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Michael Bueschff1d5c22008-07-25 01:46:10 -07001/*
2
3 bt8xx GPIO abuser
4
Michael Büscheb032b92011-07-04 20:50:05 +02005 Copyright (C) 2008 Michael Buesch <m@bues.ch>
Michael Bueschff1d5c22008-07-25 01:46:10 -07006
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>
H Hartley Sweetend120c172009-09-22 16:46:37 -070049#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090050#include <linux/slab.h>
Michael Bueschff1d5c22008-07-25 01:46:10 -070051
52/* Steal the hardware definitions from the bttv driver. */
Axel Lin52d32252012-08-21 17:37:13 +080053#include "../media/pci/bt8xx/bt848.h"
Michael Bueschff1d5c22008-07-25 01:46:10 -070054
55
56#define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */
57
58
59struct 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
76static int modparam_gpiobase = -1/* dynamic */;
77module_param_named(gpiobase, modparam_gpiobase, int, 0444);
78MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
79
80
81static 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
102static 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
115static 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
140static 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
159static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
160{
161 struct gpio_chip *c = &bg->gpio;
162
Kay Sievers3e274bd2009-03-24 16:38:23 -0700163 c->label = dev_name(&bg->pdev->dev);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700164 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;
Linus Walleij9fb1f392013-12-04 14:42:46 +0100172 c->can_sleep = false;
Michael Bueschff1d5c22008-07-25 01:46:10 -0700173}
174
175static int bt8xxgpio_probe(struct pci_dev *dev,
176 const struct pci_device_id *pci_id)
177{
178 struct bt8xxgpio *bg;
179 int err;
180
abdoulaye berthea435e182014-05-12 17:40:42 +0200181 bg = devm_kzalloc(&dev->dev, sizeof(struct bt8xxgpio), GFP_KERNEL);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700182 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");
abdoulaye berthea435e182014-05-12 17:40:42 +0200191 return err;
Michael Bueschff1d5c22008-07-25 01:46:10 -0700192 }
abdoulaye berthea435e182014-05-12 17:40:42 +0200193 if (!devm_request_mem_region(&dev->dev, pci_resource_start(dev, 0),
Michael Bueschff1d5c22008-07-25 01:46:10 -0700194 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
abdoulaye berthea435e182014-05-12 17:40:42 +0200204 bg->mmio = devm_ioremap(&dev->dev, pci_resource_start(dev, 0), 0x1000);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700205 if (!bg->mmio) {
206 printk(KERN_ERR "bt8xxgpio: ioremap() failed\n");
207 err = -EIO;
abdoulaye berthea435e182014-05-12 17:40:42 +0200208 goto err_disable;
Michael Bueschff1d5c22008-07-25 01:46:10 -0700209 }
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");
abdoulaye berthea435e182014-05-12 17:40:42 +0200223 goto err_disable;
Michael Bueschff1d5c22008-07-25 01:46:10 -0700224 }
225
Michael Bueschff1d5c22008-07-25 01:46:10 -0700226 return 0;
227
Michael Bueschff1d5c22008-07-25 01:46:10 -0700228err_disable:
229 pci_disable_device(dev);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700230
231 return err;
232}
233
234static 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 iounmap(bg->mmio);
245 release_mem_region(pci_resource_start(pdev, 0),
246 pci_resource_len(pdev, 0));
247 pci_disable_device(pdev);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700248}
249
250#ifdef CONFIG_PM
251static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
252{
253 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
254 unsigned long flags;
255
256 spin_lock_irqsave(&bg->lock, flags);
257
258 bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
259 bg->saved_data = bgread(BT848_GPIO_DATA);
260
261 bgwrite(0, BT848_INT_MASK);
262 bgwrite(~0x0, BT848_INT_STAT);
263 bgwrite(0x0, BT848_GPIO_OUT_EN);
264
265 spin_unlock_irqrestore(&bg->lock, flags);
266
267 pci_save_state(pdev);
268 pci_disable_device(pdev);
269 pci_set_power_state(pdev, pci_choose_state(pdev, state));
270
271 return 0;
272}
273
274static int bt8xxgpio_resume(struct pci_dev *pdev)
275{
276 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
277 unsigned long flags;
278 int err;
279
Yijing Wang038f0ba2013-06-27 20:58:55 +0800280 pci_set_power_state(pdev, PCI_D0);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700281 err = pci_enable_device(pdev);
282 if (err)
283 return err;
284 pci_restore_state(pdev);
285
286 spin_lock_irqsave(&bg->lock, flags);
287
288 bgwrite(0, BT848_INT_MASK);
289 bgwrite(0, BT848_GPIO_DMA_CTL);
290 bgwrite(0, BT848_GPIO_REG_INP);
291 bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
292 bgwrite(bg->saved_data & bg->saved_outen,
293 BT848_GPIO_DATA);
294
295 spin_unlock_irqrestore(&bg->lock, flags);
296
297 return 0;
298}
299#else
300#define bt8xxgpio_suspend NULL
301#define bt8xxgpio_resume NULL
302#endif /* CONFIG_PM */
303
Jingoo Han14f4a882013-12-03 08:08:45 +0900304static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
Michael Bueschff1d5c22008-07-25 01:46:10 -0700305 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
306 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
307 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
308 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
309 { 0, },
310};
311MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
312
313static struct pci_driver bt8xxgpio_pci_driver = {
314 .name = "bt8xxgpio",
315 .id_table = bt8xxgpio_pci_tbl,
316 .probe = bt8xxgpio_probe,
317 .remove = bt8xxgpio_remove,
318 .suspend = bt8xxgpio_suspend,
319 .resume = bt8xxgpio_resume,
320};
321
Axel Lin93baa652012-04-06 20:13:30 +0800322module_pci_driver(bt8xxgpio_pci_driver);
Michael Bueschff1d5c22008-07-25 01:46:10 -0700323
324MODULE_LICENSE("GPL");
325MODULE_AUTHOR("Michael Buesch");
326MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");