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-rw-r--r--sound/soc/soc-ac97.c421
1 files changed, 421 insertions, 0 deletions
diff --git a/sound/soc/soc-ac97.c b/sound/soc/soc-ac97.c
new file mode 100644
index 000000000..32c5be61e
--- /dev/null
+++ b/sound/soc/soc-ac97.c
@@ -0,0 +1,421 @@
+// 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.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/of_gpio.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;
+ int gpio_sdata;
+ int gpio_sync;
+ int gpio_reset;
+};
+
+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);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);
+
+ udelay(10);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 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);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);
+
+ udelay(10);
+
+ gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 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;
+ int gpio;
+ int ret;
+
+ 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;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-sync gpio\n");
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link sync");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-sync gpio\n");
+ return ret;
+ }
+ cfg->gpio_sync = gpio;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-sdata gpio\n");
+ return ret;
+ }
+ cfg->gpio_sdata = gpio;
+
+ gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
+ if (gpio < 0) {
+ dev_err(dev, "Can't find ac97-reset gpio\n");
+ return gpio;
+ }
+ ret = devm_gpio_request(dev, gpio, "AC97 link reset");
+ if (ret) {
+ dev_err(dev, "Failed requesting ac97-reset gpio\n");
+ return ret;
+ }
+ cfg->gpio_reset = gpio;
+
+ 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);