1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/mfd/si476x-prop.c -- Subroutines to access 4 * properties of si476x chips 5 * 6 * Copyright (C) 2012 Innovative Converged Devices(ICD) 7 * Copyright (C) 2013 Andrey Smirnov 8 * 9 * Author: Andrey Smirnov <andrew.smirnov@gmail.com> 10 */ 11 #include <linux/module.h> 12 13 #include <linux/mfd/si476x-core.h> 14 15 struct si476x_property_range { 16 u16 low, high; 17 }; 18 19 static bool si476x_core_element_is_in_array(u16 element, 20 const u16 array[], 21 size_t size) 22 { 23 int i; 24 25 for (i = 0; i < size; i++) 26 if (element == array[i]) 27 return true; 28 29 return false; 30 } 31 32 static bool si476x_core_element_is_in_range(u16 element, 33 const struct si476x_property_range range[], 34 size_t size) 35 { 36 int i; 37 38 for (i = 0; i < size; i++) 39 if (element <= range[i].high && element >= range[i].low) 40 return true; 41 42 return false; 43 } 44 45 static bool si476x_core_is_valid_property_a10(struct si476x_core *core, 46 u16 property) 47 { 48 static const u16 valid_properties[] = { 49 0x0000, 50 0x0500, 0x0501, 51 0x0600, 52 0x0709, 0x070C, 0x070D, 0x70E, 0x710, 53 0x0718, 54 0x1207, 0x1208, 55 0x2007, 56 0x2300, 57 }; 58 59 static const struct si476x_property_range valid_ranges[] = { 60 { 0x0200, 0x0203 }, 61 { 0x0300, 0x0303 }, 62 { 0x0400, 0x0404 }, 63 { 0x0700, 0x0707 }, 64 { 0x1100, 0x1102 }, 65 { 0x1200, 0x1204 }, 66 { 0x1300, 0x1306 }, 67 { 0x2000, 0x2005 }, 68 { 0x2100, 0x2104 }, 69 { 0x2106, 0x2106 }, 70 { 0x2200, 0x220E }, 71 { 0x3100, 0x3104 }, 72 { 0x3207, 0x320F }, 73 { 0x3300, 0x3304 }, 74 { 0x3500, 0x3517 }, 75 { 0x3600, 0x3617 }, 76 { 0x3700, 0x3717 }, 77 { 0x4000, 0x4003 }, 78 }; 79 80 return si476x_core_element_is_in_range(property, valid_ranges, 81 ARRAY_SIZE(valid_ranges)) || 82 si476x_core_element_is_in_array(property, valid_properties, 83 ARRAY_SIZE(valid_properties)); 84 } 85 86 static bool si476x_core_is_valid_property_a20(struct si476x_core *core, 87 u16 property) 88 { 89 static const u16 valid_properties[] = { 90 0x071B, 91 0x1006, 92 0x2210, 93 0x3401, 94 }; 95 96 static const struct si476x_property_range valid_ranges[] = { 97 { 0x2215, 0x2219 }, 98 }; 99 100 return si476x_core_is_valid_property_a10(core, property) || 101 si476x_core_element_is_in_range(property, valid_ranges, 102 ARRAY_SIZE(valid_ranges)) || 103 si476x_core_element_is_in_array(property, valid_properties, 104 ARRAY_SIZE(valid_properties)); 105 } 106 107 static bool si476x_core_is_valid_property_a30(struct si476x_core *core, 108 u16 property) 109 { 110 static const u16 valid_properties[] = { 111 0x071C, 0x071D, 112 0x1007, 0x1008, 113 0x220F, 0x2214, 114 0x2301, 115 0x3105, 0x3106, 116 0x3402, 117 }; 118 119 static const struct si476x_property_range valid_ranges[] = { 120 { 0x0405, 0x0411 }, 121 { 0x2008, 0x200B }, 122 { 0x2220, 0x2223 }, 123 { 0x3100, 0x3106 }, 124 }; 125 126 return si476x_core_is_valid_property_a20(core, property) || 127 si476x_core_element_is_in_range(property, valid_ranges, 128 ARRAY_SIZE(valid_ranges)) || 129 si476x_core_element_is_in_array(property, valid_properties, 130 ARRAY_SIZE(valid_properties)); 131 } 132 133 typedef bool (*valid_property_pred_t) (struct si476x_core *, u16); 134 135 static bool si476x_core_is_valid_property(struct si476x_core *core, 136 u16 property) 137 { 138 static const valid_property_pred_t is_valid_property[] = { 139 [SI476X_REVISION_A10] = si476x_core_is_valid_property_a10, 140 [SI476X_REVISION_A20] = si476x_core_is_valid_property_a20, 141 [SI476X_REVISION_A30] = si476x_core_is_valid_property_a30, 142 }; 143 144 BUG_ON(core->revision > SI476X_REVISION_A30 || 145 core->revision == -1); 146 return is_valid_property[core->revision](core, property); 147 } 148 149 150 static bool si476x_core_is_readonly_property(struct si476x_core *core, 151 u16 property) 152 { 153 BUG_ON(core->revision > SI476X_REVISION_A30 || 154 core->revision == -1); 155 156 switch (core->revision) { 157 case SI476X_REVISION_A10: 158 return (property == 0x3200); 159 case SI476X_REVISION_A20: 160 return (property == 0x1006 || 161 property == 0x2210 || 162 property == 0x3200); 163 case SI476X_REVISION_A30: 164 return false; 165 } 166 167 return false; 168 } 169 170 static bool si476x_core_regmap_readable_register(struct device *dev, 171 unsigned int reg) 172 { 173 struct i2c_client *client = to_i2c_client(dev); 174 struct si476x_core *core = i2c_get_clientdata(client); 175 176 return si476x_core_is_valid_property(core, (u16) reg); 177 178 } 179 180 static bool si476x_core_regmap_writable_register(struct device *dev, 181 unsigned int reg) 182 { 183 struct i2c_client *client = to_i2c_client(dev); 184 struct si476x_core *core = i2c_get_clientdata(client); 185 186 return si476x_core_is_valid_property(core, (u16) reg) && 187 !si476x_core_is_readonly_property(core, (u16) reg); 188 } 189 190 191 static int si476x_core_regmap_write(void *context, unsigned int reg, 192 unsigned int val) 193 { 194 return si476x_core_cmd_set_property(context, reg, val); 195 } 196 197 static int si476x_core_regmap_read(void *context, unsigned int reg, 198 unsigned *val) 199 { 200 struct si476x_core *core = context; 201 int err; 202 203 err = si476x_core_cmd_get_property(core, reg); 204 if (err < 0) 205 return err; 206 207 *val = err; 208 209 return 0; 210 } 211 212 213 static const struct regmap_config si476x_regmap_config = { 214 .reg_bits = 16, 215 .val_bits = 16, 216 217 .max_register = 0x4003, 218 219 .writeable_reg = si476x_core_regmap_writable_register, 220 .readable_reg = si476x_core_regmap_readable_register, 221 222 .reg_read = si476x_core_regmap_read, 223 .reg_write = si476x_core_regmap_write, 224 225 .cache_type = REGCACHE_RBTREE, 226 }; 227 228 struct regmap *devm_regmap_init_si476x(struct si476x_core *core) 229 { 230 return devm_regmap_init(&core->client->dev, NULL, 231 core, &si476x_regmap_config); 232 } 233 EXPORT_SYMBOL_GPL(devm_regmap_init_si476x); 234