1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) IBM Corporation 2023 */
4 #include <linux/cdev.h>
5 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/mod_devicetable.h>
11 #include "fsi-master-i2cr.h"
12 #include "fsi-slave.h"
17 struct fsi_master_i2cr *i2cr;
20 static loff_t i2cr_scom_llseek(struct file *file, loff_t offset, int whence)
35 static ssize_t i2cr_scom_read(struct file *filep, char __user *buf, size_t len, loff_t *offset)
37 struct i2cr_scom *scom = filep->private_data;
41 if (len != sizeof(data))
44 ret = fsi_master_i2cr_read(scom->i2cr, (u32)*offset, &data);
48 ret = copy_to_user(buf, &data, len);
55 static ssize_t i2cr_scom_write(struct file *filep, const char __user *buf, size_t len,
58 struct i2cr_scom *scom = filep->private_data;
62 if (len != sizeof(data))
65 ret = copy_from_user(&data, buf, len);
69 ret = fsi_master_i2cr_write(scom->i2cr, (u32)*offset, data);
76 static const struct file_operations i2cr_scom_fops = {
79 .llseek = i2cr_scom_llseek,
80 .read = i2cr_scom_read,
81 .write = i2cr_scom_write,
84 static int i2cr_scom_probe(struct device *dev)
86 struct fsi_device *fsi_dev = to_fsi_dev(dev);
87 struct i2cr_scom *scom;
91 if (!is_fsi_master_i2cr(fsi_dev->slave->master))
94 scom = devm_kzalloc(dev, sizeof(*scom), GFP_KERNEL);
98 scom->i2cr = to_fsi_master_i2cr(fsi_dev->slave->master);
99 dev_set_drvdata(dev, scom);
101 scom->dev.type = &fsi_cdev_type;
102 scom->dev.parent = dev;
103 device_initialize(&scom->dev);
105 ret = fsi_get_new_minor(fsi_dev, fsi_dev_scom, &scom->dev.devt, &didx);
109 dev_set_name(&scom->dev, "scom%d", didx);
110 cdev_init(&scom->cdev, &i2cr_scom_fops);
111 ret = cdev_device_add(&scom->cdev, &scom->dev);
113 fsi_free_minor(scom->dev.devt);
118 static int i2cr_scom_remove(struct device *dev)
120 struct i2cr_scom *scom = dev_get_drvdata(dev);
122 cdev_device_del(&scom->cdev, &scom->dev);
123 fsi_free_minor(scom->dev.devt);
128 static const struct of_device_id i2cr_scom_of_ids[] = {
129 { .compatible = "ibm,i2cr-scom" },
132 MODULE_DEVICE_TABLE(of, i2cr_scom_of_ids);
134 static const struct fsi_device_id i2cr_scom_ids[] = {
135 { 0x5, FSI_VERSION_ANY },
139 static struct fsi_driver i2cr_scom_driver = {
140 .id_table = i2cr_scom_ids,
143 .bus = &fsi_bus_type,
144 .of_match_table = i2cr_scom_of_ids,
145 .probe = i2cr_scom_probe,
146 .remove = i2cr_scom_remove,
150 module_fsi_driver(i2cr_scom_driver);
152 MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
153 MODULE_DESCRIPTION("IBM I2C Responder SCOM driver");
154 MODULE_LICENSE("GPL");