linux_i2c.c revision 1.2.6.2
1 1.2.6.2 yamt /* $NetBSD: linux_i2c.c,v 1.2.6.2 2014/05/22 11:40:56 yamt Exp $ */ 2 1.2.6.2 yamt 3 1.2.6.2 yamt /*- 4 1.2.6.2 yamt * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2.6.2 yamt * All rights reserved. 6 1.2.6.2 yamt * 7 1.2.6.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.6.2 yamt * by Taylor R. Campbell. 9 1.2.6.2 yamt * 10 1.2.6.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.6.2 yamt * modification, are permitted provided that the following conditions 12 1.2.6.2 yamt * are met: 13 1.2.6.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.6.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.6.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.6.2 yamt * 19 1.2.6.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.6.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.6.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.6.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.6.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.6.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.6.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.6.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.6.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.6.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.6.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.2.6.2 yamt */ 31 1.2.6.2 yamt 32 1.2.6.2 yamt #include <sys/cdefs.h> 33 1.2.6.2 yamt __KERNEL_RCSID(0, "$NetBSD: linux_i2c.c,v 1.2.6.2 2014/05/22 11:40:56 yamt Exp $"); 34 1.2.6.2 yamt 35 1.2.6.2 yamt #include <sys/types.h> 36 1.2.6.2 yamt #include <sys/errno.h> 37 1.2.6.2 yamt #include <sys/queue.h> /* XXX include order botch: i2cvar.h needs */ 38 1.2.6.2 yamt 39 1.2.6.2 yamt #include <dev/i2c/i2cvar.h> 40 1.2.6.2 yamt #include <dev/i2c/i2c_bitbang.h> /* XXX include order botch */ 41 1.2.6.2 yamt 42 1.2.6.2 yamt #include <linux/i2c.h> 43 1.2.6.2 yamt #include <linux/i2c-algo-bit.h> 44 1.2.6.2 yamt 45 1.2.6.2 yamt static int netbsd_i2c_transfer(i2c_tag_t, struct i2c_msg *, int); 46 1.2.6.2 yamt static i2c_op_t linux_i2c_flags_op(uint16_t, bool); 47 1.2.6.2 yamt static int linux_i2c_flags_flags(uint16_t); 48 1.2.6.2 yamt static uint32_t linux_i2cbb_functionality(struct i2c_adapter *); 49 1.2.6.2 yamt static int linux_i2cbb_xfer(struct i2c_adapter *, struct i2c_msg *, int); 50 1.2.6.2 yamt static void linux_i2cbb_set_bits(void *, uint32_t); 51 1.2.6.2 yamt static uint32_t linux_i2cbb_read_bits(void *); 52 1.2.6.2 yamt static void linux_i2cbb_set_dir(void *, uint32_t); 53 1.2.6.2 yamt static int linux_i2cbb_send_start(void *, int); 54 1.2.6.2 yamt static int linux_i2cbb_send_stop(void *, int); 55 1.2.6.2 yamt static int linux_i2cbb_initiate_xfer(void *, i2c_addr_t, int); 56 1.2.6.2 yamt static int linux_i2cbb_read_byte(void *, uint8_t *, int); 57 1.2.6.2 yamt static int linux_i2cbb_write_byte(void *, uint8_t, int); 58 1.2.6.2 yamt 59 1.2.6.2 yamt int 61 1.2.6.2 yamt i2c_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int n) 62 1.2.6.2 yamt { 63 1.2.6.2 yamt 64 1.2.6.2 yamt return (*adapter->algo->master_xfer)(adapter, msgs, n); 65 1.2.6.2 yamt } 66 1.2.6.2 yamt 67 1.2.6.2 yamt static int 68 1.2.6.2 yamt netbsd_i2c_transfer(i2c_tag_t i2c, struct i2c_msg *msgs, int n) 69 1.2.6.2 yamt { 70 1.2.6.2 yamt int i; 71 1.2.6.2 yamt int error; 72 1.2.6.2 yamt 73 1.2.6.2 yamt