5 Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
7 Please do _only_ contact the people listed _above_ with issues related to this driver.
8 All the other people listed below are not related to this driver. Their names
9 are only here, because this driver is derived from the bt848 driver.
12 Derived from the bt848 driver:
14 Copyright (C) 1996,97,98 Ralph Metzler
16 (c) 1999-2002 Gerd Knorr
18 some v4l2 code lines are taken from Justin's bttv2 driver which is
19 (c) 2000 Justin Schoeman
22 (c) 2005-2006 Nickolay V. Shmyrev
24 Fixes to be fully V4L2 compliant by
25 (c) 2006 Mauro Carvalho Chehab
27 Cropping and overscan support
28 Copyright (C) 2005, 2006 Michael H. Schimek
29 Sponsored by OPQ Systems AB
31 This program is free software; you can redistribute it and/or modify
32 it under the terms of the GNU General Public License as published by
33 the Free Software Foundation; either version 2 of the License, or
34 (at your option) any later version.
36 This program is distributed in the hope that it will be useful,
37 but WITHOUT ANY WARRANTY; without even the implied warranty of
38 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39 GNU General Public License for more details.
41 You should have received a copy of the GNU General Public License
42 along with this program; if not, write to the Free Software
43 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
46 #include <linux/module.h>
47 #include <linux/pci.h>
48 #include <linux/spinlock.h>
52 /* Steal the hardware definitions from the bttv driver. */
53 #include "../media/video/bt8xx/bt848.h"
56 #define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */
64 struct gpio_chip gpio;
72 #define bgwrite(dat, adr) writel((dat), bg->mmio+(adr))
73 #define bgread(adr) readl(bg->mmio+(adr))
76 static int modparam_gpiobase = -1/* dynamic */;
77 module_param_named(gpiobase, modparam_gpiobase, int, 0444);
78 MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
81 static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
83 struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
87 spin_lock_irqsave(&bg->lock, flags);
89 data = bgread(BT848_GPIO_DATA);
91 bgwrite(data, BT848_GPIO_DATA);
93 outen = bgread(BT848_GPIO_OUT_EN);
95 bgwrite(outen, BT848_GPIO_OUT_EN);
97 spin_unlock_irqrestore(&bg->lock, flags);
102 static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
104 struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
108 spin_lock_irqsave(&bg->lock, flags);
109 val = bgread(BT848_GPIO_DATA);
110 spin_unlock_irqrestore(&bg->lock, flags);
112 return !!(val & (1 << nr));
115 static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
116 unsigned nr, int val)
118 struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
122 spin_lock_irqsave(&bg->lock, flags);
124 outen = bgread(BT848_GPIO_OUT_EN);
126 bgwrite(outen, BT848_GPIO_OUT_EN);
128 data = bgread(BT848_GPIO_DATA);
133 bgwrite(data, BT848_GPIO_DATA);
135 spin_unlock_irqrestore(&bg->lock, flags);
140 static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
141 unsigned nr, int val)
143 struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
147 spin_lock_irqsave(&bg->lock, flags);
149 data = bgread(BT848_GPIO_DATA);
154 bgwrite(data, BT848_GPIO_DATA);
156 spin_unlock_irqrestore(&bg->lock, flags);
159 static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
161 struct gpio_chip *c = &bg->gpio;
163 c->label = dev_name(&bg->pdev->dev);
164 c->owner = THIS_MODULE;
165 c->direction_input = bt8xxgpio_gpio_direction_input;
166 c->get = bt8xxgpio_gpio_get;
167 c->direction_output = bt8xxgpio_gpio_direction_output;
168 c->set = bt8xxgpio_gpio_set;
170 c->base = modparam_gpiobase;
171 c->ngpio = BT8XXGPIO_NR_GPIOS;
