Okay...
I found a solution, but it feels more like a hack :)
I am using the setup callback of the pca953x driver to register
all needed platform devices. Is there a better way?
thanks
--
Christian Gmeiner, MSc
2011/11/22 Christian Gmeiner <christian.gmeiner@xxxxxxxxx>:
> Hi ml,
>
> I run into a little problem, which I don't know how to solve it.
> I am using the eg20t i2c bus and a custom platform init
> driver, which gets started after eg20t is ready.
>
> And there I do the following:
>
> /* buzzer and relay */
> static struct gpio_led _gpio[] = {
> {
> .name = "relay",
> .gpio = 0,
> .active_low = 0,
> .default_state = LEDS_GPIO_DEFSTATE_OFF,
> .default_trigger = "timer",
> }
> };
>
> static struct gpio_led_platform_data _gpio_data = {
> .num_leds = ARRAY_SIZE(_gpio),
> .leds = _gpio,
> };
>
> static struct platform_device _gpio_hw = {
> .name = "leds-gpio",
> .dev.platform_data = &_gpio_data,
> };
>
> static struct platform_device *devices_tc[] = {
> &ot1300_gpio_hw,
> };
>
>
> int tunnelcreek_init(void)
> {
> struct i2c_adapter *i2c_adap;
>
> /* we use the integrated i2c adapter */
> i2c_adap = i2c_get_adapter(0);
>
> if (!i2c_adap)
> return -EIO;
>
> eeprom = i2c_new_device(i2c_adap, &i2c_eeprom);
> pca953x = i2c_new_device(i2c_adap, &pca9555_info);
> lm75 = i2c_new_device(i2c_adap, &lm75_info);
>
> platform_add_devices(devices_tc, ARRAY_SIZE(devices_tc));
>
> return 0;
> }
>
> If I run this code I get following messages:
>
> [ 1.552122] i2c 0-0050: uevent
> [ 1.552307] at24 0-0050: probe
> [ 1.552361] i2c 0-0051: uevent
> [ 1.552530] dummy 0-0051: probe
> [ 1.552544] i2c i2c-0: client [dummy] registered with bus id 0-0051
> [ 1.552559] at24 0-0050: 512 byte 24c04 EEPROM, writable, 16 bytes/write
> [ 1.552644] i2c i2c-0: master_xfer[0] W, addr=0x50, len=1
> [ 1.552655] i2c i2c-0: master_xfer[1] R, addr=0x50, len=24
> [ 1.557235] i2c i2c-0: master_xfer[0] W, addr=0x51, len=1
> [ 1.557248] i2c i2c-0: master_xfer[1] R, addr=0x51, len=20
> [ 1.560820] i2c i2c-0: client [24c04] registered with bus id 0-0050
> [ 1.560944] i2c 0-0021: uevent
> [ 1.561136] i2c i2c-0: client [pca9555] registered with bus id 0-0021
> [ 1.561197] i2c 0-0048: uevent
> [ 1.561357] i2c i2c-0: client [lm75] registered with bus id 0-0048
> [ 1.561638] leds-gpio: probe of leds-gpio.0 failed with error -22
> [ 1.568354] VFS: Mounted root (ext2 filesystem) readonly on device 8:2.
> [ 1.569161] devtmpfs: mounted
> [ 1.569307] Freeing unused kernel memory: 284k freed
> [ 1.569725] Write protecting the kernel text: 2096k
> [ 1.569880] Write protecting the kernel read-only data: 1008k
> [ 1.577121] hub 1-1:1.0: USB hub found
> [ 1.579246] hub 1-1:1.0: 3 ports detected
> [ 1.795723] udev[1136]: starting version 164
> [ 1.951100] usb 5-1: new low speed USB device number 2 using ohci_hcd
> [ 1.968166] i2c 0-0021: uevent
> [ 1.968284] i2c 0-0048: uevent
> [ 1.968400] at24 0-0050: uevent
> [ 1.968510] dummy 0-0051: uevent
> [ 2.206885] i2c 0-0021: uevent
> [ 2.208069] i2c 0-0048: uevent
> [ 2.209305] at24 0-0050: uevent
> [ 2.209928] at24 0-0050: uevent
> [ 2.210459] dummy 0-0051: uevent
> [ 2.211089] dummy 0-0051: uevent
> [ 2.245582] pca953x 0-0021: probe
> [ 2.245607] i2c i2c-0: master_xfer[0] W, addr=0x21, len=1
> [ 2.245624] i2c i2c-0: master_xfer[1] R, addr=0x21, len=2
> [ 2.250589] i2c i2c-0: master_xfer[0] W, addr=0x21, len=1
> [ 2.250607] i2c i2c-0: master_xfer[1] R, addr=0x21, len=2
> [ 2.251338] i2c i2c-0: master_xfer[0] W, addr=0x21, len=3
> [ 2.251900] pca953x 0-0021: interrupt support not compiled in
> [ 2.252236] i2c-core: driver [pca953x] registered
> [
>
> The problem is that leds-gpio gets loaded before pca953x driver
> is ready. So no gpio's are available. Whats the best way to fix this?
>
> Thanks
> --
> Christian Gmeiner, MSc
>
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