--- /dev/null
+/*
+ * GPIO driver for NCT5104D
+ *
+ * Author: Tasanakorn Phaipool <tasanakorn@gmail.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/version.h>
+#include <linux/dmi.h>
+#include <linux/string.h>
+
+#define DRVNAME "gpio-nct5104d"
+
+/*
+ * Super-I/O registers
+ */
+#define SIO_LDSEL 0x07 /* Logical device select */
+#define SIO_CHIPID 0x20 /* Chaip ID (2 bytes) */
+#define SIO_GPIO_ENABLE 0x30 /* GPIO enable */
+#define SIO_GPIO1_MODE 0xE0 /* GPIO1 Mode OpenDrain/Push-Pull */
+#define SIO_GPIO2_MODE 0xE1 /* GPIO2 Mode OpenDrain/Push-Pull */
+
+#define SIO_LD_GPIO 0x07 /* GPIO logical device */
+#define SIO_LD_GPIO_MODE 0x0F /* GPIO mode control device */
+#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
+#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
+
+#define SIO_NCT5104D_ID 0x1061 /* Chip ID */
+#define SIO_PCENGINES_APU_NCT5104D_ID 0xc452 /* Chip ID */
+
+enum chips { nct5104d };
+
+static const char * const nct5104d_names[] = {
+ "nct5104d"
+};
+
+struct nct5104d_sio {
+ int addr;
+ enum chips type;
+};
+
+struct nct5104d_gpio_bank {
+ struct gpio_chip chip;
+ unsigned int regbase;
+ struct nct5104d_gpio_data *data;
+};
+
+struct nct5104d_gpio_data {
+ struct nct5104d_sio *sio;
+ int nr_bank;
+ struct nct5104d_gpio_bank *bank;
+};
+
+/*
+ * Super-I/O functions.
+ */
+
+static inline int superio_inb(int base, int reg)
+{
+ outb(reg, base);
+ return inb(base + 1);
+}
+
+static int superio_inw(int base, int reg)
+{
+ int val;
+
+ outb(reg++, base);
+ val = inb(base + 1) << 8;
+ outb(reg, base);
+ val |= inb(base + 1);
+
+ return val;
+}
+
+static inline void superio_outb(int base, int reg, int val)
+{
+ outb(reg, base);
+ outb(val, base + 1);
+}
+
+static inline int superio_enter(int base)
+{
+ /* Don't step on other drivers' I/O space by accident. */
+ if (!request_muxed_region(base, 2, DRVNAME)) {
+ pr_err(DRVNAME "I/O address 0x%04x already in use\n", base);
+ return -EBUSY;
+ }
+
+ /* According to the datasheet the key must be send twice. */
+ outb(SIO_UNLOCK_KEY, base);
+ outb(SIO_UNLOCK_KEY, base);
+
+ return 0;
+}
+
+static inline void superio_select(int base, int ld)
+{
+ outb(SIO_LDSEL, base);
+ outb(ld, base + 1);
+}
+
+static inline void superio_exit(int base)
+{
+ outb(SIO_LOCK_KEY, base);
+ release_region(base, 2);
+}
+
+/*
+ * GPIO chip.
+ */
+
+static int nct5104d_gpio_direction_in(struct gpio_chip *chip, unsigned offset);
+static int nct5104d_gpio_get(struct gpio_chip *chip, unsigned offset);
+static int nct5104d_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value);
+static void nct5104d_gpio_set(struct gpio_chip *chip, unsigned offset, int value);
+
+#define NCT5104D_GPIO_BANK(_base, _ngpio, _regbase) \
+ { \
+ .chip = { \
+ .label = DRVNAME, \
+ .owner = THIS_MODULE, \
+ .direction_input = nct5104d_gpio_direction_in, \
+ .get = nct5104d_gpio_get, \
+ .direction_output = nct5104d_gpio_direction_out, \
+ .set = nct5104d_gpio_set, \
+ .base = _base, \
+ .ngpio = _ngpio, \
+ .can_sleep = true, \
+ }, \
+ .regbase = _regbase, \
+ }
+
+#define gpio_dir(base) (base + 0)
+#define gpio_data(base) (base + 1)
+
+static struct nct5104d_gpio_bank nct5104d_gpio_bank[] = {
+ NCT5104D_GPIO_BANK(0 , 8, 0xE0),
+ NCT5104D_GPIO_BANK(10, 8, 0xE4)
+};
+
+static int nct5104d_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ int err;
+ struct nct5104d_gpio_bank *bank =
+ container_of(chip, struct nct5104d_gpio_bank, chip);
+ struct nct5104d_sio *sio = bank->data->sio;
+ u8 dir;
+
+ err = superio_enter(sio->addr);
+ if (err)
