Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers |
| 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/slab.h> |
| 26 | #include <linux/i2c.h> |
| 27 | #include <linux/i2c/pmbus.h> |
| 28 | #include "pmbus.h" |
| 29 | |
| 30 | #define UCD9200_PHASE_INFO 0xd2 |
| 31 | #define UCD9200_DEVICE_ID 0xfd |
| 32 | |
| 33 | enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246, |
| 34 | ucd9248 }; |
| 35 | |
| 36 | static const struct i2c_device_id ucd9200_id[] = { |
| 37 | {"ucd9200", ucd9200}, |
| 38 | {"ucd9220", ucd9220}, |
| 39 | {"ucd9222", ucd9222}, |
| 40 | {"ucd9224", ucd9224}, |
| 41 | {"ucd9240", ucd9240}, |
| 42 | {"ucd9244", ucd9244}, |
| 43 | {"ucd9246", ucd9246}, |
| 44 | {"ucd9248", ucd9248}, |
| 45 | {} |
| 46 | }; |
| 47 | MODULE_DEVICE_TABLE(i2c, ucd9200_id); |
| 48 | |
| 49 | static int ucd9200_probe(struct i2c_client *client, |
| 50 | const struct i2c_device_id *id) |
| 51 | { |
| 52 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; |
| 53 | struct pmbus_driver_info *info; |
| 54 | const struct i2c_device_id *mid; |
| 55 | int i, j, ret; |
| 56 | |
| 57 | if (!i2c_check_functionality(client->adapter, |
| 58 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 59 | I2C_FUNC_SMBUS_BLOCK_DATA)) |
| 60 | return -ENODEV; |
| 61 | |
| 62 | ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID, |
| 63 | block_buffer); |
| 64 | if (ret < 0) { |
| 65 | dev_err(&client->dev, "Failed to read device ID\n"); |
| 66 | return ret; |
| 67 | } |
| 68 | block_buffer[ret] = '\0'; |
| 69 | dev_info(&client->dev, "Device ID %s\n", block_buffer); |
| 70 | |
Jean Delvare | f020b00 | 2011-08-31 11:53:41 -0400 | [diff] [blame] | 71 | for (mid = ucd9200_id; mid->name[0]; mid++) { |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 72 | if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) |
| 73 | break; |
| 74 | } |
Jean Delvare | f020b00 | 2011-08-31 11:53:41 -0400 | [diff] [blame] | 75 | if (!mid->name[0]) { |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 76 | dev_err(&client->dev, "Unsupported device\n"); |
| 77 | return -ENODEV; |
| 78 | } |
| 79 | if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data) |
| 80 | dev_notice(&client->dev, |
| 81 | "Device mismatch: Configured %s, detected %s\n", |
| 82 | id->name, mid->name); |
| 83 | |
| 84 | info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL); |
| 85 | if (!info) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO, |
| 89 | block_buffer); |
| 90 | if (ret < 0) { |
| 91 | dev_err(&client->dev, "Failed to read phase information\n"); |
| 92 | goto out; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Calculate number of configured pages (rails) from PHASE_INFO |
| 97 | * register. |
| 98 | * Rails have to be sequential, so we can abort after finding |
| 99 | * the first unconfigured rail. |
| 100 | */ |
| 101 | info->pages = 0; |
| 102 | for (i = 0; i < ret; i++) { |
| 103 | if (!block_buffer[i]) |
| 104 | break; |
| 105 | info->pages++; |
| 106 | } |
| 107 | if (!info->pages) { |
| 108 | dev_err(&client->dev, "No rails configured\n"); |
| 109 | ret = -ENODEV; |
| 110 | goto out; |
| 111 | } |
| 112 | dev_info(&client->dev, "%d rails configured\n", info->pages); |
| 113 | |
| 114 | /* |
| 115 | * Set PHASE registers on all pages to 0xff to ensure that phase |
| 116 | * specific commands will apply to all phases of a given page (rail). |
| 117 | * This only affects the READ_IOUT and READ_TEMPERATURE2 registers. |
| 118 | * READ_IOUT will return the sum of currents of all phases of a rail, |
| 119 | * and READ_TEMPERATURE2 will return the maximum temperature detected |
| 120 | * for the the phases of the rail. |
| 121 | */ |
| 122 | for (i = 0; i < info->pages; i++) { |
| 123 | /* |
| 124 | * Setting PAGE & PHASE fails once in a while for no obvious |
| 125 | * reason, so we need to retry a couple of times. |
| 126 | */ |
| 127 | for (j = 0; j < 3; j++) { |
| 128 | ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); |
| 129 | if (ret < 0) |
| 130 | continue; |
| 131 | ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE, |
| 132 | 0xff); |
| 133 | if (ret < 0) |
| 134 | continue; |
| 135 | break; |
| 136 | } |
| 137 | if (ret < 0) { |
| 138 | dev_err(&client->dev, |
| 139 | "Failed to initialize PHASE registers\n"); |
| 140 | goto out; |
| 141 | } |
| 142 | } |
| 143 | if (info->pages > 1) |
| 144 | i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); |
| 145 | |
| 146 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
| 147 | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
| 148 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
| 149 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
| 150 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
| 151 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
| 152 | |
| 153 | for (i = 1; i < info->pages; i++) |
| 154 | info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
| 155 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
| 156 | PMBUS_HAVE_POUT | |
| 157 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
| 158 | |
| 159 | /* ucd9240 supports a single fan */ |
| 160 | if (mid->driver_data == ucd9240) |
| 161 | info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12; |
| 162 | |
| 163 | ret = pmbus_do_probe(client, mid, info); |
| 164 | if (ret < 0) |
| 165 | goto out; |
| 166 | return 0; |
| 167 | out: |
| 168 | kfree(info); |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | static int ucd9200_remove(struct i2c_client *client) |
| 173 | { |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 174 | const struct pmbus_driver_info *info; |
| 175 | |
| 176 | info = pmbus_get_driver_info(client); |
Guenter Roeck | 866cf12 | 2011-08-26 08:12:38 -0700 | [diff] [blame] | 177 | pmbus_do_remove(client); |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 178 | kfree(info); |
Guenter Roeck | 866cf12 | 2011-08-26 08:12:38 -0700 | [diff] [blame] | 179 | return 0; |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | |
| 183 | /* This is the driver that will be inserted */ |
| 184 | static struct i2c_driver ucd9200_driver = { |
| 185 | .driver = { |
| 186 | .name = "ucd9200", |
| 187 | }, |
| 188 | .probe = ucd9200_probe, |
| 189 | .remove = ucd9200_remove, |
| 190 | .id_table = ucd9200_id, |
| 191 | }; |
| 192 | |
Axel Lin | f0967ee | 2012-01-20 15:38:18 +0800 | [diff] [blame] | 193 | module_i2c_driver(ucd9200_driver); |
Guenter Roeck | 84fc458 | 2011-03-06 15:54:27 -0800 | [diff] [blame] | 194 | |
| 195 | MODULE_AUTHOR("Guenter Roeck"); |
| 196 | MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x"); |
| 197 | MODULE_LICENSE("GPL"); |