1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * comedi/drivers/amplc_pci236.c
4 * Driver for Amplicon PCI236 DIO boards.
5 *
6 * Copyright (C) 2002-2014 MEV Ltd. <https://www.mev.co.uk/>
7 *
8 * COMEDI - Linux Control and Measurement Device Interface
9 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
10 */
11/*
12 * Driver: amplc_pci236
13 * Description: Amplicon PCI236
14 * Author: Ian Abbott <abbotti@mev.co.uk>
15 * Devices: [Amplicon] PCI236 (amplc_pci236)
16 * Updated: Fri, 25 Jul 2014 15:32:40 +0000
17 * Status: works
18 *
19 * Configuration options:
20 *   none
21 *
22 * Manual configuration of PCI board (PCI236) is not supported; it is
23 * configured automatically.
24 *
25 * The PCI236 board has a single 8255 appearing as subdevice 0.
26 *
27 * Subdevice 1 pretends to be a digital input device, but it always
28 * returns 0 when read. However, if you run a command with
29 * scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
30 * external trigger, which can be used to wake up tasks.  This is like
31 * the comedi_parport device.  If no interrupt is connected, then
32 * subdevice 1 is unused.
33 */
34
35#include <linux/module.h>
36#include <linux/interrupt.h>
37#include <linux/comedi/comedi_pci.h>
38
39#include "amplc_pc236.h"
40#include "plx9052.h"
41
42/* Disable, and clear, interrupts */
43#define PCI236_INTR_DISABLE	(PLX9052_INTCSR_LI1POL |	\
44				 PLX9052_INTCSR_LI2POL |	\
45				 PLX9052_INTCSR_LI1SEL |	\
46				 PLX9052_INTCSR_LI1CLRINT)
47
48/* Enable, and clear, interrupts */
49#define PCI236_INTR_ENABLE	(PLX9052_INTCSR_LI1ENAB |	\
50				 PLX9052_INTCSR_LI1POL |	\
51				 PLX9052_INTCSR_LI2POL |	\
52				 PLX9052_INTCSR_PCIENAB |	\
53				 PLX9052_INTCSR_LI1SEL |	\
54				 PLX9052_INTCSR_LI1CLRINT)
55
56static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
57{
58	struct pc236_private *devpriv = dev->private;
59
60	/* this will also clear the "local interrupt 1" latch */
61	outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
62	     devpriv->lcr_iobase + PLX9052_INTCSR);
63}
64
65static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
66{
67	struct pc236_private *devpriv = dev->private;
68
69	/* check if interrupt occurred */
70	if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
71	      PLX9052_INTCSR_LI1STAT))
72		return false;
73	/* clear the interrupt */
74	pci236_intr_update_cb(dev, devpriv->enable_irq);
75	return true;
76}
77
78static const struct pc236_board pc236_pci_board = {
79	.name = "pci236",
80	.intr_update_cb = pci236_intr_update_cb,
81	.intr_chk_clr_cb = pci236_intr_chk_clr_cb,
82};
83
84static int pci236_auto_attach(struct comedi_device *dev,
85			      unsigned long context_unused)
86{
87	struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
88	struct pc236_private *devpriv;
89	unsigned long iobase;
90	int ret;
91
92	dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
93		 pci_name(pci_dev));
94
95	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
96	if (!devpriv)
97		return -ENOMEM;
98
99	dev->board_ptr = &pc236_pci_board;
100	dev->board_name = pc236_pci_board.name;
101	ret = comedi_pci_enable(dev);
102	if (ret)
103		return ret;
104
105	devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
106	iobase = pci_resource_start(pci_dev, 2);
107	return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
108					 IRQF_SHARED);
109}
110
111static struct comedi_driver amplc_pci236_driver = {
112	.driver_name = "amplc_pci236",
113	.module = THIS_MODULE,
114	.auto_attach = pci236_auto_attach,
115	.detach = comedi_pci_detach,
116};
117
118static const struct pci_device_id pci236_pci_table[] = {
119	{ PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
120	{ 0 }
121};
122
123MODULE_DEVICE_TABLE(pci, pci236_pci_table);
124
125static int amplc_pci236_pci_probe(struct pci_dev *dev,
126				  const struct pci_device_id *id)
127{
128	return comedi_pci_auto_config(dev, &amplc_pci236_driver,
129				      id->driver_data);
130}
131
132static struct pci_driver amplc_pci236_pci_driver = {
133	.name		= "amplc_pci236",
134	.id_table	= pci236_pci_table,
135	.probe		= &amplc_pci236_pci_probe,
136	.remove		= comedi_pci_auto_unconfig,
137};
138
139module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
140
141MODULE_AUTHOR("Comedi https://www.comedi.org");
142MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
143MODULE_LICENSE("GPL");
144