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11#include <linux/module.h>
12
13#include <linux/mfd/si476x-core.h>
14
15struct si476x_property_range {
16 u16 low, high;
17};
18
19static 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
32static 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
45static 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
86static 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
107static 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
133typedef bool (*valid_property_pred_t) (struct si476x_core *, u16);
134
135static 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
150static 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
170static 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
180static 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
191static 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
197static 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
213static 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
228struct 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}
233EXPORT_SYMBOL_GPL(devm_regmap_init_si476x);
234
