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8e8e69d6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
37955069 AS |
2 | /* |
3 | * drivers/mfd/si476x-prop.c -- Subroutines to access | |
4 | * properties of si476x chips | |
5 | * | |
6 | * Copyright (C) 2012 Innovative Converged Devices(ICD) | |
7 | * Copyright (C) 2013 Andrey Smirnov | |
8 | * | |
9 | * Author: Andrey Smirnov <andrew.smirnov@gmail.com> | |
37955069 AS |
10 | */ |
11 | #include <linux/module.h> | |
12 | ||
13 | #include <linux/mfd/si476x-core.h> | |
14 | ||
15 | struct si476x_property_range { | |
16 | u16 low, high; | |
17 | }; | |
18 | ||
19 | static bool si476x_core_element_is_in_array(u16 element, | |
20 | const u16 array[], | |
21 | size_t size) | |
22 | { | |
23 | int i; | |
24 | ||
25 | for (i = 0; i < size; i++) | |
26 | if (element == array[i]) | |
27 | return true; | |
28 | ||
29 | return false; | |
30 | } | |
31 | ||
32 | static bool si476x_core_element_is_in_range(u16 element, | |
33 | const struct si476x_property_range range[], | |
34 | size_t size) | |
35 | { | |
36 | int i; | |
37 | ||
38 | for (i = 0; i < size; i++) | |
39 | if (element <= range[i].high && element >= range[i].low) | |
40 | return true; | |
41 | ||
42 | return false; | |
43 | } | |
44 | ||
45 | static bool si476x_core_is_valid_property_a10(struct si476x_core *core, | |
46 | u16 property) | |
47 | { | |
48 | static const u16 valid_properties[] = { | |
49 | 0x0000, | |
50 | 0x0500, 0x0501, | |
51 | 0x0600, | |
52 | 0x0709, 0x070C, 0x070D, 0x70E, 0x710, | |
53 | 0x0718, | |
54 | 0x1207, 0x1208, | |
55 | 0x2007, | |
56 | 0x2300, | |
57 | }; | |
58 | ||
59 | static const struct si476x_property_range valid_ranges[] = { | |
60 | { 0x0200, 0x0203 }, | |
61 | { 0x0300, 0x0303 }, | |
62 | { 0x0400, 0x0404 }, | |
63 | { 0x0700, 0x0707 }, | |
64 | { 0x1100, 0x1102 }, | |
65 | { 0x1200, 0x1204 }, | |
66 | { 0x1300, 0x1306 }, | |
67 | { 0x2000, 0x2005 }, | |
68 | { 0x2100, 0x2104 }, | |
69 | { 0x2106, 0x2106 }, | |
70 | { 0x2200, 0x220E }, | |
71 | { 0x3100, 0x3104 }, | |
72 | { 0x3207, 0x320F }, | |
73 | { 0x3300, 0x3304 }, | |
74 | { 0x3500, 0x3517 }, | |
75 | { 0x3600, 0x3617 }, | |
76 | { 0x3700, 0x3717 }, | |
77 | { 0x4000, 0x4003 }, | |
78 | }; | |
79 | ||
80 | return si476x_core_element_is_in_range(property, valid_ranges, | |
81 | ARRAY_SIZE(valid_ranges)) || | |
82 | si476x_core_element_is_in_array(property, valid_properties, | |
83 | ARRAY_SIZE(valid_properties)); | |
84 | } | |
85 | ||
86 | static bool si476x_core_is_valid_property_a20(struct si476x_core *core, | |
87 | u16 property) | |
88 | { | |
89 | static const u16 valid_properties[] = { | |
90 | 0x071B, | |
91 | 0x1006, | |
92 | 0x2210, | |
93 | 0x3401, | |
94 | }; | |
95 | ||
96 | static const struct si476x_property_range valid_ranges[] = { | |
97 | { 0x2215, 0x2219 }, | |
98 | }; | |
99 | ||
100 | return si476x_core_is_valid_property_a10(core, property) || | |
101 | si476x_core_element_is_in_range(property, valid_ranges, | |
102 | ARRAY_SIZE(valid_ranges)) || | |
103 | si476x_core_element_is_in_array(property, valid_properties, | |
104 | ARRAY_SIZE(valid_properties)); | |
105 | } | |
106 | ||
107 | static bool si476x_core_is_valid_property_a30(struct si476x_core *core, | |
108 | u16 property) | |
109 | { | |
110 | static const u16 valid_properties[] = { | |
111 | 0x071C, 0x071D, | |
112 | 0x1007, 0x1008, | |
113 | 0x220F, 0x2214, | |
114 | 0x2301, | |
115 | 0x3105, 0x3106, | |
116 | 0x3402, | |
117 | }; | |
118 | ||
119 | static const struct si476x_property_range valid_ranges[] = { | |
120 | { 0x0405, 0x0411 }, | |
121 | { 0x2008, 0x200B }, | |
122 | { 0x2220, 0x2223 }, | |
123 | { 0x3100, 0x3106 }, | |
