diff options
| author | Jean Delvare <khali@linux-fr.org> | 2009-09-18 22:45:46 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2009-09-18 22:45:46 +0200 |
| commit | 2bb5095affdb8d6e8646a5b8b5a35c1d6a28c3e7 (patch) | |
| tree | 5fb1e8ae4f2882a592855b5c2afd2872a312cbb8 | |
| parent | 4f8cf8240a0c8b232c2ae22e019a4ba1d5f19ccd (diff) | |
i2c: Provide compatibility links for i2c adapters
Some user-space applications may be relying on i2c adapters showing up
as class devices in sysfs. Provide compatibility links for them for
the time being. We will remove them after a long transition period.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
| -rw-r--r-- | drivers/i2c/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.c | 33 |
2 files changed, 40 insertions, 1 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 711ca08ab77..d7ece131b4f 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -27,6 +27,14 @@ config I2C_BOARDINFO boolean default y +config I2C_COMPAT + boolean "Enable compatibility bits for old user-space" + default y + help + Say Y here if you intend to run lm-sensors 3.1.1 or older, or any + other user-space package which expects i2c adapters to be class + devices. If you don't know, say Y. + config I2C_CHARDEV tristate "I2C device interface" help diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index a18a251dabf..8d80fceca6a 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -538,6 +538,10 @@ static struct device_type i2c_adapter_type = { .release = i2c_adapter_dev_release, }; +#ifdef CONFIG_I2C_COMPAT +static struct class_compat *i2c_adapter_compat_class; +#endif + static void i2c_scan_static_board_info(struct i2c_adapter *adapter) { struct i2c_devinfo *devinfo; @@ -595,6 +599,14 @@ static int i2c_register_adapter(struct i2c_adapter *adap) dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); +#ifdef CONFIG_I2C_COMPAT + res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); + if (res) + dev_warn(&adap->dev, + "Failed to create compatibility class link\n"); +#endif + /* create pre-declared device nodes */ if (adap->nr < __i2c_first_dynamic_bus_num) i2c_scan_static_board_info(adap); @@ -773,6 +785,11 @@ int i2c_del_adapter(struct i2c_adapter *adap) checking the returned value. */ res = device_for_each_child(&adap->dev, NULL, __unregister_client); +#ifdef CONFIG_I2C_COMPAT + class_compat_remove_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); +#endif + /* clean up the sysfs representation */ init_completion(&adap->dev_released); device_unregister(&adap->dev); @@ -978,12 +995,23 @@ static int __init i2c_init(void) retval = bus_register(&i2c_bus_type); if (retval) return retval; +#ifdef CONFIG_I2C_COMPAT + i2c_adapter_compat_class = class_compat_register("i2c-adapter"); + if (!i2c_adapter_compat_class) { + retval = -ENOMEM; + goto bus_err; + } +#endif retval = i2c_add_driver(&dummy_driver); if (retval) - goto bus_err; + goto class_err; return 0; +class_err: +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); bus_err: +#endif bus_unregister(&i2c_bus_type); return retval; } @@ -991,6 +1019,9 @@ bus_err: static void __exit i2c_exit(void) { i2c_del_driver(&dummy_driver); +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); +#endif bus_unregister(&i2c_bus_type); } |