3 files changed, 367 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 6ec0e35b98e3..de202dbe5300 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -83,6 +83,24 @@ config GPIO_PCF857X
           This driver provides an in-kernel interface to those GPIOs using
           platform-neutral GPIO calls.
 
+comment "PCI GPIO expanders:"
+
+config GPIO_BT8XX
+        tristate "BT8XX GPIO abuser"
+        depends on PCI && VIDEO_BT848=n
+        help
+          The BT8xx frame grabber chip has 24 GPIO pins than can be abused
+          as a cheap PCI GPIO card.
+
+          This chip can be found on Miro, Hauppauge and STB TV-cards.
+
+          The card needs to be physically altered for using it as a
+          GPIO card. For more information on how to build a GPIO card
+          from a BT8xx TV card, see the documentation file at
+          Documentation/bt8xxgpio.txt
+
+          If unsure, say N.
+
 comment "SPI GPIO expanders:"
 
 config GPIO_MAX7301
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 16e796dc5410..eeb2f2b20282 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_GPIO_MAX7301)	+= max7301.o
 obj-$(CONFIG_GPIO_MCP23S08)     += mcp23s08.o
 obj-$(CONFIG_GPIO_PCA953X)      += pca953x.o
 obj-$(CONFIG_GPIO_PCF857X)      += pcf857x.o
+obj-$(CONFIG_GPIO_BT8XX)        += bt8xxgpio.o
diff --git a/drivers/gpio/bt8xxgpio.c b/drivers/gpio/bt8xxgpio.c
new file mode 100644
index 000000000000..7a1168249dd5
--- /dev/null
+++ b/drivers/gpio/bt8xxgpio.c
@@ -0,0 +1,348 @@
+/*
+
+    bt8xx GPIO abuser
+
+    Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
+
+    Please do _only_ contact the people listed _above_ with issues related to this driver.
+    All the other people listed below are not related to this driver. Their names
+    are only here, because this driver is derived from the bt848 driver.
+
+
+    Derived from the bt848 driver:
+
+    Copyright (C) 1996,97,98 Ralph  Metzler
+                           & Marcus Metzler
+    (c) 1999-2002 Gerd Knorr
+
+    some v4l2 code lines are taken from Justin's bttv2 driver which is
+    (c) 2000 Justin Schoeman
+
+    V4L1 removal from:
+    (c) 2005-2006 Nickolay V. Shmyrev
+
+    Fixes to be fully V4L2 compliant by
+    (c) 2006 Mauro Carvalho Chehab
+
+    Cropping and overscan support
+    Copyright (C) 2005, 2006 Michael H. Schimek
+    Sponsored by OPQ Systems AB
+
+    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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+
+#include <asm/gpio.h>
+
+/* Steal the hardware definitions from the bttv driver. */
+#include "../media/video/bt8xx/bt848.h"
+
+
+#define BT8XXGPIO_NR_GPIOS              24 /* We have 24 GPIO pins */
+
+
+struct bt8xxgpio {
+        spinlock_t lock;
+
+        void __iomem *mmio;
+        struct pci_dev *pdev;
+        struct gpio_chip gpio;
+
+#ifdef CONFIG_PM
+        u32 saved_outen;
+        u32 saved_data;
+#endif
+};
+
+#define bgwrite(dat, adr)       writel((dat), bg->mmio+(adr))
+#define bgread(adr)             readl(bg->mmio+(adr))
+
+
+static int modparam_gpiobase = -1/* dynamic */;
+module_param_named(gpiobase, modparam_gpiobase, int, 0444);
+MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
+
+
+static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
+{
+        struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
+        unsigned long flags;
+        u32 outen, data;
+
+        spin_lock_irqsave(&bg->lock, flags);
+
+        data = bgread(BT848_GPIO_DATA);
+        data &= ~(1 << nr);
+        bgwrite(data, BT848_GPIO_DATA);
+
+        outen = bgread(BT848_GPIO_OUT_EN);
+        outen &= ~(1 << nr);
+        bgwrite(outen, BT848_GPIO_OUT_EN);
