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 u8 byte; 72 73 if (1 != i2c_master_recv(client, &byte, 1)) { 74 v4l2_dbg(1, debug, sd, 75 "i2c_master_recv() failed\n"); 76 return -EIO; 77 } 78 79 if (byte & 0x80) { 80 v4l2_dbg(1, debug, sd, 81 "TDA9840_DETECT: register contents invalid\n"); 82 return -EINVAL; 83 } 84 85 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); 86 return byte & 0x60; 87 } 88 89 static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) 90 { 91 int stat = tda9840_status(sd); 92 int byte; 93 94 if (t->index) 95 return -EINVAL; 96 97 stat = stat < 0 ? 0 : stat; 98 if (stat == 0 || stat == 0x60) /* mono input */ 99 byte = TDA9840_SET_MONO; 100 else if (stat == 0x40) /* stereo input */ 101 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? 102 TDA9840_SET_MONO : TDA9840_SET_STEREO; 103 else { /* bilingual */ 104 switch (t->audmode) { 105 case V4L2_TUNER_MODE_LANG1_LANG2: 106 byte = TDA9840_SET_BOTH; 107 break; 108 case V4L2_TUNER_MODE_LANG2: 109 byte = TDA9840_SET_LANG2; 110 break; 111 default: 112 byte = TDA9840_SET_LANG1; 113 break; 114 } 115 } 116 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); 117 tda9840_write(sd, SWITCH, byte); 118 return 0; 119 } 120 121 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 122 { 123 int stat = tda9840_status(sd); 124 125 if (stat < 0) 126 return stat; 127 128 t->rxsubchans = V4L2_TUNER_SUB_MONO; 129 130 switch (stat & 0x60) { 131 case 0x00: 132 t->rxsubchans = V4L2_TUNER_SUB_MONO; 133 break; 134 case 0x20: 135 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; 136 break; 137 case 0x40: 138 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; 139 break; 140 default: /* Incorrect detect */ 141 t->rxsubchans = V4L2_TUNER_MODE_MONO; 142 break; 143 } 144 return 0; 145 } 146 147 /* ----------------------------------------------------------------------- */ 148 149 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { 150 .s_tuner = tda9840_s_tuner, 151 .g_tuner = tda9840_g_tuner, 152 }; 153 154 static const struct v4l2_subdev_ops tda9840_ops = { 155 .tuner = &tda9840_tuner_ops, 156 }; 157 158 /* ----------------------------------------------------------------------- */ 159 160 static int tda9840_probe(struct i2c_client *client, 161 const struct i2c_device_id *id) 162 { 163 struct v4l2_subdev *sd; 164 165 /* let's see whether this adapter can support what we need */ 166 if (!i2c_check_functionality(client->adapter, 167 I2C_FUNC_SMBUS_READ_BYTE_DATA | 168 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) 169 return -EIO; 170 171 v4l_info(client, "chip found @ 0x%x (%s)\n", 172 client->addr << 1, client->adapter->name); 173 174 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 175 if (sd == NULL) 176 return -ENOMEM; 177 v4l2_i2c_subdev_init(sd, client, &tda9840_ops); 178 179 /* set initial values for level & stereo - adjustment, mode */ 180 tda9840_write(sd, LEVEL_ADJUST, 0); 181 tda9840_write(sd, STEREO_ADJUST, 0); 182 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); 183 return 0; 184 } 185 186 static int tda9840_remove(struct i2c_client *client) 187 { 188 struct v4l2_subdev *sd = i2c_get_clientdata(client); 189 190 v4l2_device_unregister_subdev(sd); 191 return 0; 192 } 193 194 static const struct i2c_device_id tda9840_id[] = { 195 { "tda9840", 0 }, 196 { } 197 }; 198 MODULE_DEVICE_TABLE(i2c, tda9840_id); 199 200 static struct i2c_driver tda9840_driver = { 201 .driver = { 202 .owner = THIS_MODULE, 203 .name = "tda9840", 204 }, 205 .probe = tda9840_probe, 206 .remove = tda9840_remove, 207 .id_table = tda9840_id, 208 }; 209 210 module_i2c_driver(tda9840_driver); 211