132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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*
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* Copyright (C) 2014 Intel Corporation
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Author: Bin Yang <bin.yang@intel.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/sched.h>
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#include <linux/mfd/intel_mid_pmic.h>
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#include <linux/gpio.h>
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#include <asm/intel_vlv2.h>
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#define NUM_GPIO 2
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#define GPIO0_CTL 0x90
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#define GPIO0_LDO 0x91
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#define GPIO_STATUS 0x94
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static int dollarcove_gpio_direction_input(struct gpio_chip *chip,
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unsigned gpio)
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{
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int ctl = GPIO0_CTL + 2 * gpio;
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int ldo = GPIO0_LDO + 2 * gpio;
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intel_mid_pmic_writeb(ldo, 0xb);
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intel_mid_pmic_writeb(ctl, 0x2);
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return 0;
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}
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static int dollarcove_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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int ctl = GPIO0_CTL + 2 * gpio;
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int ldo = GPIO0_LDO + 2 * gpio;
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intel_mid_pmic_writeb(ldo, 0xb);
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intel_mid_pmic_writeb(ctl, value ? 1 : 0);
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return 0;
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}
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static int dollarcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
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{
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return intel_mid_pmic_readb(GPIO_STATUS) & (1 << gpio);
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}
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static void dollarcove_gpio_set(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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int ctl = GPIO0_CTL + 2 * gpio;
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intel_mid_pmic_writeb(ctl, value ? 1 : 0);
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}
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static void dollarcove_gpio_dbg_show(struct seq_file *s,
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struct gpio_chip *chip)
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{
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int i;
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u8 ctl;
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for (i = 0; i < 2; i++) {
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ctl = intel_mid_pmic_readb(GPIO0_CTL + 2 * i);
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seq_printf(s,
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" gpio-%-2d %s\n",
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i,
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(ctl & 0x7) == 0x2 ? "in" :
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(ctl & 0x7) == 0x0 ? "out-lo " :
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(ctl & 0x7) == 0x1 ? "out-hi " : "unknown");
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}
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}
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static int dollarcove_gpio_probe(struct platform_device *pdev)
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{
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int retval;
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struct device *dev = intel_mid_pmic_dev();
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static struct gpio_chip chip;
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chip.label = "intel_dollarcove";
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chip.direction_input = dollarcove_gpio_direction_input;
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chip.direction_output = dollarcove_gpio_direction_output;
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chip.get = dollarcove_gpio_get;
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chip.set = dollarcove_gpio_set;
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chip.base = -1;
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chip.ngpio = NUM_GPIO;
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chip.can_sleep = 1;
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chip.dev = dev;
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chip.dbg_show = dollarcove_gpio_dbg_show;
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retval = gpiochip_add(&chip);
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if (retval) {
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pr_warn("dollarcove: add gpio chip error: %d\n", retval);
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return retval;
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}
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return 0;
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}
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static struct platform_driver dollarcove_gpio_driver = {
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.probe = dollarcove_gpio_probe,
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.driver = {
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.name = "dollar_cove_gpio",
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},
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};
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module_platform_driver(dollarcove_gpio_driver);
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MODULE_AUTHOR("Yang Bin<bin.yang@intel.com>");
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MODULE_DESCRIPTION("Intel Dollar Cove GPIO Driver");
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MODULE_LICENSE("GPL");
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