diff options
Diffstat (limited to 'drivers/macintosh/adb.c')
| -rw-r--r-- | drivers/macintosh/adb.c | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/drivers/macintosh/adb.c b/drivers/macintosh/adb.c new file mode 100644 index 000000000..1bbb9ca08 --- /dev/null +++ b/drivers/macintosh/adb.c @@ -0,0 +1,898 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for the Apple Desktop Bus + * and the /dev/adb device on macintoshes. + * + * Copyright (C) 1996 Paul Mackerras. + * + * Modified to declare controllers as structures, added + * client notification of bus reset and handles PowerBook + * sleep, by Benjamin Herrenschmidt. + * + * To do: + * + * - /sys/bus/adb to list the devices and infos + * - more /dev/adb to allow userland to receive the + * flow of auto-polling datas from a given device. + * - move bus probe to a kernel thread + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/sched/signal.h> +#include <linux/adb.h> +#include <linux/cuda.h> +#include <linux/pmu.h> +#include <linux/notifier.h> +#include <linux/wait.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/device.h> +#include <linux/kthread.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/of.h> + +#include <linux/uaccess.h> +#ifdef CONFIG_PPC +#include <asm/machdep.h> +#endif + + +EXPORT_SYMBOL(adb_client_list); + +extern struct adb_driver via_macii_driver; +extern struct adb_driver via_cuda_driver; +extern struct adb_driver adb_iop_driver; +extern struct adb_driver via_pmu_driver; +extern struct adb_driver macio_adb_driver; + +static DEFINE_MUTEX(adb_mutex); +static struct adb_driver *adb_driver_list[] = { +#ifdef CONFIG_ADB_MACII + &via_macii_driver, +#endif +#ifdef CONFIG_ADB_CUDA + &via_cuda_driver, +#endif +#ifdef CONFIG_ADB_IOP + &adb_iop_driver, +#endif +#ifdef CONFIG_ADB_PMU + &via_pmu_driver, +#endif +#ifdef CONFIG_ADB_MACIO + &macio_adb_driver, +#endif + NULL +}; + +static struct class *adb_dev_class; + +static struct adb_driver *adb_controller; +BLOCKING_NOTIFIER_HEAD(adb_client_list); +static int adb_got_sleep; +static int adb_inited; +static DEFINE_SEMAPHORE(adb_probe_mutex); +static int sleepy_trackpad; +static int autopoll_devs; +int __adb_probe_sync; + +static int adb_scan_bus(void); +static int do_adb_reset_bus(void); +static void adbdev_init(void); +static int try_handler_change(int, int); + +static struct adb_handler { + void (*handler)(unsigned char *, int, int); + int original_address; + int handler_id; + int busy; +} adb_handler[16]; + +/* + * The adb_handler_mutex mutex protects all accesses to the original_address + * and handler_id fields of adb_handler[i] for all i, and changes to the + * handler field. + * Accesses to the handler field are protected by the adb_handler_lock + * rwlock. It is held across all calls to any handler, so that by the + * time adb_unregister returns, we know that the old handler isn't being + * called. + */ +static DEFINE_MUTEX(adb_handler_mutex); +static DEFINE_RWLOCK(adb_handler_lock); + +#if 0 +static void printADBreply(struct adb_request *req) +{ + int i; + + printk("adb reply (%d)", req->reply_len); + for(i = 0; i < req->reply_len; i++) + printk(" %x", req->reply[i]); + printk("\n"); + +} +#endif + +static int adb_scan_bus(void) +{ + int i, highFree=0, noMovement; + int devmask = 0; + struct adb_request req; + + /* assumes adb_handler[] is all zeroes at this point */ + for (i = 1; i < 16; i++) { + /* see if there is anything at address i */ + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + (i << 4) | 0xf); + if (req.reply_len > 1) + /* one or more devices at this address */ + adb_handler[i].original_address = i; + else if (i > highFree) + highFree = i; + } + + /* Note we reset noMovement to 0 each time we move a device */ + for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { + for (i = 1; i < 16; i++) { + if (adb_handler[i].original_address == 0) + continue; + /* + * Send a "talk register 3" command to address i + * to provoke a collision if there is more than + * one device at this address. + */ + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + (i << 4) | 0xf); + /* + * Move the