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2009-11-03at91: at91sam9g45 family: identify several chip versionsNicolas Ferre
cpu_is_xxx() macros are identifying generic at91sam9g45 chip. This patch adds the capacity to differentiate Engineering Samples and final lots through the inclusion of at91_cpu_fully_identify() and the related chip IDs with chip version field preserved. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
2009-11-03avr32: add two new at91 to cpu.h definitionNicolas Ferre
Somme common drivers will need those at91 cpu_is_xxx() definitions. As at91sam9g10 and at91sam9g45 are on the way to linus' tree, here is the patch that adds those chips to cpu.h in AVR32 architecture. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-06-03avr32: Fix clash in ATMEL_USART_ flagsBen Nizette
At the moment ATMEL_USART_{RTS,CTS,CLK} have the values 1, 2 and 3 respectively. Given these are used in bitmasks, trying to turn on the CLK line will in fact turn on the RTS and CTS lines as well. Change the value of ATMEL_USART_CLK to 4. Signed-off-by: Ben Nizette <bn@niasdigital.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-04-07dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)Yang Hongyang
Replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-01avr32: add RTS/CTS/CLK pin selection for the USARTsPeter Ma
Adds extra parameter to AT32 at32_map_usart(), so as to reserve RTS/CTS/CLK pins. All boards under arch/avr32/boards have been updated (trivial change), but not all have been tested. Signed-off-by: Peter Ma <pma@mediamatech.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-03-27avr32: at32ap700x: setup DMA for AC97C in the machine codeHans-Christian Egtvedt
This patch will adjust the setup the DMA controller for the AC97 Controller in the at32ap700x machine code. This setup matches the new ALSA driver for the AC97C. The struct ac97c_platform_data has been moved into its own header file located in the sound include path. Tested on ATSTK1006 + ATSTK1000. This patch will setup the AC97 controller properly for the adjusted machine code. Both EVKLCD10x and Hammerhead board has been updated. Tested on EVKLCD10x, and copied to Hammerhead board. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> [haavard.skinnemoen@atmel.com: fold with board code update] Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-03-27avr32: at32ap700x: setup DMA for ABDAC in the machine codeHans-Christian Egtvedt
This patch will adjust the setup the DMA controller for the Audio Bistream DAC in the at32ap700x machine code. This setup matches the new ALSA driver for the ABDAC. Tested on ATSTK1006 + ATSTK1000. This patch will setup the needed platform data for the Audio Bistream DAC used by the Favr-32 board. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> [haavard.skinnemoen@atmel.com: fold board code update] Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-03-27Merge branch 'master' of ↵Haavard Skinnemoen
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into avr32-arch
2009-03-26avr32: use gpio_is_valid() to check USBA vbus_pin I/O lineHans-Christian Egtvedt
This patch will use gpio_is_valid() to check the vbus_pin I/O line. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-03-26avr32: add pin mask for 18-bit color on the LCD controllerHans-Christian Egtvedt
This patch adds two defines for setting a pin mask for 18-bit LCD panels connected to the LCD controller. One mask for primary output and one mask for alternative output. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-03-26avr32: fix 15-bit LCDC pin mask to use MSB linesHans-Christian Egtvedt
This patch corrects the 15-bit LCDC pin mask definitions to select the five upper lines in each color byte from the LCDC data output. When reducing the color depth the LCDC will start filling MSB and downwards. Also only enable 5 bits per color as the define indicates. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-02-16[ARM] 5400/1: Add support for inverted rdy_busy pin for Atmel nand device ↵Gregory CLEMENT
controller Add support for inverted rdy_busy pin for Atmel nand device controller It will fix building error on NeoCore926 board. Acked-by: Andrew Victor <linux@maxim.org.za> Acked-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Gregory CLEMENT <gclement@adeneo.adetelgroup.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-01-09Merge branch 'next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (22 commits) ioat: fix self test for multi-channel case dmaengine: bump initcall level to arch_initcall dmaengine: advertise all channels on a device to dma_filter_fn dmaengine: use idr for registering dma device numbers dmaengine: add a release for dma class devices and dependent infrastructure ioat: do not perform removal actions at shutdown iop-adma: enable module removal iop-adma: kill debug BUG_ON iop-adma: let devm do its job, don't duplicate free dmaengine: kill enum dma_state_client dmaengine: remove 'bigref' infrastructure dmaengine: kill struct dma_client and supporting infrastructure dmaengine: replace dma_async_client_register with dmaengine_get atmel-mci: convert to dma_request_channel and down-level dma_slave dmatest: convert to dma_request_channel dmaengine: introduce dma_request_channel and private channels net_dma: convert to dma_find_channel dmaengine: provide a common 'issue_pending_all' implementation dmaengine: centralize channel allocation, introduce dma_find_channel dmaengine: up-level reference counting to the module level ...
