2 * Copyright (C) 2012 Samsung Electronics
3 * R. Chandrasekar <rcsekar@samsung.com>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
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.
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,
31 #include <asm/arch/sound.h>
34 #define SOUND_400_HZ 400
35 #define SOUND_BITS_IN_BYTE 8
37 static struct i2stx_info g_i2stx_pri;
38 static struct sound_codec_info g_codec_info;
41 * get_sound_fdt_values gets fdt values for i2s parameters
43 * @param i2stx_info i2s transmitter transfer param structure
44 * @param blob FDT blob
46 static void get_sound_i2s_values(struct i2stx_info *i2s)
48 i2s->base_address = samsung_get_base_i2s();
49 i2s->audio_pll_clk = I2S_PLL_CLK;
50 i2s->samplingrate = I2S_SAMPLING_RATE;
51 i2s->bitspersample = I2S_BITS_PER_SAMPLE;
52 i2s->channels = I2S_CHANNELS;
58 * Gets fdt values for wm8994 config parameters
60 * @param pcodec_info codec information structure
61 * @param blob FDT blob
62 * @return int value, 0 for success
64 static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
68 switch (AUDIO_COMPAT) {
69 case AUDIO_COMPAT_SPI:
70 debug("%s: Support not added for SPI interface\n", __func__);
73 case AUDIO_COMPAT_I2C:
74 pcodec_info->i2c_bus = AUDIO_I2C_BUS;
75 pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
76 debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
79 debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
84 debug("fail to get wm8994 codec node properties\n");
92 * Gets fdt values for codec config parameters
94 * @param pcodec_info codec information structure
95 * @param blob FDT blob
96 * @return int value, 0 for success
98 static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
101 const char *codectype;
103 codectype = AUDIO_CODEC;
105 if (!strcmp(codectype, "wm8994")) {
106 pcodec_info->codec_type = CODEC_WM_8994;
107 error = get_sound_wm8994_values(pcodec_info);
113 debug("fail to get sound codec node properties\n");
123 struct i2stx_info *pi2s_tx = &g_i2stx_pri;
124 struct sound_codec_info *pcodec_info = &g_codec_info;
126 /* Get the I2S Values */
127 get_sound_i2s_values(pi2s_tx);
129 /* Get the codec Values */
130 if (get_sound_codec_values(pcodec_info) < 0)
133 ret = i2s_tx_init(pi2s_tx);
135 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
140 /* Check the codec type and initialise the same */
141 if (pcodec_info->codec_type == CODEC_WM_8994) {
142 ret = wm8994_init(pcodec_info, WM8994_AIF2,
143 pi2s_tx->samplingrate,
144 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
145 pi2s_tx->bitspersample, pi2s_tx->channels);
147 debug("%s: Unknown code type %d\n", __func__,
148 pcodec_info->codec_type);
152 debug("%s: Codec init failed\n", __func__);
160 * Generates square wave sound data for 1 second
162 * @param data data buffer pointer
163 * @param size size of the buffer
164 * @param freq frequency of the wave
166 static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
168 const int sample = 48000;
169 const unsigned short amplitude = 16000; /* between 1 and 32767 */
170 const int period = freq ? sample / freq : 0;
171 const int half = period / 2;
175 /* Make sure we don't overflow our buffer */
181 for (i = 0; size && i < half; i++) {
186 for (i = 0; size && i < period - half; i++) {
188 *data++ = -amplitude;
189 *data++ = -amplitude;
194 int sound_play(uint32_t msec, uint32_t frequency)
197 unsigned long data_size;
198 unsigned int ret = 0;
200 /*Buffer length computation */
201 data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
202 data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
203 data = malloc(data_size);
206 debug("%s: malloc failed\n", __func__);
210 sound_prepare_buffer((unsigned short *)data,
211 data_size / sizeof(unsigned short), frequency);
213 while (msec >= 1000) {
214 ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
215 (data_size / sizeof(int)));
220 (data_size * msec) / (sizeof(int) * 1000);
222 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);