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DIR:OUT; SFP:1101; X-OriginatorOrg: wiwynn.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jul 2023 10:05:24.0925 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a2ab3769-bfc8-43ff-6b0e-08db8c2d7f7b X-MS-Exchange-CrossTenant-Id: da6e0628-fc83-4caf-9dd2-73061cbab167 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=da6e0628-fc83-4caf-9dd2-73061cbab167; Ip=[211.20.1.79]; Helo=[localhost.localdomain] X-MS-Exchange-CrossTenant-AuthSource: HK3PEPF0000021F.apcprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: JH0PR04MB7022 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add a driver to support ltc4286 chip Signed-off-by: Delphine CC Chiu --- drivers/hwmon/pmbus/Kconfig | 9 +++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/ltc4286.c | 147 ++++++++++++++++++++++++++++++++++ 3 files changed, 157 insertions(+) create mode 100644 drivers/hwmon/pmbus/ltc4286.c diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 270b6336b76d..7cb9cbff587d 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -226,6 +226,15 @@ config SENSORS_LTC3815 This driver can also be built as a module. If so, the module will be called ltc3815. +config SENSORS_LTC4286 + bool "Analog Devices LTC4286" + help + LTC4286 is an integrated solution for hot swap applications that + allows a board to be safely inserted and removed from a + live backplane. + This chip could be used to monitor voltage, current, ...etc. + If you say yes here you get hardware monitoring support for Analog + Devices LTC4286. config SENSORS_MAX15301 tristate "Maxim MAX15301" diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 84ee960a6c2d..94e28f6d6a61 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_LM25066) += lm25066.o obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o +obj-$(CONFIG_SENSORS_LTC4286) += ltc4286.o obj-$(CONFIG_SENSORS_MAX15301) += max15301.o obj-$(CONFIG_SENSORS_MAX16064) += max16064.o obj-$(CONFIG_SENSORS_MAX16601) += max16601.o diff --git a/drivers/hwmon/pmbus/ltc4286.c b/drivers/hwmon/pmbus/ltc4286.c new file mode 100644 index 000000000000..b86bf31cfbae --- /dev/null +++ b/drivers/hwmon/pmbus/ltc4286.c @@ -0,0 +1,147 @@ +#include +#include +#include +#include +#include +#include +#include "pmbus.h" + +/* LTC4286 register */ +#define LTC4286_MFR_CONFIG1 0xF2 + +/* LTC4286 configuration */ +#define VRANGE_SELECT_BIT BIT(1) + +#define LTC4286_MFR_ID_SIZE 3 + +enum chips { ltc4286, ltc4287 }; + +/* + * Initialize the MBR as default settings which is referred to LTC4286 datasheet + * (March 22, 2022 version) table 3 page 16 + */ +static struct pmbus_driver_info ltc4286_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = direct, + .format[PSC_VOLTAGE_OUT] = direct, + .format[PSC_CURRENT_OUT] = direct, + .format[PSC_POWER] = direct, + .format[PSC_TEMPERATURE] = direct, + .m[PSC_VOLTAGE_IN] = 32, + .b[PSC_VOLTAGE_IN] = 0, + .R[PSC_VOLTAGE_IN] = 1, + .m[PSC_VOLTAGE_OUT] = 32, + .b[PSC_VOLTAGE_OUT] = 0, + .R[PSC_VOLTAGE_OUT] = 1, + .m[PSC_CURRENT_OUT] = 1024, + .b[PSC_CURRENT_OUT] = 0, + .R[PSC_CURRENT_OUT] = 3 - 6, /* To support small shunt resistor value */ + .m[PSC_POWER] = 1, + .b[PSC_POWER] = 0, + .R[PSC_POWER] = 4 - 6, /* To support small shunt resistor value */ + .m[PSC_TEMPERATURE] = 1, + .b[PSC_TEMPERATURE] = 273, + .R[PSC_TEMPERATURE] = 0, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | + PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP, +}; + +static const struct i2c_device_id ltc4286_id[] = { { "ltc4286", ltc4286 }, + { "ltc4287", ltc4287 }, + {} }; +MODULE_DEVICE_TABLE(i2c, ltc4286_id); + +static int ltc4286_probe(struct i2c_client *client) +{ + int ret; + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + struct pmbus_driver_info *info; + u32 rsense; + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer); + if (ret < 0) { + dev_err(&client->dev, "failed to read manufacturer id\n"); + return ret; + } + + /* + * Refer to ltc4286 datasheet page 20 + * the manufacturer id is LTC + */ + if (ret != LTC4286_MFR_ID_SIZE || + strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) { + return dev_err_probe(&client->dev, err, + "failed to read manufacturer id\n"); + } + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer); + if (ret < 0) { + dev_err(&client->dev, "failed to read manufacturer model\n"); + return ret; + } + + for (mid = ltc4286_id; mid->name[0]; mid++) { + if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) + break; + } + + ret = of_property_read_u32(client->dev.of_node, + "shunt-resistor-micro-ohms", &rsense); + if (ret < 0) + return ret; + + if (rsense == 0) + return -EINVAL; + + info = <c4286_info; + + /* Default of VRANGE_SELECT = 1, 102.4V */ + if (device_property_read_bool(client->dev, "vrange_select_25p6")) { + /* Setup MFR1 CONFIG register bit 1 VRANGE_SELECT */ + ret = i2c_smbus_read_word_data(client, LTC4286_MFR_CONFIG1); + if (ret < 0) { + dev_err(&client->dev, + "failed to read manufacturer configuration one\n"); + return ret; + } + + ret &= ~VRANGE_SELECT; /* VRANGE_SELECT = 0, 25.6V */ + ret = i2c_smbus_write_word_data(client, LTC4286_MFR_CONFIG1, + ret); + if (ret < 0) { + dev_err(&client->dev, "failed to set vrange\n"); + return ret; + } + + info->m[PSC_VOLTAGE_IN] = 128; + info->m[PSC_VOLTAGE_OUT] = 128; + info->m[PSC_POWER] = 4 * rsense; + } else + info->m[PSC_POWER] = rsense; + + info->m[PSC_CURRENT_OUT] = 1024 * rsense; + + return pmbus_do_probe(client, info); +} + +static const struct of_device_id ltc4286_of_match[] = { + { .compatible = "lltc,ltc4286" }, + { .compatible = "lltc,ltc4287" }, + {} +}; + +static struct i2c_driver ltc4286_driver = { + .driver = { + .name = "ltc4286", + .of_match_table = ltc4286_of_match, + }, + .probe = ltc4286_probe, + .id_table = ltc4286_id, +}; + +module_i2c_driver(ltc4286_driver); + +MODULE_AUTHOR("Delphine CC Chiu "); +MODULE_DESCRIPTION("PMBUS driver for LTC4286 and compatibles"); +MODULE_LICENSE("GPL");