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SubjectRE: [2/3][PATCH][v2] TDM Framework
Date
Thanks for your comments.
Please find my response inline.

Regards,
Sandeep


-----Original Message-----
From: Russell King - ARM Linux [mailto:linux@arm.linux.org.uk]
Sent: Friday, July 27, 2012 8:22 PM
To: Singh Sandeep-B37400
Cc: linuxppc-dev@lists.ozlabs.org; linux-arm-kernel@lists.infradead.org; devel@driverdev.osuosl.org; galak@kernel.crashing.org; linux-kernel@vger.kernel.org
Subject: Re: [2/3][PATCH][v2] TDM Framework
On Fri, Jul 27, 2012 at 07:35:38PM +0530, sandeep@freescale.com wrote:
> +static DEFINE_MUTEX(tdm_core_lock);
> +static DEFINE_IDR(tdm_adapter_idr);
> +/* List of TDM adapters registered with TDM framework */
> +LIST_HEAD(adapter_list);
> +
> +/* List of TDM clients registered with TDM framework */
> +LIST_HEAD(driver_list);

These two are far too generic to be public. Have you checked your code with sparse? I think not.
[Sandeep] Will changes the name to be more appropriate. Right, I haven't checked with sparse.

> +
> +/*
> + * In case the previous data is not fetched by the client driver, the
> + * de-interleaving function will discard the old data and rewrite
> +the
> + * new data
> + */
> +
> +static int use_latest_tdm_data = 1;
> +
> +/* Data structures required for sysfs */ static struct tdm_sysfs attr
> += {
> + .attr.name = "use_latest_data",
> + .attr.mode = 0664,
> + .cmd_type = TDM_LATEST_DATA,
> +};
> +
> +static struct attribute *tdm_attr[] = {
> + &attr.attr,
> + NULL
> +};
> +
> +const struct sysfs_ops tdm_ops = {
> + .show = tdm_show_sysfs,
> + .store = tdm_store_sysfs,
> +};

Again, lack of static.
[Sandeep] Ok

> +
> +static struct kobj_type tdm_type = {
> + .sysfs_ops = &tdm_ops,
> + .default_attrs = tdm_attr,
> +};
> +
> +/* tries to match client driver with the adapter */ static int
> +tdm_device_match(struct tdm_driver *driver, struct tdm_adapter *adap)
> +{
> + /* match on an id table if there is one */
> + if (driver->id_table && driver->id_table->name[0]) {
> + if (!(strcmp(driver->id_table->name, adap->name)))
> + return (int)driver->id_table;

Casting a pointer to 'int' is not a good thing to do. Please fix this.
[Sandeep] Will fix this.

> + }
> + return 0;
> +}
> +
> +static int tdm_attach_driver_adap(struct tdm_driver *driver,
> + struct tdm_adapter *adap)
> +{
> + int ret = 0;
> + /* if driver is already attached to any other adapter, return*/
> + if (driver->adapter && (driver->adapter != adap))

Additional parens not required.
[Sandeep] Ok

> + return 0;
> +
> + driver->adapter = adap;
> +
> + if (driver->attach_adapter) {
> + ret = driver->attach_adapter(adap);
> + if (ret < 0) {
> + pr_err("tdm: attach_adapter failed for driver [%s]"
> + "err:%d\n", driver->name, ret);
> + return ret;
> + }
> + }
> + adap->drv_count++;
> +
> + if (!adap->tasklet_conf) {
> + tdm_sysfs_init();
> + tasklet_init(&adap->tdm_data_tasklet, tdm_data_tasklet_fn,
> + (unsigned long)adap);

Why not init this tasklet when the struct tdm_adapter is first created?
Why do you need to wait, and then have state tracking for this?
[Sandeep] Ok, will take care

> + adap->tasklet_conf = 1;
> + }
> +
> + return ret;
> +}
> +
> +/* Detach client driver and adapter */ static int
> +tdm_detach_driver_adap(struct tdm_driver *driver,
> + struct tdm_adapter *adap)
> +{
> + int res = 0;
> +
> + if (!driver->adapter || (driver->adapter != adap))

Additional parens not required.
[Sandeep] Ok.

> + return 0;
> +
> + adap->drv_count--;
> +
> + /* If no more driver is registed with the adapter*/
> + if (!adap->drv_count && adap->tasklet_conf) {
> + tasklet_disable(&adap->tdm_data_tasklet);
> + tasklet_kill(&adap->tdm_data_tasklet);
> + adap->tasklet_conf = 0;
> + }
> +
> + if (driver->detach_adapter) {
> + if (driver->detach_adapter(adap))
> + pr_err("tdm: detach_adapter failed for driver [%s]\n",
> + driver->name);
> + }
> +
> + driver->adapter = NULL;
> + return res;
> +}
> +
> +/* TDM adapter Registration/De-registration with TDM framework */
> +
> +static int tdm_register_adapter(struct tdm_adapter *adap) {
> + int res = 0;
> + struct tdm_driver *driver, *next;
> +
> + mutex_init(&adap->adap_lock);
> + INIT_LIST_HEAD(&adap->myports);
> + spin_lock_init(&adap->portlist_lock);
> +
> + adap->drv_count = 0;
> + adap->tasklet_conf = 0;
> +
> + list_add_tail(&adap->list, &adapter_list);

