| Message ID | 20241212214927.3586509-3-ninad@linux.ibm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for Intel CRPS PSU | expand |
On 12/12/24 13:49, Ninad Palsule wrote: > Add the driver to monitor Intel common redundant power supply (crps185) > with hwmon over pmbus. > > Signed-off-by: Ninad Palsule <ninad@linux.ibm.com> > --- > Documentation/hwmon/crps.rst | 95 +++++++++++ Documentation/hwmon/index.rst needs to be updated. > MAINTAINERS | 7 + > drivers/hwmon/pmbus/Kconfig | 9 ++ > drivers/hwmon/pmbus/Makefile | 1 + > drivers/hwmon/pmbus/crps.c | 299 +++++++++++++++++++++++++++++++++++ > 5 files changed, 411 insertions(+) > create mode 100644 Documentation/hwmon/crps.rst > create mode 100644 drivers/hwmon/pmbus/crps.c > > diff --git a/Documentation/hwmon/crps.rst b/Documentation/hwmon/crps.rst > new file mode 100644 > index 000000000000..81d5dfd68a46 > --- /dev/null > +++ b/Documentation/hwmon/crps.rst > @@ -0,0 +1,95 @@ > +.. SPDX-License-Identifier: GPL-2.0-or-later > + > +Kernel driver crps > +======================== I am quite sure that this triggers a documentation warning. > + > +Supported chips: > + > + * Intel CRPS185 > + > + Prefix: 'crps185' > + > + Addresses scanned: - > + > +Authors: > + Ninad Palsule <ninad@linux.ibm.com> > + > + Is the documentation available somewhere ? If yes, please add a reference. If not, add a comment explaining that it is not available to the public. > +Description > +----------- > + > +This driver implements support for Common Redundant Power supply with PMBus For _Intel_ ... > +support. > + > +The driver is a client driver to the core PMBus driver. > +Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers. > + > + > +Usage Notes > +----------- > + > +This driver does not auto-detect devices. You will have to instantiate the > +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for > +details. > + > + > +Sysfs entries > +------------- > + > +======================= ====================================================== > +curr1_label "iin" > +curr1_input Measured input current > +curr1_max Maximum input current > +curr1_max_alarm Input maximum current high alarm > +curr1_crit Critial high input current > +curr1_crit_alarm Input critical current high alarm > +curr1_rated_max Maximum rated input current > + > +curr2_label "iout1" > +curr2_input Measured output current > +curr2_max Maximum output current > +curr2_max_alarm Output maximum current high alarm > +curr2_crit Critial high output current > +curr2_crit_alarm Output critical current high alarm > +curr2_rated_max Maximum rated output current > + > +in1_label "vin" > +in1_input Measured input voltage > +in1_crit Critical input over voltage > +in1_crit_alarm Critical input over voltage alarm > +in1_max Maximum input over voltage > +in1_max_alarm Maximum input over voltage alarm > +in1_rated_min Minimum rated input voltage > +in1_rated_max Maximum rated input voltage > + > +in2_label "vout1" > +in2_input Measured input voltage > +in2_crit Critical input over voltage > +in2_crit_alarm Critical input over voltage alarm > +in2_lcrit Critical input under voltage fault > +in2_lcrit_alarm Critical input under voltage fault alarm > +in2_max Maximum input over voltage > +in2_max_alarm Maximum input over voltage alarm > +in2_min Minimum input under voltage warning > +in2_min_alarm Minimum input under voltage warning alarm > +in2_rated_min Minimum rated input voltage > +in2_rated_max Maximum rated input voltage > + > +power1_label "pin" > +power1_input Measured input power > +power1_alarm Input power high alarm > +power1_max Maximum input power > +power1_rated_max Maximum rated input power > + > +temp[1-2]_input Measured temperature > +temp[1-2]_crit Critical temperature > +temp[1-2]_crit_alarm Critical temperature alarm > +temp[1-2]_max Maximum temperature > +temp[1-2]_max_alarm Maximum temperature alarm > +temp[1-2]_rated_max Maximum rated temperature > + > +fan1_alarm Fan 1 warning. > +fan1_fault Fan 1 fault. > +fan1_input Fan 1 speed in RPM. > +fan1_target Fan 1 target. > +======================= ====================================================== > diff --git a/MAINTAINERS b/MAINTAINERS > index 637ddd44245f..6b31d545f0f1 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -6100,6 +6100,13 @@ L: linux-input@vger.kernel.org > S: Maintained > F: drivers/hid/hid-creative-sb0540.c > > +CRPS COMMON REDUNDANT PSU DRIVER This is _INTEL_ CRPS. > +M: Ninad Palsule <ninad@linux.ibm.com> > +L: linux-hwmon@vger.kernel.org > +S: Maintained > +F: Documentation/hwmon/crps.rst > +F: drivers/hwmon/pmbus/crps.c > + > CRYPTO API > M: Herbert Xu <herbert@gondor.apana.org.au> > M: "David S. Miller" <davem@davemloft.net> > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig > index 22418a05ced0..56c4eb4b846e 100644 > --- a/drivers/hwmon/pmbus/Kconfig > +++ b/drivers/hwmon/pmbus/Kconfig > @@ -85,6 +85,15 @@ config SENSORS_BPA_RS600 > This driver can also be built as a module. If so, the module will > be called bpa-rs600. > > +config SENSORS_CRPS > + tristate "Common Redundant Power Supply" Again, this is an Intel product. > + help > + If you say yes here you get hardware monitoring support for the Common > + Redundant Power Supply. > + > + This driver can also be built as a module. If so, the module will > + be called crps. > + > config