diff options
Diffstat (limited to 'drivers/media/i2c/m52790.c')
| -rw-r--r-- | drivers/media/i2c/m52790.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/media/i2c/m52790.c b/drivers/media/i2c/m52790.c new file mode 100644 index 0000000..c0dee5b --- /dev/null +++ b/drivers/media/i2c/m52790.c @@ -0,0 +1,216 @@ +/* + * 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> +#include <media/v4l2-chip-ident.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 CPTCFG_VIDEO_ADV_DEBUG +static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) +{ + struct m52790_state *state = to_state(sd); + struct i2c_client *client = v4l2_get_subdevdata(sd); + + if (!v4l2_chip_match_i2c_client(client, ®->match)) + return -EINVAL; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + 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); + struct i2c_client *client = v4l2_get_subdevdata(sd); + + if (!v4l2_chip_match_i2c_client(client, ®->match)) + return -EINVAL; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + 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_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); +} + +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, + .g_chip_ident = m52790_g_chip_ident, +#ifdef CPTCFG_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 = kzalloc(sizeof(struct m52790_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); + kfree(to_state(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); |