Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | /* i2c-sensor.c - Part of lm_sensors, Linux kernel modules for hardware monitoring Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl> and Mark D. Studebaker <mdsxyz123@yahoo.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* #define DEBUG 1 */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/ctype.h> #include <linux/sysctl.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/i2c.h> #include <linux/i2c-sensor.h> #include <asm/uaccess.h> /* Very inefficient for ISA detects, and won't work for 10-bit addresses! */ int i2c_detect(struct i2c_adapter *adapter, struct i2c_address_data *address_data, int (*found_proc) (struct i2c_adapter *, int, int)) { int addr, i, found, j, err; struct i2c_force_data *this_force; int is_isa = i2c_is_isa_adapter(adapter); int adapter_id = is_isa ? ANY_I2C_ISA_BUS : i2c_adapter_id(adapter); /* Forget it if we can't probe using SMBUS_QUICK */ if ((!is_isa) && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) return -1; for (addr = 0x00; addr <= (is_isa ? 0xffff : 0x7f); addr++) { /* XXX: WTF is going on here??? */ if ((is_isa && check_region(addr, 1)) || (!is_isa && i2c_check_addr(adapter, addr))) continue; /* If it is in one of the force entries, we don't do any detection at all */ found = 0; for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) { for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) { if ( ((adapter_id == this_force->force[j]) || ((this_force->force[j] == ANY_I2C_BUS) && !is_isa)) && (addr == this_force->force[j + 1]) ) { dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr); if ((err = found_proc(adapter, addr, this_force->kind))) return err; found = 1; } } } if (found) continue; /* If this address is in one of the ignores, we can forget about it right now */ for (i = 0; !found && (address_data->ignore[i] != I2C_CLIENT_END); i += 2) { if ( ((adapter_id == address_data->ignore[i]) || ((address_data->ignore[i] == ANY_I2C_BUS) && !is_isa)) && (addr == address_data->ignore[i + 1])) { dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr); found = 1; } } for (i = 0; !found && (address_data->ignore_range[i] != I2C_CLIENT_END); i += 3) { if ( ((adapter_id == address_data->ignore_range[i]) || ((address_data-> ignore_range[i] == ANY_I2C_BUS) & !is_isa)) && (addr >= address_data->ignore_range[i + 1]) && (addr <= address_data->ignore_range[i + 2])) { dev_dbg(&adapter->dev, "found ignore_range parameter for adapter %d, addr %04x\n", adapter_id, addr); found = 1; } } if (found) continue; /* Now, we will do a detection, but only if it is in the normal or probe entries */ if (is_isa) { for (i = 0; !found && (address_data->normal_isa[i] != I2C_CLIENT_ISA_END); i += 1) { if (addr == address_data->normal_isa[i]) { dev_dbg(&adapter->dev, "found normal isa entry for adapter %d, addr %04x\n", adapter_id, addr); found = 1; } } for (i = 0; !found && (address_data->normal_isa_range[i] != I2C_CLIENT_ISA_END); i += 3) { if ((addr >= address_data->normal_isa_range[i]) && (addr <= address_data->normal_isa_range[i + 1]) && ((addr - address_data->normal_isa_range[i]) % address_data->normal_isa_range[i + 2] == 0)) { dev_dbg(&adapter->dev, "found normal isa_range entry for adapter %d, addr %04x", adapter_id, addr); found = 1; } } } else { for (i = 0; !found && (address_data->normal_i2c[i] != I2C_CLIENT_END); i += 1) { if (addr == address_data->normal_i2c[i]) { found = 1; dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x", adapter_id, addr); } } for (i = 0; !found && (address_data->normal_i2c_range[i] != I2C_CLIENT_END); i += 2) { if ((addr >= address_data->normal_i2c_range[i]) && (addr <= address_data->normal_i2c_range[i + 1])) { dev_dbg(&adapter->dev, "found normal i2c_range entry for adapter %d, addr %04x\n", adapter_id, addr); found = 1; } } } for (i = 0; !found && (address_data->probe[i] != I2C_CLIENT_END); i += 2) { if (((adapter_id == address_data->probe[i]) || ((address_data-> probe[i] == ANY_I2C_BUS) & !is_isa)) && (addr == address_data->probe[i + 1])) { dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr); found = 1; } } for (i = 0; !found && (address_data->probe_range[i] != I2C_CLIENT_END); i += 3) { if ( ((adapter_id == address_data->probe_range[i]) || ((address_data->probe_range[i] == ANY_I2C_BUS) & !is_isa)) && (addr >= address_data->probe_range[i + 1]) && (addr <= address_data->probe_range[i + 2])) { found = 1; dev_dbg(&adapter->dev, "found probe_range parameter for adapter %d, addr %04x\n", adapter_id, addr); } } if (!found) continue; /* OK, so we really should examine this address. First check whether there is some client here at all! */ if (is_isa || (i2c_smbus_xfer (adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0)) if ((err = found_proc(adapter, addr, -1))) return err; } return 0; } EXPORT_SYMBOL(i2c_detect); MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); MODULE_DESCRIPTION("i2c-sensor driver"); MODULE_LICENSE("GPL"); |