[mirror_ubuntu-hirsute-kernel.git] / drivers / uio / uio_aec.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
 *
 * Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/uio_driver.h>
#include <linux/slab.h>

#define PCI_VENDOR_ID_AEC 0xaecb
#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250

#define INT_ENABLE_ADDR		0xFC
#define INT_ENABLE		0x10
#define INT_DISABLE		0x0

#define INT_MASK_ADDR		0x2E
#define INT_MASK_ALL		0x3F

#define INTA_DRVR_ADDR		0xFE
#define INTA_ENABLED_FLAG	0x08
#define INTA_FLAG		0x01

#define MAILBOX			0x0F

static struct pci_device_id ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ids);

static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
{
	void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
	unsigned char status = ioread8(int_flag);


	if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
		/* application writes 0x00 to 0x2F to get next interrupt */
		status = ioread8(dev_info->priv + MAILBOX);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
{
	dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
		" revision: %c%c\n",
		ioread8(i->priv + 0x01),
		ioread8(i->priv + 0x00),
		ioread8(i->priv + 0x03),
		ioread8(i->priv + 0x02),
		ioread8(i->priv + 0x06),
		ioread8(i->priv + 0x07));
}

static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct uio_info *info;
	int ret;

	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (pci_enable_device(pdev))
		goto out_free;

	if (pci_request_regions(pdev, "aectc"))
		goto out_disable;

	info->name = "aectc";
	info->port[0].start = pci_resource_start(pdev, 0);
	if (!info->port[0].start)
		goto out_release;
	info->priv = pci_iomap(pdev, 0, 0);
	if (!info->priv)
		goto out_release;
	info->port[0].size = pci_resource_len(pdev, 0);
	info->port[0].porttype = UIO_PORT_GPIO;

	info->version = "0.0.1";
	info->irq = pdev->irq;
	info->irq_flags = IRQF_SHARED;
	info->handler = aectc_irq;

	print_board_data(pdev, info);
	ret = uio_register_device(&pdev->dev, info);
	if (ret)
		goto out_unmap;

	iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
	iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
	if (!(ioread8(info->priv + INTA_DRVR_ADDR)
			& INTA_ENABLED_FLAG))
		dev_err(&pdev->dev, "aectc: interrupts not enabled\n");

	pci_set_drvdata(pdev, info);

	return 0;

out_unmap:
	pci_iounmap(pdev, info->priv);
out_release:
	pci_release_regions(pdev);
out_disable:
	pci_disable_device(pdev);
out_free:
	kfree(info);
	return -ENODEV;
}

static void remove(struct pci_dev *pdev)
{
	struct uio_info *info = pci_get_drvdata(pdev);

	/* disable interrupts */
	iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
	iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
	/* read mailbox to ensure board drops irq */
	ioread8(info->priv + MAILBOX);

	uio_unregister_device(info);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	iounmap(info->priv);

	kfree(info);
}

static struct pci_driver pci_driver = {
	.name = "aectc",
	.id_table = ids,
	.probe = probe,
	.remove = remove,
};