What protects this list?
[Sandeep] Ok, will take care

> +
> + /* initialization of driver by framework in default configuration */
> + init_config_adapter(adap);
> +
> + /* Notify drivers */
> + pr_info("adapter [%s] registered\n", adap->name);
> + mutex_lock(&tdm_core_lock);
> + list_for_each_entry_safe(driver, next, &driver_list, list) {
> + if (tdm_device_match(driver, adap)) {
> + res = tdm_attach_driver_adap(driver, adap);
> + if (res == 0) {
> + pr_info("tdm: Driver(ID=%d) is "
> + "attached with Adapter %s(ID"
> + " = %d)\n", driver->id,
> + adap->name, adap->id);
> + } else {
> + pr_err("tdm: Driver(ID=%d) is unable "
> + "to attach with Adapter %s(ID = %d)\n",
> + driver->id, adap->name,
> + adap->id);
> + }
> + }
> + }
> + mutex_unlock(&tdm_core_lock);
> +
> + return res;
> +}
> +
> +/*
> + * tdm_add_adapter - declare tdm adapter, use dynamic device number
> + * @adapter: the adapter to add
> + * Context: can sleep
> + *
> + * This routine is used to declare a TDM adapter
> + * When this returns zero, a new device number will be allocated and
> +stored
> + * in adap->id, and the specified adapter became available for the clients.
> + * Otherwise, a negative error number value is returned.
> + */
> +int tdm_add_adapter(struct tdm_adapter *adapter) {
> + int id, res = 0;
> +
> +retry:
> + if (idr_pre_get(&tdm_adapter_idr, GFP_KERNEL) == 0)
> + return -ENOMEM;
> +
> + mutex_lock(&tdm_core_lock);
> + res = idr_get_new(&tdm_adapter_idr, adapter, &id);
> + mutex_unlock(&tdm_core_lock);
> +
> + if (res < 0) {
> + if (res == -EAGAIN)
> + goto retry;
> + return res;
> + }
> +
> + adapter->id = id;
> + return tdm_register_adapter(adapter); }
> +EXPORT_SYMBOL(tdm_add_adapter);
> +
> +
> +/*
> + * tdm_del_adapter - unregister TDM adapter
> + * @adap: the adapter being unregistered
> + *
> + * This unregisters an TDM adapter which was previously registered
> + * by @tdm_add_adapter.
> + */
> +int tdm_del_adapter(struct tdm_adapter *adap) {
> + int res = 0;
> + struct tdm_adapter *found;
> + struct tdm_driver *driver, *next;
> +
> + /* First make sure that this adapter was ever added */
> + mutex_lock(&tdm_core_lock);
> + found = idr_find(&tdm_adapter_idr, adap->id);
> + mutex_unlock(&tdm_core_lock);
> + if (found != adap) {
> + pr_err("tdm: attempting to delete unregistered "
> + "adapter [%s]\n", adap->name);
> + return -EINVAL;
> + }
> +
> + /* disable and kill the data processing tasklet */
> + if (adap->tasklet_conf) {
> + tasklet_disable(&adap->tdm_data_tasklet);
> + tasklet_kill(&adap->tdm_data_tasklet);
> + adap->tasklet_conf = 0;
> + }
> +
> + /*
> + * Detach any active ports. This can't fail, thus we do not
> + * checking the returned value.
> + */
> + mutex_lock(&tdm_core_lock);
> + list_for_each_entry_safe(driver, next, &driver_list, list) {
> + if (tdm_device_match(driver, adap)) {
> + tdm_detach_driver_adap(driver, adap);
> + pr_info(
> + "Driver(ID=%d) is detached from Adapter %s(ID = %d)\n",
> + driver->id, adap->name, adap->id);
> + }
> + }
> + idr_remove(&tdm_adapter_idr, adap->id);
> + mutex_unlock(&tdm_core_lock);
> +
> + pr_debug("adapter [%s] unregistered\n", adap->name);
> +
> + list_del(&adap->list);

What protects this delete?
[Sandeep] Ok, will take care

> + /*
> + * Clear the device structure in case this adapter is ever going to be
> + * added again
> + */
> + adap->parent = NULL;
> +
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_del_adapter);
> +
> +/* TDM Client Drivers Registration/De-registration Functions */ int
> +tdm_register_driver(struct tdm_driver *driver) {
> + int res = 0;
> + struct tdm_adapter *adap, *next;
> +
> + list_add_tail(&driver->list, &driver_list);

What serializes this list?
[Sandeep] Ok, will take care

> +
> + mutex_lock(&tdm_core_lock);
> + /* Walk the adapters that are already present */
> + list_for_each_entry_safe(adap, next, &adapter_list, list) {
> + if (tdm_device_match(driver, adap)) {
> + res = tdm_attach_driver_adap(driver, adap);
> + if (res == 0) {
> + pr_info("TDM Driver(ID=%d)is attached with "
> + "Adapter%s(ID = %d) drv_count=%d",
> + driver->id, adap->name,
> + adap->id, adap->drv_count);
> + } else {
> + pr_err("TDM Driver(ID=%d) unable to attach "
> + "to Adapter%s(ID = %d) drv_count=%d",
> + driver->id, adap->name,
> + adap->id, adap->drv_count);
> + }
> + break;
> + }
> + }
> + mutex_unlock(&tdm_core_lock);
> +
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_register_driver);
> +
> +/*
> + * tdm_unregister_driver - unregister TDM client driver from TDM
> +framework
> + * @driver: the driver being unregistered */ void
> +tdm_unregister_driver(struct tdm_driver *driver) {
> + /*
> + * A driver can register to only one adapter,
> + * so no need to browse the list
> + */
> + mutex_lock(&tdm_core_lock);
> + tdm_detach_driver_adap(driver, driver->adapter);
> + mutex_unlock(&tdm_core_lock);
> +
> + list_del(&driver->list);

What serializes this delete?
[Sandeep] Ok, will take care

> +
> + pr_debug("tdm-core: driver [%s] unregistered\n", driver->name); }
> +EXPORT_SYMBOL(tdm_unregister_driver);
> +
> +/* Interface to the tdm device/adapter */
> +
> +/*
> + * tdm_adap_send - issue a TDM write
> + * @adap: Handle to TDM device
> + * @buf: Data that will be written to the TDM device
> + * @count: How many bytes to write
> + *
> + * Returns negative errno, or else the number of bytes written.
> + */
> +int tdm_adap_send(struct tdm_adapter *adap, void **buf, int count) {
> + int res;
> +
> + if (adap->algo->tdm_write)
> + res = adap->algo->tdm_write(adap, buf, count);
> + else {
> + pr_err("TDM level write not supported\n");

Is there no associated struct device which could be used for these error messages? What if you have more than one TDM device? It would be useful to know which is producing errors.
[Sandeep] Since this is a framework, we do not have any struct device associated. But we should work some way out to produce error messages which can be linked with specific adapter.

> + return -EOPNOTSUPP;
> + }
> +
> + /*
> + * If everything went ok (i.e. frame transmitted), return #bytes
> + * transmitted, else error code.
> + */
> + return (res == 1) ? count : res;
> +}
> +EXPORT_SYMBOL(tdm_adap_send);
> +
> +/*
> + * tdm_adap_recv - issue a TDM read
> + * @adap: Handle to TDM device
> + * @buf: Where to store data read from TDM device
> + *
> + * Returns negative errno, or else the number of bytes read.
> + */
> +int tdm_adap_recv(struct tdm_adapter *adap, void **buf) {
> + int res;
> +
> + if (adap->algo->tdm_read)
> + res = adap->algo->tdm_read(adap, (u16 **)buf);
> + else {
> + pr_err("TDM level read not supported\n");
> + return -EOPNOTSUPP;
> + }
> + /*
> + * If everything went ok (i.e. frame received), return #bytes
> + * transmitted, else error code.
> + */
> + return res;
> +}
> +
> +/*
> + * tdm_adap_get_write_buf - get next write TDM device buffer
> + * @adap: Handle to TDM device
> + * @buf: pointer to TDM device buffer
> + *
> + * Returns negative errno, or else size of the write buffer.
> + */
> +int tdm_adap_get_write_buf(struct tdm_adapter *adap, void **buf) {
> + int res;
> +
> + if (adap->algo->tdm_get_write_buf) {
> + res = adap->algo->tdm_get_write_buf(adap, (u16 **)buf);
> + } else {
> + pr_err("TDM level write buf get not supported\n");
> + return -EOPNOTSUPP;
> + }
> + /*
> + * If everything went ok (i.e. 1 msg received), return #bytes
> + * transmitted, else error code.
> + */
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_adap_get_write_buf);
> +
> +int tdm_adap_enable(struct tdm_driver *drv) {
> + int res;
> + struct tdm_adapter *adap;
> + adap = drv->adapter;

The above two lines can become one line.
[Sandeep] Sure.

