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