1/*- 2 * Copyright (c) 1998 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 *
| 1/*- 2 * Copyright (c) 1998 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 *
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26 * $Id: iicbus.c,v 1.5 1998/11/22 22:01:42 nsouch Exp $
| 26 * $Id: iicbus.c,v 1.6 1998/12/07 21:58:16 archie Exp $
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27 * 28 */ 29 30/* 31 * Autoconfiguration and support routines for the Philips serial I2C bus 32 */ 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38#include <sys/bus.h> 39 40#include <machine/clock.h> 41 42#include <dev/iicbus/iiconf.h> 43#include <dev/iicbus/iicbus.h> 44 45#include "iicbus_if.h" 46 47#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev)) 48 49/* 50 * structure used to attach devices to the I2C bus 51 */ 52struct iicbus_device { 53 const char *iicd_name; /* device name */ 54 int iicd_class; /* driver or slave device class */ 55 const char *iicd_desc; /* device descriptor */ 56 u_char iicd_addr; /* address of the device */ 57 int iicd_waitack; /* wait for ack timeout or delay */ 58 int iicd_alive; /* 1 if device found */ 59}; 60 61/* 62 * Common I2C addresses 63 */ 64#define I2C_GENERAL_CALL 0x0 65#define PCF_MASTER_ADDRESS 0xaa 66#define FIRST_SLAVE_ADDR 0x2 67 68#define LAST_SLAVE_ADDR 255 69 70#define IICBUS_UNKNOWN_CLASS 0 71#define IICBUS_DEVICE_CLASS 1 72#define IICBUS_DRIVER_CLASS 2 73 74/* 75 * list of known devices
| 27 * 28 */ 29 30/* 31 * Autoconfiguration and support routines for the Philips serial I2C bus 32 */ 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38#include <sys/bus.h> 39 40#include <machine/clock.h> 41 42#include <dev/iicbus/iiconf.h> 43#include <dev/iicbus/iicbus.h> 44 45#include "iicbus_if.h" 46 47#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev)) 48 49/* 50 * structure used to attach devices to the I2C bus 51 */ 52struct iicbus_device { 53 const char *iicd_name; /* device name */ 54 int iicd_class; /* driver or slave device class */ 55 const char *iicd_desc; /* device descriptor */ 56 u_char iicd_addr; /* address of the device */ 57 int iicd_waitack; /* wait for ack timeout or delay */ 58 int iicd_alive; /* 1 if device found */ 59}; 60 61/* 62 * Common I2C addresses 63 */ 64#define I2C_GENERAL_CALL 0x0 65#define PCF_MASTER_ADDRESS 0xaa 66#define FIRST_SLAVE_ADDR 0x2 67 68#define LAST_SLAVE_ADDR 255 69 70#define IICBUS_UNKNOWN_CLASS 0 71#define IICBUS_DEVICE_CLASS 1 72#define IICBUS_DRIVER_CLASS 2 73 74/* 75 * list of known devices
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| 76 * 77 * XXX only one smb driver should exist for each I2C interface
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76 */ 77struct iicbus_device iicbus_children[] = { 78 { "iicsmb", IICBUS_DRIVER_CLASS, "I2C to SMB bridge" },
| 78 */ 79struct iicbus_device iicbus_children[] = { 80 { "iicsmb", IICBUS_DRIVER_CLASS, "I2C to SMB bridge" },
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79 { "iic", IICBUS_DEVICE_CLASS, "PCF8574 I2C to 8 bits parallel i/o", 64}, 80 { "iic", IICBUS_DEVICE_CLASS, "PCF8584 as slave", PCF_MASTER_ADDRESS }, 81 { "ic", IICBUS_DEVICE_CLASS, "network interface", PCF_MASTER_ADDRESS },
| 81 { "iic", IICBUS_DRIVER_CLASS, "I2C general purpose I/O" },
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82#if 0
| 82#if 0
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83 { "iic", IICBUS_DRIVER_CLASS, "General Call", I2C_GENERAL_CALL },
| 83 { "ic", IICBUS_DEVICE_CLASS, "network interface", PCF_MASTER_ADDRESS },
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84#endif 85 { NULL, 0 } 86}; 87 88static devclass_t iicbus_devclass; 89 90/* 91 * Device methods 92 */ 93static int iicbus_probe(device_t); 94static int iicbus_attach(device_t); 95static void iicbus_print_child(device_t, device_t); 96static int iicbus_read_ivar(device_t , device_t, int, u_long *); 97static int iicbus_write_ivar(device_t , device_t, int, u_long); 98 99static device_method_t iicbus_methods[] = { 100 /* device interface */ 101 DEVMETHOD(device_probe, iicbus_probe), 102 DEVMETHOD(device_attach, iicbus_attach), 103 DEVMETHOD(device_detach, bus_generic_detach), 104 DEVMETHOD(device_shutdown, bus_generic_shutdown), 105 106 /* bus interface */ 107 DEVMETHOD(bus_print_child, iicbus_print_child), 108 DEVMETHOD(bus_read_ivar, iicbus_read_ivar), 109 DEVMETHOD(bus_write_ivar, iicbus_write_ivar), 110 111 { 0, 0 } 112}; 113 114static driver_t iicbus_driver = { 115 "iicbus", 116 iicbus_methods, 117 DRIVER_TYPE_MISC, 118 sizeof(struct iicbus_softc), 119}; 120 121static int 122iicbus_probe(device_t dev) 123{