> +
> + if (adap->algo->tdm_enable) {
> + res = adap->algo->tdm_enable(adap);
> + } else {
> + pr_err("TDM level enable not supported\n");
> + return -EOPNOTSUPP;
> + }
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_adap_enable);
> +
> +int tdm_adap_disable(struct tdm_driver *drv) {
> + int res;
> + struct tdm_adapter *adap;
> + adap = drv->adapter;

Ditto.
[Sandeep] Ok.

> +
> + if (adap->algo->tdm_disable) {
> + res = adap->algo->tdm_disable(adap);
> + } else {
> + pr_err("TDM level enable not supported\n");
> + return -EOPNOTSUPP;
> + }
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_adap_disable);
> +
> +struct tdm_adapter *tdm_get_adapter(int id) {
> + struct tdm_adapter *adapter;
> +
> + mutex_lock(&tdm_core_lock);
> + adapter = idr_find(&tdm_adapter_idr, id);
> + if (adapter && !try_module_get(adapter->owner))
> + adapter = NULL;
> +
> + mutex_unlock(&tdm_core_lock);
> +
> + return adapter;
> +}
> +EXPORT_SYMBOL(tdm_get_adapter);
> +
> +void tdm_put_adapter(struct tdm_adapter *adap) {
> + module_put(adap->owner);
> +}
> +EXPORT_SYMBOL(tdm_put_adapter);
> +
> +
> +/* Port Level APIs of TDM Framework */ int tdm_port_open(struct
> +tdm_driver *driver, struct tdm_port **h_port) {
> + struct tdm_port *port;
> + struct tdm_adapter *adap;
> + unsigned long flags;
> + int res = 0;
> +
> + /*
> + * This creates an anonymous tdm_port, which may later be
> + * pointed to some slot.
> + */
> + port = kzalloc(sizeof(*port), GFP_KERNEL);
> + if (!port) {
> + res = -ENOMEM;
> + return res;
> + }
> +
> + adap = tdm_get_adapter(driver->adapter->id);
> + if (!adap)
> + return -ENODEV;
> +
> + port->rx_max_frames = NUM_SAMPLES_PER_FRAME;
> + port->port_cfg.port_mode = TDM_PORT_CHANNELIZED;
> +
> + snprintf(driver->name, TDM_NAME_SIZE, "tdm-dev");
> + port->driver = driver;
> + port->adapter = adap;
> +
> + spin_lock_irqsave(&adap->portlist_lock, flags);
> + list_add_tail(&port->list, &adap->myports);
> + spin_unlock_irqrestore(&adap->portlist_lock, flags);
> +
> + INIT_LIST_HEAD(&port->mychannels);
> +
> + *h_port = port;
> + return res;
> +
> +}
> +EXPORT_SYMBOL(tdm_port_open);
> +
> +int tdm_port_close(struct tdm_port *h_port) {
> + struct tdm_adapter *adap;
> + struct tdm_driver *driver;
> + struct tdm_port *port;
> + struct tdm_channel *temp, *channel;
> + unsigned long flags;
> + int res = 0;
> + port = h_port;
> +
> + driver = port->driver;
> +
> + list_for_each_entry_safe(channel, temp, &port->mychannels, list) {
> + if (channel)
> + if (channel->in_use) {

if (channel && channel->in_use) {
> + pr_err("tdm: Cannot close port. Channel in"
> + "use\n");

Don't wrap error messages.
[Sandeep] How to handle them, it exceeds 80 character limit.

> + res = -ENXIO;
> + goto out;
> + }
> + }
> + adap = driver->adapter;
> + tdm_put_adapter(adap);
> +
> + spin_lock_irqsave(&adap->portlist_lock, flags);
> + list_del(&port->list);
> + spin_unlock_irqrestore(&adap->portlist_lock, flags);
> +
> + if (port->p_port_data != NULL) {
> + int i;
> + struct tdm_bd *ch_bd;
> +
> + /*
> + * If the tdm is in channelised mode,
> + * de-allocate the channelised buffer
> + */
> + ch_bd = &(port->p_port_data->rx_data_fifo[0]);
> + for (i = 0; ch_bd && i < TDM_CH_RX_BD_RING_SIZE; i++) {
> + ch_bd->flag = 0;
> + ch_bd++;
> + }
> + ch_bd = &(port->p_port_data->tx_data_fifo[0]);
> + for (i = 0; ch_bd && i < TDM_CH_TX_BD_RING_SIZE; i++) {
> + ch_bd->flag = 0;
> + ch_bd++;
> + }
> + kfree(port->p_port_data);
> + }
> + kfree(port);
> + return res;
> +out:
> + if (port)
> + kfree(port->p_port_data);
> + kfree(port);
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_port_close);
> +
> +int tdm_channel_read(struct tdm_port *h_port, struct tdm_channel *h_channel,
> + void *p_data, u16 *size)
> +{
> + struct tdm_channel *channel;
> + struct tdm_bd *rx_bd;
> + unsigned long flags;
> + int res = 0;
> + unsigned short *buf, *buf1;
> + channel = h_channel;
> +
> + if (!channel->p_ch_data || !channel->in_use)
> + return -EIO;
> +
> + spin_lock_irqsave(&channel->p_ch_data->rx_channel_lock, flags);
> + rx_bd = channel->p_ch_data->rx_out_data;
> +
> + if (rx_bd->flag) {
> + *size = rx_bd->length;
> + buf = (u16 *) p_data;
> + buf1 = (u16 *)rx_bd->p_data;
> + memcpy(buf1, buf, NUM_SAMPLES_PER_FRAME);
> + rx_bd->flag = 0;
> + rx_bd->offset = 0;
> + channel->p_ch_data->rx_out_data = (rx_bd->wrap) ?
> + channel->p_ch_data->rx_data_fifo : rx_bd + 1;
> +
> + } else {
> + spin_unlock_irqrestore(&channel->p_ch_data->rx_channel_lock,
> + flags);
> + pr_debug("No Data Available");
> + return -EAGAIN;
> + }
> + spin_unlock_irqrestore(&channel->p_ch_data->rx_channel_lock, flags);
> +
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_channel_read);
> +
> +
> +int tdm_channel_write(struct tdm_port *h_port, struct tdm_channel *h_channel,
> + void *p_data, u16 size)
> +{
> + struct tdm_port *port;
> + struct tdm_channel *channel;
> + struct tdm_bd *tx_bd;
> + unsigned long flags;
> + int err = 0;
> + port = h_port;
> + channel = h_channel;
> +#ifdef DEBUG
> + bool data_flag = 0;
> +#endif
> +
> + if (p_data == NULL) { /* invalid data*/
> + pr_err("tdm: Invalid Data");
> + return -EINVAL;
> + }
> +
> + if (!channel->p_ch_data || !channel->in_use)
> + return -EIO;
> +
> + spin_lock_irqsave(&channel->p_ch_data->tx_channel_lock, flags);
> + tx_bd = channel->p_ch_data->tx_in_data;
> +
> + if (!tx_bd->flag) {
> + tx_bd->length = size;
> + memcpy(tx_bd->p_data, p_data,
> + size * port->adapter->adapt_cfg.slot_width);
> + tx_bd->flag = 1;
> + tx_bd->offset = 0;
> + channel->p_ch_data->tx_in_data = (tx_bd->wrap) ?
> + channel->p_ch_data->tx_data_fifo : tx_bd+1;
> + port->port_stat.tx_pkt_count++;
> +#ifdef DEBUG
> + data_flag = 1;
> +#endif
> + } else {
> + spin_unlock_irqrestore(&channel->p_ch_data->tx_channel_lock,
> + flags);
> + port->port_stat.tx_pkt_drop_count++;
> + pr_err("tdm: Transmit failed.");
> + return -ENOMEM;
> + }
> + spin_unlock_irqrestore(&channel->p_ch_data->tx_channel_lock, flags);
> +
> +#ifdef DEBUG
> + if (data_flag) {
> + int k;
> + pr_info("\nTX port:%d - Write - Port TX-%d\n",
> + port->port_id, size);
> + for (k = 0; k < size; k++)
> + pr_info("%x", p_data[k]);
> + pr_info("\n");
> + }
> +#endif
> + return err;
> +}
> +EXPORT_SYMBOL(tdm_channel_write);
> +
> +/*
> + * Driver Function for select and poll. Based on Channel, it sleeps
> +on
> + * waitqueue
> + */
> +int tdm_ch_poll(struct tdm_channel *h_channel, unsigned int
> +wait_time) {
> + struct tdm_channel *channel;
> + channel = h_channel;
> +
> + if (!channel->p_ch_data || !channel->in_use)
> + return -EIO;
> +
> + if (channel->p_ch_data->rx_out_data->flag) {
> + pr_debug("Data Available");
> + return 0;
> + }
> + if (wait_time) {
> + unsigned long timeout = msecs_to_jiffies(wait_time);
> +
> + wait_event_interruptible_timeout(channel->ch_wait_queue,
> + channel->p_ch_data->rx_out_data->flag,
> + timeout);
> +
> + if (channel->p_ch_data->rx_out_data->flag) {
> + pr_debug("Data Available");
> + return 0;
> + }
> + }
> + return -EAGAIN;

