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
23 static struct pci_driver pasemi_smb_pci_driver;
24
pasemi_smb_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)25 static 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, 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(dev, 0, 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(dev, smbus);
65
66 return 0;
67 }
68
69 static const struct pci_device_id pasemi_smb_pci_ids[] = {
70 { PCI_DEVICE(0x1959, 0xa003) },
71 { 0, }
72 };
73
74 MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
75
76 static 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
82 module_pci_driver(pasemi_smb_pci_driver);
83
84 MODULE_LICENSE("GPL");
85 MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
86 MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
87