diff options
author | Andy Walls <awalls@md.metrocast.net> | 2011-02-07 22:30:55 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-03-22 19:23:59 -0300 |
commit | 5bd6b0464b68d429bc8a3fe6595d19c39dfc4d95 (patch) | |
tree | 884f301574395cf271eee6972925c5425a69f906 /drivers/staging/lirc | |
parent | 534c1eab1e2770dca3cf4616cc4059683020114b (diff) |
[media] lirc_zilog: Add ref counting of struct IR, IR_tx, and IR_rx
This is a major change to add pointer reference counting for
struct IR, struct IR_tx, and struct IR_rx object instances.
This ref counting gets lirc_zilog closer to gracefully handling
bridge drivers and hot-unplugged USB devices disappearing out from
under lirc_zilog when the /dev/lircN node is still open. (mutexes
to protect the i2c_client pointers in struct IR_tx and struct IR_rx
still need to be added.)
This reference counting also helps lirc_zilog clean up properly
when the i2c_clients disappear.
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/staging/lirc')
-rw-r--r-- | drivers/staging/lirc/lirc_zilog.c | 584 |
1 files changed, 380 insertions, 204 deletions
diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c index d06788561189..5df90dbba1c6 100644 --- a/drivers/staging/lirc/lirc_zilog.c +++ b/drivers/staging/lirc/lirc_zilog.c @@ -63,8 +63,14 @@ #include <media/lirc_dev.h> #include <media/lirc.h> +struct IR; + struct IR_rx { + struct kref ref; + struct IR *ir; + /* RX device */ + /* FIXME mutex lock access to this pointer */ struct i2c_client *c; /* RX polling thread data */ @@ -76,7 +82,11 @@ struct IR_rx { }; struct IR_tx { + struct kref ref; + struct IR *ir; + /* TX device */ + /* FIXME mutex lock access to this pointer */ struct i2c_client *c; /* TX additional actions needed */ @@ -85,8 +95,10 @@ struct IR_tx { }; struct IR { + struct kref ref; struct list_head list; + /* FIXME spinlock access to l.features */ struct lirc_driver l; struct lirc_buffer rbuf; @@ -94,11 +106,21 @@ struct IR { atomic_t open_count; struct i2c_adapter *adapter; + + spinlock_t rx_ref_lock; /* struct IR_rx kref get()/put() */ struct IR_rx *rx; + + spinlock_t tx_ref_lock; /* struct IR_tx kref get()/put() */ struct IR_tx *tx; }; /* IR transceiver instance object list */ +/* + * This lock is used for the following: + * a. ir_devices_list access, insertions, deletions + * b. struct IR kref get()s and put()s + * c. serialization of ir_probe() for the two i2c_clients for a Z8 + */ static DEFINE_MUTEX(ir_devices_lock); static LIST_HEAD(ir_devices_list); @@ -146,6 +168,157 @@ static int minor = -1; /* minor number */ ## args); \ } while (0) + +/* struct IR reference counting */ +static struct IR *get_ir_device(struct IR *ir, bool ir_devices_lock_held) +{ + if (ir_devices_lock_held) { + kref_get(&ir->ref); + } else { + mutex_lock(&ir_devices_lock); + kref_get(&ir->ref); + mutex_unlock(&ir_devices_lock); + } + return ir; +} + +static void release_ir_device(struct kref *ref) +{ + struct IR *ir = container_of(ref, struct IR, ref); + + /* + * Things should be in this state by now: + * ir->rx set to NULL and deallocated - happens before ir->rx->ir put() + * ir->rx->task kthread stopped - happens before ir->rx->ir put() + * ir->tx set to NULL and deallocated - happens before ir->tx->ir put() + * ir->open_count == 0 - happens on final close() + * ir_lock, tx_ref_lock, rx_ref_lock, all released + */ + if (ir->l.minor >= 0 && ir->l.minor < MAX_IRCTL_DEVICES) { + lirc_unregister_driver(ir->l.minor); + ir->l.minor = MAX_IRCTL_DEVICES; + } + if (ir->rbuf.fifo_initialized) + lirc_buffer_free(&ir->rbuf); + list_del(&ir->list); + kfree(ir); +} + +static int put_ir_device(struct IR *ir, bool ir_devices_lock_held) +{ + int released; + + if (ir_devices_lock_held) + return kref_put(&ir->ref, release_ir_device); + + mutex_lock(&ir_devices_lock); + released = kref_put(&ir->ref, release_ir_device); + mutex_unlock(&ir_devices_lock); + + return released; +} + +/* struct IR_rx reference counting */ +static struct IR_rx *get_ir_rx(struct IR *ir) +{ + struct IR_rx *rx; + + spin_lock(&ir->rx_ref_lock); + rx = ir->rx; + if (rx != NULL) + kref_get(&rx->ref); + spin_unlock(&ir->rx_ref_lock); + return rx; +} + +static void destroy_rx_kthread(struct IR_rx *rx, bool ir_devices_lock_held) +{ + /* end up polling thread */ + if (!IS_ERR_OR_NULL(rx->task)) { + kthread_stop(rx->task); + rx->task = NULL; + /* Put the ir ptr that ir_probe() gave to the rx poll thread */ + put_ir_device(rx->ir, ir_devices_lock_held); + } +} + +static void release_ir_rx(struct kref *ref) +{ + struct IR_rx *rx = container_of(ref, struct IR_rx, ref); + struct IR *ir = rx->ir; + + /* + * This release function can't do all the work, as we want + * to keep the rx_ref_lock a spinlock, and killing the poll thread + * and releasing the ir reference can cause a sleep. That work is + * performed by put_ir_rx() + */ + ir->l.features &= ~LIRC_CAN_REC_LIRCCODE; + /* Don't put_ir_device(rx->ir) here; lock can't be freed yet */ + ir->rx = NULL; + /* Don't do the kfree(rx) here; we still need to kill the poll thread */ + return; +} + +static int put_ir_rx(struct IR_rx *rx, bool ir_devices_lock_held) +{ + int released; + struct IR *ir = rx->ir; + + spin_lock(&ir->rx_ref_lock); + released = kref_put(&rx->ref, release_ir_rx); + spin_unlock(&ir->rx_ref_lock); + /* Destroy the rx kthread while not holding the spinlock */ + if (released) { + destroy_rx_kthread(rx, ir_devices_lock_held); + kfree(rx); + /* Make sure we're not still in a poll_table somewhere */ + wake_up_interruptible(&ir->rbuf.wait_poll); + } + /* Do a reference put() for the rx->ir reference, if we released rx */ + if (released) + put_ir_device(ir, ir_devices_lock_held); + return released; +} + +/* struct IR_tx reference counting */ +static struct IR_tx *get_ir_tx(struct IR *ir) +{ + struct IR_tx *tx; + + spin_lock(&ir->tx_ref_lock); + tx = ir->tx; + if (tx != NULL) + kref_get(&tx->ref); + spin_unlock(&ir->tx_ref_lock); + return tx; +} + +static void release_ir_tx(struct kref *ref) +{ + struct IR_tx *tx = container_of(ref, struct IR_tx, ref); + struct IR *ir = tx->ir; + + ir->l.features &= ~LIRC_CAN_SEND_PULSE; + /* Don't put_ir_device(tx->ir) here, so our lock doesn't get freed */ + ir->tx = NULL; + kfree(tx); +} + +static int put_ir_tx(struct IR_tx *tx, bool ir_devices_lock_held) +{ + int released; + struct IR *ir = tx->ir; + + spin_lock(&ir->tx_ref_lock); + released = kref_put(&tx->ref, release_ir_tx); + spin_unlock(&ir->tx_ref_lock); + /* Do a reference put() for the tx->ir reference, if we released tx */ + if (released) + put_ir_device(ir, ir_devices_lock_held); + return released; +} + static int add_to_buf(struct IR *ir) { __u16 code; @@ -156,23 +329,29 @@ static int add_to_buf(struct IR *ir) int failures = 0; unsigned char sendbuf[1] = { 0 }; struct lirc_buffer *rbuf = ir->l.rbuf; - struct IR_rx *rx = ir->rx; - - if (rx == NULL) - return -ENXIO; + struct IR_rx *rx; + struct IR_tx *tx; if (lirc_buffer_full(rbuf)) { dprintk("buffer overflow\n"); return -EOVERFLOW; } + rx = get_ir_rx(ir); + if (rx == NULL) + return -ENXIO; + + tx = get_ir_tx(ir); + /* * service the device as long as it is returning * data and we have space */ do { - if (kthread_should_stop()) - return -ENODATA; + if (kthread_should_stop()) { + ret = -ENODATA; + break; + } /* * Lock i2c bus for the duration. RX/TX chips interfere so @@ -182,7 +361,8 @@ static int add_to_buf(struct IR *ir) if (kthread_should_stop()) { mutex_unlock(&ir->ir_lock); - return -ENODATA; + ret = -ENODATA; + break; } /* @@ -196,7 +376,7 @@ static int add_to_buf(struct IR *ir) mutex_unlock(&ir->ir_lock); zilog_error("unable to read from the IR chip " "after 3 resets, giving up\n"); - return ret; + break; } /* Looks like the chip crashed, reset it */ @@ -206,20 +386,23 @@ static int add_to_buf(struct IR *ir) set_current_state(TASK_UNINTERRUPTIBLE); if (kthread_should_stop()) { mutex_unlock(&ir->ir_lock); - return -ENODATA; + ret = -ENODATA; + break; } schedule_timeout((100 * HZ + 999) / 1000); - if (ir->tx != NULL) - ir->tx->need_boot = 1; + if (tx != NULL) + tx->need_boot = 1; ++failures; mutex_unlock(&ir->ir_lock); + ret = 0; continue; } if (kthread_should_stop()) { mutex_unlock(&ir->ir_lock); - return -ENODATA; + ret = -ENODATA; + break; } ret = i2c_master_recv(rx->c, keybuf, sizeof(keybuf)); mutex_unlock(&ir->ir_lock); @@ -235,12 +418,17 @@ static int add_to_buf(struct IR *ir) /* key pressed ? */ if (rx->hdpvr_data_fmt) { - if (got_data && (keybuf[0] == 0x80)) - return 0; - else if (got_data && (keybuf[0] == 0x00)) - return -ENODATA; - } else if ((rx->b[0] & 0x80) == 0) - return got_data ? 0 : -ENODATA; + if (got_data && (keybuf[0] == 0x80)) { + ret = 0; + break; + } else if (got_data && (keybuf[0] == 0x00)) { + ret = -ENODATA; + break; + } + } else if ((rx->b[0] & 0x80) == 0) { + ret = got_data ? 0 : -ENODATA; + break; + } /* look what we have */ code = (((__u16)rx->b[0] & 0x7f) << 6) | (rx->b[1] >> 2); @@ -251,9 +439,13 @@ static int add_to_buf(struct IR *ir) /* return it */ lirc_buffer_write(rbuf, codes); ++got_data; + ret = 0; } while (!lirc_buffer_full(rbuf)); - return 0; + if (tx != NULL) + put_ir_tx(tx, false); + put_ir_rx(rx, false); + return ret; } /* @@ -274,14 +466,14 @@ static int lirc_thread(void *arg) dprintk("poll thread started\n"); while (!kthread_should_stop()) { - set_current_state(TASK_INTERRUPTIBLE); - /* if device not opened, we can sleep half a second */ if (atomic_read(&ir->open_count) == 0) { schedule_timeout(HZ/2); continue; } + set_current_state(TASK_INTERRUPTIBLE); + /* * This is ~113*2 + 24 + jitter (2*repeat gap + code length). * We use this interval as the chip resets every time you poll @@ -564,7 +756,7 @@ static int fw_load(struct IR_tx *tx) } /* Request codeset data file */ - ret = request_firmware(&fw_entry, "haup-ir-blaster.bin", &tx->c->dev); + ret = request_firmware(&fw_entry, "haup-ir-blaster.bin", tx->ir->l.dev); if (ret != 0) { zilog_error("firmware haup-ir-blaster.bin not available " "(%d)\n", ret); @@ -690,45 +882,26 @@ out: return ret; } -/* initialise the IR TX device */ -static int tx_init(struct IR_tx *tx) -{ - int ret; - - /* Load 'firmware' */ - ret = fw_load(tx); - if (ret != 0) - return ret; - - /* Send boot block */ - ret = send_boot_data(tx); - if (ret != 0) - return ret; - tx->need_boot = 0; - - /* Looks