drivers/misc/cb710/core.c - kernel/prism - Git at Google

 /*
  *  cb710/core.c
  *
  *  Copyright by Michał Mirosław, 2008-2009
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/spinlock.h>
 #include <linux/idr.h>
 #include <linux/cb710.h>

 static DEFINE_IDA(cb710_ida);
 static DEFINE_SPINLOCK(cb710_ida_lock);

 void cb710_pci_update_config_reg(struct pci_dev *pdev,
 	int reg, uint32_t mask, uint32_t xor)
 {
 	u32 rval;

 	pci_read_config_dword(pdev, reg, &rval);
 	rval = (rval & mask) ^ xor;
 	pci_write_config_dword(pdev, reg, rval);
 }
 EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);

 /* Some magic writes based on Windows driver init code */
 static int __devinit cb710_pci_configure(struct pci_dev *pdev)
 {
 	unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
 	struct pci_dev *pdev0 = pci_get_slot(pdev->bus, devfn);
 	u32 val;

 	cb710_pci_update_config_reg(pdev, 0x48,
 		~0x000000FF, 0x0000003F);

 	pci_read_config_dword(pdev, 0x48, &val);
 	if (val & 0x80000000)
 		return 0;

 	if (!pdev0)
 		return -ENODEV;

 	if (pdev0->vendor == PCI_VENDOR_ID_ENE
 	    && pdev0->device == PCI_DEVICE_ID_ENE_720) {
 		cb710_pci_update_config_reg(pdev0, 0x8C,
 			~0x00F00000, 0x00100000);
 		cb710_pci_update_config_reg(pdev0, 0xB0,
 			~0x08000000, 0x08000000);
 	}

 	cb710_pci_update_config_reg(pdev0, 0x8C,
 		~0x00000F00, 0x00000200);
 	cb710_pci_update_config_reg(pdev0, 0x90,
 		~0x00060000, 0x00040000);

 	pci_dev_put(pdev0);

 	return 0;
 }

 static irqreturn_t cb710_irq_handler(int irq, void *data)
 {
 	struct cb710_chip *chip = data;
 	struct cb710_slot *slot = &chip->slot[0];
 	irqreturn_t handled = IRQ_NONE;
 	unsigned nr;

 	spin_lock(&chip->irq_lock); /* incl. smp_rmb() */

 	for (nr = chip->slots; nr; ++slot, --nr) {
 		cb710_irq_handler_t handler_func = slot->irq_handler;
 		if (handler_func && handler_func(slot))
 			handled = IRQ_HANDLED;
 	}

 	spin_unlock(&chip->irq_lock);

 	return handled;
 }

 static void cb710_release_slot(struct device *dev)
 {
 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
 	struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
 	struct cb710_chip *chip = cb710_slot_to_chip(slot);

 	/* slot struct can be freed now */
 	atomic_dec(&chip->slot_refs_count);
 #endif
 }

 static int __devinit cb710_register_slot(struct cb710_chip *chip,
 	unsigned slot_mask, unsigned io_offset, const char *name)
 {
 	int nr = chip->slots;
 	struct cb710_slot *slot = &chip->slot[nr];
 	int err;

 	dev_dbg(cb710_chip_dev(chip),
 		"register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
 		name, chip->platform_id, nr, slot_mask, io_offset);

 	/* slot->irq_handler == NULL here; this needs to be
 	 * seen before platform_device_register() */
 	++chip->slots;
 	smp_wmb();

 	slot->iobase = chip->iobase + io_offset;
 	slot->pdev.name = name;
 	slot->pdev.id = chip->platform_id;
 	slot->pdev.dev.parent = &chip->pdev->dev;
 	slot->pdev.dev.release = cb710_release_slot;

 	err = platform_device_register(&slot->pdev);

 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
 	atomic_inc(&chip->slot_refs_count);
 #endif

 	if (err) {
 		/* device_initialize() called from platform_device_register()
 		 * wants this on error path */
 		platform_device_put(&slot->pdev);