| 84#endif 85 { NULL, 0 } 86}; 87 88static devclass_t iicbus_devclass; 89 90/* 91 * Device methods 92 */ 93static int iicbus_probe(device_t); 94static int iicbus_attach(device_t); 95static void iicbus_print_child(device_t, device_t); 96static int iicbus_read_ivar(device_t , device_t, int, u_long *); 97static int iicbus_write_ivar(device_t , device_t, int, u_long); 98 99static device_method_t iicbus_methods[] = { 100 /* device interface */ 101 DEVMETHOD(device_probe, iicbus_probe), 102 DEVMETHOD(device_attach, iicbus_attach), 103 DEVMETHOD(device_detach, bus_generic_detach), 104 DEVMETHOD(device_shutdown, bus_generic_shutdown), 105 106 /* bus interface */ 107 DEVMETHOD(bus_print_child, iicbus_print_child), 108 DEVMETHOD(bus_read_ivar, iicbus_read_ivar), 109 DEVMETHOD(bus_write_ivar, iicbus_write_ivar), 110 111 { 0, 0 } 112}; 113 114static driver_t iicbus_driver = { 115 "iicbus", 116 iicbus_methods, 117 DRIVER_TYPE_MISC, 118 sizeof(struct iicbus_softc), 119}; 120 121static int 122iicbus_probe(device_t dev) 123{
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124 /* always present if probed */
| 124 device_set_desc(dev, "Philips I2C bus"); 125
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125 return (0); 126} 127
| 126 return (0); 127} 128
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| 129#if 0
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128static int 129iic_probe_device(device_t dev, u_char addr) 130{ 131 int count; 132 char byte; 133 134 if ((addr & 1) == 0) { 135 /* is device writable? */ 136 if (!iicbus_start(dev, (u_char)addr, 0)) { 137 iicbus_stop(dev); 138 return (1); 139 } 140 } else { 141 /* is device readable? */ 142 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count)) 143 return (1); 144 } 145 146 return (0); 147}
| 130static int 131iic_probe_device(device_t dev, u_char addr) 132{ 133 int count; 134 char byte; 135 136 if ((addr & 1) == 0) { 137 /* is device writable? */ 138 if (!iicbus_start(dev, (u_char)addr, 0)) { 139 iicbus_stop(dev); 140 return (1); 141 } 142 } else { 143 /* is device readable? */ 144 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count)) 145 return (1); 146 } 147 148 return (0); 149}
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| 150#endif
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148 149/* 150 * We add all the devices which we know about. 151 * The generic attach routine will attach them if they are alive. 152 */ 153static int 154iicbus_attach(device_t dev) 155{ 156 struct iicbus_device *iicdev; 157 device_t child;
| 151 152/* 153 * We add all the devices which we know about. 154 * The generic attach routine will attach them if they are alive. 155 */ 156static int 157iicbus_attach(device_t dev) 158{ 159 struct iicbus_device *iicdev; 160 device_t child;
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158 int addr;
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159 160 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 161
| 161 162 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 163
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| 164 /* device probing is meaningless since the bus is supposed to be 165 * hot-plug. Moreover, some I2C chips do not appreciate random 166 * accesses like stop after start to fast, reads for less than 167 * x bytes... 168 */ 169#if 0
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162 printf("Probing for devices on iicbus%d:", device_get_unit(dev)); 163 164 /* probe any devices */ 165 for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) { 166 if (iic_probe_device(dev, (u_char)addr)) { 167 printf(" <%x>", addr); 168 } 169 } 170 printf("\n");
| 170 printf("Probing for devices on iicbus%d:", device_get_unit(dev)); 171 172 /* probe any devices */ 173 for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) { 174 if (iic_probe_device(dev, (u_char)addr)) { 175 printf(" <%x>", addr); 176 } 177 } 178 printf("\n");
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| 179#endif
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171 172 /* attach known devices */ 173 for (iicdev = iicbus_children; iicdev->iicd_name; iicdev++) { 174 switch (iicdev->iicd_class) { 175 case IICBUS_DEVICE_CLASS: 176 /* check if the devclass exists */
| 180 181 /* attach known devices */ 182 for (iicdev = iicbus_children; iicdev->iicd_name; iicdev++) { 183 switch (iicdev->iicd_class) { 184 case IICBUS_DEVICE_CLASS: 185 /* check if the devclass exists */
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177 if (devclass_find(iicdev->iicd_name) && 178 iic_probe_device(dev, iicdev->iicd_addr))
| 186 if (devclass_find(iicdev->iicd_name))
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179 iicdev->iicd_alive = 1;
