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a01779f8 JC |
1 | /* |
2 | * Register map access API - SPMI support | |
3 | * | |
4 | * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. | |
5 | * | |
6 | * Based on regmap-i2c.c: | |
7 | * Copyright 2011 Wolfson Microelectronics plc | |
8 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.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 version 2 and | |
12 | * only version 2 as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | */ | |
20 | #include <linux/regmap.h> | |
21 | #include <linux/spmi.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | ||
c9afbb05 JC |
25 | static int regmap_spmi_base_read(void *context, |
26 | const void *reg, size_t reg_size, | |
27 | void *val, size_t val_size) | |
a01779f8 | 28 | { |
c9afbb05 JC |
29 | u8 addr = *(u8 *)reg; |
30 | int err = 0; | |
31 | ||
32 | BUG_ON(reg_size != 1); | |
33 | ||
34 | while (val_size-- && !err) | |
35 | err = spmi_register_read(context, addr++, val++); | |
36 | ||
37 | return err; | |
38 | } | |
39 | ||
40 | static int regmap_spmi_base_gather_write(void *context, | |
41 | const void *reg, size_t reg_size, | |
42 | const void *val, size_t val_size) | |
43 | { | |
44 | const u8 *data = val; | |
45 | u8 addr = *(u8 *)reg; | |
46 | int err = 0; | |
47 | ||
48 | BUG_ON(reg_size != 1); | |
49 | ||
50 | /* | |
51 | * SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence, | |
52 | * use it when possible. | |
53 | */ | |
54 | if (addr == 0 && val_size) { | |
55 | err = spmi_register_zero_write(context, *data); | |
56 | if (err) | |
57 | goto err_out; | |
58 | ||
59 | data++; | |
60 | addr++; | |
61 | val_size--; | |
62 | } | |
63 | ||
64 | while (val_size) { | |
65 | err = spmi_register_write(context, addr, *data); | |
66 | if (err) | |
67 | goto err_out; | |
68 | ||
69 | data++; | |
70 | addr++; | |
71 | val_size--; | |
72 | } | |
73 | ||
74 | err_out: | |
75 | return err; | |
76 | } | |
77 | ||
78 | static int regmap_spmi_base_write(void *context, const void *data, | |
79 | size_t count) | |
80 | { | |
81 | BUG_ON(count < 1); | |
82 | return regmap_spmi_base_gather_write(context, data, 1, data + 1, | |
83 | count - 1); | |
84 | } | |
85 | ||
9c2e5cb3 | 86 | static const struct regmap_bus regmap_spmi_base = { |
c9afbb05 JC |
87 | .read = regmap_spmi_base_read, |
88 | .write = regmap_spmi_base_write, | |
89 | .gather_write = regmap_spmi_base_gather_write, | |
90 | .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
91 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
92 | }; | |
93 | ||
3cfe7a74 NB |
94 | struct regmap *__regmap_init_spmi_base(struct spmi_device *sdev, |
95 | const struct regmap_config *config, | |
96 | struct lock_class_key *lock_key, | |
97 | const char *lock_name) | |
c9afbb05 | 98 | { |
3cfe7a74 NB |
99 | return __regmap_init(&sdev->dev, ®map_spmi_base, sdev, config, |
100 | lock_key, lock_name); | |
c9afbb05 | 101 | } |
3cfe7a74 | 102 | EXPORT_SYMBOL_GPL(__regmap_init_spmi_base); |
c9afbb05 | 103 | |
3cfe7a74 NB |
104 | struct regmap *__devm_regmap_init_spmi_base(struct spmi_device *sdev, |
105 | const struct regmap_config *config, | |
106 | struct lock_class_key *lock_key, | |
107 | const char *lock_name) | |
c9afbb05 | 108 | { |
3cfe7a74 NB |
109 | return __devm_regmap_init(&sdev->dev, ®map_spmi_base, sdev, config, |
110 | lock_key, lock_name); | |
c9afbb05 | 111 | } |
3cfe7a74 | 112 | EXPORT_SYMBOL_GPL(__devm_regmap_init_spmi_base); |
c9afbb05 JC |
113 | |
114 | static int regmap_spmi_ext_read(void *context, | |
115 | const void *reg, size_t reg_size, | |
116 | void *val, size_t val_size) | |
117 | { | |
118 | int err = 0; | |
119 | size_t len; | |
120 | u16 addr; | |
