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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-10-10 15:58:12 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2008-10-13 21:51:55 +0100
commit0e7203933224cbe09b5a9125f55b177b8dd5b1bd (patch)
treea0353af32d8a45163885df722baa96c9090ec7a3 /drivers/mfd/wm8350-gpio.c
parentc661a0b92d487ac20cc9cddbb8f4d40e4dcdbec1 (diff)
mfd: Add GPIO pin configuration support for WM8350
The WM8350 provides a number of user-configurable pins providing access to various signals generated by the functions on the chip. These are referred to as GPIO pins in the device documentation but in Linux terms they are more general than that, providing configuration of alternate functions. This patch implements support for selecting the alternate functions for these pins. They can also be used as GPIOs in the normal Linux sense - a subsequent patch will add support for doing so. This code was all written by Liam Girdwood and has had minor updates and rearrangements by Mark Brown. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Samuel Ortiz <sameo@openedhand.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/mfd/wm8350-gpio.c')
-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);