SENSORS_DELTA_AHE50DC_FAN > tristate "Delta AHE-50DC fan control module" > help > diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile > index 3d3183f8d2a7..c7eb7739b7f8 100644 > --- a/drivers/hwmon/pmbus/Makefile > +++ b/drivers/hwmon/pmbus/Makefile > @@ -62,3 +62,4 @@ obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o > obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o > obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o > obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o > +obj-$(CONFIG_SENSORS_CRPS) += crps.o > diff --git a/drivers/hwmon/pmbus/crps.c b/drivers/hwmon/pmbus/crps.c > new file mode 100644 > index 000000000000..44d309f81803 > --- /dev/null > +++ b/drivers/hwmon/pmbus/crps.c > @@ -0,0 +1,299 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright 2024 IBM Corp. > + */ > + > +#include <linux/debugfs.h> > +#include <linux/i2c.h> > +#include <linux/of.h> > +#include <linux/pmbus.h> > + > +#include "pmbus.h" > + > +/* Intel crps185 specific commands. */ > +#define CRPS185_MFR_IOUT_MAX 0xA6 > +#define CRPS185_MFR_POUT_MAX 0xA7 > + I fail to see the point in those defines, even more so since PMBUS_MFR_POUT_MAX and PMBUS_MFR_IOUT_MAX are used below. > +enum { > + CRPS_DEBUGFS_PMBUS_REVISION = 0, > + CRPS_DEBUGFS_MAX_POWER_OUT, > + CRPS_DEBUGFS_MAX_CURRENT_OUT, > + CRPS_DEBUGFS_NUM_ENTRIES > +}; > + > +enum models { crps185 = 1, crps_unknown }; Pointless enum. The driver only supports a single power supply. > + > +struct crps { > + enum models version; > + struct i2c_client *client; > + > + int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES]; > +}; > + > +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) > + > +static struct pmbus_platform_data crps_pdata = { > + .flags = PMBUS_SKIP_STATUS_CHECK, > +}; Did you confirm that it is needed ? If so, explain why it is needed. > + > +static const struct i2c_device_id crps_id[] = { > + { "intel_crps185", crps185 }, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, crps_id); > + > +/* > + * Convert linear format word to machine format. 11 LSB side bits are two's > + * complement integer mantissa and 5 MSB side bits are two's complement > + * exponent > + */ > +static int crps_convert_linear(int rc) > +{ > + s16 exponent; > + s32 mantissa; > + s64 val; > + > + exponent = ((s16)rc) >> 11; > + mantissa = ((s16)((rc & 0x7ff) << 5)) >> 5; > + > + val = mantissa; > + if (exponent >= 0) > + val <<= exponent; > + else > + val >>= -exponent; > + > + return (int)val; > +} > + > +static ssize_t crps_debugfs_read(struct file *file, char __user *buf, > + size_t count, loff_t *ppos) > +{ > + int rc; > + int *idxp = file->private_data; > + int idx = *idxp; > + struct crps *psu = to_psu(idxp, idx); > + char data[2 * I2C_SMBUS_BLOCK_MAX] = { 0 }; > + > + rc = pmbus_lock_interruptible(psu->client); > + if (rc) > + return rc; > + > + rc = pmbus_set_page(psu->client, 0, 0xff); > + if (rc) > + goto unlock; > + > + switch (idx) { > + case CRPS_DEBUGFS_PMBUS_REVISION: > + rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION); > + if (rc >= 0) { > + if (psu->version == crps185) { > + if (rc == 0) > + rc = sprintf(data, "%s", "1.0"); > + else if (rc == 0x11) > + rc = sprintf(data, "%s", "1.1"); > + else if (rc == 0x22) > + rc = sprintf(data, "%s", "1.2"); > + else > + rc = snprintf(data, 3, "0x%02x", rc); > + } else { > + rc = snprintf(data, 3, "%02x", rc); > + } > + } This attribute should be added into the PMBus core. > + break; > + case CRPS_DEBUGFS_MAX_POWER_OUT: > + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX); > + if (rc >= 0) { > + rc = crps_convert_linear(rc); > + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); > + } > + break; > + case CRPS_DEBUGFS_MAX_CURRENT_OUT: > + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_IOUT_MAX); > + if (rc >= 0) { > + rc = crps_convert_linear(rc); > + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); > + } > + break; What is the point of those two attributes ? There are already standard sysfs attributes reporting those values. > + default: > + rc = -EINVAL; > + break; > + } > + > +unlock: > + pmbus_unlock(psu->client); > + if (rc < 0) > + return rc; > + > + data[rc] = '\n'; > + rc += 2; > + > + return simple_read_from_buffer(buf, count, ppos, data, rc); > +} > + > +static const struct file_operations crps_debugfs_fops = { > + .llseek = noop_llseek, > + .read = crps_debugfs_read, > + .open = simple_open, > +}; > + > +static int crps_read_word_data(struct i2c_client *client, int page, > + int phase, int reg) > +{ > + int rc; > + > + switch (reg) { > + case PMBUS_STATUS_WORD: > + rc = pmbus_read_word_data(client, page, phase, reg); > + if (rc < 0) > + return rc; > + break; Why is this needed ? > + case PMBUS_OT_WARN_LIMIT: > + rc = pmbus_read_word_data(client, page, phase, > + PMBUS_MFR_MAX_TEMP_1); > + if (rc < 0) > + return rc; > + break; > + case PMBUS_IOUT_OC_WARN_LIMIT: > + rc = pmbus_read_word_data(client, page, phase, > + CRPS185_MFR_IOUT_MAX); > + if (rc < 0) > + return rc; > + break; > + case PMBUS_POUT_OP_WARN_LIMIT: > + rc = pmbus_read_word_data(client, page, phase, > + CRPS185_MFR_POUT_MAX); > + if (rc < 0) > + return rc; > + break; The above three values are more than odd. They duplicate the respective standard rated_max attributes as warning limits. Why ? On top of that, on writes, the actual warning limits are overwritten. That makes even less sense. > + default: > + rc = -ENODATA; > + break; > + } > + > + return rc; > +} > + > +static struct pmbus_driver_info crps_info[] = { > + [crps185] = { > + .pages = 1, > + /* PSU uses default linear data format. */ > + .