Re: [PATCH v10 8/8] power: bq27xxx_battery_i2c: Add I2C bulk read/write functions

[Sebastian Reichel <sre@kernel.org>]

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Hi,

On Wed, Mar 15, 2017 at 12:26:53PM -0700, Liam Breck wrote:
> From: Matt Ranostay <matt@ranostay.consulting>
> 
> write(), read_bulk(), write_bulk() are required by bq27xxx_battery
> power_supply_battery_info code.
> 
> Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
> Signed-off-by: Liam Breck <kernel@networkimprov.net>

This is required by the previous patch, so your order is not bisect
safe. Please just merge it with Patch 5.

-- Sebastian

>  drivers/power/supply/bq27xxx_battery_i2c.c | 82 +++++++++++++++++++++++++++++-
>  1 file changed, 81 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/bq27xxx_battery_i2c.c b/drivers/power/supply/bq27xxx_battery_i2c.c
> index 13def59..abdc266 100644
> --- a/drivers/power/supply/bq27xxx_battery_i2c.c
> +++ b/drivers/power/supply/bq27xxx_battery_i2c.c
> @@ -38,7 +38,7 @@ static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
>  {
>  	struct i2c_client *client = to_i2c_client(di->dev);
>  	struct i2c_msg msg[2];
> -	unsigned char data[2];
> +	u8 data[2];
>  	int ret;
>  
>  	if (!client->adapter)
> @@ -68,6 +68,82 @@ 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;
> +	u8 data[4];
> +	int ret;
> +
> +	if (!client->adapter)
> +		return -ENODEV;
> +
> +	data[0] = reg;
> +	if (single) {
> +		data[1] = (u8) value;
> +		msg.len = 2;
> +	} else {
> +		put_unaligned_le16(value, &data[1]);
> +		msg.len = 3;
> +	}
> +
> +	msg.buf = data;
> +	msg.addr = client->addr;
> +	msg.flags = 0;
> +
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0)
> +		return ret;
> +	if (ret != 1)
> +		return -EINVAL;
> +	return 0;
> +}
> +
> +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);
> +	int ret;
> +
> +	if (!client->adapter)
> +		return -ENODEV;
> +
> +	ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
> +	if (ret < 0)
> +		return ret;
> +	if (ret != len)
> +		return -EINVAL;
> +	return 0;
> +}
> +
> +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];
> +	int ret;
> +
> +	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;
> +
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0)
> +		return ret;
> +	if (ret != 1)
> +		return -EINVAL;
> +	return 0;
> +}
> +
>  static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
>  				     const struct i2c_device_id *id)
>  {
> @@ -95,7 +171,11 @@ 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)
> -- 
> 2.9.3
> 

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