Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 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 | |
Guenter Roeck | 3360a10 | 2012-02-28 13:18:47 -0800 | [diff] [blame^] | 31 | enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105, |
| 32 | zl9101, zl9117 }; |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 33 | |
| 34 | struct zl6100_data { |
| 35 | int id; |
| 36 | ktime_t access; /* chip access time */ |
Guenter Roeck | 7ad6307 | 2012-03-07 03:58:55 -0800 | [diff] [blame] | 37 | int delay; /* Delay between chip accesses in uS */ |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 38 | struct pmbus_driver_info info; |
| 39 | }; |
| 40 | |
| 41 | #define to_zl6100_data(x) container_of(x, struct zl6100_data, info) |
| 42 | |
Guenter Roeck | 56badac | 2011-10-04 17:26:04 -0700 | [diff] [blame] | 43 | #define ZL6100_MFR_CONFIG 0xd0 |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 44 | #define ZL6100_DEVICE_ID 0xe4 |
| 45 | |
Guenter Roeck | 56badac | 2011-10-04 17:26:04 -0700 | [diff] [blame] | 46 | #define ZL6100_MFR_XTEMP_ENABLE (1 << 7) |
| 47 | |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 48 | #define ZL6100_WAIT_TIME 1000 /* uS */ |
| 49 | |
| 50 | static ushort delay = ZL6100_WAIT_TIME; |
| 51 | module_param(delay, ushort, 0644); |
| 52 | MODULE_PARM_DESC(delay, "Delay between chip accesses in uS"); |
| 53 | |
| 54 | /* Some chips need a delay between accesses */ |
| 55 | static inline void zl6100_wait(const struct zl6100_data *data) |
| 56 | { |
Guenter Roeck | 7ad6307 | 2012-03-07 03:58:55 -0800 | [diff] [blame] | 57 | if (data->delay) { |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 58 | s64 delta = ktime_us_delta(ktime_get(), data->access); |
Guenter Roeck | 7ad6307 | 2012-03-07 03:58:55 -0800 | [diff] [blame] | 59 | if (delta < data->delay) |
| 60 | udelay(data->delay - delta); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 61 | } |
| 62 | } |
| 63 | |
| 64 | static int zl6100_read_word_data(struct i2c_client *client, int page, int reg) |
| 65 | { |
| 66 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); |
| 67 | struct zl6100_data *data = to_zl6100_data(info); |
| 68 | int ret; |
| 69 | |
| 70 | if (page || reg >= PMBUS_VIRT_BASE) |
| 71 | return -ENXIO; |
| 72 | |
Guenter Roeck | bc581e6 | 2011-10-01 16:50:36 -0700 | [diff] [blame] | 73 | if (data->id == zl2005) { |
| 74 | /* |
| 75 | * Limit register detection is not reliable on ZL2005. |
| 76 | * Make sure registers are not erroneously detected. |
| 77 | */ |
| 78 | switch (reg) { |
| 79 | case PMBUS_VOUT_OV_WARN_LIMIT: |
| 80 | case PMBUS_VOUT_UV_WARN_LIMIT: |
| 81 | case PMBUS_IOUT_OC_WARN_LIMIT: |
| 82 | return -ENXIO; |
| 83 | } |
| 84 | } |
| 85 | |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 86 | zl6100_wait(data); |
| 87 | ret = pmbus_read_word_data(client, page, reg); |
| 88 | data->access = ktime_get(); |
| 89 | |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg) |
| 94 | { |
| 95 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); |
| 96 | struct zl6100_data *data = to_zl6100_data(info); |
| 97 | int ret; |
| 98 | |
| 99 | if (page > 0) |
| 100 | return -ENXIO; |
| 101 | |
| 102 | zl6100_wait(data); |
| 103 | ret = pmbus_read_byte_data(client, page, reg); |
| 104 | data->access = ktime_get(); |
| 105 | |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | static int zl6100_write_word_data(struct i2c_client *client, int page, int reg, |
| 110 | u16 word) |
| 111 | { |
| 112 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); |
| 113 | struct zl6100_data *data = to_zl6100_data(info); |
| 114 | int ret; |
| 115 | |
| 116 | if (page || reg >= PMBUS_VIRT_BASE) |
| 117 | return -ENXIO; |
| 118 | |
| 119 | zl6100_wait(data); |
| 120 | ret = pmbus_write_word_data(client, page, reg, word); |
| 121 | data->access = ktime_get(); |
| 122 | |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | static int zl6100_write_byte(struct i2c_client *client, int page, u8 value) |
| 127 | { |
| 128 | const struct pmbus_driver_info *info = pmbus_get_driver_info(client); |
| 129 | struct zl6100_data *data = to_zl6100_data(info); |
| 130 | int ret; |
| 131 | |
| 132 | if (page > 0) |
| 133 | return -ENXIO; |
| 134 | |
| 135 | zl6100_wait(data); |
| 136 | ret = pmbus_write_byte(client, page, value); |
| 137 | data->access = ktime_get(); |
| 138 | |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | static const struct i2c_device_id zl6100_id[] = { |
Guenter Roeck | 443830f | 2011-10-01 17:35:44 -0700 | [diff] [blame] | 143 | {"bmr450", zl2005}, |
| 144 | {"bmr451", zl2005}, |
| 145 | {"bmr462", zl2008}, |
| 146 | {"bmr463", zl2008}, |
| 147 | {"bmr464", zl2008}, |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 148 | {"zl2004", zl2004}, |
Guenter Roeck | bc581e6 | 2011-10-01 16:50:36 -0700 | [diff] [blame] | 149 | {"zl2005", zl2005}, |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 150 | {"zl2006", zl2006}, |
