/* * Copyright 2019 Broadcom. * The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. * * 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. * * * A pddf kernel module to create I2C client for a CPLD */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pddf_client_defs.h" #include "pddf_cpld_defs.h" PDDF_CPLD_DATA pddf_cpld_data={0}; EXPORT_SYMBOL(pddf_cpld_data); static ssize_t do_device_operation(struct device *dev, struct device_attribute *da, const char *buf, size_t count); static ssize_t store_pddf_cpld_data(struct device *dev, struct device_attribute *da, const char *buf, size_t count); static ssize_t show_pddf_cpld_data(struct device *dev, struct device_attribute *da, char *buf); extern void *get_device_table(char *name); extern void delete_device_table(char *name); /* MUX CLIENT DATA */ PDDF_DATA_ATTR(dev_ops, S_IWUSR, NULL, do_device_operation, PDDF_CHAR, 8, NULL, (void*)&pddf_data); PDDF_DATA_ATTR(reg_addr, S_IWUSR|S_IRUGO, show_pddf_cpld_data, store_pddf_cpld_data, PDDF_USHORT, sizeof(unsigned short), (void*)&pddf_cpld_data.reg_addr, NULL); static struct attribute *cpld_attributes[] = { &attr_dev_ops.dev_attr.attr, &attr_reg_addr.dev_attr.attr, NULL }; static const struct attribute_group pddf_cpld_client_data_group = { .attrs = cpld_attributes, }; static ssize_t store_pddf_cpld_data(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { int ret = 0; int num = 0; PDDF_ATTR *ptr = (PDDF_ATTR *)da; ret = kstrtoint(buf,16,&num); if (ret==0) { mutex_lock(&pddf_cpld_data.cpld_lock); *(unsigned short *)(ptr->addr) = (unsigned short)num; mutex_unlock(&pddf_cpld_data.cpld_lock); pddf_dbg(CPLD, KERN_ERR "Stored value: 0x%x, num: 0x%x\n", *(int*)(ptr->addr), num); } return count; } static ssize_t show_pddf_cpld_data(struct device *dev, struct device_attribute *da, char *buf) { int ret = 0; PDDF_ATTR *ptr = (PDDF_ATTR *)da; pddf_dbg(CPLD, KERN_ERR "[ READ ] DATA ATTR PTR TYPE:%d, ADDR=%p\n", ptr->type, ptr->addr); mutex_lock(&pddf_cpld_data.cpld_lock); ret = sprintf(buf, "0x%x\n", *(unsigned short *)(ptr->addr)); mutex_unlock(&pddf_cpld_data.cpld_lock); return ret; } static ssize_t do_device_operation(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { PDDF_ATTR *ptr = (PDDF_ATTR *)da; NEW_DEV_ATTR *device_ptr = (NEW_DEV_ATTR *)(ptr->data); struct i2c_adapter *adapter; static struct i2c_board_info board_info; struct i2c_client *client_ptr; char *pddf_cpld_name = NULL; if (strncmp(buf, "add", strlen(buf)-1)==0) { adapter = i2c_get_adapter(device_ptr->parent_bus); if (strncmp(device_ptr->dev_type, "i2c_cpld", strlen("i2c_cpld"))==0) { pddf_cpld_name = (char *)kzalloc(CPLD_CLIENT_NAME_LEN, GFP_KERNEL); if (pddf_cpld_name != NULL) strcpy(pddf_cpld_name, device_ptr->i2c_name); board_info = (struct i2c_board_info) { .platform_data = (void *)pddf_cpld_name, }; board_info.addr = device_ptr->dev_addr; strcpy(board_info.type, device_ptr->dev_type); client_ptr = i2c_new_client_device(adapter, &board_info); if (!IS_ERR(client_ptr)) { i2c_put_adapter(adapter); pddf_dbg(CPLD, KERN_ERR "Created %s client: 0x%p\n", device_ptr->i2c_name, (void *)client_ptr); add_device_table(device_ptr->i2c_name, (void*)client_ptr); } else { i2c_put_adapter(adapter); goto free_data; } } else { printk(KERN_ERR "%s: Unsupported type of cpld - unable to add i2c client\n", __FUNCTION__); } } else if (strncmp(buf, "delete", strlen(buf)-1)==0) { /*Get the i2c_client handle for the created client*/ client_ptr = (struct i2c_client *)get_device_table(device_ptr->i2c_name); if (client_ptr) { pddf_dbg(CPLD, KERN_ERR "Removing %s client: 0x%p\n", device_ptr->i2c_name, (void *)client_ptr); i2c_unregister_device(client_ptr); delete_device_table(device_ptr->i2c_name); } else { printk(KERN_ERR "Unable to get the client handle for %s\n", device_ptr->i2c_name); } } else { printk(KERN_ERR "PDDF_ERROR: %s: Invalid value for dev_ops %s", __FUNCTION__, buf); } goto clear_data; free_data: if (board_info.platform_data) kfree(board_info.platform_data); clear_data: /*TODO: free the device_ptr->data is dynamically allocated*/ memset(device_ptr, 0 , sizeof(NEW_DEV_ATTR)); return count; } static struct kobject *cpld_kobj; int __init cpld_data_init(void) { struct kobject *device_kobj; int ret = 0; pddf_dbg(CPLD, "CPLD_DATA MODULE.. init\n"); device_kobj = get_device_i2c_kobj(); if(!device_kobj) return -ENOMEM; cpld_kobj = kobject_create_and_add("cpld", device_kobj); if(!cpld_kobj) return -ENOMEM; ret = sysfs_create_group(cpld_kobj, &pddf_clients_data_group); if (ret) { kobject_put(cpld_kobj); return ret; } pddf_dbg(CPLD, "CREATED PDDF I2C CLIENTS CREATION SYSFS GROUP\n"); mutex_init(&pddf_cpld_data.cpld_lock); ret = sysfs_create_group(cpld_kobj, &pddf_cpld_client_data_group); if (ret) { sysfs_remove_group(cpld_kobj, &pddf_clients_data_group); kobject_put(cpld_kobj); return ret; } pddf_dbg(CPLD, "CREATED PDDF I2C CLIENTS CREATION SYSFS GROUP\n"); return ret; } void __exit cpld_data_exit(void) { pddf_dbg(CPLD, "CPLD_DATA MODULE.. exit\n"); sysfs_remove_group(cpld_kobj, &pddf_cpld_client_data_group); sysfs_remove_group(cpld_kobj, &pddf_clients_data_group); kobject_put(cpld_kobj); pddf_dbg(CPLD, KERN_ERR "%s: Removed the kobjects for 'cpld'\n",__FUNCTION__); return; } module_init(cpld_data_init); module_exit(cpld_data_exit); MODULE_AUTHOR("Broadcom"); MODULE_DESCRIPTION("cpld platform data"); MODULE_LICENSE("GPL");