good */ - return 0; -} - /* copied from lirc_dev */ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos) { struct IR *ir = filep->private_data; - struct IR_rx *rx = ir->rx; + struct IR_rx *rx; struct lirc_buffer *rbuf = ir->l.rbuf; int ret = 0, written = 0; unsigned int m; DECLARE_WAITQUEUE(wait, current); dprintk("read called\n"); - if (rx == NULL) - return -ENODEV; - if (n % rbuf->chunk_size) { dprintk("read result = -EINVAL\n"); return -EINVAL; } + rx = get_ir_rx(ir); + if (rx == NULL) + return -ENXIO; + /* * we add ourselves to the task queue before buffer check * to avoid losing scan code (in case when queue is awaken somewhere @@ -773,6 +946,7 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos) } remove_wait_queue(&rbuf->wait_poll, &wait); + put_ir_rx(rx, false); set_current_state(TASK_RUNNING); dprintk("read result = %d (%s)\n", ret, ret ? "Error" : "OK"); @@ -902,17 +1076,19 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, loff_t *ppos) { struct IR *ir = filep->private_data; - struct IR_tx *tx = ir->tx; + struct IR_tx *tx; size_t i; int failures = 0; - if (tx == NULL) - return -ENODEV; - /* Validate user parameters */ if (n % sizeof(int)) return -EINVAL; + /* Get a struct IR_tx reference */ + tx = get_ir_tx(ir); + if (tx == NULL) + return -ENXIO; + /* Lock i2c bus for the duration */ mutex_lock(&ir->ir_lock); @@ -923,11 +1099,22 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, if (copy_from_user(&command, buf + i, sizeof(command))) { mutex_unlock(&ir->ir_lock); + put_ir_tx(tx, false); return -EFAULT; } /* Send boot data first if required */ if (tx->need_boot == 1) { + /* Make sure we have the 'firmware' loaded, first */ + ret = fw_load(tx); + if (ret != 0) { + mutex_unlock(&ir->ir_lock); + put_ir_tx(tx, false); + if (ret != -ENOMEM) + ret = -EIO; + return ret; + } + /* Prep the chip for transmitting codes */ ret = send_boot_data(tx); if (ret == 0) tx->need_boot = 0; @@ -939,6 +1126,7 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, (unsigned)command & 0xFFFF); if (ret == -EPROTO) { mutex_unlock(&ir->ir_lock); + put_ir_tx(tx, false); return ret; } } @@ -956,6 +1144,7 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, zilog_error("unable to send to the IR chip " "after 3 resets, giving up\n"); mutex_unlock(&ir->ir_lock); + put_ir_tx(tx, false); return ret; } set_current_state(TASK_UNINTERRUPTIBLE); @@ -969,6 +1158,9 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, /* Release i2c bus */ mutex_unlock(&ir->ir_lock); + /* Give back our struct IR_tx reference */ + put_ir_tx(tx, false); + /* All looks good */ return n; } @@ -977,12 +1169,13 @@ static ssize_t write(struct file *filep, const char *buf, size_t n, static unsigned int poll(struct file *filep, poll_table *wait) { struct IR *ir = filep->private_data; - struct IR_rx *rx = ir->rx; + struct IR_rx *rx; struct lirc_buffer *rbuf = ir->l.rbuf; unsigned int ret; dprintk("poll called\n"); + rx = get_ir_rx(ir); if (rx == NULL) { /* * Revisit this, if our poll function ever reports writeable @@ -1009,12 +1202,9 @@ static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg) { struct IR *ir = filep->private_data; int result; - unsigned long mode, features = 0; + unsigned long mode, features; - if (ir->rx != NULL) - features |= LIRC_CAN_REC_LIRCCODE; - if (ir->tx != NULL) - features |= LIRC_CAN_SEND_PULSE; + features = ir->l.features; switch (cmd) { case LIRC_GET_LENGTH: @@ -1060,19 +1250,24 @@ static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg) return result; } -/* ir_devices_lock must be held */ -static struct IR *find_ir_device_by_minor(unsigned int minor) +static struct IR *get_ir_device_by_minor(unsigned int minor) { struct IR *ir; + struct IR *ret = NULL; - if (list_empty(&ir_devices_list)) - return NULL; + mutex_lock(&ir_devices_lock); - list_for_each_entry(ir, &ir_devices_list, list) - if (ir->l.minor == minor) - return ir; + if (!list_empty(&ir_devices_list)) { + list_for_each_entry(ir, &ir_devices_list, list) { + if (ir->l.minor == minor) { + ret = get_ir_device(ir, true); + break; + } + } + } - return NULL; + mutex_unlock(&ir_devices_lock); + return ret; } /* @@ -1085,9 +1280,7 @@ static int open(struct inode *node, struct file *filep) unsigned int minor = MINOR(node->i_rdev); /* find our IR struct */ - mutex_lock(&ir_devices_lock); - ir = find_ir_device_by_minor(minor); - mutex_unlock(&ir_devices_lock); + ir = get_ir_device_by_minor(minor); if (ir == NULL) return -ENODEV; @@ -1113,6 +1306,7 @@ static int close(struct inode *node, struct file *filep) atomic_dec(&ir->open_count); + put_ir_device(ir, false); return 0; } @@ -1167,78 +1361,23 @@ static struct lirc_driver lirc_template = { .owner = THIS_MODULE, }; -static void destroy_rx_kthread(struct IR_rx *rx) -{ - /* end up polling thread */ - if (rx != NULL && !IS_ERR_OR_NULL(rx->task)) { - kthread_stop(rx->task); - rx->task = NULL; - } -} - -/* ir_devices_lock must be held */ -static int add_ir_device(struct IR *ir) -{ - list_add_tail(&ir->list, &ir_devices_list); - return 0; -} - -/* ir_devices_lock must be held */ -static void del_ir_device(struct IR *ir) -{ - struct IR *p; - - if (list_empty(&ir_devices_list)) - return; - - list_for_each_entry(p, &ir_devices_list, list) - if (p == ir) { - list_del(&p->list); - break; - } -} - static int ir_remove(struct i2c_client *client) { - struct IR *ir = i2c_get_clientdata(client); - - mutex_lock(&ir_devices_lock); - - if (ir == NULL) { - /* We destroyed everything when the first client came through */ - mutex_unlock(&ir_devices_lock); - return 0; + if (strncmp("ir_tx_z8", client->name, 8) == 0) { + struct IR_tx *tx = i2c_get_clientdata(client); + if (tx != NULL) + put_ir_tx(tx, false); + } else if (strncmp("ir_rx_z8", client->name, 8) == 0) { + struct IR_rx *rx = i2c_get_clientdata(client); + if (rx != NULL) + put_ir_rx(rx, false); } - - /* Good-bye LIRC */ - lirc_unregister_driver(ir->l.minor); - - /* Good-bye Rx */ - destroy_rx_kthread(ir->rx); - if (ir->rx != NULL) { - i2c_set_clientdata(ir->rx->c, NULL); - kfree(ir->rx); - } - - /* Good-bye Tx */ - if (ir->tx != NULL) { - i2c_set_clientdata(ir->tx->c, NULL); - kfree(ir->tx); - } - - /* Good-bye IR */ - if (ir->rbuf.fifo_initialized) - lirc_buffer_free(&ir->rbuf); - del_ir_device(ir); - kfree(ir); - - mutex_unlock(&ir_devices_lock); return 0; } /* ir_devices_lock must be held */ -static struct IR *find_ir_device_by_adapter(struct i2c_adapter *adapter) +static struct IR *get_ir_device_by_adapter(struct i2c_adapter *adapter) { struct IR *ir; @@ -1246,8 +1385,10 @@ static struct IR *find_ir_device_by_adapter(struct i2c_adapter *adapter) return NULL; list_for_each_entry(ir, &ir_devices_list, list) - if (ir->adapter == adapter) + if (ir->adapter == adapter) { + get_ir_device(ir, true); return ir; + } return NULL; } @@ -1255,6 +1396,8 @@ static struct IR *find_ir_device_by_adapter(struct