1 /* 2 tda9840 - i2c-driver for the tda9840 by SGS Thomson 3 4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> 5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> 6 7 The tda9840 is a stereo/dual sound processor with digital 8 identification. It can be found at address 0x84 on the i2c-bus. 9 10 For detailed informations download the specifications directly 11 from SGS Thomson at http://www.st.com 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 29 #include <linux/module.h> 30 #include <linux/ioctl.h> 31 #include <linux/slab.h> 32 #include <linux/i2c.h> 33 #include <media/v4l2-device.h> 34 35 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 36 MODULE_DESCRIPTION("tda9840 driver"); 37 MODULE_LICENSE("GPL"); 38 39 static int debug; 40 module_param(debug, int, 0644); 41 42 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 43 44 #define SWITCH 0x00 45 #define LEVEL_ADJUST 0x02 46 #define STEREO_ADJUST 0x03 47 #define TEST 0x04 48 49 #define TDA9840_SET_MUTE 0x00 50 #define TDA9840_SET_MONO 0x10 51 #define TDA9840_SET_STEREO 0x2a 52 #define TDA9840_SET_LANG1 0x12 53 #define TDA9840_SET_LANG2 0x1e 54 #define TDA9840_SET_BOTH 0x1a 55 #define TDA9840_SET_BOTH_R 0x16 56 #define TDA9840_SET_EXTERNAL 0x7a 57 58 59 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) 60 { 61 struct i2c_client *client = v4l2_get_subdevdata(sd); 62 63 if (i2c_smbus_write_byte_data(client, reg, val)) 64 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", 65 val, reg); 66 } 67 68 static int tda9840_status(struct v4l2_subdev *sd) 69 { 70 struct i2c_client *client = v4l2_get_subdevdata(sd); 71 int rc; 72 u8 byte; 73 74 rc = i2c_master_recv(client, &byte, 1); 75 if (rc != 1) { 76 v4l2_dbg(1, debug, sd, 77 "i2c_master_recv() failed\n"); 78 if (rc < 0) 79 return rc; 80 return -EIO; 81 } 82 83 if (byte & 0x80) { 84 v4l2_dbg(1, debug, sd, 85 "TDA9840_DETECT: register contents invalid\n"); 86 return -EINVAL; 87 } 88 89 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); 90 return byte & 0x60; 91 } 92 93 static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) 94 { 95 int stat = tda9840_status(sd); 96 int byte; 97 98 if (t->index) 99 return -EINVAL; 100 101 stat = stat < 0 ? 0 : stat; 102 if (stat == 0 || stat == 0x60) /* mono input */ 103 byte = TDA9840_SET_MONO; 104 else if (stat == 0x40) /* stereo input */ 105 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? 106 TDA9840_SET_MONO : TDA9840_SET_STEREO; 107 else { /* bilingual */ 108 switch (t->audmode) { 109 case V4L2_TUNER_MODE_LANG1_LANG2: 110 byte = TDA9840_SET_BOTH; 111 break; 112 case V4L2_TUNER_MODE_LANG2: 113 byte = TDA9840_SET_LANG2; 114 break; 115 default: 116 byte = TDA9840_SET_LANG1; 117 break; 118 } 119 } 120 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); 121 tda9840_write(sd, SWITCH, byte); 122 return 0; 123 } 124 125 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 126 { 127 int stat = tda9840_status(sd); 128 129 if (stat < 0) 130 return stat; 131 132 t->rxsubchans = V4L2_TUNER_SUB_MONO; 133 134 switch (stat & 0x60) { 135 case 0x00: 136 t->rxsubchans = V4L2_TUNER_SUB_MONO; 137 break; 138 case 0x20: 139 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; 140 break; 141 case 0x40: 142 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; 143 break; 144 default: /* Incorrect detect */ 145 t->rxsubchans = V4L2_TUNER_MODE_MONO; 146 break; 147 } 148 return 0; 149 } 150 151 /* ----------------------------------------------------------------------- */ 152 153 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { 154 .s_tuner = tda9840_s_tuner, 155 .g_tuner = tda9840_g_tuner, 156 }; 157 158 static const struct v4l2_subdev_ops tda9840_ops = { 159 .tuner = &tda9840_tuner_ops, 160 }; 161 162 /* ----------------------------------------------------------------------- */ 163 164 static int tda9840_probe(struct i2c_client *client, 165 const struct i2c_device_id *id) 166 { 167 struct v4l2_subdev *sd; 168 169 /* let's see whether this adapter can support what we need */ 170 if (!i2c_check_functionality(client->adapter, 171 I2C_FUNC_SMBUS_READ_BYTE_DATA | 172 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) 173 return -EIO; 174 175 v4l_info(client, "chip found @ 0x%x (%s)\n", 176 client->addr << 1, client->adapter->name); 177 178 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 179 if (sd == NULL) 180 return -ENOMEM; 181 v4l2_i2c_subdev_init(sd, client, &tda9840_ops); 182 183 /* set initial values for level & stereo - adjustment, mode */ 184 tda9840_write(sd, LEVEL_ADJUST, 0); 185 tda9840_write(sd, STEREO_ADJUST, 0); 186 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); 187 return 0; 188 } 189 190 static int tda9840_remove(struct i2c_client *client) 191 { 192 struct v4l2_subdev *sd = i2c_get_clientdata(client); 193 194 v4l2_device_unregister_subdev(sd); 195 return 0; 196 } 197 198 static const struct i2c_device_id tda9840_id[] = { 199 { "tda9840", 0 }, 200 { } 201 }; 202 MODULE_DEVICE_TABLE(i2c, tda9840_id); 203 204 static struct i2c_driver tda9840_driver = { 205 .driver = { 206 .name = "tda9840", 207 }, 208 .probe = tda9840_probe, 209 .remove = tda9840_remove, 210 .id_table = tda9840_id, 211 }; 212 213 module_i2c_driver(tda9840_driver); 214