summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/pxa27x_keyboard.c
blob: ebe5eacf299036c3b0c47ceac0f365c0a39bcec6 (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
/*
 * linux/drivers/input/keyboard/pxa27x_keyboard.c
 *
 * Driver for the pxa27x matrix keyboard controller.
 *
 * Created:	Feb 22, 2007
 * Author:	Rodolfo Giometti <giometti@linux.it>
 *
 * Based on a previous implementations by Kevin O'Connor
 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
 * on some suggestions by Nicolas Pitre <nico@cam.org>.
 *
 * 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/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/irqs.h>
#include <asm/arch/pxa27x_keyboard.h>

#define DRIVER_NAME		"pxa27x-keyboard"

#define KPASMKP(col)		(col/2 == 0 ? KPASMKP0 : \
				 col/2 == 1 ? KPASMKP1 : \
				 col/2 == 2 ? KPASMKP2 : KPASMKP3)
#define KPASMKPx_MKC(row, col)	(1 << (row + 16 * (col % 2)))

static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
	struct input_dev *input_dev = platform_get_drvdata(pdev);
	unsigned long kpc = KPC;
	int p, row, col, rel;

	if (kpc & KPC_DI) {
		unsigned long kpdk = KPDK;

		if (!(kpdk & KPDK_DKP)) {
			/* better luck next time */
		} else if (kpc & KPC_REE0) {
			unsigned long kprec = KPREC;
			KPREC = 0x7f;

			if (kprec & KPREC_OF0)
				rel = (kprec & 0xff) + 0x7f;
			else if (kprec & KPREC_UF0)
				rel = (kprec & 0xff) - 0x7f - 0xff;
			else
				rel = (kprec & 0xff) - 0x7f;

			if (rel) {
				input_report_rel(input_dev, REL_WHEEL, rel);
				input_sync(input_dev);
			}
		}
	}

	if (kpc & KPC_MI) {
		/* report the status of every button */
		for (row = 0; row < pdata->nr_rows; row++) {
			for (col = 0; col < pdata->nr_cols; col++) {
				p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
					1 : 0;
				pr_debug("keycode %x - pressed %x\n",
						pdata->keycodes[row][col], p);
				input_report_key(input_dev,
						pdata->keycodes[row][col], p);
			}
		}
		input_sync(input_dev);
	}

	return IRQ_HANDLED;
}

static int pxakbd_open(struct input_dev *dev)
{
	/* Set keypad control register */
	KPC |= (KPC_ASACT |
		KPC_MS_ALL |
		(2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
		KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);

	KPC &= ~KPC_AS;         /* disable automatic scan */
	KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */

	/* Set rotary count to mid-point value */
	KPREC = 0x7F;

	/* Enable unit clock */
	pxa_set_cken(CKEN_KEYPAD, 1);

	return 0;
}

static void pxakbd_close(struct input_dev *dev)
{
	/* Disable clock unit */
	pxa_set_cken(CKEN_KEYPAD, 0);
}

#ifdef CONFIG_PM
static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;

	/* Save controller status */
	pdata->reg_kpc = KPC;
	pdata->reg_kprec = KPREC;

	return 0;
}

static int pxakbd_resume(struct platform_device *pdev)
{
	struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
	struct input_dev *input_dev = platform_get_drvdata(pdev);

	mutex_lock(&input_dev->mutex);

	if (input_dev->users) {
		/* Restore controller status */
		KPC = pdata->reg_kpc;
		KPREC = pdata->reg_kprec;

		/* Enable unit clock */
		pxa_set_cken(CKEN_KEYPAD, 1);
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
}
#else
#define pxakbd_suspend	NULL
#define pxakbd_resume	NULL
#endif

static int __devinit pxakbd_probe(struct platform_device *pdev)
{
	struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
	struct input_dev *input_dev;
	int i, row, col, error;

	/* Create and register the input driver. */
	input_dev = input_allocate_device();
	if (!input_dev) {
		printk(KERN_ERR "Cannot request keypad device\n");
		return -ENOMEM;
	}

	input_dev->name = DRIVER_NAME;
	input_dev->id.bustype = BUS_HOST;
	input_dev->open = pxakbd_open;
	input_dev->close = pxakbd_close;
	input_dev->dev.parent = &pdev->dev;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
	input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
	for (row = 0; row < pdata->nr_rows; row++) {
		for (col = 0; col < pdata->nr_cols; col++) {
			int code = pdata->keycodes[row][col];
			if (code > 0)
				set_bit(code, input_dev->keybit);
		}
	}

	error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
			    DRIVER_NAME, pdev);
	if (error) {
		printk(KERN_ERR "Cannot request keypad IRQ\n");
		pxa_set_cken(CKEN_KEYPAD, 0);
		goto err_free_dev;
	}

	platform_set_drvdata(pdev, input_dev);

	/* Register the input device */
	error = input_register_device(input_dev);
	if (error)
		goto err_free_irq;

	/* Setup GPIOs. */
	for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
		pxa_gpio_mode(pdata->gpio_modes[i]);

	/*
	 * Store rows/cols info into keyboard registers.
	 */

	KPC |= (pdata->nr_rows - 1) << 26;
	KPC |= (pdata->nr_cols - 1) << 23;

	for (col = 0; col < pdata->nr_cols; col++)
		KPC |= KPC_MS0 << col;

	return 0;

 err_free_irq:
	platform_set_drvdata(pdev, NULL);
	free_irq(IRQ_KEYPAD, pdev);
 err_free_dev:
	input_free_device(input_dev);
	return error;
}

static int __devexit pxakbd_remove(struct platform_device *pdev)
{
	struct input_dev *input_dev = platform_get_drvdata(pdev);

	input_unregister_device(input_dev);
	free_irq(IRQ_KEYPAD, pdev);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver pxakbd_driver = {
	.probe		= pxakbd_probe,
	.remove		= __devexit_p(pxakbd_remove),
	.suspend	= pxakbd_suspend,
	.resume		= pxakbd_resume,
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

static int __init pxakbd_init(void)
{
	return platform_driver_register(&pxakbd_driver);
}

static void __exit pxakbd_exit(void)
{
	platform_driver_unregister(&pxakbd_driver);
}

module_init(pxakbd_init);
module_exit(pxakbd_exit);

MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
MODULE_LICENSE("GPL");