Rev 420 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 420 | giacomo | 1 | /* |
| 2 | i2c-sensor.c - Part of lm_sensors, Linux kernel modules for hardware |
||
| 3 | monitoring |
||
| 4 | Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl> and |
||
| 5 | Mark D. Studebaker <mdsxyz123@yahoo.com> |
||
| 6 | |||
| 7 | This program is free software; you can redistribute it and/or modify |
||
| 8 | it under the terms of the GNU General Public License as published by |
||
| 9 | the Free Software Foundation; either version 2 of the License, or |
||
| 10 | (at your option) any later version. |
||
| 11 | |||
| 12 | This program is distributed in the hope that it will be useful, |
||
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||
| 15 | GNU General Public License for more details. |
||
| 16 | |||
| 17 | You should have received a copy of the GNU General Public License |
||
| 18 | along with this program; if not, write to the Free Software |
||
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
||
| 20 | */ |
||
| 21 | |||
| 22 | /* #define DEBUG 1 */ |
||
| 23 | |||
| 24 | #include <linux/module.h> |
||
| 25 | #include <linux/kernel.h> |
||
| 26 | #include <linux/slab.h> |
||
| 27 | #include <linux/ctype.h> |
||
| 28 | #include <linux/sysctl.h> |
||
| 29 | #include <linux/init.h> |
||
| 30 | #include <linux/ioport.h> |
||
| 31 | #include <linux/i2c.h> |
||
| 32 | #include <linux/i2c-sensor.h> |
||
| 33 | #include <asm/uaccess.h> |
||
| 34 | |||
| 35 | |||
| 36 | /* Very inefficient for ISA detects, and won't work for 10-bit addresses! */ |
||
| 37 | int i2c_detect(struct i2c_adapter *adapter, |
||
| 38 | struct i2c_address_data *address_data, |
||
| 39 | int (*found_proc) (struct i2c_adapter *, int, int)) |
||
| 40 | { |
||
| 41 | int addr, i, found, j, err; |
||
| 42 | struct i2c_force_data *this_force; |
||
| 43 | int is_isa = i2c_is_isa_adapter(adapter); |
||
| 44 | int adapter_id = |
||
| 45 | is_isa ? ANY_I2C_ISA_BUS : i2c_adapter_id(adapter); |
||
| 46 | |||
| 47 | /* Forget it if we can't probe using SMBUS_QUICK */ |
||
| 48 | if ((!is_isa) && |
||
| 49 | !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) |
||
| 50 | return -1; |
||
| 51 | |||
| 52 | for (addr = 0x00; addr <= (is_isa ? 0xffff : 0x7f); addr++) { |
||
| 53 | if (!is_isa && i2c_check_addr(adapter, addr)) |
||
| 54 | continue; |
||
| 55 | |||
| 56 | /* If it is in one of the force entries, we don't do any |
||
| 57 | detection at all */ |
||
| 58 | found = 0; |
||
| 59 | for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) { |
||
| 60 | for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) { |
||
| 61 | if ( ((adapter_id == this_force->force[j]) || |
||
| 62 | ((this_force->force[j] == ANY_I2C_BUS) && !is_isa)) && |
||
| 63 | (addr == this_force->force[j + 1]) ) { |
||
| 64 | dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 65 | if ((err = found_proc(adapter, addr, this_force->kind))) |
||
| 66 | return err; |
||
| 67 | found = 1; |
||
| 68 | } |
||
| 69 | } |
||
| 70 | } |
||
| 71 | if (found) |
||
| 72 | continue; |
||
| 73 | |||
| 74 | /* If this address is in one of the ignores, we can forget about it |
||
| 75 | right now */ |
||
| 76 | for (i = 0; !found && (address_data->ignore[i] != I2C_CLIENT_END); i += 2) { |
||
| 77 | if ( ((adapter_id == address_data->ignore[i]) || |
||
| 78 | ((address_data->ignore[i] == ANY_I2C_BUS) && |
||
| 79 | !is_isa)) && |
||
| 80 | (addr == address_data->ignore[i + 1])) { |
||
| 81 | dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 82 | found = 1; |
||
| 83 | } |
||
| 84 | } |
||
| 85 | for (i = 0; !found && (address_data->ignore_range[i] != I2C_CLIENT_END); i += 3) { |
||
| 86 | if ( ((adapter_id == address_data->ignore_range[i]) || |
