mlxsw: minimal: Add I2C support for Mellanox ASICs

Add I2C access support for Mellanox ASICs:
- Virtual Protocol Interconnect switches SwitchX, SwitchX2,
  providing InfiniBand, Ethernet and Fibre Channel connectivity;
- Infiniband switches SwitchIB, SwitchIB2:
- Ethernet switch Spectrum.

Example of probing activation:
echo mlxsw_minimal 0x48 > /sys/bus/i2c/devices/i2c-2/new_device

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/Kconfig b/drivers/net/ethernet/mellanox/mlxsw/Kconfig
index f0bc7b3a99e43c327bc65d61c9c104a20a9b768e..c9822e653b93ed69198245f70ded5182ad8a5fba 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/Kconfig
+++ b/drivers/net/ethernet/mellanox/mlxsw/Kconfig
@@ -79,3 +79,14 @@ config MLXSW_SPECTRUM_DCB
        ---help---
          Say Y here if you want to use Data Center Bridging (DCB) in the
          driver.
+
+config MLXSW_MINIMAL
+       tristate "Mellanox Technologies minimal I2C support"
+       depends on MLXSW_CORE && MLXSW_I2C
+       default m
+       ---help---
+         This driver supports I2C access for Mellanox Technologies Switch
+         ASICs.
+
+         To compile this driver as a module, choose M here: the
+         module will be called mlxsw_minimal.

diff --git a/drivers/net/ethernet/mellanox/mlxsw/Makefile b/drivers/net/ethernet/mellanox/mlxsw/Makefile
index 4623edec963af9842b58bca965717386c33f3288..272294244ab1b850a474e274acb6a3b0519d2afe 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/Makefile
+++ b/drivers/net/ethernet/mellanox/mlxsw/Makefile
@@ -14,3 +14,5 @@ mlxsw_spectrum-objs           := spectrum.o spectrum_buffers.o \
                                   spectrum_switchdev.o spectrum_router.o \
                                   spectrum_kvdl.o
 mlxsw_spectrum-$(CONFIG_MLXSW_SPECTRUM_DCB)    += spectrum_dcb.o
+obj-$(CONFIG_MLXSW_MINIMAL)    += mlxsw_minimal.o
+mlxsw_minimal-objs             := minimal.o

diff --git a/drivers/net/ethernet/mellanox/mlxsw/minimal.c b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
new file mode 100644 (file)
index 0000000..3dd1626
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
@@ -0,0 +1,97 @@
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/minimal.c
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/types.h>
+
+#include "core.h"
+#include "i2c.h"
+
+static const char mlxsw_minimal_driver_name[] = "mlxsw_minimal";
+
+static const struct mlxsw_config_profile mlxsw_minimal_config_profile;
+
+static struct mlxsw_driver mlxsw_minimal_driver = {
+       .kind           = mlxsw_minimal_driver_name,
+       .priv_size      = 1,
+       .profile        = &mlxsw_minimal_config_profile,
+};
+
+static const struct i2c_device_id mlxsw_minimal_i2c_id[] = {
+       { "mlxsw_minimal", 0},
+       { },
+};
+
+static struct i2c_driver mlxsw_minimal_i2c_driver = {
+       .driver.name = "mlxsw_minimal",
+       .class = I2C_CLASS_HWMON,
+       .id_table = mlxsw_minimal_i2c_id,
+};
+
+static int __init mlxsw_minimal_module_init(void)
+{
+       int err;
+
+       err = mlxsw_core_driver_register(&mlxsw_minimal_driver);
+       if (err)
+               return err;
+
+       err = mlxsw_i2c_driver_register(&mlxsw_minimal_i2c_driver);
+       if (err)
+               goto err_i2c_driver_register;
+
+       return 0;
+
+err_i2c_driver_register:
+       mlxsw_core_driver_unregister(&mlxsw_minimal_driver);
+
+       return err;
+}
+
+static void __exit mlxsw_minimal_module_exit(void)
+{
+       mlxsw_i2c_driver_unregister(&mlxsw_minimal_i2c_driver);
+       mlxsw_core_driver_unregister(&mlxsw_minimal_driver);
+}
+
+module_init(mlxsw_minimal_module_init);
+module_exit(mlxsw_minimal_module_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
+MODULE_DESCRIPTION("Mellanox minimal driver");
+MODULE_DEVICE_TABLE(i2c, mlxsw_minimal_i2c_id);