| // 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, 1); |
| 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) { |
| 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) { |
| 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("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); |
| } |