||
| 87 | ((address_data-> ignore_range[i] == ANY_I2C_BUS) & |
||
| 88 | !is_isa)) && |
||
| 89 | (addr >= address_data->ignore_range[i + 1]) && |
||
| 90 | (addr <= address_data->ignore_range[i + 2])) { |
||
| 91 | dev_dbg(&adapter->dev, "found ignore_range parameter for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 92 | found = 1; |
||
| 93 | } |
||
| 94 | } |
||
| 95 | if (found) |
||
| 96 | continue; |
||
| 97 | |||
| 98 | /* Now, we will do a detection, but only if it is in the normal or |
||
| 99 | probe entries */ |
||
| 100 | if (is_isa) { |
||
| 101 | for (i = 0; !found && (address_data->normal_isa[i] != I2C_CLIENT_ISA_END); i += 1) { |
||
| 102 | if (addr == address_data->normal_isa[i]) { |
||
| 103 | dev_dbg(&adapter->dev, "found normal isa entry for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 104 | found = 1; |
||
| 105 | } |
||
| 106 | } |
||
| 107 | for (i = 0; !found && (address_data->normal_isa_range[i] != I2C_CLIENT_ISA_END); i += 3) { |
||
| 108 | if ((addr >= address_data->normal_isa_range[i]) && |
||
| 109 | (addr <= address_data->normal_isa_range[i + 1]) && |
||
| 110 | ((addr - address_data->normal_isa_range[i]) % address_data->normal_isa_range[i + 2] == 0)) { |
||
| 111 | dev_dbg(&adapter->dev, "found normal isa_range entry for adapter %d, addr %04x", adapter_id, addr); |
||
| 112 | found = 1; |
||
| 113 | } |
||
| 114 | } |
||
| 115 | } else { |
||
| 116 | for (i = 0; !found && (address_data->normal_i2c[i] != I2C_CLIENT_END); i += 1) { |
||
| 117 | if (addr == address_data->normal_i2c[i]) { |
||
| 118 | found = 1; |
||
| 119 | dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x", adapter_id, addr); |
||
| 120 | } |
||
| 121 | } |
||
| 122 | for (i = 0; !found && (address_data->normal_i2c_range[i] != I2C_CLIENT_END); i += 2) { |
||
| 123 | if ((addr >= address_data->normal_i2c_range[i]) && |
||
| 124 | (addr <= address_data->normal_i2c_range[i + 1])) { |
||
| 125 | dev_dbg(&adapter->dev, "found normal i2c_range entry for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 126 | found = 1; |
||
| 127 | } |
||
| 128 | } |
||
| 129 | } |
||
| 130 | |||
| 131 | for (i = 0; |
||
| 132 | !found && (address_data->probe[i] != I2C_CLIENT_END); |
||
| 133 | i += 2) { |
||
| 134 | if (((adapter_id == address_data->probe[i]) || |
||
| 135 | ((address_data-> |
||
| 136 | probe[i] == ANY_I2C_BUS) && !is_isa)) |
||
| 137 | && (addr == address_data->probe[i + 1])) { |
||
| 138 | dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 139 | found = 1; |
||
| 140 | } |
||
| 141 | } |
||
| 142 | for (i = 0; !found && (address_data->probe_range[i] != I2C_CLIENT_END); i += 3) { |
||
| 143 | if ( ((adapter_id == address_data->probe_range[i]) || |
||
| 144 | ((address_data->probe_range[i] == ANY_I2C_BUS) && !is_isa)) && |
||
| 145 | (addr >= address_data->probe_range[i + 1]) && |
||
| 146 | (addr <= address_data->probe_range[i + 2])) { |
||
| 147 | found = 1; |
||
| 148 | dev_dbg(&adapter->dev, "found probe_range parameter for adapter %d, addr %04x\n", adapter_id, addr); |
||
| 149 | } |
||
| 150 | } |
||
| 151 | if (!found) |
||
| 152 | continue; |
||
| 153 | |||
| 154 | /* OK, so we really should examine this address. First check |
||
| 155 | whether there is some client here at all! */ |
||
| 156 | if (is_isa || |
||
| 157 | (i2c_smbus_xfer (adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0)) |
||
| 158 | if ((err = found_proc(adapter, addr, -1))) |
||
| 159 | return err; |
||
| 160 | } |
||
| 161 | return 0; |
||
| 162 | } |
||
| 163 | |||
| 164 | EXPORT_SYMBOL(i2c_detect); |
||
| 165 | |||
| 166 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); |
||
| 167 | MODULE_DESCRIPTION("i2c-sensor driver"); |
||
| 168 | MODULE_LICENSE("GPL"); |