diff options
author | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-07-29 22:21:53 -0700 |
---|---|---|
committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-10-24 11:09:40 -0700 |
commit | 200855e52db1b1834121ba57fbd89c5b4911e02c (patch) | |
tree | fa0c572e5c40b8558ae2e8fc5069a41c2c503668 /drivers | |
parent | da8e48ab483e1f54c1099bed91bfd2c302bc7ddf (diff) | |
download | linux-200855e52db1b1834121ba57fbd89c5b4911e02c.tar.bz2 |
hwmon: (pmbus) Add support for Intersil power management chips
Add support for Intersil / Zilker Labs ZL2004, ZL2006, ZL2008, ZL2105, ZL2106,
ZL6100, and ZL6105.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/hwmon/pmbus/Kconfig | 11 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/Makefile | 1 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/zl6100.c | 256 |
3 files changed, 268 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 37575582e51a..efaf340651a0 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -98,4 +98,15 @@ config SENSORS_UCD9200 This driver can also be built as a module. If so, the module will be called ucd9200. +config SENSORS_ZL6100 + tristate "Intersil ZL6100 and compatibles" + default n + help + If you say yes here you get hardware monitoring support for Intersil + ZL2004, ZL2006, ZL2008, ZL2105, ZL2106, ZL6100, and ZL6105 Digital + DC/DC Controllers. + + This driver can also be built as a module. If so, the module will + be called zl6100. + endif # PMBUS diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 623eedb1ed9a..b9e4fb421f6c 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_SENSORS_MAX34440) += max34440.o obj-$(CONFIG_SENSORS_MAX8688) += max8688.o obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o +obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c new file mode 100644 index 000000000000..2bc980006f83 --- /dev/null +++ b/drivers/hwmon/pmbus/zl6100.c @@ -0,0 +1,256 @@ +/* + * Hardware monitoring driver for ZL6100 and compatibles + * + * Copyright (c) 2011 Ericsson AB. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/ktime.h> +#include <linux/delay.h> +#include "pmbus.h" + +enum chips { zl2004, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 }; + +struct zl6100_data { + int id; + ktime_t access; /* chip access time */ + struct pmbus_driver_info info; +}; + +#define to_zl6100_data(x) container_of(x, struct zl6100_data, info) + +#define ZL6100_DEVICE_ID 0xe4 + +#define ZL6100_WAIT_TIME 1000 /* uS */ + +static ushort delay = ZL6100_WAIT_TIME; +module_param(delay, ushort, 0644); +MODULE_PARM_DESC(delay, "Delay between chip accesses in uS"); + +/* Some chips need a delay between accesses */ +static inline void zl6100_wait(const struct zl6100_data *data) +{ + if (delay) { + s64 delta = ktime_us_delta(ktime_get(), data->access); + if (delta < delay) + udelay(delay - delta); + } +} + +static int zl6100_read_word_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct zl6100_data *data = to_zl6100_data(info); + int ret; + + if (page || reg >= PMBUS_VIRT_BASE) + return -ENXIO; + + zl6100_wait(data); + ret = pmbus_read_word_data(client, page, reg); + data->access = ktime_get(); + + return ret; +} + +static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct zl6100_data *data = to_zl6100_data(info); + int ret; + + if (page > 0) + return -ENXIO; + + zl6100_wait(data); + ret = pmbus_read_byte_data(client, page, reg); + data->access = ktime_get(); + + return ret; +} + +static int zl6100_write_word_data(struct i2c_client *client, int page, int reg, + u16 word) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct zl6100_data *data = to_zl6100_data(info); + int ret; + + if (page || reg >= PMBUS_VIRT_BASE) + return -ENXIO; + + zl6100_wait(data); + ret = pmbus_write_word_data(client, page, reg, word); + data->access = ktime_get(); + + return ret; +} + +static int zl6100_write_byte(struct i2c_client *client, int page, u8 value) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct zl6100_data *data = to_zl6100_data(info); + int ret; + + if (page > 0) + return -ENXIO; + + zl6100_wait(data); + ret = pmbus_write_byte(client, page, value); + data->access = ktime_get(); + + return ret; +} + +static const struct i2c_device_id zl6100_id[] = { + {"zl2004", zl2004}, + {"zl2006", zl2006}, + {"zl2008", zl2008}, + {"zl2105", zl2105}, + {"zl2106", zl2106}, + {"zl6100", zl6100}, + {"zl6105", zl6105}, + { } +}; +MODULE_DEVICE_TABLE(i2c, zl6100_id); + +static int zl6100_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct zl6100_data *data; + struct pmbus_driver_info *info; + u8 device_id[I2C_SMBUS_BLOCK_MAX + 1]; + const struct i2c_device_id *mid; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA + | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) + return -ENODEV; + + ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID, + device_id); + if (ret < 0) { + dev_err(&client->dev, "Failed to read device ID\n"); + return ret; + } + device_id[ret] = '\0'; + dev_info(&client->dev, "Device ID %s\n", device_id); + + mid = NULL; + for (mid = zl6100_id; mid->name[0]; mid++) { + if (!strncasecmp(mid->name, device_id, strlen(mid->name))) + break; + } + if (!mid->name[0]) { + dev_err(&client->dev, "Unsupported device\n"); + return -ENODEV; + } + if (id->driver_data != mid->driver_data) + dev_notice(&client->dev, + "Device mismatch: Configured %s, detected %s\n", + id->name, mid->name); + + data = kzalloc(sizeof(struct zl6100_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = mid->driver_data; + + /* + * ZL2008, ZL2105, and ZL6100 are known to require a wait time + * between I2C accesses. ZL2004 and ZL6105 are known to be safe. + * + * Only clear the wait time for chips known to be safe. The wait time + * can be cleared later for additional chips if tests show that it + * is not needed (in other words, better be safe than sorry). + */ + if (data->id == zl2004 || data->id == zl6105) + delay = 0; + + /* + * Since there was a direct I2C device access above, wait before + * accessing the chip again. + * Set the timestamp, wait, then set it again. This should provide + * enough buffer time to be safe. + */ + data->access = ktime_get(); + zl6100_wait(data); + data->access = ktime_get(); + + info = &data->info; + + info->pages = 1; + info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT + | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; + + info->read_word_data = zl6100_read_word_data; + info->read_byte_data = zl6100_read_byte_data; + info->write_word_data = zl6100_write_word_data; + info->write_byte = zl6100_write_byte; + + ret = pmbus_do_probe(client, mid, info); + if (ret) + goto err_mem; + return 0; + +err_mem: + kfree(data); + return ret; +} + +static int zl6100_remove(struct i2c_client *client) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + const struct zl6100_data *data = to_zl6100_data(info); + + pmbus_do_remove(client); + kfree(data); + return 0; +} + +static struct i2c_driver zl6100_driver = { + .driver = { + .name = "zl6100", + }, + .probe = zl6100_probe, + .remove = zl6100_remove, + .id_table = zl6100_id, +}; + +static int __init zl6100_init(void) +{ + return i2c_add_driver(&zl6100_driver); +} + +static void __exit zl6100_exit(void) +{ + i2c_del_driver(&zl6100_driver); +} + +MODULE_AUTHOR("Guenter Roeck"); +MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles"); +MODULE_LICENSE("GPL"); +module_init(zl6100_init); +module_exit(zl6100_exit); |