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// 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);
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