1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 tda9840 - i2c-driver for the tda9840 by SGS Thomson 4 5 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> 6 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> 7 8 The tda9840 is a stereo/dual sound processor with digital 9 identification. It can be found at address 0x84 on the i2c-bus. 10 11 For detailed information download the specifications directly 12 from SGS Thomson at http://www.st.com 13 14 */ 15 16 17 #include <linux/module.h> 18 #include <linux/ioctl.h> 19 #include <linux/slab.h> 20 #include <linux/i2c.h> 21 #include <media/v4l2-device.h> 22 23 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 24 MODULE_DESCRIPTION("tda9840 driver"); 25 MODULE_LICENSE("GPL"); 26 27 static int debug; 28 module_param(debug, int, 0644); 29 30 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 31 32 #define SWITCH 0x00 33 #define LEVEL_ADJUST 0x02 34 #define STEREO_ADJUST 0x03 35 #define TEST 0x04 36 37 #define TDA9840_SET_MUTE 0x00 38 #define TDA9840_SET_MONO 0x10 39 #define TDA9840_SET_STEREO 0x2a 40 #define TDA9840_SET_LANG1 0x12 41 #define TDA9840_SET_LANG2 0x1e 42 #define TDA9840_SET_BOTH 0x1a 43 #define TDA9840_SET_BOTH_R 0x16 44 #define TDA9840_SET_EXTERNAL 0x7a 45 46 47 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) 48 { 49 struct i2c_client *client = v4l2_get_subdevdata(sd); 50 51 if (i2c_smbus_write_byte_data(client, reg, val)) 52 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", 53 val, reg); 54 } 55 56 static int tda9840_status(struct v4l2_subdev *sd) 57 { 58 struct i2c_client *client = v4l2_get_subdevdata(sd); 59 int rc; 60 u8 byte; 61 62 rc = i2c_master_recv(client, &byte, 1); 63 if (rc != 1) { 64 v4l2_dbg(1, debug, sd, 65 "i2c_master_recv() failed\n"); 66 if (rc < 0) 67 return rc; 68 return -EIO; 69 } 70 71 if (byte & 0x80) { 72 v4l2_dbg(1, debug, sd, 73 "TDA9840_DETECT: register contents invalid\n"); 74 return -EINVAL; 75 } 76 77 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); 78 return byte & 0x60; 79 } 80 81 static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) 82 { 83 int stat = tda9840_status(sd); 84 int byte; 85 86 if (t->index) 87 return -EINVAL; 88 89 stat = stat < 0 ? 0 : stat; 90 if (stat == 0 || stat == 0x60) /* mono input */ 91 byte = TDA9840_SET_MONO; 92 else if (stat == 0x40) /* stereo input */ 93 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? 94 TDA9840_SET_MONO : TDA9840_SET_STEREO; 95 else { /* bilingual */ 96 switch (t->audmode) { 97 case V4L2_TUNER_MODE_LANG1_LANG2: 98 byte = TDA9840_SET_BOTH; 99 break; 100 case V4L2_TUNER_MODE_LANG2: 101 byte = TDA9840_SET_LANG2; 102 break; 103 default: 104 byte = TDA9840_SET_LANG1; 105 break; 106 } 107 } 108 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); 109 tda9840_write(sd, SWITCH, byte); 110 return 0; 111 } 112 113 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) 114 { 115 int stat = tda9840_status(sd); 116 117 if (stat < 0) 118 return stat; 119 120 t->rxsubchans = V4L2_TUNER_SUB_MONO; 121 122 switch (stat & 0x60) { 123 case 0x00: 124 t->rxsubchans = V4L2_TUNER_SUB_MONO; 125 break; 126 case 0x20: 127 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; 128 break; 129 case 0x40: 130 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; 131 break; 132 default: /* Incorrect detect */ 133 t->rxsubchans = V4L2_TUNER_MODE_MONO; 134 break; 135 } 136 return 0; 137 } 138 139 /* ----------------------------------------------------------------------- */ 140 141 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { 142 .s_tuner = tda9840_s_tuner, 143 .g_tuner = tda9840_g_tuner, 144 }; 145 146 static const struct v4l2_subdev_ops tda9840_ops = { 147 .tuner = &tda9840_tuner_ops, 148 }; 149 150 /* ----------------------------------------------------------------------- */ 151 152 static int tda9840_probe(struct i2c_client *client) 153 { 154 struct v4l2_subdev *sd; 155 156 /* let's see whether this adapter can support what we need */ 157 if (!i2c_check_functionality(client->adapter, 158 I2C_FUNC_SMBUS_READ_BYTE_DATA | 159 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) 160 return -EIO; 161 162 v4l_info(client, "chip found @ 0x%x (%s)\n", 163 client->addr << 1, client->adapter->name); 164 165 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 166 if (sd == NULL) 167 return -ENOMEM; 168 v4l2_i2c_subdev_init(sd, client, &tda9840_ops); 169 170 /* set initial values for level & stereo - adjustment, mode */ 171 tda9840_write(sd, LEVEL_ADJUST, 0); 172 tda9840_write(sd, STEREO_ADJUST, 0); 173 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); 174 return 0; 175 } 176 177 static void tda9840_remove(struct i2c_client *client) 178 { 179 struct v4l2_subdev *sd = i2c_get_clientdata(client); 180 181 v4l2_device_unregister_subdev(sd); 182 } 183 184 static const struct i2c_device_id tda9840_id[] = { 185 { "tda9840", 0 }, 186 { } 187 }; 188 MODULE_DEVICE_TABLE(i2c, tda9840_id); 189 190 static struct i2c_driver tda9840_driver = { 191 .driver = { 192 .name = "tda9840", 193 }, 194 .probe = tda9840_probe, 195 .remove = tda9840_remove, 196 .id_table = tda9840_id, 197 }; 198 199 module_i2c_driver(tda9840_driver); 200