Merge tag 'for-airlie-tda998x' of git://git.armlinux.org.uk/~rmk/linux-arm into drm...
[linux-2.6-microblaze.git] / drivers / base / regmap / regmap-spi.c
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Register map access API - SPI support
4 //
5 // Copyright 2011 Wolfson Microelectronics plc
6 //
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9 #include <linux/regmap.h>
10 #include <linux/spi/spi.h>
11 #include <linux/module.h>
12
13 #include "internal.h"
14
15 struct regmap_async_spi {
16         struct regmap_async core;
17         struct spi_message m;
18         struct spi_transfer t[2];
19 };
20
21 static void regmap_spi_complete(void *data)
22 {
23         struct regmap_async_spi *async = data;
24
25         regmap_async_complete_cb(&async->core, async->m.status);
26 }
27
28 static int regmap_spi_write(void *context, const void *data, size_t count)
29 {
30         struct device *dev = context;
31         struct spi_device *spi = to_spi_device(dev);
32
33         return spi_write(spi, data, count);
34 }
35
36 static int regmap_spi_gather_write(void *context,
37                                    const void *reg, size_t reg_len,
38                                    const void *val, size_t val_len)
39 {
40         struct device *dev = context;
41         struct spi_device *spi = to_spi_device(dev);
42         struct spi_message m;
43         struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
44                                      { .tx_buf = val, .len = val_len, }, };
45
46         spi_message_init(&m);
47         spi_message_add_tail(&t[0], &m);
48         spi_message_add_tail(&t[1], &m);
49
50         return spi_sync(spi, &m);
51 }
52
53 static int regmap_spi_async_write(void *context,
54                                   const void *reg, size_t reg_len,
55                                   const void *val, size_t val_len,
56                                   struct regmap_async *a)
57 {
58         struct regmap_async_spi *async = container_of(a,
59                                                       struct regmap_async_spi,
60                                                       core);
61         struct device *dev = context;
62         struct spi_device *spi = to_spi_device(dev);
63
64         async->t[0].tx_buf = reg;
65         async->t[0].len = reg_len;
66         async->t[1].tx_buf = val;
67         async->t[1].len = val_len;
68
69         spi_message_init(&async->m);
70         spi_message_add_tail(&async->t[0], &async->m);
71         if (val)
72                 spi_message_add_tail(&async->t[1], &async->m);
73
74         async->m.complete = regmap_spi_complete;
75         async->m.context = async;
76
77         return spi_async(spi, &async->m);
78 }
79
80 static struct regmap_async *regmap_spi_async_alloc(void)
81 {
82         struct regmap_async_spi *async_spi;
83
84         async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
85         if (!async_spi)
86                 return NULL;
87
88         return &async_spi->core;
89 }
90
91 static int regmap_spi_read(void *context,
92                            const void *reg, size_t reg_size,
93                            void *val, size_t val_size)
94 {
95         struct device *dev = context;
96         struct spi_device *spi = to_spi_device(dev);
97
98         return spi_write_then_read(spi, reg, reg_size, val, val_size);
99 }
100
101 static const struct regmap_bus regmap_spi = {
102         .write = regmap_spi_write,
103         .gather_write = regmap_spi_gather_write,
104         .async_write = regmap_spi_async_write,
105         .async_alloc = regmap_spi_async_alloc,
106         .read = regmap_spi_read,
107         .read_flag_mask = 0x80,
108         .reg_format_endian_default = REGMAP_ENDIAN_BIG,
109         .val_format_endian_default = REGMAP_ENDIAN_BIG,
110 };
111
112 struct regmap *__regmap_init_spi(struct spi_device *spi,
113                                  const struct regmap_config *config,
114                                  struct lock_class_key *lock_key,
115                                  const char *lock_name)
116 {
117         return __regmap_init(&spi->dev, &regmap_spi, &spi->dev, config,
118                              lock_key, lock_name);
119 }
120 EXPORT_SYMBOL_GPL(__regmap_init_spi);
121
122 struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
123                                       const struct regmap_config *config,
124                                       struct lock_class_key *lock_key,
125                                       const char *lock_name)
126 {
127         return __devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config,
128                                   lock_key, lock_name);
129 }
130 EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);
131
132 MODULE_LICENSE("GPL");