[ARM] 4246/1: i2c-pxa: add adapter class to platform specific data

Reposted patch for kernel 2.6.21-rc2.

The driver i2c-pxa doesn't set the class member in i2c_adapter, which
is used to register the I2C adapter. The hwmon (sensors) drivers (e.g.
adm1021) that are connected to a i2c-pxa adapter don't attach because
they expect that the adapter supports class I2C_CLASS_HWMON.

This patch adds functionality to allow platforms to set the class and
pass it as platform_data to the i2c-pxa driver. Sample usage in
platform code:

static struct i2c_pxa_platform_data my_i2c_platform_data = {
	.class = I2C_CLASS_HWMON
};

static void __init my_platform_init(void)
{
	(void) platform_add_devices(devices, ARRAY_SIZE(devices));

	pxa_set_i2c_info(&my_i2c_platform_data);
}

Signed-off-by: Matej Kenda <matej.kenda@hermes-softlab.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 14e83d0..11c7477 100644 (file)
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -839,9 +839,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
 {
        struct pxa_i2c *i2c = &i2c_pxa;
        struct resource *res;
-#ifdef CONFIG_I2C_PXA_SLAVE
        struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
-#endif
        int ret;
        int irq;
 
@@ -911,6 +909,10 @@ static int i2c_pxa_probe(struct platform_device *dev)
        i2c->adap.algo_data = i2c;
        i2c->adap.dev.parent = &dev->dev;
 
+       if (plat) {
+               i2c->adap.class = plat->class;
+       }
+
        ret = i2c_add_adapter(&i2c->adap);
        if (ret < 0) {
                printk(KERN_INFO "I2C: Failed to add bus\n");

diff --git a/include/asm-arm/arch-pxa/i2c.h b/include/asm-arm/arch-pxa/i2c.h
index 46ec224..e404b23 100644 (file)
--- a/include/asm-arm/arch-pxa/i2c.h
+++ b/include/asm-arm/arch-pxa/i2c.h
@@ -64,6 +64,7 @@ struct i2c_slave_client;
 struct i2c_pxa_platform_data {
        unsigned int            slave_addr;
        struct i2c_slave_client *slave;
+       unsigned int            class;
 };
 
 extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);