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200855e5 GR |
1 | /* |
2 | * Hardware monitoring driver for ZL6100 and compatibles | |
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/ktime.h> | |
28 | #include <linux/delay.h> | |
29 | #include "pmbus.h" | |
30 | ||
bc581e6f | 31 | enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 }; |
200855e5 GR |
32 | |
33 | struct zl6100_data { | |
34 | int id; | |
35 | ktime_t access; /* chip access time */ | |
36 | struct pmbus_driver_info info; | |
37 | }; | |
38 | ||
39 | #define to_zl6100_data(x) container_of(x, struct zl6100_data, info) | |
40 | ||
56badacb | 41 | #define ZL6100_MFR_CONFIG 0xd0 |
200855e5 GR |
42 | #define ZL6100_DEVICE_ID 0xe4 |
43 | ||
56badacb GR |
44 | #define ZL6100_MFR_XTEMP_ENABLE (1 << 7) |
45 | ||
200855e5 GR |
46 | #define ZL6100_WAIT_TIME 1000 /* uS */ |
47 | ||
48 | static ushort delay = ZL6100_WAIT_TIME; | |
49 | module_param(delay, ushort, 0644); | |
50 | MODULE_PARM_DESC(delay, "Delay between chip accesses in uS"); | |
51 | ||
52 | /* Some chips need a delay between accesses */ | |
53 | static inline void zl6100_wait(const struct zl6100_data *data) | |
54 | { | |
55 | if (delay) { | |
56 | s64 delta = ktime_us_delta(ktime_get(), data->access); | |
57 | if (delta < delay) | |
58 | udelay(delay - delta); | |
59 | } | |
60 | } | |
61 | ||
62 | static int zl6100_read_word_data(struct i2c_client *client, int page, int reg) | |
63 | { | |
64 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
65 | struct zl6100_data *data = to_zl6100_data(info); | |
66 | int ret; | |
67 | ||
68 | if (page || reg >= PMBUS_VIRT_BASE) | |
69 | return -ENXIO; | |
70 | ||
bc581e6f GR |
71 | if (data->id == zl2005) { |
72 | /* | |
73 | * Limit register detection is not reliable on ZL2005. | |
74 | * Make sure registers are not erroneously detected. | |
75 | */ | |
76 | switch (reg) { | |
77 | case PMBUS_VOUT_OV_WARN_LIMIT: | |
78 | case PMBUS_VOUT_UV_WARN_LIMIT: | |
79 | case PMBUS_IOUT_OC_WARN_LIMIT: | |
80 | return -ENXIO; | |
81 | } | |
82 | } | |
83 | ||
200855e5 GR |
84 | zl6100_wait(data); |
85 | ret = pmbus_read_word_data(client, page, reg); | |
86 | data->access = ktime_get(); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg) | |
92 | { | |
93 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
94 | struct zl6100_data *data = to_zl6100_data(info); | |
95 | int ret; | |
96 | ||
97 | if (page > 0) | |
98 | return -ENXIO; | |
99 | ||
100 | zl6100_wait(data); | |
101 | ret = pmbus_read_byte_data(client, page, reg); | |
102 | data->access = ktime_get(); | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
107 | static int zl6100_write_word_data(struct i2c_client *client, int page, int reg, | |
108 | u16 word) | |
109 | { | |
110 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
111 | struct zl6100_data *data = to_zl6100_data(info); | |
112 | int ret; | |
113 | ||
114 | if (page || reg >= PMBUS_VIRT_BASE) | |
115 | return -ENXIO; | |
116 | ||
117 | zl6100_wait(data); | |
118 | ret = pmbus_write_word_data(client, page, reg, word); | |
119 | data->access = ktime_get(); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | static int zl6100_write_byte(struct i2c_client *client, int page, u8 value) | |
125 | { | |
126 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
127 | struct zl6100_data *data = to_zl6100_data(info); | |
128 | int ret; | |
129 | ||
130 | if (page > 0) | |
131 | return -ENXIO; | |
132 | ||
133 | zl6100_wait(data); | |
134 | ret = pmbus_write_byte(client, page, value); | |
135 | data->access = ktime_get(); | |
136 | ||
137 | return ret; | |
138 | } | |
139 | ||
140 | static const struct i2c_device_id zl6100_id[] = { | |
443830f6 GR |
141 | {"bmr450", zl2005}, |
142 | {"bmr451", zl2005}, | |
143 | {"bmr462", zl2008}, | |
144 | {"bmr463", zl2008}, | |
145 | {"bmr464", zl2008}, | |
200855e5 | 146 | {"zl2004", zl2004}, |
bc581e6f | 147 | {"zl2005", zl2005}, |
200855e5 GR |
148 | {"zl2006", zl2006}, |
149 | {"zl2008", zl2008}, | |
150 | {"zl2105", zl2105}, | |
151 | {"zl2106", zl2106}, | |
152 | {"zl6100", zl6100}, | |
153 | {"zl6105", zl6105}, | |
154 | { } | |
155 | }; | |
156 | MODULE_DEVICE_TABLE(i2c, zl6100_id); | |
157 | ||
158 | static int zl6100_probe(struct i2c_client *client, | |
159 | const struct i2c_device_id *id) | |
