1/*
2 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
3 *
4 *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
5 *
6 *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.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 <linux/io.h>
25#include <linux/delay.h>
26#include <linux/interrupt.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/module.h>
30#include <sound/core.h>
31#include <sound/initval.h>
32#include "ice1712.h"
33
34MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
35MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
36MODULE_LICENSE("GPL");
37
38static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
39{
40	struct snd_ice1712 *ice = ak->private_data[0];
41
42	snd_ice1712_save_gpio_status(ice);
43}
44
45static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
46{
47	struct snd_ice1712 *ice = ak->private_data[0];
48
49	snd_ice1712_restore_gpio_status(ice);
50}
51
52/*
53 * write AK4xxx register
54 */
55static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
56				      unsigned char addr, unsigned char data)
57{
58	unsigned int tmp;
59	int idx;
60	unsigned int addrdata;
61	struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
62	struct snd_ice1712 *ice = ak->private_data[0];
63
64	if (snd_BUG_ON(chip < 0 || chip >= 4))
65		return;
66
67	tmp = snd_ice1712_gpio_read(ice);
68	tmp |= priv->add_flags;
69	tmp &= ~priv->mask_flags;
70	if (priv->cs_mask == priv->cs_addr) {
71		if (priv->cif) {
72			tmp |= priv->cs_mask; /* start without chip select */
73		}  else {
74			tmp &= ~priv->cs_mask; /* chip select low */
75			snd_ice1712_gpio_write(ice, tmp);
76			udelay(1);
77		}
78	} else {
79		/* doesn't handle cf=1 yet */
80		tmp &= ~priv->cs_mask;
81		tmp |= priv->cs_addr;
82		snd_ice1712_gpio_write(ice, tmp);
83		udelay(1);
84	}
85
86	/* build I2C address + data byte */
87	addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
88	addrdata = (addrdata << 8) | data;
89	for (idx = 15; idx >= 0; idx--) {
90		/* drop clock */
91		tmp &= ~priv->clk_mask;
92		snd_ice1712_gpio_write(ice, tmp);
93		udelay(1);
94		/* set data */
95		if (addrdata & (1 << idx))
96			tmp |= priv->data_mask;
97		else
98			tmp &= ~priv->data_mask;
99		snd_ice1712_gpio_write(ice, tmp);
100		udelay(1);
101		/* raise clock */
102		tmp |= priv->clk_mask;
103		snd_ice1712_gpio_write(ice, tmp);
104		udelay(1);
105	}
106
107	if (priv->cs_mask == priv->cs_addr) {
108		if (priv->cif) {
109			/* assert a cs pulse to trigger */
110			tmp &= ~priv->cs_mask;
111			snd_ice1712_gpio_write(ice, tmp);
112			udelay(1);
113		}
114		tmp |= priv->cs_mask; /* chip select high to trigger */
115	} else {
116		tmp &= ~priv->cs_mask;
117		tmp |= priv->cs_none; /* deselect address */
118	}
119	snd_ice1712_gpio_write(ice, tmp);
120	udelay(1);
121}
122
123/*
124 * initialize the struct snd_akm4xxx record with the template
125 */
126int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
127			     const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
128{
129	struct snd_ak4xxx_private *priv;
130
131	if (_priv != NULL) {
132		priv = kmalloc(sizeof(*priv), GFP_KERNEL);
133		if (priv == NULL)
134			return -ENOMEM;
135		*priv = *_priv;
136	} else {
137		priv = NULL;
138	}
139	*ak = *temp;
140	ak->card = ice->card;
141        ak->private_value[0] = (unsigned long)priv;
142	ak->private_data[0] = ice;
143	if (ak->ops.lock == NULL)
144		ak->ops.lock = snd_ice1712_akm4xxx_lock;
145	if (ak->ops.unlock == NULL)
146		ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
147	if (ak->ops.write == NULL)
148		ak->ops.write = snd_ice1712_akm4xxx_write;
149	snd_akm4xxx_init(ak);
150	return 0;
151}
152
153void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
154{
155	unsigned int akidx;
156	if (ice->akm == NULL)
157		return;
158	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
159		struct snd_akm4xxx *ak = &ice->akm[akidx];
160		kfree((void*)ak->private_value[0]);
161	}
162	kfree(ice->akm);
163}
164
165/*
166 * build AK4xxx controls
167 */
168int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
169{
170	unsigned int akidx;
171	int err;
172
173	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
174		struct snd_akm4xxx *ak = &ice->akm[akidx];
175		err = snd_akm4xxx_build_controls(ak);
176		if (err < 0)
177			return err;
178	}
179	return 0;
180}
181
182static int __init alsa_ice1712_akm4xxx_module_init(void)
183{
184	return 0;
185}
186
187static void __exit alsa_ice1712_akm4xxx_module_exit(void)
188{
189}
190
191module_init(alsa_ice1712_akm4xxx_module_init)
192module_exit(alsa_ice1712_akm4xxx_module_exit)
193
194EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
195EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
196EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);
197