| /* |
| * Google LWIS PHY Interface |
| * |
| * Copyright (c) 2018 Google, LLC |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME "-phy: " fmt |
| |
| #include "lwis_phy.h" |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| |
| struct lwis_phy_list *lwis_phy_list_alloc(int count) |
| { |
| struct lwis_phy_list *list; |
| |
| /* No need to allocate if count is invalid */ |
| if (count <= 0) { |
| return ERR_PTR(-EINVAL); |
| } |
| |
| list = kmalloc(sizeof(struct lwis_phy_list), GFP_KERNEL); |
| if (!list) { |
| pr_err("Failed to allocate PHY list\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| list->phy = kzalloc(count * sizeof(struct phy), GFP_KERNEL); |
| if (!list->phy) { |
| pr_err("Failed to allocate PHY instances\n"); |
| kfree(list); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| list->count = count; |
| |
| return list; |
| } |
| |
| void lwis_phy_list_free(struct lwis_phy_list *list) |
| { |
| if (!list) { |
| return; |
| } |
| |
| if (list->phy) { |
| kfree(list->phy); |
| } |
| |
| kfree(list); |
| } |
| |
| int lwis_phy_get(struct lwis_phy_list *list, char *name, struct device *dev) |
| { |
| struct phy *phy; |
| int i; |
| int index = -1; |
| |
| if (!list || !dev) { |
| return -EINVAL; |
| } |
| |
| /* Look for empty slot and duplicate entries */ |
| for (i = 0; i < list->count; ++i) { |
| if (list->phy[i].phy == NULL) { |
| index = i; |
| } else if (!strcmp(list->phy[i].name, name)) { |
| pr_info("PHY %s already allocated\n", name); |
| return i; |
| } |
| } |
| |
| /* No empty slots */ |
| if (index < 0) { |
| pr_err("No empty slots in the lwis_phy struct\n"); |
| return -ENOMEM; |
| } |
| |
| /* Make sure PHY exists */ |
| phy = devm_phy_get(dev, name); |
| if (IS_ERR(phy)) { |
| pr_err("PHY %s not found\n", name); |
| return PTR_ERR(phy); |
| } |
| |
| list->phy[index].phy = phy; |
| list->phy[index].name = name; |
| |
| return index; |
| } |
| |
| int lwis_phy_put_by_idx(struct lwis_phy_list *list, int index, struct device *dev) |
| { |
| if (!list || index < 0 || index >= list->count) { |
| return -EINVAL; |
| } |
| |
| if (IS_ERR_OR_NULL(list->phy[index].phy)) { |
| return -EINVAL; |
| } |
| |
| devm_phy_put(dev, list->phy[index].phy); |
| memset(list->phy + index, 0, sizeof(struct lwis_phy)); |
| |
| return 0; |
| } |
| |
| int lwis_phy_put_by_name(struct lwis_phy_list *list, char *name, struct device *dev) |
| { |
| int i; |
| |
| if (!dev || !list) { |
| return -EINVAL; |
| } |
| |
| /* Find entry by name */ |
| for (i = 0; i < list->count; ++i) { |
| if (!strcmp(list->phy[i].name, name)) { |
| if (IS_ERR_OR_NULL(list->phy[i].phy)) { |
| return -EINVAL; |
| } |
| devm_phy_put(dev, list->phy[i].phy); |
| memset(list->phy + i, 0, sizeof(struct lwis_phy)); |
| return 0; |
| } |
| } |
| |
| pr_err("PHY %s not found\n", name); |
| return -EINVAL; |
| } |
| |
| int lwis_phy_set_power_by_idx(struct lwis_phy_list *list, int index, bool power_on) |
| { |
| if (!list || index < 0 || index >= list->count) { |
| return -EINVAL; |
| } |
| |
| if (power_on) { |
| return phy_power_on(list->phy[index].phy); |
| } |
| |
| return phy_power_off(list->phy[index].phy); |
| } |
| |
| int lwis_phy_set_power_by_name(struct lwis_phy_list *list, char *name, bool power_on) |
| { |
| int i; |
| |
| if (!list) { |
| return -EINVAL; |
| } |
| |
| /* Find entry by name */ |
| for (i = 0; i < list->count; ++i) { |
| if (!strcmp(list->phy[i].name, name)) { |
| return lwis_phy_set_power_by_idx(list, i, power_on); |
| } |
| } |
| |
| /* Entry not found */ |
| pr_err("PHY %s not found\n", name); |
| return -ENOENT; |
| } |
| |
| int lwis_phy_set_power_all(struct lwis_phy_list *list, bool power_on) |
| { |
| int i; |
| int ret; |
| |
| if (!list) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < list->count; ++i) { |
| ret = lwis_phy_set_power_by_idx(list, i, power_on); |
| if (ret) { |
| pr_err("Failed to set PHY power\n"); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| void lwis_phy_print(struct lwis_phy_list *list) |
| { |
| int i; |
| |
| for (i = 0; i < list->count; ++i) { |
| pr_info("%s: PHY: %s\n", __func__, list->phy[i].name); |
| } |
| } |