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bertos/drv/tas5706a.c

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief TAS5706A Power DAC i2c driver.
+ *
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#include "tas5706a.h"
+
+#include "hw/hw_tas5706a.h"
+
+#include "cfg/cfg_tas5706a.h"
+#include "cfg/cfg_i2c.h"
+
+#include <cfg/module.h>
+
+#include <drv/i2c.h>
+#include <drv/timer.h>
+
+typedef uint8_t tas_addr_t;
+
+#define TAS_ADDR 0x36
+
+#define TRIM_REG   0x1B
+#define SYS_REG2   0x05
+#define VOLUME_REG 0x07
+#define MUTE_VOL 0xFF
+
+#define DB_TO_REG(db) ((24 - (db)) * 2)
+
+#define CH1_VOL_REG 0x08
+#define CH2_VOL_REG 0x09
+#define CH3_VOL_REG 0x0A
+#define CH4_VOL_REG 0x0B
+
+
+INLINE bool tas5706a_putc(I2c *i2c, tas_addr_t addr, uint8_t ch)
+{
+	i2c_start_w(i2c, TAS_ADDR, 2, I2C_STOP);
+	i2c_putc(i2c, addr);
+	i2c_putc(i2c, ch);
+
+	if (i2c_error(i2c))
+		return false;
+
+	return true;
+}
+
+INLINE int tas5706a_getc(I2c *i2c, tas_addr_t addr)
+{
+	int ch;
+
+	i2c_start_w(i2c, TAS_ADDR, 2, I2C_NOSTOP);
+	i2c_putc(i2c, addr);
+	i2c_start_r(i2c, TAS_ADDR, 1, I2C_STOP);
+	ch = (int)(uint8_t)i2c_getc(i2c);
+
+	if (i2c_error(i2c))
+		return EOF;
+
+	return ch;
+}
+
+void tas5706a_setVolume_3(I2c *i2c, Tas5706aCh ch, tas5706a_vol_t vol)
+{
+	ASSERT(ch < TAS_CNT);
+	ASSERT(vol <= TAS_VOL_MAX);
+
+	tas_addr_t addr1, addr2;
+
+	switch(ch)
+	{
+		case TAS_CH1:
+			addr1 = CH1_VOL_REG;
+			addr2 = CH3_VOL_REG;
+			break;
+		case TAS_CH2:
+			addr1 = CH2_VOL_REG;
+			addr2 = CH4_VOL_REG;
+			break;
+		default:
+			ASSERT(0);
+			return;
+	}
+
+	uint8_t vol_att = 0xff - ((vol * 0xff) / TAS_VOL_MAX);
+
+	tas5706a_putc(i2c, addr1, vol_att);
+	tas5706a_putc(i2c, addr2, vol_att);
+}
+
+void tas5706a_setLowPower_2(I2c *i2c, bool val)
+{
+	ASSERT(i2c);
+
+	TAS5706A_SETPOWERDOWN(val);
+	TAS5706A_SETMUTE(val);
+}
+
+
+void tas5706a_init_1(I2c *i2c)
+{
+	ASSERT(i2c);
+	MOD_CHECK(timer);
+
+	TAS5706A_PIN_INIT();
+	timer_delay(200);
+	TAS5706A_SETPOWERDOWN(false);
+	TAS5706A_SETMUTE(false);
+	TAS5706A_MCLK_INIT();
+	timer_delay(2);
+	TAS5706A_SETRESET(false);
+	timer_delay(20);
+	tas5706a_putc(i2c, TRIM_REG, 0x00);
+
+	tas5706a_putc(i2c, VOLUME_REG, DB_TO_REG(CONFIG_TAS_MAX_VOL));
+
+	/* Unmute */
+	tas5706a_putc(i2c, SYS_REG2, 0);
+}