2009-01-06atmel-mci: convert to dma_request_channel and down-level dma_slaveDan Williams
dma_request_channel provides an exclusive channel, so we no longer need to pass slave data through dmaengine. Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-01-05Merge branch 'move-atmel-mci-h' into boardsHaavard Skinnemoen
2009-01-05atmel-mci: move atmel-mci.h file to include/linuxNicolas Ferre
Needed to use the atmel-mci driver in an architecture independant maner. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-01-05avr32: Hammerhead board supportAlex Raimondi
The Hammerhead platform is built around a AVR32 32-bit microcontroller from Atmel. It offers versatile peripherals, such as ethernet, usb device, usb host etc. The board also incooperates a power supply and is a Power over Ethernet (PoE) Powered Device (PD). Additonally, a Cyclone III FPGA from Altera is integrated on the board. The FPGA is mapped into the 32-bit AVR memory bus. The FPGA offers two DDR2 SDRAM interfaces, which will cover even the most exceptional need of memory bandwidth. Together with the onboard video decoder the board is ready for video processing. This patch does include the basic support for the fpga device driver, but not the device driver itself. Signed-off-by: Alex Raimondi <mailinglist@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-01-05Merge branch 'cleanups' into boardsHaavard Skinnemoen
2009-01-05avr32: Allow reserving multiple pins at onceAlex Raimondi
at32_reserve_pin now takes an u32 bitmask rather than a single pin. This allows to reserve multiple pins at once. Remove (undocumented) SDCS (pin PE26) from reservation in board setup code. Signed-off-by: Alex Raimondi <raimondi@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2009-01-05avr: struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers
(I did not compile or test it, please let me know, or help fixing it, if something is wrong with the conversion) This patch is part of a larger patch series which will remove the "char bus_id[20]" name string from struct device. The device name is managed in the kobject anyway, and without any size limitation, and just needlessly copied into "struct device". To set and read the device name dev_name(dev) and dev_set_name(dev) must be used. If your code uses static kobjects, which it shouldn't do, "const char *init_name" can be used to statically provide the name the registered device should have. At registration time, the init_name field is cleared, to enforce the use of dev_name(dev) to access the device name at a later time. We need to get rid of all occurrences of bus_id in the entire tree to be able to enable the new interface. Please apply this patch, and possibly convert any remaining remaining occurrences of bus_id. We want to submit a patch to -next, which will remove bus_id from "struct device", to find the remaining pieces to convert, and finally switch over to the new api, which will remove the 20 bytes array and does no longer have a size limitation. Thanks, Kay From: Kay Sievers <kay.sievers@vrfy.org> Subject: avr: struct device - replace bus_id with dev_name(), dev_set_name() Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-24avr32: Enable pullup on USART TX linesAnders Blomdell
Make USART initialization conform to Section 24.6.1 in the AT32AP7000 manual, i.e. "To prevent the TXD line from falling when the USART is disabled, the use of an internal pull up is mandatory." Signed-off-by: Anders Blomdell <anders.blomdell@control.lth.se> [haavard.skinnemoen@atmel.com: enable pullup on RX as well] Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-23Merge branches 'boards' and 'fixes' of ↵Haavard Skinnemoen
git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6
2008-10-23avr32: Fix GPIO initcall breakageHaavard Skinnemoen
Add essential system devices, including GPIO controllers, automatically at core_initcall time. This ensures that the devices are there when the PIO driver gets initialized at postcore_initcall, fixing a bug exposed by commit d6634db8fe1784d0a8e4e156970fec034708446e "avr32: Use platform_driver_probe for pio platform driver". Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-23avr32: Scale loops_per_jiffy when cpu frequency changesHaavard Skinnemoen
The loops_per_jiffy variable isn't updated when cpufreq changes the CPU frequency. This could cause udelay() and friends to produce wrong delays. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-23avr32: Fix bug in LCD pin setup on port CAlex Raimondi