121 | ||
a01779f8 | 122 | BUG_ON(reg_size != 2); |
c9afbb05 JC |
123 | |
124 | addr = *(u16 *)reg; | |
125 | ||
126 | /* | |
127 | * Split accesses into two to take advantage of the more | |
128 | * bandwidth-efficient 'Extended Register Read' command when possible | |
129 | */ | |
130 | while (addr <= 0xFF && val_size) { | |
131 | len = min_t(size_t, val_size, 16); | |
132 | ||
133 | err = spmi_ext_register_read(context, addr, val, len); | |
134 | if (err) | |
135 | goto err_out; | |
136 | ||
137 | addr += len; | |
138 | val += len; | |
139 | val_size -= len; | |
140 | } | |
141 | ||
142 | while (val_size) { | |
143 | len = min_t(size_t, val_size, 8); | |
144 | ||
dec8e8f6 | 145 | err = spmi_ext_register_readl(context, addr, val, len); |
c9afbb05 JC |
146 | if (err) |
147 | goto err_out; | |
148 | ||
149 | addr += len; | |
150 | val += len; | |
151 | val_size -= len; | |
152 | } | |
153 | ||
154 | err_out: | |
155 | return err; | |
a01779f8 JC |
156 | } |
157 | ||
c9afbb05 JC |
158 | static int regmap_spmi_ext_gather_write(void *context, |
159 | const void *reg, size_t reg_size, | |
160 | const void *val, size_t val_size) | |
a01779f8 | 161 | { |
c9afbb05 JC |
162 | int err = 0; |
163 | size_t len; | |
164 | u16 addr; | |
165 | ||
a01779f8 | 166 | BUG_ON(reg_size != 2); |
c9afbb05 JC |
167 | |
168 | addr = *(u16 *)reg; | |
169 | ||
170 | while (addr <= 0xFF && val_size) { | |
171 | len = min_t(size_t, val_size, 16); | |
172 | ||
173 | err = spmi_ext_register_write(context, addr, val, len); | |
174 | if (err) | |
175 | goto err_out; | |
176 | ||
177 | addr += len; | |
178 | val += len; | |
179 | val_size -= len; | |
180 | } | |
181 | ||
182 | while (val_size) { | |
183 | len = min_t(size_t, val_size, 8); | |
184 | ||
185 | err = spmi_ext_register_writel(context, addr, val, len); | |
186 | if (err) | |
187 | goto err_out; | |
188 | ||
189 | addr += len; | |
190 | val += len; | |
191 | val_size -= len; | |
192 | } | |
193 | ||
194 | err_out: | |
195 | return err; | |
a01779f8 JC |
196 | } |
197 | ||
c9afbb05 JC |
198 | static int regmap_spmi_ext_write(void *context, const void *data, |
199 | size_t count) | |
a01779f8 JC |
200 | { |
201 | BUG_ON(count < 2); | |
c9afbb05 JC |
202 | return regmap_spmi_ext_gather_write(context, data, 2, data + 2, |
203 | count - 2); | |
a01779f8 JC |
204 | } |
205 | ||
9c2e5cb3 | 206 | static const struct regmap_bus regmap_spmi_ext = { |
c9afbb05 JC |
207 | .read = regmap_spmi_ext_read, |
208 | .write = regmap_spmi_ext_write, | |
209 | .gather_write = regmap_spmi_ext_gather_write, | |
a01779f8 JC |
210 | .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, |
211 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
212 | }; | |
213 | ||
3cfe7a74 NB |
214 | struct regmap *__regmap_init_spmi_ext(struct spmi_device *sdev, |
215 | const struct regmap_config *config, | |
216 | struct lock_class_key *lock_key, | |
217 | const char *lock_name) | |
a01779f8 | 218 | { |
3cfe7a74 NB |
219 | return __regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config, |
220 | lock_key, lock_name); | |
a01779f8 | 221 | } |
3cfe7a74 | 222 | EXPORT_SYMBOL_GPL(__regmap_init_spmi_ext); |
a01779f8 | 223 | |
3cfe7a74 NB |
224 | struct regmap *__devm_regmap_init_spmi_ext(struct spmi_device *sdev, |
225 | const struct regmap_config *config, | |
226 | struct lock_class_key *lock_key, | |
227 | const char *lock_name) | |
a01779f8 | 228 | { |
3cfe7a74 NB |
229 | return __devm_regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config, |
230 | lock_key, lock_name); | |
a01779f8 | 231 | } |
3cfe7a74 | 232 | EXPORT_SYMBOL_GPL(__devm_regmap_init_spmi_ext); |
a01779f8 JC |
233 | |
234 | MODULE_LICENSE("GPL"); |