projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fc279cc2 HV |
1 | /* |
| 2 | * Cirrus Logic cs3308 8-Channel Analog Volume Control | |
| 3 | * | |
| 4 | * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> | |
| 5 | * Copyright (C) 2012 Steven Toth <stoth@kernellabs.com> | |
| 6 | * | |
| 7 | * Derived from cs5345.c Copyright (C) 2007 Hans Verkuil | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or modify | |
| 10 | * it under the terms of the GNU General Public License as published by | |
| 11 | * the Free Software Foundation; either version 2 of the License, or | |
| 12 | * (at your option) any later version. | |
| 13 | * | |
| 14 | * This program is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | * GNU General Public License for more details. | |
| 18 | */ | |
| 19 | ||
| 20 | ||
| 21 | #include <linux/module.h> | |
| 22 | #include <linux/kernel.h> | |
| 23 | #include <linux/i2c.h> | |
| 24 | #include <linux/slab.h> | |
| 25 | #include <linux/videodev2.h> | |
| 26 | #include <media/v4l2-device.h> | |
| 27 | ||
| 28 | MODULE_DESCRIPTION("i2c device driver for cs3308 8-channel volume control"); | |
| 29 | MODULE_AUTHOR("Devin Heitmueller"); | |
| 30 | MODULE_LICENSE("GPL"); | |
| 31 | ||
| 32 | static inline int cs3308_write(struct v4l2_subdev *sd, u8 reg, u8 value) | |
| 33 | { | |
| 34 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
| 35 | ||
| 36 | return i2c_smbus_write_byte_data(client, reg, value); | |
| 37 | } | |
| 38 | ||
| 39 | static inline int cs3308_read(struct v4l2_subdev *sd, u8 reg) | |
| 40 | { | |
| 41 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
| 42 | ||
| 43 | return i2c_smbus_read_byte_data(client, reg); | |
| 44 | } | |
| 45 | ||
| 46 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
| 47 | static int cs3308_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) | |
| 48 | { | |
| 49 | reg->val = cs3308_read(sd, reg->reg & 0xffff); | |
| 50 | reg->size = 1; | |
| 51 | return 0; | |
| 52 | } | |
| 53 | ||
| 54 | static int cs3308_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) | |
| 55 | { | |
| 56 | cs3308_write(sd, reg->reg & 0xffff, reg->val & 0xff); | |
| 57 | return 0; | |
| 58 | } | |
| 59 | #endif | |
| 60 | ||
| 61 | /* ----------------------------------------------------------------------- */ | |
| 62 | ||
| 63 | static const struct v4l2_subdev_core_ops cs3308_core_ops = { | |
| 64 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
| 65 | .g_register = cs3308_g_register, | |
| 66 | .s_register = cs3308_s_register, | |
| 67 | #endif | |
| 68 | }; | |
| 69 | ||
| 70 | static const struct v4l2_subdev_ops cs3308_ops = { | |
| 71 | .core = &cs3308_core_ops, | |
| 72 | }; | |
| 73 | ||
| 74 | /* ----------------------------------------------------------------------- */ | |
| 75 | ||
| 76 | static int cs3308_probe(struct i2c_client *client, | |
| 77 | const struct i2c_device_id *id) | |
| 78 | { | |
| 79 | struct v4l2_subdev *sd; | |
| 80 | unsigned i; | |
| 81 | ||
| 82 | /* Check if the adapter supports the needed features */ | |
| 83 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
| 84 | return -EIO; | |
| 85 | ||
| 86 | if ((i2c_smbus_read_byte_data(client, 0x1c) & 0xf0) != 0xe0) | |
| 87 | return -ENODEV; | |
| 88 | ||
| 89 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
| 90 | client->addr << 1, client->adapter->name); | |
| 91 | ||
| 92 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); | |
| 93 | if (sd == NULL) | |
| 94 | return -ENOMEM; | |
| 95 | ||
| 96 | v4l2_i2c_subdev_init(sd, client, &cs3308_ops); | |
| 97 | ||
| 98 | /* Set some reasonable defaults */ | |
| 99 | cs3308_write(sd, 0x0d, 0x00); /* Power up all channels */ | |
| 100 | cs3308_write(sd, 0x0e, 0x00); /* Master Power */ | |
| 101 | cs3308_write(sd, 0x0b, 0x00); /* Device Configuration */ | |
| 102 | /* Set volume for each channel */ | |
| 103 | for (i = 1; i <= 8; i++) | |
| 104 | cs3308_write(sd, i, 0xd2); | |
| 105 | cs3308_write(sd, 0x0a, 0x00); /* Unmute all channels */ | |
| 106 | return 0; | |
| 107 | } | |
| 108 | ||
| 109 | /* ----------------------------------------------------------------------- */ | |
| 110 | ||
| 111 | static int cs3308_remove(struct i2c_client *client) | |
| 112 | { | |
| 113 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
| 114 | ||
| 115 | v4l2_device_unregister_subdev(sd); | |
| 116 | kfree(sd); | |
| 117 | return 0; | |
| 118 | } | |
| 119 | ||
| 120 | /* ----------------------------------------------------------------------- */ | |
| 121 | ||
| 122 | static const struct i2c_device_id cs3308_id[] = { | |
| 123 | { "cs3308", 0 }, | |
| 124 | { } | |
| 125 | }; | |
| 126 | MODULE_DEVICE_TABLE(i2c, cs3308_id); | |
| 127 | ||
| 128 | static struct i2c_driver cs3308_driver = { | |
| 129 | .driver = { | |
| fc279cc2 HV |
130 | .name = "cs3308", |
| 131 | }, | |
| 132 | .probe = cs3308_probe, | |
| 133 | .remove = cs3308_remove, | |
| 134 | .id_table = cs3308_id, | |
| 135 | }; | |
| 136 | ||
| 137 | module_i2c_driver(cs3308_driver); |