1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2006-2007 PA Semi, Inc
4 *
5 * SMBus host driver for PA Semi PWRficient
6 */
7
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/kernel.h>
11#include <linux/stddef.h>
12#include <linux/sched.h>
13#include <linux/i2c.h>
14#include <linux/delay.h>
15#include <linux/slab.h>
16#include <linux/io.h>
17
18#include "i2c-pasemi-core.h"
19
20#define CLK_100K_DIV 84
21#define CLK_400K_DIV 21
22
23static struct pci_driver pasemi_smb_pci_driver;
24
25static int pasemi_smb_pci_probe(struct pci_dev *dev,
26 const struct pci_device_id *id)
27{
28 struct pasemi_smbus *smbus;
29 unsigned long base;
30 int size;
31 int error;
32
33 if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
34 return -ENODEV;
35
36 smbus = devm_kzalloc(dev: &dev->dev, size: sizeof(*smbus), GFP_KERNEL);
37 if (!smbus)
38 return -ENOMEM;
39
40 smbus->dev = &dev->dev;
41 base = pci_resource_start(dev, 0);
42 size = pci_resource_len(dev, 0);
43 smbus->clk_div = CLK_100K_DIV;
44
45 /*
46 * The original PASemi PCI controllers don't have a register for
47 * their HW revision.
48 */
49 smbus->hw_rev = PASEMI_HW_REV_PCI;
50
51 if (!devm_request_region(&dev->dev, base, size,
52 pasemi_smb_pci_driver.name))
53 return -EBUSY;
54
55 smbus->ioaddr = pcim_iomap(pdev: dev, bar: 0, maxlen: 0);
56 if (!smbus->ioaddr)
57 return -EBUSY;
58
59 smbus->adapter.class = I2C_CLASS_HWMON;
60 error = pasemi_i2c_common_probe(smbus);
61 if (error)
62 return error;
63
64 pci_set_drvdata(pdev: dev, data: smbus);
65
66 return 0;
67}
68
69static const struct pci_device_id pasemi_smb_pci_ids[] = {
70 { PCI_DEVICE(0x1959, 0xa003) },
71 { 0, }
72};
73
74MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
75
76static struct pci_driver pasemi_smb_pci_driver = {
77 .name = "i2c-pasemi",
78 .id_table = pasemi_smb_pci_ids,
79 .probe = pasemi_smb_pci_probe,
80};
81
82module_pci_driver(pasemi_smb_pci_driver);
83
84MODULE_LICENSE("GPL");
85MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
86MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
87

source code of linux/drivers/i2c/busses/i2c-pasemi-pci.c