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37955069 AS |
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); |