linux-kernel - Re: [PATCH v2] i2c: move acpi code back into the core

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Date:	Thu, 25 Sep 2014 12:02:27 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lan Tianyu <tianyu.lan@...el.com>,
	Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH v2] i2c: move acpi code back into the core

On Wed, Sep 24, 2014 at 11:36:31PM +0200, Wolfram Sang wrote:
> Commit 5d98e61d337c ("I2C/ACPI: Add i2c ACPI operation region support")
> renamed the i2c-core module. This may cause regressions for
> distributions, so put the ACPI code back into the core.
> 
> Reported-by: Jean Delvare <jdelvare@...e.de>
> Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>

Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

One comment though,

> Cc: Lan Tianyu <tianyu.lan@...el.com>
> Cc: Jean Delvare <jdelvare@...e.de>
> ---
> +#if defined(CONFIG_ACPI)
> +struct acpi_i2c_handler_data {
> +	struct acpi_connection_info info;
> +	struct i2c_adapter *adapter;
> +};
> +
> +struct gsb_buffer {
> +	u8	status;
> +	u8	len;
> +	union {
> +		u16	wdata;
> +		u8	bdata;
> +		u8	data[0];
> +	};
> +} __packed;

These two structures should be inside CONFIG_ACPI_I2C_OPREGION because
they are used in that code. However, this still works fine now as you
can't select CONFIG_ACPI_I2C_OPREGION without CONFIG_ACPI.

> +
> +static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
> +{
> +	struct i2c_board_info *info = data;
> +
> +	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
> +		struct acpi_resource_i2c_serialbus *sb;
> +
> +		sb = &ares->data.i2c_serial_bus;
> +		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) {
> +			info->addr = sb->slave_address;
> +			if (sb->access_mode == ACPI_I2C_10BIT_MODE)
> +				info->flags |= I2C_CLIENT_TEN;
> +		}
> +	} else if (info->irq < 0) {
> +		struct resource r;
> +
> +		if (acpi_dev_resource_interrupt(ares, 0, &r))
> +			info->irq = r.start;
> +	}
> +
> +	/* Tell the ACPI core to skip this resource */
> +	return 1;
> +}
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