mfd: Add VIA VX855 multi-function device support (375fc77b) · Commits · e / devices / android_kernel_teracube_emerald

drivers/mfd/Kconfig

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		@@ -576,6 +576,15 @@ config MFD_TPS6586X
		This driver can also be built as a module. If so, the module
		will be called tps6586x.

		config MFD_VX855
		tristate "Support for VIA VX855/VX875 integrated south bridge"
		depends on PCI
		select MFD_CORE
		help
		Say yes here to enable support for various functions of the
		VIA VX855/VX875 south bridge. You will need to enable the vx855_spi
		and/or vx855_gpio drivers for this to do anything useful.

		endif # MFD_SUPPORT

		menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

+1 −0

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		@@ -78,3 +78,4 @@ obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
		obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
		obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
		obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
		obj-$(CONFIG_MFD_VX855) += vx855.o

drivers/mfd/vx855.c

0 → 100644

+147 −0

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		/*
		* Linux multi-function-device driver (MFD) for the integrated peripherals
		* of the VIA VX855 chipset
		*
		* Copyright (C) 2009 VIA Technologies, Inc.
		* Copyright (C) 2010 One Laptop per Child
		* Author: Harald Welte <HaraldWelte@viatech.com>
		* All rights reserved.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License as
		* published by the Free Software Foundation; either version 2 of
		* the License, or (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
		* MA 02111-1307 USA
		*
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/device.h>
		#include <linux/platform_device.h>
		#include <linux/pci.h>
		#include <linux/mfd/core.h>

		/* offset into pci config space indicating the 16bit register containing
		* the power management IO space base */
		#define VX855_CFG_PMIO_OFFSET 0x88

		/* ACPI I/O Space registers */
		#define VX855_PMIO_ACPI 0x00
		#define VX855_PMIO_ACPI_LEN 0x0b

		/* Processor Power Management */
		#define VX855_PMIO_PPM 0x10
		#define VX855_PMIO_PPM_LEN 0x08

		/* General Purpose Power Management */
		#define VX855_PMIO_GPPM 0x20
		#define VX855_PMIO_R_GPI 0x48
		#define VX855_PMIO_R_GPO 0x4c
		#define VX855_PMIO_GPPM_LEN 0x33

		#define VSPIC_MMIO_SIZE 0x1000

		static struct resource vx855_gpio_resources[] = {
		{
		.flags = IORESOURCE_IO,
		},
		{
		.flags = IORESOURCE_IO,
		},
		};

		static struct mfd_cell vx855_cells[] = {
		{
		.name = "vx855_gpio",
		.num_resources = ARRAY_SIZE(vx855_gpio_resources),
		.resources = vx855_gpio_resources,

		/* we must ignore resource conflicts, for reasons outlined in
		* the vx855_gpio driver */
		.ignore_resource_conflicts = true,
		},
		};

		static __devinit int vx855_probe(struct pci_dev *pdev,
		const struct pci_device_id *id)
		{
		int ret;
		u16 gpio_io_offset;

		ret = pci_enable_device(pdev);
		if (ret)
		return -ENODEV;

		pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
		if (!gpio_io_offset) {
		dev_warn(&pdev->dev,
		"BIOS did not assign PMIO base offset?!?\n");
		ret = -ENODEV;
		goto out;
		}

		/* mask out the lowest seven bits, as they are always zero, but
		* hardware returns them as 0x01 */
		gpio_io_offset &= 0xff80;

		/* As the region identified here includes many non-GPIO things, we
		* only work with the specific registers that concern us. */
		vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
		vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
		vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
		vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;

		ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
		NULL, 0);

		/* we always return -ENODEV here in order to enable other
		* drivers like old, not-yet-platform_device ported i2c-viapro */
		return -ENODEV;
		out:
		pci_disable_device(pdev);
		return ret;
		}

		static void vx855_remove(struct pci_dev *pdev)
		{
		mfd_remove_devices(&pdev->dev);
		pci_disable_device(pdev);
		}

		static struct pci_device_id vx855_pci_tbl[] = {
		{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
		{ 0, }
		};

		static struct pci_driver vx855_pci_driver = {
		.name = "vx855",
		.id_table = vx855_pci_tbl,
		.probe = vx855_probe,
		.remove = __devexit_p(vx855_remove),
		};

		static int vx855_init(void)
		{
		return pci_register_driver(&vx855_pci_driver);
		}
		module_init(vx855_init);

		static void vx855_exit(void)
		{
		pci_unregister_driver(&vx855_pci_driver);
		}
		module_exit(vx855_exit);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
		MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");