Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 231 insertions, 0 deletions

diff --git a/drivers/media/video/wm8775.c b/drivers/media/video/wm8775.c
new file mode 100644
index 0000000..48df661
--- /dev/null
+++ b/drivers/media/video/wm8775.c
@@ -0,0 +1,231 @@
+/*
+ * wm8775 - driver version 0.0.1
+ *
+ * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
+ *
+ * Based on saa7115 driver
+ *
+ * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
+ * - Cleanup
+ * - V4L2 API update
+ * - sound fixes
+ *
+ * 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/videodev2.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-i2c-drv-legacy.h>
+
+MODULE_DESCRIPTION("wm8775 driver");
+MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
+
+I2C_CLIENT_INSMOD;
+
+
+/* ----------------------------------------------------------------------- */
+
+enum {
+	R7 = 7, R11 = 11,
+	R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
+	TOT_REGS
+};
+
+struct wm8775_state {
+	u8 input;		/* Last selected input (0-0xf) */
+	u8 muted;
+};
+
+static int wm8775_write(struct i2c_client *client, int reg, u16 val)
+{
+	int i;
+
+	if (reg < 0 || reg >= TOT_REGS) {
+		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 wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
+{
+	struct wm8775_state *state = i2c_get_clientdata(client);
+	struct v4l2_routing *route = arg;
+	struct v4l2_control *ctrl = arg;
+
+	switch (cmd) {
+	case VIDIOC_INT_G_AUDIO_ROUTING:
+		route->input = state->input;
+		route->output = 0;
+		break;
+
+	case VIDIOC_INT_S_AUDIO_ROUTING:
+		/* There are 4 inputs and one output. Zero or more inputs
+		   are multiplexed together to the output. Hence there are
+		   16 combinations.
+		   If only one input is active (the normal case) then the
+		   input values 1, 2, 4 or 8 should be used. */
+		if (route->input > 15) {
+			v4l_err(client, "Invalid input %d.\n", route->input);
+			return -EINVAL;
+		}
+		state->input = route->input;
+		if (state->muted)
+			break;
+		wm8775_write(client, R21, 0x0c0);
+		wm8775_write(client, R14, 0x1d4);
+		wm8775_write(client, R15, 0x1d4);
+		wm8775_write(client, R21, 0x100 + state->input);
+		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;
+		wm8775_write(client, R21, 0x0c0);
+		wm8775_write(client, R14, 0x1d4);
+		wm8775_write(client, R15, 0x1d4);
+		if (!state->muted)
+			wm8775_write(client, R21, 0x100 + state->input);
+		break;
+
+	case VIDIOC_G_CHIP_IDENT:
+		return v4l2_chip_ident_i2c_client(client,
+				arg, V4L2_IDENT_WM8775, 0);
+
+	case VIDIOC_LOG_STATUS:
+		v4l_info(client, "Input: %d%s\n", state->input,
+			    state->muted ? " (muted)" : "");
+		break;
+
+	case VIDIOC_S_FREQUENCY:
+		/* If I remove this, then it can happen that I have no
+		   sound the first time I tune from static to a valid channel.
+		   It's difficult to reproduce and is almost certainly related
+		   to the zero cross detect circuit. */
+		wm8775_write(client, R21, 0x0c0);
+		wm8775_write(client, R14, 0x1d4);
+		wm8775_write(client, R15, 0x1d4);
+		wm8775_write(client, R21, 0x100 + state->input);
+		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 int wm8775_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct wm8775_state *state;
+
+	/* Check if the adapter supports the needed features */
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -EIO;
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
+	if (state == NULL)
+		return -ENOMEM;
+	state->input = 2;
+	state->muted = 0;
+	i2c_set_clientdata(client, state);
+
+	/* Initialize wm8775 */
+
+	/* RESET */
+	wm8775_write(client, R23, 0x000);
+	/* Disable zero cross detect timeout */
+	wm8775_write(client, R7, 0x000);
+	/* Left justified, 24-bit mode */
+	wm8775_write(client, R11, 0x021);
+	/* Master mode, clock ratio 256fs */
+	wm8775_write(client, R12, 0x102);
+	/* Powered up */
+	wm8775_write(client, R13, 0x000);
+	/* ADC gain +2.5dB, enable zero cross */
+	wm8775_write(client, R14, 0x1d4);
+	/* ADC gain +2.5dB, enable zero cross */
+	wm8775_write(client, R15, 0x1d4);
+	/* ALC Stereo, ALC target level -1dB FS max gain +8dB */
+	wm8775_write(client, R16, 0x1bf);
+	/* Enable gain control, use zero cross detection,
+	   ALC hold time 42.6 ms */
+	wm8775_write(client, R17, 0x185);
+	/* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
+	wm8775_write(client, R18, 0x0a2);
+	/* Enable noise gate, threshold -72dBfs */
+	wm8775_write(client, R19, 0x005);
+	/* Transient window 4ms, lower PGA gain limit -1dB */
+	wm8775_write(client, R20, 0x07a);
+	/* LRBOTH = 1, use input 2. */
+	wm8775_write(client, R21, 0x102);
+	return 0;
+}
+
+static int wm8775_remove(struct i2c_client *client)
+{
+	kfree(i2c_get_clientdata(client));
+	return 0;
+}
+
+static const struct i2c_device_id wm8775_id[] = {
+	{ "wm8775", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm8775_id);
+
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
+	.name = "wm8775",
+	.driverid = I2C_DRIVERID_WM8775,
+	.command = wm8775_command,
+	.probe = wm8775_probe,
+	.remove = wm8775_remove,
+	.id_table = wm8775_id,
+};