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/i2c-id.h> 30#include <linux/videodev2.h> 31#include <media/m52790.h> 32#include <media/v4l2-device.h> 33#include <media/v4l2-chip-ident.h> 34#include <media/v4l2-i2c-drv.h> 35 36MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); 37MODULE_AUTHOR("Hans Verkuil"); 38MODULE_LICENSE("GPL"); 39 40 41struct m52790_state { 42 struct v4l2_subdev sd; 43 u16 input; 44 u16 output; 45}; 46 47static inline struct m52790_state *to_state(struct v4l2_subdev *sd) 48{ 49 return container_of(sd, struct m52790_state, sd); 50} 51 52/* ----------------------------------------------------------------------- */ 53 54static int m52790_write(struct v4l2_subdev *sd) 55{ 56 struct m52790_state *state = to_state(sd); 57 struct i2c_client *client = v4l2_get_subdevdata(sd); 58 59 u8 sw1 = (state->input | state->output) & 0xff; 60 u8 sw2 = (state->input | state->output) >> 8; 61 62 return i2c_smbus_write_byte_data(client, sw1, sw2); 63} 64 65/* Note: audio and video are linked and cannot be switched separately. 66 So audio and video routing commands are identical for this chip. 67 In theory the video amplifier and audio modes could be handled 68 separately for the output, but that seems to be overkill right now. 69 The same holds for implementing an audio mute control, this is now 70 part of the audio output routing. The normal case is that another 71 chip takes care of the actual muting so making it part of the 72 output routing seems to be the right thing to do for now. */ 73static int m52790_s_routing(struct v4l2_subdev *sd, 74 u32 input, u32 output, u32 config) 75{ 76 struct m52790_state *state = to_state(sd); 77 78 state->input = input; 79 state->output = output; 80 m52790_write(sd); 81 return 0; 82} 83 84#ifdef CONFIG_VIDEO_ADV_DEBUG 85static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 86{ 87 struct m52790_state *state = to_state(sd); 88 struct i2c_client *client = v4l2_get_subdevdata(sd); 89 90 if (!v4l2_chip_match_i2c_client(client, ®->match)) 91 return -EINVAL; 92 if (!capable(CAP_SYS_ADMIN)) 93 return -EPERM; 94 if (reg->reg != 0) 95 return -EINVAL; 96 reg->size = 1; 97 reg->val = state->input | state->output; 98 return 0; 99} 100 101static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) 102{ 103 struct m52790_state *state = to_state(sd); 104 struct i2c_client *client = v4l2_get_subdevdata(sd); 105 106 if (!v4l2_chip_match_i2c_client(client, ®->match)) 107 return -EINVAL; 108 if (!capable(CAP_SYS_ADMIN)) 109 return -EPERM; 110 if (reg->reg != 0) 111 return -EINVAL; 112 state->input = reg->val & 0x0303; 113 state->output = reg->val & ~0x0303; 114 m52790_write(sd); 115 return 0; 116} 117#endif 118 119static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 120{ 121 struct i2c_client *client = v4l2_get_subdevdata(sd); 122 123 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); 124} 125 126static int m52790_log_status(struct v4l2_subdev *sd) 127{ 128 struct m52790_state *state = to_state(sd); 129 130 v4l2_info(sd, "Switch 1: %02x\n", 131 (state->input | state->output) & 0xff); 132 v4l2_info(sd, "Switch 2: %02x\n", 133 (state->input | state->output) >> 8); 134 return 0; 135} 136 137/* ----------------------------------------------------------------------- */ 138 139static const struct v4l2_subdev_core_ops m52790_core_ops = { 140 .log_status = m52790_log_status, 141 .g_chip_ident = m52790_g_chip_ident, 142#ifdef CONFIG_VIDEO_ADV_DEBUG 143 .g_register = m52790_g_register, 144 .s_register = m52790_s_register, 145#endif 146}; 147 148static const struct v4l2_subdev_audio_ops m52790_audio_ops = { 149 .s_routing = m52790_s_routing, 150}; 151 152static const struct v4l2_subdev_video_ops m52790_video_ops = { 153 .s_routing = m52790_s_routing, 154}; 155 156static const struct v4l2_subdev_ops m52790_ops = { 157 .core = &m52790_core_ops, 158 .audio = &m52790_audio_ops, 159 .video = &m52790_video_ops, 160}; 161 162/* ----------------------------------------------------------------------- */ 163 164/* i2c implementation */ 165 166static int m52790_probe(struct i2c_client *client, 167 const struct i2c_device_id *id) 168{ 169 struct m52790_state *state; 170 struct v4l2_subdev *sd; 171 172 /* Check if the adapter supports the needed features */ 173 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 174 return -EIO; 175 176 v4l_info(client, "chip found @ 0x%x (%s)\n", 177 client->addr << 1, client->adapter->name); 178 179 state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); 180 if (state == NULL) 181 return -ENOMEM; 182 183 sd = &state->sd; 184 v4l2_i2c_subdev_init(sd, client, &m52790_ops); 185 state->input = M52790_IN_TUNER; 186 state->output = M52790_OUT_STEREO; 187 m52790_write(sd); 188 return 0; 189} 190 191static int m52790_remove(struct i2c_client *client) 192{ 193 struct v4l2_subdev *sd = i2c_get_clientdata(client); 194 195 v4l2_device_unregister_subdev(sd); 196 kfree(to_state(sd)); 197 return 0; 198} 199 200/* ----------------------------------------------------------------------- */ 201 202static const struct i2c_device_id m52790_id[] = { 203 { "m52790", 0 }, 204 { } 205}; 206MODULE_DEVICE_TABLE(i2c, m52790_id); 207 208static struct v4l2_i2c_driver_data v4l2_i2c_data = { 209 .name = "m52790", 210 .probe = m52790_probe, 211 .remove = m52790_remove, 212 .id_table = m52790_id, 213}; 214