| 151 | {"zl2008", zl2008}, |
| 152 | {"zl2105", zl2105}, |
| 153 | {"zl2106", zl2106}, |
| 154 | {"zl6100", zl6100}, |
| 155 | {"zl6105", zl6105}, |
Guenter Roeck | 3360a10 | 2012-02-28 13:18:47 -0800 | [diff] [blame^] | 156 | {"zl9101", zl9101}, |
| 157 | {"zl9117", zl9117}, |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 158 | { } |
| 159 | }; |
| 160 | MODULE_DEVICE_TABLE(i2c, zl6100_id); |
| 161 | |
| 162 | static int zl6100_probe(struct i2c_client *client, |
| 163 | const struct i2c_device_id *id) |
| 164 | { |
| 165 | int ret; |
| 166 | struct zl6100_data *data; |
| 167 | struct pmbus_driver_info *info; |
| 168 | u8 device_id[I2C_SMBUS_BLOCK_MAX + 1]; |
| 169 | const struct i2c_device_id *mid; |
| 170 | |
| 171 | if (!i2c_check_functionality(client->adapter, |
Guenter Roeck | 56badac | 2011-10-04 17:26:04 -0700 | [diff] [blame] | 172 | I2C_FUNC_SMBUS_READ_WORD_DATA |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 173 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
| 174 | return -ENODEV; |
| 175 | |
| 176 | ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID, |
| 177 | device_id); |
| 178 | if (ret < 0) { |
| 179 | dev_err(&client->dev, "Failed to read device ID\n"); |
| 180 | return ret; |
| 181 | } |
| 182 | device_id[ret] = '\0'; |
| 183 | dev_info(&client->dev, "Device ID %s\n", device_id); |
| 184 | |
| 185 | mid = NULL; |
| 186 | for (mid = zl6100_id; mid->name[0]; mid++) { |
| 187 | if (!strncasecmp(mid->name, device_id, strlen(mid->name))) |
| 188 | break; |
| 189 | } |
| 190 | if (!mid->name[0]) { |
| 191 | dev_err(&client->dev, "Unsupported device\n"); |
| 192 | return -ENODEV; |
| 193 | } |
| 194 | if (id->driver_data != mid->driver_data) |
| 195 | dev_notice(&client->dev, |
| 196 | "Device mismatch: Configured %s, detected %s\n", |
| 197 | id->name, mid->name); |
| 198 | |
Guenter Roeck | 8b313ca | 2012-02-22 08:56:43 -0800 | [diff] [blame] | 199 | data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data), |
| 200 | GFP_KERNEL); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 201 | if (!data) |
| 202 | return -ENOMEM; |
| 203 | |
| 204 | data->id = mid->driver_data; |
| 205 | |
| 206 | /* |
Guenter Roeck | fecfb64 | 2012-03-13 09:05:14 -0700 | [diff] [blame] | 207 | * According to information from the chip vendor, all currently |
| 208 | * supported chips are known to require a wait time between I2C |
| 209 | * accesses. |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 210 | */ |
Guenter Roeck | 7ad6307 | 2012-03-07 03:58:55 -0800 | [diff] [blame] | 211 | data->delay = delay; |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 212 | |
| 213 | /* |
| 214 | * Since there was a direct I2C device access above, wait before |
| 215 | * accessing the chip again. |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 216 | */ |
| 217 | data->access = ktime_get(); |
| 218 | zl6100_wait(data); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 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 |
Guenter Roeck | 56badac | 2011-10-04 17:26:04 -0700 | [diff] [blame] | 226 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; |
| 227 | |
| 228 | ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG); |
| 229 | if (ret < 0) |
Guenter Roeck | 8b313ca | 2012-02-22 08:56:43 -0800 | [diff] [blame] | 230 | return ret; |
| 231 | |
Guenter Roeck | 56badac | 2011-10-04 17:26:04 -0700 | [diff] [blame] | 232 | if (ret & ZL6100_MFR_XTEMP_ENABLE) |
| 233 | info->func[0] |= PMBUS_HAVE_TEMP2; |
| 234 | |
| 235 | data->access = ktime_get(); |
| 236 | zl6100_wait(data); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 237 | |
| 238 | info->read_word_data = zl6100_read_word_data; |
| 239 | info->read_byte_data = zl6100_read_byte_data; |
| 240 | info->write_word_data = zl6100_write_word_data; |
| 241 | info->write_byte = zl6100_write_byte; |
| 242 | |
Guenter Roeck | 8b313ca | 2012-02-22 08:56:43 -0800 | [diff] [blame] | 243 | return pmbus_do_probe(client, mid, info); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 244 | } |
| 245 | |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 246 | static struct i2c_driver zl6100_driver = { |
| 247 | .driver = { |
| 248 | .name = "zl6100", |
| 249 | }, |
| 250 | .probe = zl6100_probe, |
Guenter Roeck | dd285ad | 2012-02-22 08:56:44 -0800 | [diff] [blame] | 251 | .remove = pmbus_do_remove, |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 252 | .id_table = zl6100_id, |
| 253 | }; |
| 254 | |
Axel Lin | f0967ee | 2012-01-20 15:38:18 +0800 | [diff] [blame] | 255 | module_i2c_driver(zl6100_driver); |
Guenter Roeck | 200855e | 2011-07-29 22:21:53 -0700 | [diff] [blame] | 256 | |
| 257 | MODULE_AUTHOR("Guenter Roeck"); |
| 258 | MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles"); |
| 259 | MODULE_LICENSE("GPL"); |