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path: root/drivers/mfd/wm8350-gpio.c
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-rw-r--r--drivers/mfd/wm8350-gpio.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/mfd/wm8350-gpio.c b/drivers/mfd/wm8350-gpio.c
new file mode 100644
index 000000000000..ebf99bef392f
--- /dev/null
+++ b/drivers/mfd/wm8350-gpio.c
@@ -0,0 +1,222 @@
+/*
+ * wm8350-core.c -- Device access for Wolfson WM8350
+ *
+ * Copyright 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ * Author: Liam Girdwood
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+
+#include <linux/mfd/wm8350/core.h>
+#include <linux/mfd/wm8350/gpio.h>
+#include <linux/mfd/wm8350/pmic.h>
+
+static int gpio_set_dir(struct wm8350 *wm8350, int gpio, int dir)
+{
+ int ret;
+
+ wm8350_reg_unlock(wm8350);
+ if (dir == WM8350_GPIO_DIR_OUT)
+ ret = wm8350_clear_bits(wm8350,
+ WM8350_GPIO_CONFIGURATION_I_O,
+ 1 << gpio);
+ else
+ ret = wm8350_set_bits(wm8350,
+ WM8350_GPIO_CONFIGURATION_I_O,
+ 1 << gpio);
+ wm8350_reg_lock(wm8350);
+ return ret;
+}
+
+static int gpio_set_debounce(struct wm8350 *wm8350, int gpio, int db)
+{
+ if (db == WM8350_GPIO_DEBOUNCE_ON)
+ return wm8350_set_bits(wm8350, WM8350_GPIO_DEBOUNCE,
+ 1 << gpio);
+ else
+ return wm8350_clear_bits(wm8350,
+ WM8350_GPIO_DEBOUNCE, 1 << gpio);
+}
+
+static int gpio_set_func(struct wm8350 *wm8350, int gpio, int func)
+{
+ u16 reg;
+
+ wm8350_reg_unlock(wm8350);
+ switch (gpio) {
+ case 0:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
+ & ~WM8350_GP0_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
+ reg | ((func & 0xf) << 0));
+ break;
+ case 1:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
+ & ~WM8350_GP1_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
+ reg | ((func & 0xf) << 4));
+ break;
+ case 2:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
+ & ~WM8350_GP2_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
+ reg | ((func & 0xf) << 8));
+ break;
+ case 3:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
+ & ~WM8350_GP3_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
+ reg | ((func & 0xf) << 12));
+ break;
+ case 4:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
+ & ~WM8350_GP4_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
+ reg | ((func & 0xf) << 0));
+ break;
+ case 5:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
+ & ~WM8350_GP5_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
+ reg | ((func & 0xf) << 4));
+ break;
+ case 6:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
+ & ~WM8350_GP6_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
+ reg | ((func & 0xf) << 8));
+ break;
+ case 7:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
+ & ~WM8350_GP7_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
+ reg | ((func & 0xf) << 12));
+ break;
+ case 8:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
+ & ~WM8350_GP8_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
+ reg | ((func & 0xf) << 0));
+ break;
+ case 9:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
+ & ~WM8350_GP9_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
+ reg | ((func & 0xf) << 4));
+ break;
+ case 10:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
+ & ~WM8350_GP10_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
+ reg | ((func & 0xf) << 8));
+ break;
+ case 11:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
+ & ~WM8350_GP11_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
+ reg | ((func & 0xf) << 12));
+ break;
+ case 12:
+ reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_4)
+ & ~WM8350_GP12_FN_MASK;
+ wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_4,
+ reg | ((func & 0xf) << 0));
+ break;
+ default:
+ wm8350_reg_lock(wm8350);
+ return -EINVAL;
+ }
+
+ wm8350_reg_lock(wm8350);
+ return 0;
+}
+
+static int gpio_set_pull_up(struct wm8350 *wm8350, int gpio, int up)
+{
+ if (up)
+ return wm8350_set_bits(wm8350,
+ WM8350_GPIO_PIN_PULL_UP_CONTROL,
+ 1 << gpio);
+ else
+ return wm8350_clear_bits(wm8350,
+ WM8350_GPIO_PIN_PULL_UP_CONTROL,
+ 1 << gpio);
+}
+
+static int gpio_set_pull_down(struct wm8350 *wm8350, int gpio, int down)
+{
+ if (down)
+ return wm8350_set_bits(wm8350,
+ WM8350_GPIO_PULL_DOWN_CONTROL,
+ 1 << gpio);
+ else
+ return wm8350_clear_bits(wm8350,
+ WM8350_GPIO_PULL_DOWN_CONTROL,
+ 1 << gpio);
+}
+
+static int gpio_set_polarity(struct wm8350 *wm8350, int gpio, int pol)
+{
+ if (pol == WM8350_GPIO_ACTIVE_HIGH)
+ return wm8350_set_bits(wm8350,
+ WM8350_GPIO_PIN_POLARITY_TYPE,
+ 1 << gpio);
+ else
+ return wm8350_clear_bits(wm8350,
+ WM8350_GPIO_PIN_POLARITY_TYPE,
+ 1 << gpio);
+}
+
+static int gpio_set_invert(struct wm8350 *wm8350, int gpio, int invert)
+{
+ if (invert == WM8350_GPIO_INVERT_ON)
+ return wm8350_set_bits(wm8350, WM8350_GPIO_INT_MODE, 1 << gpio);
+ else
+ return wm8350_clear_bits(wm8350,
+ WM8350_GPIO_INT_MODE, 1 << gpio);
+}
+
+int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
+ int pol, int pull, int invert, int debounce)
+{
+ /* make sure we never pull up and down at the same time */
+ if (pull == WM8350_GPIO_PULL_NONE) {
+ if (gpio_set_pull_up(wm8350, gpio, 0))
+ goto err;
+ if (gpio_set_pull_down(wm8350, gpio, 0))
+ goto err;
+ } else if (pull == WM8350_GPIO_PULL_UP) {
+ if (gpio_set_pull_down(wm8350, gpio, 0))
+ goto err;
+ if (gpio_set_pull_up(wm8350, gpio, 1))
+ goto err;
+ } else if (pull == WM8350_GPIO_PULL_DOWN) {
+ if (gpio_set_pull_up(wm8350, gpio, 0))
+ goto err;
+ if (gpio_set_pull_down(wm8350, gpio, 1))
+ goto err;
+ }
+
+ if (gpio_set_invert(wm8350, gpio, invert))
+ goto err;
+ if (gpio_set_polarity(wm8350, gpio, pol))
+ goto err;
+ if (gpio_set_debounce(wm8350, gpio, debounce))
+ goto err;
+ if (gpio_set_dir(wm8350, gpio, dir))
+ goto err;
+ return gpio_set_func(wm8350, gpio, func);
+
+err:
+ return -EIO;
+}
+EXPORT_SYMBOL_GPL(wm8350_gpio_config);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 10:06:39 +0100