for (i = 0; i < n; i++) { 74 1.2.6.2 yamt const i2c_op_t op = linux_i2c_flags_op(msgs[i].flags, 75 1.2.6.2 yamt ((i + 1) == n)); 76 1.2.6.2 yamt const int flags = linux_i2c_flags_flags(msgs[i].flags); 77 1.2.6.2 yamt 78 1.2.6.2 yamt switch (op) { 79 1.2.6.2 yamt case I2C_OP_READ: 80 1.2.6.2 yamt case I2C_OP_READ_WITH_STOP: 81 1.2.6.2 yamt error = iic_exec(i2c, op, msgs[i].addr, 82 1.2.6.2 yamt NULL, 0, msgs[i].buf, msgs[i].len, flags); 83 1.2.6.2 yamt break; 84 1.2.6.2 yamt 85 1.2.6.2 yamt case I2C_OP_WRITE: 86 1.2.6.2 yamt case I2C_OP_WRITE_WITH_STOP: 87 1.2.6.2 yamt error = iic_exec(i2c, op, msgs[i].addr, 88 1.2.6.2 yamt msgs[i].buf, msgs[i].len, NULL, 0, flags); 89 1.2.6.2 yamt break; 90 1.2.6.2 yamt 91 1.2.6.2 yamt default: 92 1.2.6.2 yamt error = EINVAL; 93 1.2.6.2 yamt } 94 1.2.6.2 yamt 95 1.2.6.2 yamt if (error) 96 1.2.6.2 yamt /* XXX errno NetBSD->Linux */ 97 1.2.6.2 yamt return -error; 98 1.2.6.2 yamt } 99 1.2.6.2 yamt 100 1.2.6.2 yamt return n; 101 1.2.6.2 yamt } 102 1.2.6.2 yamt 103 1.2.6.2 yamt static i2c_op_t 104 1.2.6.2 yamt linux_i2c_flags_op(uint16_t flags, bool stop) 105 1.2.6.2 yamt { 106 1.2.6.2 yamt 107 1.2.6.2 yamt if (ISSET(flags, I2C_M_RD)) 108 1.2.6.2 yamt return (stop? I2C_OP_READ_WITH_STOP : I2C_OP_READ); 109 1.2.6.2 yamt else 110 1.2.6.2 yamt return (stop? I2C_OP_WRITE_WITH_STOP : I2C_OP_WRITE); 111 1.2.6.2 yamt } 112 1.2.6.2 yamt 113 1.2.6.2 yamt static int 114 1.2.6.2 yamt linux_i2c_flags_flags(uint16_t flags __unused) 115 1.2.6.2 yamt { 116 1.2.6.2 yamt 117 1.2.6.2 yamt return 0; 118 1.2.6.2 yamt } 119 1.2.6.2 yamt 120 1.2.6.2 yamt const struct i2c_algorithm i2c_bit_algo = { 122 1.2.6.2 yamt .master_xfer = linux_i2cbb_xfer, 123 1.2.6.2 yamt .functionality = linux_i2cbb_functionality, 124 1.2.6.2 yamt }; 125 1.2.6.2 yamt 126 1.2.6.2 yamt static uint32_t 127 1.2.6.2 yamt linux_i2cbb_functionality(struct i2c_adapter *adapter __unused) 128 1.2.6.2 yamt { 129 1.2.6.2 yamt uint32_t functions = 0; 130 1.2.6.2 yamt 131 1.2.6.2 yamt functions |= I2C_FUNC_I2C; 132 1.2.6.2 yamt functions |= I2C_FUNC_NOSTART; 133 1.2.6.2 yamt functions |= I2C_FUNC_SMBUS_EMUL; 134 1.2.6.2 yamt functions |= I2C_FUNC_SMBUS_READ_BLOCK_DATA; 135 1.2.6.2 yamt functions |= I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 136 1.2.6.2 yamt #if 0 137 1.2.6.2 yamt functions |= I2C_FUNC_10BIT_ADDR; 138 1.2.6.2 yamt functions |= I2C_FUNC_PROTOCOL_MANGLING; 139 1.2.6.2 yamt #endif 140 1.2.6.2 yamt 141 1.2.6.2 yamt return functions; 142 1.2.6.2 yamt } 143 1.2.6.2 yamt 144 1.2.6.2 yamt static int 145 1.2.6.2 yamt linux_i2cbb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int n) 146 1.2.6.2 yamt { 147 1.2.6.2 yamt struct i2c_algo_bit_data *const abd = adapter->algo_data; 148 1.2.6.2 yamt struct i2c_controller controller = { 149 1.2.6.2 yamt .ic_cookie = abd, 150 1.2.6.2 yamt .ic_send_start = linux_i2cbb_send_start, 151 1.2.6.2 yamt .ic_send_stop = linux_i2cbb_send_stop, 152 1.2.6.2 yamt .ic_initiate_xfer = linux_i2cbb_initiate_xfer, 153 1.2.6.2 yamt .ic_read_byte = linux_i2cbb_read_byte, 154 1.2.6.2 yamt .ic_write_byte = linux_i2cbb_write_byte, 155 1.2.6.2 yamt }; 156 1.2.6.2 yamt i2c_tag_t i2c = &controller; 157 1.2.6.2 yamt int error; 158 1.2.6.2 yamt 159 1.2.6.2 yamt if (abd->pre_xfer) { 160 1.2.6.2 yamt error = (*abd->pre_xfer)(adapter); 161 1.2.6.2 yamt if (error) 162 1.2.6.2 yamt return error; 