v4.19.13 snapshot.
diff --git a/drivers/leds/leds-netxbig.c b/drivers/leds/leds-netxbig.c
new file mode 100644
index 0000000..62fa0de
--- /dev/null
+++ b/drivers/leds/leds-netxbig.c
@@ -0,0 +1,596 @@
+/*
+ * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot@lacie.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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/leds.h>
+#include <linux/platform_data/leds-kirkwood-netxbig.h>
+
+/*
+ * GPIO extension bus.
+ */
+
+static DEFINE_SPINLOCK(gpio_ext_lock);
+
+static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
+{
+ int pin;
+
+ for (pin = 0; pin < gpio_ext->num_addr; pin++)
+ gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
+}
+
+static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
+{
+ int pin;
+
+ for (pin = 0; pin < gpio_ext->num_data; pin++)
+ gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
+}
+
+static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
+{
+ /* Enable select is done on the raising edge. */
+ gpio_set_value(gpio_ext->enable, 0);
+ gpio_set_value(gpio_ext->enable, 1);
+}
+
+static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
+ int addr, int value)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_ext_lock, flags);
+ gpio_ext_set_addr(gpio_ext, addr);
+ gpio_ext_set_data(gpio_ext, value);
+ gpio_ext_enable_select(gpio_ext);
+ spin_unlock_irqrestore(&gpio_ext_lock, flags);
+}
+
+static int gpio_ext_init(struct platform_device *pdev,
+ struct netxbig_gpio_ext *gpio_ext)
+{
+ int err;
+ int i;
+
+ if (unlikely(!gpio_ext))
+ return -EINVAL;
+
+ /* Configure address GPIOs. */
+ for (i = 0; i < gpio_ext->num_addr; i++) {
+ err = devm_gpio_request_one(&pdev->dev, gpio_ext->addr[i],
+ GPIOF_OUT_INIT_LOW,
+ "GPIO extension addr");
+ if (err)
+ return err;
+ }
+ /* Configure data GPIOs. */
+ for (i = 0; i < gpio_ext->num_data; i++) {
+ err = devm_gpio_request_one(&pdev->dev, gpio_ext->data[i],
+ GPIOF_OUT_INIT_LOW,
+ "GPIO extension data");
+ if (err)
+ return err;
+ }
+ /* Configure "enable select" GPIO. */
+ err = devm_gpio_request_one(&pdev->dev, gpio_ext->enable,
+ GPIOF_OUT_INIT_LOW,
+ "GPIO extension enable");
+ if (err)
+ return err;
+
+ return 0;
+}
+
+/*
+ * Class LED driver.
+ */
+
+struct netxbig_led_data {
+ struct netxbig_gpio_ext *gpio_ext;
+ struct led_classdev cdev;
+ int mode_addr;
+ int *mode_val;
+ int bright_addr;
+ struct netxbig_led_timer *timer;
+ int num_timer;
+ enum netxbig_led_mode mode;
+ int sata;
+ spinlock_t lock;
+};
+
+static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
+ unsigned long delay_on,
+ unsigned long delay_off,
+ struct netxbig_led_timer *timer,
+ int num_timer)
+{
+ int i;
+
+ for (i = 0; i < num_timer; i++) {
+ if (timer[i].delay_on == delay_on &&
+ timer[i].delay_off == delay_off) {
+ *mode = timer[i].mode;
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+static int netxbig_led_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct netxbig_led_data *led_dat =
+ container_of(led_cdev, struct netxbig_led_data, cdev);
+ enum netxbig_led_mode mode;
+ int mode_val;
+ int ret;
+
+ /* Look for a LED mode with the requested timer frequency. */
+ ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
+ led_dat->timer, led_dat->num_timer);
+ if (ret < 0)
+ return ret;
+
+ mode_val = led_dat->mode_val[mode];
+ if (mode_val == NETXBIG_LED_INVALID_MODE)
+ return -EINVAL;
+
+ spin_lock_irq(&led_dat->lock);
+
+ gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+ led_dat->mode = mode;
+
+ spin_unlock_irq(&led_dat->lock);
+
+ return 0;
+}
+
+static void netxbig_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct netxbig_led_data *led_dat =
+ container_of(led_cdev, struct netxbig_led_data, cdev);
+ enum netxbig_led_mode mode;
+ int mode_val;
+ int set_brightness = 1;
+ unsigned long flags;
+
+ spin_lock_irqsave(&led_dat->lock, flags);
+
+ if (value == LED_OFF) {
+ mode = NETXBIG_LED_OFF;
+ set_brightness = 0;
+ } else {
+ if (led_dat->sata)
+ mode = NETXBIG_LED_SATA;
+ else if (led_dat->mode == NETXBIG_LED_OFF)
+ mode = NETXBIG_LED_ON;
+ else /* Keep 'timer' mode. */
+ mode = led_dat->mode;
+ }
+ mode_val = led_dat->mode_val[mode];
+
+ gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+ led_dat->mode = mode;
+ /*
+ * Note that the brightness register is shared between all the
+ * SATA LEDs. So, change the brightness setting for a single
+ * SATA LED will affect all the others.
