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Date: Fri, 16 Sep 2016 16:10:14 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Cc: Johan Hovold <johan@...oldconsulting.com>,
Rui Miguel Silva <rmfrfs@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Sandeep Patil <sspatil@...gle.com>,
Matt Porter <mporter@...nel.crashing.org>,
John Stultz <john.stultz@...aro.org>,
Rob Herring <robh@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Alex Elder <elder@...aro.org>, David Lin <dtwlin@...gle.com>,
Bryan O'Donoghue <pure.logic@...us-software.ie>,
Vaibhav Agarwal <vaibhav.agarwal@...aro.org>,
Mark Greer <mgreer@...malcreek.com>
Subject: [patch 14/32] greybus: LED driver
This driver implements the Greybus LED protocol.
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/greybus/light.c | 1359 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1359 insertions(+)
--- /dev/null
+++ b/drivers/greybus/light.c
@@ -0,0 +1,1359 @@
+/*
+ * Greybus Lights protocol driver.
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <media/v4l2-flash-led-class.h>
+
+#include "greybus.h"
+#include "greybus_protocols.h"
+
+#define NAMES_MAX 32
+
+struct gb_channel {
+ u8 id;
+ u32 flags;
+ u32 color;
+ char *color_name;
+ u8 fade_in;
+ u8 fade_out;
+ u32 mode;
+ char *mode_name;
+ struct attribute **attrs;
+ struct attribute_group *attr_group;
+ const struct attribute_group **attr_groups;
+ struct led_classdev *led;
+#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
+ struct led_classdev_flash fled;
+ struct led_flash_setting intensity_uA;
+ struct led_flash_setting timeout_us;
+#else
+ struct led_classdev cled;
+#endif
+ struct gb_light *light;
+ bool is_registered;
+ bool releasing;
+ bool strobe_state;
+ bool active;
+ struct mutex lock;
+};
+
+struct gb_light {
+ u8 id;
+ char *name;
+ struct gb_lights *glights;
+ u32 flags;
+ u8 channels_count;
+ struct gb_channel *channels;
+ bool has_flash;
+ bool ready;
+#if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
+ struct v4l2_flash *v4l2_flash;
+#endif
+};
+
+struct gb_lights {
+ struct gb_connection *connection;
+ u8 lights_count;
+ struct gb_light *lights;
+ struct mutex lights_lock;
+};
+
+static void gb_lights_channel_free(struct gb_channel *channel);
+
+static struct gb_connection *get_conn_from_channel(struct gb_channel *channel)
+{
+ return channel->light->glights->connection;
+}
+
+static struct gb_connection *get_conn_from_light(struct gb_light *light)
+{
+ return light->glights->connection;
+}
+
+static bool is_channel_flash(struct gb_channel *channel)
+{
+ return !!(channel->mode & (GB_CHANNEL_MODE_FLASH | GB_CHANNEL_MODE_TORCH
+ | GB_CHANNEL_MODE_INDICATOR));
+}
+
+#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
+static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
+
+ return container_of(fled_cdev, struct gb_channel, fled);
+}
+
+static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
+{
+ return &channel->fled.led_cdev;
+}
+
+static struct gb_channel *get_channel_from_mode(struct gb_light *light,
+ u32 mode)
+{
+ struct gb_channel *channel = NULL;
+ int i;
+
+ for (i = 0; i < light->channels_count; i++) {
+ channel = &light->channels[i];
+ if (channel && channel->mode == mode)
+ break;
+ }
+ return channel;
+}
+
+static int __gb_lights_flash_intensity_set(struct gb_channel *channel,
+ u32 intensity)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_set_flash_intensity_request req;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.intensity_uA = cpu_to_le32(intensity);
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_INTENSITY,
+ &req, sizeof(req), NULL, 0);
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
+{
+ u32 intensity;
+
+ /* If the channel is flash we need to get the attached torch channel */
+ if (channel->mode & GB_CHANNEL_MODE_FLASH)
+ channel = get_channel_from_mode(channel->light,
+ GB_CHANNEL_MODE_TORCH);
+
+ /* For not flash we need to convert brightness to intensity */
+ intensity = channel->intensity_uA.min +
+ (channel->intensity_uA.step * channel->led->brightness);
+
+ return __gb_lights_flash_intensity_set(channel, intensity);
+}
+#else
+static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
+{
+ return container_of(cdev, struct gb_channel, cled);
+}
+
+static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
+{
+ return &channel->cled;
+}
+
+static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
+{
+ return 0;
+}
+#endif
+
+static int gb_lights_color_set(struct gb_channel *channel, u32 color);
+static int gb_lights_fade_set(struct gb_channel *channel);
+
+static void led_lock(struct led_classdev *cdev)
+{
+ mutex_lock(&cdev->led_access);
+}
+
+static void led_unlock(struct led_classdev *cdev)
+{
+ mutex_unlock(&cdev->led_access);
+}
+
