| 1 | /* |
| 2 | * drivers/mfd/si476x-prop.c -- Subroutines to access |
| 3 | * properties of si476x chips |
| 4 | * |
| 5 | * Copyright (C) 2012 Innovative Converged Devices(ICD) |
| 6 | * Copyright (C) 2013 Andrey Smirnov |
| 7 | * |
| 8 | * Author: Andrey Smirnov <andrew.smirnov@gmail.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; version 2 of the License. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | */ |
| 19 | #include <linux/module.h> |
| 20 | |
| 21 | #include <linux/mfd/si476x-core.h> |
| 22 | |
| 23 | struct si476x_property_range { |
| 24 | u16 low, high; |
| 25 | }; |
| 26 | |
| 27 | static bool si476x_core_element_is_in_array(u16 element, |
| 28 | const u16 array[], |
| 29 | size_t size) |
| 30 | { |
| 31 | int i; |
| 32 | |
| 33 | for (i = 0; i < size; i++) |
| 34 | if (element == array[i]) |
| 35 | return true; |
| 36 | |
| 37 | return false; |
| 38 | } |
| 39 | |
| 40 | static bool si476x_core_element_is_in_range(u16 element, |
| 41 | const struct si476x_property_range range[], |
| 42 | size_t size) |
| 43 | { |
| 44 | int i; |
| 45 | |
| 46 | for (i = 0; i < size; i++) |
| 47 | if (element <= range[i].high && element >= range[i].low) |
| 48 | return true; |
| 49 | |
| 50 | return false; |
| 51 | } |
| 52 | |
| 53 | static bool si476x_core_is_valid_property_a10(struct si476x_core *core, |
| 54 | u16 property) |
| 55 | { |
| 56 | static const u16 valid_properties[] = { |
| 57 | 0x0000, |
| 58 | 0x0500, 0x0501, |
| 59 | 0x0600, |
| 60 | 0x0709, 0x070C, 0x070D, 0x70E, 0x710, |
| 61 | 0x0718, |
| 62 | 0x1207, 0x1208, |
| 63 | 0x2007, |
| 64 | 0x2300, |
| 65 | }; |
| 66 | |
| 67 | static const struct si476x_property_range valid_ranges[] = { |
| 68 | { 0x0200, 0x0203 }, |
| 69 | { 0x0300, 0x0303 }, |
| 70 | { 0x0400, 0x0404 }, |
| 71 | { 0x0700, 0x0707 }, |
| 72 | { 0x1100, 0x1102 }, |
| 73 | { 0x1200, 0x1204 }, |
| 74 | { 0x1300, 0x1306 }, |
| 75 | { 0x2000, 0x2005 }, |
| 76 | { 0x2100, 0x2104 }, |
| 77 | { 0x2106, 0x2106 }, |
| 78 | { 0x2200, 0x220E }, |
| 79 | { 0x3100, 0x3104 }, |
| 80 | { 0x3207, 0x320F }, |
| 81 | { 0x3300, 0x3304 }, |
| 82 | { 0x3500, 0x3517 }, |
| 83 | { 0x3600, 0x3617 }, |
| 84 | { 0x3700, 0x3717 }, |
| 85 | { 0x4000, 0x4003 }, |
| 86 | }; |
| 87 | |
| 88 | return si476x_core_element_is_in_range(property, valid_ranges, |
| 89 | ARRAY_SIZE(valid_ranges)) || |
| 90 | si476x_core_element_is_in_array(property, valid_properties, |
| 91 | ARRAY_SIZE(valid_properties)); |
| 92 | } |
| 93 | |
| 94 | static bool si476x_core_is_valid_property_a20(struct si476x_core *core, |
| 95 | u16 property) |
| 96 | { |
| 97 | static const u16 valid_properties[] = { |
| 98 | 0x071B, |
| 99 | 0x1006, |
| 100 | 0x2210, |
| 101 | 0x3401, |
| 102 | }; |
| 103 | |
| 104 | static const struct si476x_property_range valid_ranges[] = { |
| 105 | { 0x2215, 0x2219 }, |
| 106 | }; |
| 107 | |
| 108 | return si476x_core_is_valid_property_a10(core, property) || |
| 109 | si476x_core_element_is_in_range(property, valid_ranges, |
| 110 | ARRAY_SIZE(valid_ranges)) || |
| 111 | si476x_core_element_is_in_array(property, valid_properties, |
| 112 | ARRAY_SIZE(valid_properties)); |
| 113 | } |
| 114 | |
| 115 | static bool si476x_core_is_valid_property_a30(struct si476x_core *core, |
| 116 | u16 property) |
| 117 | { |
| 118 | static const u16 valid_properties[] = { |
| 119 | 0x071C, 0x071D, |
| 120 | 0x1007, 0x1008, |
| 121 | 0x220F, 0x2214, |
| 122 | 0x2301, |
| 123 | 0x3105, 0x3106, |
| 124 | 0x3402, |
| 125 | }; |
| 126 | |
| 127 | static const struct si476x_property_range valid_ranges[] = { |
| 128 | { 0x0405, 0x0411 }, |
| 129 | { 0x2008, 0x200B }, |
| 130 | { 0x2220, 0x2223 }, |
| 131 | { 0x3100, 0x3106 }, |