160 | { | |
161 | int ret; | |
162 | struct zl6100_data *data; | |
163 | struct pmbus_driver_info *info; | |
164 | u8 device_id[I2C_SMBUS_BLOCK_MAX + 1]; | |
165 | const struct i2c_device_id *mid; | |
166 | ||
167 | if (!i2c_check_functionality(client->adapter, | |
56badacb | 168 | I2C_FUNC_SMBUS_READ_WORD_DATA |
200855e5 GR |
169 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
170 | return -ENODEV; | |
171 | ||
172 | ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID, | |
173 | device_id); | |
174 | if (ret < 0) { | |
175 | dev_err(&client->dev, "Failed to read device ID\n"); | |
176 | return ret; | |
177 | } | |
178 | device_id[ret] = '\0'; | |
179 | dev_info(&client->dev, "Device ID %s\n", device_id); | |
180 | ||
181 | mid = NULL; | |
182 | for (mid = zl6100_id; mid->name[0]; mid++) { | |
183 | if (!strncasecmp(mid->name, device_id, strlen(mid->name))) | |
184 | break; | |
185 | } | |
186 | if (!mid->name[0]) { | |
187 | dev_err(&client->dev, "Unsupported device\n"); | |
188 | return -ENODEV; | |
189 | } | |
190 | if (id->driver_data != mid->driver_data) | |
191 | dev_notice(&client->dev, | |
192 | "Device mismatch: Configured %s, detected %s\n", | |
193 | id->name, mid->name); | |
194 | ||
195 | data = kzalloc(sizeof(struct zl6100_data), GFP_KERNEL); | |
196 | if (!data) | |
197 | return -ENOMEM; | |
198 | ||
199 | data->id = mid->driver_data; | |
200 | ||
201 | /* | |
bc581e6f | 202 | * ZL2005, ZL2008, ZL2105, and ZL6100 are known to require a wait time |
200855e5 | 203 | * between I2C accesses. ZL2004 and ZL6105 are known to be safe. |
bc581e6f | 204 | * Other chips have not yet been tested. |
200855e5 GR |
205 | * |
206 | * Only clear the wait time for chips known to be safe. The wait time | |
207 | * can be cleared later for additional chips if tests show that it | |
208 | * is not needed (in other words, better be safe than sorry). | |
209 | */ | |
210 | if (data->id == zl2004 || data->id == zl6105) | |
211 | delay = 0; | |
212 | ||
213 | /* | |
214 | * Since there was a direct I2C device access above, wait before | |
215 | * accessing the chip again. | |
200855e5 GR |
216 | */ |
217 | data->access = ktime_get(); | |
218 | zl6100_wait(data); | |
200855e5 GR |
219 | |
220 | info = &data->info; | |
221 | ||
222 | info->pages = 1; | |
223 | info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
224 | | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
225 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
56badacb GR |
226 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; |
227 | ||
228 | ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG); | |
229 | if (ret < 0) | |
230 | goto err_mem; | |
231 | if (ret & ZL6100_MFR_XTEMP_ENABLE) | |
232 | info->func[0] |= PMBUS_HAVE_TEMP2; | |
233 | ||
234 | data->access = ktime_get(); | |
235 | zl6100_wait(data); | |
200855e5 GR |
236 | |
237 | info->read_word_data = zl6100_read_word_data; | |
238 | info->read_byte_data = zl6100_read_byte_data; | |
239 | info->write_word_data = zl6100_write_word_data; | |
240 | info->write_byte = zl6100_write_byte; | |
241 | ||
242 | ret = pmbus_do_probe(client, mid, info); | |
243 | if (ret) | |
244 | goto err_mem; | |
245 | return 0; | |
246 | ||
247 | err_mem: | |
248 | kfree(data); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | static int zl6100_remove(struct i2c_client *client) | |
253 | { | |
254 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); | |
255 | const struct zl6100_data *data = to_zl6100_data(info); | |
256 | ||
257 | pmbus_do_remove(client); | |
258 | kfree(data); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static struct i2c_driver zl6100_driver = { | |
263 | .driver = { | |
264 | .name = "zl6100", | |
265 | }, | |
266 | .probe = zl6100_probe, | |
267 | .remove = zl6100_remove, | |
268 | .id_table = zl6100_id, | |
269 | }; | |
270 | ||
271 | static int __init zl6100_init(void) | |
272 | { | |
273 | return i2c_add_driver(&zl6100_driver); | |
274 | } | |
275 | ||
276 | static void __exit zl6100_exit(void) | |
277 | { | |
278 | i2c_del_driver(&zl6100_driver); | |
279 | } | |
280 | ||
281 | MODULE_AUTHOR("Guenter Roeck"); | |
282 | MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles"); | |
283 | MODULE_LICENSE("GPL"); | |
284 | module_init(zl6100_init); | |
285 | module_exit(zl6100_exit); |