diff options
Diffstat (limited to 'drivers/hwmon/pmbus/pmbus.c')
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c new file mode 100644 index 000000000..d0d386990 --- /dev/null +++ b/drivers/hwmon/pmbus/pmbus.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hardware monitoring driver for PMBus devices + * + * Copyright (c) 2010, 2011 Ericsson AB. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/i2c.h> +#include <linux/pmbus.h> +#include "pmbus.h" + +struct pmbus_device_info { + int pages; + u32 flags; +}; + +static const struct i2c_device_id pmbus_id[]; + +/* + * Find sensor groups and status registers on each page. + */ +static void pmbus_find_sensor_groups(struct i2c_client *client, + struct pmbus_driver_info *info) +{ + int page; + + /* Sensors detected on page 0 only */ + if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN)) + info->func[0] |= PMBUS_HAVE_VIN; + if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP)) + info->func[0] |= PMBUS_HAVE_VCAP; + if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN)) + info->func[0] |= PMBUS_HAVE_IIN; + if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN)) + info->func[0] |= PMBUS_HAVE_PIN; + if (info->func[0] + && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT)) + info->func[0] |= PMBUS_HAVE_STATUS_INPUT; + if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) && + pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) { + info->func[0] |= PMBUS_HAVE_FAN12; + if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12)) + info->func[0] |= PMBUS_HAVE_STATUS_FAN12; + } + if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) && + pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) { + info->func[0] |= PMBUS_HAVE_FAN34; + if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34)) + info->func[0] |= PMBUS_HAVE_STATUS_FAN34; + } + if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1)) + info->func[0] |= PMBUS_HAVE_TEMP; + if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2)) + info->func[0] |= PMBUS_HAVE_TEMP2; + if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3)) + info->func[0] |= PMBUS_HAVE_TEMP3; + if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 + | PMBUS_HAVE_TEMP3) + && pmbus_check_byte_register(client, 0, + PMBUS_STATUS_TEMPERATURE)) + info->func[0] |= PMBUS_HAVE_STATUS_TEMP; + + /* Sensors detected on all pages */ + for (page = 0; page < info->pages; page++) { + if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) { + info->func[page] |= PMBUS_HAVE_VOUT; + if (pmbus_check_byte_register(client, page, + PMBUS_STATUS_VOUT)) + info->func[page] |= PMBUS_HAVE_STATUS_VOUT; + } + if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) { + info->func[page] |= PMBUS_HAVE_IOUT; + if (pmbus_check_byte_register(client, 0, + PMBUS_STATUS_IOUT)) + info->func[page] |= PMBUS_HAVE_STATUS_IOUT; + } + if (pmbus_check_word_register(client, page, PMBUS_READ_POUT)) + info->func[page] |= PMBUS_HAVE_POUT; + } +} + +/* + * Identify chip parameters. + */ +static int pmbus_identify(struct i2c_client *client, + struct pmbus_driver_info *info) +{ + int ret = 0; + + if (!info->pages) { + /* + * Check if the PAGE command is supported. If it is, + * keep setting the page number until it fails or until the + * maximum number of pages has been reached. Assume that + * this is the number of pages supported by the chip. + */ + if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) { + int page; + + for (page = 1; page < PMBUS_PAGES; page++) { + if (pmbus_set_page(client, page, 0xff) < 0) + break; + } + pmbus_set_page(client, 0, 0xff); + info->pages = page; + } else { + info->pages = 1; + } + + pmbus_clear_faults(client); + } + + if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) { + int vout_mode, i; + + vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); + if (vout_mode >= 0 && vout_mode != 0xff) { + switch (vout_mode >> 5) { + case 0: + break; + case 1: + info->format[PSC_VOLTAGE_OUT] = vid; + for (i = 0; i < info->pages; i++) + info->vrm_version[i] = vr11; + break; + case 2: + info->format[PSC_VOLTAGE_OUT] = direct; + break; + default: + ret = -ENODEV; + goto abort; + } + } + } + + /* + * We should check if the COEFFICIENTS register is supported. + * If it is, and the chip is configured for direct mode, we can read + * the coefficients from the chip, one set per group of sensor + * registers. + * + * To do this, we will need access to a chip which actually supports the + * COEFFICIENTS command, since the command is too complex to implement + * without testing it. Until then, abort if a chip configured for direct + * mode was detected. + */ + if (info->format[PSC_VOLTAGE_OUT] == direct) { + ret = -ENODEV; + goto abort; + } + + /* Try to find sensor groups */ + pmbus_find_sensor_groups(client, info); +abort: + return ret; +} + +static int pmbus_probe(struct i2c_client *client) +{ + struct pmbus_driver_info *info; + struct pmbus_platform_data *pdata = NULL; + struct device *dev = &client->dev; + struct pmbus_device_info *device_info; + + info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + device_info = (struct pmbus_device_info *)i2c_match_id(pmbus_id, client)->driver_data; + if (device_info->flags) { + pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data), + GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + pdata->flags = device_info->flags; + } + + info->pages = device_info->pages; + info->identify = pmbus_identify; + dev->platform_data = pdata; + + return pmbus_do_probe(client, info); +} + +static const struct pmbus_device_info pmbus_info_one = { + .pages = 1, + .flags = 0 +}; + +static const struct pmbus_device_info pmbus_info_zero = { + .pages = 0, + .flags = 0 +}; + +static const struct pmbus_device_info pmbus_info_one_skip = { + .pages = 1, + .flags = PMBUS_SKIP_STATUS_CHECK +}; + +static const struct pmbus_device_info pmbus_info_one_status = { + .pages = 1, + .flags = PMBUS_READ_STATUS_AFTER_FAILED_CHECK +}; + +/* + * Use driver_data to set the number of pages supported by the chip. + */ +static const struct i2c_device_id pmbus_id[] = { + {"adp4000", (kernel_ulong_t)&pmbus_info_one}, + {"bmr310", (kernel_ulong_t)&pmbus_info_one_status}, + {"bmr453", (kernel_ulong_t)&pmbus_info_one}, + {"bmr454", (kernel_ulong_t)&pmbus_info_one}, + {"bmr456", (kernel_ulong_t)&pmbus_info_one}, + {"bmr457", (kernel_ulong_t)&pmbus_info_one}, + {"bmr458", (kernel_ulong_t)&pmbus_info_one_status}, + {"bmr480", (kernel_ulong_t)&pmbus_info_one_status}, + {"bmr490", (kernel_ulong_t)&pmbus_info_one_status}, + {"bmr491", (kernel_ulong_t)&pmbus_info_one_status}, + {"bmr492", (kernel_ulong_t)&pmbus_info_one}, + {"dps460", (kernel_ulong_t)&pmbus_info_one_skip}, + {"dps650ab", (kernel_ulong_t)&pmbus_info_one_skip}, + {"dps800", (kernel_ulong_t)&pmbus_info_one_skip}, + {"max20796", (kernel_ulong_t)&pmbus_info_one}, + {"mdt040", (kernel_ulong_t)&pmbus_info_one}, + {"ncp4200", (kernel_ulong_t)&pmbus_info_one}, + {"ncp4208", (kernel_ulong_t)&pmbus_info_one}, + {"pdt003", (kernel_ulong_t)&pmbus_info_one}, + {"pdt006", (kernel_ulong_t)&pmbus_info_one}, + {"pdt012", (kernel_ulong_t)&pmbus_info_one}, + {"pmbus", (kernel_ulong_t)&pmbus_info_zero}, + {"sgd009", (kernel_ulong_t)&pmbus_info_one_skip}, + {"tps40400", (kernel_ulong_t)&pmbus_info_one}, + {"tps544b20", (kernel_ulong_t)&pmbus_info_one}, + {"tps544b25", (kernel_ulong_t)&pmbus_info_one}, + {"tps544c20", (kernel_ulong_t)&pmbus_info_one}, + {"tps544c25", (kernel_ulong_t)&pmbus_info_one}, + {"udt020", (kernel_ulong_t)&pmbus_info_one}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, pmbus_id); + +/* This is the driver that will be inserted */ +static struct i2c_driver pmbus_driver = { + .driver = { + .name = "pmbus", + }, + .probe_new = pmbus_probe, + .id_table = pmbus_id, +}; + +module_i2c_driver(pmbus_driver); + +MODULE_AUTHOR("Guenter Roeck"); +MODULE_DESCRIPTION("Generic PMBus driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS); |