1 files changed, 397 insertions, 0 deletions
diff --git a/sound/soc/soc-ac97.c b/sound/soc/soc-ac97.c
new file mode 100644
index 0000000000..4e4fe29ade
--- /dev/null
+++ b/sound/soc/soc-ac97.c
@@ -0,0 +1,397 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// soc-ac97.c  --  ALSA SoC Audio Layer AC97 support
+//
+// Copyright 2005 Wolfson Microelectronics PLC.
+// Copyright 2005 Openedhand Ltd.
+// Copyright (C) 2010 Slimlogic Ltd.
+// Copyright (C) 2010 Texas Instruments Inc.
+//
+// Author: Liam Girdwood <lrg@slimlogic.co.uk>
+//         with code, comments and ideas from :-
+//         Richard Purdie <richard@openedhand.com>
+
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/slab.h>
+#include <sound/ac97_codec.h>
+#include <sound/soc.h>
+
+struct snd_ac97_reset_cfg {
+	struct pinctrl *pctl;
+	struct pinctrl_state *pstate_reset;
+	struct pinctrl_state *pstate_warm_reset;
+	struct pinctrl_state *pstate_run;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *sdata_gpio;
+	struct gpio_desc *sync_gpio;
+};
+
+static struct snd_ac97_bus soc_ac97_bus = {
+	.ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */
+};
+
+static void soc_ac97_device_release(struct device *dev)
+{
+	kfree(to_ac97_t(dev));
+}
+
+#ifdef CONFIG_GPIOLIB
+struct snd_ac97_gpio_priv {
+	struct gpio_chip gpio_chip;
+	unsigned int gpios_set;
+	struct snd_soc_component *component;
+};
+
+static inline struct snd_soc_component *gpio_to_component(struct gpio_chip *chip)
+{
+	struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
+
+	return gpio_priv->component;
+}
+
+static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+	if (offset >= AC97_NUM_GPIOS)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip,
+					  unsigned int offset)
+{
+	struct snd_soc_component *component = gpio_to_component(chip);
+
+	dev_dbg(component->dev, "set gpio %d to output\n", offset);
+	return snd_soc_component_update_bits(component, AC97_GPIO_CFG,
+				   1 << offset, 1 << offset);
+}
+
+static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct snd_soc_component *component = gpio_to_component(chip);
+	int ret;
+
+	ret = snd_soc_component_read(component, AC97_GPIO_STATUS);
+
+	dev_dbg(component->dev, "get gpio %d : %d\n", offset,
+		ret & (1 << offset));
+
+	return !!(ret & (1 << offset));
+}
+
+static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned int offset,
+				  int value)
+{
+	struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
+	struct snd_soc_component *component = gpio_to_component(chip);
+
+	gpio_priv->gpios_set &= ~(1 << offset);
+	gpio_priv->gpios_set |= (!!value) << offset;
+	snd_soc_component_write(component, AC97_GPIO_STATUS,
+				gpio_priv->gpios_set);
+	dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value);
+}
+
+static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip,
+				     unsigned offset, int value)
+{
+	struct snd_soc_component *component = gpio_to_component(chip);
+
+	dev_dbg(component->dev, "set gpio %d to output\n", offset);
+	snd_soc_ac97_gpio_set(chip, offset, value);
+	return snd_soc_component_update_bits(component, AC97_GPIO_CFG,
+					     1 << offset, 0);
+}
+
+static const struct gpio_chip snd_soc_ac97_gpio_chip = {
+	.label			= "snd_soc_ac97",
+	.owner			= THIS_MODULE,
+	.request		= snd_soc_ac97_gpio_request,
+	.direction_input	= snd_soc_ac97_gpio_direction_in,
+	.get			= snd_soc_ac97_gpio_get,
+	.direction_output	= snd_soc_ac97_gpio_direction_out,
+	.set			= snd_soc_ac97_gpio_set,
+	.can_sleep		= 1,
+};
+
+static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
+				  struct snd_soc_component *component)
+{
+	struct snd_ac97_gpio_priv *gpio_priv;
+	int ret;
+
+	gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);
+	if (!gpio_priv)
+		return -ENOMEM;
+	ac97->gpio_priv = gpio_priv;
+	gpio_priv->component = component;
+	gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;
+	gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;
+	gpio_priv->gpio_chip.parent = component->dev;
+	gpio_priv->gpio_chip.base = -1;
+
+	ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
+	if (ret != 0)
+		dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);
+	return ret;
+}
+
+static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
+{
+	gpiochip_remove(&ac97->gpio_priv->gpio_chip);
+}
+#else
+static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
+				  struct snd_soc_component *component)
+{
+	return 0;
+}
+
+static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
+{
+}
+#endif
+
+/**
+ * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
+ * @component: The COMPONENT for which to create the AC'97 device
+ *
+ * Allocated a new snd_ac97 device and intializes it, but does not yet register
+ * it. The caller is responsible to either call device_add(&ac97->dev) to
+ * register the device, or to call put_device(&ac97->dev) to free the device.
+ *
+ * Returns: A snd_ac97 device or a PTR_ERR in case of an error.
+ */
+struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component)
+{
+	struct snd_ac97 *ac97;
+
+	ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
+	if (ac97 == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	ac97->bus = &soc_ac97_bus;
+	ac97->num = 0;
+
+	ac97->dev.bus = &ac97_bus_type;
+	ac97->dev.parent = component->card->dev;
+	ac97->dev.release = soc_ac97_device_release;
+
+	dev_set_name(&ac97->dev, "%d-%d:%s",
+		     component->card->snd_card->number, 0,
+		     component->name);
+
+	device_initialize(&ac97->dev);
+
+	return ac97;
+}
+EXPORT_SYMBOL(snd_soc_alloc_ac97_component);
+
+/**
+ * snd_soc_new_ac97_component - initailise AC97 device
+ * @component: audio component
+ * @id: The expected device ID
+ * @id_mask: Mask that is applied to the device ID before comparing with @id
+ *
+ * Initialises AC97 component resources for use by ad-hoc devices only.
