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 #include <media/v4l2-chip-ident.h> 35 36 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 37 MODULE_DESCRIPTION("tda9840 driver"); 38 MODULE_LICENSE("GPL"); 39 40 static int debug; 41 module_param(debug, int, 0644); 42 43 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 44 45 #define SWITCH 0x00 46 #define LEVEL_ADJUST 0x02 47 #define STEREO_ADJUST 0x03 48 #define TEST 0x04 49 50 #define TDA9840_SET_MUTE 0x00 51 #define TDA9840_SET_MONO 0x10 52 #define TDA9840_SET_STEREO 0x2a 53 #define TDA9840_SET_LANG1 0x12 54 #define TDA9840_SET_LANG2 0x1e 55 #define TDA9840_SET_BOTH 0x1a 56 #define TDA9840_SET_BOTH_R 0x16 57 #define TDA9840_SET_EXTERNAL 0x7a 58 59 60 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) 61 { 62 struct i2c_client *client = v4l2_get_subdevdata(sd); 63 64 if (i2c_smbus_write_byte_data(client, reg, val)) 65 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", 66 val, reg); 67 } 68 69 static int tda9840_status(struct v4l2_subdev *sd) 70 { 71 struct i2c_client *client = v4l2_get_subdevdata(sd); 72 u8 byte; 73 74 if (1 != i2c_master_recv(client, &byte, 1)) { 75 v4l2_dbg(1, debug, sd, 76 "i2c_master_recv() failed\n"); 77 return -EIO; 78 } 79 80 if (byte & 0x80) { 81 v4l2_dbg(1, debug, sd, 82 "TDA9840_DETECT: register contents invalid\n"); 83 return -EINVAL; 84 } 85 86 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); 87 return byte & 0x60; 88 } 89 90 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 91 { 92 int stat = tda9840_status(sd); 93 int byte; 94 95 if (t->index) 96 return -EINVAL; 97 98 stat = stat < 0 ? 0 : stat; 99 if (stat == 0 || stat == 0x60) /* mono input */ 100 byte = TDA9840_SET_MONO; 101 else if (stat == 0x40) /* stereo input */ 102 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? 103 TDA9840_SET_MONO : TDA9840_SET_STEREO; 104 else { /* bilingual */ 105 switch (t->audmode) { 106 case V4L2_TUNER_MODE_LANG1_LANG2: 107 byte = TDA9840_SET_BOTH; 108 break; 109 case V4L2_TUNER_MODE_LANG2: 110 byte = TDA9840_SET_LANG2; 111 break; 112 default: 113 byte = TDA9840_SET_LANG1; 114 break; 115 } 116 } 117 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); 118 tda9840_write(sd, SWITCH, byte); 119 return 0; 120 } 121 122 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 123 { 124 int stat = tda9840_status(sd); 125 126 if (stat < 0) 127 return stat; 128 129 t->rxsubchans = V4L2_TUNER_SUB_MONO; 130 131 switch (stat & 0x60) { 132 case 0x00: 133 t->rxsubchans = V4L2_TUNER_SUB_MONO; 134 break; 135 case 0x20: 136 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; 137 break; 138 case 0x40: 139 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; 140 break; 141 default: /* Incorrect detect */ 142 t->rxsubchans = V4L2_TUNER_MODE_MONO; 143 break; 144 } 145 return 0; 146 } 147 148 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 149 { 150 struct i2c_client *client = v4l2_get_subdevdata(sd); 151 152 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0); 153 } 154 155 /* ----------------------------------------------------------------------- */ 156 157 static const struct v4l2_subdev_core_ops tda9840_core_ops = { 158 .g_chip_ident = tda9840_g_chip_ident, 159 }; 160 161 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { 162 .s_tuner = tda9840_s_tuner, 163 .g_tuner = tda9840_g_tuner, 164 }; 165 166 static const struct v4l2_subdev_ops tda9840_ops = { 167 .core = &tda9840_core_ops, 168 .tuner = &tda9840_tuner_ops, 169 }; 170 171 /* ----------------------------------------------------------------------- */ 172 173 static int tda9840_probe(struct i2c_client *client, 174 const struct i2c_device_id *id) 175 { 176 struct v4l2_subdev *sd; 177 178 /* let's see whether this adapter can support what we need */ 179 if (!i2c_check_functionality(client->adapter, 180 I2C_FUNC_SMBUS_READ_BYTE_DATA | 181 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) 182 return -EIO; 183 184 v4l_info(client, "chip found @ 0x%x (%s)\n", 185 client->addr << 1, client->adapter->name); 186 187 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); 188 if (sd == NULL) 189 return -ENOMEM; 190 v4l2_i2c_subdev_init(sd, client, &tda9840_ops); 191 192 /* set initial values for level & stereo - adjustment, mode */ 193 tda9840_write(sd, LEVEL_ADJUST, 0); 194 tda9840_write(sd, STEREO_ADJUST, 0); 195 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); 196 return 0; 197 } 198 199 static int tda9840_remove(struct i2c_client *client) 200 { 201 struct v4l2_subdev *sd = i2c_get_clientdata(client); 202 203 v4l2_device_unregister_subdev(sd); 204 kfree(sd); 205 return 0; 206 } 207 208 static const struct i2c_device_id tda9840_id[] = { 209 { "tda9840", 0 }, 210 { } 211 }; 212 MODULE_DEVICE_TABLE(i2c, tda9840_id); 213 214 static struct i2c_driver tda9840_driver = { 215 .driver = { 216 .owner = THIS_MODULE, 217 .name = "tda9840", 218 }, 219 .probe = tda9840_probe, 220 .remove = tda9840_remove, 221 .id_table = tda9840_id, 222 }; 223 224 module_i2c_driver(tda9840_driver); 225