device(s) which didn't detect a + * collision to address `highFree'. Hopefully + * this only moves one device. + */ + adb_request(&req, NULL, ADBREQ_SYNC, 3, + (i<< 4) | 0xb, (highFree | 0x60), 0xfe); + /* + * See if anybody actually moved. This is suggested + * by HW TechNote 01: + * + * https://developer.apple.com/technotes/hw/hw_01.html + */ + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + (highFree << 4) | 0xf); + if (req.reply_len <= 1) continue; + /* + * Test whether there are any device(s) left + * at address i. + */ + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + (i << 4) | 0xf); + if (req.reply_len > 1) { + /* + * There are still one or more devices + * left at address i. Register the one(s) + * we moved to `highFree', and find a new + * value for highFree. + */ + adb_handler[highFree].original_address = + adb_handler[i].original_address; + while (highFree > 0 && + adb_handler[highFree].original_address) + highFree--; + if (highFree <= 0) + break; + + noMovement = 0; + } else { + /* + * No devices left at address i; move the + * one(s) we moved to `highFree' back to i. + */ + adb_request(&req, NULL, ADBREQ_SYNC, 3, + (highFree << 4) | 0xb, + (i | 0x60), 0xfe); + } + } + } + + /* Now fill in the handler_id field of the adb_handler entries. */ + for (i = 1; i < 16; i++) { + if (adb_handler[i].original_address == 0) + continue; + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + (i << 4) | 0xf); + adb_handler[i].handler_id = req.reply[2]; + printk(KERN_DEBUG "adb device [%d]: %d 0x%X\n", i, + adb_handler[i].original_address, + adb_handler[i].handler_id); + devmask |= 1 << i; + } + return devmask; +} + +/* + * This kernel task handles ADB probing. It dies once probing is + * completed. + */ +static int +adb_probe_task(void *x) +{ + pr_debug("adb: starting probe task...\n"); + do_adb_reset_bus(); + pr_debug("adb: finished probe task...\n"); + + up(&adb_probe_mutex); + + return 0; +} + +static void +__adb_probe_task(struct work_struct *bullshit) +{ + kthread_run(adb_probe_task, NULL, "kadbprobe"); +} + +static DECLARE_WORK(adb_reset_work, __adb_probe_task); + +int +adb_reset_bus(void) +{ + if (__adb_probe_sync) { + do_adb_reset_bus(); + return 0; + } + + down(&adb_probe_mutex); + schedule_work(&adb_reset_work); + return 0; +} + +#ifdef CONFIG_PM +/* + * notify clients before sleep + */ +static int __adb_suspend(struct platform_device *dev, pm_message_t state) +{ + adb_got_sleep = 1; + /* We need to get a lock on the probe thread */ + down(&adb_probe_mutex); + /* Stop autopoll */ + if (adb_controller->autopoll) + adb_controller->autopoll(0); + blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); + + return 0; +} + +static int adb_suspend(struct device *dev) +{ + return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND); +} + +static int adb_freeze(struct device *dev) +{ + return __adb_suspend(to_platform_device(dev), PMSG_FREEZE); +} + +static int adb_poweroff(struct device *dev) +{ + return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE); +} + +/* + * reset bus after sleep + */ +static int __adb_resume(struct platform_device *dev) +{ + adb_got_sleep = 0; + up(&adb_probe_mutex); + adb_reset_bus(); + + return 0; +} + +static int adb_resume(struct device *dev) +{ + return __adb_resume(to_platform_device(dev)); +} +#endif /* CONFIG_PM */ + +static int __init adb_init(void) +{ + struct adb_driver *driver; + int i; + +#ifdef CONFIG_PPC32 + if (!machine_is(chrp) && !machine_is(powermac)) + return 0; +#endif +#ifdef CONFIG_MAC + if (!MACH_IS_MAC) + return 0; +#endif + + /* xmon may do early-init */ + if (adb_inited) + return 0; + adb_inited = 1; + + adb_controller = NULL; + + i = 0; + while ((driver = adb_driver_list[i++]) != NULL) { + if (!driver->probe()) { + adb_controller = driver; + break; + } + } + if (adb_controller != NULL && adb_controller->init && + adb_controller->init()) + adb_controller = NULL; + if (adb_controller == NULL) { + pr_warn("Warning: no ADB interface detected\n"); + } else { +#ifdef CONFIG_PPC + if (of_machine_is_compatible("AAPL,PowerBook1998") || + of_machine_is_compatible("PowerBook1,1")) + sleepy_trackpad = 1; +#endif /* CONFIG_PPC */ + + adbdev_init(); + adb_reset_bus(); + } + return 0; +} + +device_initcall(adb_init); + +static int +do_adb_reset_bus(void) +{ + int ret; + + if (adb_controller == NULL) + return -ENXIO; + + if (adb_controller->autopoll) + adb_controller->autopoll(0); + + blocking_notifier_call_chain(&adb_client_list, + ADB_MSG_PRE_RESET, NULL); + + if (sleepy_trackpad) { + /* Let the trackpad settle down */ + msleep(500); + } + + mutex_lock(&adb_handler_mutex); + write_lock_irq(&adb_handler_lock); + memset(adb_handler, 0, sizeof(adb_handler)); + write_unlock_irq(&adb_handler_lock); + + /* That one is still a bit synchronous, oh well... */ + if (adb_controller->reset_bus) + ret = adb_controller->reset_bus(); + else + ret = 0; + + if (sleepy_trackpad) { + /* Let the trackpad settle down */ + msleep(1500); + } + + if (!ret) { + autopoll_devs = adb_scan_bus(); + if (adb_controller->autopoll) + adb_controller->autopoll(autopoll_devs); + } + mutex_unlock(&adb_handler_mutex); + + blocking_notifier_call_chain(&adb_client_list, + ADB_MSG_POST_RESET, NULL); + + return ret; +} + +void +adb_poll(void) +{ + if ((adb_controller == NULL)||(adb_controller->poll == NULL)) + return; + adb_controller->poll(); +} +EXPORT_SYMBOL(adb_poll); + +static void adb_sync_req_done(struct adb_request *req) +{ + struct completion *comp = req->arg; + + complete(comp); +} + +int +adb_request(struct adb_request *req, void (*done)(struct adb_request *), + int flags, int nbytes, ...) +{ + va_list list; + int i; + int rc; + struct completion comp; + + if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) + return -ENXIO; + if (nbytes < 1) + return -EINVAL; + + req->nbytes = nbytes+1; + req->done = done; + req->reply_expected = flags & ADBREQ_REPLY; + req->data[0] = ADB_PACKET; + va_start(list, nbytes); + for (i = 0; i < nbytes; ++i) + req->data[i+1] = va_arg(list, int); + va_end(list); + + if (flags & ADBREQ_NOSEND) + return 0; + + /* Synchronous requests block using an on-stack completion */ + if (flags & ADBREQ_SYNC) { + WARN_ON(done); + req->done = adb_sync_req_done; + req->arg = ∁ + init_completion(&comp); + } + + rc = adb_controller->send_request(req, 0); + + if ((flags & ADBREQ_SYNC) && !rc && !req->complete) + wait_for_completion(&comp); + + return rc; +} +EXPORT_SYMBOL(adb_request); + + /* Ultimately this should return the number of devices with + the given default id. + And it does it now ! Note: changed behaviour: This function + will now register if default_id _and_ handler_id both match + but handler_id can be left to 0 to match with default_id only. + When handler_id is set, this function will try to adjust + the handler_id id it doesn't match. */ +int +adb_register(int default_id, int handler_id, struct adb_ids *ids, + void (*handler)(unsigned char *, int, int)) +{ + int i; + + mutex_lock(&adb_handler_mutex); + ids->nids = 0; + for (i = 1; i < 16; i++) { + if ((adb_handler[i].original_address == default_id) && + (!handler_id || (handler_id == adb_handler[i].handler_id) || + try_handler_change(i, handler_id))) { + if (adb_handler[i].handler != 0) { + pr_err("Two handlers for ADB device %d\n", + default_id); + continue; + } + write_lock_irq(&adb_handler_lock); + adb_handler[i].handler = handler; + write_unlock_irq(&adb_handler_lock); + ids->id[ids->nids++] = i; + } + } + mutex_unlock(&adb_handler_mutex); + return ids->nids; +} +EXPORT_SYMBOL(adb_register); + +int +adb_unregister(int index) +{ + int ret = -ENODEV; + + mutex_lock(&adb_handler_mutex); + write_lock_irq(&adb_handler_lock); + if (adb_handler[index].handler) { + while(adb_handler[index].busy) { + write_unlock_irq(&adb_handler_lock); + yield(); + write_lock_irq(&adb_handler_lock); + } + ret = 0; + adb_handler[index].handler = NULL; + } + write_unlock_irq(&adb_handler_lock); + mutex_unlock(&adb_handler_mutex); + return ret; +} +EXPORT_SYMBOL(adb_unregister); + +void +adb_input(unsigned char *buf, int nb, int autopoll) +{ + int i, id; + static int dump_adb_input; + unsigned long flags; + + void (*handler)(unsigned char *, int, int); + + /* We skip keystrokes and mouse moves