 		/* slot->irq_handler == NULL here anyway, so no lock needed */
 		--chip->slots;
 		return err;
 	}

 	chip->slot_mask |= slot_mask;

 	return 0;
 }

 static void cb710_unregister_slot(struct cb710_chip *chip,
 	unsigned slot_mask)
 {
 	int nr = chip->slots - 1;

 	if (!(chip->slot_mask & slot_mask))
 		return;

 	platform_device_unregister(&chip->slot[nr].pdev);

 	/* complementary to spin_unlock() in cb710_set_irq_handler() */
 	smp_rmb();
 	BUG_ON(chip->slot[nr].irq_handler != NULL);

 	/* slot->irq_handler == NULL here, so no lock needed */
 	--chip->slots;
 	chip->slot_mask &= ~slot_mask;
 }

 void cb710_set_irq_handler(struct cb710_slot *slot,
 	cb710_irq_handler_t handler)
 {
 	struct cb710_chip *chip = cb710_slot_to_chip(slot);
 	unsigned long flags;

 	spin_lock_irqsave(&chip->irq_lock, flags);
 	slot->irq_handler = handler;
 	spin_unlock_irqrestore(&chip->irq_lock, flags);
 }
 EXPORT_SYMBOL_GPL(cb710_set_irq_handler);

 #ifdef CONFIG_PM

 static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct cb710_chip *chip = pci_get_drvdata(pdev);

 	free_irq(pdev->irq, chip);
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 	if (state.event & PM_EVENT_SLEEP)
 		pci_set_power_state(pdev, PCI_D3cold);
 	return 0;
 }

 static int cb710_resume(struct pci_dev *pdev)
 {
 	struct cb710_chip *chip = pci_get_drvdata(pdev);
 	int err;

 	pci_set_power_state(pdev, PCI_D0);
 	pci_restore_state(pdev);
 	err = pcim_enable_device(pdev);
 	if (err)
 		return err;

 	return devm_request_irq(&pdev->dev, pdev->irq,
 		cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
 }

 #endif /* CONFIG_PM */

 static int __devinit cb710_probe(struct pci_dev *pdev,
 	const struct pci_device_id *ent)
 {
 	struct cb710_chip *chip;
 	unsigned long flags;
 	u32 val;
 	int err;
 	int n = 0;

 	err = cb710_pci_configure(pdev);
 	if (err)
 		return err;

 	/* this is actually magic... */
 	pci_read_config_dword(pdev, 0x48, &val);
 	if (!(val & 0x80000000)) {
 		pci_write_config_dword(pdev, 0x48, val|0x71000000);
 		pci_read_config_dword(pdev, 0x48, &val);
 	}

 	dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
 	if (!(val & 0x70000000))
 		return -ENODEV;
 	val = (val >> 28) & 7;
 	if (val & CB710_SLOT_MMC)
 		++n;
 	if (val & CB710_SLOT_MS)
 		++n;
 	if (val & CB710_SLOT_SM)
 		++n;

 	chip = devm_kzalloc(&pdev->dev,
 		sizeof(*chip) + n * sizeof(*chip->slot), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	err = pcim_enable_device(pdev);
 	if (err)
 		return err;

 	err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
 	if (err)
 		return err;

 	chip->pdev = pdev;
 	chip->iobase = pcim_iomap_table(pdev)[0];

 	pci_set_drvdata(pdev, chip);

 	err = devm_request_irq(&pdev->dev, pdev->irq,
 		cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (err)
 		return err;

 	do {
 		if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
 			return -ENOMEM;

 		spin_lock_irqsave(&cb710_ida_lock, flags);
 		err = ida_get_new(&cb710_ida, &chip->platform_id);
 		spin_unlock_irqrestore(&cb710_ida_lock, flags);

 		if (err && err != -EAGAIN)
 			return err;
 	} while (err);


 	dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
 		chip->platform_id, chip->iobase, pdev->irq);

 	if (val & CB710_SLOT_MMC) {	/* MMC/SD slot */
 		err = cb710_register_slot(chip,
 			CB710_SLOT_MMC, 0x00, "cb710-mmc");
 		if (err)
 			return err;
 	}