| 187 iicdev->iicd_alive = 1;
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| 188 else if (bootverbose) 189 printf("iicbus: %s devclass not found\n", 190 iicdev->iicd_name);
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180 break; 181 182 case IICBUS_DRIVER_CLASS: 183 /* check if the devclass exists */
| 191 break; 192 193 case IICBUS_DRIVER_CLASS: 194 /* check if the devclass exists */
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184 if (!devclass_find(iicdev->iicd_name))
| 195 if (devclass_find(iicdev->iicd_name))
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185 iicdev->iicd_alive = 1;
| 196 iicdev->iicd_alive = 1;
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| 197 else if (bootverbose) 198 printf("iicbus: %s devclass not found\n", 199 iicdev->iicd_name);
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186 break; 187 188 default: 189 panic("%s: unknown class!", __FUNCTION__); 190 } 191 192 if (iicdev->iicd_alive) { 193 child = device_add_child(dev, iicdev->iicd_name, 194 -1, iicdev); 195 device_set_desc(child, iicdev->iicd_desc); 196 } 197 } 198 bus_generic_attach(dev); 199 200 return (0); 201} 202 203int 204iicbus_generic_intr(device_t dev, int event, char *buf) 205{ 206 return (0); 207} 208 209int 210iicbus_null_callback(device_t dev, int index, caddr_t data) 211{ 212 return (0); 213} 214 215int 216iicbus_null_repeated_start(device_t dev, u_char addr) 217{ 218 return (IIC_ENOTSUPP); 219} 220 221static void 222iicbus_print_child(device_t bus, device_t dev) 223{ 224 struct iicbus_device* iicdev = DEVTOIICBUS(dev); 225 226 switch (iicdev->iicd_class) { 227 case IICBUS_DEVICE_CLASS: 228 printf(" on %s%d addr 0x%x", device_get_name(bus), 229 device_get_unit(bus), iicdev->iicd_addr); 230 break; 231 232 case IICBUS_DRIVER_CLASS: 233 printf(" on %s%d", device_get_name(bus), 234 device_get_unit(bus)); 235 break; 236 237 default: 238 panic("%s: unknown class!", __FUNCTION__); 239 } 240 241 return; 242} 243 244static int 245iicbus_read_ivar(device_t bus, device_t dev, int index, u_long* result) 246{ 247 struct iicbus_device* iicdev = DEVTOIICBUS(dev); 248 249 switch (index) { 250 case IICBUS_IVAR_ADDR: 251 *result = (u_long)iicdev->iicd_addr; 252 break; 253 254 default: 255 return (ENOENT); 256 } 257 258 return (0); 259} 260 261static int 262iicbus_write_ivar(device_t bus, device_t dev, int index, u_long val) 263{ 264 switch (index) { 265 default: 266 return (ENOENT); 267 } 268 269 return (0); 270} 271 272DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0); 273DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0); 274DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0);
| 200 break; 201 202 default: 203 panic("%s: unknown class!", __FUNCTION__); 204 } 205 206 if (iicdev->iicd_alive) { 207 child = device_add_child(dev, iicdev->iicd_name, 208 -1, iicdev); 209 device_set_desc(child, iicdev->iicd_desc); 210 } 211 } 212 bus_generic_attach(dev); 213 214 return (0); 215} 216 217int 218iicbus_generic_intr(device_t dev, int event, char *buf) 219{ 220 return (0); 221} 222 223int 224iicbus_null_callback(device_t dev, int index, caddr_t data) 225{ 226 return (0); 227} 228 229int 230iicbus_null_repeated_start(device_t dev, u_char addr) 231{ 232 return (IIC_ENOTSUPP); 233} 234 235static void 236iicbus_print_child(device_t bus, device_t dev) 237{ 238 struct iicbus_device* iicdev = DEVTOIICBUS(dev); 239 240 switch (iicdev->iicd_class) { 241 case IICBUS_DEVICE_CLASS: 242 printf(" on %s%d addr 0x%x", device_get_name(bus), 243 device_get_unit(bus), iicdev->iicd_addr); 244 break; 245 246 case IICBUS_DRIVER_CLASS: 247 printf(" on %s%d", device_get_name(bus), 248 device_get_unit(bus)); 249 break; 250 251 default: 252 panic("%s: unknown class!", __FUNCTION__); 253 } 254 255 return; 256} 257 258static int 259iicbus_read_ivar(device_t bus, device_t dev, int index, u_long* result) 260{ 261 struct iicbus_device* iicdev = DEVTOIICBUS(dev); 262 263 switch (index) { 264 case IICBUS_IVAR_ADDR: 265 *result = (u_long)iicdev->iicd_addr; 266 break; 267 268 default: 269 return (ENOENT); 270 } 271 272 return (0); 273} 274 275static int 276iicbus_write_ivar(device_t bus, device_t dev, int index, u_long val) 277{ 278 switch (index) { 279 default: 280 return (ENOENT); 281 } 282 283 return (0); 284} 285 286DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0); 287DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0); 288DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0);
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275DRIVER_MODULE(iicbus, smbtx, iicbus_driver, iicbus_devclass, 0, 0);
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