summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/sh_keysc.c
blob: 8e9380bfed4097fcdc283cfc7c3532ed0e911318 (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
/*
 * SuperH KEYSC Keypad Driver
 *
 * Copyright (C) 2008 Magnus Damm
 *
 * Based on gpio_keys.c, Copyright 2005 Phil Blundell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/input/sh_keysc.h>
#include <linux/clk.h>
#include <linux/io.h>

#define KYCR1_OFFS   0x00
#define KYCR2_OFFS   0x04
#define KYINDR_OFFS  0x08
#define KYOUTDR_OFFS 0x0c

#define KYCR2_IRQ_LEVEL    0x10
#define KYCR2_IRQ_DISABLED 0x00

static const struct {
	unsigned char kymd, keyout, keyin;
} sh_keysc_mode[] = {
	[SH_KEYSC_MODE_1] = { 0, 6, 5 },
	[SH_KEYSC_MODE_2] = { 1, 5, 6 },
	[SH_KEYSC_MODE_3] = { 2, 4, 7 },
};

struct sh_keysc_priv {
	void __iomem *iomem_base;
	struct clk *clk;
	unsigned long last_keys;
	struct input_dev *input;
	struct sh_keysc_info pdata;
};

static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
	struct sh_keysc_info *pdata = &priv->pdata;
	unsigned long keys, keys1, keys0, mask;
	unsigned char keyin_set, tmp;
	int i, k;

	dev_dbg(&pdev->dev, "isr!\n");

	keys1 = ~0;
	keys0 = 0;

	do {
		keys = 0;
		keyin_set = 0;

		iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

		for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
			iowrite16(0xfff ^ (3 << (i * 2)),
				  priv->iomem_base + KYOUTDR_OFFS);
			udelay(pdata->delay);
			tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
			keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
			tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
			keyin_set |= tmp;
		}

		iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
		iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
			  priv->iomem_base + KYCR2_OFFS);

		if (pdata->kycr2_delay)
			udelay(pdata->kycr2_delay);

		keys ^= ~0;
		keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
			       sh_keysc_mode[pdata->mode].keyout)) - 1;
		keys1 &= keys;
		keys0 |= keys;

		dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);

	} while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);

	dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
		priv->last_keys, keys0, keys1);

	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
		k = pdata->keycodes[i];
		if (!k)
			continue;

		mask = 1 << i;

		if (!((priv->last_keys ^ keys0) & mask))
			continue;

		if ((keys1 | keys0) & mask) {
			input_event(priv->input, EV_KEY, k, 1);
			priv->last_keys |= mask;
		}

		if (!(keys1 & mask)) {
			input_event(priv->input, EV_KEY, k, 0);
			priv->last_keys &= ~mask;
		}

	}
	input_sync(priv->input);

	return IRQ_HANDLED;
}

#define res_size(res) ((res)->end - (res)->start + 1)

static int __devinit sh_keysc_probe(struct platform_device *pdev)
{
	struct sh_keysc_priv *priv;
	struct sh_keysc_info *pdata;
	struct resource *res;
	struct input_dev *input;
	char clk_name[8];
	int i;
	int irq, error;

	if (!pdev->dev.platform_data) {
		dev_err(&pdev->dev, "no platform data defined\n");
		error = -EINVAL;
		goto err0;
	}

	error = -ENXIO;
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to get I/O memory\n");
		goto err0;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get irq\n");
		goto err0;
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (priv == NULL) {
		dev_err(&pdev->dev, "failed to allocate driver data\n");
		error = -ENOMEM;
		goto err0;
	}

	platform_set_drvdata(pdev, priv);
	memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
	pdata = &priv->pdata;

	priv->iomem_base = ioremap_nocache(res->start, res_size(res));
	if (priv->iomem_base == NULL) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		error = -ENXIO;
		goto err1;
	}

	snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
	priv->clk = clk_get(&pdev->dev, clk_name);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
		error = PTR_ERR(priv->clk);
		goto err2;
	}

	priv->input = input_allocate_device();
	if (!priv->input) {
		dev_err(&pdev->dev, "failed to allocate input device\n");
		error = -ENOMEM;
		goto err3;
	}

	input = priv->input;
	input->evbit[0] = BIT_MASK(EV_KEY);

	input->name = pdev->name;
	input->phys = "sh-keysc-keys/input0";
	input->dev.parent = &pdev->dev;

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	input->keycode = pdata->keycodes;
	input->keycodesize = sizeof(pdata->keycodes[0]);
	input->keycodemax = ARRAY_SIZE(pdata->keycodes);

	error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
	if (error) {
		dev_err(&pdev->dev, "failed to request IRQ\n");
		goto err4;
	}

	for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
		__set_bit(pdata->keycodes[i], input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev, "failed to register input device\n");
		goto err5;
	}

	clk_enable(priv->clk);

	iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) |
		  pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
	iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
	iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);

	device_init_wakeup(&pdev->dev, 1);

	return 0;

 err5:
	free_irq(irq, pdev);
 err4:
	input_free_device(input);
 err3:
	clk_put(priv->clk);
 err2:
	iounmap(priv->iomem_base);
 err1:
	platform_set_drvdata(pdev, NULL);
	kfree(priv);
 err0:
	return error;
}

static int __devexit sh_keysc_remove(struct platform_device *pdev)
{
	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);

	iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

	input_unregister_device(priv->input);
	free_irq(platform_get_irq(pdev, 0), pdev);
	iounmap(priv->iomem_base);

	clk_disable(priv->clk);
	clk_put(priv->clk);

	platform_set_drvdata(pdev, NULL);
	kfree(priv);

	return 0;
}

static int sh_keysc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);
	unsigned short value;

	value = ioread16(priv->iomem_base + KYCR1_OFFS);

	if (device_may_wakeup(dev)) {
		value |= 0x80;
		enable_irq_wake(irq);
	} else {
		value &= ~0x80;
	}

	iowrite16(value, priv->iomem_base + KYCR1_OFFS);

	return 0;
}

static int sh_keysc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	int irq = platform_get_irq(pdev, 0);

	if (device_may_wakeup(dev))
		disable_irq_wake(irq);

	return 0;
}

static const struct dev_pm_ops sh_keysc_dev_pm_ops = {
	.suspend = sh_keysc_suspend,
	.resume = sh_keysc_resume,
};

struct platform_driver sh_keysc_device_driver = {
	.probe		= sh_keysc_probe,
	.remove		= __devexit_p(sh_keysc_remove),
	.driver		= {
		.name	= "sh_keysc",
		.pm	= &sh_keysc_dev_pm_ops,
	}
};

static int __init sh_keysc_init(void)
{
	return platform_driver_register(&sh_keysc_device_driver);
}

static void __exit sh_keysc_exit(void)
{
	platform_driver_unregister(&sh_keysc_device_driver);
}

module_init(sh_keysc_init);
module_exit(sh_keysc_exit);

MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
MODULE_LICENSE("GPL");