aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mfd/ucb1400_core.c
blob: fa294b6d600a9d6af6f8f27d8b853b5aea7d55e3 (plain) (blame)
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
/*
 * Core functions for:
 *  Philips UCB1400 multifunction chip
 *
 * Based on ucb1400_ts.c:
 *  Author:	Nicolas Pitre
 *  Created:	September 25, 2006
 *  Copyright:	MontaVista Software, Inc.
 *
 * Spliting done by: Marek Vasut <marek.vasut@gmail.com>
 * If something doesnt work and it worked before spliting, e-mail me,
 * dont bother Nicolas please ;-)
 *
 * 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.
 *
 * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
 * covering the UCB1100, UCB1200 and UCB1300..  Support for the UCB1400 has
 * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ucb1400.h>

unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
		int adcsync)
{
	unsigned int val;

	if (adcsync)
		adc_channel |= UCB_ADC_SYNC_ENA;

	ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
	ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
			UCB_ADC_START);

	while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
				& UCB_ADC_DAT_VALID))
		schedule_timeout_uninterruptible(1);

	return val & UCB_ADC_DAT_MASK;
}
EXPORT_SYMBOL_GPL(ucb1400_adc_read);

static int ucb1400_core_probe(struct device *dev)
{
	int err;
	struct ucb1400 *ucb;
	struct ucb1400_ts ucb_ts;
	struct ucb1400_gpio ucb_gpio;
	struct snd_ac97 *ac97;

	memset(&ucb_ts, 0, sizeof(ucb_ts));
	memset(&ucb_gpio, 0, sizeof(ucb_gpio));

	ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
	if (!ucb) {
		err = -ENOMEM;
		goto err;
	}

	dev_set_drvdata(dev, ucb);

	ac97 = to_ac97_t(dev);

	ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
	if (ucb_ts.id != UCB_ID_1400) {
		err = -ENODEV;
		goto err0;
	}

	/* GPIO */
	ucb_gpio.ac97 = ac97;
	ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
	if (!ucb->ucb1400_gpio) {
		err = -ENOMEM;
		goto err0;
	}
	err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
					sizeof(ucb_gpio));
	if (err)
		goto err1;
	err = platform_device_add(ucb->ucb1400_gpio);
	if (err)
		goto err1;

	/* TOUCHSCREEN */
	ucb_ts.ac97 = ac97;
	ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
	if (!ucb->ucb1400_ts) {
		err = -ENOMEM;
		goto err2;
	}
	err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
					sizeof(ucb_ts));
	if (err)
		goto err3;
	err = platform_device_add(ucb->ucb1400_ts);
	if (err)
		goto err3;

	return 0;

err3:
	platform_device_put(ucb->ucb1400_ts);
err2:
	platform_device_unregister(ucb->ucb1400_gpio);
err1:
	platform_device_put(ucb->ucb1400_gpio);
err0:
	kfree(ucb);
err:
	return err;
}

static int ucb1400_core_remove(struct device *dev)
{
	struct ucb1400 *ucb = dev_get_drvdata(dev);

	platform_device_unregister(ucb->ucb1400_ts);
	platform_device_unregister(ucb->ucb1400_gpio);

	kfree(ucb);
	return 0;
}

static struct device_driver ucb1400_core_driver = {
	.name	= "ucb1400_core",
	.bus	= &ac97_bus_type,
	.probe	= ucb1400_core_probe,
	.remove	= ucb1400_core_remove,
};

static int __init ucb1400_core_init(void)
{
	return driver_register(&ucb1400_core_driver);
}

static void __exit ucb1400_core_exit(void)
{
	driver_unregister(&ucb1400_core_driver);
}

module_init(ucb1400_core_init);
module_exit(ucb1400_core_exit);

MODULE_DESCRIPTION("Philips UCB1400 driver");
MODULE_LICENSE("GPL");