1 | // SPDX-License-Identifier: GPL-2.0-only |
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> |
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(element: property, range: valid_ranges, |
81 | ARRAY_SIZE(valid_ranges)) || |
82 | si476x_core_element_is_in_array(element: property, array: 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(element: property, range: valid_ranges, |
102 | ARRAY_SIZE(valid_ranges)) || |
103 | si476x_core_element_is_in_array(element: property, array: 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(element: property, range: valid_ranges, |
128 | ARRAY_SIZE(valid_ranges)) || |
129 | si476x_core_element_is_in_array(element: property, array: 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, property: (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, property: (u16) reg) && |
187 | !si476x_core_is_readonly_property(core, property: (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); |
234 | |