+
+        spin_unlock_irqrestore(&bg->lock, flags);
+
+        return 0;
+}
+
+static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
+{
+        struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
+        unsigned long flags;
+        u32 val;
+
+        spin_lock_irqsave(&bg->lock, flags);
+        val = bgread(BT848_GPIO_DATA);
+        spin_unlock_irqrestore(&bg->lock, flags);
+
+        return !!(val & (1 << nr));
+}
+
+static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
+                                        unsigned nr, int val)
+{
+        struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
+        unsigned long flags;
+        u32 outen, data;
+
+        spin_lock_irqsave(&bg->lock, flags);
+
+        outen = bgread(BT848_GPIO_OUT_EN);
+        outen |= (1 << nr);
+        bgwrite(outen, BT848_GPIO_OUT_EN);
+
+        data = bgread(BT848_GPIO_DATA);
+        if (val)
+                data |= (1 << nr);
+        else
+                data &= ~(1 << nr);
+        bgwrite(data, BT848_GPIO_DATA);
+
+        spin_unlock_irqrestore(&bg->lock, flags);
+
+        return 0;
+}
+
+static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
+                            unsigned nr, int val)
+{
+        struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
+        unsigned long flags;
+        u32 data;
+
+        spin_lock_irqsave(&bg->lock, flags);
+
+        data = bgread(BT848_GPIO_DATA);
+        if (val)
+                data |= (1 << nr);
+        else
+                data &= ~(1 << nr);
+        bgwrite(data, BT848_GPIO_DATA);
+
+        spin_unlock_irqrestore(&bg->lock, flags);
+}
+
+static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
+{
+        struct gpio_chip *c = &bg->gpio;
+
+        c->label = bg->pdev->dev.bus_id;
+        c->owner = THIS_MODULE;
+        c->direction_input = bt8xxgpio_gpio_direction_input;
+        c->get = bt8xxgpio_gpio_get;
+        c->direction_output = bt8xxgpio_gpio_direction_output;
+        c->set = bt8xxgpio_gpio_set;
+        c->dbg_show = NULL;
+        c->base = modparam_gpiobase;
+        c->ngpio = BT8XXGPIO_NR_GPIOS;
+        c->can_sleep = 0;
+}
+
+static int bt8xxgpio_probe(struct pci_dev *dev,
+                        const struct pci_device_id *pci_id)
+{
+        struct bt8xxgpio *bg;
+        int err;
+
+        bg = kzalloc(sizeof(*bg), GFP_KERNEL);
+        if (!bg)
+                return -ENOMEM;
+
+        bg->pdev = dev;
+        spin_lock_init(&bg->lock);
+
+        err = pci_enable_device(dev);
+        if (err) {
+                printk(KERN_ERR "bt8xxgpio: Can't enable device.\n");
+                goto err_freebg;
+        }
+        if (!request_mem_region(pci_resource_start(dev, 0),
+                                pci_resource_len(dev, 0),
+                                "bt8xxgpio")) {
+                printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n",
+                       (unsigned long long)pci_resource_start(dev, 0));
+                err = -EBUSY;
+                goto err_disable;
+        }
+        pci_set_master(dev);
+        pci_set_drvdata(dev, bg);
+
+        bg->mmio = ioremap(pci_resource_start(dev, 0), 0x1000);
+        if (!bg->mmio) {
+                printk(KERN_ERR "bt8xxgpio: ioremap() failed\n");
+                err = -EIO;
+                goto err_release_mem;
+        }
+
+        /* Disable interrupts */
+        bgwrite(0, BT848_INT_MASK);
+
+        /* gpio init */
+        bgwrite(0, BT848_GPIO_DMA_CTL);
+        bgwrite(0, BT848_GPIO_REG_INP);
+        bgwrite(0, BT848_GPIO_OUT_EN);
+
+        bt8xxgpio_gpio_setup(bg);