Bug was introduced with the new at32_select_periph function. Signed-off-by: Alex Raimondi <mailinglist@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-20Merge branch 'genirq-v28-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip This merges branches irq/genirq, irq/sparseirq-v4, timers/hpet-percpu and x86/uv. The sparseirq branch is just preliminary groundwork: no sparse IRQs are actually implemented by this tree anymore - just the new APIs are added while keeping the old way intact as well (the new APIs map 1:1 to irq_desc[]). The 'real' sparse IRQ support will then be a relatively small patch ontop of this - with a v2.6.29 merge target. * 'genirq-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (178 commits) genirq: improve include files intr_remapping: fix typo io_apic: make irq_mis_count available on 64-bit too genirq: fix name space collisions of nr_irqs in arch/* genirq: fix name space collision of nr_irqs in autoprobe.c genirq: use iterators for irq_desc loops proc: fixup irq iterator genirq: add reverse iterator for irq_desc x86: move ack_bad_irq() to irq.c x86: unify show_interrupts() and proc helpers x86: cleanup show_interrupts genirq: cleanup the sparseirq modifications genirq: remove artifacts from sparseirq removal genirq: revert dynarray genirq: remove irq_to_desc_alloc genirq: remove sparse irq code genirq: use inline function for irq_to_desc genirq: consolidate nr_irqs and for_each_irq_desc() x86: remove sparse irq from Kconfig genirq: define nr_irqs for architectures with GENERIC_HARDIRQS=n ...
2008-10-16genirq: fix name space collisions of nr_irqs in arch/*Thomas Gleixner
local shadows of global variables are _bad_ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-10-15cpufreq: remove policy->governor setting in drivers initializationDominik Brodowski
As policy->governor is already set to CPUFREQ_DEFAULT_GOVERNOR in the (always built-in) cpufreq core, we do not need to set it in the drivers. This fixes the sparc64 allmodconfig build failure. Also, remove a totally useles setting of ->policy in cpufreq-pxa3xx.c. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13avr32: Fix MIMC200 board use of SPD network pinsMark Jackson
The MIMC200 board uses the SPD output pin from the Ethernet MACs for other purposes. One of these is as a board-reset, so I've had to #define off the SPD output pin declaration. This is probably not the best way of achieving this, but works in the current framework. Signed-off-by: Mark Jackson <mpfj@mimc.co.uk> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-12avr32: Allow selecting multiple pins at onceJulien May
at32_select_periph() now takes an u32 bitmask rather than a single pin. This allows to set multiple pins at once. Signed-off-by: Alex Raimondi <mailinglist@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-12Merge branch 'master' of ↵Haavard Skinnemoen
git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/atmel-mci-2.6.28
2008-10-05atmel-mci: Add experimental DMA supportHaavard Skinnemoen
This adds support for DMA transfers through the generic DMA engine framework with the DMA slave extensions. The driver has been tested using mmc-block and ext3fs on several SD, SDHC and MMC+ cards. Reads and writes work fine, with read transfer rates up to 7.5 MiB/s on fast cards with debugging disabled. Unfortunately, the driver has been known to lock up from time to time with DMA enabled, so DMA support is currently optional and marked EXPERIMENTAL. However, I didn't see any problems while testing 13 different cards (MMC, SD and SDHC of different brands and sizes), so I suspect the "Initialize BLKR before sending data transfer command" fix that was posted earlier fixed this as well. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-05atmel-mci: Platform code for supporting multiple mmc slotsHaavard Skinnemoen
Add the necessary platform infrastructure to support multiple mmc/sdcard slots all at once through a single controller. Currently, the driver will use the first valid slot it finds and stick with that, but later patches will add support for switching between several slots on the fly. Extend the platform data structure with per-slot information: MMC/SDcard bus width and card detect/write protect pins. This will affect the pin muxing as well as the capabilities announced to the mmc core. Note that board code is now required to supply a mci_platform_data struct to at32_add_device_mci(). Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-10-05avr32: Replace static clock list with dynamic linked listAlex Raimondi
