--- /dev/null
+/*
+ * m52790 i2c ivtv driver.
+ * Copyright (C) 2007 Hans Verkuil
+ *
+ * A/V source switching Mitsubishi M52790SP/FP
+ *
+ * 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/slab.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/m52790.h>
+#include <media/v4l2-device.h>
+
+MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
+MODULE_AUTHOR("Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+
+struct m52790_state {
+ struct v4l2_subdev sd;
+ u16 input;
+ u16 output;
+};
+
+static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct m52790_state, sd);
+}
+
+/* ----------------------------------------------------------------------- */
+
+static int m52790_write(struct v4l2_subdev *sd)
+{
+ struct m52790_state *state = to_state(sd);
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ u8 sw1 = (state->input | state->output) & 0xff;
+ u8 sw2 = (state->input | state->output) >> 8;
+
+ return i2c_smbus_write_byte_data(client, sw1, sw2);
+}
+
+/* Note: audio and video are linked and cannot be switched separately.
+ So audio and video routing commands are identical for this chip.
+ In theory the video amplifier and audio modes could be handled
+ separately for the output, but that seems to be overkill right now.
+ The same holds for implementing an audio mute control, this is now
+ part of the audio output routing. The normal case is that another
+ chip takes care of the actual muting so making it part of the
+ output routing seems to be the right thing to do for now. */
+static int m52790_s_routing(struct v4l2_subdev *sd,
+ u32 input, u32 output, u32 config)
+{
+ struct m52790_state *state = to_state(sd);
+
+ state->input = input;
+ state->output = output;
+ m52790_write(sd);
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
+{
+ struct m52790_state *state = to_state(sd);
+
+ if (reg->reg != 0)
+ return -EINVAL;
+ reg->size = 1;
+ reg->val = state->input | state->output;
+ return 0;
+}
+
+static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
+{
+ struct m52790_state *state = to_state(sd);
+
+ if (reg->reg != 0)
+ return -EINVAL;
+ state->input = reg->val & 0x0303;
+ state->output = reg->val & ~0x0303;
+ m52790_write(sd);
+ return 0;
+}
+#endif
+
+static int m52790_log_status(struct v4l2_subdev *sd)
+{
+ struct m52790_state *state = to_state(sd);
+
+ v4l2_info(sd, "Switch 1: %02x\n",
+ (state->input | state->output) & 0xff);
+ v4l2_info(sd, "Switch 2: %02x\n",
+ (state->input | state->output) >> 8);
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops m52790_core_ops = {
+ .log_status = m52790_log_status,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .g_register = m52790_g_register,
+ .s_register = m52790_s_register,
+#endif
+};
+
+static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
+ .s_routing = m52790_s_routing,
+};
+
+static const struct v4l2_subdev_video_ops m52790_video_ops = {
+ .s_routing = m52790_s_routing,
+};
+
+static const struct v4l2_subdev_ops m52790_ops = {
+ .core = &m52790_core_ops,
+ .audio = &m52790_audio_ops,
+ .video = &m52790_video_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+static int m52790_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct m52790_state *state;
+ struct v4l2_subdev *sd;
+
+ /* 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 = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+
+ sd = &state->sd;
+ v4l2_i2c_subdev_init(sd, client, &m52790_ops);
+ state->input = M52790_IN_TUNER;
+ state->output = M52790_OUT_STEREO;
+ m52790_write(sd);
+ return 0;
+}
+
+static int m52790_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct i2c_device_id m52790_id[] = {
+ { "m52790", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, m52790_id);
+
+static struct i2c_driver m52790_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "m52790",
+ },
+ .probe = m52790_probe,
+ .remove = m52790_remove,
+ .id_table = m52790_id,
+};
+
+module_i2c_driver(m52790_driver);
Code Review / kvmfornfv.git / blobdiff