179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/*
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* GPIO driver for Analog Devices ADP5520 MFD PMICs
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*
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* Copyright 2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/adp5520.h>
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#include <linux/gpio/driver.h>
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struct adp5520_gpio {
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struct device *master;
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struct gpio_chip gpio_chip;
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unsigned char lut[ADP5520_MAXGPIOS];
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unsigned long output;
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};
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static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
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{
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struct adp5520_gpio *dev;
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uint8_t reg_val;
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dev = gpiochip_get_data(chip);
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/*
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* There are dedicated registers for GPIO IN/OUT.
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* Make sure we return the right value, even when configured as output
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*/
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if (test_bit(off, &dev->output))
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adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val);
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else
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adp5520_read(dev->master, ADP5520_GPIO_IN, ®_val);
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return !!(reg_val & dev->lut[off]);
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}
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static void adp5520_gpio_set_value(struct gpio_chip *chip,
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unsigned off, int val)
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{
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struct adp5520_gpio *dev;
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dev = gpiochip_get_data(chip);
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if (val)
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adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
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else
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adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
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}
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static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
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{
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struct adp5520_gpio *dev;
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dev = gpiochip_get_data(chip);
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clear_bit(off, &dev->output);
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return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
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dev->lut[off]);
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}
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static int adp5520_gpio_direction_output(struct gpio_chip *chip,
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unsigned off, int val)
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{
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struct adp5520_gpio *dev;
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int ret = 0;
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dev = gpiochip_get_data(chip);
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set_bit(off, &dev->output);
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if (val)
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ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
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dev->lut[off]);
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else
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ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
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dev->lut[off]);
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ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
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dev->lut[off]);
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return ret;
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}
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static int adp5520_gpio_probe(struct platform_device *pdev)
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{
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struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct adp5520_gpio *dev;
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struct gpio_chip *gc;
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int ret, i, gpios;
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unsigned char ctl_mask = 0;
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if (pdata == NULL) {
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dev_err(&pdev->dev, "missing platform data\n");
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return -ENODEV;
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}
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if (pdev->id != ID_ADP5520) {
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dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
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return -ENODEV;
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}
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dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
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if (dev == NULL)
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return -ENOMEM;
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dev->master = pdev->dev.parent;
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for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
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if (pdata->gpio_en_mask & (1 << i))
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dev->lut[gpios++] = 1 << i;
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if (gpios < 1) {
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ret = -EINVAL;
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goto err;
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}
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gc = &dev->gpio_chip;
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gc->direction_input = adp5520_gpio_direction_input;
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gc->direction_output = adp5520_gpio_direction_output;
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gc->get = adp5520_gpio_get_value;
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gc->set = adp5520_gpio_set_value;
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gc->can_sleep = true;
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gc->base = pdata->gpio_start;
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gc->ngpio = gpios;
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gc->label = pdev->name;
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gc->owner = THIS_MODULE;
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ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
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pdata->gpio_en_mask);
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if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
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ctl_mask |= ADP5520_C3_MODE;
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if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
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ctl_mask |= ADP5520_R3_MODE;
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if (ctl_mask)
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ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
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ctl_mask);
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ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
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pdata->gpio_pullup_mask);
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if (ret) {
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dev_err(&pdev->dev, "failed to write\n");
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goto err;
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}
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ret = devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
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if (ret)
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goto err;
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platform_set_drvdata(pdev, dev);
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return 0;
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err:
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return ret;
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}
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static struct platform_driver adp5520_gpio_driver = {
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.driver = {
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.name = "adp5520-gpio",
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},
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.probe = adp5520_gpio_probe,
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};
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module_platform_driver(adp5520_gpio_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("GPIO ADP5520 Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:adp5520-gpio");
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