Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/sound/oss/dmasound/dac3550a.c b/sound/oss/dmasound/dac3550a.c
new file mode 100644
index 0000000..533895e
--- /dev/null
+++ b/sound/oss/dmasound/dac3550a.c
@@ -0,0 +1,210 @@
+/*
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/delay.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;
+
+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);
+
+struct i2c_driver daca_driver = {
+ .owner = THIS_MODULE,
+ .name = "DAC3550A driver V " DACA_VERSION,
+ .id = I2C_DRIVERID_DACA,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = daca_attach_adapter,
+ .detach_client = daca_detach_client,
+};
+
+#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
+ */
+ msleep(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...
+ */
+ msleep(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)
+{
+ const char *client_name = "DAC 3550A Digital Equalizer";
+ struct i2c_client *new_client;
+ int rc = -ENODEV;
+
+ new_client = kmalloc(sizeof(*new_client), GFP_KERNEL);
+ if (!new_client)
+ return -ENOMEM;
+ memset(new_client, 0, sizeof(*new_client));
+
+ new_client->addr = address;
+ new_client->adapter = adapter;
+ new_client->driver = &daca_driver;
+ new_client->flags = 0;
+ strcpy(new_client->name, client_name);
+
+ if (daca_init_client(new_client))
+ goto bail;
+
+ /* Tell the i2c layer a new client has arrived */
+ if (i2c_attach_client(new_client))
+ goto bail;
+
+ return 0;
+ bail:
+ 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;
+}
+
+void daca_cleanup(void)
+{
+ i2c_del_driver(&daca_driver);
+}
+
+int daca_init(void)
+{
+ printk("dac3550a driver version %s (%s)\n",DACA_VERSION,DACA_DATE);
+ return i2c_add_driver(&daca_driver);
+}