Hans Verkuil | 761dacd | 2007-10-30 05:41:25 -0300 | [diff] [blame] | 1 | /* |
| 2 | * m52790 i2c ivtv driver. |
| 3 | * Copyright (C) 2007 Hans Verkuil |
| 4 | * |
| 5 | * A/V source switching Mitsubishi M52790SP/FP |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/ioctl.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <linux/i2c.h> |
| 28 | #include <linux/i2c-id.h> |
| 29 | #include <linux/videodev.h> |
| 30 | #include <media/m52790.h> |
| 31 | #include <media/v4l2-common.h> |
| 32 | #include <media/v4l2-chip-ident.h> |
Hans Verkuil | f69d419 | 2007-12-12 07:24:27 -0300 | [diff] [blame] | 33 | #include <media/v4l2-i2c-drv.h> |
Hans Verkuil | 761dacd | 2007-10-30 05:41:25 -0300 | [diff] [blame] | 34 | |
| 35 | MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); |
| 36 | MODULE_AUTHOR("Hans Verkuil"); |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | |
Hans Verkuil | 761dacd | 2007-10-30 05:41:25 -0300 | [diff] [blame] | 39 | |
| 40 | struct m52790_state { |
| 41 | u16 input; |
| 42 | u16 output; |
| 43 | }; |
| 44 | |
| 45 | /* ----------------------------------------------------------------------- */ |
| 46 | |
| 47 | static int m52790_write(struct i2c_client *client) |
| 48 | { |
| 49 | struct m52790_state *state = i2c_get_clientdata(client); |
| 50 | u8 sw1 = (state->input | state->output) & 0xff; |
| 51 | u8 sw2 = (state->input | state->output) >> 8; |
| 52 | |
| 53 | return i2c_smbus_write_byte_data(client, sw1, sw2); |
| 54 | } |
| 55 | |
| 56 | static int m52790_command(struct i2c_client *client, unsigned int cmd, |
| 57 | void *arg) |
| 58 | { |
| 59 | struct m52790_state *state = i2c_get_clientdata(client); |
| 60 | struct v4l2_routing *route = arg; |
| 61 | |
| 62 | /* Note: audio and video are linked and cannot be switched separately. |
| 63 | So audio and video routing commands are identical for this chip. |
| 64 | In theory the video amplifier and audio modes could be handled |
| 65 | separately for the output, but that seems to be overkill right now. |
| 66 | The same holds for implementing an audio mute control, this is now |
| 67 | part of the audio output routing. The normal case is that another |
| 68 | chip takes care of the actual muting so making it part of the |
| 69 | output routing seems to be the right thing to do for now. */ |
| 70 | switch (cmd) { |
| 71 | case VIDIOC_INT_G_AUDIO_ROUTING: |
| 72 | case VIDIOC_INT_G_VIDEO_ROUTING: |
| 73 | route->input = state->input; |
| 74 | route->output = state->output; |
| 75 | break; |
| 76 | |
| 77 | case VIDIOC_INT_S_AUDIO_ROUTING: |
| 78 | case VIDIOC_INT_S_VIDEO_ROUTING: |
| 79 | state->input = route->input; |
| 80 | state->output = route->output; |
| 81 | m52790_write(client); |
| 82 | break; |
| 83 | |
| 84 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 85 | case VIDIOC_DBG_G_REGISTER: |
| 86 | case VIDIOC_DBG_S_REGISTER: |
| 87 | { |
| 88 | struct v4l2_register *reg = arg; |
| 89 | |
| 90 | if (!v4l2_chip_match_i2c_client(client, |
| 91 | reg->match_type, reg->match_chip)) |
| 92 | return -EINVAL; |
| 93 | if (!capable(CAP_SYS_ADMIN)) |
| 94 | return -EPERM; |
| 95 | if (reg->reg != 0) |
| 96 | return -EINVAL; |
| 97 | if (cmd == VIDIOC_DBG_G_REGISTER) |
| 98 | reg->val = state->input | state->output; |
| 99 | else { |
| 100 | state->input = reg->val & 0x0303; |
| 101 | state->output = reg->val & ~0x0303; |
| 102 | m52790_write(client); |
| 103 | } |
| 104 | break; |
| 105 | } |
| 106 | #endif |
| 107 | |
| 108 | case VIDIOC_G_CHIP_IDENT: |
| 109 | return v4l2_chip_ident_i2c_client(client, arg, |
| 110 | V4L2_IDENT_M52790, 0); |
| 111 | |
| 112 | case VIDIOC_LOG_STATUS: |
| 113 | v4l_info(client, "Switch 1: %02x\n", |
| 114 | (state->input | state->output) & 0xff); |
| 115 | v4l_info(client, "Switch 2: %02x\n", |
| 116 | (state->input | state->output) >> 8); |
| 117 | break; |
| 118 | |
| 119 | default: |
| 120 | return -EINVAL; |
| 121 | } |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | /* ----------------------------------------------------------------------- */ |
| 126 | |
| 127 | /* i2c implementation */ |
| 128 | |
| 129 | static int m52790_probe(struct i2c_client *client) |
| 130 | { |
| 131 | struct m52790_state *state; |
| 132 | |
| 133 | /* Check if the adapter supports the needed features */ |
| 134 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| 135 | return -EIO; |
| 136 | |
| 137 | snprintf(client->name, sizeof(client->name) - 1, "m52790"); |
| 138 | |
| 139 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
| 140 | client->addr << 1, client->adapter->name); |
| 141 | |
| 142 | state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); |
| 143 | if (state == NULL) |
| 144 | return -ENOMEM; |
| 145 | |
| 146 | state->input = M52790_IN_TUNER; |
| 147 | state->output = M52790_OUT_STEREO; |
| 148 | i2c_set_clientdata(client, state); |
| 149 | m52790_write(client); |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int m52790_remove(struct i2c_client *client) |
| 154 | { |
| 155 | kfree(i2c_get_clientdata(client)); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | /* ----------------------------------------------------------------------- */ |
| 160 | |
| 161 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
| 162 | .name = "m52790", |
| 163 | .driverid = I2C_DRIVERID_M52790, |
| 164 | .command = m52790_command, |
| 165 | .probe = m52790_probe, |
| 166 | .remove = m52790_remove, |
| 167 | }; |
| 168 | |