312 lines
7.0 KiB
C
312 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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bt8xx GPIO abuser
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Copyright (C) 2008 Michael Buesch <m@bues.ch>
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Please do _only_ contact the people listed _above_ with issues related to this driver.
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All the other people listed below are not related to this driver. Their names
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are only here, because this driver is derived from the bt848 driver.
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Derived from the bt848 driver:
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Copyright (C) 1996,97,98 Ralph Metzler
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& Marcus Metzler
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(c) 1999-2002 Gerd Knorr
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some v4l2 code lines are taken from Justin's bttv2 driver which is
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(c) 2000 Justin Schoeman
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V4L1 removal from:
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(c) 2005-2006 Nickolay V. Shmyrev
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Fixes to be fully V4L2 compliant by
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(c) 2006 Mauro Carvalho Chehab
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Cropping and overscan support
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Copyright (C) 2005, 2006 Michael H. Schimek
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Sponsored by OPQ Systems AB
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <linux/gpio/driver.h>
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#include <linux/slab.h>
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/* Steal the hardware definitions from the bttv driver. */
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#include "../media/pci/bt8xx/bt848.h"
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#define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */
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struct bt8xxgpio {
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spinlock_t lock;
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void __iomem *mmio;
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struct pci_dev *pdev;
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struct gpio_chip gpio;
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#ifdef CONFIG_PM
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u32 saved_outen;
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u32 saved_data;
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#endif
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};
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#define bgwrite(dat, adr) writel((dat), bg->mmio+(adr))
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#define bgread(adr) readl(bg->mmio+(adr))
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static int modparam_gpiobase = -1/* dynamic */;
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module_param_named(gpiobase, modparam_gpiobase, int, 0444);
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MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
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static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
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{
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struct bt8xxgpio *bg = gpiochip_get_data(gpio);
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unsigned long flags;
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u32 outen, data;
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spin_lock_irqsave(&bg->lock, flags);
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data = bgread(BT848_GPIO_DATA);
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data &= ~(1 << nr);
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bgwrite(data, BT848_GPIO_DATA);
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outen = bgread(BT848_GPIO_OUT_EN);
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outen &= ~(1 << nr);
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bgwrite(outen, BT848_GPIO_OUT_EN);
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spin_unlock_irqrestore(&bg->lock, flags);
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return 0;
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}
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static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
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{
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struct bt8xxgpio *bg = gpiochip_get_data(gpio);
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&bg->lock, flags);
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val = bgread(BT848_GPIO_DATA);
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spin_unlock_irqrestore(&bg->lock, flags);
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return !!(val & (1 << nr));
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}
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static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
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unsigned nr, int val)
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{
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struct bt8xxgpio *bg = gpiochip_get_data(gpio);
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unsigned long flags;
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u32 outen, data;
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spin_lock_irqsave(&bg->lock, flags);
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outen = bgread(BT848_GPIO_OUT_EN);
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outen |= (1 << nr);
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bgwrite(outen, BT848_GPIO_OUT_EN);
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data = bgread(BT848_GPIO_DATA);
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if (val)
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data |= (1 << nr);
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else
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data &= ~(1 << nr);
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bgwrite(data, BT848_GPIO_DATA);
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spin_unlock_irqrestore(&bg->lock, flags);
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return 0;
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}
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static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
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unsigned nr, int val)
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{
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struct bt8xxgpio *bg = gpiochip_get_data(gpio);
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unsigned long flags;
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u32 data;
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spin_lock_irqsave(&bg->lock, flags);
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data = bgread(BT848_GPIO_DATA);
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if (val)
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data |= (1 << nr);
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else
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data &= ~(1 << nr);
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bgwrite(data, BT848_GPIO_DATA);
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spin_unlock_irqrestore(&bg->lock, flags);
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}
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static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
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{
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struct gpio_chip *c = &bg->gpio;
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c->label = dev_name(&bg->pdev->dev);
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c->owner = THIS_MODULE;
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c->direction_input = bt8xxgpio_gpio_direction_input;
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c->get = bt8xxgpio_gpio_get;
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c->direction_output = bt8xxgpio_gpio_direction_output;
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c->set = bt8xxgpio_gpio_set;
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c->dbg_show = NULL;
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c->base = modparam_gpiobase;
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c->ngpio = BT8XXGPIO_NR_GPIOS;
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c->can_sleep = false;
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}
