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 --- include/sound/l3.h | 15 ++++++++--- sound/soc/codecs/l3.c | 71 ++++++++++++++++++++++++++++++++++++++++++--------- 2 files changed, 71 insertions(+), 15 deletions(-)
diff --git a/include/sound/l3.h b/include/sound/l3.h index 423a08f..1471da2 100644 --- a/include/sound/l3.h +++ b/include/sound/l3.h @@ -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 diff --git a/sound/soc/codecs/l3.c b/sound/soc/codecs/l3.c index 5353af5..a10ea3c 100644 --- a/sound/soc/codecs/l3.c +++ b/sound/soc/codecs/l3.c @@ -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");