1/*
2 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
3 *
4 *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
5 *
6 *	Copyright (c) 2000 Jaroslav Kysela <perex@suse.cz>
7 *
8 *   This program is free software; you can redistribute it and/or modify
9 *   it under the terms of the GNU General Public License as published by
10 *   the Free Software Foundation; either version 2 of the License, or
11 *   (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21 *
22 */
23
24#include <sound/driver.h>
25#include <asm/io.h>
26#include <linux/delay.h>
27#include <linux/interrupt.h>
28#include <linux/init.h>
29#include <sound/core.h>
30#include <sound/initval.h>
31#include "ice1712.h"
32
33MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
34MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
35MODULE_LICENSE("GPL");
36
37static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
38{
39	struct snd_ice1712 *ice = ak->private_data[0];
40
41	snd_ice1712_save_gpio_status(ice);
42}
43
44static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
45{
46	struct snd_ice1712 *ice = ak->private_data[0];
47
48	snd_ice1712_restore_gpio_status(ice);
49}
50
51/*
52 * write AK4xxx register
53 */
54static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
55				      unsigned char addr, unsigned char data)
56{
57	unsigned int tmp;
58	int idx;
59	unsigned int addrdata;
60	struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
61	struct snd_ice1712 *ice = ak->private_data[0];
62
63	snd_assert(chip >= 0 && chip < 4, return);
64
65	tmp = snd_ice1712_gpio_read(ice);
66	tmp |= priv->add_flags;
67	tmp &= ~priv->mask_flags;
68	if (priv->cs_mask == priv->cs_addr) {
69		if (priv->cif) {
70			tmp |= priv->cs_mask; /* start without chip select */
71		}  else {
72			tmp &= ~priv->cs_mask; /* chip select low */
73			snd_ice1712_gpio_write(ice, tmp);
74			udelay(1);
75		}
76	} else {
77		/* doesn't handle cf=1 yet */
78		tmp &= ~priv->cs_mask;
79		tmp |= priv->cs_addr;
80		snd_ice1712_gpio_write(ice, tmp);
81		udelay(1);
82	}
83
84	/* build I2C address + data byte */
85	addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
86	addrdata = (addrdata << 8) | data;
87	for (idx = 15; idx >= 0; idx--) {
88		/* drop clock */
89		tmp &= ~priv->clk_mask;
90		snd_ice1712_gpio_write(ice, tmp);
91		udelay(1);
92		/* set data */
93		if (addrdata & (1 << idx))
94			tmp |= priv->data_mask;
95		else
96			tmp &= ~priv->data_mask;
97		snd_ice1712_gpio_write(ice, tmp);
98		udelay(1);
99		/* raise clock */
100		tmp |= priv->clk_mask;
101		snd_ice1712_gpio_write(ice, tmp);
102		udelay(1);
103	}
104
105	if (priv->cs_mask == priv->cs_addr) {
106		if (priv->cif) {
107			/* assert a cs pulse to trigger */
108			tmp &= ~priv->cs_mask;
109			snd_ice1712_gpio_write(ice, tmp);
110			udelay(1);
111		}
112		tmp |= priv->cs_mask; /* chip select high to trigger */
113	} else {
114		tmp &= ~priv->cs_mask;
115		tmp |= priv->cs_none; /* deselect address */
116	}
117	snd_ice1712_gpio_write(ice, tmp);
118	udelay(1);
119}
120
121/*
122 * initialize the struct snd_akm4xxx record with the template
123 */
124int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
125			     const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
126{
127	struct snd_ak4xxx_private *priv;
128
129	if (_priv != NULL) {
130		priv = kmalloc(sizeof(*priv), GFP_KERNEL);
131		if (priv == NULL)
132			return -ENOMEM;
133		*priv = *_priv;
134	} else {
135		priv = NULL;
136	}
137	*ak = *temp;
138	ak->card = ice->card;
139        ak->private_value[0] = (unsigned long)priv;
140	ak->private_data[0] = ice;
141	if (ak->ops.lock == NULL)
142		ak->ops.lock = snd_ice1712_akm4xxx_lock;
143	if (ak->ops.unlock == NULL)
144		ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
145	if (ak->ops.write == NULL)
146		ak->ops.write = snd_ice1712_akm4xxx_write;
147	snd_akm4xxx_init(ak);
148	return 0;
149}
150
151void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
152{
153	unsigned int akidx;
154	if (ice->akm == NULL)
155		return;
156	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
157		struct snd_akm4xxx *ak = &ice->akm[akidx];
158		kfree((void*)ak->private_value[0]);
159	}
160	kfree(ice->akm);
161}
162
163/*
164 * build AK4xxx controls
165 */
166int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
167{
168	unsigned int akidx;
169	int err;
170
171	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
172		struct snd_akm4xxx *ak = &ice->akm[akidx];
173		err = snd_akm4xxx_build_controls(ak);
174		if (err < 0)
175			return err;
176	}
177	return 0;
178}
179
180static int __init alsa_ice1712_akm4xxx_module_init(void)
181{
182	return 0;
183}
184
185static void __exit alsa_ice1712_akm4xxx_module_exit(void)
186{
187}
188
189module_init(alsa_ice1712_akm4xxx_module_init)
190module_exit(alsa_ice1712_akm4xxx_module_exit)
191
192EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
193EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
194EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);
195