175 static int bt8xxgpio_probe(struct pci_dev *dev,
176 const struct pci_device_id *pci_id)
178 struct bt8xxgpio *bg;
181 bg = kzalloc(sizeof(*bg), GFP_KERNEL);
186 spin_lock_init(&bg->lock);
188 err = pci_enable_device(dev);
190 printk(KERN_ERR "bt8xxgpio: Can't enable device.\n");
193 if (!request_mem_region(pci_resource_start(dev, 0),
194 pci_resource_len(dev, 0),
196 printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n",
197 (unsigned long long)pci_resource_start(dev, 0));
202 pci_set_drvdata(dev, bg);
204 bg->mmio = ioremap(pci_resource_start(dev, 0), 0x1000);
206 printk(KERN_ERR "bt8xxgpio: ioremap() failed\n");
208 goto err_release_mem;
211 /* Disable interrupts */
212 bgwrite(0, BT848_INT_MASK);
215 bgwrite(0, BT848_GPIO_DMA_CTL);
216 bgwrite(0, BT848_GPIO_REG_INP);
217 bgwrite(0, BT848_GPIO_OUT_EN);
219 bt8xxgpio_gpio_setup(bg);
220 err = gpiochip_add(&bg->gpio);
222 printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n");
223 goto err_release_mem;
226 printk(KERN_INFO "bt8xxgpio: Abusing BT8xx card for GPIOs %d to %d\n",
227 bg->gpio.base, bg->gpio.base + BT8XXGPIO_NR_GPIOS - 1);
232 release_mem_region(pci_resource_start(dev, 0),
233 pci_resource_len(dev, 0));
234 pci_set_drvdata(dev, NULL);
236 pci_disable_device(dev);
243 static void bt8xxgpio_remove(struct pci_dev *pdev)
245 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
247 gpiochip_remove(&bg->gpio);
249 bgwrite(0, BT848_INT_MASK);
250 bgwrite(~0x0, BT848_INT_STAT);
251 bgwrite(0x0, BT848_GPIO_OUT_EN);
254 release_mem_region(pci_resource_start(pdev, 0),
255 pci_resource_len(pdev, 0));
256 pci_disable_device(pdev);
258 pci_set_drvdata(pdev, NULL);
263 static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
265 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
268 spin_lock_irqsave(&bg->lock, flags);
270 bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
271 bg->saved_data = bgread(BT848_GPIO_DATA);
273 bgwrite(0, BT848_INT_MASK);
274 bgwrite(~0x0, BT848_INT_STAT);
275 bgwrite(0x0, BT848_GPIO_OUT_EN);
277 spin_unlock_irqrestore(&bg->lock, flags);
279 pci_save_state(pdev);
280 pci_disable_device(pdev);
281 pci_set_power_state(pdev, pci_choose_state(pdev, state));
286 static int bt8xxgpio_resume(struct pci_dev *pdev)
288 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
292 pci_set_power_state(pdev, 0);
293 err = pci_enable_device(pdev);
296 pci_restore_state(pdev);
298 spin_lock_irqsave(&bg->lock, flags);
300 bgwrite(0, BT848_INT_MASK);
301 bgwrite(0, BT848_GPIO_DMA_CTL);
302 bgwrite(0, BT848_GPIO_REG_INP);
303 bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
304 bgwrite(bg->saved_data & bg->saved_outen,
307 spin_unlock_irqrestore(&bg->lock, flags);
312 #define bt8xxgpio_suspend NULL
313 #define bt8xxgpio_resume NULL
314 #endif /* CONFIG_PM */
316 static struct pci_device_id bt8xxgpio_pci_tbl[] = {
317 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
318 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
319 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
320 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
323 MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
325 static struct pci_driver bt8xxgpio_pci_driver = {
327 .id_table = bt8xxgpio_pci_tbl,
328 .probe = bt8xxgpio_probe,
329 .remove = bt8xxgpio_remove,
330 .suspend = bt8xxgpio_suspend,
331 .resume = bt8xxgpio_resume,
334 static int bt8xxgpio_init(void)
336 return pci_register_driver(&bt8xxgpio_pci_driver);
338 module_init(bt8xxgpio_init)
340 static void bt8xxgpio_exit(void)
342 pci_unregister_driver(&bt8xxgpio_pci_driver);
344 module_exit(bt8xxgpio_exit)
346 MODULE_LICENSE("GPL");
347 MODULE_AUTHOR("Michael Buesch");
348 MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");