+ return err;
+ superio_select(sio->addr, SIO_LD_GPIO);
+
+ dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
+ dir |= (1 << offset);
+ superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
+
+ superio_exit(sio->addr);
+
+ return 0;
+}
+
+static int nct5104d_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ int err;
+ struct nct5104d_gpio_bank *bank =
+ container_of(chip, struct nct5104d_gpio_bank, chip);
+ struct nct5104d_sio *sio = bank->data->sio;
+ u8 data;
+
+ err = superio_enter(sio->addr);
+ if (err)
+ return err;
+ superio_select(sio->addr, SIO_LD_GPIO);
+
+ data = superio_inb(sio->addr, gpio_data(bank->regbase));
+
+ superio_exit(sio->addr);
+
+ return !!(data & 1 << offset);
+}
+
+static int nct5104d_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int err;
+ struct nct5104d_gpio_bank *bank =
+ container_of(chip, struct nct5104d_gpio_bank, chip);
+ struct nct5104d_sio *sio = bank->data->sio;
+ u8 dir, data_out;
+
+ err = superio_enter(sio->addr);
+ if (err)
+ return err;
+ superio_select(sio->addr, SIO_LD_GPIO);
+
+ data_out = superio_inb(sio->addr, gpio_data(bank->regbase));
+ if (value)
+ data_out |= (1 << offset);
+ else
+ data_out &= ~(1 << offset);
+ superio_outb(sio->addr, gpio_data(bank->regbase), data_out);
+
+ dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
+ dir &= ~(1 << offset);
+ superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
+
+ superio_exit(sio->addr);
+
+ return 0;
+}
+
+static void nct5104d_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ int err;
+ struct nct5104d_gpio_bank *bank =
+ container_of(chip, struct nct5104d_gpio_bank, chip);
+ struct nct5104d_sio *sio = bank->data->sio;
+ u8 data_out;
+
+ err = superio_enter(sio->addr);
+ if (err)
+ return;
+ superio_select(sio->addr, SIO_LD_GPIO);
+
+ data_out = superio_inb(sio->addr, gpio_data(bank->regbase));
+ if (value)
+ data_out |= (1 << offset);
+ else
+ data_out &= ~(1 << offset);
+ superio_outb(sio->addr, gpio_data(bank->regbase), data_out);
+
+ superio_exit(sio->addr);
+}
+
+/*
+ * Platform device and driver.
+ */
+
+static int nct5104d_gpio_probe(struct platform_device *pdev)
+{
+ int err;
+ int i;
+ struct nct5104d_sio *sio = pdev->dev.platform_data;
+ struct nct5104d_gpio_data *data;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ switch (sio->type) {
+ case nct5104d:
+ data->nr_bank = ARRAY_SIZE(nct5104d_gpio_bank);
+ data->bank = nct5104d_gpio_bank;
+ break;
+ default:
+ return -ENODEV;
+ }
+ data->sio = sio;
+
+ platform_set_drvdata(pdev, data);
+
+ /* For each GPIO bank, register a GPIO chip. */
+ for (i = 0; i < data->nr_bank; i++) {
+ struct nct5104d_gpio_bank *bank = &data->bank[i];
+
+ bank->chip.dev = &pdev->dev;
+ bank->data = data;
+
+ err = gpiochip_add(&bank->chip);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Failed to register gpiochip %d: %d\n",
+ i, err);
+ goto err_gpiochip;
+ }
+ }
+
+ return 0;
+
+err_gpiochip:
+ for (i = i - 1; i >= 0; i--) {
+ struct nct5104d_gpio_bank *bank = &data->bank[i];
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+ int rm_err = gpiochip_remove(&bank->chip);
+ if (rm_err < 0)
+ dev_err(&pdev->dev,
+ "Failed to remove gpiochip %d: %d\n",
+ i, rm_err);
+#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+ gpiochip_remove (&bank->chip);
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+ }
+
+ return err;
+}
+
+static int nct5104d_gpio_remove(struct platform_device *pdev)
+{
+ int i;
+ struct nct5104d_gpio_data *data = platform_get_drvdata(pdev);
+
+ for (i = 0; i < data->nr_bank; i++) {
