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0c0a0615 GR |
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 | ||
31 | enum 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 | ||
49 | struct 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 | ||
55 | static 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 | ||
70 | static 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: | |
da8e48ab | 77 | if (page > 0) |
179144a0 | 78 | return -ENXIO; |
0c0a0615 GR |
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: | |
da8e48ab | 91 | if (page > 0) |
179144a0 | 92 | return -ENXIO; |
0c0a0615 GR |
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 | ||
111 | static const struct i2c_device_id ucd9000_id[] = { | |
112 | {"ucd9000", ucd9000}, | |
113 | {"ucd90120", ucd90120}, | |
114 | {"ucd90124", ucd90124}, | |
115 | {"ucd9090", ucd9090}, | |
116 | {"ucd90910", ucd90910}, | |
117 | {} | |
118 | }; | |
119 | MODULE_DEVICE_TABLE(i2c, ucd9000_id); | |
120 | ||
121 | static 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 | ||
f020b007 | 144 | for (mid = ucd9000_id; mid->name[0]; mid++) { |
0c0a0615 GR |
145 | if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) |
146 | break; | |
147 | } | |
f020b007 | 148 | if (!mid->name[0]) { |
0c0a0615 GR |
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 | ||
8b313ca7 GR |
158 | data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data), |
159 | GFP_KERNEL); | |
0c0a0615 GR |
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"); | |
8b313ca7 | 168 | return ret; |
0c0a0615 GR |
169 | } |
170 | info->pages = ret; | |
171 | if (!info->pages) { | |
172 | dev_err(&client->dev, "No pages configured\n"); | |
8b313ca7 | 173 | return -ENODEV; |
0c0a0615 GR |
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"); | |
8b313ca7 | 184 | return -ENODEV; |
0c0a0615 GR |
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) | |
8b313ca7 | 220 | return ret; |
0c0a0615 GR |
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 | ||
8b313ca7 | 229 | return pmbus_do_probe(client, mid, info); |
0c0a0615 GR |
230 | } |
231 | ||
0c0a0615 GR |
232 | /* This is the driver that will be inserted */ |
233 | static struct i2c_driver ucd9000_driver = { | |
234 | .driver = { | |
235 | .name = "ucd9000", | |
236 | }, | |
237 | .probe = ucd9000_probe, | |
dd285ad7 | 238 | .remove = pmbus_do_remove, |
0c0a0615 GR |
239 | .id_table = ucd9000_id, |
240 | }; | |
241 | ||
f0967eea | 242 | module_i2c_driver(ucd9000_driver); |
0c0a0615 GR |
243 | |
244 | MODULE_AUTHOR("Guenter Roeck"); | |
245 | MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx"); | |
246 | MODULE_LICENSE("GPL"); |