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
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 = 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
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 = 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
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 = 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
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 = 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
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 = false;
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 = 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
bt8xxgpio_remove(struct pci_dev * pdev)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
bt8xxgpio_suspend(struct pci_dev * pdev,pm_message_t state)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
bt8xxgpio_resume(struct pci_dev * pdev)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
