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 <dm/of_access.h> 17 #include <power/pmic.h> 18 #include <linux/ctype.h> 19 20 DECLARE_GLOBAL_DATA_PTR; 21 22 #if CONFIG_IS_ENABLED(PMIC_CHILDREN) 23 int pmic_bind_children(struct udevice *pmic, ofnode parent, 24 const struct pmic_child_info *child_info) 25 { 26 const struct pmic_child_info *info; 27 struct driver *drv; 28 struct udevice *child; 29 const char *node_name; 30 const char *reg_name; 31 int bind_count = 0; 32 ofnode node; 33 int ret; 34 bool enable; 35 36 debug("%s for '%s' at node offset: %d\n", __func__, pmic->name, 37 dev_of_offset(pmic)); 38 39 ofnode_for_each_subnode(node, parent) { 40 node_name = ofnode_get_name(node); 41 42 debug("* Found child node: '%s'\n", node_name); 43 44 if (ofnode_is_np(node)) 45 enable = of_device_is_available(ofnode_to_np(node)); 46 else 47 enable = fdtdec_get_is_enabled(gd->fdt_blob, 48 ofnode_to_offset(node)); 49 if (!enable) { 50 debug("* But '%s' is disabled\n", node_name); 51 continue; 52 } 53 54 child = NULL; 55 for (info = child_info; info->prefix && info->driver; info++) { 56 debug(" - compatible prefix: '%s'\n", info->prefix); 57 58 if (!strstr(node_name, info->prefix)) { 59 reg_name = ofnode_read_string(node, 60 "regulator-name"); 61 if (!reg_name) 62 continue; 63 if (!strstr(reg_name, info->prefix)) 64 continue; 65 } 66 67 drv = lists_driver_lookup_name(info->driver); 68 if (!drv) { 69 debug(" - driver: '%s' not found!\n", 70 info->driver); 71 continue; 72 } 73 74 debug(" - found child driver: '%s'\n", drv->name); 75 76 ret = device_bind_with_driver_data(pmic, drv, node_name, 77 0, node, &child); 78 if (ret) { 79 debug(" - child binding error: %d\n", ret); 80 continue; 81 } 82 83 debug(" - bound child device: '%s'\n", child->name); 84 85 child->driver_data = trailing_strtol(node_name); 86 87 debug(" - set 'child->driver_data': %lu\n", 88 child->driver_data); 89 break; 90 } 91 92 if (child) 93 bind_count++; 94 else 95 debug(" - compatible prefix not found\n"); 96 } 97 98 debug("Bound: %d children for PMIC: '%s'\n", bind_count, pmic->name); 99 return bind_count; 100 } 101 #endif 102 103 int pmic_get(const char *name, struct udevice **devp) 104 { 105 return uclass_get_device_by_name(UCLASS_PMIC, name, devp); 106 } 107 108 int pmic_reg_count(struct udevice *dev) 109 { 110 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 111 112 if (!ops || !ops->reg_count) 113 return -ENOSYS; 114 115 return ops->reg_count(dev); 116 } 117 118 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len) 119 { 120 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 121 122 if (!buffer) 123 return -EFAULT; 124 125 if (!ops || !ops->read) 126 return -ENOSYS; 127 128 return ops->read(dev, reg, buffer, len); 129 } 130 131 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len) 132 { 133 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 134 135 if (!buffer) 136 return -EFAULT; 137 138 if (!ops || !ops->write) 139 return -ENOSYS; 140 141 return ops->write(dev, reg, buffer, len); 142 } 143 144 int pmic_reg_read(struct udevice *dev, uint reg) 145 { 146 u8 byte; 147 int ret; 148 149 debug("%s: reg=%x", __func__, reg); 150 ret = pmic_read(dev, reg, &byte, 1); 151 debug(", value=%x, ret=%d\n", byte, ret); 152 153 return ret ? ret : byte; 154 } 155 156 int pmic_reg_write(struct udevice *dev, uint reg, uint value) 157 { 158 u8 byte = value; 159 int ret; 160 161 debug("%s: reg=%x, value=%x", __func__, reg, value); 162 ret = pmic_write(dev, reg, &byte, 1); 163 debug(", ret=%d\n", ret); 164 165 return ret; 166 } 167 168 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set) 169 { 170 u8 byte; 171 int ret; 172 173 ret = pmic_reg_read(dev, reg); 174 if (ret < 0) 175 return ret; 176 byte = (ret & ~clr) | set; 177 178 return pmic_reg_write(dev, reg, byte); 179 } 180 181 182 int pmic_shutdown(struct udevice *dev) 183 { 184 const struct dm_pmic_ops *ops = dev_get_driver_ops(dev); 185 186 if (!ops || !ops->shutdown) 187 return -ENOSYS; 188 189 return ops->shutdown(dev); 190 } 191 192 UCLASS_DRIVER(pmic) = { 193 .id = UCLASS_PMIC, 194 .name = "pmic", 195 }; 196