Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / comedi / drivers / amplc_pci236.c

diff --git a/kernel/drivers/staging/comedi/drivers/amplc_pci236.c b/kernel/drivers/staging/comedi/drivers/amplc_pci236.c
new file mode 100644 (file)
index 0000000..31cc38b
--- /dev/null
+++ b/kernel/drivers/staging/comedi/drivers/amplc_pci236.c
@@ -0,0 +1,153 @@
+/*
+ * comedi/drivers/amplc_pci236.c
+ * Driver for Amplicon PCI236 DIO boards.
+ *
+ * Copyright (C) 2002-2014 MEV Ltd. <http://www.mev.co.uk/>
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+/*
+ * Driver: amplc_pci236
+ * Description: Amplicon PCI236
+ * Author: Ian Abbott <abbotti@mev.co.uk>
+ * Devices: [Amplicon] PCI236 (amplc_pci236)
+ * Updated: Fri, 25 Jul 2014 15:32:40 +0000
+ * Status: works
+ *
+ * Configuration options:
+ *   none
+ *
+ * Manual configuration of PCI board (PCI236) is not supported; it is
+ * configured automatically.
+ *
+ * The PCI236 board has a single 8255 appearing as subdevice 0.
+ *
+ * Subdevice 1 pretends to be a digital input device, but it always
+ * returns 0 when read. However, if you run a command with
+ * scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
+ * external trigger, which can be used to wake up tasks.  This is like
+ * the comedi_parport device.  If no interrupt is connected, then
+ * subdevice 1 is unused.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+#include "../comedi_pci.h"
+
+#include "amplc_pc236.h"
+#include "plx9052.h"
+
+/* Disable, and clear, interrupts */
+#define PCI236_INTR_DISABLE    (PLX9052_INTCSR_LI1POL |        \
+                                PLX9052_INTCSR_LI2POL |        \
+                                PLX9052_INTCSR_LI1SEL |        \
+                                PLX9052_INTCSR_LI1CLRINT)
+
+/* Enable, and clear, interrupts */
+#define PCI236_INTR_ENABLE     (PLX9052_INTCSR_LI1ENAB |       \
+                                PLX9052_INTCSR_LI1POL |        \
+                                PLX9052_INTCSR_LI2POL |        \
+                                PLX9052_INTCSR_PCIENAB |       \
+                                PLX9052_INTCSR_LI1SEL |        \
+                                PLX9052_INTCSR_LI1CLRINT)
+
+static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
+{
+       struct pc236_private *devpriv = dev->private;
+
+       /* this will also clear the "local interrupt 1" latch */
+       outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
+            devpriv->lcr_iobase + PLX9052_INTCSR);
+}
+
+static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
+{
+       struct pc236_private *devpriv = dev->private;
+
+       /* check if interrupt occurred */
+       if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
+             PLX9052_INTCSR_LI1STAT))
+               return false;
+       /* clear the interrupt */
+       pci236_intr_update_cb(dev, devpriv->enable_irq);
+       return true;
+}
+
+static const struct pc236_board pc236_pci_board = {
+       .name = "pci236",
+       .intr_update_cb = pci236_intr_update_cb,
+       .intr_chk_clr_cb = pci236_intr_chk_clr_cb,
+};
+
+static int pci236_auto_attach(struct comedi_device *dev,
+                             unsigned long context_unused)
+{
+       struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
+       struct pc236_private *devpriv;
+       unsigned long iobase;
+       int ret;
+
+       dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
+                pci_name(pci_dev));
+
+       devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+       if (!devpriv)
+               return -ENOMEM;
+
+       dev->board_ptr = &pc236_pci_board;
+       dev->board_name = pc236_pci_board.name;
+       ret = comedi_pci_enable(dev);
+       if (ret)
+               return ret;
+
+       devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
+       iobase = pci_resource_start(pci_dev, 2);
+       return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
+                                        IRQF_SHARED);
+}
+
+static struct comedi_driver amplc_pci236_driver = {
+       .driver_name = "amplc_pci236",
+       .module = THIS_MODULE,
+       .auto_attach = pci236_auto_attach,
+       .detach = comedi_pci_detach,
+};
+
+static const struct pci_device_id pci236_pci_table[] = {
+       { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
+       { 0 }
+};
+
+MODULE_DEVICE_TABLE(pci, pci236_pci_table);
+
+static int amplc_pci236_pci_probe(struct pci_dev *dev,
+                                 const struct pci_device_id *id)
+{
+       return comedi_pci_auto_config(dev, &amplc_pci236_driver,
+                                     id->driver_data);
+}
+
+static struct pci_driver amplc_pci236_pci_driver = {
+       .name           = "amplc_pci236",
+       .id_table       = pci236_pci_table,
+       .probe          = &amplc_pci236_pci_probe,
+       .remove         = comedi_pci_auto_unconfig,
+};
+
+module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
+MODULE_LICENSE("GPL");