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From:   Xiaoting Liu <xiaoting.liu@hxt-semitech.com>
To:     <linux@roeck-us.net>, <jdelvare@suse.com>
CC:     <openbmc@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
        <linux-hwmon@vger.kernel.org>, <shunyong.yang@hxt-semitech.com>,
        <dongsheng.wang@hxt-semitech.com>,
        Xiaoting Liu <xiaoting.liu@hxt-semitech.com>
Subject: [PATCH 4/4] pmbus (dps650ab): add power supply driver
Date:   Fri, 4 Jan 2019 17:05:27 +0800
Message-ID: <e0ad8b6bb620f9fc2f818cbda66825c297f73d67.1546591275.git.xiaoting.liu@hxt-semitech.com>
In-Reply-To: <cover.1546591275.git.xiaoting.liu@hxt-semitech.com>
References: <cover.1546591275.git.xiaoting.liu@hxt-semitech.com>
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Sender: linux-kernel-owner@vger.kernel.org
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The Delta dps650ab provides main power and standby power to server.
dps650ab can be detected by MFR_ID and MFR_MODEL referring to
manufacturer's feedback. This patch adds driver to moniter power
supply status.

Signed-off-by: Xiaoting Liu <xiaoting.liu@hxt-semitech.com>
---
 drivers/hwmon/pmbus/Kconfig    |  10 +++++
 drivers/hwmon/pmbus/Makefile   |   1 +
 drivers/hwmon/pmbus/dps650ab.c | 100 +++++++++++++++++++++++++++++++++++++++++
 drivers/hwmon/pmbus/pmbus.c    |   3 ++
 4 files changed, 114 insertions(+)

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 629cb45f8557..de4638396592 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -184,4 +184,14 @@ config SENSORS_ZL6100
          This driver can also be built as a module. If so, the module will
          be called zl6100.

+config SENSORS_DPS650AB
+       tristate "Delta DPS650AB"
+       default n
+       help
+         If you say yes here you get hardware monitoring support for the
+         Delta DPS650AB controller.
+
+         This driver can also be built as a module. If so, the module will
+         be called dps650ab.
+
 endif # PMBUS
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index ea0e39518c21..414818230a26 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_SENSORS_TPS53679)        += tps53679.o
 obj-$(CONFIG_SENSORS_UCD9000)  += ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)  += ucd9200.o
 obj-$(CONFIG_SENSORS_ZL6100)   += zl6100.o
+obj-$(CONFIG_SENSORS_DPS650AB) += dps650ab.o
diff --git a/drivers/hwmon/pmbus/dps650ab.c b/drivers/hwmon/pmbus/dps650ab.c
new file mode 100644
index 000000000000..3c300e621f5a
--- /dev/null
+++ b/drivers/hwmon/pmbus/dps650ab.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware monitoring driver for DELTA DPS650AB
+ *
+ * Copyright (c) 2018 Huaxintong Semiconductor Technology Co., Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define DPS650AB_MFR_ID                        "DELTA"
+#define DPS650AB_MFR_MODEL             "DPS-650AB-16 A"
+
+static int dps650ab_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct pmbus_driver_info *info;
+       u8 buf[I2C_SMBUS_BLOCK_MAX];
+       int ret;
+
+       memset(buf, 0, I2C_SMBUS_BLOCK_MAX);
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_READ_BYTE_DATA
+                               | I2C_FUNC_SMBUS_READ_WORD_DATA
+                               | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+               return -ENODEV;
+
+       ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+       if (ret < 0) {
+               dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
+               return ret;
+       }
+
+       if (strncmp(buf, DPS650AB_MFR_ID, strlen(DPS650AB_MFR_ID))) {
+               dev_err(&client->dev, "DPS650AB_MFR_ID unrecognised\n");
+               return -ENODEV;
+       }
+
+       ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+       if (ret < 0) {
+               dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
+               return ret;
+       }
+
+       if (strncmp(buf, DPS650AB_MFR_MODEL, strlen(DPS650AB_MFR_MODEL))) {
+               dev_err(&client->dev, "DPS650AB_MFR_MODEL unrecognised\n");
+               return -ENODEV;
+       }
+
+       info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       info->pages = 1;
+       info->format[PSC_VOLTAGE_IN] = linear;
+       info->format[PSC_VOLTAGE_OUT] = linear;
+       info->format[PSC_CURRENT_IN] = linear;
+       info->format[PSC_CURRENT_OUT] = linear;
+       info->format[PSC_POWER] = linear;
+       info->format[PSC_TEMPERATURE] = linear;
+
+       info->func[0] = PMBUS_HAVE_VIN
+               | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+               | PMBUS_HAVE_STATUS_INPUT
+               | PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12
+               | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+               | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+               | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+               | PMBUS_HAVE_STATUS_TEMP;
+       info->func[1] = info->func[0];
+
+       return pmbus_do_probe(client, id, info);
+}
+
+static const struct i2c_device_id dps650ab_id[] = {
+       {"dps650ab", 1},
+       {}
+};
+
+MODULE_DEVICE_TABLE(i2c, dps650ab_id);
+
+static struct i2c_driver dps650ab_driver = {
+       .driver = {
+               .name   = "dps650ab",
+       },
+       .probe          = dps650ab_probe,
+       .remove         = pmbus_do_remove,
+       .id_table       = dps650ab_id,
+};
+
+module_i2c_driver(dps650ab_driver);
+
+MODULE_AUTHOR("Liuxiaoting <xiaoting.liu@hxt-semitech.com");
+MODULE_DESCRIPTION("PMBus driver for DPS650AB");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
index aa4cf9636e99..930e8a3e2366 100644
--- a/drivers/hwmon/pmbus/pmbus.c
+++ b/drivers/hwmon/pmbus/pmbus.c
@@ -204,6 +204,8 @@ static int pmbus_probe(struct i2c_client *client,
 static const struct pmbus_device_info sgd009_pmbus_info = {
                                1, PMBUS_SKIP_STATUS_CHECK};
 static const struct pmbus_device_info pmbus_info = {0, 0};
+static const struct pmbus_device_info dps650ab_pmbus_info = {
+                               1, PMBUS_SKIP_STATUS_CHECK};
 /*
  * Use driver_data to set the number of pages supported by the chip.
  */
@@ -227,6 +229,7 @@ static int pmbus_probe(struct i2c_client *client,
        {"tps544c20", (kernel_ulong_t)&default_pmbus_info},
        {"tps544c25", (kernel_ulong_t)&default_pmbus_info},
        {"udt020", (kernel_ulong_t)&default_pmbus_info},
+       {"dps650ab", (kernel_ulong_t)&dps650ab_pmbus_info},
        {}
 };

--
1.8.3.1


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