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Diffstat (limited to 'package/kernel/leds-apu2/src/leds-apu2.c')
| -rw-r--r-- | package/kernel/leds-apu2/src/leds-apu2.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/package/kernel/leds-apu2/src/leds-apu2.c b/package/kernel/leds-apu2/src/leds-apu2.c new file mode 100644 index 0000000000..00f80a3fa8 --- /dev/null +++ b/package/kernel/leds-apu2/src/leds-apu2.c @@ -0,0 +1,374 @@ +/* +* APU2 LED/GPIO Driver +* Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com> +* +* Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board +* +* Copyright (c) 2015 Carsten Spiess <fli4l at carsten-spiess.de> +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/miscdevice.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/ioport.h> +#include <linux/platform_device.h> +#include <linux/uaccess.h> +#include <linux/io.h> +#include <linux/version.h> +#include <linux/dmi.h> +#include <linux/string.h> + +#include <linux/leds.h> +#include <linux/input.h> +#include <linux/gpio_keys.h> + +#define DEVNAME "leds-apu2" + +#define FCH_ACPI_MMIO_BASE 0xFED80000 +#define FCH_GPIO_BASE (FCH_ACPI_MMIO_BASE + 0x1500) +#define FCH_GPIO_SIZE 0x300 + +#define APU_NUM_GPIO 4 + +#define GPIO_BIT_DIR 23 +#define GPIO_BIT_WRITE 22 +#define GPIO_BIT_READ 16 + +/* internal variables */ +static struct pci_dev *gpio_apu2_pci; +static DEFINE_SPINLOCK (gpio_lock); + +/* the watchdog platform device */ +static struct platform_device *gpio_apu2_platform_device; +static struct platform_device *leddev; +static struct platform_device *keydev; + +static const struct pci_device_id gpio_apu2_pci_tbl[] ={ + {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, PCI_ANY_ID}, + { 0, } /* End of list */ +}; +MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl); + +/* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */ +static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70}; + +static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL}; + +static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset) +{ + u32 val; + + val = ~ioread32 (gpio_addr[offset]); + + return (val >> GPIO_BIT_DIR) & 1; +} + +static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset) +{ + u32 val; + + spin_lock_bh (&gpio_lock); + + val = ioread32 (gpio_addr[offset]); + val &= ~BIT(GPIO_BIT_DIR); + iowrite32 (val, gpio_addr[offset]); + + spin_unlock_bh (&gpio_lock); + + return 0; +} + +static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset, + int value) +{ + u32 val; + + spin_lock_bh (&gpio_lock); + + val = ioread32 (gpio_addr[offset]); + val |= BIT(GPIO_BIT_DIR); + iowrite32 (val, gpio_addr[offset]); + + spin_unlock_bh (&gpio_lock); + + return 0; +} + +static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset) +{ + u32 val; + + val = ioread32 (gpio_addr[offset]); + + return (val >> GPIO_BIT_READ) & 1; +} + +static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value) +{ + u32 val; + + spin_lock_bh (&gpio_lock); + + val = ioread32 (gpio_addr[offset]); + + if (value) + val |= BIT(GPIO_BIT_WRITE); + else + val &= ~BIT(GPIO_BIT_WRITE); + + iowrite32 (val, gpio_addr[offset]); + + spin_unlock_bh (&gpio_lock); +} + +static struct gpio_chip gpio_apu2_chip = { + .label = DEVNAME, + .owner = THIS_MODULE, + .base = -1, + .ngpio = APU_NUM_GPIO, + .get_direction = gpio_apu2_get_dir, + .direction_input = gpio_apu2_dir_in, + .direction_output = gpio_apu2_dir_out, + .get = gpio_apu2_get_data, + .set = gpio_apu2_set_data, +}; + +/* + * + */ +static int gpio_apu2_probe (struct platform_device *dev) +{ + int ret = 0; + int i; + struct pci_dev *pci_dev = NULL; + + /* Match the PCI device */ + for_each_pci_dev (pci_dev) { + if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) { + gpio_apu2_pci = pci_dev; + break; + } + } + + if (!gpio_apu2_pci) + return -ENODEV; + + pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision); + + /* Determine type of southbridge chipset */ + if (gpio_apu2_pci->revision < 0x40) { + return -EACCES; + } + + /* Request memory region for GPIO's */ + if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE, + FCH_GPIO_SIZE, DEVNAME)){ + pr_err ("%s: request GPIO mem region failed\n", DEVNAME); + return -ENXIO; + } + + /* Map IO's for GPIO's */ + for (i = 0; i < APU_NUM_GPIO; i++) { + gpio_addr[i] = devm_ioremap (&dev->dev, + FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof (u32)); + if (!gpio_addr[i]) { + pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]); + return -ENXIO; + } + } + + gpio_apu2_chip.dev = &dev->dev; + ret = gpiochip_add (&gpio_apu2_chip); + if (ret) { + pr_err ("%s: adding gpiochip failed\n", DEVNAME); + } + + return ret; +} + +static int gpio_apu2_remove (struct platform_device *dev) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) + int ret; + ret = gpiochip_remove (&gpio_apu2_chip); +#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */ + gpiochip_remove (&gpio_apu2_chip); +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */ + return 0; +} + +static struct platform_driver gpio_apu2_driver = { + .probe = gpio_apu2_probe, + .remove = gpio_apu2_remove, + .driver = { + .owner = THIS_MODULE, + .name = DEVNAME + } +}; + +static struct gpio_led apu2_leds_gpio[] = { + { + .name = "apu2:green:power", + .gpio = 509, + .active_low = 1, + }, + { + .name = "apu2:green:led2", + .gpio = 510, + .active_low = 1, + }, + { + .name = "apu2:green:led3", + .gpio = 511, + .active_low = 1, + }, +}; + +static struct gpio_keys_button apu2_gpio_keys[] = { + { + .desc = "Reset button", + .type = EV_KEY, + .code = KEY_RESTART, + .debounce_interval = 60, + .gpio = 508, + .active_low = 1, + }, +}; + +static void register_gpio_keys_polled(int id, unsigned poll_interval, + unsigned nbuttons, + struct gpio_keys_button *buttons) +{ + struct gpio_keys_platform_data pdata = { }; + int err; + + keydev = platform_device_alloc("gpio-keys-polled", id); + if (!keydev) { + printk(KERN_ERR "Failed to allocate gpio-keys platform device\n"); + return; + } + + pdata.poll_interval = poll_interval; + pdata.nbuttons = nbuttons; + pdata.buttons = buttons; + + err = platform_device_add_data(keydev, &pdata, sizeof(pdata)); + if (err) { + dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err); + goto err_put_pdev; + } + + err = platform_device_add(keydev); + if (err) { + dev_err(&keydev->dev, "failed to register key platform device (%d)", err); + goto err_put_pdev; + } + + return; + +err_put_pdev: + platform_device_put(keydev); + keydev = NULL; +} + +static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds) +{ + struct gpio_led_platform_data pdata = { }; + int err; + + leddev = platform_device_alloc("leds-gpio", id); + if (!leddev) { + printk(KERN_ERR "Failed to allocate leds-gpio platform device\n"); + return; + } + + pdata.num_leds = num_leds; + pdata.leds = leds; + + err = platform_device_add_data(leddev, &pdata, sizeof(pdata)); + if (err) { + dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err); + goto err_put_pdev; + } + + err = platform_device_add(leddev); + if (err) { + dev_err(&leddev->dev, "failed to register key platform device (%d)", err); + goto err_put_pdev; + } + + return; + +err_put_pdev: + platform_device_put(leddev); + leddev = NULL; +} + +static int __init gpio_apu2_init (void) +{ + int err; + const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR); + const char *board_name = dmi_get_system_info(DMI_BOARD_NAME); + + /* Match the device name/model */ + if (!board_name || !board_vendor || strcasecmp(board_vendor, "PC Engines") || strcasecmp(board_name, "apu2")) { + err = -ENODEV; + goto exit; + } + + pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME); + + err = platform_driver_register (&gpio_apu2_driver); + if (err) + goto exit; + + gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0); + if (IS_ERR(gpio_apu2_platform_device)) { + err = PTR_ERR(gpio_apu2_platform_device); + goto exit_driver; + } + + pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME); + + register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio); + register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys); + return 0; + +exit_driver: + platform_driver_unregister (&gpio_apu2_driver); +exit: + return err; +} + +static void __exit gpio_apu2_exit (void) +{ + platform_device_unregister (gpio_apu2_platform_device); + platform_device_unregister (leddev); + platform_device_unregister (keydev); + platform_driver_unregister (&gpio_apu2_driver); + pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME); +} + +MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>"); +MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2"); +MODULE_LICENSE("GPL"); + +module_init (gpio_apu2_init); +module_exit (gpio_apu2_exit); |