+        err = gpiochip_add(&bg->gpio);
+        if (err) {
+                printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n");
+                goto err_release_mem;
+        }
+
+        printk(KERN_INFO "bt8xxgpio: Abusing BT8xx card for GPIOs %d to %d\n",
+               bg->gpio.base, bg->gpio.base + BT8XXGPIO_NR_GPIOS - 1);
+
+        return 0;
+
+err_release_mem:
+        release_mem_region(pci_resource_start(dev, 0),
+                           pci_resource_len(dev, 0));
+        pci_set_drvdata(dev, NULL);
+err_disable:
+        pci_disable_device(dev);
+err_freebg:
+        kfree(bg);
+
+        return err;
+}
+
+static void bt8xxgpio_remove(struct pci_dev *pdev)
+{
+        struct bt8xxgpio *bg = pci_get_drvdata(pdev);
+
+        gpiochip_remove(&bg->gpio);
+
+        bgwrite(0, BT848_INT_MASK);
+        bgwrite(~0x0, BT848_INT_STAT);
+        bgwrite(0x0, BT848_GPIO_OUT_EN);
+
+        iounmap(bg->mmio);
+        release_mem_region(pci_resource_start(pdev, 0),
+                           pci_resource_len(pdev, 0));
+        pci_disable_device(pdev);
+
+        pci_set_drvdata(pdev, NULL);
+        kfree(bg);
+}
+
+#ifdef CONFIG_PM
+static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        struct bt8xxgpio *bg = pci_get_drvdata(pdev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&bg->lock, flags);
+
+        bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
+        bg->saved_data = bgread(BT848_GPIO_DATA);
+
+        bgwrite(0, BT848_INT_MASK);
+        bgwrite(~0x0, BT848_INT_STAT);
+        bgwrite(0x0, BT848_GPIO_OUT_EN);
+
+        spin_unlock_irqrestore(&bg->lock, flags);
+
+        pci_save_state(pdev);
+        pci_disable_device(pdev);
+        pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+        return 0;
+}
+
+static int bt8xxgpio_resume(struct pci_dev *pdev)
+{
+        struct bt8xxgpio *bg = pci_get_drvdata(pdev);
+        unsigned long flags;
+        int err;
+
+        pci_set_power_state(pdev, 0);
+        err = pci_enable_device(pdev);
+        if (err)
+                return err;
+        pci_restore_state(pdev);
+
+        spin_lock_irqsave(&bg->lock, flags);
+
+        bgwrite(0, BT848_INT_MASK);
+        bgwrite(0, BT848_GPIO_DMA_CTL);
+        bgwrite(0, BT848_GPIO_REG_INP);
+        bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
+        bgwrite(bg->saved_data & bg->saved_outen,
+                BT848_GPIO_DATA);
+
+        spin_unlock_irqrestore(&bg->lock, flags);
+
+        return 0;
+}
+#else
+#define bt8xxgpio_suspend NULL
+#define bt8xxgpio_resume NULL
+#endif /* CONFIG_PM */
+
+static struct pci_device_id bt8xxgpio_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
+        { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
+        { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
+        { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
+        { 0, },
+};
+MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
+
+static struct pci_driver bt8xxgpio_pci_driver = {
+        .name           = "bt8xxgpio",
+        .id_table       = bt8xxgpio_pci_tbl,
+        .probe          = bt8xxgpio_probe,
+        .remove         = bt8xxgpio_remove,
+        .suspend        = bt8xxgpio_suspend,
+        .resume         = bt8xxgpio_resume,
+};
+
+static int bt8xxgpio_init(void)
+{
+        return pci_register_driver(&bt8xxgpio_pci_driver);
+}
+module_init(bt8xxgpio_init)
+
+static void bt8xxgpio_exit(void)
+{
+        pci_unregister_driver(&bt8xxgpio_pci_driver);
+}
+module_exit(bt8xxgpio_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Buesch");
+MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");