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
38 #include "../comedi_pci.h"
39
40 #include "amplc_pc236.h"
41 #include "plx9052.h"
42
43 /* Disable, and clear, interrupts */
44 #define PCI236_INTR_DISABLE (PLX9052_INTCSR_LI1POL | \
45 PLX9052_INTCSR_LI2POL | \
46 PLX9052_INTCSR_LI1SEL | \
47 PLX9052_INTCSR_LI1CLRINT)
48
49 /* Enable, and clear, interrupts */
50 #define PCI236_INTR_ENABLE (PLX9052_INTCSR_LI1ENAB | \
51 PLX9052_INTCSR_LI1POL | \
52 PLX9052_INTCSR_LI2POL | \
53 PLX9052_INTCSR_PCIENAB | \
54 PLX9052_INTCSR_LI1SEL | \
55 PLX9052_INTCSR_LI1CLRINT)
56
pci236_intr_update_cb(struct comedi_device * dev,bool enable)57 static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
58 {
59 struct pc236_private *devpriv = dev->private;
60
61 /* this will also clear the "local interrupt 1" latch */
62 outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
63 devpriv->lcr_iobase + PLX9052_INTCSR);
64 }
65
pci236_intr_chk_clr_cb(struct comedi_device * dev)66 static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
67 {
68 struct pc236_private *devpriv = dev->private;
69
70 /* check if interrupt occurred */
71 if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
72 PLX9052_INTCSR_LI1STAT))
73 return false;
74 /* clear the interrupt */
75 pci236_intr_update_cb(dev, devpriv->enable_irq);
76 return true;
77 }
78
79 static const struct pc236_board pc236_pci_board = {
80 .name = "pci236",
81 .intr_update_cb = pci236_intr_update_cb,
82 .intr_chk_clr_cb = pci236_intr_chk_clr_cb,
83 };
84
pci236_auto_attach(struct comedi_device * dev,unsigned long context_unused)85 static int pci236_auto_attach(struct comedi_device *dev,
86 unsigned long context_unused)
87 {
88 struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
89 struct pc236_private *devpriv;
90 unsigned long iobase;
91 int ret;
92
93 dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
94 pci_name(pci_dev));
95
96 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
97 if (!devpriv)
98 return -ENOMEM;
99
100 dev->board_ptr = &pc236_pci_board;
101 dev->board_name = pc236_pci_board.name;
102 ret = comedi_pci_enable(dev);
103 if (ret)
104 return ret;
105
106 devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
107 iobase = pci_resource_start(pci_dev, 2);
108 return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
109 IRQF_SHARED);
110 }
111
112 static struct comedi_driver amplc_pci236_driver = {
113 .driver_name = "amplc_pci236",
114 .module = THIS_MODULE,
115 .auto_attach = pci236_auto_attach,
116 .detach = comedi_pci_detach,
117 };
118
119 static const struct pci_device_id pci236_pci_table[] = {
120 { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
121 { 0 }
122 };
123
124 MODULE_DEVICE_TABLE(pci, pci236_pci_table);
125
amplc_pci236_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)126 static int amplc_pci236_pci_probe(struct pci_dev *dev,
127 const struct pci_device_id *id)
128 {
129 return comedi_pci_auto_config(dev, &lc_pci236_driver,
130 id->driver_data);
131 }
132
133 static struct pci_driver amplc_pci236_pci_driver = {
134 .name = "amplc_pci236",
135 .id_table = pci236_pci_table,
136 .probe = &lc_pci236_pci_probe,
137 .remove = comedi_pci_auto_unconfig,
138 };
139
140 module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
141
142 MODULE_AUTHOR("Comedi https://www.comedi.org");
143 MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
144 MODULE_LICENSE("GPL");
145