if defined INITIALIZE_DEVICE static int aux_write_ack(int val) { int retries = 0; aux_write_dev(val); /* write the value to the device */ while ((inb(AUX_STATUS) & AUX_OBUF_FULL) != AUX_OBUF_FULL && retries < MAX_RETRIES) { /* wait for ack */ current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + 5; schedule(); retries++; } if ((inb(AUX_STATUS) & AUX_OBUF_FULL) == AUX_OBUF_FULL) { return (inb(AUX_INPUT_PORT)); } return 0; } #endif /* INITIALIZE_DEVICE */ /* * Write aux device command */ static void aux_write_cmd(int val) { poll_aux_status(); outb_p(AUX_CMD_WRITE,AUX_COMMAND); poll_aux_status(); outb_p(val,AUX_OUTPUT_PORT); } 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; } /* * Interrupt from the auxiliary device: a character * is waiting in the keyboard/aux controller. */ static void aux_interrupt(int cpl, struct pt_regs * regs) { int head = queue->head; int maxhead = (queue->tail-1) & (AUX_BUF_SIZE-1); queue->buf[head] = inb(AUX_INPUT_PORT); if (head != maxhead) { head++; head &= AUX_BUF_SIZE-1; } queue->head = head; aux_ready = 1; wake_up_interruptible(&queue->proc_list); } /* * Interrupt handler for the 82C710 mouse port. A character * is waiting in the 82C710. */ #ifdef CONFIG_82C710_MOUSE static void qp_interrupt(int cpl, struct pt_regs * regs) { int head = queue->head; int maxhead = (queue->tail-1) & (AUX_BUF_SIZE-1); queue->buf[head] = inb(qp_data); if (head != maxhead) { head++; head &= AUX_BUF_SIZE-1; } queue->head = head; aux_ready = 1; wake_up_interruptible(&queue->proc_list); } #endif static void release_aux(struct inode * inode, struct file * file) { aux_write_dev(AUX_DISABLE_DEV); /* disable aux device */ aux_write_cmd(AUX_INTS_OFF); /* disable controller ints */ poll_aux_status(); outb_p(AUX_DISABLE,AUX_COMMAND); /* Disable Aux device */ poll_aux_status(); free_irq(AUX_IRQ); aux_busy = 0; } #ifdef CONFIG_82C710_MOUSE static void release_qp(struct inode * inode, struct file * file) { unsigned char status; 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); qp_busy = 0; } #endif /* * Install interrupt handler. * Enable auxiliary device. */ static int open_aux(struct inode * inode, struct file * file) { if (!aux_present) return -EINVAL; if (aux_busy) return -EBUSY; if (!poll_aux_status()) return -EBUSY; aux_busy = 1; queue->head = queue->tail = 0; /* Flush input queue */ if (request_irq(AUX_IRQ, aux_interrupt, 0, "PS/2 Mouse")) { aux_busy = 0; return -EBUSY; } poll_aux_status(); outb_p(AUX_ENABLE,AUX_COMMAND); /* Enable Aux */ aux_write_dev(AUX_ENABLE_DEV); /* enable aux device */ aux_write_cmd(AUX_INTS_ON); /* enable controller ints */ poll_aux_status(); aux_ready = 0; return 0; } #ifdef CONFIG_82C710_MOUSE /* * Install interrupt handler. * Enable the device, enable interrupts. Set qp_busy * (allow only one opener at a time.) */ static int open_qp(struct inode * inode, struct file * file) { unsigned char status; if (!qp_present) return -EINVAL; if (qp_busy) return -EBUSY; if (request_irq(QP_IRQ, qp_interrupt, 0, "PS/2 Mouse")) return -EBUSY; qp_busy = 1; 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"); return -EBUSY; } outb_p(AUX_ENABLE_DEV, qp_data); /* Wake up mouse */ return 0; } #endif /* * Write to the aux device. */ static int write_aux(struct inode * inode, struct file * file, char * buffer, int count) { int i = count; while (i--) { if (!poll_aux_status()) return -EIO; outb_p(AUX_MAGIC_WRITE,AUX_COMMAND); if (!poll_aux_status()) return -EIO; outb_p(get_fs_byte(buffer++),AUX_OUTPUT_PORT); } inode->i_mtime = CURRENT_TIME; return count; } #ifdef CONFIG_82C710_MOUSE /* * Write to the 82C710 mouse device. */ static int write_qp(struct inode * inode, struct file * file, char * buffer, int count) { int i = count; while (i--) { if (!poll_qp_status()) return -EIO; outb_p(get_fs_byte(buffer++), qp_data); } inode->i_mtime = CURRENT_TIME; return count; } #endif /* * Put bytes from input queue to buffer. */ static int read_aux(struct inode * inode, struct file * file, char * buffer, int count) { struct wait_queue wait = { current, NULL }; int 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() && !(current->signal & ~current->blocked)) { schedule(); goto repeat; } current->state = TASK_RUNNING; remove_wait_queue(&queue->proc_list, &wait); } while (i > 0 && !queue_empty()) { c = get_from_queue(); put_fs_byte(c, buffer++); i--; } aux_ready = !queue_empty(); if (count-i) { inode->i_atime = CURRENT_TIME; return count-i; } if (current->signal & ~current->blocked) return -ERESTARTSYS; return 0; } static int aux_select(struct inode *inode, struct file *file, int sel_type, select_table * wait) { if (sel_type != SEL_IN) return 0; if (aux_ready) return 1; select_wait(&queue->proc_list, wait); return 0; } struct file_operations psaux_fops = { NULL, /* seek */ read_aux, write_aux, NULL, /* readdir */ aux_select, NULL, /* ioctl */ NULL, /* mmap */ open_aux, release_aux, }; /* * Initialize driver. First check for a 82C710 chip; if found * forget about the Aux port and use the *_qp functions. */ unsigned long psaux_init(unsigned long kmem_start) { int qp_found = 0; #ifdef CONFIG_82C710_MOUSE if ((qp_found = probe_qp())) { printk("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; poll_qp_status(); } else #endif if (aux_device_present == 0xaa) { printk("PS/2 auxiliary pointing device detected -- driver installed.\n"); aux_present = 1; kbd_read_mask = AUX_OBUF_FULL; poll_aux_status(); } else { return kmem_start; /* No mouse at all */ } queue = (struct aux_queue *) kmem_start; kmem_start += sizeof (struct aux_queue); queue->head = queue->tail = 0; queue->proc_list = NULL; if (!qp_found) { #if defined INITIALIZE_DEVICE outb_p(AUX_ENABLE,AUX_COMMAND); /* 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 */ outb_p(AUX_DISABLE,AUX_COMMAND); /* Disable Aux device */ aux_write_cmd(AUX_INTS_OFF); /* disable controller ints */ poll_aux_status(); } return kmem_start; } static int poll_aux_status(void) { int retries=0; while ((inb(AUX_STATUS)&0x03) && retries < MAX_RETRIES) { if (inb_p(AUX_STATUS) & AUX_OBUF_FULL == AUX_OBUF_FULL) inb_p(AUX_INPUT_PORT); current->state = TASK_INTERRUPTIBLE; current->timeout = jiffies + 5; schedule(); retries++; } return !(retries==MAX_RETRIES); } #ifdef CONFIG_82C710_MOUSE /* * 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; 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. */ 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