That is incorrect. -EAGAIN is the wrong return code when
wait_event_interruptible_timeout() returns -ERESTARTSYS.
[Sandeep] Ok

> +}
> +EXPORT_SYMBOL(tdm_ch_poll);
> +
> +unsigned int tdm_port_get_stats(struct tdm_port *h_port,
> + struct tdm_port_stats *portstat)
> +{
> + struct tdm_port *port;
> + int port_num;
> + port = h_port;
> +
> + if (port == NULL || portstat == NULL) { /* invalid handle */
> + pr_err("tdm: Invalid Handle");
> + return -ENXIO;
> + }
> + port_num = port->port_id;
> +
> + memcpy(portstat, &port->port_stat, sizeof(struct tdm_port_stats));
> +
> + pr_info("TDM Port %d Get Stats", port_num);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(tdm_port_get_stats);
> +
> +/* Data handling functions */
> +
> +static int tdm_data_rx_deinterleave(struct tdm_adapter *adap) {
> + struct tdm_port *port, *next;
> + struct tdm_channel *channel, *temp;
> + struct tdm_bd *ch_bd;
> +
> + int i, buf_size, ch_data_len;
> + u16 *input_tdm_buffer;
> + u16 *pcm_buffer;
> + int slot_width;
> + int frame_ch_data_size;
> + bool ch_data;
> + int bytes_in_fifo_per_frame;
> + int bytes_slot_offset;
> +
> + ch_data_len = NUM_SAMPLES_PER_FRAME;
> + frame_ch_data_size = NUM_SAMPLES_PER_FRAME;
> + ch_data = 0;
> +
> + slot_width = adap->adapt_cfg.slot_width;
> + buf_size = tdm_adap_recv(adap, (void **)&input_tdm_buffer);
> + if (buf_size <= 0 || !input_tdm_buffer)
> + return -EINVAL;
> +
> + bytes_in_fifo_per_frame = buf_size/frame_ch_data_size;

Spaces around /
[Sandeep] Ok.

> + bytes_slot_offset = bytes_in_fifo_per_frame/slot_width;

Spaces around /
[Sandeep] Ok.

> +
> + /* de-interleaving for all ports*/
> + list_for_each_entry_safe(port, next, &adap->myports, list) {
> +
> + list_for_each_entry_safe(channel, temp, &port->mychannels,
> + list) {

Why do you need the _safe variants here? I can't see anything in this code which manipulates the lists.
[Sandeep] Will check.