This replaces the at32_clock_list array with a linked list. Clocks can now be registered (added) to the list. Signed-off-by: Alex Raimondi <raimondi@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-22avr32: Use platform_driver_probe for pdc platform driverUwe Kleine-König
The probe function of the pdc platform driver lives in the init section and so a pdc device that is created after the init section is discarded probably results in an oops. Even if this cannot happen, using platform_driver_probe is cleaner. (If this can happen and should be supported the probe function must live in the devinit section instead.) Signed-off-by: Uwe Kleine-König <ukleinek@strlen.de> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-22avr32: Use platform_driver_probe for pio platform driverUwe Kleine-König
The probe function of the pio platform driver lives in the init section and so a pio device that is created after the init section is discarded probably results in an oops. Even if this cannot happen, using platform_driver_probe is cleaner. (If this can happen and should be supported the probe function must live in the devinit section instead.) Signed-off-by: Uwe Kleine-König <ukleinek@strlen.de> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-22avr32: Provide a way to deselect pins in the portmuxHaavard Skinnemoen
Currently, setting up the portmux is completely one-shot: Once a pin is muxed, the portmux driver will complain loudly and refuse to do anything if you try to set up the same pin again. Sometimes, it may be necessary to change the configuration of a pin after it has been set up initially. This patch adds a way to undo the previous configuration, allowing the pin to be reconfigured. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-22avr32: Allow fine-grained control over LCDC pinsJulien May
This replaces the pin_config param with an u64 pin_mask in at32_add_device_lcdc, allowing a board-maintainer to indivually select specific lcdc pins. Signed-off-by: Alex Raimondi <raimondi@miromico.ch> Signed-off-by: Julien May <jmay@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-22avr32: use the new byteorder headersHarvey Harrison
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> [haavard.skinnemoen@atmel.com: fix <mach/io.h> build breakage] Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-09-01avr32: pm_standby low-power ram bug fixHumphrey Bucknell
The value stored into the SDRAMC LPR register should be the current value of the register with the Self-refresh value set in the lower bit field. The bug involved only the Self-refresh value being written to the register, thus over writing any low-power ram settings. Signed-off-by: Humphrey Bucknell <hbucknell@saitek.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-08-08avr32: Clean up HMATRIX codeHaavard Skinnemoen
Introduce a few helper functions for HMATRIX configuration and clean up the register definitions. Also add definitions for the HMATRIX master and slave IDs on the AT32AP700x chips. Also make the definitions in hmatrix.h available to board code by moving it to <mach/hmatrix.h> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-08-08avr32: Add MMIO address definitions for certain controllersHaavard Skinnemoen
Hardcoded MMIO base addresses are used a few places throughout the platform code. Move these into the chip-specific header file so that adding support for new chips becomes a bit easier. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-08-08avr32: Introduce <mach/chip.h>Haavard Skinnemoen
This file includes the appropriate chip-specific header with MMIO, IRQ and GPIO definitions used by the platform code. It may also be used to provide inline GPIO accessors for drivers that are willing to sacrifice portability for faster bitbanging. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-08-05avr32: Use <mach/foo.h> instead of <asm/arch/foo.h>Haavard Skinnemoen
Update all avr32-specific files to use the new platform-specific header locations. Drivers shared with ARM are left alone for now. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-08-05avr32: Introduce arch/avr32/mach-*/include/machHaavard Skinnemoen
Add arch/avr32/mach-*/include to include search path and copy all the files from include/asm/arch there. The old files will be removed once ARM does the same change and all common drivers are converted. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-07-27avr32: some mmc/sd cleanupsDavid Brownell
