1 /* 2 * Copyright (C) 2014-2015 Samsung Electronics 3 * Przemyslaw Marczak <p.marczak@samsung.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <fdtdec.h> 10 #include <errno.h> 11 #include <dm.h> 12 #include <vsprintf.h> 13 #include <dm/lists.h> 14 #include <dm/device-internal.h> 15 #include <dm/uclass-internal.h> 16 #include <power/pmic.h> 17 #include <linux/ctype.h> 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 #if CONFIG_IS_ENABLED(PMIC_CHILDREN) 22 int pmic_bind_children(struct udevice *pmic, ofnode parent, 23 const struct pmic_child_info *child_info) 24 { 25 const struct pmic_child_info *info; 26 struct driver *drv; 27 struct udevice *child; 28 const char *node_name; 29 int bind_count = 0; 30 ofnode node; 31 int prefix_len; 32 int ret; 33 34 debug("%s for '%s' at node offset: %d\n", __func__, pmic->name, 35 dev_of_offset(pmic)); 36 37 ofnode_for_each_subnode(node, parent) { 38 node_name = ofnode_get_name(node); 39 40 debug("* Found child node: '%s'\n", node_name); 41 42 child = NULL; 43 for (info = child_info; info->prefix && info->driver; info++) { 44 debug(" - compatible prefix: '%s'\n", info->prefix); 45 46 prefix_len = strlen(info->prefix); 47 if (strncmp(info->prefix, node_name, prefix_len)) 48 continue; 49 50 drv = lists_driver_lookup_name(info->driver); 51 if (!drv) { 52 debug(" - driver: '%s' not found!\n", 53 info->driver); 54 continue; 55 } 56 57 debug(" - found child driver: '%s'\n", drv->name); 58 59 ret = device_bind_with_driver_data(pmic, drv, node_name, 60 0, node, &child); 61 if (ret) { 62 debug(" - child binding error: %d\n", ret); 63 continue; 64 } 65 66 debug(" - bound child device: '%s'\n", child->name); 67 68 child->driver_data = trailing_strtol(node_name); 69 70 debug(" - set 'child->driver_data': %lu\n", 71 child->driver_data); 72 break; 73 } 74 75 if (child) 76 bind_count++; 77 else 78 debug(" - compatible prefix not found\n"); 79 } 80 81 debug("Bound: %d children for PMIC: '%s'\n", bind_count, pmic->name); 82 return bind_count; 83 } 84 #endif 85 86 int pmic_get(const char *name, struct udevice **devp) 87 { 88 return uclass_get_device_by_name(UCLASS_PMIC, name, devp); 89 } 90 91 int pmic_reg_count(struct udevice *dev) 92 { 93 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 94 95 if (!ops || !ops->reg_count) 96 return -ENOSYS; 97 98 return ops->reg_count(dev); 99 } 100 101 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len) 102 { 103 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 104 105 if (!buffer) 106 return -EFAULT; 107 108 if (!ops || !ops->read) 109 return -ENOSYS; 110 111 return ops->read(dev, reg, buffer, len); 112 } 113 114 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len) 115 { 116 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 117 118 if (!buffer) 119 return -EFAULT; 120 121 if (!ops || !ops->write) 122 return -ENOSYS; 123 124 return ops->write(dev, reg, buffer, len); 125 } 126 127 int pmic_reg_read(struct udevice *dev, uint reg) 128 { 129 u8 byte; 130 int ret; 131 132 debug("%s: reg=%x", __func__, reg); 133 ret = pmic_read(dev, reg, &byte, 1); 134 debug(", value=%x, ret=%d\n", byte, ret); 135 136 return ret ? ret : byte; 137 } 138 139 int pmic_reg_write(struct udevice *dev, uint reg, uint value) 140 { 141 u8 byte = value; 142 int ret; 143 144 debug("%s: reg=%x, value=%x", __func__, reg, value); 145 ret = pmic_write(dev, reg, &byte, 1); 146 debug(", ret=%d\n", ret); 147 148 return ret; 149 } 150 151 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set) 152 { 153 u8 byte; 154 int ret; 155 156 ret = pmic_reg_read(dev, reg); 157 if (ret < 0) 158 return ret; 159 byte = (ret & ~clr) | set; 160 161 return pmic_reg_write(dev, reg, byte); 162 } 163 164 UCLASS_DRIVER(pmic) = { 165 .id = UCLASS_PMIC, 166 .name = "pmic", 167 }; 168