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