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Date: Sat, 11 Oct 2008 16:09:51 +0200
From: Samuel Ortiz <sameo@...nedhand.com>
To: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/14] mfd: Add GPIO pin configuration support for
WM8350
On Fri, Oct 10, 2008 at 03:58:12PM +0100, Mark Brown wrote:
> 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.
I expect it to implement the giolib interface, right ?
Cheers,
Samuel.
> This code was all written by Liam Girdwood and has had minor updates
> and rearrangements by Mark Brown.
>
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
> drivers/mfd/Makefile | 2 +-
> drivers/mfd/wm8350-gpio.c | 222 +++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/wm8350/gpio.h | 10 ++
> 3 files changed, 233 insertions(+), 1 deletions(-)
> create mode 100644 drivers/mfd/wm8350-gpio.c
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 746d37b..8c0b7f2 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -13,7 +13,7 @@ obj-$(CONFIG_MFD_TC6387XB) += tc6387xb.o
> obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o
>
> obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
> -wm8350-objs := wm8350-core.o wm8350-regmap.o
> +wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
> obj-$(CONFIG_MFD_WM8350) += wm8350.o
> obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
>
> diff --git a/drivers/mfd/wm8350-gpio.c b/drivers/mfd/wm8350-gpio.c
> new file mode 100644
> index 0000000..ebf99be
> --- /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);
> diff --git a/include/linux/mfd/wm8350/gpio.h b/include/linux/mfd/wm8350/gpio.h
> index 928aa6e..c6cd2ca 100644
> --- a/include/linux/mfd/wm8350/gpio.h
> +++ b/include/linux/mfd/wm8350/gpio.h
> @@ -323,4 +323,14 @@
> #define WM8350_GP1_LVL 0x0002
> #define WM8350_GP0_LVL 0x0001
>
> +struct wm8350;
> +
> +int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
> + int pol, int pull, int invert, int debounce);
> +
> +/*
> + * GPIO Interrupts
> + */
> +#define WM8350_IRQ_GPIO(x) (50 + x)
> +
> #endif
> --
> 1.5.6.5
>
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