[RFC PATCH linux v6 4/9] hwmon: occ: Add I2C SCOM transport implementation

[Andrew Jeffery]

On Tue, 2016-11-29 at 17:03 -0600, eajames.ibm at gmail.com wrote:
> > From: "Edward A. James" <eajames at us.ibm.com>
> 
> The BMC queries the OCC on POWER8 chips with SCOMs over I2C.
> 
> > Signed-off-by: Edward A. James <eajames at us.ibm.com>
> ---
>  drivers/hwmon/occ/occ_scom_i2c.c | 68 ++++++++++++++++++++++++++++++++++++++++
>  drivers/hwmon/occ/occ_scom_i2c.h | 20 ++++++++++++
>  2 files changed, 88 insertions(+)
>  create mode 100644 drivers/hwmon/occ/occ_scom_i2c.c
>  create mode 100644 drivers/hwmon/occ/occ_scom_i2c.h
> 
> diff --git a/drivers/hwmon/occ/occ_scom_i2c.c b/drivers/hwmon/occ/occ_scom_i2c.c
> new file mode 100644
> index 0000000..e1bb363
> --- /dev/null
> +++ b/drivers/hwmon/occ/occ_scom_i2c.c
> @@ -0,0 +1,68 @@
> +/*
> + * occ_i2c.c - hwmon OCC driver
> + *
> + * This file contains the i2c layer for accessing the OCC over i2c bus.
> + *
> + * Copyright 2016 IBM Corp.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "scom.h"
> +#include "occ_scom_i2c.h"
> +
> +#define OCC_I2C_NAME   "occ-p8-i2c"
> +
> +int occ_i2c_getscom(void *bus, u32 address, u8 *data, size_t offset)
> +{
> +       ssize_t rc;
> +       u64 buf;
> +       struct i2c_client *client = bus;
> +
> +       rc = i2c_master_send(client, (const char *)&address, sizeof(u32));
> +       if (rc != sizeof(u32))
> +               return -SCOM_WRITE_ERROR;
> +
> +       rc = i2c_master_recv(client, (char *)&buf, sizeof(u64));
> +       if (rc != sizeof(u64))
> +               return -SCOM_READ_ERROR;
> +
> +       *((u64 *)&data[offset]) = be64_to_cpu(buf);

See the comments in 2/9 regarding changing the interface.

> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(occ_i2c_getscom);
> +
> +int occ_i2c_putscom(void *bus, u32 address, u32 data0, u32 data1)
> +{
> +       u32 buf[3];
> +       ssize_t rc;
> +       struct i2c_client *client = bus;
> +
> +       buf[0] = address;
> +       buf[1] = data1;
> +       buf[2] = data0;
> +
> +       rc = i2c_master_send(client, (const char *)buf, sizeof(u32) * 3);
> +       if (rc != sizeof(u32) * 3)
> +               return -SCOM_WRITE_ERROR;
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(occ_i2c_putscom);
> +
> > +MODULE_AUTHOR("Eddie James <eajames at us.ibm.com>");
> +MODULE_DESCRIPTION("I2C OCC SCOM transport");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/hwmon/occ/occ_scom_i2c.h b/drivers/hwmon/occ/occ_scom_i2c.h
> new file mode 100644
> index 0000000..92225f4
> --- /dev/null
> +++ b/drivers/hwmon/occ/occ_scom_i2c.h
> @@ -0,0 +1,20 @@
> +/*
> + * occ_i2c.c - hwmon OCC driver
> + *
> + * This file contains the i2c layer for accessing the OCC over i2c bus.
> + *
> + * Copyright 2016 IBM Corp.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +int occ_i2c_getscom(void *bus, u32 address, u8 *data, size_t offset);
+int occ_i2c_putscom(void *bus, u32 address, u32 data0, u32 data1);
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