i2c_adapter *adapter) static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct IR *ir; + struct IR_tx *tx; + struct IR_rx *rx; struct i2c_adapter *adap = client->adapter; int ret; bool tx_probe = false; @@ -1278,133 +1421,166 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id) mutex_lock(&ir_devices_lock); /* Use a single struct IR instance for both the Rx and Tx functions */ - ir = find_ir_device_by_adapter(adap); + ir = get_ir_device_by_adapter(adap); if (ir == NULL) { ir = kzalloc(sizeof(struct IR), GFP_KERNEL); if (ir == NULL) { ret = -ENOMEM; goto out_no_ir; } + kref_init(&ir->ref); + /* store for use in ir_probe() again, and open() later on */ INIT_LIST_HEAD(&ir->list); - ret = add_ir_device(ir); - if (ret) - goto out_free_ir; + list_add_tail(&ir->list, &ir_devices_list); ir->adapter = adap; mutex_init(&ir->ir_lock); atomic_set(&ir->open_count, 0); + spin_lock_init(&ir->tx_ref_lock); + spin_lock_init(&ir->rx_ref_lock); /* set lirc_dev stuff */ memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver)); - ir->l.minor = minor; /* module option */ - ir->l.rbuf = &ir->rbuf; - ir->l.data = ir; - ir->l.dev = &adap->dev; + /* + * FIXME this is a pointer reference to us, but no refcount. + * + * This OK for now, since lirc_dev currently won't touch this + * buffer as we provide our own lirc_fops. + * + * Currently our own lirc_fops rely on this ir->l.rbuf pointer + */ + ir->l.rbuf = &ir->rbuf; + ir->l.dev = &adap->dev; ret = lirc_buffer_init(ir->l.rbuf, ir->l.chunk_size, ir->l.buffer_size); if (ret) - goto out_free_ir; + goto out_put_ir; } if (tx_probe) { + /* Get the IR_rx instance for later, if already allocated */ + rx = get_ir_rx(ir); + /* Set up a struct IR_tx instance */ - ir->tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL); - if (ir->tx == NULL) { + tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL); + if (tx == NULL) { ret = -ENOMEM; - goto out_free_xx; + goto out_put_xx; } + kref_init(&tx->ref); + ir->tx = tx; ir->l.features |= LIRC_CAN_SEND_PULSE; - ir->tx->c = client; - ir->tx->need_boot = 1; - ir->tx->post_tx_ready_poll = + tx->c = client; + tx->need_boot = 1; + tx->post_tx_ready_poll = (id->driver_data & ID_FLAG_HDPVR) ? false : true; + + /* An ir ref goes to the struct IR_tx instance */ + tx->ir = get_ir_device(ir, true); + + /* A tx ref goes to the i2c_client */ + i2c_set_clientdata(client, get_ir_tx(ir)); + + /* + * Load the 'firmware'. We do this before registering with + * lirc_dev, so the first firmware load attempt does not happen + * after a open() or write() call on the device. + * + * Failure here is not deemed catastrophic, so the receiver will + * still be usable. Firmware load will be retried in write(), + * if it is needed. + */ + fw_load(tx); + + /* Proceed only if the Rx client is also ready or not needed */ + if (rx == NULL && !tx_only) { + zilog_info("probe of IR Tx on %s (i2c-%d) done. Waiting" + " on IR Rx.\n", adap->name, adap->nr); + goto out_ok; + } } else { + /* Get the IR_tx instance for later, if already allocated */ + tx = get_ir_tx(ir); + /* Set up a struct IR_rx instance */ - ir->rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL); - if (ir->rx == NULL) { + rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL); + if (rx == NULL) { ret = -ENOMEM; - goto out_free_xx; + goto out_put_xx; } + kref_init(&rx->ref); + ir->rx = rx; ir->l.features |= LIRC_CAN_REC_LIRCCODE; - ir->rx->c = client; - ir->rx->hdpvr_data_fmt = + rx->c = client; + rx->hdpvr_data_fmt = (id->driver_data & ID_FLAG_HDPVR) ? true : false; - } - i2c_set_clientdata(client, ir); + /* An ir ref goes to the struct IR_rx instance */ + rx->ir = get_ir_device(ir, true); - /* Proceed only if we have the required Tx and Rx clients ready to go */ - if (ir->tx == NULL || - (ir->rx == NULL && !tx_only)) { - zilog_info("probe of IR %s on %s (i2c-%d) done. Waiting on " - "IR %s.