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 (!capable(CAP_SYS_ADMIN)) 91 return -EPERM; 92 if (reg->reg != 0) 93 return -EINVAL; 94 reg->size = 1; 95 reg->val = state->input | state->output; 96 return 0; 97 } 98 99 static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 100 { 101 struct m52790_state *state = to_state(sd); 102 struct i2c_client *client = v4l2_get_subdevdata(sd); 103 104 if (!v4l2_chip_match_i2c_client(client, ®->match)) 105 return -EINVAL; 106 if (!capable(CAP_SYS_ADMIN)) 107 return -EPERM; 108 if (reg->reg != 0) 109 return -EINVAL; 110 state->input = reg->val & 0x0303; 111 state->output = reg->val & ~0x0303; 112 m52790_write(sd); 113 return 0; 114 } 115 #endif 116 117 static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 118 { 119 struct i2c_client *client = v4l2_get_subdevdata(sd); 120 121 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); 122 } 123 124 static int m52790_log_status(struct v4l2_subdev *sd) 125 { 126 struct m52790_state *state = to_state(sd); 127 128 v4l2_info(sd, "Switch 1: %02x\n", 129 (state->input | state->output) & 0xff); 130 v4l2_info(sd, "Switch 2: %02x\n", 131 (state->input | state->output) >> 8); 132 return 0; 133 } 134 135 /* ----------------------------------------------------------------------- */ 136 137 static const struct v4l2_subdev_core_ops m52790_core_ops = { 138 .log_status = m52790_log_status, 139 .g_chip_ident = m52790_g_chip_ident, 140 #ifdef CONFIG_VIDEO_ADV_DEBUG 141 .g_register = m52790_g_register, 142 .s_register = m52790_s_register, 143 #endif 144 }; 145 146 static const struct v4l2_subdev_audio_ops m52790_audio_ops = { 147 .s_routing = m52790_s_routing, 148 }; 149 150 static const struct v4l2_subdev_video_ops m52790_video_ops = { 151 .s_routing = m52790_s_routing, 152 }; 153 154 static const struct v4l2_subdev_ops m52790_ops = { 155 .core = &m52790_core_ops, 156 .audio = &m52790_audio_ops, 157 .video = &m52790_video_ops, 158 }; 159 160 /* ----------------------------------------------------------------------- */ 161 162 /* i2c implementation */ 163 164 static int m52790_probe(struct i2c_client *client, 165 const struct i2c_device_id *id) 166 { 167 struct m52790_state *state; 168 struct v4l2_subdev *sd; 169 170 /* Check if the adapter supports the needed features */ 171 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 172 return -EIO; 173 174 v4l_info(client, "chip found @ 0x%x (%s)\n", 175 client->addr << 1, client->adapter->name); 176 177 state = kzalloc(sizeof(struct m52790_state), GFP_KERNEL); 178 if (state == NULL) 179 return -ENOMEM; 180 181 sd = &state->sd; 182 v4l2_i2c_subdev_init(sd, client, &m52790_ops); 183 state->input = M52790_IN_TUNER; 184 state->output = M52790_OUT_STEREO; 185 m52790_write(sd); 186 return 0; 187 } 188 189 static int m52790_remove(struct i2c_client *client) 190 { 191 struct v4l2_subdev *sd = i2c_get_clientdata(client); 192 193 v4l2_device_unregister_subdev(sd); 194 kfree(to_state(sd)); 195 return 0; 196 } 197 198 /* ----------------------------------------------------------------------- */ 199 200 static const struct i2c_device_id m52790_id[] = { 201 { "m52790", 0 }, 202 { } 203 }; 204 MODULE_DEVICE_TABLE(i2c, m52790_id); 205 206 static struct i2c_driver m52790_driver = { 207 .driver = { 208 .owner = THIS_MODULE, 209 .name = "m52790", 210 }, 211 .probe = m52790_probe, 212 .remove = m52790_remove, 213 .id_table = m52790_id, 214 }; 215 216 module_i2c_driver(m52790_driver); 217