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@xxxxxxxxxxxxxxxx>
---
drivers/staging/lirc/lirc_zilog.c | 582 ++++++++++++++++++++++++-------------
1 files changed, 380 insertions(+), 202 deletions(-)
diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c
index 8ab60e9..755cb39 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;
}
/*
@@ -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
@@ -1001,6 +1194,8 @@ static unsigned int poll(struct file *filep, poll_table *wait)
/* Indicate what ops could happen immediately without blocking */
ret = lirc_buffer_empty(rbuf) ? 0 : (POLLIN|POLLRDNORM);
+ put_ir_rx(rx, false);
+
dprintk("poll result = %s\n", ret ? "POLLIN|POLLRDNORM" : 0);
return ret;
}
@@ -1009,12 +1204,9 @@ 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 +1252,24 @@ 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 +1282,7 @@ 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 +1308,7 @@ static int close(struct inode *node, struct file *filep)
atomic_dec(&ir->open_count);
+ put_ir_device(ir, false);
return 0;
}
@@ -1167,78 +1363,23 @@ 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;
- }
-
- /* 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);
+ 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 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 +1387,10 @@ 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 +1398,8 @@ 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 +1423,166 @@ 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,
--
1.7.2.1
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