| 1 | /* |
| 2 | |
| 3 | bt8xx GPIO abuser |
| 4 | |
| 5 | Copyright (C) 2008 Michael Buesch <m@bues.ch> |
| 6 | |
| 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. |
| 10 | |
| 11 | |
| 12 | Derived from the bt848 driver: |
| 13 | |
| 14 | Copyright (C) 1996,97,98 Ralph Metzler |
| 15 | & Marcus Metzler |
| 16 | (c) 1999-2002 Gerd Knorr |
| 17 | |
| 18 | some v4l2 code lines are taken from Justin's bttv2 driver which is |
| 19 | (c) 2000 Justin Schoeman |
| 20 | |
| 21 | V4L1 removal from: |
| 22 | (c) 2005-2006 Nickolay V. Shmyrev |
| 23 | |
| 24 | Fixes to be fully V4L2 compliant by |
| 25 | (c) 2006 Mauro Carvalho Chehab |
| 26 | |
| 27 | Cropping and overscan support |
| 28 | Copyright (C) 2005, 2006 Michael H. Schimek |
| 29 | Sponsored by OPQ Systems AB |
| 30 | |
| 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. |
| 35 | |
| 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. |
| 40 | |
| 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. |
| 44 | */ |
| 45 | |
| 46 | #include <linux/module.h> |
| 47 | #include <linux/pci.h> |
| 48 | #include <linux/spinlock.h> |
| 49 | #include <linux/gpio.h> |
| 50 | #include <linux/slab.h> |
| 51 | |
| 52 | /* Steal the hardware definitions from the bttv driver. */ |
| 53 | #include "../media/pci/bt8xx/bt848.h" |
| 54 | |
| 55 | |
| 56 | #define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */ |
| 57 | |
| 58 | |
| 59 | struct bt8xxgpio { |
| 60 | spinlock_t lock; |
| 61 | |
| 62 | void __iomem *mmio; |
| 63 | struct pci_dev *pdev; |
| 64 | struct gpio_chip gpio; |
| 65 | |
| 66 | #ifdef CONFIG_PM |
| 67 | u32 saved_outen; |
| 68 | u32 saved_data; |
| 69 | #endif |
| 70 | }; |
| 71 | |
| 72 | #define bgwrite(dat, adr) writel((dat), bg->mmio+(adr)) |
| 73 | #define bgread(adr) readl(bg->mmio+(adr)) |
| 74 | |
| 75 | |
| 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."); |
| 79 | |
| 80 | |
| 81 | static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) |
| 82 | { |
| 83 | struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); |
| 84 | unsigned long flags; |
| 85 | u32 outen, data; |
| 86 | |
| 87 | spin_lock_irqsave(&bg->lock, flags); |
| 88 | |
| 89 | data = bgread(BT848_GPIO_DATA); |
| 90 | data &= ~(1 << nr); |
| 91 | bgwrite(data, BT848_GPIO_DATA); |
| 92 | |
| 93 | outen = bgread(BT848_GPIO_OUT_EN); |
| 94 | outen &= ~(1 << nr); |
| 95 | bgwrite(outen, BT848_GPIO_OUT_EN); |
| 96 | |
| 97 | spin_unlock_irqrestore(&bg->lock, flags); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr) |
| 103 | { |
| 104 | struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); |
| 105 | unsigned long flags; |
| 106 | u32 val; |
| 107 | |
| 108 | spin_lock_irqsave(&bg->lock, flags); |
| 109 | val = bgread(BT848_GPIO_DATA); |
| 110 | spin_unlock_irqrestore(&bg->lock, flags); |
| 111 | |
| 112 | return !!(val & (1 << nr)); |
| 113 | } |
| 114 | |
| 115 | static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio, |
| 116 | unsigned nr, int val) |
| 117 | { |
| 118 | struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); |
| 119 | unsigned long flags; |
| 120 | u32 outen, data; |
