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- /*
- * 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 <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/fcntl.h>
- #include <linux/errno.h>
- #include <linux/timer.h>
-
- #include <asm/io.h>
- #include <asm/segment.h>
- #include <asm/system.h>
-
- #include <linux/config.h>
-
- /* 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
-