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pcmcia: Documentation update
Fill in missing descriptions and update some others for functions in pcmcia_resource.c. Tested-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
parent
1ac71e5a35
commit
9485ee14e1
@ -6,7 +6,7 @@
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* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
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*
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* Copyright (C) 1999 David A. Hinds
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* Copyright (C) 2004-2005 Dominik Brodowski
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* Copyright (C) 2004-2010 Dominik Brodowski
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -55,6 +55,12 @@ struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
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}
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/**
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* release_io_space() - release IO ports allocated with alloc_io_space()
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* @s: pcmcia socket
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* @res: resource to release
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*
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*/
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static void release_io_space(struct pcmcia_socket *s, struct resource *res)
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{
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resource_size_t num = resource_size(res);
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@ -80,9 +86,14 @@ static void release_io_space(struct pcmcia_socket *s, struct resource *res)
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}
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}
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}
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} /* release_io_space */
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}
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/** alloc_io_space
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/**
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* alloc_io_space() - allocate IO ports for use by a PCMCIA device
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* @s: pcmcia socket
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* @res: resource to allocate (begin: begin, end: size)
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* @lines: number of IO lines decoded by the PCMCIA card
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*
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* Special stuff for managing IO windows, because they are scarce
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*/
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@ -134,7 +145,7 @@ static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
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}
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dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
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return ret;
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} /* alloc_io_space */
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}
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/**
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@ -174,7 +185,7 @@ static int pcmcia_access_config(struct pcmcia_device *p_dev,
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mutex_unlock(&s->ops_mutex);
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return ret;
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} /* pcmcia_access_config */
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}
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/**
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@ -203,6 +214,16 @@ int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
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EXPORT_SYMBOL(pcmcia_write_config_byte);
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/**
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* pcmcia_map_mem_page() - modify iomem window to point to a different offset
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* @p_dev: pcmcia device
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* @res: iomem resource already enabled by pcmcia_request_window()
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* @offset: card_offset to map
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*
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* pcmcia_map_mem_page() modifies what can be read and written by accessing
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* an iomem range previously enabled by pcmcia_request_window(), by setting
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* the card_offset value to @offset.
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*/
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int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
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unsigned int offset)
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{
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@ -221,12 +242,13 @@ int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
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dev_warn(&p_dev->dev, "failed to set_mem_map\n");
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mutex_unlock(&s->ops_mutex);
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return ret;
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} /* pcmcia_map_mem_page */
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}
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EXPORT_SYMBOL(pcmcia_map_mem_page);
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/**
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* pcmcia_fixup_iowidth() - reduce io width to 8bit
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* @p_dev: pcmcia device
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*
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* pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
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* IO width to 8bit after having called pcmcia_enable_device()
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@ -275,6 +297,8 @@ EXPORT_SYMBOL(pcmcia_fixup_iowidth);
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/**
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* pcmcia_fixup_vpp() - set Vpp to a new voltage level
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* @p_dev: pcmcia device
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* @new_vpp: new Vpp voltage
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*
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* pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
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* a new voltage level between calls to pcmcia_enable_device()
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@ -312,6 +336,17 @@ unlock:
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EXPORT_SYMBOL(pcmcia_fixup_vpp);
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/**
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* pcmcia_release_configuration() - physically disable a PCMCIA device
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* @p_dev: pcmcia device
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*
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* pcmcia_release_configuration() is the 1:1 counterpart to
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* pcmcia_enable_device(): If a PCMCIA device is no longer used by any
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* driver, the Vpp voltage is set to 0, IRQs will no longer be generated,
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* and I/O ranges will be disabled. As pcmcia_release_io() and
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* pcmcia_release_window() still need to be called, device drivers are
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* expected to call pcmcia_disable_device() instead.
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*/
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int pcmcia_release_configuration(struct pcmcia_device *p_dev)
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{
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pccard_io_map io = { 0, 0, 0, 0, 1 };
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@ -324,7 +359,7 @@ int pcmcia_release_configuration(struct pcmcia_device *p_dev)
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if (p_dev->_locked) {
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p_dev->_locked = 0;
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if (--(s->lock_count) == 0) {
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s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
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s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
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s->socket.Vpp = 0;
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s->socket.io_irq = 0;
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s->ops->set_socket(s, &s->socket);
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@ -346,16 +381,18 @@ int pcmcia_release_configuration(struct pcmcia_device *p_dev)
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mutex_unlock(&s->ops_mutex);
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return 0;
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} /* pcmcia_release_configuration */
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}
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/** pcmcia_release_io
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/**
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* pcmcia_release_io() - release I/O allocated by a PCMCIA device
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* @p_dev: pcmcia device
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*
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* Release_io() releases the I/O ranges allocated by a client. This
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* may be invoked some time after a card ejection has already dumped
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* the actual socket configuration, so if the client is "stale", we
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* don't bother checking the port ranges against the current socket
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* values.
