250 lines
6.4 KiB
C
250 lines
6.4 KiB
C
/* Smedia Glamo 336x/337x gpio driver
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*
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* (C) 2009 Lars-Peter Clausen
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/mfd/glamo.h>
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#include "glamo-core.h"
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#include "glamo-regs.h"
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#define GLAMO_NR_GPIOS 21
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#define GLAMO_NR_GPIO_REGS DIV_ROUND_UP(GLAMO_NR_GPIOS, 4)
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#define GLAMO_REG_GPIO(x) (((x) * 2) + GLAMO_REG_GPIO_GEN1)
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struct glamo_gpio {
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struct glamo_core *glamo;
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struct gpio_chip chip;
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uint16_t saved_regs[GLAMO_NR_GPIO_REGS];
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};
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#define REG_OF_GPIO(gpio) (GLAMO_REG_GPIO(gpio >> 2))
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#define NUM_OF_GPIO(gpio) (gpio & 0x3)
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#define DIRECTION_BIT(gpio) BIT(NUM_OF_GPIO(gpio) + 0)
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#define OUTPUT_BIT(gpio) BIT(NUM_OF_GPIO(gpio) + 4)
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#define OUTPUT_VALUE(gpio, value) (value << (NUM_OF_GPIO(gpio) + 4))
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#define INPUT_BIT(gpio) BIT(NUM_OF_GPIO(gpio) + 8)
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#define FUNC_BIT(gpio) BIT(NUM_OF_GPIO(gpio) + 12)
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static inline struct glamo_core *chip_to_glamo(struct gpio_chip *chip)
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{
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return container_of(chip, struct glamo_gpio, chip)->glamo;
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}
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static void glamo_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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unsigned int reg = REG_OF_GPIO(offset);
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glamo_reg_set_bit_mask(reg, OUTPUT_VALUE(offset, !!value), OUTPUT_BIT(offset));
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}
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static int glamo_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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return !!(glamo_reg_read(glamo, REG_OF_GPIO(offset)) & INPUT_BIT(offset));
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}
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static int glamo_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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unsigned int reg = REG_OF_GPIO(offset);
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glamo_reg_set_bit(glamo, reg, FUNC_BIT(offset));
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return 0;
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}
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static void glamo_gpio_free(struct gpio_chip *chip, unsigned offset)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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unsigned int reg = REG_OF_GPIO(offset);
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glamo_reg_clear_bit(glamo, reg, FUNC_BIT(offset));
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}
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static int glamo_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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unsigned int reg = REG_OF_GPIO(offset);
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uint16_t mask = DIRECTION_BIT(offset) | OUTPUT_BIT(offset);
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uint16_t value = DIRECTION_BIT(offset);
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if (value)
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value |= OUTPUT_BIT(offset);
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glamo_reg_set_bit_mask(glamo, reg, mask, value);
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return 0;
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}
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static int glamo_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct glamo_core *glamo = chip_to_glamo(chip);
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unsigned int reg = REG_OF_GPIO(offset);
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glamo_reg_set_bit(glamo, reg, DIRECTION_BIT(offset));
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return 0;
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}
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static const struct __devinit gpio_chip glamo_gpio_chip = {
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.label = "glamo",
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.request = glamo_gpio_request,
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.free = glamo_gpio_free,
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.direction_input = glamo_gpio_direction_input,
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.get = glamo_gpio_get,
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.direction_output = glamo_gpio_direction_output,
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.set = glamo_gpio_set,
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.base = -1,
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.ngpio = GLAMO_NR_GPIOS,
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.can_sleep = 0,
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.owner = THIS_MODULE,
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};
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static int __devinit glamo_gpio_probe(struct platform_device *pdev)
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{
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struct glamo_platform_data *pdata = pdev->dev.parent->platform_data;
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struct glamo_gpio *glamo_gpio;
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int ret;
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glamo_gpio = kzalloc(sizeof(struct glamo_gpio), GFP_KERNEL);
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if (!glamo_gpio)
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return -ENOMEM;
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glamo_gpio->glamo = dev_get_drvdata(pdev->dev.parent);
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glamo_gpio->chip = glamo_gpio_chip;
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glamo_gpio->chip.dev = &pdev->dev;
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if (pdata)
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glamo_gpio->chip.base = pdata->gpio_base;
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ret = gpiochip_add(&glamo_gpio->chip);
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if (ret) {
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dev_err(&pdev->dev, "Could not register gpio chip: %d\n", ret);
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goto err;
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}
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platform_set_drvdata(pdev, glamo_gpio);
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return 0;
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err:
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kfree(glamo_gpio);
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return ret;
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}
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static int __devexit glamo_gpio_remove(struct platform_device *pdev)
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{
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struct glamo_gpio *glamo_gpio = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&glamo_gpio->chip);
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if (!ret)
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goto done;
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platform_set_drvdata(pdev, NULL);
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kfree(glamo_gpio);
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done:
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return ret;
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}
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#ifdef CONFIG_PM
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static int glamo_gpio_suspend(struct device *dev)
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{
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struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev);
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struct glamo_core *glamo = glamo_gpio->glamo;
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uint16_t *saved_regs = glamo_gpio->saved_regs;
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int i;
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spin_lock(&glamo->lock);
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for (i = 0; i < GLAMO_NR_GPIO_REGS; ++i)
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saved_regs[i] = readw(glamo->base + GLAMO_REG_GPIO(i));
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spin_unlock(&glamo->lock);
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return 0;
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}
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static int glamo_gpio_resume(struct device *dev)
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{
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struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev);
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struct glamo_core *glamo = glamo_gpio->glamo;
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uint16_t *saved_regs = glamo_gpio->saved_regs;
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int i;
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spin_lock(&glamo->lock);
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for (i = 0; i < GLAMO_NR_GPIO_REGS; ++i)
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writew(saved_regs[i], glamo->base + GLAMO_REG_GPIO(i));
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spin_unlock(&glamo->lock);
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printk("glamo-gpio resume\n");
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return 0;
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}
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static const struct dev_pm_ops glamo_pm_ops = {
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.suspend = glamo_gpio_suspend,
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.resume = glamo_gpio_resume,
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.freeze = glamo_gpio_suspend,
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.thaw = glamo_gpio_resume,
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};
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#define GLAMO_GPIO_PM_OPS (&glamo_pm_ops)
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#else
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#define GLAMO_GPIO_PM_OPS NULL
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#endif
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static struct platform_driver glamo_gpio_driver = {
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.driver = {
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.name = "glamo-gpio",
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.owner = THIS_MODULE,
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.pm = GLAMO_GPIO_PM_OPS,
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},
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.probe = glamo_gpio_probe,
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.remove = __devexit_p(glamo_gpio_remove),
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};
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static int __devinit glamo_gpio_init(void)
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{
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return platform_driver_register(&glamo_gpio_driver);
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}
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static void __exit glamo_gpio_exit(void)
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{
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platform_driver_unregister(&glamo_gpio_driver);
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}
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module_init(glamo_gpio_init);
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module_exit(glamo_gpio_exit);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("GPIO interface for the Glamo multimedia device");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:glamo-gpio");
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