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/slab.h> 26 #include <linux/ioctl.h> 27 #include <asm/uaccess.h> 28 #include <linux/i2c.h> 29 #include <linux/videodev2.h> 30 #include <media/m52790.h> 31 #include <media/v4l2-device.h> 32 33 MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); 34 MODULE_AUTHOR("Hans Verkuil"); 35 MODULE_LICENSE("GPL"); 36 37 38 struct m52790_state { 39 struct v4l2_subdev sd; 40 u16 input; 41 u16 output; 42 }; 43 44 static inline struct m52790_state *to_state(struct v4l2_subdev *sd) 45 { 46 return container_of(sd, struct m52790_state, sd); 47 } 48 49 /* ----------------------------------------------------------------------- */ 50 51 static int m52790_write(struct v4l2_subdev *sd) 52 { 53 struct m52790_state *state = to_state(sd); 54 struct i2c_client *client = v4l2_get_subdevdata(sd); 55 56 u8 sw1 = (state->input | state->output) & 0xff; 57 u8 sw2 = (state->input | state->output) >> 8; 58 59 return i2c_smbus_write_byte_data(client, sw1, sw2); 60 } 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 static int m52790_s_routing(struct v4l2_subdev *sd, 71 u32 input, u32 output, u32 config) 72 { 73 struct m52790_state *state = to_state(sd); 74 75 state->input = input; 76 state->output = output; 77 m52790_write(sd); 78 return 0; 79 } 80 81 #ifdef CONFIG_VIDEO_ADV_DEBUG 82 static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 83 { 84 struct m52790_state *state = to_state(sd); 85 86 if (reg->reg != 0) 87 return -EINVAL; 88 reg->size = 1; 89 reg->val = state->input | state->output; 90 return 0; 91 } 92 93 static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) 94 { 95 struct m52790_state *state = to_state(sd); 96 97 if (reg->reg != 0) 98 return -EINVAL; 99 state->input = reg->val & 0x0303; 100 state->output = reg->val & ~0x0303; 101 m52790_write(sd); 102 return 0; 103 } 104 #endif 105 106 static int m52790_log_status(struct v4l2_subdev *sd) 107 { 108 struct m52790_state *state = to_state(sd); 109 110 v4l2_info(sd, "Switch 1: %02x\n", 111 (state->input | state->output) & 0xff); 112 v4l2_info(sd, "Switch 2: %02x\n", 113 (state->input | state->output) >> 8); 114 return 0; 115 } 116 117 /* ----------------------------------------------------------------------- */ 118 119 static const struct v4l2_subdev_core_ops m52790_core_ops = { 120 .log_status = m52790_log_status, 121 #ifdef CONFIG_VIDEO_ADV_DEBUG 122 .g_register = m52790_g_register, 123 .s_register = m52790_s_register, 124 #endif 125 }; 126 127 static const struct v4l2_subdev_audio_ops m52790_audio_ops = { 128 .s_routing = m52790_s_routing, 129 }; 130 131 static const struct v4l2_subdev_video_ops m52790_video_ops = { 132 .s_routing = m52790_s_routing, 133 }; 134 135 static const struct v4l2_subdev_ops m52790_ops = { 136 .core = &m52790_core_ops, 137 .audio = &m52790_audio_ops, 138 .video = &m52790_video_ops, 139 }; 140 141 /* ----------------------------------------------------------------------- */ 142 143 /* i2c implementation */ 144 145 static int m52790_probe(struct i2c_client *client, 146 const struct i2c_device_id *id) 147 { 148 struct m52790_state *state; 149 struct v4l2_subdev *sd; 150 151 /* Check if the adapter supports the needed features */ 152 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 153 return -EIO; 154 155 v4l_info(client, "chip found @ 0x%x (%s)\n", 156 client->addr << 1, client->adapter->name); 157 158 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 159 if (state == NULL) 160 return -ENOMEM; 161 162 sd = &state->sd; 163 v4l2_i2c_subdev_init(sd, client, &m52790_ops); 164 state->input = M52790_IN_TUNER; 165 state->output = M52790_OUT_STEREO; 166 m52790_write(sd); 167 return 0; 168 } 169 170 static int m52790_remove(struct i2c_client *client) 171 { 172 struct v4l2_subdev *sd = i2c_get_clientdata(client); 173 174 v4l2_device_unregister_subdev(sd); 175 return 0; 176 } 177 178 /* ----------------------------------------------------------------------- */ 179 180 static const struct i2c_device_id m52790_id[] = { 181 { "m52790", 0 }, 182 { } 183 }; 184 MODULE_DEVICE_TABLE(i2c, m52790_id); 185 186 static struct i2c_driver m52790_driver = { 187 .driver = { 188 .name = "m52790", 189 }, 190 .probe = m52790_probe, 191 .remove = m52790_remove, 192 .id_table = m52790_id, 193 }; 194 195 module_i2c_driver(m52790_driver); 196