| 121 | |
| 122 | spin_lock_irqsave(&bg->lock, flags); |
| 123 | |
| 124 | outen = bgread(BT848_GPIO_OUT_EN); |
| 125 | outen |= (1 << nr); |
| 126 | bgwrite(outen, BT848_GPIO_OUT_EN); |
| 127 | |
| 128 | data = bgread(BT848_GPIO_DATA); |
| 129 | if (val) |
| 130 | data |= (1 << nr); |
| 131 | else |
| 132 | data &= ~(1 << nr); |
| 133 | bgwrite(data, BT848_GPIO_DATA); |
| 134 | |
| 135 | spin_unlock_irqrestore(&bg->lock, flags); |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static void bt8xxgpio_gpio_set(struct gpio_chip *gpio, |
| 141 | unsigned nr, int val) |
| 142 | { |
| 143 | struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); |
| 144 | unsigned long flags; |
| 145 | u32 data; |
| 146 | |
| 147 | spin_lock_irqsave(&bg->lock, flags); |
| 148 | |
| 149 | data = bgread(BT848_GPIO_DATA); |
| 150 | if (val) |
| 151 | data |= (1 << nr); |
| 152 | else |
| 153 | data &= ~(1 << nr); |
| 154 | bgwrite(data, BT848_GPIO_DATA); |
| 155 | |
| 156 | spin_unlock_irqrestore(&bg->lock, flags); |
| 157 | } |
| 158 | |
| 159 | static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg) |
| 160 | { |
| 161 | struct gpio_chip *c = &bg->gpio; |
| 162 | |
| 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; |
| 169 | c->dbg_show = NULL; |
| 170 | c->base = modparam_gpiobase; |
| 171 | c->ngpio = BT8XXGPIO_NR_GPIOS; |
| 172 | c->can_sleep = false; |
| 173 | } |
| 174 | |
| 175 | static int bt8xxgpio_probe(struct pci_dev *dev, |
| 176 | const struct pci_device_id *pci_id) |
| 177 | { |
| 178 | struct bt8xxgpio *bg; |
| 179 | int err; |
| 180 | |
| 181 | bg = devm_kzalloc(&dev->dev, sizeof(struct bt8xxgpio), GFP_KERNEL); |
| 182 | if (!bg) |
| 183 | return -ENOMEM; |
| 184 | |
| 185 | bg->pdev = dev; |
| 186 | spin_lock_init(&bg->lock); |
| 187 | |
| 188 | err = pci_enable_device(dev); |
| 189 | if (err) { |
| 190 | printk(KERN_ERR "bt8xxgpio: Can't enable device.\n"); |
| 191 | return err; |
| 192 | } |
| 193 | if (!devm_request_mem_region(&dev->dev, pci_resource_start(dev, 0), |
| 194 | pci_resource_len(dev, 0), |
| 195 | "bt8xxgpio")) { |
| 196 | printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n", |
| 197 | (unsigned long long)pci_resource_start(dev, 0)); |
| 198 | err = -EBUSY; |
| 199 | goto err_disable; |
| 200 | } |
| 201 | pci_set_master(dev); |
| 202 | pci_set_drvdata(dev, bg); |
| 203 | |
| 204 | bg->mmio = devm_ioremap(&dev->dev, pci_resource_start(dev, 0), 0x1000); |
| 205 | if (!bg->mmio) { |
| 206 | printk(KERN_ERR "bt8xxgpio: ioremap() failed\n"); |
| 207 | err = -EIO; |
| 208 | goto err_disable; |
| 209 | } |
| 210 | |
| 211 | /* Disable interrupts */ |
| 212 | bgwrite(0, BT848_INT_MASK); |
| 213 | |
| 214 | /* gpio init */ |
| 215 | bgwrite(0, BT848_GPIO_DMA_CTL); |
| 216 | bgwrite(0, BT848_GPIO_REG_INP); |
| 217 | bgwrite(0, BT848_GPIO_OUT_EN); |
| 218 | |
| 219 | bt8xxgpio_gpio_setup(bg); |
| 220 | err = gpiochip_add(&bg->gpio); |
| 221 | if (err) { |
| 222 | printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n"); |
| 223 | goto err_disable; |
| 224 | } |
| 225 | |
| 226 | return 0; |
| 227 | |
