diff options
author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2016-08-04 15:38:41 +0200 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2016-08-08 12:55:20 +0200 |
commit | 0306741004fdfc2bc515b4b129b1f86881c5fcf5 (patch) | |
tree | b87a6bbe52669766b548d86348388a93859a0ff3 /sound/soc/codecs/l3.c | |
parent | ASoC: samsung: Remove unused now unused struct s3c_dma_params (diff) | |
download | linux-0306741004fdfc2bc515b4b129b1f86881c5fcf5.tar.xz linux-0306741004fdfc2bc515b4b129b1f86881c5fcf5.zip |
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: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/l3.c')
-rw-r--r-- | sound/soc/codecs/l3.c | 71 |
1 files changed, 59 insertions, 12 deletions
diff --git a/sound/soc/codecs/l3.c b/sound/soc/codecs/l3.c index 5353af58862c..a10ea3c716c6 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"); |