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authorSylwester Nawrocki <s.nawrocki@samsung.com>2016-08-04 15:38:41 +0200
committerMark Brown <broonie@kernel.org>2016-08-08 11:55:20 +0100
commit0306741004fdfc2bc515b4b129b1f86881c5fcf5 (patch)
treeb87a6bbe52669766b548d86348388a93859a0ff3 /sound
parent9b08f30c4f91fb9bbafa6a844cd0302e5752b21e (diff)
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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')
-rw-r--r--sound/soc/codecs/l3.c71
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");