| 132 | }; |
| 133 | |
| 134 | return si476x_core_is_valid_property_a20(core, property) || |
| 135 | si476x_core_element_is_in_range(property, valid_ranges, |
| 136 | ARRAY_SIZE(valid_ranges)) || |
| 137 | si476x_core_element_is_in_array(property, valid_properties, |
| 138 | ARRAY_SIZE(valid_properties)); |
| 139 | } |
| 140 | |
| 141 | typedef bool (*valid_property_pred_t) (struct si476x_core *, u16); |
| 142 | |
| 143 | static bool si476x_core_is_valid_property(struct si476x_core *core, |
| 144 | u16 property) |
| 145 | { |
| 146 | static const valid_property_pred_t is_valid_property[] = { |
| 147 | [SI476X_REVISION_A10] = si476x_core_is_valid_property_a10, |
| 148 | [SI476X_REVISION_A20] = si476x_core_is_valid_property_a20, |
| 149 | [SI476X_REVISION_A30] = si476x_core_is_valid_property_a30, |
| 150 | }; |
| 151 | |
| 152 | BUG_ON(core->revision > SI476X_REVISION_A30 || |
| 153 | core->revision == -1); |
| 154 | return is_valid_property[core->revision](core, property); |
| 155 | } |
| 156 | |
| 157 | |
| 158 | static bool si476x_core_is_readonly_property(struct si476x_core *core, |
| 159 | u16 property) |
| 160 | { |
| 161 | BUG_ON(core->revision > SI476X_REVISION_A30 || |
| 162 | core->revision == -1); |
| 163 | |
| 164 | switch (core->revision) { |
| 165 | case SI476X_REVISION_A10: |
| 166 | return (property == 0x3200); |
| 167 | case SI476X_REVISION_A20: |
| 168 | return (property == 0x1006 || |
| 169 | property == 0x2210 || |
| 170 | property == 0x3200); |
| 171 | case SI476X_REVISION_A30: |
| 172 | return false; |
| 173 | } |
| 174 | |
| 175 | return false; |
| 176 | } |
| 177 | |
| 178 | static bool si476x_core_regmap_readable_register(struct device *dev, |
| 179 | unsigned int reg) |
| 180 | { |
| 181 | struct i2c_client *client = to_i2c_client(dev); |
| 182 | struct si476x_core *core = i2c_get_clientdata(client); |
| 183 | |
| 184 | return si476x_core_is_valid_property(core, (u16) reg); |
| 185 | |
| 186 | } |
| 187 | |
| 188 | static bool si476x_core_regmap_writable_register(struct device *dev, |
| 189 | unsigned int reg) |
| 190 | { |
| 191 | struct i2c_client *client = to_i2c_client(dev); |
| 192 | struct si476x_core *core = i2c_get_clientdata(client); |
| 193 | |
| 194 | return si476x_core_is_valid_property(core, (u16) reg) && |
| 195 | !si476x_core_is_readonly_property(core, (u16) reg); |
| 196 | } |
| 197 | |
| 198 | |
| 199 | static int si476x_core_regmap_write(void *context, unsigned int reg, |
| 200 | unsigned int val) |
| 201 | { |
| 202 | return si476x_core_cmd_set_property(context, reg, val); |
| 203 | } |
| 204 | |
| 205 | static int si476x_core_regmap_read(void *context, unsigned int reg, |
| 206 | unsigned *val) |
| 207 | { |
| 208 | struct si476x_core *core = context; |
| 209 | int err; |
| 210 | |
| 211 | err = si476x_core_cmd_get_property(core, reg); |
| 212 | if (err < 0) |
| 213 | return err; |
| 214 | |
| 215 | *val = err; |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | |
| 221 | static const struct regmap_config si476x_regmap_config = { |
| 222 | .reg_bits = 16, |
| 223 | .val_bits = 16, |
| 224 | |
| 225 | .max_register = 0x4003, |
| 226 | |
| 227 | .writeable_reg = si476x_core_regmap_writable_register, |
| 228 | .readable_reg = si476x_core_regmap_readable_register, |
| 229 | |
| 230 | .reg_read = si476x_core_regmap_read, |
| 231 | .reg_write = si476x_core_regmap_write, |
| 232 | |
| 233 | .cache_type = REGCACHE_RBTREE, |
| 234 | }; |
| 235 | |
| 236 | struct regmap *devm_regmap_init_si476x(struct si476x_core *core) |
| 237 | { |
| 238 | return devm_regmap_init(&core->client->dev, NULL, |
| 239 | core, &si476x_regmap_config); |
| 240 | } |
| 241 | EXPORT_SYMBOL_GPL(devm_regmap_init_si476x); |