patch-2.4.18 linux/drivers/sound/dmasound/dac3550a.c

• Lines: 270
• Date: Mon Jan 7 13:00:34 2002
• Orig file: linux.orig/drivers/sound/dmasound/dac3550a.c
• Orig date: Thu Jan 1 00:00:00 1970

diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/drivers/sound/dmasound/dac3550a.c linux/drivers/sound/dmasound/dac3550a.c
@@ -0,0 +1,269 @@
+/*
+ * Driver for the i2c/i2s based DAC3550a sound chip used
+ * on some Apple iBooks. Also known as "DACA".
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive
+ *  for more details.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/ioport.h>
+#include <linux/sysctl.h>
+#include <linux/types.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+
+#include "dmasound.h"
+
+/* FYI: This code was derived from the tas3001c.c Texas/Tumbler mixer
+ * control code, as well as info derived from the AppleDACAAudio driver
+ * from Darwin CVS (main thing I derived being register numbers and 
+ * values, as well as when to make the calls). */
+
+#define I2C_DRIVERID_DACA (0xFDCB)
+
+#define DACA_VERSION	"0.1"
+#define DACA_DATE "20010930"
+
+static int cur_left_vol;
+static int cur_right_vol;
+static struct i2c_client * daca_client = NULL;
+
+static int daca_attach_adapter(struct i2c_adapter *adapter);
+
+static int daca_attach_adapter(struct i2c_adapter *adapter);
+static int daca_detect_client(struct i2c_adapter *adapter, int address);
+static int daca_detach_client(struct i2c_client *client);
+
+/* Unique ID allocation */
+static int daca_id;
+static int daca_initialized;
+
+struct daca_data
+{
+	int arf; /* place holder for furture use */
+};
+
+struct i2c_driver daca_driver = {  
+	name:		"DAC3550A driver  V " DACA_VERSION,
+	id:		I2C_DRIVERID_DACA,
+	flags:		I2C_DF_NOTIFY,
+	attach_adapter:	&daca_attach_adapter,
+	detach_client:	&daca_detach_client,
+	command:	NULL,
+	inc_use:	NULL, /* &daca_inc_use, */
+	dec_use:	NULL  /* &daca_dev_use  */
+  };
+
+
+#define VOL_MAX ((1<<20) - 1)
+
+void
+daca_get_volume(uint * left_vol, uint  *right_vol)
+{
+	*left_vol = cur_left_vol >> 5;
+	*right_vol = cur_right_vol >> 5;
+}
+
+int
+daca_set_volume(uint left_vol, uint right_vol)
+{
+	unsigned short voldata;
+  
+	if (!daca_client)
+		return -1;
+
+	/* Derived from experience, not from any specific values */
+	left_vol <<= 5;
+	right_vol <<= 5;
+
+	if (left_vol > VOL_MAX)
+		left_vol = VOL_MAX;
+	if (right_vol > VOL_MAX)
+		right_vol = VOL_MAX;
+
+	voldata = ((left_vol >> 14)  & 0x3f) << 8;
+	voldata |= (right_vol >> 14)  & 0x3f;
+  
+	if (i2c_smbus_write_word_data(daca_client, 2, voldata) < 0) {
+		printk("daca: failed to set volume \n");
+		return -1; 
+	}
+
+	cur_left_vol = left_vol;
+	cur_right_vol = right_vol;
+  
+	return 0;
+}
+
+int
+daca_leave_sleep(void)
+{
+	if (!daca_client)
+		return -1;
+  
+	/* Do a short sleep, just to make sure I2C bus is awake and paying
+	 * attention to us
+	 */
+	wait_ms(20);
+	/* Write the sample rate reg the value it needs */
+	i2c_smbus_write_byte_data(daca_client, 1, 8);
+	daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5);
+	/* Another short delay, just to make sure the other I2C bus writes
+	 * have taken...
+	 */
+	wait_ms(20);
+	/* Write the global config reg - invert right power amp,
+	 * DAC on, use 5-volt mode */
+	i2c_smbus_write_byte_data(daca_client, 3, 0x45);
+
+	return 0;
+}
+
+int
+daca_enter_sleep(void)
+{
+	if (!daca_client)
+		return -1;
+
+	i2c_smbus_write_byte_data(daca_client, 1, 8);
+	daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5);
+
+	/* Write the global config reg - invert right power amp,
+	 * DAC on, enter low-power mode, use 5-volt mode
+	 */
+	i2c_smbus_write_byte_data(daca_client, 3, 0x65);
+
+	return 0;
+}
+
+static int
+daca_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!strncmp(adapter->name, "mac-io", 6))
+		daca_detect_client(adapter, 0x4d);
+	return 0;
+}
+
+static int
+daca_init_client(struct i2c_client * new_client)
+{
+	/* 
+	 * Probe is not working with the current i2c-keywest
+	 * driver. We try to use addr 0x4d on each adapters
+	 * instead, by setting the format register.
+	 * 
+	 * FIXME: I'm sure that can be obtained from the
+	 * device-tree. --BenH.
+	 */
+  
+	/* Write the global config reg - invert right power amp,
+	 * DAC on, use 5-volt mode
+	 */
+	if (i2c_smbus_write_byte_data(new_client, 3, 0x45))
+		return -1;
+
+	i2c_smbus_write_byte_data(new_client, 1, 8);
+	daca_client = new_client;
+	daca_set_volume(15000, 15000);
+
+	return 0;
+}
+
+static int
+daca_detect_client(struct i2c_adapter *adapter, int address)
+{
+	int rc = 0;
+	struct i2c_client *new_client;
+
+	struct daca_data *data;
+	const char *client_name = "DAC 3550A Digital Equalizer";
+
+	new_client = kmalloc(
+			sizeof(struct i2c_client) + sizeof(struct daca_data),
+			GFP_KERNEL);
+	if (!new_client) {
+		rc = -ENOMEM;
+		goto bail;
+	}
+
+	/* This is tricky, but it will set the data to the right value. */
+	new_client->data = new_client + 1;
+	data = (struct daca_data *) (new_client->data);
+
+	new_client->addr = address;
+	new_client->data = data;
+	new_client->adapter = adapter;
+	new_client->driver = &daca_driver;
+	new_client->flags = 0;
+
+	strcpy(new_client->name,client_name);
+
+	new_client->id = daca_id++; /* Automatically unique */
+  
+	if (daca_init_client(new_client)) {
+		rc = -ENODEV;
+		goto bail;
+	}
+
+	/* Tell the i2c layer a new client has arrived */
+	if (i2c_attach_client(new_client)) {
+		rc = -ENODEV;
+		goto bail;
+	}
+bail:
+	if (rc && new_client)
+		kfree(new_client);
+	return rc;
+}
+
+
+static int
+daca_detach_client(struct i2c_client *client)
+{
+	if (client == daca_client)
+		daca_client = NULL;
+
+  	i2c_detach_client(client);
+	kfree(client);
+
+	return 0;
+}
+
+int
+daca_cleanup(void)
+{
+	if (!daca_initialized)
+		return -ENODEV;
+	i2c_del_driver(&daca_driver);
+	daca_initialized = 0;
+
+	return 0;
+}
+
+int
+daca_init(void)
+{
+	int rc;
+
+	if (daca_initialized)
+		return 0;
+		
+	printk("dac3550a driver version %s (%s)\n",DACA_VERSION,DACA_DATE);
+    
+	if ((rc = i2c_add_driver(&daca_driver))) {
+		printk("dac3550a: Driver registration failed, module not inserted.\n");
+		daca_cleanup();
+		return rc;
+	}
+	daca_initialized = 1;
+
+	return 0;
+}