| Guenter Roeck | 8ea3238 | 2011-01-26 20:11:04 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Hardware monitoring driver for Maxim MAX8688 |
| 3 | * |
| 4 | * Copyright (c) 2011 Ericsson AB. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/err.h> |
| 25 | #include <linux/i2c.h> |
| 26 | #include "pmbus.h" |
| 27 | |
| 28 | #define MAX8688_MFG_STATUS 0xd8 |
| 29 | |
| 30 | #define MAX8688_STATUS_OC_FAULT (1 << 4) |
| 31 | #define MAX8688_STATUS_OV_FAULT (1 << 5) |
| 32 | #define MAX8688_STATUS_OV_WARNING (1 << 8) |
| 33 | #define MAX8688_STATUS_UV_FAULT (1 << 9) |
| 34 | #define MAX8688_STATUS_UV_WARNING (1 << 10) |
| 35 | #define MAX8688_STATUS_UC_FAULT (1 << 11) |
| 36 | #define MAX8688_STATUS_OC_WARNING (1 << 12) |
| 37 | #define MAX8688_STATUS_OT_FAULT (1 << 13) |
| 38 | #define MAX8688_STATUS_OT_WARNING (1 << 14) |
| 39 | |
| 40 | static int max8688_get_status(struct i2c_client *client, int page, int reg) |
| 41 | { |
| 42 | int ret = 0; |
| 43 | int mfg_status; |
| 44 | |
| 45 | if (page) |
| 46 | return -EINVAL; |
| 47 | |
| 48 | switch (reg) { |
| 49 | case PMBUS_STATUS_VOUT: |
| 50 | mfg_status = pmbus_read_word_data(client, 0, |
| 51 | MAX8688_MFG_STATUS); |
| 52 | if (mfg_status < 0) |
| 53 | return mfg_status; |
| 54 | if (mfg_status & MAX8688_STATUS_UV_WARNING) |
| 55 | ret |= PB_VOLTAGE_UV_WARNING; |
| 56 | if (mfg_status & MAX8688_STATUS_UV_FAULT) |
| 57 | ret |= PB_VOLTAGE_UV_FAULT; |
| 58 | if (mfg_status & MAX8688_STATUS_OV_WARNING) |
| 59 | ret |= PB_VOLTAGE_OV_WARNING; |
| 60 | if (mfg_status & MAX8688_STATUS_OV_FAULT) |
| 61 | ret |= PB_VOLTAGE_OV_FAULT; |
| 62 | break; |
| 63 | case PMBUS_STATUS_IOUT: |
| 64 | mfg_status = pmbus_read_word_data(client, 0, |
| 65 | MAX8688_MFG_STATUS); |
| 66 | if (mfg_status < 0) |
| 67 | return mfg_status; |
| 68 | if (mfg_status & MAX8688_STATUS_UC_FAULT) |
| 69 | ret |= PB_IOUT_UC_FAULT; |
| 70 | if (mfg_status & MAX8688_STATUS_OC_WARNING) |
| 71 | ret |= PB_IOUT_OC_WARNING; |
| 72 | if (mfg_status & MAX8688_STATUS_OC_FAULT) |
| 73 | ret |= PB_IOUT_OC_FAULT; |
| 74 | break; |
| 75 | case PMBUS_STATUS_TEMPERATURE: |
| 76 | mfg_status = pmbus_read_word_data(client, 0, |
| 77 | MAX8688_MFG_STATUS); |
| 78 | if (mfg_status < 0) |
| 79 | return mfg_status; |
| 80 | if (mfg_status & MAX8688_STATUS_OT_WARNING) |
| 81 | ret |= PB_TEMP_OT_WARNING; |
| 82 | if (mfg_status & MAX8688_STATUS_OT_FAULT) |
| 83 | ret |= PB_TEMP_OT_FAULT; |
| 84 | break; |
| 85 | default: |
| 86 | ret = -ENODATA; |
| 87 | break; |
| 88 | } |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | static struct pmbus_driver_info max8688_info = { |
| 93 | .pages = 1, |
| 94 | .direct[PSC_VOLTAGE_IN] = true, |
| 95 | .direct[PSC_VOLTAGE_OUT] = true, |
| 96 | .direct[PSC_TEMPERATURE] = true, |
| 97 | .direct[PSC_CURRENT_OUT] = true, |
| 98 | .m[PSC_VOLTAGE_IN] = 19995, |
| 99 | .b[PSC_VOLTAGE_IN] = 0, |
| 100 | .R[PSC_VOLTAGE_IN] = -1, |
| 101 | .m[PSC_VOLTAGE_OUT] = 19995, |
| 102 | .b[PSC_VOLTAGE_OUT] = 0, |
| 103 | .R[PSC_VOLTAGE_OUT] = -1, |
| 104 | .m[PSC_CURRENT_OUT] = 23109, |
| 105 | .b[PSC_CURRENT_OUT] = 0, |
| 106 | .R[PSC_CURRENT_OUT] = -2, |
| 107 | .m[PSC_TEMPERATURE] = -7612, |
| 108 | .b[PSC_TEMPERATURE] = 335, |
| 109 | .R[PSC_TEMPERATURE] = -3, |
| 110 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP |
| 111 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
| 112 | | PMBUS_HAVE_STATUS_TEMP, |
| 113 | .get_status = max8688_get_status, |
| 114 | }; |
| 115 | |
| 116 | static int max8688_probe(struct i2c_client *client, |
| 117 | const struct i2c_device_id *id) |
| 118 | { |
| 119 | return pmbus_do_probe(client, id, &max8688_info); |
| 120 | } |
| 121 | |
| 122 | static int max8688_remove(struct i2c_client *client) |
| 123 | { |
| 124 | return pmbus_do_remove(client); |
| 125 | } |
| 126 | |
| 127 | static const struct i2c_device_id max8688_id[] = { |
| 128 | {"max8688", 0}, |
| 129 | { } |
| 130 | }; |
| 131 | |
| 132 | MODULE_DEVICE_TABLE(i2c, max8688_id); |
| 133 | |
| 134 | /* This is the driver that will be inserted */ |
| 135 | static struct i2c_driver max8688_driver = { |
| 136 | .driver = { |
| 137 | .name = "max8688", |
| 138 | }, |
| 139 | .probe = max8688_probe, |
| 140 | .remove = max8688_remove, |
| 141 | .id_table = max8688_id, |
| 142 | }; |
| 143 | |
| 144 | static int __init max8688_init(void) |
| 145 | { |
| 146 | return i2c_add_driver(&max8688_driver); |
| 147 | } |
| 148 | |
| 149 | static void __exit max8688_exit(void) |
| 150 | { |
| 151 | i2c_del_driver(&max8688_driver); |
| 152 | } |
| 153 | |
| 154 | MODULE_AUTHOR("Guenter Roeck"); |
| 155 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688"); |
| 156 | MODULE_LICENSE("GPL"); |
| 157 | module_init(max8688_init); |
| 158 | module_exit(max8688_exit); |