> + /* if the channel is not open */
> + if (!channel->in_use || !channel->p_ch_data)
> + continue;
> + ch_bd = channel->p_ch_data->rx_in_data;
> + spin_lock(&channel->p_ch_data->rx_channel_lock);
> + /*if old data is to be discarded */
> + if (use_latest_tdm_data && ch_bd->flag) {
> + ch_bd->flag = 0;
> + ch_bd->offset = 0;
> + if (ch_bd == channel->p_ch_data->rx_out_data)
> + channel->p_ch_data->rx_out_data =
> + ch_bd->wrap ?
> + channel->p_ch_data->rx_data_fifo
> + : ch_bd+1;
> + port->port_stat.rx_pkt_drop_count++;
> + }
> + /* if the bd is empty */
> + if (!ch_bd->flag) {
> + if (ch_bd->offset == 0)
> + ch_bd->length = port->rx_max_frames;
> +
> + pcm_buffer = ch_bd->p_data + ch_bd->offset;
> + /* De-interleaving the data */
> + for (i = 0; i < ch_data_len; i++) {
> + pcm_buffer[i]
> + = input_tdm_buffer[i*
> + bytes_slot_offset +
> + channel->ch_id];
> + }
> + ch_bd->offset += ch_data_len * slot_width;
> +
> + if (ch_bd->offset >=
> + (ch_bd->length -
> + frame_ch_data_size)*
> + (adap->adapt_cfg.slot_width)) {
> + ch_bd->flag = 1;
> + ch_bd->offset = 0;
> + channel->p_ch_data->rx_in_data =
> + ch_bd->wrap ?
> + channel->p_ch_data->rx_data_fifo
> + : ch_bd+1;
> + ch_data = 1;
> + wake_up_interruptible
> + (&channel->ch_wait_queue);
> + }
> + } else {
> + port->port_stat.rx_pkt_drop_count++;
> + }
> + spin_unlock(&channel->p_ch_data->rx_channel_lock);
> + }
> +
> + if (ch_data) {
> + /* Wake up the Port Data Poll event */
> +#ifdef DEBUG
> + pr_info("Port RX-%d-%d\n", channel->ch_id, ch_data_len);
> + for (i = 0; i < ch_data_len; i++)
> + pr_info("%x", pcm_buffer[i]);
> + pr_info("\n");
> +#endif
> + port->port_stat.rx_pkt_count++;
> + ch_data = 0;
> + }
> + }
> + return 0;
> +}
> +
> +static int tdm_data_tx_interleave(struct tdm_adapter *adap) {
> + struct tdm_port *port, *next;
> + struct tdm_channel *channel, *temp;
> + struct tdm_bd *ch_bd;
> + int i, buf_size, ch_data_len = NUM_SAMPLES_PER_FRAME;
> + bool last_data = 0;
> + u16 *output_tdm_buffer;
> + u16 *pcm_buffer;
> + int frame_ch_data_size = NUM_SAMPLES_PER_FRAME;
> + int bytes_in_fifo_per_frame;
> + int bytes_slot_offset;
> +
> +#ifdef DEBUG
> + u8 data_flag = 0;
> +#endif
> +
> + buf_size = tdm_adap_get_write_buf(adap, (void **)&output_tdm_buffer);
> + if (buf_size <= 0 || !output_tdm_buffer)
> + return -EINVAL;
> +
> + bytes_in_fifo_per_frame = buf_size/frame_ch_data_size;
> + bytes_slot_offset =
> +bytes_in_fifo_per_frame/adap->adapt_cfg.slot_width;
> +
> +
> + memset(output_tdm_buffer, 0, sizeof(buf_size));
> +
> + list_for_each_entry_safe(port, next, &adap->myports, list) {
> +
> + list_for_each_entry_safe(channel, temp, &port->mychannels,
> + list) {

Why do you need the _safe variants here? I can't see anything in this code which manipulates the lists.
[Sandeep] Will check.

> + pr_debug("TX-Tdm %d (slots-)", channel->ch_id);
> +
> +
> + /* if the channel is open */
> + if (!channel->in_use || !channel->p_ch_data)
> + continue;
> +
> + spin_lock(&channel->p_ch_data->tx_channel_lock);
> + if (!channel->in_use || !channel->p_ch_data)
> + continue;
> + ch_bd = channel->p_ch_data->tx_out_data;
> + if (ch_bd->flag) {
> + pcm_buffer = (u16 *)((uint8_t *)ch_bd->p_data +
> + ch_bd->offset);
> + /* if the buffer has less frames than required*/

Space before */
[Sandeep] Ok

> + if (frame_ch_data_size >=
> + (ch_bd->length - ch_bd->offset/

Space before /
[Sandeep] Ok

> + adap->adapt_cfg.slot_width)) {
> + ch_data_len =
> + ch_bd->length - ch_bd->offset/

Space before /
[Sandeep] Ok

> + adap->adapt_cfg.slot_width;

Wrong indentation. If you're finding the 80 column limit is causing problems, you have too much code in this function (read Documentation/CodingStyle again).
[Sandeep] Ok.

> + last_data = 1;
> + } else {
> + ch_data_len = frame_ch_data_size;
> + }
> + /* Interleaving the data */
> + for (i = 0; i < ch_data_len; i++) {
> + /*
> + * TODO- need to be genric for any size
> + * assignment
> + */
> + output_tdm_buffer[channel->ch_id +
> + bytes_slot_offset * i] =
> + pcm_buffer[i];
> + }
> + /*
> + * If all the data of this buffer is
> + * transmitted
> + */
> + if (last_data) {
> + ch_bd->flag = 0;
> + ch_bd->offset = 0;
> + channel->p_ch_data->tx_out_data =
> + ch_bd->wrap ?
> + channel->p_ch_data->tx_data_fifo
> + : ch_bd+1;

Spaces around +
[Sandeep] Ok

> + port->port_stat.tx_pkt_conf_count++;
> + } else {
> + ch_bd->offset += ch_data_len *
> + (adap->adapt_cfg.slot_width);
> + }
> +#ifdef DEBUG
> + data_flag = 1;
> +#endif
> + }
> + spin_unlock(&channel->p_ch_data->tx_channel_lock);
> + }
> + }
> +
> +#ifdef DEBUG
> + if (data_flag) {
> + pr_info("TX-TDM Interleaved Data-\n");
> + for (i = 0; i < 64; i++)
> + pr_info("%x", output_tdm_buffer[i]);
> + pr_info("\n");
> + }
> +#endif
> + return 0;
> +}
> +
> +/* Channel Level APIs of TDM Framework */ int tdm_channel_open(u16
> +chanid, u16 ch_width, struct tdm_port *port,
> + struct tdm_channel **h_channel)
> +{
> + struct tdm_channel *channel, *temp;
> + unsigned long flags;
> + struct tdm_ch_data *p_ch_data;
> + int res = 0;
> +
> + if (ch_width != 1) {
> + pr_err("tdm: Mode not supported\n");
> + return -EINVAL;
> + }
> +
> + list_for_each_entry_safe(channel, temp, &port->mychannels, list) {
> + if (channel->ch_id == chanid) {
> + pr_err("tdm: Channel %d already open\n", chanid);
> + return -EINVAL;
> + }
> + }
> +
> + channel = kzalloc(sizeof(*channel), GFP_KERNEL);
> + if (!channel) {
> + res = -ENOMEM;
> + goto out;
> + }
> +
> + init_waitqueue_head(&channel->ch_wait_queue);
> + p_ch_data = kzalloc(sizeof(struct tdm_ch_data), GFP_KERNEL);
> + if (!p_ch_data) {
> + res = -ENOMEM;
> + goto outdata;
> + }
> +
> + p_ch_data->rx_data_fifo[TDM_CH_RX_BD_RING_SIZE-1].wrap = 1;
> + p_ch_data->tx_data_fifo[TDM_CH_TX_BD_RING_SIZE-1].wrap = 1;
> +
> + p_ch_data->rx_in_data = p_ch_data->rx_data_fifo;
> + p_ch_data->rx_out_data = p_ch_data->rx_data_fifo;
> + p_ch_data->tx_in_data = p_ch_data->tx_data_fifo;
> + p_ch_data->tx_out_data = p_ch_data->tx_data_fifo;
> + spin_lock_init(&p_ch_data->rx_channel_lock);
> + spin_lock_init(&p_ch_data->tx_channel_lock);
> +
> + channel->p_ch_data = p_ch_data;
> +
> + channel->ch_id = chanid;
> + channel->ch_cfg.first_slot = chanid;
> + channel->ch_cfg.num_slots = 1; /*
> + * This is 1 for channelized mode and
> + * configurable for other modes
> + */
> + channel->port = port;
> + channel->in_use = 1;
> +
> + spin_lock_irqsave(&port->ch_list_lock, flags);
> + list_add_tail(&channel->list, &port->mychannels);
> + spin_unlock_irqrestore(&port->ch_list_lock, flags);
> +
> + *h_channel = channel;
> +
> + return res;
> +
> +outdata:
> + kfree(channel);
> +out:
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_channel_open);
> +
> +int tdm_sysfs_init(void)

static?
[Sandeep] Ok.