163 1.2.6.2 yamt } 164 1.2.6.2 yamt 165 1.2.6.2 yamt error = netbsd_i2c_transfer(i2c, msgs, n); 166 1.2.6.2 yamt 167 1.2.6.2 yamt if (abd->post_xfer) 168 1.2.6.2 yamt (*abd->post_xfer)(adapter); 169 1.2.6.2 yamt 170 1.2.6.2 yamt return error; 171 1.2.6.2 yamt } 172 1.2.6.2 yamt 173 1.2.6.2 yamt #define LI2CBB_SDA 0x01 175 1.2.6.2 yamt #define LI2CBB_SCL 0x02 176 1.2.6.2 yamt #define LI2CBB_INPUT 0x04 177 1.2.6.2 yamt #define LI2CBB_OUTPUT 0x08 178 1.2.6.2 yamt 179 1.2.6.2 yamt static struct i2c_bitbang_ops linux_i2cbb_ops = { 180 1.2.6.2 yamt .ibo_set_bits = linux_i2cbb_set_bits, 181 1.2.6.2 yamt .ibo_set_dir = linux_i2cbb_set_dir, 182 1.2.6.2 yamt .ibo_read_bits = linux_i2cbb_read_bits, 183 1.2.6.2 yamt .ibo_bits = { 184 1.2.6.2 yamt [I2C_BIT_SDA] = LI2CBB_SDA, 185 1.2.6.2 yamt [I2C_BIT_SCL] = LI2CBB_SCL, 186 1.2.6.2 yamt [I2C_BIT_INPUT] = LI2CBB_INPUT, 187 1.2.6.2 yamt [I2C_BIT_OUTPUT] = LI2CBB_OUTPUT, 188 1.2.6.2 yamt }, 189 1.2.6.2 yamt }; 190 1.2.6.2 yamt 191 1.2.6.2 yamt static void 192 1.2.6.2 yamt linux_i2cbb_set_bits(void *cookie, uint32_t bits) 193 1.2.6.2 yamt { 194 1.2.6.2 yamt struct i2c_algo_bit_data *const abd = cookie; 195 1.2.6.2 yamt 196 1.2.6.2 yamt (*abd->setsda)(abd->data, (ISSET(bits, LI2CBB_SDA)? 1 : 0)); 197 1.2.6.2 yamt (*abd->setscl)(abd->data, (ISSET(bits, LI2CBB_SCL)? 1 : 0)); 198 1.2.6.2 yamt } 199 1.2.6.2 yamt 200 1.2.6.2 yamt static uint32_t 201 1.2.6.2 yamt linux_i2cbb_read_bits(void *cookie) 202 1.2.6.2 yamt { 203 1.2.6.2 yamt struct i2c_algo_bit_data *const abd = cookie; 204 1.2.6.2 yamt uint32_t bits = 0; 205 1.2.6.2 yamt 206 1.2.6.2 yamt if ((*abd->getsda)(abd->data)) 207 1.2.6.2 yamt bits |= LI2CBB_SDA; 208 1.2.6.2 yamt if ((*abd->getscl)(abd->data)) 209 1.2.6.2 yamt bits |= LI2CBB_SCL; 210 1.2.6.2 yamt 211 1.2.6.2 yamt return bits; 212 1.2.6.2 yamt } 213 1.2.6.2 yamt 214 1.2.6.2 yamt static void 215 1.2.6.2 yamt linux_i2cbb_set_dir(void *cookie __unused, uint32_t bits __unused) 216 1.2.6.2 yamt { 217 1.2.6.2 yamt /* Linux doesn't do anything here... */ 218 1.2.6.2 yamt } 219 1.2.6.2 yamt 220 1.2.6.2 yamt static int 222 1.2.6.2 yamt linux_i2cbb_send_start(void *cookie, int flags) 223 1.2.6.2 yamt { 224 1.2.6.2 yamt 225 1.2.6.2 yamt return i2c_bitbang_send_start(cookie, flags, &linux_i2cbb_ops); 226 1.2.6.2 yamt } 227 1.2.6.2 yamt 228 1.2.6.2 yamt static int 229 1.2.6.2 yamt linux_i2cbb_send_stop(void *cookie, int flags) 230 1.2.6.2 yamt { 231 1.2.6.2 yamt 232 1.2.6.2 yamt return i2c_bitbang_send_stop(cookie, flags, &linux_i2cbb_ops); 233 1.2.6.2 yamt } 234 1.2.6.2 yamt 235 1.2.6.2 yamt static int 236 1.2.6.2 yamt linux_i2cbb_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 237 1.2.6.2 yamt { 238 1.2.6.2 yamt 239 1.2.6.2 yamt return i2c_bitbang_initiate_xfer(cookie, addr, flags, 240 1.2.6.2 yamt &linux_i2cbb_ops); 241 1.2.6.2 yamt } 242 1.2.6.2 yamt 243 1.2.6.2 yamt static int 244 1.2.6.2 yamt linux_i2cbb_read_byte(void *cookie, uint8_t *bytep, int flags) 245 1.2.6.2 yamt { 246 1.2.6.2 yamt 247 1.2.6.2 yamt return i2c_bitbang_read_byte(cookie, bytep, flags, &linux_i2cbb_ops); 248 1.2.6.2 yamt } 249 1.2.6.2 yamt 250 1.2.6.2 yamt static int 251 1.2.6.2 yamt linux_i2cbb_write_byte(void *cookie, uint8_t byte, int flags) 252 { 253 254 return i2c_bitbang_write_byte(cookie, byte, flags, &linux_i2cbb_ops); 255 } 256
Indexes created Tue Sep 30 20:09:53 GMT 2025