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 36MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 37MODULE_DESCRIPTION("tda9840 driver"); 38MODULE_LICENSE("GPL"); 39 40static int debug; 41module_param(debug, int, 0644); 42 43MODULE_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 60static 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 69static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 70{ 71 int byte; 72 73 if (t->index) 74 return -EINVAL; 75 76 switch (t->audmode) { 77 case V4L2_TUNER_MODE_STEREO: 78 byte = TDA9840_SET_STEREO; 79 break; 80 case V4L2_TUNER_MODE_LANG1_LANG2: 81 byte = TDA9840_SET_BOTH; 82 break; 83 case V4L2_TUNER_MODE_LANG1: 84 byte = TDA9840_SET_LANG1; 85 break; 86 case V4L2_TUNER_MODE_LANG2: 87 byte = TDA9840_SET_LANG2; 88 break; 89 default: 90 byte = TDA9840_SET_MONO; 91 break; 92 } 93 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); 94 tda9840_write(sd, SWITCH, byte); 95 return 0; 96} 97 98static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 99{ 100 struct i2c_client *client = v4l2_get_subdevdata(sd); 101 u8 byte; 102 103 t->rxsubchans = V4L2_TUNER_SUB_MONO; 104 if (1 != i2c_master_recv(client, &byte, 1)) { 105 v4l2_dbg(1, debug, sd, 106 "i2c_master_recv() failed\n"); 107 return -EIO; 108 } 109 110 if (byte & 0x80) { 111 v4l2_dbg(1, debug, sd, 112 "TDA9840_DETECT: register contents invalid\n"); 113 return -EINVAL; 114 } 115 116 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); 117 118 switch (byte & 0x60) { 119 case 0x00: 120 t->rxsubchans = V4L2_TUNER_SUB_MONO; 121 break; 122 case 0x20: 123 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; 124 break; 125 case 0x40: 126 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; 127 break; 128 default: /* Incorrect detect */ 129 t->rxsubchans = V4L2_TUNER_MODE_MONO; 130 break; 131 } 132 return 0; 133} 134 135static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 136{ 137 struct i2c_client *client = v4l2_get_subdevdata(sd); 138 139 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0); 140} 141 142/* ----------------------------------------------------------------------- */ 143 144static const struct v4l2_subdev_core_ops tda9840_core_ops = { 145 .g_chip_ident = tda9840_g_chip_ident, 146}; 147 148static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { 149 .s_tuner = tda9840_s_tuner, 150 .g_tuner = tda9840_g_tuner, 151}; 152 153static const struct v4l2_subdev_ops tda9840_ops = { 154 .core = &tda9840_core_ops, 155 .tuner = &tda9840_tuner_ops, 156}; 157 158/* ----------------------------------------------------------------------- */ 159 160static 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 = kzalloc(sizeof(struct v4l2_subdev), 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 186static 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 kfree(sd); 192 return 0; 193} 194 195static const struct i2c_device_id tda9840_id[] = { 196 { "tda9840", 0 }, 197 { } 198}; 199MODULE_DEVICE_TABLE(i2c, tda9840_id); 200 201static struct i2c_driver tda9840_driver = { 202 .driver = { 203 .owner = THIS_MODULE, 204 .name = "tda9840", 205 }, 206 .probe = tda9840_probe, 207 .remove = tda9840_remove, 208 .id_table = tda9840_id, 209}; 210 211static __init int init_tda9840(void) 212{ 213 return i2c_add_driver(&tda9840_driver); 214} 215 216static __exit void exit_tda9840(void) 217{ 218 i2c_del_driver(&tda9840_driver); 219} 220 221module_init(init_tda9840); 222module_exit(exit_tda9840); 223