> +{
> + struct kobject *tdm_kobj;
> + int err = 1;
> + tdm_kobj = kzalloc(sizeof(*tdm_kobj), GFP_KERNEL);
> + if (tdm_kobj) {
> + kobject_init(tdm_kobj, &tdm_type);
> + if (kobject_add(tdm_kobj, NULL, "%s", "tdm")) {
> + pr_err("tdm: Sysfs creation failed\n");
> + kobject_put(tdm_kobj);
> + err = -EINVAL;
> + goto out;
> + }
> + } else {
> + pr_err("tdm: Unable to allocate tdm_kobj\n");
> + err = -ENOMEM;
> + goto out;
> + }

What if this function gets called multiple times? It looks like
kobject_add() will fail due to name conflicts.

Also, what's the point of the above? I looks like the kobject is never used.
[Sandeep] Will check.

> +
> +out:
> + return err;
> +}
> +
> +int tdm_channel_close(u16 chanid, u16 ch_width, struct tdm_port *port,
> + struct tdm_channel *h_channel)
> +{
> + struct tdm_channel *channel;
> + unsigned long flags;
> + int res = 0;
> + channel = h_channel;
> +
> + spin_lock_irqsave(&port->ch_list_lock, flags);
> + list_del(&channel->list);
> + spin_unlock_irqrestore(&port->ch_list_lock, flags);
> +
> + if (channel)
> + kfree(channel->p_ch_data);
> + kfree(channel);
> + return res;
> +}
> +EXPORT_SYMBOL(tdm_channel_close);
> +
> +ssize_t tdm_show_sysfs(struct kobject *kobj,
> + struct attribute *attr, char *buf)
> +{
> + int retval = 0;
> + struct tdm_sysfs *a = container_of(attr,
> + struct tdm_sysfs, attr);
> + switch (a->cmd_type) {
> + case TDM_LATEST_DATA:
> + pr_info("use_latest_tdm_data: %d\n", use_latest_tdm_data);
> + break;
> + default:
> + pr_info("Invalid cmd_type value\n");
> + return -EINVAL;
> + }
> + return retval;
> +}
> +
> +ssize_t tdm_store_sysfs(struct kobject *kobj,
> + struct attribute *attr, const char *buf, size_t len) {
> + struct tdm_sysfs *a = container_of(attr,
> + struct tdm_sysfs, attr);
> +
> + sscanf(buf, "%d", &a->data);
> + use_latest_tdm_data = a->data;
> + return strlen(buf);
> +}
> +
> +void init_config_adapter(struct tdm_adapter *adap) {
> + struct fsl_tdm_adapt_cfg default_adapt_cfg = {
> + .loopback = TDM_PROCESS_NORMAL,
> + .num_ch = NUM_CHANNELS,
> + .ch_size_type = CHANNEL_16BIT_LIN,
> + .frame_len = NUM_SAMPLES_PER_FRAME,
> + .num_frames = NUM_SAMPLES_PER_FRAME,
> + .adap_mode = TDM_ADAPTER_MODE_NONE
> + };
> +
> + default_adapt_cfg.slot_width = default_adapt_cfg.ch_size_type/3 + 1;

Spaces around /
[Sandeep] Ok

> +
> + memcpy(&adap->adapt_cfg, &default_adapt_cfg,
> + sizeof(struct fsl_tdm_adapt_cfg));

If this is supposed to be a generic layer, why the fsl_ data in core code?
[Sandeep] It's because framework initializes adapter in a default configuration and then passes it to the adapter.

> +
> + return;
> +}
> +EXPORT_SYMBOL(init_config_adapter);
> +
> +void tdm_data_tasklet_fn(unsigned long data)

static?
[Sandeep] Ok

> +{
> + struct tdm_adapter *adapter;
> + adapter = (struct tdm_adapter *)data;
> + if (adapter != NULL) {
> + tdm_data_tx_interleave(adapter);
> + tdm_data_rx_deinterleave(adapter);
> + }
> +}

A general comment: it is better to place functions before their first use where possible.
[Sandeep] Alright.

