mfd: si476x: Add chip properties handling code
This patch adds code related to manipulation of the properties of SI476X chips. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Andrey Smirnov
Samuel Ortiz
parent
730a30ab7f
commit
379550698c
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/*
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* drivers/mfd/si476x-prop.c -- Subroutines to access
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* properties of si476x chips
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*
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* Copyright (C) 2012 Innovative Converged Devices(ICD)
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* Copyright (C) 2013 Andrey Smirnov
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/mfd/si476x-core.h>
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struct si476x_property_range {
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u16 low, high;
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};
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static bool si476x_core_element_is_in_array(u16 element,
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const u16 array[],
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size_t size)
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{
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int i;
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for (i = 0; i < size; i++)
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if (element == array[i])
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return true;
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return false;
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}
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static bool si476x_core_element_is_in_range(u16 element,
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const struct si476x_property_range range[],
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size_t size)
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{
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int i;
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for (i = 0; i < size; i++)
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if (element <= range[i].high && element >= range[i].low)
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return true;
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return false;
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}
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static bool si476x_core_is_valid_property_a10(struct si476x_core *core,
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u16 property)
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{
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static const u16 valid_properties[] = {
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0x0000,
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0x0500, 0x0501,
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0x0600,
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0x0709, 0x070C, 0x070D, 0x70E, 0x710,
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0x0718,
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0x1207, 0x1208,
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0x2007,
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0x2300,
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};
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static const struct si476x_property_range valid_ranges[] = {
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{ 0x0200, 0x0203 },
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{ 0x0300, 0x0303 },
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{ 0x0400, 0x0404 },
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{ 0x0700, 0x0707 },
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{ 0x1100, 0x1102 },
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{ 0x1200, 0x1204 },
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{ 0x1300, 0x1306 },
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{ 0x2000, 0x2005 },
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{ 0x2100, 0x2104 },
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{ 0x2106, 0x2106 },
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{ 0x2200, 0x220E },
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{ 0x3100, 0x3104 },
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{ 0x3207, 0x320F },
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{ 0x3300, 0x3304 },
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{ 0x3500, 0x3517 },
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{ 0x3600, 0x3617 },
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{ 0x3700, 0x3717 },
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{ 0x4000, 0x4003 },
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};
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return si476x_core_element_is_in_range(property, valid_ranges,
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ARRAY_SIZE(valid_ranges)) ||
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si476x_core_element_is_in_array(property, valid_properties,
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ARRAY_SIZE(valid_properties));
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}
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static bool si476x_core_is_valid_property_a20(struct si476x_core *core,
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u16 property)
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{
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static const u16 valid_properties[] = {
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0x071B,
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0x1006,
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0x2210,
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0x3401,
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};
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static const struct si476x_property_range valid_ranges[] = {
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{ 0x2215, 0x2219 },
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};
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return si476x_core_is_valid_property_a10(core, property) ||
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si476x_core_element_is_in_range(property, valid_ranges,
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ARRAY_SIZE(valid_ranges)) ||
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si476x_core_element_is_in_array(property, valid_properties,
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ARRAY_SIZE(valid_properties));
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}
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static bool si476x_core_is_valid_property_a30(struct si476x_core *core,
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u16 property)
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{
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static const u16 valid_properties[] = {
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0x071C, 0x071D,
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0x1007, 0x1008,
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0x220F, 0x2214,
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0x2301,
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0x3105, 0x3106,
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0x3402,
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};
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static const struct si476x_property_range valid_ranges[] = {
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{ 0x0405, 0x0411 },
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{ 0x2008, 0x200B },
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{ 0x2220, 0x2223 },
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{ 0x3100, 0x3106 },
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};
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return si476x_core_is_valid_property_a20(core, property) ||
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si476x_core_element_is_in_range(property, valid_ranges,
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ARRAY_SIZE(valid_ranges)) ||
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si476x_core_element_is_in_array(property, valid_properties,
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ARRAY_SIZE(valid_properties));
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}
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typedef bool (*valid_property_pred_t) (struct si476x_core *, u16);
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static bool si476x_core_is_valid_property(struct si476x_core *core,
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u16 property)
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{
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static const valid_property_pred_t is_valid_property[] = {
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[SI476X_REVISION_A10] = si476x_core_is_valid_property_a10,
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[SI476X_REVISION_A20] = si476x_core_is_valid_property_a20,
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[SI476X_REVISION_A30] = si476x_core_is_valid_property_a30,
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};
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BUG_ON(core->revision > SI476X_REVISION_A30 ||
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core->revision == -1);
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return is_valid_property[core->revision](core, property);
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}
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static bool si476x_core_is_readonly_property(struct si476x_core *core,
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u16 property)
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{
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BUG_ON(core->revision > SI476X_REVISION_A30 ||
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core->revision == -1);
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switch (core->revision) {
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case SI476X_REVISION_A10:
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return (property == 0x3200);
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case SI476X_REVISION_A20:
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return (property == 0x1006 ||
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property == 0x2210 ||
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property == 0x3200);
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case SI476X_REVISION_A30:
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return false;
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}
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return false;
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}
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static bool si476x_core_regmap_readable_register(struct device *dev,
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unsigned int reg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct si476x_core *core = i2c_get_clientdata(client);
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return si476x_core_is_valid_property(core, (u16) reg);
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}
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static bool si476x_core_regmap_writable_register(struct device *dev,
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unsigned int reg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct si476x_core *core = i2c_get_clientdata(client);
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return si476x_core_is_valid_property(core, (u16) reg) &&
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!si476x_core_is_readonly_property(core, (u16) reg);
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}
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static int si476x_core_regmap_write(void *context, unsigned int reg,
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unsigned int val)
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{
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return si476x_core_cmd_set_property(context, reg, val);
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}
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static int si476x_core_regmap_read(void *context, unsigned int reg,
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unsigned *val)
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{
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struct si476x_core *core = context;
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int err;
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err = si476x_core_cmd_get_property(core, reg);
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if (err < 0)
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return err;
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*val = err;
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return 0;
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}
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static const struct regmap_config si476x_regmap_config = {
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.reg_bits = 16,
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.val_bits = 16,
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.max_register = 0x4003,
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.writeable_reg = si476x_core_regmap_writable_register,
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.readable_reg = si476x_core_regmap_readable_register,
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.reg_read = si476x_core_regmap_read,
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.reg_write = si476x_core_regmap_write,
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.cache_type = REGCACHE_RBTREE,
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};
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struct regmap *devm_regmap_init_si476x(struct si476x_core *core)
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{
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return devm_regmap_init(&core->client->dev, NULL,
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core, &si476x_regmap_config);
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init_si476x);
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