--- /dev/null
+/*
+ * tlv320aic23b - driver version 0.0.1
+ *
+ * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
+ *
+ * Based on wm8775 driver
+ *
+ * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
+ * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ * This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/videodev.h>
+#include <media/v4l2-common.h>
+
+MODULE_DESCRIPTION("tlv320aic23b driver");
+MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
+
+
+I2C_CLIENT_INSMOD;
+
+/* ----------------------------------------------------------------------- */
+
+struct tlv320aic23b_state {
+ u8 muted;
+};
+
+static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
+{
+ int i;
+
+ if ((reg < 0 || reg > 9) && (reg != 15)) {
+ v4l_err(client, "Invalid register R%d\n", reg);
+ return -1;
+ }
+
+ for (i = 0; i < 3; i++) {
+ if (i2c_smbus_write_byte_data(client, (reg << 1) |
+ (val >> 8), val & 0xff) == 0) {
+ return 0;
+ }
+ }
+ v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
+ return -1;
+}
+
+static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
+ void *arg)
+{
+ struct tlv320aic23b_state *state = i2c_get_clientdata(client);
+ struct v4l2_control *ctrl = arg;
+ u32* freq = arg;
+
+ switch (cmd) {
+ case VIDIOC_INT_AUDIO_CLOCK_FREQ:
+ switch (*freq) {
+ case 32000: /* set sample rate to 32 kHz */
+ tlv320aic23b_write(client, 8, 0x018);
+ break;
+ case 44100: /* set sample rate to 44.1 kHz */
+ tlv320aic23b_write(client, 8, 0x022);
+ break;
+ case 48000: /* set sample rate to 48 kHz */
+ tlv320aic23b_write(client, 8, 0x000);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case VIDIOC_G_CTRL:
+ if (ctrl->id != V4L2_CID_AUDIO_MUTE)
+ return -EINVAL;
+ ctrl->value = state->muted;
+ break;
+
+ case VIDIOC_S_CTRL:
+ if (ctrl->id != V4L2_CID_AUDIO_MUTE)
+ return -EINVAL;
+ state->muted = ctrl->value;
+ tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
+ /* set gain on both channels to +3.0 dB */
+ if (!state->muted)
+ tlv320aic23b_write(client, 0, 0x119);
+ break;
+
+ case VIDIOC_LOG_STATUS:
+ v4l_info(client, "Input: %s\n",
+ state->muted ? "muted" : "active");
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static struct i2c_driver i2c_driver;
+
+static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
+{
+ struct i2c_client *client;
+ struct tlv320aic23b_state *state;
+
+ /* Check if the adapter supports the needed features */
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return 0;
+
+ client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
+ if (client == 0)
+ return -ENOMEM;
+
+ client->addr = address;
+ client->adapter = adapter;
+ client->driver = &i2c_driver;
+ snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
+
+ v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
+
+ state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
+ if (state == NULL) {
+ kfree(client);
+ return -ENOMEM;
+ }
+ state->muted = 0;
+ i2c_set_clientdata(client, state);
+
+ /* initialize tlv320aic23b */
+ tlv320aic23b_write(client, 15, 0x000); /* RESET */
+ tlv320aic23b_write(client, 6, 0x00A); /* turn off DAC & mic input */
+ tlv320aic23b_write(client, 7, 0x049); /* left-justified, 24-bit, master mode */
+ tlv320aic23b_write(client, 0, 0x119); /* set gain on both channels to +3.0 dB */
+ tlv320aic23b_write(client, 8, 0x000); /* set sample rate to 48 kHz */
+ tlv320aic23b_write(client, 9, 0x001); /* activate digital interface */
+
+ i2c_attach_client(client);
+
+ return 0;
+}
+
+static int tlv320aic23b_probe(struct i2c_adapter *adapter)
+{
+ if (adapter->class & I2C_CLASS_TV_ANALOG)
+ return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
+ return 0;
+}
+
+static int tlv320aic23b_detach(struct i2c_client *client)
+{
+ int err;
+
+ err = i2c_detach_client(client);
+ if (err) {
+ return err;
+ }
+ kfree(client);
+
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+static struct i2c_driver i2c_driver = {
+ .driver = {
+ .name = "tlv320aic23b",
+ },
+ .id = I2C_DRIVERID_TLV320AIC23B,
+ .attach_adapter = tlv320aic23b_probe,
+ .detach_client = tlv320aic23b_detach,
+ .command = tlv320aic23b_command,
+};
+
+
+static int __init tlv320aic23b_init_module(void)
+{
+ return i2c_add_driver(&i2c_driver);
+}
+
+static void __exit tlv320aic23b_cleanup_module(void)
+{
+ i2c_del_driver(&i2c_driver);
+}
+
+module_init(tlv320aic23b_init_module);
+module_exit(tlv320aic23b_cleanup_module);
projects / linux-2.6 / commitdiff