+ */
+ if (set_brightness)
+ gpio_ext_set_value(led_dat->gpio_ext,
+ led_dat->bright_addr, value);
+
+ spin_unlock_irqrestore(&led_dat->lock, flags);
+}
+
+static ssize_t netxbig_led_sata_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buff, size_t count)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct netxbig_led_data *led_dat =
+ container_of(led_cdev, struct netxbig_led_data, cdev);
+ unsigned long enable;
+ enum netxbig_led_mode mode;
+ int mode_val;
+ int ret;
+
+ ret = kstrtoul(buff, 10, &enable);
+ if (ret < 0)
+ return ret;
+
+ enable = !!enable;
+
+ spin_lock_irq(&led_dat->lock);
+
+ if (led_dat->sata == enable) {
+ ret = count;
+ goto exit_unlock;
+ }
+
+ if (led_dat->mode != NETXBIG_LED_ON &&
+ led_dat->mode != NETXBIG_LED_SATA)
+ mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
+ else if (enable)
+ mode = NETXBIG_LED_SATA;
+ else
+ mode = NETXBIG_LED_ON;
+
+ mode_val = led_dat->mode_val[mode];
+ if (mode_val == NETXBIG_LED_INVALID_MODE) {
+ ret = -EINVAL;
+ goto exit_unlock;
+ }
+
+ gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+ led_dat->mode = mode;
+ led_dat->sata = enable;
+
+ ret = count;
+
+exit_unlock:
+ spin_unlock_irq(&led_dat->lock);
+
+ return ret;
+}
+
+static ssize_t netxbig_led_sata_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct netxbig_led_data *led_dat =
+ container_of(led_cdev, struct netxbig_led_data, cdev);
+
+ return sprintf(buf, "%d\n", led_dat->sata);
+}
+
+static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
+
+static struct attribute *netxbig_led_attrs[] = {
+ &dev_attr_sata.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(netxbig_led);
+
+static int create_netxbig_led(struct platform_device *pdev,
+ struct netxbig_led_platform_data *pdata,
+ struct netxbig_led_data *led_dat,
+ const struct netxbig_led *template)
+{
+ spin_lock_init(&led_dat->lock);
+ led_dat->gpio_ext = pdata->gpio_ext;
+ led_dat->cdev.name = template->name;
+ led_dat->cdev.default_trigger = template->default_trigger;
+ led_dat->cdev.blink_set = netxbig_led_blink_set;
+ led_dat->cdev.brightness_set = netxbig_led_set;
+ /*
+ * Because the GPIO extension bus don't allow to read registers
+ * value, there is no way to probe the LED initial state.
+ * So, the initial sysfs LED value for the "brightness" and "sata"
+ * attributes are inconsistent.
+ *
+ * Note that the initial LED state can't be reconfigured.
+ * The reason is that the LED behaviour must stay uniform during
+ * the whole boot process (bootloader+linux).
+ */
+ led_dat->sata = 0;
+ led_dat->cdev.brightness = LED_OFF;
+ led_dat->cdev.max_brightness = template->bright_max;
+ led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+ led_dat->mode_addr = template->mode_addr;
+ led_dat->mode_val = template->mode_val;
+ led_dat->bright_addr = template->bright_addr;
+ led_dat->timer = pdata->timer;
+ led_dat->num_timer = pdata->num_timer;
+ /*
+ * If available, expose the SATA activity blink capability through
+ * a "sata" sysfs attribute.
+ */
+ if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
+ led_dat->cdev.groups = netxbig_led_groups;
+
+ return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
+}
+
+#ifdef CONFIG_OF_GPIO
+static int gpio_ext_get_of_pdata(struct device *dev, struct device_node *np,
+ struct netxbig_gpio_ext *gpio_ext)
+{
+ int *addr, *data;
+ int num_addr, num_data;
+ int ret;
+ int i;
+
+ ret = of_gpio_named_count(np, "addr-gpios");
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to count GPIOs in DT property addr-gpios\n");
+ return ret;
+ }
+ num_addr = ret;
+ addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+
+ for (i = 0; i < num_addr; i++) {
+ ret = of_get_named_gpio(np, "addr-gpios", i);
+ if (ret < 0)
+ return ret;
+ addr[i] = ret;
+ }
+ gpio_ext->addr = addr;
+ gpio_ext->num_addr = num_addr;
+
+ ret = of_gpio_named_count(np, "data-gpios");
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to count GPIOs in DT property data-gpios\n");
+ return ret;
+ }
+ num_data = ret;
+ data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ for (i = 0; i < num_data; i++) {
+ ret = of_get_named_gpio(np, "data-gpios", i);
+ if (ret < 0)
+ return ret;
+ data[i] = ret;
+ }
+ gpio_ext->data = data;
+ gpio_ext->num_data = num_data;
+
+ ret = of_get_named_gpio(np, "enable-gpio", 0);
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to get GPIO from DT property enable-gpio\n");
+ return ret;
+ }
+ gpio_ext->enable = ret;
+
+ return 0;
+}
+
+static int netxbig_leds_get_of_pdata(struct device *dev,