 	if (val & CB710_SLOT_MS) {	/* MemoryStick slot */
 		err = cb710_register_slot(chip,
 			CB710_SLOT_MS, 0x40, "cb710-ms");
 		if (err)
 			goto unreg_mmc;
 	}

 	if (val & CB710_SLOT_SM) {	/* SmartMedia slot */
 		err = cb710_register_slot(chip,
 			CB710_SLOT_SM, 0x60, "cb710-sm");
 		if (err)
 			goto unreg_ms;
 	}

 	return 0;
 unreg_ms:
 	cb710_unregister_slot(chip, CB710_SLOT_MS);
 unreg_mmc:
 	cb710_unregister_slot(chip, CB710_SLOT_MMC);

 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
 	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
 #endif
 	return err;
 }

 static void __devexit cb710_remove_one(struct pci_dev *pdev)
 {
 	struct cb710_chip *chip = pci_get_drvdata(pdev);
 	unsigned long flags;

 	cb710_unregister_slot(chip, CB710_SLOT_SM);
 	cb710_unregister_slot(chip, CB710_SLOT_MS);
 	cb710_unregister_slot(chip, CB710_SLOT_MMC);
 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
 	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
 #endif

 	spin_lock_irqsave(&cb710_ida_lock, flags);
 	ida_remove(&cb710_ida, chip->platform_id);
 	spin_unlock_irqrestore(&cb710_ida_lock, flags);
 }

 static const struct pci_device_id cb710_pci_tbl[] = {
 	{ PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
 		PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0, }
 };

 static struct pci_driver cb710_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = cb710_pci_tbl,
 	.probe = cb710_probe,
 	.remove = __devexit_p(cb710_remove_one),
 #ifdef CONFIG_PM
 	.suspend = cb710_suspend,
 	.resume = cb710_resume,
 #endif
 };

 static int __init cb710_init_module(void)
 {
 	return pci_register_driver(&cb710_driver);
 }

 static void __exit cb710_cleanup_module(void)
 {
 	pci_unregister_driver(&cb710_driver);
 	ida_destroy(&cb710_ida);
 }

 module_init(cb710_init_module);
 module_exit(cb710_cleanup_module);

 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
 MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
	/*
	* cb710/core.c
	*
	* Copyright by Michał Mirosław, 2008-2009
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/pci.h>
	#include <linux/spinlock.h>
	#include <linux/idr.h>
	#include <linux/cb710.h>

	static DEFINE_IDA(cb710_ida);
	static DEFINE_SPINLOCK(cb710_ida_lock);

	void cb710_pci_update_config_reg(struct pci_dev *pdev,
	int reg, uint32_t mask, uint32_t xor)
	{
	u32 rval;

	pci_read_config_dword(pdev, reg, &rval);
	rval = (rval & mask) ^ xor;
	pci_write_config_dword(pdev, reg, rval);
	}
	EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);

	/* Some magic writes based on Windows driver init code */
	static int __devinit cb710_pci_configure(struct pci_dev *pdev)
	{
	unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
	struct pci_dev *pdev0 = pci_get_slot(pdev->bus, devfn);
	u32 val;

	cb710_pci_update_config_reg(pdev, 0x48,
	~0x000000FF, 0x0000003F);

	pci_read_config_dword(pdev, 0x48, &val);
	if (val & 0x80000000)
	return 0;

	if (!pdev0)
	return -ENODEV;

	if (pdev0->vendor == PCI_VENDOR_ID_ENE
	&& pdev0->device == PCI_DEVICE_ID_ENE_720) {
	cb710_pci_update_config_reg(pdev0, 0x8C,
	~0x00F00000, 0x00100000);
	cb710_pci_update_config_reg(pdev0, 0xB0,
	~0x08000000, 0x08000000);
	}

	cb710_pci_update_config_reg(pdev0, 0x8C,
	~0x00000F00, 0x00000200);
	cb710_pci_update_config_reg(pdev0, 0x90,
	~0x00060000, 0x00040000);

