Loading...
1/*
2 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
3 * Controller series
4 *
5 * Copyright (C) 2011 Ericsson AB.
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#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/err.h>
26#include <linux/slab.h>
27#include <linux/i2c.h>
28#include <linux/i2c/pmbus.h>
29#include "pmbus.h"
30
31enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
32
33#define UCD9000_MONITOR_CONFIG 0xd5
34#define UCD9000_NUM_PAGES 0xd6
35#define UCD9000_FAN_CONFIG_INDEX 0xe7
36#define UCD9000_FAN_CONFIG 0xe8
37#define UCD9000_DEVICE_ID 0xfd
38
39#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
40#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
41
42#define UCD9000_MON_VOLTAGE 1
43#define UCD9000_MON_TEMPERATURE 2
44#define UCD9000_MON_CURRENT 3
45#define UCD9000_MON_VOLTAGE_HW 4
46
47#define UCD9000_NUM_FAN 4
48
49struct ucd9000_data {
50 u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
51 struct pmbus_driver_info info;
52};
53#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
54
55static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
56{
57 int fan_config = 0;
58 struct ucd9000_data *data
59 = to_ucd9000_data(pmbus_get_driver_info(client));
60
61 if (data->fan_data[fan][3] & 1)
62 fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
63
64 /* Pulses/revolution */
65 fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
66
67 return fan_config;
68}
69
70static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
71{
72 int ret = 0;
73 int fan_config;
74
75 switch (reg) {
76 case PMBUS_FAN_CONFIG_12:
77 if (page > 0)
78 return -ENXIO;
79
80 ret = ucd9000_get_fan_config(client, 0);
81 if (ret < 0)
82 return ret;
83 fan_config = ret << 4;
84 ret = ucd9000_get_fan_config(client, 1);
85 if (ret < 0)
86 return ret;
87 fan_config |= ret;
88 ret = fan_config;
89 break;
90 case PMBUS_FAN_CONFIG_34:
91 if (page > 0)
92 return -ENXIO;
93
94 ret = ucd9000_get_fan_config(client, 2);
95 if (ret < 0)
96 return ret;
97 fan_config = ret << 4;
98 ret = ucd9000_get_fan_config(client, 3);
99 if (ret < 0)
100 return ret;
101 fan_config |= ret;
102 ret = fan_config;
103 break;
104 default:
105 ret = -ENODATA;
106 break;
107 }
108 return ret;
109}
110
111static const struct i2c_device_id ucd9000_id[] = {
112 {"ucd9000", ucd9000},
113 {"ucd90120", ucd90120},
114 {"ucd90124", ucd90124},
115 {"ucd9090", ucd9090},
116 {"ucd90910", ucd90910},
117 {}
118};
119MODULE_DEVICE_TABLE(i2c, ucd9000_id);
120
121static int ucd9000_probe(struct i2c_client *client,
122 const struct i2c_device_id *id)
123{
124 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
125 struct ucd9000_data *data;
126 struct pmbus_driver_info *info;
127 const struct i2c_device_id *mid;
128 int i, ret;
129
130 if (!i2c_check_functionality(client->adapter,
131 I2C_FUNC_SMBUS_BYTE_DATA |
132 I2C_FUNC_SMBUS_BLOCK_DATA))
133 return -ENODEV;
134
135 ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
136 block_buffer);
137 if (ret < 0) {
138 dev_err(&client->dev, "Failed to read device ID\n");
139 return ret;
140 }
141 block_buffer[ret] = '\0';
142 dev_info(&client->dev, "Device ID %s\n", block_buffer);
143
144 for (mid = ucd9000_id; mid->name[0]; mid++) {
145 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
146 break;
147 }
148 if (!mid->name[0]) {
149 dev_err(&client->dev, "Unsupported device\n");
150 return -ENODEV;
151 }
152
153 if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
154 dev_notice(&client->dev,
155 "Device mismatch: Configured %s, detected %s\n",
156 id->name, mid->name);
157
158 data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
159 GFP_KERNEL);
160 if (!data)
161 return -ENOMEM;
162 info = &data->info;
163
164 ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
165 if (ret < 0) {
166 dev_err(&client->dev,
167 "Failed to read number of active pages\n");
168 return ret;
169 }
170 info->pages = ret;
171 if (!info->pages) {
172 dev_err(&client->dev, "No pages configured\n");
173 return -ENODEV;
174 }
175
176 /* The internal temperature sensor is always active */
177 info->func[0] = PMBUS_HAVE_TEMP;
178
179 /* Everything else is configurable */
180 ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
181 block_buffer);
182 if (ret <= 0) {
183 dev_err(&client->dev, "Failed to read configuration data\n");
184 return -ENODEV;
185 }
186 for (i = 0; i < ret; i++) {
187 int page = UCD9000_MON_PAGE(block_buffer[i]);
188
189 if (page >= info->pages)
190 continue;
191
192 switch (UCD9000_MON_TYPE(block_buffer[i])) {
193 case UCD9000_MON_VOLTAGE:
194 case UCD9000_MON_VOLTAGE_HW:
195 info->func[page] |= PMBUS_HAVE_VOUT
196 | PMBUS_HAVE_STATUS_VOUT;
197 break;
198 case UCD9000_MON_TEMPERATURE:
199 info->func[page] |= PMBUS_HAVE_TEMP2
200 | PMBUS_HAVE_STATUS_TEMP;
201 break;
202 case UCD9000_MON_CURRENT:
203 info->func[page] |= PMBUS_HAVE_IOUT
204 | PMBUS_HAVE_STATUS_IOUT;
205 break;
206 default:
207 break;
208 }
209 }
210
211 /* Fan configuration */
212 if (mid->driver_data == ucd90124) {
213 for (i = 0; i < UCD9000_NUM_FAN; i++) {
214 i2c_smbus_write_byte_data(client,
215 UCD9000_FAN_CONFIG_INDEX, i);
216 ret = i2c_smbus_read_block_data(client,
217 UCD9000_FAN_CONFIG,
218 data->fan_data[i]);
219 if (ret < 0)
220 return ret;
221 }
222 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
223
224 info->read_byte_data = ucd9000_read_byte_data;
225 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
226 | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
227 }
228
229 return pmbus_do_probe(client, mid, info);
230}
231
232/* This is the driver that will be inserted */
233static struct i2c_driver ucd9000_driver = {
234 .driver = {
235 .name = "ucd9000",
236 },
237 .probe = ucd9000_probe,
238 .remove = pmbus_do_remove,
239 .id_table = ucd9000_id,
240};
241
242module_i2c_driver(ucd9000_driver);
243
244MODULE_AUTHOR("Guenter Roeck");
245MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
246MODULE_LICENSE("GPL");