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static int bt8xxgpio_probe(struct pci_dev *dev,
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const struct pci_device_id *pci_id)
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{
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struct bt8xxgpio *bg;
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int err;
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bg = devm_kzalloc(&dev->dev, sizeof(struct bt8xxgpio), GFP_KERNEL);
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if (!bg)
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return -ENOMEM;
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bg->pdev = dev;
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spin_lock_init(&bg->lock);
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err = pci_enable_device(dev);
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if (err) {
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dev_err(&dev->dev, "can't enable device.\n");
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return err;
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}
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if (!devm_request_mem_region(&dev->dev, pci_resource_start(dev, 0),
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pci_resource_len(dev, 0),
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"bt8xxgpio")) {
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dev_warn(&dev->dev, "can't request iomem (0x%llx).\n",
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(unsigned long long)pci_resource_start(dev, 0));
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err = -EBUSY;
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goto err_disable;
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}
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pci_set_master(dev);
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pci_set_drvdata(dev, bg);
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bg->mmio = devm_ioremap(&dev->dev, pci_resource_start(dev, 0), 0x1000);
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if (!bg->mmio) {
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dev_err(&dev->dev, "ioremap() failed\n");
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err = -EIO;
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goto err_disable;
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}
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/* Disable interrupts */
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bgwrite(0, BT848_INT_MASK);
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/* gpio init */
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bgwrite(0, BT848_GPIO_DMA_CTL);
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bgwrite(0, BT848_GPIO_REG_INP);
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bgwrite(0, BT848_GPIO_OUT_EN);
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bt8xxgpio_gpio_setup(bg);
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err = gpiochip_add_data(&bg->gpio, bg);
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if (err) {
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dev_err(&dev->dev, "failed to register GPIOs\n");
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goto err_disable;
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}
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return 0;
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err_disable:
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pci_disable_device(dev);
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return err;
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}
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static void bt8xxgpio_remove(struct pci_dev *pdev)
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{
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struct bt8xxgpio *bg = pci_get_drvdata(pdev);
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gpiochip_remove(&bg->gpio);
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bgwrite(0, BT848_INT_MASK);
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bgwrite(~0x0, BT848_INT_STAT);
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bgwrite(0x0, BT848_GPIO_OUT_EN);
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pci_disable_device(pdev);
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}
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#ifdef CONFIG_PM
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static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
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{
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struct bt8xxgpio *bg = pci_get_drvdata(pdev);
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unsigned long flags;
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spin_lock_irqsave(&bg->lock, flags);
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bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
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bg->saved_data = bgread(BT848_GPIO_DATA);
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bgwrite(0, BT848_INT_MASK);
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bgwrite(~0x0, BT848_INT_STAT);
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bgwrite(0x0, BT848_GPIO_OUT_EN);
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spin_unlock_irqrestore(&bg->lock, flags);
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pci_save_state(pdev);
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pci_disable_device(pdev);
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pci_set_power_state(pdev, pci_choose_state(pdev, state));
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return 0;
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}
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static int bt8xxgpio_resume(struct pci_dev *pdev)
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{
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struct bt8xxgpio *bg = pci_get_drvdata(pdev);
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unsigned long flags;
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int err;
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pci_set_power_state(pdev, PCI_D0);
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err = pci_enable_device(pdev);
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if (err)
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return err;
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pci_restore_state(pdev);
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spin_lock_irqsave(&bg->lock, flags);
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bgwrite(0, BT848_INT_MASK);
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bgwrite(0, BT848_GPIO_DMA_CTL);
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bgwrite(0, BT848_GPIO_REG_INP);
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bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
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bgwrite(bg->saved_data & bg->saved_outen,
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BT848_GPIO_DATA);
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spin_unlock_irqrestore(&bg->lock, flags);
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return 0;
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}
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#else
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#define bt8xxgpio_suspend NULL
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#define bt8xxgpio_resume NULL
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#endif /* CONFIG_PM */
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static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
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{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
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{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
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{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
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static struct pci_driver bt8xxgpio_pci_driver = {
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.name = "bt8xxgpio",
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.id_table = bt8xxgpio_pci_tbl,
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.probe = bt8xxgpio_probe,
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.remove = bt8xxgpio_remove,
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.suspend = bt8xxgpio_suspend,
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.resume = bt8xxgpio_resume,
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};
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module_pci_driver(bt8xxgpio_pci_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michael Buesch");
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MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");
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