i2c/busses/i2c-pasemi-pci.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2006-2007 PA Semi, Inc
0004  *
0005  * SMBus host driver for PA Semi PWRficient
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/pci.h>
0010 #include <linux/kernel.h>
0011 #include <linux/stddef.h>
0012 #include <linux/sched.h>
0013 #include <linux/i2c.h>
0014 #include <linux/delay.h>
0015 #include <linux/slab.h>
0016 #include <linux/io.h>
0017
0018 #include "i2c-pasemi-core.h"
0019
0020 #define CLK_100K_DIV    84
0021 #define CLK_400K_DIV    21
0022
0023 static struct pci_driver pasemi_smb_pci_driver;
0024
0025 static int pasemi_smb_pci_probe(struct pci_dev *dev,
0026                       const struct pci_device_id *id)
0027 {
0028     struct pasemi_smbus *smbus;
0029     unsigned long base;
0030     int size;
0031     int error;
0032
0033     if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
0034         return -ENODEV;
0035
0036     smbus = devm_kzalloc(&dev->dev, sizeof(*smbus), GFP_KERNEL);
0037     if (!smbus)
0038         return -ENOMEM;
0039
0040     smbus->dev = &dev->dev;
0041     base = pci_resource_start(dev, 0);
0042     size = pci_resource_len(dev, 0);
0043     smbus->clk_div = CLK_100K_DIV;
0044
0045     /*
0046      * The original PASemi PCI controllers don't have a register for
0047      * their HW revision.
0048      */
0049     smbus->hw_rev = PASEMI_HW_REV_PCI;
0050
0051     if (!devm_request_region(&dev->dev, base, size,
0052                 pasemi_smb_pci_driver.name))
0053         return -EBUSY;
0054
0055     smbus->ioaddr = pcim_iomap(dev, 0, 0);
0056     if (!smbus->ioaddr)
0057         return -EBUSY;
0058
0059     smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
0060     error = pasemi_i2c_common_probe(smbus);
0061     if (error)
0062         return error;
0063
0064     pci_set_drvdata(dev, smbus);
0065
0066     return 0;
0067 }
0068
0069 static const struct pci_device_id pasemi_smb_pci_ids[] = {
0070     { PCI_DEVICE(0x1959, 0xa003) },
0071     { 0, }
0072 };
0073
0074 MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
0075
0076 static struct pci_driver pasemi_smb_pci_driver = {
0077     .name       = "i2c-pasemi",
0078     .id_table   = pasemi_smb_pci_ids,
0079     .probe      = pasemi_smb_pci_probe,
0080 };
0081
0082 module_pci_driver(pasemi_smb_pci_driver);
0083
0084 MODULE_LICENSE("GPL");
0085 MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
0086 MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");