> +
> +
> +MODULE_AUTHOR("Hemant Agrawal <hemant@freescale.com> and "
> + "Rajesh Gumasta <rajesh.gumasta@freescale.com>");
> +MODULE_DESCRIPTION("TDM Driver Framework Core");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mod_devicetable.h
> b/include/linux/mod_devicetable.h index 83ac071..573ac40 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -425,6 +425,17 @@ struct i2c_device_id {
> __attribute__((aligned(sizeof(kernel_ulong_t))));
> };
>
> +/* tdm */
> +
> +#define TDM_NAME_SIZE 20
> +#define TDM_MODULE_PREFIX "tdm:"
> +
> +struct tdm_device_id {
> + char name[TDM_NAME_SIZE];
> + kernel_ulong_t driver_data /* Data private to the driver */
> + __attribute__((aligned(sizeof(kernel_ulong_t))));
> +};
> +
> /* spi */
>
> #define SPI_NAME_SIZE 32
> diff --git a/include/linux/tdm.h b/include/linux/tdm.h new file mode
> 100644 index 0000000..44cd8cf
> --- /dev/null
> +++ b/include/linux/tdm.h
> @@ -0,0 +1,389 @@
> +/* include/linux/tdm.h
> + *
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + *
> + * tdm.h - definitions for the tdm-device framework interface
> + *
> + * Author:Hemant Agrawal <hemant@freescale.com>
> + * Rajesh Gumasta <rajesh.gumasta@freescale.com>
> + *
> + * This program is free software; you can redistribute it and/or
> +modify it
> + * under the terms of the GNU General Public License as published
> +by the
> + * Free Software Foundation; either version 2 of the License, or
> +(at your
> + * option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> +but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> +along
> + * with this program; if not, write to the Free Software Foundation,
> +Inc.,
> + * 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +
> +#ifndef _LINUX_TDM_H
> +#define _LINUX_TDM_H
> +
> +#include <linux/types.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/device.h> /* for struct device */
> +#include <linux/sched.h> /* for completion */
> +#include <linux/mutex.h>
> +#include <linux/interrupt.h>
> +#include <linux/sysfs.h>
> +
> +#define TDM_LATEST_DATA 1
> +#define CHANNEL_8BIT_LIN 0 /* 8 bit linear */
> +#define CHANNEL_8BIT_ULAW 1 /* 8 bit Mu-law */
> +#define CHANNEL_8BIT_ALAW 2 /* 8 bit A-law */
> +#define CHANNEL_16BIT_LIN 3 /* 16 bit Linear */
> +
> +/*
> + * Default adapter configuration. All the TDM adapters registered
> +with
> + * framework will be configured with following default configuration.
> + */
> +#define NUM_CHANNELS 16
> +
> +/*
> + * Default configuration for typical voice data sample. These
> +parameters
> + * will generally not be required to be changed for voice type applications.
> + */
> +
> +/* 8 samples per milli sec per channel. Req for voice data */
> +#define NUM_SAMPLES_PER_MS 8
> +#define NUM_MS 10
> +
> +/* Number of samples for 1 client buffer */
> +#define NUM_SAMPLES_PER_FRAME (NUM_MS * NUM_SAMPLES_PER_MS)
> +#define NUM_OF_TDM_BUF 3
> +
> +/* General options */
> +
> +struct tdm_adapt_algorithm;
> +struct tdm_adapter;
> +struct tdm_port;
> +
> +
> +/*
> + * struct tdm_driver - represent an TDM device driver
> + * @class: What kind of tdm device we instantiate (for detect)
> + * @id:Driver id
> + * @name: Name of the driver
> + * @attach_adapter: Callback for device addition (for legacy drivers)
> + * @detach_adapter: Callback for device removal (for legacy drivers)
> + * @probe: Callback for device binding
> + * @remove: Callback for device unbinding
> + * @shutdown: Callback for device shutdown
> + * @suspend: Callback for device suspend
> + * @resume: Callback for device resume
> + * @command: Callback for sending commands to device
> + * @id_table: List of TDM devices supported by this driver
> + * @list: List of drivers created (for tdm-core use only) */ struct
> +tdm_driver {
> + unsigned int class;
> + unsigned int id;
> + char name[TDM_NAME_SIZE];
> +
> + int (*attach_adapter)(struct tdm_adapter *);
> + int (*detach_adapter)(struct tdm_adapter *);
> +
> + /* Standard driver model interfaces */
> + int (*probe)(const struct tdm_device_id *);
> + int (*remove)(void);
> +
> + /* driver model interfaces that don't relate to enumeration */
> + void (*shutdown)(void);
> + int (*suspend)(pm_message_t mesg);
> + int (*resume)(void);

Far better to use the dev_pm_ops stuff now, don't propagate the old PM interfaces.
[Sandeep] Ok.