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | > + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN | > + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | > + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | > + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | > + PMBUS_HAVE_STATUS_TEMP | > + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, > + .read_word_data = crps_read_word_data, > + }, > +}; > + > +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) > + > +static void crps_init_debugfs(struct crps *psu) > +{ > + struct i2c_client *client = psu->client; > + struct dentry *debugfs; > + int i; > + > + /* Don't fail the probe if we can't create debugfs */ > + debugfs = pmbus_get_debugfs_dir(client); > + if (!debugfs) > + return; > + > + for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i) > + psu->debugfs_entries[i] = i; > + > + debugfs_create_file("pmbus_revision", 0444, debugfs, > + &psu->debugfs_entries[CRPS_DEBUGFS_PMBUS_REVISION], > + &crps_debugfs_fops); > + debugfs_create_file("max_power_out", 0444, debugfs, > + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_POWER_OUT], > + &crps_debugfs_fops); > + debugfs_create_file("max_current_out", 0444, debugfs, > + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_CURRENT_OUT], > + &crps_debugfs_fops); > +} > + > +static int crps_probe(struct i2c_client *client) > +{ > + int rc; > + struct device *dev = &client->dev; > + enum models vs = crps_unknown; > + struct crps *psu; > + const void *md = of_device_get_match_data(&client->dev); > + const struct i2c_device_id *id = NULL; > + char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; > + > + if (md) { > + vs = (uintptr_t)md; > + } else { > + id = i2c_match_id(crps_id, client); > + if (id) > + vs = (enum models)id->driver_data; > + } > + Consider using i2c_get_match_data(). > + if (!vs || vs >= crps_unknown) { > + dev_err(dev, "Version %d not supported\n", vs); > + return -EINVAL; > + } This is very much pointless. The driver would not be instantiated withut match. > + > + rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); > + if (rc < 0) { > + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); > + return rc; dev_err_probe(). > + } > + if (strncmp(buf, "03NK260", 7)) { This should also check and ensure that rc == 7. > + buf[rc] = '\0'; > + dev_err(dev, "Model '%s' not supported\n", buf); dev_err_probe() > + return -ENODEV; > + } > + > + client->dev.platform_data = &crps_pdata; > + rc = pmbus_do_probe(client, &crps_info[vs]); > + if (rc) { > + dev_err(dev, "Failed to probe %d\n", rc); > + return rc; dev_err_probe(). > + } > + > + /* > + * Don't fail the probe if there isn't enough memory for debugfs. > + */ > + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); > + if (!psu) { > + dev_warn(dev, "Failed to allocate memory. debugfs are not supported.\n"); > + return 0; > + } > + > + psu->version = vs; > + psu->client = client; > + Drop all this. Add the PMBus version as standard debugfs attribute to the PMBus core if needed/wanted. The rest is already provided as standard sysfs attributes, and reporting the same value in debugfs files adds no value. > + crps_init_debugfs(psu); > + > + return 0; > +} > + > +static const struct of_device_id crps_of_match[] = { > + { > + .compatible = "intel,crps185", > + .data = (void *)crps185 > + }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, crps_of_match); > + > +static struct i2c_driver crps_driver = { > + .driver = { > + .name = "crps", > + .of_match_table = crps_of_match, > + }, > + .probe = crps_probe, > + .id_table = crps_id, > +}; > + > +module_i2c_driver(crps_driver); > + > +MODULE_AUTHOR("Ninad Palsule"); > +MODULE_DESCRIPTION("PMBus driver for Common Redundant power supplies"); Again, this is for _Intel_ power supplies. > +MODULE_LICENSE("GPL"); > +MODULE_IMPORT_NS("PMBUS");
Hi Guenter, Thanks for the review! On 12/12/24 19:29, Guenter Roeck wrote: > On 12/12/24 13:49, Ninad Palsule wrote: >> Add the driver to monitor Intel common redundant power supply (crps185) >> with hwmon over pmbus. >> >> Signed-off-by: Ninad Palsule <ninad@linux.ibm.com> >> --- >> Documentation/hwmon/crps.rst | 95 +++++++++++ > > Documentation/hwmon/index.rst needs to be updated. Added the entry. Sorry for that. > >> MAINTAINERS | 7 + >> drivers/hwmon/pmbus/Kconfig | 9 ++ >> drivers/hwmon/pmbus/Makefile | 1 + >> drivers/hwmon/pmbus/crps.c | 299 +++++++++++++++++++++++++++++++++++ >> 5 files changed, 411 insertions(+) >> create mode 100644 Documentation/hwmon/crps.rst >> create mode 100644 drivers/hwmon/pmbus/crps.c >> >> diff --git a/Documentation/hwmon/crps.rst b/Documentation/hwmon/crps.rst >> new file mode 100644 >> index 000000000000..81d5dfd68a46 >> --- /dev/null >> +++ b/Documentation/hwmon/crps.rst >> @@ -0,0 +1,95 @@ >> +.. SPDX-License-Identifier: GPL-2.0-or-later >> + >> +Kernel driver crps >> +======================== > > I am quite sure that this triggers a documentation warning. Fixed it. > >> + >> +Supported chips: >> + >> + * Intel CRPS185 >> + >> + Prefix: 'crps185' >> + >> + Addresses scanned: - >> + >> +Authors: >> + Ninad Palsule <ninad@linux.ibm.com> >> + >> + > > Is the documentation available somewhere ? > If yes, please add a reference. If not, add a comment explaining that > it is not available to the public. There is no public spec, added the comment > >> +Description >> +----------- >> + >> +This driver implements support for Common Redundant Power supply >> with PMBus > > For _Intel_ ... Updated. > >> +support. >> + >> +The driver is a client driver to the core PMBus driver. >> +Please see Documentation/hwmon/pmbus.rst for details on PMBus client >> drivers. >> + >> + >> +Usage Notes >> +----------- >> + >> +This driver does not auto-detect devices. You will have to >> instantiate the >> +devices explicitly. Please see >> Documentation/i2c/instantiating-devices.rst for >> +details. >> + >> + >> +Sysfs entries >> +------------- >> + >> +======================= >> ====================================================== >> +curr1_label "iin" >> +curr1_input Measured input current >> +curr1_max Maximum input current >> +curr1_max_alarm Input maximum current high alarm >> +curr1_crit Critial high input current >> +curr1_crit_alarm Input critical current high alarm >> +curr1_rated_max Maximum rated input current >> + >> +curr2_label "iout1" >> +curr2_input Measured output current >> +curr2_max Maximum output current >> +curr2_max_alarm Output maximum current high alarm >> +curr2_crit Critial high output current >> +curr2_crit_alarm Output critical current high alarm >> +curr2_rated_max Maximum rated output current >> + >> +in1_label "vin" >> +in1_input Measured input voltage >> +in1_crit Critical input over voltage >> +in1_crit_alarm Critical input over voltage alarm >> +in1_max Maximum input over voltage >> +in1_max_alarm Maximum input over voltage alarm >> +in1_rated_min Minimum rated input voltage >> +in1_rated_max Maximum rated input voltage >> + >> +in2_label "vout1" >> +in2_input Measured input voltage >> +in2_crit Critical input over voltage >> +in2_crit_alarm Critical input over voltage alarm >> +in2_lcrit Critical input under voltage fault >> +in2_lcrit_alarm Critical input under voltage fault alarm >> +in2_max Maximum input over voltage >> +in2_max_alarm Maximum input over voltage alarm >> +in2_min Minimum input under voltage warning >> +in2_min_alarm Minimum input under voltage warning alarm >> +in2_rated_min Minimum rated input voltage >> +in2_rated_max Maximum rated input voltage >> + >> +power1_label "pin" >> +power1_input Measured input power >> +power1_alarm Input power high alarm >> +power1_max Maximum input power >> +power1_rated_max Maximum rated input power >> + >> +temp[1-2]_input Measured temperature >> +temp[1-2]_crit Critical temperature >> +temp[1-2]_crit_alarm Critical temperature alarm >> +temp[1-2]_max Maximum temperature >> +temp[1-2]_max_alarm Maximum temperature alarm >> +temp[1-2]_rated_max Maximum rated temperature >> + >> +fan1_alarm Fan 1 warning. >> +fan1_fault Fan 1 fault. >> +fan1_input Fan 1 speed in RPM. >> +fan1_target Fan 1 target. >> +======================= >> ====================================================== >> diff --git a/MAINTAINERS b/MAINTAINERS >> index 637ddd44245f..6b31d545f0f1 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -6100,6 +6100,13 @@ L: linux-input@vger.kernel.org >> S: Maintained >> F: drivers/hid/hid-creative-sb0540.c >> +CRPS COMMON REDUNDANT PSU DRIVER > > This is _INTEL_ CRPS. Updated. > >> +M: Ninad Palsule <ninad@linux.ibm.com> >> +L: linux-hwmon@vger.kernel.org >> +S: Maintained >> +F: Documentation/hwmon/crps.rst >> +F: drivers/hwmon/pmbus/crps.c >> + >> CRYPTO API >> M: Herbert Xu <herbert@gondor.apana.org.au> >> M: "David S. Miller" <davem@davemloft.net> >> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig >> index 22418a05ced0..56c4eb4b846e 100644 >> --- a/drivers/hwmon/pmbus/Kconfig >> +++ b/drivers/hwmon/pmbus/Kconfig >> @@ -85,6 +85,15 @@ config SENSORS_BPA_RS600 >> This driver can also be built as a module. If so, the module >> will >> be called bpa-rs600. >> +config SENSORS_CRPS >> + tristate "Common Redundant Power Supply" > > Again, this is an Intel product. Fixed. > >> + help >> + If you say yes here you get hardware monitoring support for >> the Common >> + Redundant Power Supply. >> + >> + This driver can also be built as a module. If so, the module will >> + be called crps. >> + >> config SENSORS_DELTA_AHE50DC_FAN >> tristate "Delta AHE-50DC fan control module" >> help >> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile >> index 3d3183f8d2a7..c7eb7739b7f8 100644 >> --- a/drivers/hwmon/pmbus/Makefile >> +++ b/drivers/hwmon/pmbus/Makefile >> @@ -62,3 +62,4 @@ obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o >> obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o >> obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o >> obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o >> +obj-$(CONFIG_SENSORS_CRPS) += crps.o >> diff --git a/drivers/hwmon/pmbus/crps.c b/drivers/hwmon/pmbus/crps.c >> new file mode 100644 >> index 000000000000..44d309f81803 >> --- /dev/null >> +++ b/drivers/hwmon/pmbus/crps.c >> @@ -0,0 +1,299 @@ >> +// SPDX-License-Identifier: GPL-2.0-or-later >> +/* >> + * Copyright 2024 IBM Corp. >> + */ >> + >> +#include <linux/debugfs.h> >> +#include <linux/i2c.h> >> +#include <linux/of.h> >> +#include <linux/pmbus.h> >> + >> +#include "pmbus.h" >> + >> +/* Intel crps185 specific commands. */ >> +#define CRPS185_MFR_IOUT_MAX 0xA6 >> +#define CRPS185_MFR_POUT_MAX 0xA7 >> + > > I fail to see the point in those defines, even more so since > PMBUS_MFR_POUT_MAX and PMBUS_MFR_IOUT_MAX are used below. Removed these defines. > >> +enum { >> + CRPS_DEBUGFS_PMBUS_REVISION = 0, >> + CRPS_DEBUGFS_MAX_POWER_OUT, >> + CRPS_DEBUGFS_MAX_CURRENT_OUT, >> + CRPS_DEBUGFS_NUM_ENTRIES >> +}; >> + >> +enum models { crps185 = 1, crps_unknown }; > > Pointless enum. The driver only supports a single power supply. Removed the enum. > >> + >> +struct crps { >> + enum models version; >> + struct i2c_client *client; >> + >> + int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES]; >> +}; >> + >> +#define to_psu(x, y) container_of((x), struct crps, >> debugfs_entries[(y)]) >> + >> +static struct pmbus_platform_data crps_pdata = { >> + .flags = PMBUS_SKIP_STATUS_CHECK, >> +}; > > Did you confirm that it is needed ? If so, explain why it is needed. I removed it and still driver is working. I added it because spec did not mention about PMBUS_STATUS_CML > >> + >> +static const struct i2c_device_id crps_id[] = { >> + { "intel_crps185", crps185 }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(i2c, crps_id); >> + >> +/* >> + * Convert linear format word to machine format. 11 LSB side bits >> are two's >> + * complement integer mantissa and 5 MSB side bits are two's complement >> + * exponent >> + */ >> +static int crps_convert_linear(int rc) >> +{ >> + s16 exponent; >> + s32 mantissa; >> + s64 val; >> + >> + exponent = ((s16)rc) >> 11; >> + mantissa = ((s16)((rc & 0x7ff) << 5)) >> 5; >> + >> + val = mantissa; >> + if (exponent >= 0) >> + val <<= exponent; >> + else >> + val >>= -exponent; >> + >> + return (int)val; >> +} >> + >> +static ssize_t crps_debugfs_read(struct file *file, char __user *buf, >> + size_t count, loff_t *ppos) >> +{ >> + int rc; >> + int *idxp = file->private_data; >> + int idx = *idxp; >> + struct crps *psu = to_psu(idxp, idx); >> + char data[2 * I2C_SMBUS_BLOCK_MAX] = { 0 }; >> + >> + rc = pmbus_lock_interruptible(psu->client); >> + if (rc) >> + return rc; >> + >> + rc = pmbus_set_page(psu->client, 0, 0xff); >> + if (rc) >> + goto unlock; >> + >> + switch (idx) { >> + case CRPS_DEBUGFS_PMBUS_REVISION: >> + rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION); >> + if (rc >= 0) { >> + if (psu->version == crps185) { >> + if (rc == 0) >> + rc = sprintf(data, "%s", "1.0"); >> + else if (rc == 0x11) >> + rc = sprintf(data, "%s", "1.1"); >> + else if (rc == 0x22) >> + rc = sprintf(data, "%s", "1.2"); >> + else >> + rc = snprintf(data, 3, "0x%02x", rc); >> + } else { >> + rc = snprintf(data, 3, "%02x", rc); >> + } >> + } > > This attribute should be added into the PMBus core. Moved the attribute in the core. > >> + break; >> + case CRPS_DEBUGFS_MAX_POWER_OUT: >> + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX); >> + if (rc >= 0) { >> + rc = crps_convert_linear(rc); >> + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); >> + } >> + break; >> + case CRPS_DEBUGFS_MAX_CURRENT_OUT: >> + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_IOUT_MAX); >> + if (rc >= 0) { >> + rc = crps_convert_linear(rc); >> + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); >> + } >> + break; > > What is the point of those two attributes ? There are already > standard sysfs attributes reporting those values. Removed debugfs > >> + default: >> + rc = -EINVAL; >> + break; >> + } >> + >> +unlock: >> + pmbus_unlock(psu->client); >> + if (rc < 0) >> + return rc; >> + >> + data[rc] = '\n'; >> + rc += 2; >> + >> + return simple_read_from_buffer(buf, count, ppos, data, rc); >> +} >> + >> +static const struct file_operations crps_debugfs_fops = { >> + .llseek = noop_llseek, >> + .read = crps_debugfs_read, >> + .open = simple_open, >> +}; >> + >> +static int crps_read_word_data(struct i2c_client *client, int page, >> + int phase, int reg) >> +{ >> + int rc; >> + >> + switch (reg) { >> + case PMBUS_STATUS_WORD: >> + rc = pmbus_read_word_data(client, page, phase, reg); >> + if (rc < 0) >> + return rc; >> + break; > > Why is this needed ? You are right, removed it. > >> + case PMBUS_OT_WARN_LIMIT: >> + rc = pmbus_read_word_data(client, page, phase, >> + PMBUS_MFR_MAX_TEMP_1); >> + if (rc < 0) >> + return rc; >> + break; >> + case PMBUS_IOUT_OC_WARN_LIMIT: >> + rc = pmbus_read_word_data(client, page, phase, >> + CRPS185_MFR_IOUT_MAX); >> + if (rc < 0) >> + return rc; >> + break; >> + case PMBUS_POUT_OP_WARN_LIMIT: >> + rc = pmbus_read_word_data(client, page, phase, >> + CRPS185_MFR_POUT_MAX); >> + if (rc < 0) >> + return rc; >> + break; > > The above three values are more than odd. They duplicate the respective > standard rated_max attributes as warning limits. Why ? I realized that some of these registers exist. So removed it. > > On top of that, on writes, the actual warning limits are overwritten. > That makes even less sense. I have removed read function so now we don't need write too. > >> + default: >> + rc = -ENODATA; >> + break; >> + } >> + >> + return rc; >> +} >> + >> +static struct pmbus_driver_info crps_info[] = { >> + [crps185] = { >> + .pages = 1, >> + /* PSU uses default linear data format. */ >> + .