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path: root/drivers/gpio/gpio-wm8994.c
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-rw-r--r--drivers/gpio/gpio-wm8994.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-wm8994.c b/drivers/gpio/gpio-wm8994.c
new file mode 100644
index 000000000..f4a474cef
--- /dev/null
+++ b/drivers/gpio/gpio-wm8994.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * gpiolib support for Wolfson WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/wm8994/core.h>
+#include <linux/mfd/wm8994/pdata.h>
+#include <linux/mfd/wm8994/gpio.h>
+#include <linux/mfd/wm8994/registers.h>
+
+struct wm8994_gpio {
+ struct wm8994 *wm8994;
+ struct gpio_chip gpio_chip;
+};
+
+static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ switch (wm8994->type) {
+ case WM8958:
+ switch (offset) {
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 6:
+ return -EINVAL;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
+ WM8994_GPN_DIR, WM8994_GPN_DIR);
+}
+
+static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+ int ret;
+
+ ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
+ if (ret < 0)
+ return ret;
+
+ if (ret & WM8994_GPN_LVL)
+ return 1;
+ else
+ return 0;
+}
+
+static int wm8994_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ if (value)
+ value = WM8994_GPN_LVL;
+
+ return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
+ WM8994_GPN_DIR | WM8994_GPN_LVL, value);
+}
+
+static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ if (value)
+ value = WM8994_GPN_LVL;
+
+ wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
+}
+
+static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
+ WM8994_GPN_OP_CFG_MASK,
+ WM8994_GPN_OP_CFG);
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
+ WM8994_GPN_OP_CFG_MASK, 0);
+ default:
+ break;
+ }
+
+ return -ENOTSUPP;
+}
+
+static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+
+ return regmap_irq_get_virq(wm8994->irq_data, offset);
+}
+
+
+#ifdef CONFIG_DEBUG_FS
+static const char *wm8994_gpio_fn(u16 fn)
+{
+ switch (fn) {
+ case WM8994_GP_FN_PIN_SPECIFIC:
+ return "pin-specific";
+ case WM8994_GP_FN_GPIO:
+ return "GPIO";
+ case WM8994_GP_FN_SDOUT:
+ return "SDOUT";
+ case WM8994_GP_FN_IRQ:
+ return "IRQ";
+ case WM8994_GP_FN_TEMPERATURE:
+ return "Temperature";
+ case WM8994_GP_FN_MICBIAS1_DET:
+ return "MICBIAS1 detect";
+ case WM8994_GP_FN_MICBIAS1_SHORT:
+ return "MICBIAS1 short";
+ case WM8994_GP_FN_MICBIAS2_DET:
+ return "MICBIAS2 detect";
+ case WM8994_GP_FN_MICBIAS2_SHORT:
+ return "MICBIAS2 short";
+ case WM8994_GP_FN_FLL1_LOCK:
+ return "FLL1 lock";
+ case WM8994_GP_FN_FLL2_LOCK:
+ return "FLL2 lock";
+ case WM8994_GP_FN_SRC1_LOCK:
+ return "SRC1 lock";
+ case WM8994_GP_FN_SRC2_LOCK:
+ return "SRC2 lock";
+ case WM8994_GP_FN_DRC1_ACT:
+ return "DRC1 activity";
+ case WM8994_GP_FN_DRC2_ACT:
+ return "DRC2 activity";
+ case WM8994_GP_FN_DRC3_ACT:
+ return "DRC3 activity";
+ case WM8994_GP_FN_WSEQ_STATUS:
+ return "Write sequencer";
+ case WM8994_GP_FN_FIFO_ERROR:
+ return "FIFO error";
+ case WM8994_GP_FN_OPCLK:
+ return "OPCLK";
+ case WM8994_GP_FN_THW:
+ return "Thermal warning";
+ case WM8994_GP_FN_DCS_DONE:
+ return "DC servo";
+ case WM8994_GP_FN_FLL1_OUT:
+ return "FLL1 output";
+ case WM8994_GP_FN_FLL2_OUT:
+ return "FLL1 output";
+ default:
+ return "Unknown";
+ }
+}
+
+static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
+ struct wm8994 *wm8994 = wm8994_gpio->wm8994;
+ int i;
+
+ for (i = 0; i < chip->ngpio; i++) {
+ int gpio = i + chip->base;
+ int reg;
+ const char *label;
+
+ /* We report the GPIO even if it's not requested since
+ * we're also reporting things like alternate
+ * functions which apply even when the GPIO is not in
+ * use as a GPIO.
+ */
+ label = gpiochip_is_requested(chip, i);
+ if (!label)
+ label = "Unrequested";
+
+ seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
+
+ reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
+ if (reg < 0) {
+ dev_err(wm8994->dev,
+ "GPIO control %d read failed: %d\n",
+ gpio, reg);
+ seq_printf(s, "\n");
+ continue;
+ }
+
+ if (reg & WM8994_GPN_DIR)
+ seq_printf(s, "in ");
+ else
+ seq_printf(s, "out ");
+
+ if (reg & WM8994_GPN_PU)
+ seq_printf(s, "pull up ");
+
+ if (reg & WM8994_GPN_PD)
+ seq_printf(s, "pull down ");
+
+ if (reg & WM8994_GPN_POL)
+ seq_printf(s, "inverted ");
+ else
+ seq_printf(s, "noninverted ");
+
+ if (reg & WM8994_GPN_OP_CFG)
+ seq_printf(s, "open drain ");
+ else
+ seq_printf(s, "push-pull ");
+
+ seq_printf(s, "%s (%x)\n",
+ wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
+ }
+}
+#else
+#define wm8994_gpio_dbg_show NULL
+#endif
+
+static const struct gpio_chip template_chip = {
+ .label = "wm8994",
+ .owner = THIS_MODULE,
+ .request = wm8994_gpio_request,
+ .direction_input = wm8994_gpio_direction_in,
+ .get = wm8994_gpio_get,
+ .direction_output = wm8994_gpio_direction_out,
+ .set = wm8994_gpio_set,
+ .set_config = wm8994_gpio_set_config,
+ .to_irq = wm8994_gpio_to_irq,
+ .dbg_show = wm8994_gpio_dbg_show,
+ .can_sleep = true,
+};
+
+static int wm8994_gpio_probe(struct platform_device *pdev)
+{
+ struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
+ struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
+ struct wm8994_gpio *wm8994_gpio;
+
+ wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
+ GFP_KERNEL);
+ if (wm8994_gpio == NULL)
+ return -ENOMEM;
+
+ wm8994_gpio->wm8994 = wm8994;
+ wm8994_gpio->gpio_chip = template_chip;
+ wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
+ wm8994_gpio->gpio_chip.parent = &pdev->dev;
+ if (pdata && pdata->gpio_base)
+ wm8994_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ wm8994_gpio->gpio_chip.base = -1;
+
+ return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
+}
+
+static struct platform_driver wm8994_gpio_driver = {
+ .driver.name = "wm8994-gpio",
+ .probe = wm8994_gpio_probe,
+};
+
+static int __init wm8994_gpio_init(void)
+{
+ return platform_driver_register(&wm8994_gpio_driver);
+}
+subsys_initcall(wm8994_gpio_init);
+
+static void __exit wm8994_gpio_exit(void)
+{
+ platform_driver_unregister(&wm8994_gpio_driver);
+}
+module_exit(wm8994_gpio_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for WM8994");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8994-gpio");