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Commit 03067410 authored by Sylwester Nawrocki's avatar Sylwester Nawrocki Committed by Mark Brown
Browse files

ASoC: L3 bus: Add default gpio ops 



This adds aptional GPIO bit-bang based callback implementations
for setting CLK, DATA and MODE L3 bus lines.  It is added here
to avoid possible duplicate implementations across users of
the bus.

Signed-off-by: default avatarSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 9b08f30c

include/sound/l3.h

+12 −3
Original line number Diff line number Diff line
@@ -2,9 +2,15 @@ 
#define _L3_H_ 1



struct l3_pins {

	void (*setdat)(int);

	void (*setclk)(int);

	void (*setmode)(int);

	void (*setdat)(struct l3_pins *, int);

	void (*setclk)(struct l3_pins *, int);

	void (*setmode)(struct l3_pins *, int);



	int gpio_data;

	int gpio_clk;

	int gpio_mode;

	int use_gpios;



	int data_hold;

	int data_setup;

	int clock_high;
@@ -13,6 +19,9 @@ struct l3_pins { 
	int mode_setup;

};



struct device;



int l3_write(struct l3_pins *adap, u8 addr, u8 *data, int len);

int l3_set_gpio_ops(struct device *dev, struct l3_pins *adap);



#endif

sound/soc/codecs/l3.c

+59 −12
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/gpio.h>



#include <sound/l3.h>
@@ -32,11 +34,11 @@ static void sendbyte(struct l3_pins *adap, unsigned int byte) 
	int i;



	for (i = 0; i < 8; i++) {

		adap->setclk(0);

		adap->setclk(adap, 0);

		udelay(adap->data_hold);

		adap->setdat(byte & 1);

		adap->setdat(adap, byte & 1);

		udelay(adap->data_setup);

		adap->setclk(1);

		adap->setclk(adap, 1);

		udelay(adap->clock_high);

		byte >>= 1;

	}
@@ -55,10 +57,10 @@ static void sendbytes(struct l3_pins *adap, const u8 *buf, 
	for (i = 0; i < len; i++) {

		if (i) {

			udelay(adap->mode_hold);

			adap->setmode(0);

			adap->setmode(adap, 0);

			udelay(adap->mode);

		}

		adap->setmode(1);

		adap->setmode(adap, 1);

		udelay(adap->mode_setup);

		sendbyte(adap, buf[i]);

	}
@@ -66,26 +68,71 @@ static void sendbytes(struct l3_pins *adap, const u8 *buf, 


int l3_write(struct l3_pins *adap, u8 addr, u8 *data, int len)

{

	adap->setclk(1);

	adap->setdat(1);

	adap->setmode(1);

	adap->setclk(adap, 1);

	adap->setdat(adap, 1);

	adap->setmode(adap, 1);

	udelay(adap->mode);



	adap->setmode(0);

	adap->setmode(adap, 0);

	udelay(adap->mode_setup);

	sendbyte(adap, addr);

	udelay(adap->mode_hold);



	sendbytes(adap, data, len);



	adap->setclk(1);

	adap->setdat(1);

	adap->setmode(0);

	adap->setclk(adap, 1);

	adap->setdat(adap, 1);

	adap->setmode(adap, 0);



	return len;

}

EXPORT_SYMBOL_GPL(l3_write);





static void l3_set_clk(struct l3_pins *adap, int val)

{

	gpio_set_value(adap->gpio_clk, val);

}



static void l3_set_data(struct l3_pins *adap, int val)

{

	gpio_set_value(adap->gpio_data, val);

}



static void l3_set_mode(struct l3_pins *adap, int val)

{

	gpio_set_value(adap->gpio_mode, val);

}



int l3_set_gpio_ops(struct device *dev, struct l3_pins *adap)

{

	int ret;



	if (!adap->use_gpios)

		return -EINVAL;



	ret = devm_gpio_request_one(dev, adap->gpio_data,

				GPIOF_OUT_INIT_LOW, "l3_data");

	if (ret < 0)

		return ret;

	adap->setdat = l3_set_data;



	ret = devm_gpio_request_one(dev, adap->gpio_clk,

				GPIOF_OUT_INIT_LOW, "l3_clk");

	if (ret < 0)

		return ret;

	adap->setclk = l3_set_clk;



	ret = devm_gpio_request_one(dev, adap->gpio_mode,

				GPIOF_OUT_INIT_LOW, "l3_mode");

	if (ret < 0)

		return ret;

	adap->setmode = l3_set_mode;



	return 0;

}

EXPORT_SYMBOL_GPL(l3_set_gpio_ops);



MODULE_DESCRIPTION("L3 bit-banging driver");

MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>");

MODULE_LICENSE("GPL");