projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8ffbc655 HV |
1 | /* |
| 2 | * v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical | |
| 3 | * for all V4L2 I2C drivers. Use this header if the | |
| 4 | * I2C driver is used by both legacy drivers and | |
| 5 | * drivers converted to the bus-based I2C API. | |
| 6 | * | |
| 7 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> | |
| 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 | * You should have received a copy of the GNU General Public License | |
| 20 | * along with this program; if not, write to the Free Software | |
| 21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 22 | */ | |
| 23 | ||
| 24 | struct v4l2_i2c_driver_data { | |
| 25 | const char * const name; | |
| 26 | int driverid; | |
| 27 | int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); | |
| 28 | int (*probe)(struct i2c_client *client); | |
| 29 | int (*remove)(struct i2c_client *client); | |
| 30 | int (*suspend)(struct i2c_client *client, pm_message_t state); | |
| 31 | int (*resume)(struct i2c_client *client); | |
| 88307eb3 | 32 | int (*legacy_probe)(struct i2c_adapter *adapter); |
| 8ffbc655 HV |
33 | int legacy_class; |
| 34 | }; | |
| 35 | ||
| 36 | static struct v4l2_i2c_driver_data v4l2_i2c_data; | |
| 37 | static struct i2c_client_address_data addr_data; | |
| 38 | static struct i2c_driver v4l2_i2c_driver_legacy; | |
| 39 | static char v4l2_i2c_drv_name_legacy[32]; | |
| 40 | ||
| 41 | static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind) | |
| 42 | { | |
| 43 | return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy, | |
| 44 | v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe); | |
| 45 | } | |
| 46 | ||
| 47 | static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter) | |
| 48 | { | |
| 88307eb3 HV |
49 | if (v4l2_i2c_data.legacy_probe) { |
| 50 | if (v4l2_i2c_data.legacy_probe(adapter)) | |
| 51 | return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); | |
| 52 | return 0; | |
| 53 | } | |
| 8ffbc655 HV |
54 | if (adapter->class & v4l2_i2c_data.legacy_class) |
| 55 | return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); | |
| 56 | return 0; | |
| 57 | } | |
| 58 | ||
| 59 | static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client) | |
| 60 | { | |
| 61 | int err = i2c_detach_client(client); | |
| 62 | ||
| 63 | if (err) | |
| 64 | return err; | |
| 65 | if (v4l2_i2c_data.remove) | |
| 66 | v4l2_i2c_data.remove(client); | |
| 67 | kfree(client); | |
| 68 | ||
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state) | |
| 73 | { | |
| 74 | return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0; | |
| 75 | } | |
| 76 | ||
| 77 | static int v4l2_i2c_drv_resume_helper(struct i2c_client *client) | |
| 78 | { | |
| 79 | return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0; | |
| 80 | } | |
| 81 | ||
| 82 | /* ----------------------------------------------------------------------- */ | |
| 83 | ||
| 84 | /* i2c implementation */ | |
| 85 | static struct i2c_driver v4l2_i2c_driver_legacy = { | |
| 86 | .driver = { | |
| 87 | .owner = THIS_MODULE, | |
| 88 | }, | |
| 89 | .attach_adapter = v4l2_i2c_drv_probe_legacy, | |
| 90 | .detach_client = v4l2_i2c_drv_detach_legacy, | |
| 91 | .suspend = v4l2_i2c_drv_suspend_helper, | |
| 92 | .resume = v4l2_i2c_drv_resume_helper, | |
| 93 | }; | |
| 94 | ||
| 95 | /* ----------------------------------------------------------------------- */ | |
| 96 | ||
| 97 | /* i2c implementation */ | |
| 98 | static struct i2c_driver v4l2_i2c_driver = { | |
| 99 | .suspend = v4l2_i2c_drv_suspend_helper, | |
| 100 | .resume = v4l2_i2c_drv_resume_helper, | |
| 101 | }; | |
| 102 | ||
| 103 | static int __init v4l2_i2c_drv_init(void) | |
| 104 | { | |
| 105 | int err; | |
| 106 | ||
| 107 | strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy)); | |
| 108 | strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy)); | |
| 109 | ||
| 110 | if (v4l2_i2c_data.legacy_class == 0) | |
| 111 | v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG; | |
| 112 | ||
| 113 | v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy; | |
| 114 | v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid; | |
| 115 | v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command; | |
| 116 | err = i2c_add_driver(&v4l2_i2c_driver_legacy); | |
| 117 | ||
| 118 | if (err) | |
| 119 | return err; | |
| 120 | v4l2_i2c_driver.driver.name = v4l2_i2c_data.name; | |
| 121 | v4l2_i2c_driver.id = v4l2_i2c_data.driverid; | |
| 122 | v4l2_i2c_driver.command = v4l2_i2c_data.command; | |
| 123 | v4l2_i2c_driver.probe = v4l2_i2c_data.probe; | |
| 124 | v4l2_i2c_driver.remove = v4l2_i2c_data.remove; | |
| 125 | err = i2c_add_driver(&v4l2_i2c_driver); | |
| 126 | if (err) | |
| 127 | i2c_del_driver(&v4l2_i2c_driver_legacy); | |
| 128 | return err; | |
| 129 | } | |
| 130 | ||
| 131 | static void __exit v4l2_i2c_drv_cleanup(void) | |
| 132 | { | |
| 133 | i2c_del_driver(&v4l2_i2c_driver_legacy); | |
| 134 | i2c_del_driver(&v4l2_i2c_driver); | |
| 135 | } | |
| 136 | ||
| 137 | module_init(v4l2_i2c_drv_init); | |
| 138 | module_exit(v4l2_i2c_drv_cleanup); |