aboutsummaryrefslogtreecommitdiffstats
path: root/package/kernel/leds-apu2/src/leds-apu2.c
blob: 2fefa857cb7b629230ad64276560fb7194e9c2da (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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/*
*  APU2 LED/GPIO Driver
*  Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
*
*  Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
*
*  Copyright (c) 2015  Carsten Spiess <fli4l at carsten-spiess.de>
*
*  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/types.h>
#include <linux/miscdevice.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/version.h>
#include <linux/dmi.h>
#include <linux/string.h>

#include <linux/leds.h>
#include <linux/input.h>
#include <linux/gpio_keys.h>

#define DEVNAME                 "leds-apu2"

#define FCH_ACPI_MMIO_BASE      0xFED80000
#define FCH_GPIO_BASE           (FCH_ACPI_MMIO_BASE + 0x1500)
#define FCH_GPIO_SIZE           0x300

#define APU_NUM_GPIO            4

#define GPIO_BIT_DIR            23
#define GPIO_BIT_WRITE          22
#define GPIO_BIT_READ           16

/* internal variables */
static struct pci_dev *gpio_apu2_pci;
static DEFINE_SPINLOCK (gpio_lock);

/* the watchdog platform device */
static struct platform_device *gpio_apu2_platform_device;
static struct platform_device *leddev;
static struct platform_device *keydev;

static const struct pci_device_id gpio_apu2_pci_tbl[] ={
	{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, PCI_ANY_ID},
	{ 0, } /* End of list */
};
MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);

/* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};

static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};

static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
{
	u32 val;

	val = ~ioread32 (gpio_addr[offset]);

	return (val >> GPIO_BIT_DIR) & 1;
}

static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
{
	u32 val;

	spin_lock_bh (&gpio_lock);

	val = ioread32 (gpio_addr[offset]);
	val &= ~BIT(GPIO_BIT_DIR);
	iowrite32 (val, gpio_addr[offset]);

	spin_unlock_bh (&gpio_lock);

	return 0;
}

static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
		int value)
{
	u32 val;

	spin_lock_bh (&gpio_lock);

	val = ioread32 (gpio_addr[offset]);
	val |= BIT(GPIO_BIT_DIR);
	iowrite32 (val, gpio_addr[offset]);

	spin_unlock_bh (&gpio_lock);

	return 0;
}

static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
{
	u32 val;

	val = ioread32 (gpio_addr[offset]);

	return (val >> GPIO_BIT_READ) & 1;
}

static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value)
{
	u32 val;

	spin_lock_bh (&gpio_lock);

	val = ioread32 (gpio_addr[offset]);

	if (value)
		val |= BIT(GPIO_BIT_WRITE);
	else
		val &= ~BIT(GPIO_BIT_WRITE);

	iowrite32 (val, gpio_addr[offset]);

	spin_unlock_bh (&gpio_lock);
}

static struct gpio_chip gpio_apu2_chip = {
	.label = DEVNAME,
	.owner = THIS_MODULE,
	.base = -1,
	.ngpio = APU_NUM_GPIO,
	.get_direction = gpio_apu2_get_dir,
	.direction_input = gpio_apu2_dir_in,
	.direction_output = gpio_apu2_dir_out,
	.get = gpio_apu2_get_data,
	.set = gpio_apu2_set_data,
};

/*
 *
 */
static int gpio_apu2_probe (struct platform_device *dev)
{
	int ret = 0;
	int i;
	struct pci_dev *pci_dev = NULL;

	/* Match the PCI device */
	for_each_pci_dev (pci_dev) {
		if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) {
			gpio_apu2_pci = pci_dev;
			break;
		}
	}

	if (!gpio_apu2_pci)
		return -ENODEV;

	pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision);

	/* Determine type of southbridge chipset */
	if (gpio_apu2_pci->revision < 0x40) {
		return -EACCES;
	}

	/* Request memory region for GPIO's */
	if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE,
		FCH_GPIO_SIZE, DEVNAME)){
		pr_err ("%s: request GPIO mem region failed\n", DEVNAME);
		return -ENXIO;
	}

	/* Map IO's for GPIO's */
	for (i = 0; i < APU_NUM_GPIO; i++) {
		gpio_addr[i] = devm_ioremap (&dev->dev,
			FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof (u32));
		if (!gpio_addr[i]) {
			pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]);
			return -ENXIO;
		}
	}