	pci_dev_put(pdev0);

	return 0;
	}

	static irqreturn_t cb710_irq_handler(int irq, void *data)
	{
	struct cb710_chip *chip = data;
	struct cb710_slot *slot = &chip->slot[0];
	irqreturn_t handled = IRQ_NONE;
	unsigned nr;

	spin_lock(&chip->irq_lock); /* incl. smp_rmb() */

	for (nr = chip->slots; nr; ++slot, --nr) {
	cb710_irq_handler_t handler_func = slot->irq_handler;
	if (handler_func && handler_func(slot))
	handled = IRQ_HANDLED;
	}

	spin_unlock(&chip->irq_lock);

	return handled;
	}

	static void cb710_release_slot(struct device *dev)
	{
	#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
	struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
	struct cb710_chip *chip = cb710_slot_to_chip(slot);

	/* slot struct can be freed now */
	atomic_dec(&chip->slot_refs_count);
	#endif
	}

	static int __devinit cb710_register_slot(struct cb710_chip *chip,
	unsigned slot_mask, unsigned io_offset, const char *name)
	{
	int nr = chip->slots;
	struct cb710_slot *slot = &chip->slot[nr];
	int err;

	dev_dbg(cb710_chip_dev(chip),
	"register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
	name, chip->platform_id, nr, slot_mask, io_offset);

	/* slot->irq_handler == NULL here; this needs to be
	* seen before platform_device_register() */
	++chip->slots;
	smp_wmb();

	slot->iobase = chip->iobase + io_offset;
	slot->pdev.name = name;
	slot->pdev.id = chip->platform_id;
	slot->pdev.dev.parent = &chip->pdev->dev;
	slot->pdev.dev.release = cb710_release_slot;

	err = platform_device_register(&slot->pdev);

	#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
	atomic_inc(&chip->slot_refs_count);
	#endif

	if (err) {
	/* device_initialize() called from platform_device_register()
	* wants this on error path */
	platform_device_put(&slot->pdev);

	/* slot->irq_handler == NULL here anyway, so no lock needed */
	--chip->slots;
	return err;
	}

	chip->slot_mask \|= slot_mask;

	return 0;
	}

	static void cb710_unregister_slot(struct cb710_chip *chip,
	unsigned slot_mask)
	{
	int nr = chip->slots - 1;

	if (!(chip->slot_mask & slot_mask))
	return;

	platform_device_unregister(&chip->slot[nr].pdev);

	/* complementary to spin_unlock() in cb710_set_irq_handler() */
	smp_rmb();
	BUG_ON(chip->slot[nr].irq_handler != NULL);

	/* slot->irq_handler == NULL here, so no lock needed */
	--chip->slots;
	chip->slot_mask &= ~slot_mask;
	}

	void cb710_set_irq_handler(struct cb710_slot *slot,
	cb710_irq_handler_t handler)
	{
	struct cb710_chip *chip = cb710_slot_to_chip(slot);
	unsigned long flags;

	spin_lock_irqsave(&chip->irq_lock, flags);
	slot->irq_handler = handler;
	spin_unlock_irqrestore(&chip->irq_lock, flags);
	}
	EXPORT_SYMBOL_GPL(cb710_set_irq_handler);

	#ifdef CONFIG_PM

	static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
	{
	struct cb710_chip *chip = pci_get_drvdata(pdev);

	free_irq(pdev->irq, chip);
	pci_save_state(pdev);
	pci_disable_device(pdev);
	if (state.event & PM_EVENT_SLEEP)
	pci_set_power_state(pdev, PCI_D3cold);
	return 0;
	}

	static int cb710_resume(struct pci_dev *pdev)
	{
	struct cb710_chip *chip = pci_get_drvdata(pdev);
	int err;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	err = pcim_enable_device(pdev);
	if (err)
	return err;

	return devm_request_irq(&pdev->dev, pdev->irq,
	cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
	}