+#define gb_lights_fade_attr(__dir) \
+static ssize_t fade_##__dir##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct led_classdev *cdev = dev_get_drvdata(dev); \
+ struct gb_channel *channel = get_channel_from_cdev(cdev); \
+ \
+ return sprintf(buf, "%u\n", channel->fade_##__dir); \
+} \
+ \
+static ssize_t fade_##__dir##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t size) \
+{ \
+ struct led_classdev *cdev = dev_get_drvdata(dev); \
+ struct gb_channel *channel = get_channel_from_cdev(cdev); \
+ u8 fade; \
+ int ret; \
+ \
+ led_lock(cdev); \
+ if (led_sysfs_is_disabled(cdev)) { \
+ ret = -EBUSY; \
+ goto unlock; \
+ } \
+ \
+ ret = kstrtou8(buf, 0, &fade); \
+ if (ret < 0) { \
+ dev_err(dev, "could not parse fade value %d\n", ret); \
+ goto unlock; \
+ } \
+ if (channel->fade_##__dir == fade) \
+ goto unlock; \
+ channel->fade_##__dir = fade; \
+ \
+ ret = gb_lights_fade_set(channel); \
+ if (ret < 0) \
+ goto unlock; \
+ \
+ ret = size; \
+unlock: \
+ led_unlock(cdev); \
+ return ret; \
+} \
+static DEVICE_ATTR_RW(fade_##__dir)
+
+gb_lights_fade_attr(in);
+gb_lights_fade_attr(out);
+
+static ssize_t color_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *cdev = dev_get_drvdata(dev);
+ struct gb_channel *channel = get_channel_from_cdev(cdev);
+
+ return sprintf(buf, "0x%08x\n", channel->color);
+}
+
+static ssize_t color_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct led_classdev *cdev = dev_get_drvdata(dev);
+ struct gb_channel *channel = get_channel_from_cdev(cdev);
+ u32 color;
+ int ret;
+
+ led_lock(cdev);
+ if (led_sysfs_is_disabled(cdev)) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+ ret = kstrtou32(buf, 0, &color);
+ if (ret < 0) {
+ dev_err(dev, "could not parse color value %d\n", ret);
+ goto unlock;
+ }
+
+ ret = gb_lights_color_set(channel, color);
+ if (ret < 0)
+ goto unlock;
+
+ channel->color = color;
+ ret = size;
+unlock:
+ led_unlock(cdev);
+ return ret;
+}
+static DEVICE_ATTR_RW(color);
+
+static int channel_attr_groups_set(struct gb_channel *channel,
+ struct led_classdev *cdev)
+{
+ int attr = 0;
+ int size = 0;
+
+ if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
+ size++;
+ if (channel->flags & GB_LIGHT_CHANNEL_FADER)
+ size += 2;
+
+ if (!size)
+ return 0;
+
+ /* Set attributes based in the channel flags */
+ channel->attrs = kcalloc(size + 1, sizeof(**channel->attrs),
+ GFP_KERNEL);
+ if (!channel->attrs)
+ return -ENOMEM;
+ channel->attr_group = kcalloc(1, sizeof(*channel->attr_group),
+ GFP_KERNEL);
+ if (!channel->attr_group)
+ return -ENOMEM;
+ channel->attr_groups = kcalloc(2, sizeof(*channel->attr_groups),
+ GFP_KERNEL);
+ if (!channel->attr_groups)
+ return -ENOMEM;
+
+ if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
+ channel->attrs[attr++] = &dev_attr_color.attr;
+ if (channel->flags & GB_LIGHT_CHANNEL_FADER) {
+ channel->attrs[attr++] = &dev_attr_fade_in.attr;
+ channel->attrs[attr++] = &dev_attr_fade_out.attr;
+ }
+
+ channel->attr_group->attrs = channel->attrs;
+
+ channel->attr_groups[0] = channel->attr_group;
+
+ cdev->groups = channel->attr_groups;
+
+ return 0;
+}
+
+static int gb_lights_fade_set(struct gb_channel *channel)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_set_fade_request req;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.fade_in = channel->fade_in;
+ req.fade_out = channel->fade_out;
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FADE,
+ &req, sizeof(req), NULL, 0);
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static int gb_lights_color_set(struct gb_channel *channel, u32 color)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_set_color_request req;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.color = cpu_to_le32(color);
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_COLOR,
+ &req, sizeof(req), NULL, 0);
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static int __gb_lights_led_brightness_set(struct gb_channel *channel)
+{
+ struct gb_lights_set_brightness_request req;
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ bool old_active;
+ int ret;
+
+ mutex_lock(&channel->lock);
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ goto out_unlock;
+
+ old_active = channel->active;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.brightness = (u8)channel->led->brightness;
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BRIGHTNESS,
+ &req, sizeof(req), NULL, 0);
+ if (ret < 0)
+ goto out_pm_put;
+
+ if (channel->led->brightness)
+ channel->active = true;
+ else
+ channel->active = false;
+
+ /* we need to keep module alive when turning to active state */
+ if (!old_active && channel->active)
+ goto out_unlock;
+
+ /*
+ * on the other hand if going to inactive we still hold a reference and
+ * need to put it, so we could go to suspend.