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | >> + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN | >> + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | >> + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | >> + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | >> + PMBUS_HAVE_STATUS_TEMP | >> + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, >> + .read_word_data = crps_read_word_data, >> + }, >> +}; >> + >> +#define to_psu(x, y) container_of((x), struct crps, >> debugfs_entries[(y)]) >> + >> +static void crps_init_debugfs(struct crps *psu) >> +{ >> + struct i2c_client *client = psu->client; >> + struct dentry *debugfs; >> + int i; >> + >> + /* Don't fail the probe if we can't create debugfs */ >> + debugfs = pmbus_get_debugfs_dir(client); >> + if (!debugfs) >> + return; >> + >> + for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i) >> + psu->debugfs_entries[i] = i; >> + >> + debugfs_create_file("pmbus_revision", 0444, debugfs, >> + &psu->debugfs_entries[CRPS_DEBUGFS_PMBUS_REVISION], >> + &crps_debugfs_fops); >> + debugfs_create_file("max_power_out", 0444, debugfs, >> + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_POWER_OUT], >> + &crps_debugfs_fops); >> + debugfs_create_file("max_current_out", 0444, debugfs, >> + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_CURRENT_OUT], >> + &crps_debugfs_fops); >> +} >> + >> +static int crps_probe(struct i2c_client *client) >> +{ >> + int rc; >> + struct device *dev = &client->dev; >> + enum models vs = crps_unknown; >> + struct crps *psu; >> + const void *md = of_device_get_match_data(&client->dev); >> + const struct i2c_device_id *id = NULL; >> + char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; >> + >> + if (md) { >> + vs = (uintptr_t)md; >> + } else { >> + id = i2c_match_id(crps_id, client); >> + if (id) >> + vs = (enum models)id->driver_data; >> + } >> + > Consider using i2c_get_match_data(). Removed this code. > >> + if (!vs || vs >= crps_unknown) { >> + dev_err(dev, "Version %d not supported\n", vs); >> + return -EINVAL; >> + } > > This is very much pointless. The driver would not be instantiated > withut match. Yes, removed it. > >> + >> + rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); >> + if (rc < 0) { >> + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); >> + return rc; > > dev_err_probe(). Changed to use this function. > >> + } >> + if (strncmp(buf, "03NK260", 7)) { > > This should also check and ensure that rc == 7. Good idea, Added this check. > >> + buf[rc] = '\0'; >> + dev_err(dev, "Model '%s' not supported\n", buf); > > dev_err_probe() Changed the function > >> + return -ENODEV; >> + } >> + >> + client->dev.platform_data = &crps_pdata; >> + rc = pmbus_do_probe(client, &crps_info[vs]); >> + if (rc) { >> + dev_err(dev, "Failed to probe %d\n", rc); >> + return rc; > > dev_err_probe(). Changed this function. > >> + } >> + >> + /* >> + * Don't fail the probe if there isn't enough memory for debugfs. >> + */ >> + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); >> + if (!psu) { >> + dev_warn(dev, "Failed to allocate memory. debugfs are not >> supported.\n"); >> + return 0; >> + } >> + >> + psu->version = vs; >> + psu->client = client; >> + > > Drop all this. Add the PMBus version as standard debugfs attribute to > the PMBus core > if needed/wanted. The rest is already provided as standard sysfs > attributes, and > reporting the same value in debugfs files adds no value. Yes, Removed debugfs. > >> + crps_init_debugfs(psu); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id crps_of_match[] = { >> + { >> + .compatible = "intel,crps185", >> + .data = (void *)crps185 >> + }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, crps_of_match); >> + >> +static struct i2c_driver crps_driver = { >> + .driver = { >> + .name = "crps", >> + .of_match_table = crps_of_match, >> + }, >> + .probe = crps_probe, >> + .id_table = crps_id, >> +}; >> + >> +module_i2c_driver(crps_driver); >> + >> +MODULE_AUTHOR("Ninad Palsule"); >> +MODULE_DESCRIPTION("PMBus driver for Common Redundant power supplies"); > > Again, this is for _Intel_ power supplies. Yes, Added Intel Thanks and Regards, Ninad Palsule > >> +MODULE_LICENSE("GPL"); >> +MODULE_IMPORT_NS("PMBUS"); >
diff --git a/Documentation/hwmon/crps.rst b/Documentation/hwmon/crps.rst new file mode 100644 index 000000000000..81d5dfd68a46 --- /dev/null +++ b/Documentation/hwmon/crps.rst @@ -0,0 +1,95 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver crps +======================== + +Supported chips: + + * Intel CRPS185 + + Prefix: 'crps185' + + Addresses scanned: - + +Authors: + Ninad Palsule <ninad@linux.ibm.com> + + +Description +----------- + +This driver implements support for Common Redundant Power supply with PMBus +support. + +The driver is a client driver to the core PMBus driver. +Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers. + + +Usage Notes +----------- + +This driver does not auto-detect devices. You will have to instantiate the +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for +details. + + +Sysfs entries +------------- + +======================= ====================================================== +curr1_label "iin" +curr1_input Measured