The GPIOs are used e.g. on HifiBerry DAC+ HATs to control the LED (GPIO3) and the choice of the 44.1 (GPIO6) or 48 (GPIO3) kHz oscillator (when present).
Enable basic gpio_chip to get/set values and get/set directions. Tested with GPIO_LIB from sys/class/gpio, the LED turns on/off as desired.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/codecs/pcm512x.c | 108 +++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+)
diff --git a/sound/soc/codecs/pcm512x.c b/sound/soc/codecs/pcm512x.c index 4cbef9affffd..4f895a588c31 100644 --- a/sound/soc/codecs/pcm512x.c +++ b/sound/soc/codecs/pcm512x.c @@ -10,6 +10,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/clk.h> +#include <linux/gpio/driver.h> #include <linux/kernel.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> @@ -32,6 +33,7 @@ static const char * const pcm512x_supply_names[PCM512x_NUM_SUPPLIES] = { struct pcm512x_priv { struct regmap *regmap; struct clk *sclk; + struct gpio_chip chip; struct regulator_bulk_data supplies[PCM512x_NUM_SUPPLIES]; struct notifier_block supply_nb[PCM512x_NUM_SUPPLIES]; int fmt; @@ -1503,6 +1505,102 @@ const struct regmap_config pcm512x_regmap = { }; EXPORT_SYMBOL_GPL(pcm512x_regmap);
+static int pcm512x_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + struct pcm512x_priv *pcm512x = gpiochip_get_data(chip); + unsigned int val; + int ret; + + ret = regmap_read(pcm512x->regmap, PCM512x_GPIO_EN, &val); + if (ret < 0) + return ret; + + val = (val >> offset) & 1; + + /* val is 0 for input, 1 for output, return inverted */ + return val ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; +} + +static int pcm512x_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct pcm512x_priv *pcm512x = gpiochip_get_data(chip); + + return regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_EN, + BIT(offset), 0); +} + +static int pcm512x_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, + int value) +{ + struct pcm512x_priv *pcm512x = gpiochip_get_data(chip); + unsigned int reg; + int ret; + + /* select Register GPIOx output for OUTPUT_x (1..6) */ + reg = PCM512x_GPIO_OUTPUT_1 + offset; + ret = regmap_update_bits(pcm512x->regmap, reg, 0x0f, 0x02); + if (ret < 0) + return ret; + + /* enable output x */ + ret = regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_EN, + BIT(offset), BIT(offset)); + if (ret < 0) + return ret; + + /* set value */ + return regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_CONTROL_1, + BIT(offset), value << offset); +} + +static int pcm512x_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct pcm512x_priv *pcm512x = gpiochip_get_data(chip); + unsigned int val; + int ret; + + ret = regmap_read(pcm512x->regmap, PCM512x_GPIO_CONTROL_1, &val); + if (ret < 0) + return ret; + + return (val >> offset) & 1; +} + +static void pcm512x_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct pcm512x_priv *pcm512x = gpiochip_get_data(chip); + int ret; + + ret = regmap_update_bits(pcm512x->regmap, PCM512x_GPIO_CONTROL_1, + BIT(offset), value << offset); + + if (ret < 0) + pr_debug("%s: regmap_update_bits failed: %d\n", __func__, ret); +} + +/* list human-readable names, makes GPIOLIB usage straightforward */ +static const char * const pcm512x_gpio_names[] = { + "PCM512x-GPIO1", "PCM512x-GPIO2", "PCM512x-GPIO3", + "PCM512x-GPIO4", "PCM512x-GPIO5", "PCM512x-GPIO6" +}; + +static const struct gpio_chip template_chip = { + .label = "pcm512x-gpio", + .names = pcm512x_gpio_names, + .owner = THIS_MODULE, + .get_direction = pcm512x_gpio_get_direction, + .direction_input = pcm512x_gpio_direction_input, + .direction_output = pcm512x_gpio_direction_output, + .get = pcm512x_gpio_get, + .set = pcm512x_gpio_set, + .base = -1, /* let gpiolib select the base */ + .ngpio = ARRAY_SIZE(pcm512x_gpio_names), +}; + int pcm512x_probe(struct device *dev, struct regmap *regmap) { struct pcm512x_priv *pcm512x; @@ -1563,6 +1661,16 @@ int pcm512x_probe(struct device *dev, struct regmap *regmap) goto err; }
+ /* expose 6 GPIO pins, numbered from 1 to 6 */ + pcm512x->chip = template_chip; + pcm512x->chip.parent = dev; + + ret = devm_gpiochip_add_data(dev, &pcm512x->chip, pcm512x); + if (ret != 0) { + dev_err(dev, "Failed to register gpio chip: %d\n", ret); + goto err; + } + pcm512x->sclk = devm_clk_get(dev, NULL); if (PTR_ERR(pcm512x->sclk) == -EPROBE_DEFER) { ret = -EPROBE_DEFER;