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
23struct si476x_property_range {
24 u16 low, high;
25};
26
27static 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
40static 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
53static 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
94static 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
115static 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
141typedef bool (*valid_property_pred_t) (struct si476x_core *, u16);
142
143static 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
158static 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
178static 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
188static 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
199static 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
205static 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
221static 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
236struct 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}
241EXPORT_SYMBOL_GPL(devm_regmap_init_si476x);
242