Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 596 insertions, 0 deletions

diff --git a/drivers/leds/leds-netxbig.c b/drivers/leds/leds-netxbig.c
new file mode 100644
index 000000000..62fa0de52
--- /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");