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/driver.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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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_data(&bg->gpio, bg); 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"); 324