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