Re: [PATCH v4 6/8] power: bq27xxx_battery: add i2c bulk read/write functions

[Sebastian Reichel <sre@kernel.org>]

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Hi,

On Sat, Jan 21, 2017 at 11:14:02PM -0800, Matt Ranostay wrote:
> Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
> ---
>  drivers/power/supply/bq27xxx_battery_i2c.c | 62 ++++++++++++++++++++++++++++++
>  include/linux/power/bq27xxx_battery.h      |  4 ++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/drivers/power/supply/bq27xxx_battery_i2c.c b/drivers/power/supply/bq27xxx_battery_i2c.c
> index 2ea2d0b06948..feeb04ed88c8 100644
> --- a/drivers/power/supply/bq27xxx_battery_i2c.c
> +++ b/drivers/power/supply/bq27xxx_battery_i2c.c
> @@ -68,6 +68,64 @@ static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
>  	return ret;
>  }
>  
> +static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
> +				     int value, bool single)
> +{
> +	struct i2c_client *client = to_i2c_client(di->dev);
> +	struct i2c_msg msg;
> +	unsigned char data[4];
> +
> +	if (!client->adapter)
> +		return -ENODEV;
> +
> +	data[0] = reg;
> +	if (single) {
> +		data[1] = (unsigned char) value;
> +		msg.len = 2;
> +	} else {
> +		put_unaligned_le16(value, &data[1]);
> +		msg.len = 3;
> +	}
> +
> +	msg.buf = data;
> +	msg.addr = client->addr;
> +	msg.flags = 0;
> +
> +	return i2c_transfer(client->adapter, &msg, 1) == 1 ? 0 : -EINVAL;
> +}
> +
> +static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
> +					 u8 *data, int len)
> +{
> +	struct i2c_client *client = to_i2c_client(di->dev);
> +
> +	if (!client->adapter)
> +		return -ENODEV;
> +
> +	return i2c_smbus_read_i2c_block_data(client, reg, len, data);
> +}
> +
> +static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
> +					  u8 reg, u8 *data, int len)
> +{
> +	struct i2c_client *client = to_i2c_client(di->dev);
> +	struct i2c_msg msg;
> +	u8 buf[33];
> +
> +	if (!client->adapter)
> +		return -ENODEV;
> +
> +	buf[0] = reg;
> +	memcpy(&buf[1], data, len);
> +
> +	msg.buf = buf;
> +	msg.addr = client->addr;
> +	msg.flags = 0;
> +	msg.len = len + 1;
> +
> +	return i2c_transfer(client->adapter, &msg, 1) == 1 ? 0 : -EINVAL;
> +}
> +
>  static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
>  				     const struct i2c_device_id *id)
>  {
> @@ -95,7 +153,11 @@ static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
>  	di->dev = &client->dev;
>  	di->chip = id->driver_data;
>  	di->name = name;
> +
>  	di->bus.read = bq27xxx_battery_i2c_read;
> +	di->bus.write = bq27xxx_battery_i2c_write;
> +	di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
> +	di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
>  
>  	ret = bq27xxx_battery_setup(di);
>  	if (ret)
> diff --git a/include/linux/power/bq27xxx_battery.h b/include/linux/power/bq27xxx_battery.h
> index 3f265dbf11af..581402380d6e 100644
> --- a/include/linux/power/bq27xxx_battery.h
> +++ b/include/linux/power/bq27xxx_battery.h
> @@ -41,6 +41,9 @@ struct bq27xxx_platform_data {
>  struct bq27xxx_device_info;
>  struct bq27xxx_access_methods {
>  	int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
> +	int (*write)(struct bq27xxx_device_info *di, u8 reg, int value, bool single);
> +	int (*read_bulk)(struct bq27xxx_device_info *di, u8 reg, u8 *data, int len);
> +	int (*write_bulk)(struct bq27xxx_device_info *di, u8 reg, u8 *data, int len);

So I had a look at patch 8 and I think we should start with finally
converting bq27xxx to regmap API and probably a second regmap for
the block data stuff. That way you get all the debugging info in
debugfs and the driver looks much cleaner.

>  };
>  
>  struct bq27xxx_reg_cache {
> @@ -71,6 +74,7 @@ struct bq27xxx_device_info {
>  	struct list_head list;
>  	struct mutex lock;
>  	u8 *regs;
> +	u8 buffer[32];

unrelated change.

>  };
>  
>  void bq27xxx_battery_update(struct bq27xxx_device_info *di);

-- Sebastian

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