tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Core functions for:
4 * Philips UCB1400 multifunction chip
5 *
6 * Based on ucb1400_ts.c:
7 * Author: Nicolas Pitre
8 * Created: September 25, 2006
9 * Copyright: MontaVista Software, Inc.
10 *
11 * Spliting done by: Marek Vasut <marek.vasut@gmail.com>
12 * If something doesn't work and it worked before spliting, e-mail me,
13 * dont bother Nicolas please ;-)
14 *
15 * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
16 * covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
17 * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
18 */
19
20#include <linux/module.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/ucb1400.h>
24
25unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
26 int adcsync)
27{
28 unsigned int val;
29
30 if (adcsync)
31 adc_channel |= UCB_ADC_SYNC_ENA;
32
33 ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
34 ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
35 UCB_ADC_START);
36
37 while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
38 & UCB_ADC_DAT_VALID))
39 schedule_timeout_uninterruptible(1);
40
41 return val & UCB_ADC_DAT_MASK;
42}
43EXPORT_SYMBOL_GPL(ucb1400_adc_read);
44
45static int ucb1400_core_probe(struct device *dev)
46{
47 int err;
48 struct ucb1400 *ucb;
49 struct ucb1400_ts ucb_ts;
50 struct ucb1400_gpio ucb_gpio;
51 struct snd_ac97 *ac97;
52 struct ucb1400_pdata *pdata = dev_get_platdata(dev);
53
54 memset(&ucb_ts, 0, sizeof(ucb_ts));
55 memset(&ucb_gpio, 0, sizeof(ucb_gpio));
56
57 ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
58 if (!ucb) {
59 err = -ENOMEM;
60 goto err;
61 }
62
63 dev_set_drvdata(dev, ucb);
64
65 ac97 = to_ac97_t(dev);
66
67 ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
68 if (ucb_ts.id != UCB_ID_1400) {
69 err = -ENODEV;
70 goto err0;
71 }
72
73 /* GPIO */
74 ucb_gpio.ac97 = ac97;
75 if (pdata)
76 ucb_gpio.gpio_offset = pdata->gpio_offset;
77
78 ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
79 if (!ucb->ucb1400_gpio) {
80 err = -ENOMEM;
81 goto err0;
82 }
83 err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
84 sizeof(ucb_gpio));
85 if (err)
86 goto err1;
87 err = platform_device_add(ucb->ucb1400_gpio);
88 if (err)
89 goto err1;
90
91 /* TOUCHSCREEN */
92 ucb_ts.ac97 = ac97;
93
94 if (pdata != NULL && pdata->irq >= 0)
95 ucb_ts.irq = pdata->irq;
96 else
97 ucb_ts.irq = -1;
98
99 ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
100 if (!ucb->ucb1400_ts) {
101 err = -ENOMEM;
102 goto err2;
103 }
104 err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
105 sizeof(ucb_ts));
106 if (err)
107 goto err3;
108 err = platform_device_add(ucb->ucb1400_ts);
109 if (err)
110 goto err3;
111
112 return 0;
113
114err3:
115 platform_device_put(ucb->ucb1400_ts);
116err2:
117 platform_device_del(ucb->ucb1400_gpio);
118err1:
119 platform_device_put(ucb->ucb1400_gpio);
120err0:
121 kfree(ucb);
122err:
123 return err;
124}
125
126static int ucb1400_core_remove(struct device *dev)
127{
128 struct ucb1400 *ucb = dev_get_drvdata(dev);
129
130 platform_device_unregister(ucb->ucb1400_ts);
131 platform_device_unregister(ucb->ucb1400_gpio);
132
133 kfree(ucb);
134 return 0;
135}
136
137static struct device_driver ucb1400_core_driver = {
138 .name = "ucb1400_core",
139 .bus = &ac97_bus_type,
140 .probe = ucb1400_core_probe,
141 .remove = ucb1400_core_remove,
142};
143
144static int __init ucb1400_core_init(void)
145{
146 return driver_register(&ucb1400_core_driver);
147}
148
149static void __exit ucb1400_core_exit(void)
150{
151 driver_unregister(&ucb1400_core_driver);
152}
153
154module_init(ucb1400_core_init);
155module_exit(ucb1400_core_exit);
156
157MODULE_DESCRIPTION("Philips UCB1400 driver");
158MODULE_LICENSE("GPL");