summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-bt8xx.c
blob: c5c356b7f2cec8e9630cf5c5659c9e6ae3c4824c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/*

    bt8xx GPIO abuser

    Copyright (C) 2008 Michael Buesch <m@bues.ch>

    Please do _only_ contact the people listed _above_ with issues related to this driver.
    All the other people listed below are not related to this driver. Their names
    are only here, because this driver is derived from the bt848 driver.


    Derived from the bt848 driver:

    Copyright (C) 1996,97,98 Ralph  Metzler
			   & Marcus Metzler
    (c) 1999-2002 Gerd Knorr

    some v4l2 code lines are taken from Justin's bttv2 driver which is
    (c) 2000 Justin Schoeman

    V4L1 removal from:
    (c) 2005-2006 Nickolay V. Shmyrev

    Fixes to be fully V4L2 compliant by
    (c) 2006 Mauro Carvalho Chehab

    Cropping and overscan support
    Copyright (C) 2005, 2006 Michael H. Schimek
    Sponsored by OPQ Systems AB

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/gpio.h>
#include <linux/slab.h>

/* Steal the hardware definitions from the bttv driver. */
#include "../media/pci/bt8xx/bt848.h"


#define BT8XXGPIO_NR_GPIOS		24 /* We have 24 GPIO pins */


struct bt8xxgpio {
	spinlock_t lock;

	void __iomem *mmio;
	struct pci_dev *pdev;
	struct gpio_chip gpio;

#ifdef CONFIG_PM
	u32 saved_outen;
	u32 saved_data;
#endif
};

#define bgwrite(dat, adr)	writel((dat), bg->mmio+(adr))
#define bgread(adr)		readl(bg->mmio+(adr))


static int modparam_gpiobase = -1/* dynamic */;
module_param_named(gpiobase, modparam_gpiobase, int, 0444);
MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");


static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
	struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
	unsigned long flags;
	u32 outen, data;

	spin_lock_irqsave(&bg->lock, flags);

	data = bgread(BT848_GPIO_DATA);
	data &= ~(1 << nr);
	bgwrite(data, BT848_GPIO_DATA);

	outen = bgread(BT848_GPIO_OUT_EN);
	outen &= ~(1 << nr);
	bgwrite(outen, BT848_GPIO_OUT_EN);

	spin_unlock_irqrestore(&bg->lock, flags);

	return 0;
}

static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
	struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&bg->lock, flags);
	val = bgread(BT848_GPIO_DATA);
	spin_unlock_irqrestore(&bg->lock, flags);

	return !!(val & (1 << nr));
}

static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
					unsigned nr, int val)
{
	struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
	unsigned long flags;
	u32 outen, data;

	spin_lock_irqsave(&bg->lock, flags);

	outen = bgread(BT848_GPIO_OUT_EN);
	outen |= (1 << nr);
	bgwrite(outen, BT848_GPIO_OUT_EN);

	data = bgread(BT848_GPIO_DATA);
	if (val)
		data |= (1 << nr);
	else
		data &= ~(1 << nr);
	bgwrite(data, BT848_GPIO_DATA);

	spin_unlock_irqrestore(&bg->lock, flags);

	return 0;
}

static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
			    unsigned nr, int val)
{
	struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
	unsigned long flags;
	u32 data;

	spin_lock_irqsave(&bg->lock, flags);

	data = bgread(BT848_GPIO_DATA);
	if (val)
		data |= (1 << nr);
	else
		data &= ~(1 << nr);
	bgwrite(data, BT848_GPIO_DATA);

	spin_unlock_irqrestore(&bg->lock, flags);
}

static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
{
	struct gpio_chip *c = &bg->gpio;

	c->label = dev_name(&bg->pdev->dev);
	c->owner = THIS_MODULE;
	c->direction_input = bt8xxgpio_gpio_direction_input;
	c->get = bt8xxgpio_gpio_get;
	c->direction_output = bt8xxgpio_gpio_direction_output;
	c->set = bt8xxgpio_gpio_set;
	c->dbg_show = NULL;
	c->base = modparam_gpiobase;
	c->ngpio = BT8XXGPIO_NR_GPIOS;
	c->can_sleep = 0;
}