+ struct nct5104d_gpio_bank *bank = &data->bank[i];
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+ int err = gpiochip_remove(&bank->chip);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Failed to remove GPIO gpiochip %d: %d\n",
+ i, err);
+ return err;
+ }
+#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+ gpiochip_remove (&bank->chip);
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+ }
+
+ return 0;
+}
+
+static int __init nct5104d_find(int addr, struct nct5104d_sio *sio)
+{
+ int err;
+ u16 devid;
+ u8 gpio_cfg;
+
+ err = superio_enter(addr);
+ if (err)
+ return err;
+
+ err = -ENODEV;
+
+ devid = superio_inw(addr, SIO_CHIPID);
+ switch (devid) {
+ case SIO_NCT5104D_ID:
+ case SIO_PCENGINES_APU_NCT5104D_ID:
+ sio->type = nct5104d;
+ /* enable GPIO0 and GPIO1 */
+ superio_select(addr, SIO_LD_GPIO);
+ gpio_cfg = superio_inb(addr, SIO_GPIO_ENABLE);
+ gpio_cfg |= 0x03;
+ superio_outb(addr, SIO_GPIO_ENABLE, gpio_cfg);
+ break;
+ default:
+ pr_info(DRVNAME ": Unsupported device 0x%04x\n", devid);
+ goto err;
+ }
+ sio->addr = addr;
+ err = 0;
+
+ pr_info(DRVNAME ": Found %s at %#x chip id 0x%04x\n",
+ nct5104d_names[sio->type],
+ (unsigned int) addr,
+ (int) superio_inw(addr, SIO_CHIPID));
+
+ superio_select(sio->addr, SIO_LD_GPIO_MODE);
+ superio_outb(sio->addr, SIO_GPIO1_MODE, 0x0);
+ superio_outb(sio->addr, SIO_GPIO2_MODE, 0x0);
+
+err:
+ superio_exit(addr);
+ return err;
+}
+
+static struct platform_device *nct5104d_gpio_pdev;
+
+static int __init
+nct5104d_gpio_device_add(const struct nct5104d_sio *sio)
+{
+ int err;
+
+ nct5104d_gpio_pdev = platform_device_alloc(DRVNAME, -1);
+ if (!nct5104d_gpio_pdev)
+ pr_err(DRVNAME ": Error platform_device_alloc\n");
+ if (!nct5104d_gpio_pdev)
+ return -ENOMEM;
+
+ err = platform_device_add_data(nct5104d_gpio_pdev,
+ sio, sizeof(*sio));
+ if (err) {
+ pr_err(DRVNAME "Platform data allocation failed\n");
+ goto err;
+ }
+
+ err = platform_device_add(nct5104d_gpio_pdev);
+ if (err) {
+ pr_err(DRVNAME "Device addition failed\n");
+ goto err;
+ }
+ pr_info(DRVNAME ": Device added\n");
+ return 0;
+
+err:
+ platform_device_put(nct5104d_gpio_pdev);
+
+ return err;
+}
+
+/*
+ */
+
+static struct platform_driver nct5104d_gpio_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRVNAME,
+ },
+ .probe = nct5104d_gpio_probe,
+ .remove = nct5104d_gpio_remove,
+};
+
+static int __init nct5104d_gpio_init(void)
+{
+ int err;
+ struct nct5104d_sio sio;
+ const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
+ const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
+
+ /* Make sure we only run on PC Engine APU boards */
+ if (!board_name || !board_vendor || strcasecmp(board_vendor, "PC Engines") || strncasecmp(board_name, "apu", 3)) {
+ return -ENODEV;
+ }
+
+ if (nct5104d_find(0x2e, &sio) &&
+ nct5104d_find(0x4e, &sio))
+ return -ENODEV;
+
+ err = platform_driver_register(&nct5104d_gpio_driver);
+ if (!err) {
+ pr_info(DRVNAME ": platform_driver_register\n");
+ err = nct5104d_gpio_device_add(&sio);
+ if (err)
+ platform_driver_unregister(&nct5104d_gpio_driver);
+ }
+
+ return err;
+}
+subsys_initcall(nct5104d_gpio_init);
+
+static void __exit nct5104d_gpio_exit(void)
+{
+ platform_device_unregister(nct5104d_gpio_pdev);
+ platform_driver_unregister(&nct5104d_gpio_driver);
+}
+module_exit(nct5104d_gpio_exit);
+
+MODULE_DESCRIPTION("GPIO driver for Super-I/O chips NCT5104D");
+MODULE_AUTHOR("Tasanakorn Phaipool <tasanakorn@gmail.com>");
+MODULE_LICENSE("GPL");
projects / openwrt / openwrt.git / blobdiff