input current +curr1_max Maximum input current +curr1_max_alarm Input maximum current high alarm +curr1_crit Critial high input current +curr1_crit_alarm Input critical current high alarm +curr1_rated_max Maximum rated input current + +curr2_label "iout1" +curr2_input Measured output current +curr2_max Maximum output current +curr2_max_alarm Output maximum current high alarm +curr2_crit Critial high output current +curr2_crit_alarm Output critical current high alarm +curr2_rated_max Maximum rated output current + +in1_label "vin" +in1_input Measured input voltage +in1_crit Critical input over voltage +in1_crit_alarm Critical input over voltage alarm +in1_max Maximum input over voltage +in1_max_alarm Maximum input over voltage alarm +in1_rated_min Minimum rated input voltage +in1_rated_max Maximum rated input voltage + +in2_label "vout1" +in2_input Measured input voltage +in2_crit Critical input over voltage +in2_crit_alarm Critical input over voltage alarm +in2_lcrit Critical input under voltage fault +in2_lcrit_alarm Critical input under voltage fault alarm +in2_max Maximum input over voltage +in2_max_alarm Maximum input over voltage alarm +in2_min Minimum input under voltage warning +in2_min_alarm Minimum input under voltage warning alarm +in2_rated_min Minimum rated input voltage +in2_rated_max Maximum rated input voltage + +power1_label "pin" +power1_input Measured input power +power1_alarm Input power high alarm +power1_max Maximum input power +power1_rated_max Maximum rated input power + +temp[1-2]_input Measured temperature +temp[1-2]_crit Critical temperature +temp[1-2]_crit_alarm Critical temperature alarm +temp[1-2]_max Maximum temperature +temp[1-2]_max_alarm Maximum temperature alarm +temp[1-2]_rated_max Maximum rated temperature + +fan1_alarm Fan 1 warning. +fan1_fault Fan 1 fault. +fan1_input Fan 1 speed in RPM. +fan1_target Fan 1 target. +======================= ====================================================== diff --git a/MAINTAINERS b/MAINTAINERS index 637ddd44245f..6b31d545f0f1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6100,6 +6100,13 @@ L: linux-input@vger.kernel.org S: Maintained F: drivers/hid/hid-creative-sb0540.c +CRPS COMMON REDUNDANT PSU DRIVER +M: Ninad Palsule <ninad@linux.ibm.com> +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/crps.rst +F: drivers/hwmon/pmbus/crps.c + CRYPTO API M: Herbert Xu <herbert@gondor.apana.org.au> M: "David S. Miller" <davem@davemloft.net> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 22418a05ced0..56c4eb4b846e 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -85,6 +85,15 @@ config SENSORS_BPA_RS600 This driver can also be built as a module. If so, the module will be called bpa-rs600. +config SENSORS_CRPS + tristate "Common Redundant Power Supply" + help + If you say yes here you get hardware monitoring support for the Common + Redundant Power Supply. + + This driver can also be built as a module. If so, the module will + be called crps. + config SENSORS_DELTA_AHE50DC_FAN tristate "Delta AHE-50DC fan control module" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 3d3183f8d2a7..c7eb7739b7f8 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -62,3 +62,4 @@ obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o +obj-$(CONFIG_SENSORS_CRPS) += crps.o diff --git a/drivers/hwmon/pmbus/crps.c b/drivers/hwmon/pmbus/crps.c new file mode 100644 index 000000000000..44d309f81803 --- /dev/null +++ b/drivers/hwmon/pmbus/crps.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2024 IBM Corp. + */ + +#include <linux/debugfs.h> +#include <linux/i2c.h> +#include <linux/of.h> +#include <linux/pmbus.h> + +#include "pmbus.h" + +/* Intel crps185 specific commands. */ +#define CRPS185_MFR_IOUT_MAX 0xA6 +#define CRPS185_MFR_POUT_MAX 0xA7 + +enum { + CRPS_DEBUGFS_PMBUS_REVISION = 0, + CRPS_DEBUGFS_MAX_POWER_OUT, + CRPS_DEBUGFS_MAX_CURRENT_OUT, + CRPS_DEBUGFS_NUM_ENTRIES +}; + +enum models { crps185 = 1, crps_unknown }; + +struct crps { + enum models version; + struct i2c_client *client; + + int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES]; +}; + +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) + +static struct pmbus_platform_data crps_pdata = { + .flags = PMBUS_SKIP_STATUS_CHECK, +}; + +static const struct i2c_device_id crps_id[] = { + { "intel_crps185", crps185 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, crps_id); + +/* + * Convert linear format word to machine format. 11 LSB side bits are two's + * complement integer mantissa and 5 MSB side bits are two's complement + * exponent + */ +static int crps_convert_linear(int rc) +{ + s16 exponent; + s32 mantissa; + s64 val; + + exponent = ((s16)rc) >> 11; + mantissa = ((s16)((rc & 0x7ff) << 5)) >> 5; + + val = mantissa; + if (exponent >= 0) + val <<= exponent; + else + val >>= -exponent; + + return (int)val; +} + +static ssize_t crps_debugfs_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int rc; + int *idxp = file->private_data; + int idx = *idxp; + struct crps *psu = to_psu(idxp, idx); + char data[2 * I2C_SMBUS_BLOCK_MAX] = { 0 }; + + rc = pmbus_lock_interruptible(psu->client); + if (rc) + return rc; + + rc = pmbus_set_page(psu->client, 0, 0xff); + if (rc) + goto unlock; + + switch (idx) { + case CRPS_DEBUGFS_PMBUS_REVISION: + rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION); + if (rc >= 0) { + if (psu->version == crps185) { + if (rc == 0) + rc = sprintf(data, "%s", "1.0"); + else if (rc == 0x11) + rc = sprintf(data, "%s", "1.1"); + else if (rc == 0x22) + rc = sprintf(data, "%s", "1.2"); + else + rc = snprintf(data, 3, "0x%02x", rc); + } else { + rc = snprintf(data, 3, "%02x", rc); + } + } + break; + case CRPS_DEBUGFS_MAX_POWER_OUT: + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX); + if (rc >= 0) { + rc = crps_convert_linear(rc); + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); + } + break; + case CRPS_DEBUGFS_MAX_CURRENT_OUT: + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_IOUT_MAX); + if (rc >= 0) { + rc = crps_convert_linear(rc); + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); + } + break; + default: + rc = -EINVAL; + break; + } + +unlock: + pmbus_unlock(psu->client); + if (rc < 0) + return rc; + + data[rc] = '\n'; + rc += 2; + + return simple_read_from_buffer(buf, count, ppos, data, rc); +} + +static const struct file_operations crps_debugfs_fops = { + .llseek = noop_llseek, + .read = crps_debugfs_read, + .open = simple_open, +}; + +static int crps_read_word_data(struct i2c_client *client, int page, + int phase, int reg) +{ + int rc; + + switch (reg) { + case PMBUS_STATUS_WORD: + rc = pmbus_read_word_data(client, page, phase, reg); + if (rc < 0) + return rc; + break; + case PMBUS_OT_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + PMBUS_MFR_MAX_TEMP_1); + if (rc < 0) + return rc; + break; + case PMBUS_IOUT_OC_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + CRPS185_MFR_IOUT_MAX); + if (rc < 0) + return rc; + break; + case PMBUS_POUT_OP_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + CRPS185_MFR_POUT_MAX); + if (rc < 0) + return rc; + break; + default: + rc = -ENODATA; + break; + } + + return rc; +} + +static struct pmbus_driver_info crps_info[] = { + [crps185] = { + .pages = 1, + /* PSU uses default linear data format. */ + .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN | + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | + PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, + .read_word_data = crps_read_word_data, + }, +}; + +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) + +static void crps_init_debugfs(struct crps *psu) +{ + struct i2c_client *client = psu->client; + struct dentry *debugfs; + int i; + + /* Don't fail the probe if we can't create debugfs */ + debugfs = pmbus_get_debugfs_dir(client); + if (!debugfs) + return; + + for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i) + psu->debugfs_entries[i] = i; + + debugfs_create_file("pmbus_revision", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_PMBUS_REVISION], + &crps_debugfs_fops); + debugfs_create_file("max_power_out", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_POWER_OUT], + &crps_debugfs_fops); + debugfs_create_file("max_current_out", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_CURRENT_OUT], + &crps_debugfs_fops); +} + +static int crps_probe(struct i2c_client *client) +{ + int rc; + struct device *dev = &client->dev; + enum models vs = crps_unknown; + struct crps *psu; + const void *md = of_device_get_match_data(&client->dev); + const struct i2c_device_id *id = NULL; + char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; + + if (md) { + vs = (uintptr_t)md; + } else { + id = i2c_match_id(crps_id, client); + if (id) + vs = (enum models)id->driver_data; + } + + if (!vs || vs >= crps_unknown) { + dev_err(dev, "Version %d not supported\n", vs); + return -EINVAL; + } + + rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); + if (rc < 0) { + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); + return rc; + } + if (strncmp(buf, "03NK260", 7)) { + buf[rc] = '\0'; + dev_err(dev, "Model '%s' not supported\n", buf); + return -ENODEV; + } + + client->dev.platform_data = &crps_pdata; + rc = pmbus_do_probe(client, &crps_info[vs]); + if (rc) { + dev_err(dev, "Failed to probe %d\n", rc); + return rc; + } + + /* + * Don't fail the probe if there isn't enough memory for debugfs. + */ + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); + if (!psu) { + dev_warn(dev, "Failed to allocate memory. debugfs are not supported.\n"); + return 0; + } + + psu->version = vs; + psu->client = client; + + crps_init_debugfs(psu); + + return 0; +} + +static const struct of_device_id crps_of_match[] = { + { + .compatible = "intel,crps185", + .data = (void *)crps185 + }, + {} +}; +MODULE_DEVICE_TABLE(of, crps_of_match); + +static struct i2c_driver crps_driver = { + .driver = { + .name = "crps", + .of_match_table = crps_of_match, + }, + .probe = crps_probe, + .id_table = crps_id, +}; + +module_i2c_driver(crps_driver); + +MODULE_AUTHOR("Ninad Palsule"); +MODULE_DESCRIPTION("PMBus driver for Common Redundant power supplies"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("PMBUS");
Add the driver to monitor Intel common redundant power supply (crps185) with hwmon over pmbus. Signed-off-by: Ninad Palsule <ninad@linux.ibm.com> --- Documentation/hwmon/crps.rst | 95 +++++++++++ MAINTAINERS | 7 + drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/crps.c | 299 +++++++++++++++++++++++++++++++++++ 5 files changed, 411 insertions(+) create mode 100644 Documentation/hwmon/crps.rst create mode 100644 drivers/hwmon/pmbus/crps.c