> +
> + const struct tdm_device_id *id_table;
> +
> + /* The associated adapter for this driver */
> + struct tdm_adapter *adapter;
> + struct list_head list;
> +};
> +
> +/*
> + * tdm per port statistics structure, used for providing and storing
> +tdm port
> + * statistics.
> + */
> +struct tdm_port_stats {
> + unsigned int rx_pkt_count; /* Rx frame count per channel */
> + unsigned int rx_pkt_drop_count; /*
> + * Rx drop count per channel to
> + * clean space for new buffer
> + */
> + unsigned int tx_pkt_count; /* Tx frame count per channel */
> + unsigned int tx_pkt_conf_count; /*
> + * Tx frame confirmation count per
> + * channel
> + */
> + unsigned int tx_pkt_drop_count; /*
> + * Tx drop count per channel due to
> + * queue full
> + */
> +};
> +
> +
> +/*
> + * tdm Buffer Descriptor, used for Creating Interleaved and
> +De-interleaved
> + * FIFOs
> + */
> +struct tdm_bd {
> + unsigned char flag; /* BD is full or empty */
> + unsigned char wrap; /* BD is last in the queue */
> + unsigned short length; /* Length of data in BD */
> + /*TODO: use dyanmic memory */
> + unsigned short p_data[NUM_SAMPLES_PER_FRAME]; /* Data Pointer */
> + unsigned long offset; /* Offset of the Data Pointer to be used */
> +};
> +
> +#define TDM_CH_RX_BD_RING_SIZE 3
> +#define TDM_CH_TX_BD_RING_SIZE 3
> +
> +/* tdm RX-TX Channelised Data */
> +struct tdm_port_data {
> + struct tdm_bd rx_data_fifo[TDM_CH_RX_BD_RING_SIZE]; /*
> + * Rx Channel Data
> + * BD Ring
> + */
> + struct tdm_bd *rx_in_data; /*
> + * Current Channel Rx BD to be filled by
> + * de-interleave function
> + */
> + struct tdm_bd *rx_out_data; /*
> + * Current Channel Rx BD to be
> + * read by App
> + */
> + struct tdm_bd tx_data_fifo[TDM_CH_TX_BD_RING_SIZE]; /*
> + * Tx Channel Data
> + * BD Ring
> + */
> + struct tdm_bd *tx_in_data; /*
> + * Current Channel Tx BD to be
> + * filled by App
> + */
> + struct tdm_bd *tx_out_data; /*
> + * Current Channel Tx BD to be read by
> + * interleave function
> + */
> + spinlock_t rx_channel_lock; /* Spin Lock for Rx Channel */
> + spinlock_t tx_channel_lock; /* Spin Lock for Tx Channel */
> +};
> +
> +/* structure tdm_port_cfg - contains configuration params for a port
> +*/ struct tdm_port_cfg {
> + unsigned short port_mode;
> +};
> +
> +/* struct tdm_port - represent an TDM ports for a device */ struct
> +tdm_port {
> + unsigned short port_id;
> + unsigned short in_use; /* Port is enabled? */
> + uint16_t rx_max_frames; /*
> + * Received port frames before allowing
> + * read operation in Port Mode
> + */
> +
> + struct tdm_port_stats port_stat; /*
> + * A structure parameter defining
> + * TDM port statistics.
> + */
> + struct tdm_port_data *p_port_data; /*
> + * a structure parameter
> + * defining tdm channelised data
> + */
> +
> + struct tdm_driver *driver; /* driver for this port */
> + struct tdm_adapter *adapter; /* adapter for this port */
> + struct list_head list; /* list of ports */
> + struct list_head mychannels; /* list of channels, on this port*/
> + spinlock_t ch_list_lock; /* Spin Lock for channel_list */
> + struct tdm_port_cfg port_cfg; /*
> + * A structure parameter defining
> + * TDM port configuration.
> + */
> +};
> +
> +/* tdm RX-TX Channelised Data */
> +struct tdm_ch_data {
> + struct tdm_bd rx_data_fifo[TDM_CH_RX_BD_RING_SIZE]; /*
> + * Rx Port Data BD
> + * Ring
> + */
> + struct tdm_bd *rx_in_data; /*
> + * Current Port Rx BD to be filled by
> + * de-interleave function
> + */
> + struct tdm_bd *rx_out_data; /* Current Port Rx BD to be read by App */
> + struct tdm_bd tx_data_fifo[TDM_CH_TX_BD_RING_SIZE]; /*
> + * Tx Port Data BD
> + * Ring
> + */
> + struct tdm_bd *tx_in_data; /*
> + * Current Port Tx BD to be filled by
> + * App
> + */
> + struct tdm_bd *tx_out_data; /*
> + * Current Port Tx BD to be read by
> + * interleave function
> + */
> + spinlock_t rx_channel_lock; /* Spin Lock for Rx Port */
> + spinlock_t tx_channel_lock; /* Spin Lock for Tx Port */
> +};
> +
> +/* Channel config params */
> +struct tdm_ch_cfg {
> + unsigned short num_slots;
> + unsigned short first_slot;
> +};
> +
> +/* struct tdm_channel- represent a TDM channel for a port */ struct
> +tdm_channel {
> + u16 ch_id; /* logical channel number */
> + struct list_head list; /* list of channels in a port*/
> + struct tdm_port *port; /* port for this channel */
> + u8 in_use; /* channel is enabled? */
> + struct tdm_ch_cfg ch_cfg; /* channel configuration */
> + struct tdm_ch_data *p_ch_data; /* data storage space for channel */
> + wait_queue_head_t ch_wait_queue;/* waitQueue for RX Channel Data */
> +};
> +
> +/* tdm_adapt_algorithm is for accessing the routines of device */
> +struct tdm_adapt_algorithm {
> + int (*tdm_read)(struct tdm_adapter *, u16 **);
> + int (*tdm_get_write_buf)(struct tdm_adapter *, u16 **);
> + int (*tdm_write)(struct tdm_adapter *, void *, unsigned int len);
> + int (*tdm_enable)(struct tdm_adapter *);
> + int (*tdm_disable)(struct tdm_adapter *); };
> +
> +/* tdm_adapter_mode is to define in mode of the device */ enum
> +tdm_adapter_mode {
> + TDM_ADAPTER_MODE_NONE = 0x00,
> + TDM_ADAPTER_MODE_T1 = 0x01,
> + TDM_ADAPTER_MODE_E1 = 0x02,
> + TDM_ADAPTER_MODE_T1_RAW = 0x10,
> + TDM_ADAPTER_MODE_E1_RAW = 0x20,
> +};
> +
> +/* tdm_port_mode defines the mode in which the port is configured to
> +operate
> + * It can be channelized/full/fractional.
> + */
> +enum tdm_port_mode {
> + TDM_PORT_CHANNELIZED = 0, /* Channelized mode */
> + TDM_PORT_FULL = 1, /* Full mode */
> + TDM_PORT_FRACTIONAL = 2 /* Fractional mode */
> +};
> +
> +/* tdm_process_mode used for testing the tdm device in normal mode or
> +internal
> + * loopback or external loopback
> + */
> +enum tdm_process_mode {
> + TDM_PROCESS_NORMAL = 0, /* Normal mode */
> + TDM_PROCESS_INT_LPB = 1, /* Internal loop mode */
> + TDM_PROCESS_EXT_LPB = 2 /* External Loopback mode */
> +};
> +
> +/* TDM configuration parameters */
> +struct fsl_tdm_adapt_cfg {
> + u8 num_ch; /* Number of channels in this adpater */
> + u8 ch_size_type; /*
> + * reciever/transmit channel
> + * size for all channels
> + */
> + u8 slot_width; /* 1 or 2 Is defined by channel type */
> + u8 frame_len; /* Length of frame in samples */
> + u32 num_frames;
> + u8 loopback; /* loopback or normal */
> + u8 adap_mode; /*
> + * 0=None, 1= T1, 2= T1-FULL, 3=E1,
> + * 4 = E1-FULL
> + */
> + int max_timeslots; /*
> + * Max Number of timeslots that are
> + * supported on this adapter
> + */
> +};
> +
> +/*
> + * tdm_adapter is the structure used to identify a physical tdm
> +device along
> + * with the access algorithms necessary to access it.
> + */
> +struct tdm_adapter {
> + struct module *owner; /* owner of the adapter module */
> + unsigned int id; /* Adapter Id */
> + unsigned int drv_count; /*
> + * Number of drivers associated with the
> + * adapter
> + */
> + const struct tdm_adapt_algorithm *algo; /*
> + * algorithm to access the
> + * adapter
> + */
> +
> + char name[TDM_NAME_SIZE]; /* Name of Adapter */
> + struct mutex adap_lock;
> + struct device *parent;
> +
> + struct tasklet_struct tdm_data_tasklet; /*
> + * tasklet handle to perform
> + * data processing
> + */
> + int tasklet_conf; /* flag for tasklet configuration */
> + int tdm_rx_flag;
> +
> + struct list_head myports; /*
> + * list of ports, created on this
> + * adapter
> + */
> + struct list_head list;
> + spinlock_t portlist_lock;
> + void *data;
> + struct fsl_tdm_adapt_cfg adapt_cfg;
> +};
> +
> +struct tdm_sysfs {
> + struct attribute attr;
> + int data;
> + u32 cmd_type;
> +};
> +
> +/* functions exported by tdm.o */
> +
> +int tdm_add_adapter(struct tdm_adapter *adpater); int
> +tdm_del_adapter(struct tdm_adapter *adapter); int
> +tdm_register_driver(struct tdm_driver *driver); void
> +tdm_unregister_driver(struct tdm_driver *driver); void
> +init_config_adapter(struct tdm_adapter *adapter);
> +
> +int tdm_port_open(struct tdm_driver *driver, struct tdm_port
> +**h_port); int tdm_port_close(struct tdm_port *h_port); int
> +tdm_channel_read(struct tdm_port *h_port, struct tdm_channel *h_channel,
> + void *p_data, u16 *size);
> +int tdm_channel_write(struct tdm_port *h_port, struct tdm_channel *h_channel,
> + void *p_data, u16 size);
> +int tdm_ch_poll(struct tdm_channel *h_channel, unsigned int
> +wait_time);
> +
> +int tdm_channel_open(u16 chanid, u16 ch_width, struct tdm_port *port,
> + struct tdm_channel **h_channel);
> +int tdm_channel_close(u16 chanid, u16 ch_width, struct tdm_port *port,
> + struct tdm_channel *h_channel);
> +/* this tasklet is created for each adapter instance */ void
> +tdm_data_tasklet_fn(unsigned long); int tdm_sysfs_init(void); ssize_t
> +tdm_show_sysfs(struct kobject *kobj,
> + struct attribute *attr, char *buf); ssize_t tdm_store_sysfs(struct
> +kobject *kobj,
> + struct attribute *attr, const char *buf, size_t len);
> +
> +struct tdm_adapter *tdm_get_adapter(int id); void
> +tdm_put_adapter(struct tdm_adapter *adap);
> +
> +#endif /* __KERNEL__ */
> +
> +#define TDM_E_OK 0
> --
> 1.5.6.5
>
>
>
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> linux-arm-kernel@lists.infradead.org
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