	#endif /* CONFIG_PM */

	static int __devinit cb710_probe(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	struct cb710_chip *chip;
	unsigned long flags;
	u32 val;
	int err;
	int n = 0;

	err = cb710_pci_configure(pdev);
	if (err)
	return err;

	/* this is actually magic... */
	pci_read_config_dword(pdev, 0x48, &val);
	if (!(val & 0x80000000)) {
	pci_write_config_dword(pdev, 0x48, val\|0x71000000);
	pci_read_config_dword(pdev, 0x48, &val);
	}

	dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
	if (!(val & 0x70000000))
	return -ENODEV;
	val = (val >> 28) & 7;
	if (val & CB710_SLOT_MMC)
	++n;
	if (val & CB710_SLOT_MS)
	++n;
	if (val & CB710_SLOT_SM)
	++n;

	chip = devm_kzalloc(&pdev->dev,
	sizeof(chip) + n sizeof(*chip->slot), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	err = pcim_enable_device(pdev);
	if (err)
	return err;

	err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
	if (err)
	return err;

	chip->pdev = pdev;
	chip->iobase = pcim_iomap_table(pdev)[0];

	pci_set_drvdata(pdev, chip);

	err = devm_request_irq(&pdev->dev, pdev->irq,
	cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
	if (err)
	return err;

	do {
	if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
	return -ENOMEM;

	spin_lock_irqsave(&cb710_ida_lock, flags);
	err = ida_get_new(&cb710_ida, &chip->platform_id);
	spin_unlock_irqrestore(&cb710_ida_lock, flags);

	if (err && err != -EAGAIN)
	return err;
	} while (err);


	dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
	chip->platform_id, chip->iobase, pdev->irq);

	if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
	err = cb710_register_slot(chip,
	CB710_SLOT_MMC, 0x00, "cb710-mmc");
	if (err)
	return err;
	}

	if (val & CB710_SLOT_MS) { /* MemoryStick slot */
	err = cb710_register_slot(chip,
	CB710_SLOT_MS, 0x40, "cb710-ms");
	if (err)
	goto unreg_mmc;
	}

	if (val & CB710_SLOT_SM) { /* SmartMedia slot */
	err = cb710_register_slot(chip,
	CB710_SLOT_SM, 0x60, "cb710-sm");
	if (err)
	goto unreg_ms;
	}

	return 0;
	unreg_ms:
	cb710_unregister_slot(chip, CB710_SLOT_MS);
	unreg_mmc:
	cb710_unregister_slot(chip, CB710_SLOT_MMC);

	#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
	#endif
	return err;
	}

	static void __devexit cb710_remove_one(struct pci_dev *pdev)
	{
	struct cb710_chip *chip = pci_get_drvdata(pdev);
	unsigned long flags;

	cb710_unregister_slot(chip, CB710_SLOT_SM);
	cb710_unregister_slot(chip, CB710_SLOT_MS);
	cb710_unregister_slot(chip, CB710_SLOT_MMC);
	#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
	#endif

	spin_lock_irqsave(&cb710_ida_lock, flags);
	ida_remove(&cb710_ida, chip->platform_id);
	spin_unlock_irqrestore(&cb710_ida_lock, flags);
	}

	static const struct pci_device_id cb710_pci_tbl[] = {
	{ PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
	PCI_ANY_ID, PCI_ANY_ID, },
	{ 0, }
	};

	static struct pci_driver cb710_driver = {
	.name = KBUILD_MODNAME,
	.id_table = cb710_pci_tbl,
	.probe = cb710_probe,
	.remove = __devexit_p(cb710_remove_one),
	#ifdef CONFIG_PM
	.suspend = cb710_suspend,
	.resume = cb710_resume,
	#endif
	};

	static int __init cb710_init_module(void)
	{
	return pci_register_driver(&cb710_driver);
	}

	static void __exit cb710_cleanup_module(void)
	{
	pci_unregister_driver(&cb710_driver);
	ida_destroy(&cb710_ida);
	}

	module_init(cb710_init_module);
	module_exit(cb710_cleanup_module);

	MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
	MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);