| 228 | err_disable: |
| 229 | pci_disable_device(dev); |
| 230 | |
| 231 | return err; |
| 232 | } |
| 233 | |
| 234 | static void bt8xxgpio_remove(struct pci_dev *pdev) |
| 235 | { |
| 236 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); |
| 237 | |
| 238 | gpiochip_remove(&bg->gpio); |
| 239 | |
| 240 | bgwrite(0, BT848_INT_MASK); |
| 241 | bgwrite(~0x0, BT848_INT_STAT); |
| 242 | bgwrite(0x0, BT848_GPIO_OUT_EN); |
| 243 | |
| 244 | pci_disable_device(pdev); |
| 245 | } |
| 246 | |
| 247 | #ifdef CONFIG_PM |
| 248 | static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state) |
| 249 | { |
| 250 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); |
| 251 | unsigned long flags; |
| 252 | |
| 253 | spin_lock_irqsave(&bg->lock, flags); |
| 254 | |
| 255 | bg->saved_outen = bgread(BT848_GPIO_OUT_EN); |
| 256 | bg->saved_data = bgread(BT848_GPIO_DATA); |
| 257 | |
| 258 | bgwrite(0, BT848_INT_MASK); |
| 259 | bgwrite(~0x0, BT848_INT_STAT); |
| 260 | bgwrite(0x0, BT848_GPIO_OUT_EN); |
| 261 | |
| 262 | spin_unlock_irqrestore(&bg->lock, flags); |
| 263 | |
| 264 | pci_save_state(pdev); |
| 265 | pci_disable_device(pdev); |
| 266 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | static int bt8xxgpio_resume(struct pci_dev *pdev) |
| 272 | { |
| 273 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); |
| 274 | unsigned long flags; |
| 275 | int err; |
| 276 | |
| 277 | pci_set_power_state(pdev, PCI_D0); |
| 278 | err = pci_enable_device(pdev); |
| 279 | if (err) |
| 280 | return err; |
| 281 | pci_restore_state(pdev); |
| 282 | |
| 283 | spin_lock_irqsave(&bg->lock, flags); |
| 284 | |
| 285 | bgwrite(0, BT848_INT_MASK); |
| 286 | bgwrite(0, BT848_GPIO_DMA_CTL); |
| 287 | bgwrite(0, BT848_GPIO_REG_INP); |
| 288 | bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN); |
| 289 | bgwrite(bg->saved_data & bg->saved_outen, |
| 290 | BT848_GPIO_DATA); |
| 291 | |
| 292 | spin_unlock_irqrestore(&bg->lock, flags); |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | #else |
| 297 | #define bt8xxgpio_suspend NULL |
| 298 | #define bt8xxgpio_resume NULL |
| 299 | #endif /* CONFIG_PM */ |
| 300 | |
| 301 | static const struct pci_device_id bt8xxgpio_pci_tbl[] = { |
| 302 | { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) }, |
| 303 | { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) }, |
| 304 | { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) }, |
| 305 | { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) }, |
| 306 | { 0, }, |
| 307 | }; |
| 308 | MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl); |
| 309 | |
| 310 | static struct pci_driver bt8xxgpio_pci_driver = { |
| 311 | .name = "bt8xxgpio", |
| 312 | .id_table = bt8xxgpio_pci_tbl, |
| 313 | .probe = bt8xxgpio_probe, |
| 314 | .remove = bt8xxgpio_remove, |
| 315 | .suspend = bt8xxgpio_suspend, |
| 316 | .resume = bt8xxgpio_resume, |
| 317 | }; |
| 318 | |
| 319 | module_pci_driver(bt8xxgpio_pci_driver); |
| 320 | |
| 321 | MODULE_LICENSE("GPL"); |
| 322 | MODULE_AUTHOR("Michael Buesch"); |
| 323 | MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card"); |