static int bt8xxgpio_probe(struct pci_dev *dev,
			const struct pci_device_id *pci_id)
{
	struct bt8xxgpio *bg;
	int err;

	bg = kzalloc(sizeof(*bg), GFP_KERNEL);
	if (!bg)
		return -ENOMEM;

	bg->pdev = dev;
	spin_lock_init(&bg->lock);

	err = pci_enable_device(dev);
	if (err) {
		printk(KERN_ERR "bt8xxgpio: Can't enable device.\n");
		goto err_freebg;
	}
	if (!request_mem_region(pci_resource_start(dev, 0),
				pci_resource_len(dev, 0),
				"bt8xxgpio")) {
		printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n",
		       (unsigned long long)pci_resource_start(dev, 0));
		err = -EBUSY;
		goto err_disable;
	}
	pci_set_master(dev);
	pci_set_drvdata(dev, bg);

	bg->mmio = ioremap(pci_resource_start(dev, 0), 0x1000);
	if (!bg->mmio) {
		printk(KERN_ERR "bt8xxgpio: ioremap() failed\n");
		err = -EIO;
		goto err_release_mem;
	}

	/* Disable interrupts */
	bgwrite(0, BT848_INT_MASK);

	/* gpio init */
	bgwrite(0, BT848_GPIO_DMA_CTL);
	bgwrite(0, BT848_GPIO_REG_INP);
	bgwrite(0, BT848_GPIO_OUT_EN);

	bt8xxgpio_gpio_setup(bg);
	err = gpiochip_add(&bg->gpio);
	if (err) {
		printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n");
		goto err_release_mem;
	}

	return 0;

err_release_mem:
	release_mem_region(pci_resource_start(dev, 0),
			   pci_resource_len(dev, 0));
err_disable:
	pci_disable_device(dev);
err_freebg:
	kfree(bg);

	return err;
}

static void bt8xxgpio_remove(struct pci_dev *pdev)
{
	struct bt8xxgpio *bg = pci_get_drvdata(pdev);

	gpiochip_remove(&bg->gpio);

	bgwrite(0, BT848_INT_MASK);
	bgwrite(~0x0, BT848_INT_STAT);
	bgwrite(0x0, BT848_GPIO_OUT_EN);

	iounmap(bg->mmio);
	release_mem_region(pci_resource_start(pdev, 0),
			   pci_resource_len(pdev, 0));
	pci_disable_device(pdev);

	kfree(bg);
}

#ifdef CONFIG_PM
static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
	unsigned long flags;

	spin_lock_irqsave(&bg->lock, flags);

	bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
	bg->saved_data = bgread(BT848_GPIO_DATA);

	bgwrite(0, BT848_INT_MASK);
	bgwrite(~0x0, BT848_INT_STAT);
	bgwrite(0x0, BT848_GPIO_OUT_EN);

	spin_unlock_irqrestore(&bg->lock, flags);

	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

static int bt8xxgpio_resume(struct pci_dev *pdev)
{
	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
	unsigned long flags;
	int err;

	pci_set_power_state(pdev, PCI_D0);
	err = pci_enable_device(pdev);
	if (err)
		return err;
	pci_restore_state(pdev);

	spin_lock_irqsave(&bg->lock, flags);

	bgwrite(0, BT848_INT_MASK);
	bgwrite(0, BT848_GPIO_DMA_CTL);
	bgwrite(0, BT848_GPIO_REG_INP);
	bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
	bgwrite(bg->saved_data & bg->saved_outen,
		BT848_GPIO_DATA);

	spin_unlock_irqrestore(&bg->lock, flags);

	return 0;
}
#else
#define bt8xxgpio_suspend NULL
#define bt8xxgpio_resume NULL
#endif /* CONFIG_PM */

static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);

static struct pci_driver bt8xxgpio_pci_driver = {
	.name		= "bt8xxgpio",
	.id_table	= bt8xxgpio_pci_tbl,
	.probe		= bt8xxgpio_probe,
	.remove		= bt8xxgpio_remove,
	.suspend	= bt8xxgpio_suspend,
	.resume		= bt8xxgpio_resume,
};

module_pci_driver(bt8xxgpio_pci_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Buesch");
MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");