diff options
Diffstat (limited to 'drivers/gpio/adp5520-gpio.c')
| -rw-r--r-- | drivers/gpio/adp5520-gpio.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/gpio/adp5520-gpio.c b/drivers/gpio/adp5520-gpio.c new file mode 100644 index 000000000000..ad05bbc7ffd5 --- /dev/null +++ b/drivers/gpio/adp5520-gpio.c @@ -0,0 +1,206 @@ +/* + * GPIO driver for Analog Devices ADP5520 MFD PMICs + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/mfd/adp5520.h> + +#include <linux/gpio.h> + +struct adp5520_gpio { + struct device *master; + struct gpio_chip gpio_chip; + unsigned char lut[ADP5520_MAXGPIOS]; + unsigned long output; +}; + +static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off) +{ + struct adp5520_gpio *dev; + uint8_t reg_val; + + dev = container_of(chip, struct adp5520_gpio, gpio_chip); + + /* + * There are dedicated registers for GPIO IN/OUT. + * Make sure we return the right value, even when configured as output + */ + + if (test_bit(off, &dev->output)) + adp5520_read(dev->master, GPIO_OUT, ®_val); + else + adp5520_read(dev->master, GPIO_IN, ®_val); + + return !!(reg_val & dev->lut[off]); +} + +static void adp5520_gpio_set_value(struct gpio_chip *chip, + unsigned off, int val) +{ + struct adp5520_gpio *dev; + dev = container_of(chip, struct adp5520_gpio, gpio_chip); + + if (val) + adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]); + else + adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]); +} + +static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off) +{ + struct adp5520_gpio *dev; + dev = container_of(chip, struct adp5520_gpio, gpio_chip); + + clear_bit(off, &dev->output); + + return adp5520_clr_bits(dev->master, GPIO_CFG_2, dev->lut[off]); +} + +static int adp5520_gpio_direction_output(struct gpio_chip *chip, + unsigned off, int val) +{ + struct adp5520_gpio *dev; + int ret = 0; + dev = container_of(chip, struct adp5520_gpio, gpio_chip); + + set_bit(off, &dev->output); + + if (val) + ret |= adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]); + else + ret |= adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]); + + ret |= adp5520_set_bits(dev->master, GPIO_CFG_2, dev->lut[off]); + + return ret; +} + +static int __devinit adp5520_gpio_probe(struct platform_device *pdev) +{ + struct adp5520_gpio_platfrom_data *pdata = pdev->dev.platform_data; + struct adp5520_gpio *dev; + struct gpio_chip *gc; + int ret, i, gpios; + unsigned char ctl_mask = 0; + + if (pdata == NULL) { + dev_err(&pdev->dev, "missing platform data\n"); + return -ENODEV; + } + + if (pdev->id != ID_ADP5520) { + dev_err(&pdev->dev, "only ADP5520 supports GPIO\n"); + return -ENODEV; + } + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (dev == NULL) { + dev_err(&pdev->dev, "failed to alloc memory\n"); + return -ENOMEM; + } + + dev->master = pdev->dev.parent; + + for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++) + if (pdata->gpio_en_mask & (1 << i)) + dev->lut[gpios++] = 1 << i; + + if (gpios < 1) { + ret = -EINVAL; + goto err; + } + + gc = &dev->gpio_chip; + gc->direction_input = adp5520_gpio_direction_input; + gc->direction_output = adp5520_gpio_direction_output; + gc->get = adp5520_gpio_get_value; + gc->set = adp5520_gpio_set_value; + gc->can_sleep = 1; + + gc->base = pdata->gpio_start; + gc->ngpio = gpios; + gc->label = pdev->name; + gc->owner = THIS_MODULE; + + ret = adp5520_clr_bits(dev->master, GPIO_CFG_1, + pdata->gpio_en_mask); + + if (pdata->gpio_en_mask & GPIO_C3) + ctl_mask |= C3_MODE; + + if (pdata->gpio_en_mask & GPIO_R3) + ctl_mask |= R3_MODE; + + if (ctl_mask) + ret = adp5520_set_bits(dev->master, LED_CONTROL, + ctl_mask); + + ret |= adp5520_set_bits(dev->master, GPIO_PULLUP, + pdata->gpio_pullup_mask); + + if (ret) { + dev_err(&pdev->dev, "failed to write\n"); + goto err; + } + + ret = gpiochip_add(&dev->gpio_chip); + if (ret) + goto err; + + platform_set_drvdata(pdev, dev); + return 0; + +err: + kfree(dev); + return ret; +} + +static int __devexit adp5520_gpio_remove(struct platform_device *pdev) +{ + struct adp5520_gpio *dev; + int ret; + + dev = platform_get_drvdata(pdev); + ret = gpiochip_remove(&dev->gpio_chip); + if (ret) { + dev_err(&pdev->dev, "%s failed, %d\n", + "gpiochip_remove()", ret); + return ret; + } + + kfree(dev); + return 0; +} + +static struct platform_driver adp5520_gpio_driver = { + .driver = { + .name = "adp5520-gpio", + .owner = THIS_MODULE, + }, + .probe = adp5520_gpio_probe, + .remove = __devexit_p(adp5520_gpio_remove), +}; + +static int __init adp5520_gpio_init(void) +{ + return platform_driver_register(&adp5520_gpio_driver); +} +module_init(adp5520_gpio_init); + +static void __exit adp5520_gpio_exit(void) +{ + platform_driver_unregister(&adp5520_gpio_driver); +} +module_exit(adp5520_gpio_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("GPIO ADP5520 Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:adp5520-gpio"); |