+ *
+ * If @id is not 0 this function will reset the device, then read the ID from
+ * the device and check if it matches the expected ID. If it doesn't match an
+ * error will be returned and device will not be registered.
+ *
+ * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success.
+ */
+struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
+	unsigned int id, unsigned int id_mask)
+{
+	struct snd_ac97 *ac97;
+	int ret;
+
+	ac97 = snd_soc_alloc_ac97_component(component);
+	if (IS_ERR(ac97))
+		return ac97;
+
+	if (id) {
+		ret = snd_ac97_reset(ac97, false, id, id_mask);
+		if (ret < 0) {
+			dev_err(component->dev, "Failed to reset AC97 device: %d\n",
+				ret);
+			goto err_put_device;
+		}
+	}
+
+	ret = device_add(&ac97->dev);
+	if (ret)
+		goto err_put_device;
+
+	ret = snd_soc_ac97_init_gpio(ac97, component);
+	if (ret)
+		goto err_put_device;
+
+	return ac97;
+
+err_put_device:
+	put_device(&ac97->dev);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component);
+
+/**
+ * snd_soc_free_ac97_component - free AC97 component device
+ * @ac97: snd_ac97 device to be freed
+ *
+ * Frees AC97 component device resources.
+ */
+void snd_soc_free_ac97_component(struct snd_ac97 *ac97)
+{
+	snd_soc_ac97_free_gpio(ac97);
+	device_del(&ac97->dev);
+	ac97->bus = NULL;
+	put_device(&ac97->dev);
+}
+EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component);
+
+static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
+
+static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+	struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
+
+	pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);
+
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 1);
+
+	udelay(10);
+
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 0);
+
+	pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
+	msleep(2);
+}
+
+static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
+{
+	struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
+
+	pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);
+
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 0);
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.sdata_gpio, 0);
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.reset_gpio, 0);
+
+	udelay(10);
+
+	gpiod_direction_output_raw(snd_ac97_rst_cfg.reset_gpio, 1);
+
+	pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
+	msleep(2);
+}
+
+static int snd_soc_ac97_parse_pinctl(struct device *dev,
+		struct snd_ac97_reset_cfg *cfg)
+{
+	struct pinctrl *p;
+	struct pinctrl_state *state;
+
+	p = devm_pinctrl_get(dev);
+	if (IS_ERR(p)) {
+		dev_err(dev, "Failed to get pinctrl\n");
+		return PTR_ERR(p);
+	}
+	cfg->pctl = p;
+
+	state = pinctrl_lookup_state(p, "ac97-reset");
+	if (IS_ERR(state)) {
+		dev_err(dev, "Can't find pinctrl state ac97-reset\n");
+		return PTR_ERR(state);
+	}
+	cfg->pstate_reset = state;
+
+	state = pinctrl_lookup_state(p, "ac97-warm-reset");
+	if (IS_ERR(state)) {
+		dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
+		return PTR_ERR(state);
+	}
+	cfg->pstate_warm_reset = state;
+
+	state = pinctrl_lookup_state(p, "ac97-running");
+	if (IS_ERR(state)) {
+		dev_err(dev, "Can't find pinctrl state ac97-running\n");
+		return PTR_ERR(state);
+	}
+	cfg->pstate_run = state;
+
+	cfg->sync_gpio = devm_gpiod_get_index(dev, "ac97", 0, GPIOD_ASIS);
+	if (IS_ERR(cfg->sync_gpio))
+		return dev_err_probe(dev, PTR_ERR(cfg->sync_gpio), "Can't find ac97-sync gpio\n");
+	gpiod_set_consumer_name(cfg->sync_gpio, "AC97 link sync");
+
+	cfg->sdata_gpio = devm_gpiod_get_index(dev, "ac97", 1, GPIOD_ASIS);
+	if (IS_ERR(cfg->sdata_gpio))
+		return dev_err_probe(dev, PTR_ERR(cfg->sdata_gpio), "Can't find ac97-sdata gpio\n");
+	gpiod_set_consumer_name(cfg->sdata_gpio, "AC97 link sdata");
+
+	cfg->reset_gpio = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_ASIS);
+	if (IS_ERR(cfg->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(cfg->reset_gpio), "Can't find ac97-reset gpio\n");
+	gpiod_set_consumer_name(cfg->reset_gpio, "AC97 link reset");
+
+	return 0;
+}
+
+struct snd_ac97_bus_ops *soc_ac97_ops;
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
+{
+	if (ops == soc_ac97_ops)
+		return 0;
+
+	if (soc_ac97_ops && ops)
+		return -EBUSY;
+
+	soc_ac97_ops = ops;
+	soc_ac97_bus.ops = ops;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
+
+/**
+ * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
+ * @ops: bus ops
+ * @pdev: platform device
+ *
+ * This function sets the reset and warm_reset properties of ops and parses
+ * the device node of pdev to get pinctrl states and gpio numbers to use.
+ */
+int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
+		struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct snd_ac97_reset_cfg cfg;
+	int ret;
+
+	ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
+	if (ret)
+		return ret;
+
+	ret = snd_soc_set_ac97_ops(ops);
+	if (ret)
+		return ret;
+
+	ops->warm_reset = snd_soc_ac97_warm_reset;
+	ops->reset = snd_soc_ac97_reset;
+
+	snd_ac97_rst_cfg = cfg;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);