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ASoC: L3 bus: Add default gpio ops

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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: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sylwester Nawrocki 2016-08-04 15:38:41 +02:00 committed by Mark Brown
parent 9b08f30c4f
commit 0306741004
2 changed files with 71 additions and 15 deletions
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15
include/sound/l3.h
View File

@ -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

71
sound/soc/codecs/l3.c
View File

@ -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");