124 | }; | |
125 | ||
126 | return si476x_core_is_valid_property_a20(core, property) || | |
127 | si476x_core_element_is_in_range(property, valid_ranges, | |
128 | ARRAY_SIZE(valid_ranges)) || | |
129 | si476x_core_element_is_in_array(property, valid_properties, | |
130 | ARRAY_SIZE(valid_properties)); | |
131 | } | |
132 | ||
133 | typedef bool (*valid_property_pred_t) (struct si476x_core *, u16); | |
134 | ||
135 | static bool si476x_core_is_valid_property(struct si476x_core *core, | |
136 | u16 property) | |
137 | { | |
138 | static const valid_property_pred_t is_valid_property[] = { | |
139 | [SI476X_REVISION_A10] = si476x_core_is_valid_property_a10, | |
140 | [SI476X_REVISION_A20] = si476x_core_is_valid_property_a20, | |
141 | [SI476X_REVISION_A30] = si476x_core_is_valid_property_a30, | |
142 | }; | |
143 | ||
144 | BUG_ON(core->revision > SI476X_REVISION_A30 || | |
145 | core->revision == -1); | |
146 | return is_valid_property[core->revision](core, property); | |
147 | } | |
148 | ||
149 | ||
150 | static bool si476x_core_is_readonly_property(struct si476x_core *core, | |
151 | u16 property) | |
152 | { | |
153 | BUG_ON(core->revision > SI476X_REVISION_A30 || | |
154 | core->revision == -1); | |
155 | ||
156 | switch (core->revision) { | |
157 | case SI476X_REVISION_A10: | |
158 | return (property == 0x3200); | |
159 | case SI476X_REVISION_A20: | |
160 | return (property == 0x1006 || | |
161 | property == 0x2210 || | |
162 | property == 0x3200); | |
163 | case SI476X_REVISION_A30: | |
164 | return false; | |
165 | } | |
166 | ||
167 | return false; | |
168 | } | |
169 | ||
170 | static bool si476x_core_regmap_readable_register(struct device *dev, | |
171 | unsigned int reg) | |
172 | { | |
173 | struct i2c_client *client = to_i2c_client(dev); | |
174 | struct si476x_core *core = i2c_get_clientdata(client); | |
175 | ||
176 | return si476x_core_is_valid_property(core, (u16) reg); | |
177 | ||
178 | } | |
179 | ||
180 | static bool si476x_core_regmap_writable_register(struct device *dev, | |
181 | unsigned int reg) | |
182 | { | |
183 | struct i2c_client *client = to_i2c_client(dev); | |
184 | struct si476x_core *core = i2c_get_clientdata(client); | |
185 | ||
186 | return si476x_core_is_valid_property(core, (u16) reg) && | |
187 | !si476x_core_is_readonly_property(core, (u16) reg); | |
188 | } | |
189 | ||
190 | ||
191 | static int si476x_core_regmap_write(void *context, unsigned int reg, | |
192 | unsigned int val) | |
193 | { | |
194 | return si476x_core_cmd_set_property(context, reg, val); | |
195 | } | |
196 | ||
197 | static int si476x_core_regmap_read(void *context, unsigned int reg, | |
198 | unsigned *val) | |
199 | { | |
200 | struct si476x_core *core = context; | |
201 | int err; | |
202 | ||
203 | err = si476x_core_cmd_get_property(core, reg); | |
204 | if (err < 0) | |
205 | return err; | |
206 | ||
207 | *val = err; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | ||
213 | static const struct regmap_config si476x_regmap_config = { | |
214 | .reg_bits = 16, | |
215 | .val_bits = 16, | |
216 | ||
217 | .max_register = 0x4003, | |
218 | ||
219 | .writeable_reg = si476x_core_regmap_writable_register, | |
220 | .readable_reg = si476x_core_regmap_readable_register, | |
221 | ||
222 | .reg_read = si476x_core_regmap_read, | |
223 | .reg_write = si476x_core_regmap_write, | |
224 | ||
225 | .cache_type = REGCACHE_RBTREE, | |
226 | }; | |
227 | ||
228 | struct regmap *devm_regmap_init_si476x(struct si476x_core *core) | |
229 | { | |
230 | return devm_regmap_init(&core->client->dev, NULL, | |
231 | core, &si476x_regmap_config); | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(devm_regmap_init_si476x); |