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 #include <media/v4l2-chip-ident.h> 33 34 MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); 35 MODULE_AUTHOR("Hans Verkuil"); 36 MODULE_LICENSE("GPL"); 37 38 39 struct m52790_state { 40 struct v4l2_subdev sd; 41 u16 input; 42 u16 output; 43 }; 44 45 static inline struct m52790_state *to_state(struct v4l2_subdev *sd) 46 { 47 return container_of(sd, struct m52790_state, sd); 48 } 49 50 /* ----------------------------------------------------------------------- */ 51 52 static int m52790_write(struct v4l2_subdev *sd) 53 { 54 struct m52790_state *state = to_state(sd); 55 struct i2c_client *client = v4l2_get_subdevdata(sd); 56 57 u8 sw1 = (state->input | state->output) & 0xff; 58 u8 sw2 = (state->input | state->output) >> 8; 59 60 return i2c_smbus_write_byte_data(client, sw1, sw2); 61 } 62 63 /* Note: audio and video are linked and cannot be switched separately. 64 So audio and video routing commands are identical for this chip. 65 In theory the video amplifier and audio modes could be handled 66 separately for the output, but that seems to be overkill right now. 67 The same holds for implementing an audio mute control, this is now 68 part of the audio output routing. The normal case is that another 69 chip takes care of the actual muting so making it part of the 70 output routing seems to be the right thing to do for now. */ 71 static int m52790_s_routing(struct v4l2_subdev *sd, 72 u32 input, u32 output, u32 config) 73 { 74 struct m52790_state *state = to_state(sd); 75 76 state->input = input; 77 state->output = output; 78 m52790_write(sd); 79 return 0; 80 } 81 82 #ifdef CONFIG_VIDEO_ADV_DEBUG 83 static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 84 { 85 struct m52790_state *state = to_state(sd); 86 struct i2c_client *client = v4l2_get_subdevdata(sd); 87 88 if (!v4l2_chip_match_i2c_client(client, ®->match)) 89 return -EINVAL; 90 if (reg->reg != 0) 91 return -EINVAL; 92 reg->size = 1; 93 reg->val = state->input | state->output; 94 return 0; 95 } 96 97 static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) 98 { 99 struct m52790_state *state = to_state(sd); 100 struct i2c_client *client = v4l2_get_subdevdata(sd); 101 102 if (!v4l2_chip_match_i2c_client(client, ®->match)) 103 return -EINVAL; 104 if (reg->reg != 0) 105 return -EINVAL; 106 state->input = reg->val & 0x0303; 107 state->output = reg->val & ~0x0303; 108 m52790_write(sd); 109 return 0; 110 } 111 #endif 112 113 static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 114 { 115 struct i2c_client *client = v4l2_get_subdevdata(sd); 116 117 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); 118 } 119 120 static int m52790_log_status(struct v4l2_subdev *sd) 121 { 122 struct m52790_state *state = to_state(sd); 123 124 v4l2_info(sd, "Switch 1: %02x\n", 125 (state->input | state->output) & 0xff); 126 v4l2_info(sd, "Switch 2: %02x\n", 127 (state->input | state->output) >> 8); 128 return 0; 129 } 130 131 /* ----------------------------------------------------------------------- */ 132 133 static const struct v4l2_subdev_core_ops m52790_core_ops = { 134 .log_status = m52790_log_status, 135 .g_chip_ident = m52790_g_chip_ident, 136 #ifdef CONFIG_VIDEO_ADV_DEBUG 137 .g_register = m52790_g_register, 138 .s_register = m52790_s_register, 139 #endif 140 }; 141 142 static const struct v4l2_subdev_audio_ops m52790_audio_ops = { 143 .s_routing = m52790_s_routing, 144 }; 145 146 static const struct v4l2_subdev_video_ops m52790_video_ops = { 147 .s_routing = m52790_s_routing, 148 }; 149 150 static const struct v4l2_subdev_ops m52790_ops = { 151 .core = &m52790_core_ops, 152 .audio = &m52790_audio_ops, 153 .video = &m52790_video_ops, 154 }; 155 156 /* ----------------------------------------------------------------------- */ 157 158 /* i2c implementation */ 159 160 static int m52790_probe(struct i2c_client *client, 161 const struct i2c_device_id *id) 162 { 163 struct m52790_state *state; 164 struct v4l2_subdev *sd; 165 166 /* Check if the adapter supports the needed features */ 167 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 168 return -EIO; 169 170 v4l_info(client, "chip found @ 0x%x (%s)\n", 171 client->addr << 1, client->adapter->name); 172 173 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 174 if (state == NULL) 175 return -ENOMEM; 176 177 sd = &state->sd; 178 v4l2_i2c_subdev_init(sd, client, &m52790_ops); 179 state->input = M52790_IN_TUNER; 180 state->output = M52790_OUT_STEREO; 181 m52790_write(sd); 182 return 0; 183 } 184 185 static int m52790_remove(struct i2c_client *client) 186 { 187 struct v4l2_subdev *sd = i2c_get_clientdata(client); 188 189 v4l2_device_unregister_subdev(sd); 190 return 0; 191 } 192 193 /* ----------------------------------------------------------------------- */ 194 195 static const struct i2c_device_id m52790_id[] = { 196 { "m52790", 0 }, 197 { } 198 }; 199 MODULE_DEVICE_TABLE(i2c, m52790_id); 200 201 static struct i2c_driver m52790_driver = { 202 .driver = { 203 .owner = THIS_MODULE, 204 .name = "m52790", 205 }, 206 .probe = m52790_probe, 207 .remove = m52790_remove, 208 .id_table = m52790_id, 209 }; 210 211 module_i2c_driver(m52790_driver); 212