module_pci_driver(pci_driver);
MODULE_LICENSE("GPL");
Commit	Line	Data
45051539	1	// SPDX-License-Identifier: GPL-2.0-only
1bafeb37 BP	2	/*
	3	* uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
	4	*
	5	* Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
1bafeb37 BP	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/pci.h>
	11	#include <linux/init.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/cdev.h>
	14	#include <linux/fs.h>
	15	#include <linux/io.h>
	16	#include <linux/uaccess.h>
	17	#include <linux/uio_driver.h>
5a0e3ad6	18	#include <linux/slab.h>
1bafeb37 BP	19
	20	#define PCI_VENDOR_ID_AEC 0xaecb
	21	#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
	22
	23	#define INT_ENABLE_ADDR 0xFC
	24	#define INT_ENABLE 0x10
	25	#define INT_DISABLE 0x0
	26
	27	#define INT_MASK_ADDR 0x2E
	28	#define INT_MASK_ALL 0x3F
	29
	30	#define INTA_DRVR_ADDR 0xFE
	31	#define INTA_ENABLED_FLAG 0x08
	32	#define INTA_FLAG 0x01
	33
	34	#define MAILBOX 0x0F
	35
	36	static struct pci_device_id ids[] = {
	37	{ PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
	38	{ 0, }
	39	};
	40	MODULE_DEVICE_TABLE(pci, ids);
	41
	42	static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
	43	{
	44	void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
	45	unsigned char status = ioread8(int_flag);
	46
	47
	48	if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
	49	/* application writes 0x00 to 0x2F to get next interrupt */
	50	status = ioread8(dev_info->priv + MAILBOX);
	51	return IRQ_HANDLED;
	52	}
	53
	54	return IRQ_NONE;
	55	}
	56
	57	static void print_board_data(struct pci_dev pdev, struct uio_info i)
	58	{
	59	dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
	60	" revision: %c%c\n",
	61	ioread8(i->priv + 0x01),
	62	ioread8(i->priv + 0x00),
	63	ioread8(i->priv + 0x03),
	64	ioread8(i->priv + 0x02),
	65	ioread8(i->priv + 0x06),
	66	ioread8(i->priv + 0x07));
	67	}
	68
b17b75bb	69	static int probe(struct pci_dev pdev, const struct pci_device_id id)
1bafeb37 BP	70	{
	71	struct uio_info *info;
	72	int ret;
	73
	74	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
	75	if (!info)
	76	return -ENOMEM;
	77
	78	if (pci_enable_device(pdev))
	79	goto out_free;
	80
	81	if (pci_request_regions(pdev, "aectc"))
	82	goto out_disable;
	83
	84	info->name = "aectc";
	85	info->port[0].start = pci_resource_start(pdev, 0);
	86	if (!info->port[0].start)
	87	goto out_release;
	88	info->priv = pci_iomap(pdev, 0, 0);
	89	if (!info->priv)
	90	goto out_release;
	91	info->port[0].size = pci_resource_len(pdev, 0);
	92	info->port[0].porttype = UIO_PORT_GPIO;
	93
	94	info->version = "0.0.1";
	95	info->irq = pdev->irq;
	96	info->irq_flags = IRQF_SHARED;
	97	info->handler = aectc_irq;
	98
	99	print_board_data(pdev, info);
	100	ret = uio_register_device(&pdev->dev, info);
	101	if (ret)
	102	goto out_unmap;
	103
	104	iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
	105	iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
	106	if (!(ioread8(info->priv + INTA_DRVR_ADDR)
	107	& INTA_ENABLED_FLAG))
	108	dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
	109
	110	pci_set_drvdata(pdev, info);
	111
	112	return 0;
	113
	114	out_unmap:
	115	pci_iounmap(pdev, info->priv);
	116	out_release:
	117	pci_release_regions(pdev);
	118	out_disable:
	119	pci_disable_device(pdev);
	120	out_free:
	121	kfree(info);
	122	return -ENODEV;
	123	}
	124
	125	static void remove(struct pci_dev *pdev)
	126	{
	127	struct uio_info *info = pci_get_drvdata(pdev);
	128
	129	/* disable interrupts */
	130	iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
	131	iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
	132	/* read mailbox to ensure board drops irq */
	133	ioread8(info->priv + MAILBOX);
134
135	uio_unregister_device(info);
136	pci_release_regions(pdev);
137	pci_disable_device(pdev);
1bafeb37 BP	138	iounmap(info->priv);
	139
	140	kfree(info);
	141	}
	142
	143	static struct pci_driver pci_driver = {
	144	.name = "aectc",
	145	.id_table = ids,
	146	.probe = probe,
	147	.remove = remove,
	148	};
	149
aa8c06f7	150	module_pci_driver(pci_driver);
1bafeb37	151	MODULE_LICENSE("GPL");