[PATCH] i2c-gpio: add board_info to pdata

[PATCH] i2c-gpio: add board_info to pdata

[Ben Dooks]

Add board_info so that the i2c-gpio driver can probe devices on probe
so that i2c_register_board_info() does not need to be used. This is
preferable for devices that get hotplugged as otherwise we need to do
i2c_unregister_board_info() which would be more code.

Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
---
 drivers/i2c/busses/i2c-gpio.c | 8 ++++++++
 include/linux/i2c-gpio.h      | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index 34cfc0e..d1050bd 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -232,6 +232,14 @@ static int i2c_gpio_probe(struct platform_device *pdev)
 		 pdata->scl_is_output_only
 		 ? ", no clock stretching" : "");
 
+	if (pdata->board_info) {
+		struct i2c_board_info const *info = pdata->board_info;
+		int nr;
+
+		for (nr = 0; nr <  pdata->board_size; info++, nr++)
+			i2c_new_device(adap, info);
+	}
+
 	return 0;
 }
 
diff --git a/include/linux/i2c-gpio.h b/include/linux/i2c-gpio.h
index c1bcb1f..b4d2505 100644
--- a/include/linux/i2c-gpio.h
+++ b/include/linux/i2c-gpio.h
@@ -17,6 +17,8 @@
  * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
  * @timeout: clock stretching timeout in jiffies. If the slave keeps
  *	SCL low for longer than this, the transfer will time out.
+ * @board_size: The number of entries in the board_info field.
+ * @board_info: List of devices to be added by this i2c bus at probe time.
  * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
  *	isn't actively driven high when setting the output value high.
  *	gpio_get_value() must return the actual pin state even if the
@@ -30,6 +32,8 @@ struct i2c_gpio_platform_data {
 	unsigned int	scl_pin;
 	int		udelay;
 	int		timeout;
+	int		board_size;
+	struct i2c_board_info *board_info;
 	unsigned int	sda_is_open_drain:1;
 	unsigned int	scl_is_open_drain:1;
 	unsigned int	scl_is_output_only:1;
-- 
2.1.4

Re: [PATCH] i2c-gpio: add board_info to pdata

[Wolfram Sang]

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On Tue, Mar 17, 2015 at 12:14:55PM +0000, Ben Dooks wrote:
> Add board_info so that the i2c-gpio driver can probe devices on probe
> so that i2c_register_board_info() does not need to be used. This is
> preferable for devices that get hotplugged as otherwise we need to do
> i2c_unregister_board_info() which would be more code.
> 
> Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>

Why can't you use static bus numbers? Or instantiating from userspace?


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Re: [PATCH] i2c-gpio: add board_info to pdata

[Ben Dooks]

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Hash: SHA256

On 27/03/15 17:48, Wolfram Sang wrote:
> On Tue, Mar 17, 2015 at 12:14:55PM +0000, Ben Dooks wrote:
>> Add board_info so that the i2c-gpio driver can probe devices on
>> probe so that i2c_register_board_info() does not need to be used.
>> This is preferable for devices that get hotplugged as otherwise
>> we need to do i2c_unregister_board_info() which would be more
>> code.
>> 
>> Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
> 
> Why can't you use static bus numbers? Or instantiating from
> userspace?

the static bus numbers where a pain on a system with dynamically
added i2c busses such as the i2c-mux instatiations.


- -- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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