xref: /nrf52832-nimble/rt-thread/components/drivers/i2c/fm24clxx.c (revision 104654410c56c573564690304ae786df310c91fc)
1 /*
2  * Copyright (c) 2006-2018, RT-Thread Development Team
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Change Logs:
7  * Date           Author       Notes
8  * 2017-07-14     aubr.cool    1st version
9  */
10 #include <rtthread.h>
11 #include <rtdevice.h>
12 #include "fm24clxx.h"
13 
14 struct fm24clxx_device
15 {
16     struct rt_device         parent;
17     struct rt_i2c_bus_device *bus;
18 };
19 
20 /* RT-Thread device interface */
21 
fm24clxx_init(rt_device_t dev)22 static rt_err_t fm24clxx_init(rt_device_t dev)
23 {
24     return RT_EOK;
25 }
fm24clxx_open(rt_device_t dev,rt_uint16_t oflag)26 static rt_err_t fm24clxx_open(rt_device_t dev, rt_uint16_t oflag)
27 {
28     return RT_EOK;
29 }
30 
fm24clxx_close(rt_device_t dev)31 static rt_err_t fm24clxx_close(rt_device_t dev)
32 {
33     return RT_EOK;
34 }
35 
fm24clxx_control(rt_device_t dev,int cmd,void * args)36 static rt_err_t fm24clxx_control(rt_device_t dev, int cmd, void *args)
37 {
38     return RT_EOK;
39 }
40 
fm24clxx_read(rt_device_t dev,rt_off_t pos,void * buffer,rt_size_t size)41 static rt_size_t fm24clxx_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
42 {
43     struct fm24clxx_device *fm24clxx;
44     const struct fm24clxx_config *cfg;
45     struct rt_i2c_msg msg[2];
46     rt_uint8_t mem_addr[2] = {0,};
47     rt_size_t ret = 0;
48     RT_ASSERT(dev != 0);
49 
50     fm24clxx = (struct fm24clxx_device *) dev;
51 
52     RT_ASSERT(fm24clxx->parent.user_data != 0);
53     cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
54 
55     if(pos > cfg->size)
56     {
57          return 0;
58     }
59 
60     if(pos + size > cfg->size)
61     {
62          size = cfg->size - pos;
63     }
64 
65     msg[0].addr     = cfg->addr;
66     msg[0].flags    = cfg->flags | RT_I2C_WR;
67     mem_addr[0]     = (pos >> 8);
68     mem_addr[1]     = (rt_uint8_t) pos;
69     msg[0].buf      = (rt_uint8_t *) mem_addr;
70     msg[0].len      =  2;
71 
72     msg[1].addr     = cfg->addr;
73     msg[1].flags    = cfg->flags | RT_I2C_RD;
74     msg[1].buf      = (rt_uint8_t *) buffer;
75     msg[1].len      = size;
76 
77     ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
78     return (ret == 2) ? size : 0;
79 }
80 
fm24clxx_write(rt_device_t dev,rt_off_t pos,const void * buffer,rt_size_t size)81 static rt_size_t fm24clxx_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
82 {
83     struct fm24clxx_device *fm24clxx;
84     const struct fm24clxx_config *cfg;
85     struct rt_i2c_msg msg[2];
86     rt_uint8_t mem_addr[2] = {0,};
87     rt_size_t ret = 0;
88     RT_ASSERT(dev != 0);
89 
90     fm24clxx = (struct fm24clxx_device *) dev;
91 
92     RT_ASSERT(fm24clxx->parent.user_data != 0);
93     cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
94 
95     if(pos > cfg->size)
96     {
97          return 0;
98     }
99 
100     if(pos + size > cfg->size)
101     {
102          size = cfg->size - pos;
103     }
104 
105     msg[0].addr     = cfg->addr;
106     msg[0].flags    = cfg->flags | RT_I2C_WR;
107     mem_addr[0]     = (pos >> 8);
108     mem_addr[1]     = (rt_uint8_t) pos;
109     msg[0].buf      = (rt_uint8_t *) mem_addr;
110     msg[0].len      =  2;
111 
112     msg[1].addr     = cfg->addr;
113     msg[1].flags    = cfg->flags | RT_I2C_WR | RT_I2C_NO_START;
114     msg[1].buf      = (rt_uint8_t *) buffer;
115     msg[1].len      = size;
116 
117     ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
118     return (ret == 2) ? size : 0;
119 }
120 
121 #ifdef RT_USING_DEVICE_OPS
122 const static struct rt_device fm24clxx_ops =
123 {
124     fm24clxx_init,
125     fm24clxx_open,
126     fm24clxx_close,
127     fm24clxx_read,
128     fm24clxx_write,
129     fm24clxx_control
130 };
131 #endif
132 
fm24clxx_register(const char * fm_device_name,const char * i2c_bus,void * user_data)133 rt_err_t fm24clxx_register(const char *fm_device_name, const char *i2c_bus, void *user_data)
134 {
135     static struct fm24clxx_device fm24clxx_drv;
136     struct rt_i2c_bus_device *bus;
137 
138     bus = rt_i2c_bus_device_find(i2c_bus);
139     if (bus == RT_NULL)
140     {
141         return RT_ENOSYS;
142     }
143 
144     fm24clxx_drv.bus = bus;
145     fm24clxx_drv.parent.type      = RT_Device_Class_Block;
146 #ifdef RT_USING_DEVICE_OPS
147     fm24clxx_drv.parent.ops       = &fm24clxx_ops;
148 #else
149     fm24clxx_drv.parent.init      = fm24clxx_init;
150     fm24clxx_drv.parent.open      = fm24clxx_open;
151     fm24clxx_drv.parent.close     = fm24clxx_close;
152     fm24clxx_drv.parent.read      = fm24clxx_read;
153     fm24clxx_drv.parent.write     = fm24clxx_write;
154     fm24clxx_drv.parent.control   = fm24clxx_control;
155 #endif
156 
157     fm24clxx_drv.parent.user_data = user_data;
158 
159     return rt_device_register(&fm24clxx_drv.parent, fm_device_name, RT_DEVICE_FLAG_RDWR);
160 }