+ struct netxbig_led_platform_data *pdata)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *gpio_ext_np;
+ struct device_node *child;
+ struct netxbig_gpio_ext *gpio_ext;
+ struct netxbig_led_timer *timers;
+ struct netxbig_led *leds, *led;
+ int num_timers;
+ int num_leds = 0;
+ int ret;
+ int i;
+
+ /* GPIO extension */
+ gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
+ if (!gpio_ext_np) {
+ dev_err(dev, "Failed to get DT handle gpio-ext\n");
+ return -EINVAL;
+ }
+
+ gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
+ if (!gpio_ext)
+ return -ENOMEM;
+ ret = gpio_ext_get_of_pdata(dev, gpio_ext_np, gpio_ext);
+ if (ret)
+ return ret;
+ of_node_put(gpio_ext_np);
+ pdata->gpio_ext = gpio_ext;
+
+ /* Timers (optional) */
+ ret = of_property_count_u32_elems(np, "timers");
+ if (ret > 0) {
+ if (ret % 3)
+ return -EINVAL;
+ num_timers = ret / 3;
+ timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
+ GFP_KERNEL);
+ if (!timers)
+ return -ENOMEM;
+ for (i = 0; i < num_timers; i++) {
+ u32 tmp;
+
+ of_property_read_u32_index(np, "timers", 3 * i,
+ &timers[i].mode);
+ if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
+ return -EINVAL;
+ of_property_read_u32_index(np, "timers",
+ 3 * i + 1, &tmp);
+ timers[i].delay_on = tmp;
+ of_property_read_u32_index(np, "timers",
+ 3 * i + 2, &tmp);
+ timers[i].delay_off = tmp;
+ }
+ pdata->timer = timers;
+ pdata->num_timer = num_timers;
+ }
+
+ /* LEDs */
+ num_leds = of_get_child_count(np);
+ if (!num_leds) {
+ dev_err(dev, "No LED subnodes found in DT\n");
+ return -ENODEV;
+ }
+
+ leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ led = leds;
+ for_each_child_of_node(np, child) {
+ const char *string;
+ int *mode_val;
+ int num_modes;
+
+ ret = of_property_read_u32(child, "mode-addr",
+ &led->mode_addr);
+ if (ret)
+ goto err_node_put;
+
+ ret = of_property_read_u32(child, "bright-addr",
+ &led->bright_addr);
+ if (ret)
+ goto err_node_put;
+
+ ret = of_property_read_u32(child, "max-brightness",
+ &led->bright_max);
+ if (ret)
+ goto err_node_put;
+
+ mode_val =
+ devm_kcalloc(dev,
+ NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
+ GFP_KERNEL);
+ if (!mode_val) {
+ ret = -ENOMEM;
+ goto err_node_put;
+ }
+
+ for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
+ mode_val[i] = NETXBIG_LED_INVALID_MODE;
+
+ ret = of_property_count_u32_elems(child, "mode-val");
+ if (ret < 0 || ret % 2) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+ num_modes = ret / 2;
+ if (num_modes > NETXBIG_LED_MODE_NUM) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+
+ for (i = 0; i < num_modes; i++) {
+ int mode;
+ int val;
+
+ of_property_read_u32_index(child,
+ "mode-val", 2 * i, &mode);
+ of_property_read_u32_index(child,
+ "mode-val", 2 * i + 1, &val);
+ if (mode >= NETXBIG_LED_MODE_NUM) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+ mode_val[mode] = val;
+ }
+ led->mode_val = mode_val;
+
+ if (!of_property_read_string(child, "label", &string))
+ led->name = string;
+ else
+ led->name = child->name;
+
+ if (!of_property_read_string(child,
+ "linux,default-trigger", &string))
+ led->default_trigger = string;
+
+ led++;
+ }
+
+ pdata->leds = leds;
+ pdata->num_leds = num_leds;
+
+ return 0;
+
+err_node_put:
+ of_node_put(child);
+ return ret;
+}
+
+static const struct of_device_id of_netxbig_leds_match[] = {
+ { .compatible = "lacie,netxbig-leds", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);
+#else
+static inline int
+netxbig_leds_get_of_pdata(struct device *dev,
+ struct netxbig_led_platform_data *pdata)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_OF_GPIO */
+
+static int netxbig_led_probe(struct platform_device *pdev)
+{
+ struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct netxbig_led_data *leds_data;
+ int i;
+ int ret;
+
+ if (!pdata) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
+ if (ret)
+ return ret;
+ }
+
+ leds_data = devm_kcalloc(&pdev->dev,
+ pdata->num_leds, sizeof(*leds_data),
+ GFP_KERNEL);
+ if (!leds_data)
+ return -ENOMEM;
+
+ ret = gpio_ext_init(pdev, pdata->gpio_ext);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ ret = create_netxbig_led(pdev, pdata,
+ &leds_data[i], &pdata->leds[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct platform_driver netxbig_led_driver = {
+ .probe = netxbig_led_probe,
+ .driver = {
+ .name = "leds-netxbig",
+ .of_match_table = of_match_ptr(of_netxbig_leds_match),
+ },
+};
+
+module_platform_driver(netxbig_led_driver);
+
+MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
+MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-netxbig");