cregit-Linux how code gets into the kernel

Release 4.7 drivers/w1/masters/matrox_w1.c

/*
 *      matrox_w1.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
 *
 *
 * 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 <asm/types.h>
#include <linux/atomic.h>
#include <asm/io.h>

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>
#include <linux/pci.h>

#include "../w1.h"
#include "../w1_int.h"
#include "../w1_log.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire protocol) over VGA DDC(matrox gpio).");


static struct pci_device_id matrox_w1_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
	{ },
};
MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);

static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
static void matrox_w1_remove(struct pci_dev *);


static struct pci_driver matrox_w1_pci_driver = {
	.name = "matrox_w1",
	.id_table = matrox_w1_tbl,
	.probe = matrox_w1_probe,
	.remove = matrox_w1_remove,
};

/*
 * Matrox G400 DDC registers.
 */


#define MATROX_G400_DDC_CLK		(1<<4)

#define MATROX_G400_DDC_DATA		(1<<1)


#define MATROX_BASE			0x3C00

#define MATROX_STATUS			0x1e14


#define MATROX_PORT_INDEX_OFFSET	0x00

#define MATROX_PORT_DATA_OFFSET		0x0A


#define MATROX_GET_CONTROL		0x2A

#define MATROX_GET_DATA			0x2B

#define MATROX_CURSOR_CTL		0x06


struct matrox_device
{
	
void __iomem *base_addr;
	
void __iomem *port_index;
	
void __iomem *port_data;
	
u8 data_mask;

	
unsigned long phys_addr;
	
void __iomem *virt_addr;
	
unsigned long found;

	
struct w1_bus_master *bus_master;
};

static u8 matrox_w1_read_ddc_bit(void *);
static void matrox_w1_write_ddc_bit(void *, u8);

/*
 * These functions read and write DDC Data bit.
 *
 * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
 * Unfortunately we can't connect to Intel's 82801xx IO controller
 * since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
 *
 * I've heard that PIIX also has open drain pin.
 *
 * Port mapping.
 */

static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg) { u8 ret; writeb(reg, dev->port_index); ret = readb(dev->port_data); barrier(); return ret; }

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greg kroah-hartmangreg kroah-hartman42100.00%1100.00%
Total42100.00%1100.00%


static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val) { writeb(reg, dev->port_index); writeb(val, dev->port_data); wmb(); }

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greg kroah-hartmangreg kroah-hartman39100.00%1100.00%
Total39100.00%1100.00%


static void matrox_w1_write_ddc_bit(void *data, u8 bit) { u8 ret; struct matrox_device *dev = data; if (bit) bit = 0; else bit = dev->data_mask; ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL); matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit)); matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00); }

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greg kroah-hartmangreg kroah-hartman7497.37%150.00%
evgeniy polyakovevgeniy polyakov22.63%150.00%
Total76100.00%2100.00%


static u8 matrox_w1_read_ddc_bit(void *data) { u8 ret; struct matrox_device *dev = data; ret = matrox_w1_read_reg(dev, MATROX_GET_DATA); return ret; }

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greg kroah-hartmangreg kroah-hartman3093.75%150.00%
evgeniy polyakovevgeniy polyakov26.25%150.00%
Total32100.00%2100.00%


static void matrox_w1_hw_init(struct matrox_device *dev) { matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF); matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00); }

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greg kroah-hartmangreg kroah-hartman29100.00%1100.00%
Total29100.00%1100.00%


static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct matrox_device *dev; int err; assert(pdev != NULL); assert(ent != NULL); if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400) return -ENODEV; dev = kzalloc(sizeof(struct matrox_device) + sizeof(struct w1_bus_master), GFP_KERNEL); if (!dev) { dev_err(&pdev->dev, "%s: Failed to create new matrox_device object.\n", __func__); return -ENOMEM; } dev->bus_master = (struct w1_bus_master *)(dev + 1); /* * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c */ dev->phys_addr = pci_resource_start(pdev, 1); dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384); if (!dev->virt_addr) { dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n", __func__, dev->phys_addr, 16384); err = -EIO; goto err_out_free_device; } dev->base_addr = dev->virt_addr + MATROX_BASE; dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET; dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET; dev->data_mask = (MATROX_G400_DDC_DATA); matrox_w1_hw_init(dev); dev->bus_master->data = dev; dev->bus_master->read_bit = &matrox_w1_read_ddc_bit; dev->bus_master->write_bit = &matrox_w1_write_ddc_bit; err = w1_add_master_device(dev->bus_master); if (err) goto err_out_free_device; pci_set_drvdata(pdev, dev); dev->found = 1; dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n"); return 0; err_out_free_device: if (dev->virt_addr) iounmap(dev->virt_addr); kfree(dev); return err; }

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greg kroah-hartmangreg kroah-hartman29395.13%125.00%
amol ladamol lad134.22%125.00%
evgeniy polyakovevgeniy polyakov10.32%125.00%
yoann padioleauyoann padioleau10.32%125.00%
Total308100.00%4100.00%


static void matrox_w1_remove(struct pci_dev *pdev) { struct matrox_device *dev = pci_get_drvdata(pdev); assert(dev != NULL); if (dev->found) { w1_remove_master_device(dev->bus_master); iounmap(dev->virt_addr); } kfree(dev); }

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greg kroah-hartmangreg kroah-hartman55100.00%1100.00%
Total55100.00%1100.00%

module_pci_driver(matrox_w1_pci_driver);

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greg kroah-hartmangreg kroah-hartman77393.92%17.69%
evgeniy polyakovevgeniy polyakov161.94%430.77%
al viroal viro141.70%17.69%
amol ladamol lad131.58%17.69%
vaishali thakkarvaishali thakkar20.24%17.69%
yoann padioleauyoann padioleau10.12%17.69%
geert uytterhoevengeert uytterhoeven10.12%17.69%
arun sharmaarun sharma10.12%17.69%
uwe kleine-koenig* (is this really uwe)uwe kleine-koenig* (is this really uwe)10.12%17.69%
masanari iidamasanari iida10.12%17.69%
Total823100.00%13100.00%
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