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ff1d5c2f MB |
1 | /* |
2 | ||
3 | bt8xx GPIO abuser | |
4 | ||
5 | Copyright (C) 2008 Michael Buesch <mb@bu3sch.de> | |
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 | ||
50 | #include <asm/gpio.h> | |
51 | ||
52 | /* Steal the hardware definitions from the bttv driver. */ | |
53 | #include "../media/video/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 = bg->pdev->dev.bus_id; | |
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 = 0; | |
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 = kzalloc(sizeof(*bg), 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 | goto err_freebg; | |
192 | } | |
193 | if (!request_mem_region(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 = ioremap(pci_resource_start(dev, 0), 0x1000); | |
205 | if (!bg->mmio) { | |
206 | printk(KERN_ERR "bt8xxgpio: ioremap() failed\n"); | |
207 | err = -EIO; | |
208 | goto err_release_mem; | |
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_release_mem; | |
224 | } | |
225 | ||
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); | |
228 | ||
229 | return 0; | |
230 | ||
231 | err_release_mem: | |
232 | release_mem_region(pci_resource_start(dev, 0), | |
233 | pci_resource_len(dev, 0)); | |
234 | pci_set_drvdata(dev, NULL); | |
235 | err_disable: | |
236 | pci_disable_device(dev); | |
237 | err_freebg: | |
238 | kfree(bg); | |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
243 | static void bt8xxgpio_remove(struct pci_dev *pdev) | |
244 | { | |
245 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); | |
246 | ||
247 | gpiochip_remove(&bg->gpio); | |
248 | ||
249 | bgwrite(0, BT848_INT_MASK); | |
250 | bgwrite(~0x0, BT848_INT_STAT); | |
251 | bgwrite(0x0, BT848_GPIO_OUT_EN); | |
252 | ||
253 | iounmap(bg->mmio); | |
254 | release_mem_region(pci_resource_start(pdev, 0), | |
255 | pci_resource_len(pdev, 0)); | |
256 | pci_disable_device(pdev); | |
257 | ||
258 | pci_set_drvdata(pdev, NULL); | |
259 | kfree(bg); | |
260 | } | |
261 | ||
262 | #ifdef CONFIG_PM | |
263 | static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state) | |
264 | { | |
265 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); | |
266 | unsigned long flags; | |
267 | ||
268 | spin_lock_irqsave(&bg->lock, flags); | |
269 | ||
270 | bg->saved_outen = bgread(BT848_GPIO_OUT_EN); | |
271 | bg->saved_data = bgread(BT848_GPIO_DATA); | |
272 | ||
273 | bgwrite(0, BT848_INT_MASK); | |
274 | bgwrite(~0x0, BT848_INT_STAT); | |
275 | bgwrite(0x0, BT848_GPIO_OUT_EN); | |
276 | ||
277 | spin_unlock_irqrestore(&bg->lock, flags); | |
278 | ||
279 | pci_save_state(pdev); | |
280 | pci_disable_device(pdev); | |
281 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int bt8xxgpio_resume(struct pci_dev *pdev) | |
287 | { | |
288 | struct bt8xxgpio *bg = pci_get_drvdata(pdev); | |
289 | unsigned long flags; | |
290 | int err; | |
291 | ||
292 | pci_set_power_state(pdev, 0); | |
293 | err = pci_enable_device(pdev); | |
294 | if (err) | |
295 | return err; | |
296 | pci_restore_state(pdev); | |
297 | ||
298 | spin_lock_irqsave(&bg->lock, flags); | |
299 | ||
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, | |
305 | BT848_GPIO_DATA); | |
306 | ||
307 | spin_unlock_irqrestore(&bg->lock, flags); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | #else | |
312 | #define bt8xxgpio_suspend NULL | |
313 | #define bt8xxgpio_resume NULL | |
314 | #endif /* CONFIG_PM */ | |
315 | ||
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) }, | |
321 | { 0, }, | |
322 | }; | |
323 | MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl); | |
324 | ||
325 | static struct pci_driver bt8xxgpio_pci_driver = { | |
326 | .name = "bt8xxgpio", | |
327 | .id_table = bt8xxgpio_pci_tbl, | |
328 | .probe = bt8xxgpio_probe, | |
329 | .remove = bt8xxgpio_remove, | |
330 | .suspend = bt8xxgpio_suspend, | |
331 | .resume = bt8xxgpio_resume, | |
332 | }; | |
333 | ||
334 | static int bt8xxgpio_init(void) | |
335 | { | |
336 | return pci_register_driver(&bt8xxgpio_pci_driver); | |
337 | } | |
338 | module_init(bt8xxgpio_init) | |
339 | ||
340 | static void bt8xxgpio_exit(void) | |
341 | { | |
342 | pci_unregister_driver(&bt8xxgpio_pci_driver); | |
343 | } | |
344 | module_exit(bt8xxgpio_exit) | |
345 | ||
346 | MODULE_LICENSE("GPL"); | |
347 | MODULE_AUTHOR("Michael Buesch"); | |
348 | MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card"); |