V4L/DVB (6486): m52790: add new Mitsubishi A/V switch i2c driver

This driver is used by the ASUS Falcon2 cx23416-based cards.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/media/video/m52790.c b/drivers/media/video/m52790.c
new file mode 100644
index 000000000000..51ecbfbc1ae7
--- /dev/null
+++ b/drivers/media/video/m52790.c
@@ -0,0 +1,172 @@
+/*
+ * 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/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/videodev.h>
+#include <media/m52790.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-i2c-drv-legacy.h>
+
+MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
+MODULE_AUTHOR("Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+static unsigned short normal_i2c[] = { 0x90 >> 1, I2C_CLIENT_END };
+
+
+I2C_CLIENT_INSMOD;
+
+struct m52790_state {
+        u16 input;
+        u16 output;
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int m52790_write(struct i2c_client *client)
+{
+        struct m52790_state *state = i2c_get_clientdata(client);
+        u8 sw1 = (state->input | state->output) & 0xff;
+        u8 sw2 = (state->input | state->output) >> 8;
+
+        return i2c_smbus_write_byte_data(client, sw1, sw2);
+}
+
+static int m52790_command(struct i2c_client *client, unsigned int cmd,
+                            void *arg)
+{
+        struct m52790_state *state = i2c_get_clientdata(client);
+        struct v4l2_routing *route = arg;
+
+        /* 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. */
+        switch (cmd) {
+        case VIDIOC_INT_G_AUDIO_ROUTING:
+        case VIDIOC_INT_G_VIDEO_ROUTING:
+                route->input = state->input;
+                route->output = state->output;
+                break;
+
+        case VIDIOC_INT_S_AUDIO_ROUTING:
+        case VIDIOC_INT_S_VIDEO_ROUTING:
+                state->input = route->input;
+                state->output = route->output;
+                m52790_write(client);
+                break;
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        case VIDIOC_DBG_G_REGISTER:
+        case VIDIOC_DBG_S_REGISTER:
+        {
+                struct v4l2_register *reg = arg;
+
+                if (!v4l2_chip_match_i2c_client(client,
+                                        reg->match_type, reg->match_chip))
+                        return -EINVAL;
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EPERM;
+                if (reg->reg != 0)
+                        return -EINVAL;
+                if (cmd == VIDIOC_DBG_G_REGISTER)
+                        reg->val = state->input | state->output;
+                else {
+                        state->input = reg->val & 0x0303;
+                        state->output = reg->val & ~0x0303;
+                        m52790_write(client);
+                }
+                break;
+        }
+#endif
+
+        case VIDIOC_G_CHIP_IDENT:
+                return v4l2_chip_ident_i2c_client(client, arg,
+                                V4L2_IDENT_M52790, 0);
+
+        case VIDIOC_LOG_STATUS:
+                v4l_info(client, "Switch 1: %02x\n",
+                                (state->input | state->output) & 0xff);
+                v4l_info(client, "Switch 2: %02x\n",
+                                (state->input | state->output) >> 8);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+static int m52790_probe(struct i2c_client *client)
+{
+        struct m52790_state *state;
+
+        /* Check if the adapter supports the needed features */
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+
+        snprintf(client->name, sizeof(client->name) - 1, "m52790");
+
+        v4l_info(client, "chip found @ 0x%x (%s)\n",
+                        client->addr << 1, client->adapter->name);
+
+        state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
+        if (state == NULL)
+                return -ENOMEM;
+
+        state->input = M52790_IN_TUNER;
+        state->output = M52790_OUT_STEREO;
+        i2c_set_clientdata(client, state);
+        m52790_write(client);
+        return 0;
+}
+
+static int m52790_remove(struct i2c_client *client)
+{
+        kfree(i2c_get_clientdata(client));
+        return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
+        .name = "m52790",
+        .driverid = I2C_DRIVERID_M52790,
+        .command = m52790_command,
+        .probe = m52790_probe,
+        .remove = m52790_remove,
+};
+