#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
	gpio_apu2_chip.dev = &dev->dev;
#else
	gpio_apu2_chip.parent = &dev->dev;
#endif
	ret = gpiochip_add (&gpio_apu2_chip);
	if (ret) {
		pr_err ("%s: adding gpiochip failed\n", DEVNAME);
	}

	return ret;
}

static int gpio_apu2_remove (struct platform_device *dev)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
	int ret;
	ret = gpiochip_remove (&gpio_apu2_chip);
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
	gpiochip_remove (&gpio_apu2_chip);
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
	return 0;
}

static struct platform_driver gpio_apu2_driver = {
	.probe = gpio_apu2_probe,
	.remove = gpio_apu2_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = DEVNAME
	}
};

static struct gpio_led apu2_leds_gpio[] = {
	{
		.name           = "apu2:green:power",
		.gpio           = 509,
		.active_low     = 1,
	},
	{
		.name           = "apu2:green:led2",
		.gpio           = 510,
		.active_low     = 1,
	},
	{
		.name           = "apu2:green:led3",
		.gpio           = 511,
		.active_low     = 1,
	},
};

static struct gpio_keys_button apu2_gpio_keys[] = {
	{
		.desc           = "Reset button",
		.type           = EV_KEY,
		.code           = KEY_RESTART,
		.debounce_interval = 60,
		.gpio           = 508,
		.active_low     = 1,
	},
};

static void register_gpio_keys_polled(int id, unsigned poll_interval,
				      unsigned nbuttons,
				      struct gpio_keys_button *buttons)
{
	struct gpio_keys_platform_data pdata = { };
	int err;

	keydev = platform_device_alloc("gpio-keys-polled", id);
	if (!keydev) {
		printk(KERN_ERR "Failed to allocate gpio-keys platform device\n");
		return;
	}

	pdata.poll_interval = poll_interval;
	pdata.nbuttons = nbuttons;
	pdata.buttons = buttons;

	err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
	if (err) {
		dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err);
		goto err_put_pdev;
	}

	err = platform_device_add(keydev);
	if (err) {
		dev_err(&keydev->dev, "failed to register key platform device (%d)", err);
		goto err_put_pdev;
	}

	return;

err_put_pdev:
	platform_device_put(keydev);
	keydev = NULL;
}

static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds)
{
	struct gpio_led_platform_data pdata = { };
	int err;

	leddev = platform_device_alloc("leds-gpio", id);
	if (!leddev) {
		printk(KERN_ERR "Failed to allocate leds-gpio platform device\n");
		return;
	}

	pdata.num_leds = num_leds;
	pdata.leds = leds;

	err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
	if (err) {
		dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err);
		goto err_put_pdev;
	}

	err = platform_device_add(leddev);
	if (err) {
		dev_err(&leddev->dev, "failed to register key platform device (%d)", err);
		goto err_put_pdev;
	}

	return;

err_put_pdev:
	platform_device_put(leddev);
	leddev = NULL;
}

static int __init gpio_apu2_init (void)
{
	int err;
	const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
	const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);

	/* Match the device name/model */
	if (!board_name \
			|| !board_vendor \
			|| strcasecmp(board_vendor, "PC Engines") \
			|| (strcasecmp(board_name, "apu2") \
				&& strcasecmp(board_name, "apu3") \
				&& strcasecmp(board_name, "PC Engines apu2") \
				&& strcasecmp(board_name, "PC Engines apu3"))) {
		err = -ENODEV;
		goto exit;
	}

	pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);

	err = platform_driver_register (&gpio_apu2_driver);
	if (err)
		goto exit;

	gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0);
	if (IS_ERR(gpio_apu2_platform_device)) {
		err = PTR_ERR(gpio_apu2_platform_device);
		goto exit_driver;
	}

	pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);

	register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
	register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys);
	return 0;

exit_driver:
	platform_driver_unregister (&gpio_apu2_driver);
exit:
	return err;
}

static void __exit gpio_apu2_exit (void)
{
	platform_device_unregister (gpio_apu2_platform_device);
	platform_device_unregister (leddev);
	platform_device_unregister (keydev);
	platform_driver_unregister (&gpio_apu2_driver);
	pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
}

MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
MODULE_LICENSE("GPL");

module_init (gpio_apu2_init);
module_exit (gpio_apu2_exit);