// SPDX-License-Identifier: GPL-2.0-only /* * drivers/mfd/si476x-prop.c -- Subroutines to access * properties of si476x chips * * Copyright (C) 2012 Innovative Converged Devices(ICD) * Copyright (C) 2013 Andrey Smirnov * * Author: Andrey Smirnov <andrew.smirnov@gmail.com> */ #include <linux/module.h> #include <linux/mfd/si476x-core.h> struct si476x_property_range { u16 low, high; }; static bool si476x_core_element_is_in_array(u16 element, const u16 array[], size_t size) { int i; for (i = 0; i < size; i++) if (element == array[i]) return true; return false; } static bool si476x_core_element_is_in_range(u16 element, const struct si476x_property_range range[], size_t size) { int i; for (i = 0; i < size; i++) if (element <= range[i].high && element >= range[i].low) return true; return false; } static bool si476x_core_is_valid_property_a10(struct si476x_core *core, u16 property) { static const u16 valid_properties[] = { 0x0000, 0x0500, 0x0501, 0x0600, 0x0709, 0x070C, 0x070D, 0x70E, 0x710, 0x0718, 0x1207, 0x1208, 0x2007, 0x2300, }; static const struct si476x_property_range valid_ranges[] = { { 0x0200, 0x0203 }, { 0x0300, 0x0303 }, { 0x0400, 0x0404 }, { 0x0700, 0x0707 }, { 0x1100, 0x1102 }, { 0x1200, 0x1204 }, { 0x1300, 0x1306 }, { 0x2000, 0x2005 }, { 0x2100, 0x2104 }, { 0x2106, 0x2106 }, { 0x2200, 0x220E }, { 0x3100, 0x3104 }, { 0x3207, 0x320F }, { 0x3300, 0x3304 }, { 0x3500, 0x3517 }, { 0x3600, 0x3617 }, { 0x3700, 0x3717 }, { 0x4000, 0x4003 }, }; return si476x_core_element_is_in_range(property, valid_ranges, ARRAY_SIZE(valid_ranges)) || si476x_core_element_is_in_array(property, valid_properties, ARRAY_SIZE(valid_properties)); } static bool si476x_core_is_valid_property_a20(struct si476x_core *core, u16 property) { static const u16 valid_properties[] = { 0x071B, 0x1006, 0x2210, 0x3401, }; static const struct si476x_property_range valid_ranges[] = { { 0x2215, 0x2219 }, }; return si476x_core_is_valid_property_a10(core, property) || si476x_core_element_is_in_range(property, valid_ranges, ARRAY_SIZE(valid_ranges)) || si476x_core_element_is_in_array(property, valid_properties, ARRAY_SIZE(valid_properties)); } static bool si476x_core_is_valid_property_a30(struct si476x_core *core, u16 property) { static const u16 valid_properties[] = { 0x071C, 0x071D, 0x1007, 0x1008, 0x220F, 0x2214, 0x2301, 0x3105, 0x3106, 0x3402, }; static const struct si476x_property_range valid_ranges[] = { { 0x0405, 0x0411 }, { 0x2008, 0x200B }, { 0x2220, 0x2223 }, { 0x3100, 0x3106 }, }; return si476x_core_is_valid_property_a20(core, property) || si476x_core_element_is_in_range(property, valid_ranges, ARRAY_SIZE(valid_ranges)) || si476x_core_element_is_in_array(property, valid_properties, ARRAY_SIZE(valid_properties)); } typedef bool (*valid_property_pred_t) (struct si476x_core *, u16); static bool si476x_core_is_valid_property(struct si476x_core *core, u16 property) { static const valid_property_pred_t is_valid_property[] = { [SI476X_REVISION_A10] = si476x_core_is_valid_property_a10, [SI476X_REVISION_A20] = si476x_core_is_valid_property_a20, [SI476X_REVISION_A30] = si476x_core_is_valid_property_a30, }; BUG_ON(core->revision > SI476X_REVISION_A30 || core->revision == -1); return is_valid_property[core->revision](core, property); } static bool si476x_core_is_readonly_property(struct si476x_core *core, u16 property) { BUG_ON(core->revision > SI476X_REVISION_A30 || core->revision == -1); switch (core->revision) { case SI476X_REVISION_A10: return (property == 0x3200); case SI476X_REVISION_A20: return (property == 0x1006 || property == 0x2210 || property == 0x3200); case SI476X_REVISION_A30: return false; } return false; } static bool si476x_core_regmap_readable_register(struct device *dev, unsigned int reg) { struct i2c_client *client = to_i2c_client(dev); struct si476x_core *core = i2c_get_clientdata(client); return si476x_core_is_valid_property(core, (u16) reg); } static bool si476x_core_regmap_writable_register(struct device *dev, unsigned int reg) { struct i2c_client *client = to_i2c_client(dev); struct si476x_core *core = i2c_get_clientdata(client); return si476x_core_is_valid_property(core, (u16) reg) && !si476x_core_is_readonly_property(core, (u16) reg); } static int si476x_core_regmap_write(void *context, unsigned int reg, unsigned int val) { return si476x_core_cmd_set_property(context, reg, val); } static int si476x_core_regmap_read(void *context, unsigned int reg, unsigned *val) { struct si476x_core *core = context; int err; err = si476x_core_cmd_get_property(core, reg); if (err < 0) return err; *val = err; return 0; } static const struct regmap_config si476x_regmap_config = { .reg_bits = 16, .val_bits = 16, .max_register = 0x4003, .writeable_reg = si476x_core_regmap_writable_register, .readable_reg = si476x_core_regmap_readable_register, .reg_read = si476x_core_regmap_read, .reg_write = si476x_core_regmap_write, .cache_type = REGCACHE_MAPLE, }; struct regmap *devm_regmap_init_si476x(struct si476x_core *core) { return devm_regmap_init(&core->client->dev, NULL, core, &si476x_regmap_config); } EXPORT_SYMBOL_GPL(devm_regmap_init_si476x);