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* pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA
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* device. This may be invoked some time after a card ejection has
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* already dumped the actual socket configuration, so if the client is
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* "stale", we don't bother checking the port ranges against the
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* current socket values.
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*/
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static int pcmcia_release_io(struct pcmcia_device *p_dev)
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{
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@ -383,10 +420,13 @@ out:
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return ret;
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} /* pcmcia_release_io */
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/**
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* pcmcia_release_window() - release reserved iomem for PCMCIA devices
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* @p_dev: pcmcia device
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* @res: iomem resource to release
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*
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* pcmcia_release_window() releases struct resource *res which was
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* pcmcia_release_window() releases &struct resource *res which was
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* previously reserved by calling pcmcia_request_window().
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*/
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int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
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@ -431,9 +471,15 @@ int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
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} /* pcmcia_release_window */
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EXPORT_SYMBOL(pcmcia_release_window);
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/**
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* pcmcia_enable_device() - set up and activate a PCMCIA device
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* @p_dev: the associated PCMCIA device
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*
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* pcmcia_enable_device() physically enables a PCMCIA device. It parses
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* the flags passed to in @flags and stored in @p_dev->flags and sets up
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* the Vpp voltage, enables the speaker line, I/O ports and store proper
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* values to configuration registers.
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*/
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int pcmcia_enable_device(struct pcmcia_device *p_dev)
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{
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@ -565,8 +611,9 @@ EXPORT_SYMBOL(pcmcia_enable_device);
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/**
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* pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
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* @p_dev: the associated PCMCIA device
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*
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* pcmcia_request_io() attepts to reserve the IO port ranges specified in
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* pcmcia_request_io() attempts to reserve the IO port ranges specified in
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* &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
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* "start" value is the requested start of the IO port resource; "end"
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* reflects the number of ports requested. The number of IO lines requested
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@ -630,11 +677,13 @@ EXPORT_SYMBOL(pcmcia_request_io);
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/**
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* pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
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* @p_dev: the associated PCMCIA device
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* @handler: IRQ handler to register
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*
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* pcmcia_request_irq() is a wrapper around request_irq which will allow
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* pcmcia_request_irq() is a wrapper around request_irq() which allows
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* the PCMCIA core to clean up the registration in pcmcia_disable_device().
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* Drivers are free to use request_irq() directly, but then they need to
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* call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
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* call free_irq() themselfves, too. Also, only %IRQF_SHARED capable IRQ
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* handlers are allowed.
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*/
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int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
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@ -657,12 +706,14 @@ EXPORT_SYMBOL(pcmcia_request_irq);
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/**
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* pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
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* @p_dev: the associated PCMCIA device
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* @handler: IRQ handler to register
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*
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* pcmcia_request_exclusive_irq() is a wrapper around request_irq which
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* pcmcia_request_exclusive_irq() is a wrapper around request_irq() which
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* attempts first to request an exclusive IRQ. If it fails, it also accepts
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* a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
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* IRQ sharing and either use request_irq directly (then they need to call
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* free_irq themselves, too), or the pcmcia_request_irq() function.
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* free_irq() themselves, too), or the pcmcia_request_irq() function.
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*/
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int __must_check
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__pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
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@ -805,10 +856,13 @@ int pcmcia_setup_irq(struct pcmcia_device *p_dev)
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/**
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* pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
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* @p_dev: the associated PCMCIA device
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* @res: &struct resource pointing to p_dev->resource[2..5]
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* @speed: access speed
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*
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* pcmcia_request_window() attepts to reserve an iomem ranges specified in
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* struct resource *res pointing to one of the entries in
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* struct pcmcia_device *p_dev->resource[2..5]. The "start" value is the
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* &struct resource @res pointing to one of the entries in
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* &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the
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* requested start of the IO mem resource; "end" reflects the size
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* requested.
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*/
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@ -900,6 +954,19 @@ int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
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} /* pcmcia_request_window */
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EXPORT_SYMBOL(pcmcia_request_window);
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/**
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* pcmcia_disable_device() - disable and clean up a PCMCIA device
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* @p_dev: the associated PCMCIA device
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*
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* pcmcia_disable_device() is the driver-callable counterpart to
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* pcmcia_enable_device(): If a PCMCIA device is no longer used,
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* drivers are expected to clean up and disable the device by calling
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* this function. Any I/O ranges (iomem and ioports) will be released,
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* the Vpp voltage will be set to 0, and IRQs will no longer be
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* generated -- at least if there is no other card function (of
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* multifunction devices) being used.
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*/
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void pcmcia_disable_device(struct pcmcia_device *p_dev)
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{
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int i;
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