when the sleep process + * has been started. We stop autopoll, but this is another security + */ + if (adb_got_sleep) + return; + + id = buf[0] >> 4; + if (dump_adb_input) { + pr_info("adb packet: "); + for (i = 0; i < nb; ++i) + pr_cont(" %x", buf[i]); + pr_cont(", id = %d\n", id); + } + write_lock_irqsave(&adb_handler_lock, flags); + handler = adb_handler[id].handler; + if (handler != NULL) + adb_handler[id].busy = 1; + write_unlock_irqrestore(&adb_handler_lock, flags); + if (handler != NULL) { + (*handler)(buf, nb, autopoll); + wmb(); + adb_handler[id].busy = 0; + } + +} + +/* Try to change handler to new_id. Will return 1 if successful. */ +static int try_handler_change(int address, int new_id) +{ + struct adb_request req; + + if (adb_handler[address].handler_id == new_id) + return 1; + adb_request(&req, NULL, ADBREQ_SYNC, 3, + ADB_WRITEREG(address, 3), address | 0x20, new_id); + adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, + ADB_READREG(address, 3)); + if (req.reply_len < 2) + return 0; + if (req.reply[2] != new_id) + return 0; + adb_handler[address].handler_id = req.reply[2]; + + return 1; +} + +int +adb_try_handler_change(int address, int new_id) +{ + int ret; + + mutex_lock(&adb_handler_mutex); + ret = try_handler_change(address, new_id); + mutex_unlock(&adb_handler_mutex); + if (ret) + pr_debug("adb handler change: [%d] 0x%X\n", address, new_id); + return ret; +} +EXPORT_SYMBOL(adb_try_handler_change); + +int +adb_get_infos(int address, int *original_address, int *handler_id) +{ + mutex_lock(&adb_handler_mutex); + *original_address = adb_handler[address].original_address; + *handler_id = adb_handler[address].handler_id; + mutex_unlock(&adb_handler_mutex); + + return (*original_address != 0); +} + + +/* + * /dev/adb device driver. + */ + +#define ADB_MAJOR 56 /* major number for /dev/adb */ + +struct adbdev_state { + spinlock_t lock; + atomic_t n_pending; + struct adb_request *completed; + wait_queue_head_t wait_queue; + int inuse; +}; + +static void adb_write_done(struct adb_request *req) +{ + struct adbdev_state *state = (struct adbdev_state *) req->arg; + unsigned long flags; + + if (!req->complete) { + req->reply_len = 0; + req->complete = 1; + } + spin_lock_irqsave(&state->lock, flags); + atomic_dec(&state->n_pending); + if (!state->inuse) { + kfree(req); + if (atomic_read(&state->n_pending) == 0) { + spin_unlock_irqrestore(&state->lock, flags); + kfree(state); + return; + } + } else { + struct adb_request **ap = &state->completed; + while (*ap != NULL) + ap = &(*ap)->next; + req->next = NULL; + *ap = req; + wake_up_interruptible(&state->wait_queue); + } + spin_unlock_irqrestore(&state->lock, flags); +} + +static int +do_adb_query(struct adb_request *req) +{ + int ret = -EINVAL; + + switch(req->data[1]) { + case ADB_QUERY_GETDEVINFO: + if (req->nbytes < 3 || req->data[2] >= 16) + break; + mutex_lock(&adb_handler_mutex); + req->reply[0] = adb_handler[req->data[2]].original_address; + req->reply[1] = adb_handler[req->data[2]].handler_id; + mutex_unlock(&adb_handler_mutex); + req->complete = 1; + req->reply_len = 2; + adb_write_done(req); + ret = 0; + break; + } + return ret; +} + +static int adb_open(struct inode *inode, struct file *file) +{ + struct adbdev_state *state; + int ret = 0; + + mutex_lock(&adb_mutex); + if (iminor(inode) > 0 || adb_controller == NULL) { + ret = -ENXIO; + goto out; + } + state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); + if (state == 0) { + ret = -ENOMEM; + goto out; + } + file->private_data = state; + spin_lock_init(&state->lock); + atomic_set(&state->n_pending, 0); + state->completed = NULL; + init_waitqueue_head(&state->wait_queue); + state->inuse = 1; + +out: + mutex_unlock(&adb_mutex); + return ret; +} + +static int adb_release(struct inode *inode, struct file *file) +{ + struct adbdev_state *state = file->private_data; + unsigned long flags; + + mutex_lock(&adb_mutex); + if (state) { + file->private_data = NULL; + spin_lock_irqsave(&state->lock, flags); + if (atomic_read(&state->n_pending) == 0 + && state->completed == NULL) { + spin_unlock_irqrestore(&state->lock, flags); + kfree(state); + } else { + state->inuse = 0; + spin_unlock_irqrestore(&state->lock, flags); + } + } + mutex_unlock(&adb_mutex); + return 0; +} + +static ssize_t adb_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int ret = 0; + struct adbdev_state *state = file->private_data; + struct adb_request *req; + DECLARE_WAITQUEUE(wait, current); + unsigned long flags; + + if (count < 2) + return -EINVAL; + if (count > sizeof(req->reply)) + count = sizeof(req->reply); + + req = NULL; + spin_lock_irqsave(&state->lock, flags); + add_wait_queue(&state->wait_queue, &wait); + set_current_state(TASK_INTERRUPTIBLE); + + for (;;) { + req = state->completed; + if (req != NULL) + state->completed = req->next; + else if (atomic_read(&state->n_pending) == 0) + ret = -EIO; + if (req != NULL || ret != 0) + break; + + if (file->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + break; + } + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + spin_unlock_irqrestore(&state->lock, flags); + schedule(); + spin_lock_irqsave(&state->lock, flags); + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(&state->wait_queue, &wait); + spin_unlock_irqrestore(&state->lock, flags); + + if (ret) + return ret; + + ret = req->reply_len; + if (ret > count) + ret = count; + if (ret > 0 && copy_to_user(buf, req->reply, ret)) + ret = -EFAULT; + + kfree(req); + return ret; +} + +static ssize_t adb_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + int ret/*, i*/; + struct adbdev_state *state = file->private_data; + struct adb_request *req; + + if (count < 2 || count > sizeof(req->data)) + return -EINVAL; + if (adb_controller == NULL) + return -ENXIO; + + req = kmalloc(sizeof(struct adb_request), + GFP_KERNEL); + if (req == NULL) + return -ENOMEM; + + req->nbytes = count; + req->done = adb_write_done; + req->arg = (void *) state; + req->complete = 0; + + ret = -EFAULT; + if (copy_from_user(req->data, buf, count)) + goto out; + + atomic_inc(&state->n_pending); + + /* If a probe is in progress or we are sleeping, wait for it to complete */ + down(&adb_probe_mutex); + + /* Queries are special requests sent to the ADB driver itself */ + if (req->data[0] == ADB_QUERY) { + if (count > 1) + ret = do_adb_query(req); + else + ret = -EINVAL; + up(&adb_probe_mutex); + } + /* Special case for ADB_BUSRESET request, all others are sent to + the controller */ + else if ((req->data[0] == ADB_PACKET) && (count > 1) + && (req->data[1] == ADB_BUSRESET)) { + ret = do_adb_reset_bus(); + up(&adb_probe_mutex); + atomic_dec(&state->n_pending); + if (ret == 0) + ret = count; + goto out; + } else { + req->reply_expected = ((req->data[1] & 0xc) == 0xc); + if (adb_controller && adb_controller->send_request) + ret = adb_controller->send_request(req, 0); + else + ret = -ENXIO; + up(&adb_probe_mutex); + } + + if (ret != 0) { + atomic_dec(&state->n_pending); + goto out; + } + return count; + +out: + kfree(req); + return ret; +} + +static const struct file_operations adb_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = adb_read, + .write = adb_write, + .open = adb_open, + .release = adb_release, +}; + +#ifdef CONFIG_PM +static const struct dev_pm_ops adb_dev_pm_ops = { + .suspend = adb_suspend, + .resume = adb_resume, + /* Hibernate hooks */ + .freeze = adb_freeze, + .thaw = adb_resume, + .poweroff = adb_poweroff, + .restore = adb_resume, +}; +#endif + +static struct platform_driver adb_pfdrv = { + .driver = { + .name = "adb", +#ifdef CONFIG_PM + .pm = &adb_dev_pm_ops, +#endif + }, +}; + +static struct platform_device adb_pfdev = { + .name = "adb", +}; + +static int __init +adb_dummy_probe(struct platform_device *dev) +{ + if (dev == &adb_pfdev) + return 0; + return -ENODEV; +} + +static void __init +adbdev_init(void) +{ + if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { + pr_err("adb: unable to get major %d\n", ADB_MAJOR); + return; + } + + adb_dev_class = class_create(THIS_MODULE, "adb"); + if (IS_ERR(adb_dev_class)) + return; + device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); + + platform_device_register(&adb_pfdev); + platform_driver_probe(&adb_pfdrv, adb_dummy_probe); +} |