diff options
Diffstat (limited to 'drivers/media/video/m52790.c')
| -rw-r--r-- | drivers/media/video/m52790.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/media/video/m52790.c b/drivers/media/video/m52790.c new file mode 100644 index 000000000000..d4bf14c284ef --- /dev/null +++ b/drivers/media/video/m52790.c @@ -0,0 +1,168 @@ +/* + * 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.h> + +MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); +MODULE_AUTHOR("Hans Verkuil"); +MODULE_LICENSE("GPL"); + + +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, +}; + |