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/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
bt8xxgpio_gpio_direction_input(struct gpio_chip * gpio,unsigned nr)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
bt8xxgpio_gpio_get(struct gpio_chip * gpio,unsigned nr)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
bt8xxgpio_gpio_direction_output(struct gpio_chip * gpio,unsigned nr,int val)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
bt8xxgpio_gpio_set(struct gpio_chip * gpio,unsigned nr,int val)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
bt8xxgpio_gpio_setup(struct bt8xxgpio * bg)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 = 0;
173 }
174
bt8xxgpio_probe(struct pci_dev * dev,const struct pci_device_id * pci_id)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 return 0;
227
228 err_release_mem:
229 release_mem_region(pci_resource_start(dev, 0),
230 pci_resource_len(dev, 0));
231 pci_set_drvdata(dev, NULL);
232 err_disable:
233 pci_disable_device(dev);
234 err_freebg:
235 kfree(bg);
236
237 return err;
238 }
239
bt8xxgpio_remove(struct pci_dev * pdev)240 static void bt8xxgpio_remove(struct pci_dev *pdev)
241 {
242 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
243
244 gpiochip_remove(&bg->gpio);
245
246 bgwrite(0, BT848_INT_MASK);
247 bgwrite(~0x0, BT848_INT_STAT);
248 bgwrite(0x0, BT848_GPIO_OUT_EN);
249
250 iounmap(bg->mmio);
251 release_mem_region(pci_resource_start(pdev, 0),
252 pci_resource_len(pdev, 0));
253 pci_disable_device(pdev);
254
255 pci_set_drvdata(pdev, NULL);
256 kfree(bg);
257 }
258
259 #ifdef CONFIG_PM
bt8xxgpio_suspend(struct pci_dev * pdev,pm_message_t state)260 static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
261 {
262 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
263 unsigned long flags;
264
265 spin_lock_irqsave(&bg->lock, flags);
266
267 bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
268 bg->saved_data = bgread(BT848_GPIO_DATA);
269
270 bgwrite(0, BT848_INT_MASK);
271 bgwrite(~0x0, BT848_INT_STAT);
272 bgwrite(0x0, BT848_GPIO_OUT_EN);
273
274 spin_unlock_irqrestore(&bg->lock, flags);
275
276 pci_save_state(pdev);
277 pci_disable_device(pdev);
278 pci_set_power_state(pdev, pci_choose_state(pdev, state));
279
280 return 0;
281 }
282
bt8xxgpio_resume(struct pci_dev * pdev)283 static int bt8xxgpio_resume(struct pci_dev *pdev)
284 {
285 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
286 unsigned long flags;
287 int err;
288
289 pci_set_power_state(pdev, 0);
290 err = pci_enable_device(pdev);
291 if (err)
292 return err;
293 pci_restore_state(pdev);
294
295 spin_lock_irqsave(&bg->lock, flags);
296
297 bgwrite(0, BT848_INT_MASK);
298 bgwrite(0, BT848_GPIO_DMA_CTL);
299 bgwrite(0, BT848_GPIO_REG_INP);
300 bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
301 bgwrite(bg->saved_data & bg->saved_outen,
302 BT848_GPIO_DATA);
303
304 spin_unlock_irqrestore(&bg->lock, flags);
305
306 return 0;
307 }
308 #else
309 #define bt8xxgpio_suspend NULL
310 #define bt8xxgpio_resume NULL
311 #endif /* CONFIG_PM */
312
313 static struct pci_device_id bt8xxgpio_pci_tbl[] = {
314 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
315 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
316 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
317 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
318 { 0, },
319 };
320 MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
321
322 static struct pci_driver bt8xxgpio_pci_driver = {
323 .name = "bt8xxgpio",
324 .id_table = bt8xxgpio_pci_tbl,
325 .probe = bt8xxgpio_probe,
326 .remove = bt8xxgpio_remove,
327 .suspend = bt8xxgpio_suspend,
328 .resume = bt8xxgpio_resume,
329 };
330
bt8xxgpio_init(void)331 static int __init bt8xxgpio_init(void)
332 {
333 return pci_register_driver(&bt8xxgpio_pci_driver);
334 }
module_init(bt8xxgpio_init)335 module_init(bt8xxgpio_init)
336
337 static void __exit bt8xxgpio_exit(void)
338 {
339 pci_unregister_driver(&bt8xxgpio_pci_driver);
340 }
341 module_exit(bt8xxgpio_exit)
342
343 MODULE_LICENSE("GPL");
344 MODULE_AUTHOR("Michael Buesch");
345 MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");
346