\n", tx_probe ? "Tx" : "Rx", adap->name, - adap->nr, tx_probe ? "Rx" : "Tx"); - goto out_ok; - } + /* An rx ref goes to the i2c_client */ + i2c_set_clientdata(client, get_ir_rx(ir)); - /* initialise RX device */ - if (ir->rx != NULL) { - /* try to fire up polling thread */ - ir->rx->task = kthread_run(lirc_thread, ir, - "zilog-rx-i2c-%d", adap->nr); - if (IS_ERR(ir->rx->task)) { - ret = PTR_ERR(ir->rx->task); + /* + * Start the polling thread. + * It will only perform an empty loop around schedule_timeout() + * until we register with lirc_dev and the first user open() + */ + /* An ir ref goes to the new rx polling kthread */ + rx->task = kthread_run(lirc_thread, get_ir_device(ir, true), + "zilog-rx-i2c-%d", adap->nr); + if (IS_ERR(rx->task)) { + ret = PTR_ERR(rx->task); zilog_error("%s: could not start IR Rx polling thread" "\n", __func__); - goto out_free_xx; + /* Failed kthread, so put back the ir ref */ + put_ir_device(ir, true); + /* Failure exit, so put back rx ref from i2c_client */ + i2c_set_clientdata(client, NULL); + put_ir_rx(rx, true); + ir->l.features &= ~LIRC_CAN_REC_LIRCCODE; + goto out_put_xx; + } + + /* Proceed only if the Tx client is also ready */ + if (tx == NULL) { + zilog_info("probe of IR Rx on %s (i2c-%d) done. Waiting" + " on IR Tx.\n", adap->name, adap->nr); + goto out_ok; } } /* register with lirc */ + ir->l.minor = minor; /* module option: user requested minor number */ ir->l.minor = lirc_register_driver(&ir->l); if (ir->l.minor < 0 || ir->l.minor >= MAX_IRCTL_DEVICES) { zilog_error("%s: \"minor\" must be between 0 and %d (%d)!\n", __func__, MAX_IRCTL_DEVICES-1, ir->l.minor); ret = -EBADRQC; - goto out_free_thread; - } - - /* - * if we have the tx device, load the 'firmware'. We do this - * after registering with lirc as otherwise hotplug seems to take - * 10s to create the lirc device. - */ - if (ir->tx != NULL) { - /* Special TX init */ - ret = tx_init(ir->tx); - if (ret != 0) - goto out_unregister; + goto out_put_xx; } +out_ok: + if (rx != NULL) + put_ir_rx(rx, true); + if (tx != NULL) + put_ir_tx(tx, true); + put_ir_device(ir, true); zilog_info("probe of IR %s on %s (i2c-%d) done. IR unit ready.\n", tx_probe ? "Tx" : "Rx", adap->name, adap->nr); -out_ok: mutex_unlock(&ir_devices_lock); return 0; -out_unregister: - lirc_unregister_driver(ir->l.minor); -out_free_thread: - destroy_rx_kthread(ir->rx); -out_free_xx: - if (ir->rx != NULL) { - if (ir->rx->c != NULL) - i2c_set_clientdata(ir->rx->c, NULL); - kfree(ir->rx); - } - if (ir->tx != NULL) { - if (ir->tx->c != NULL) - i2c_set_clientdata(ir->tx->c, NULL); - kfree(ir->tx); - } - if (ir->rbuf.fifo_initialized) - lirc_buffer_free(&ir->rbuf); -out_free_ir: - del_ir_device(ir); - kfree(ir); +out_put_xx: + if (rx != NULL) + put_ir_rx(rx, true); + if (tx != NULL) + put_ir_tx(tx, true); +out_put_ir: + put_ir_device(ir, true); out_no_ir: zilog_error("%s: probing IR %s on %s (i2c-%d) failed with %d\n", __func__, tx_probe ? "Tx" : "Rx", adap->name, adap->nr, |