Minor cleanups for the MMC/SD support on avr32: - Make at32_add_device_mci() properly initialize "missing" platform data ... so boards like STK1002 won't try GPIO 0. - Switch over to gpio_is_valid() instead of testing for only one designated value. - Provide STK1002 platform data for the unlikely case that switches are set so first Ethernet controller isn't in use. (That's the only way to get card detect and writeprotect switch sensing on the STK1000.) And get rid of one "unused variable" warning. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-07-27Merge commit 'upstream/master'Haavard Skinnemoen
2008-07-26Merge git://git.infradead.org/mtd-2.6Linus Torvalds
* git://git.infradead.org/mtd-2.6: (57 commits) [MTD] [NAND] subpage read feature as a way to increase performance. CPUFREQ: S3C24XX NAND driver frequency scaling support. [MTD][NAND] au1550nd: remove unused variable [MTD] jedec_probe: Fix SST 16-bit chip detection [MTD][MTDPART] Fix a division by zero bug [MTD][MTDPART] Cleanup and document the erase region handling [MTD][MTDPART] Handle most checkpatch findings [MTD][MTDPART] Seperate main loop from per-partition code in add_mtd_partition [MTD] physmap: resume already suspended chips on failure to suspend [MTD] physmap: Fix suspend/resume/shutdown bugs. [MTD] [NOR] Fix -ETIMEO errors in CFI driver [MTD] [NAND] fsl_elbc_nand: fix section mismatch with CONFIG_MTD_OF_PARTS=y [JFFS2] Use .unlocked_ioctl [MTD] Fix const assignment in the MTD command line partitioning driver [MTD] [NOR] gen_probe: No debug message when debugging is disabled [MTD] [NAND] remove __PPC__ hardcoded address from DiskOnChip drivers [MTD] [MAPS] Remove the bast-flash driver. [MTD] [NAND] fsl_elbc_nand: ecclayout cleanups [MTD] [NAND] fsl_elbc_nand: implement support for flash-based BBT [MTD] [NAND] fsl_elbc_nand: fix OOB workability for large page NAND chips ...
2008-07-25gpio: sysfs interfaceDavid Brownell
This adds a simple sysfs interface for GPIOs. /sys/class/gpio /export ... asks the kernel to export a GPIO to userspace /unexport ... to return a GPIO to the kernel /gpioN ... for each exported GPIO #N /value ... always readable, writes fail for input GPIOs /direction ... r/w as: in, out (default low); write high, low /gpiochipN ... for each gpiochip; #N is its first GPIO /base ... (r/o) same as N /label ... (r/o) descriptive, not necessarily unique /ngpio ... (r/o) number of GPIOs; numbered N .. N+(ngpio - 1) GPIOs claimed by kernel code may be exported by its owner using a new gpio_export() call, which should be most useful for driver debugging. Such exports may optionally be done without a "direction" attribute. Userspace may ask to take over a GPIO by writing to a sysfs control file, helping to cope with incomplete board support or other "one-off" requirements that don't merit full kernel support: echo 23 > /sys/class/gpio/export ... will gpio_request(23, "sysfs") and gpio_export(23); use /sys/class/gpio/gpio-23/direction to (re)configure it, when that GPIO can be used as both input and output. echo 23 > /sys/class/gpio/unexport ... will gpio_free(23), when it was exported as above The extra D-space footprint is a few hundred bytes, except for the sysfs resources associated with each exported GPIO. The additional I-space footprint is about two thirds of the current size of gpiolib (!). Since no /dev node creation is involved, no "udev" support is needed. Related changes: * This adds a device pointer to "struct gpio_chip". When GPIO providers initialize that, sysfs gpio class devices become children of that device instead of being "virtual" devices. * The (few) gpio_chip providers which have such a device node have been updated. * Some gpio_chip drivers also needed to update their module "owner" field ... for which missing kerneldoc was added. * Some gpio_chips don't support input GPIOs. Those GPIOs are now flagged appropriately when the chip is registered. Based on previous patches, and discussion both on and off LKML. A Documentation/ABI/testing/sysfs-gpio update is ready to submit once this merges to mainline. [akpm@linux-foundation.org: a few maintenance build fixes] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Cc: Greg KH <greg@kroah.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25Merge branch 'linux-next' of git://git.infradead.org/~dedekind/ubi-2.6David Woodhouse