+ */
+ if (old_active && !channel->active)
+ gb_pm_runtime_put_autosuspend(bundle);
+
+out_pm_put:
+ gb_pm_runtime_put_autosuspend(bundle);
+out_unlock:
+ mutex_unlock(&channel->lock);
+
+ return ret;
+}
+
+static int __gb_lights_brightness_set(struct gb_channel *channel)
+{
+ int ret;
+
+ if (channel->releasing)
+ return 0;
+
+ if (is_channel_flash(channel))
+ ret = __gb_lights_flash_brightness_set(channel);
+ else
+ ret = __gb_lights_led_brightness_set(channel);
+
+ return ret;
+}
+
+static int gb_brightness_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct gb_channel *channel = get_channel_from_cdev(cdev);
+
+ channel->led->brightness = value;
+
+ return __gb_lights_brightness_set(channel);
+}
+
+static enum led_brightness gb_brightness_get(struct led_classdev *cdev)
+
+{
+ struct gb_channel *channel = get_channel_from_cdev(cdev);
+
+ return channel->led->brightness;
+}
+
+static int gb_blink_set(struct led_classdev *cdev, unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct gb_channel *channel = get_channel_from_cdev(cdev);
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_blink_request req;
+ bool old_active;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ mutex_lock(&channel->lock);
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ goto out_unlock;
+
+ old_active = channel->active;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.time_on_ms = cpu_to_le16(*delay_on);
+ req.time_off_ms = cpu_to_le16(*delay_off);
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BLINK, &req,
+ sizeof(req), NULL, 0);
+ if (ret < 0)
+ goto out_pm_put;
+
+ if (delay_on)
+ channel->active = true;
+ else
+ channel->active = false;
+
+ /* we need to keep module alive when turning to active state */
+ if (!old_active && channel->active)
+ goto out_unlock;
+
+ /*
+ * on the other hand if going to inactive we still hold a reference and
+ * need to put it, so we could go to suspend.
+ */
+ if (old_active && !channel->active)
+ gb_pm_runtime_put_autosuspend(bundle);
+
+out_pm_put:
+ gb_pm_runtime_put_autosuspend(bundle);
+out_unlock:
+ mutex_unlock(&channel->lock);
+
+ return ret;
+}
+
+static void gb_lights_led_operations_set(struct gb_channel *channel,
+ struct led_classdev *cdev)
+{
+ cdev->brightness_get = gb_brightness_get;
+ cdev->brightness_set_blocking = gb_brightness_set;
+
+ if (channel->flags & GB_LIGHT_CHANNEL_BLINK)
+ cdev->blink_set = gb_blink_set;
+}
+
+#if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
+/* V4L2 specific helpers */
+static const struct v4l2_flash_ops v4l2_flash_ops;
+
+static void __gb_lights_channel_v4l2_config(struct led_flash_setting *channel_s,
+ struct led_flash_setting *v4l2_s)
+{
+ v4l2_s->min = channel_s->min;
+ v4l2_s->max = channel_s->max;
+ v4l2_s->step = channel_s->step;
+ /* For v4l2 val is the default value */
+ v4l2_s->val = channel_s->max;
+}
+
+static int gb_lights_light_v4l2_register(struct gb_light *light)
+{
+ struct gb_connection *connection = get_conn_from_light(light);
+ struct device *dev = &connection->bundle->dev;
+ struct v4l2_flash_config *sd_cfg;
+ struct led_classdev_flash *fled;
+ struct led_classdev_flash *iled = NULL;
+ struct gb_channel *channel_torch, *channel_ind, *channel_flash;
+ int ret = 0;
+
+ sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
+ if (!sd_cfg)
+ return -ENOMEM;
+
+ channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
+ if (channel_torch)
+ __gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
+ &sd_cfg->torch_intensity);
+
+ channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
+ if (channel_ind) {
+ __gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
+ &sd_cfg->indicator_intensity);
+ iled = &channel_ind->fled;
+ }
+
+ channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH);
+ WARN_ON(!channel_flash);
+
+ fled = &channel_flash->fled;
+
+ snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
+
+ /* Set the possible values to faults, in our case all faults */
+ sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
+ LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
+ LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
+ LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
+ LED_FAULT_LED_OVER_TEMPERATURE;
+
+ light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
+ &v4l2_flash_ops, sd_cfg);
+ if (IS_ERR_OR_NULL(light->v4l2_flash)) {
+ ret = PTR_ERR(light->v4l2_flash);
+ goto out_free;
+ }
+
+ return ret;
+
+out_free:
+ kfree(sd_cfg);
+ return ret;
+}
+
+static void gb_lights_light_v4l2_unregister(struct gb_light *light)
+{
+ v4l2_flash_release(light->v4l2_flash);
+}
+#else
+static int gb_lights_light_v4l2_register(struct gb_light *light)
+{
+ struct gb_connection *connection = get_conn_from_light(light);
+
+ dev_err(&connection->bundle->dev, "no support for v4l2 subdevices\n");
+ return 0;
+}
+
+static void gb_lights_light_v4l2_unregister(struct gb_light *light)
+{
+}
+#endif
+
+#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
+/* Flash specific operations */
+static int gb_lights_flash_intensity_set(struct led_classdev_flash *fcdev,
+ u32 brightness)
+{
+ struct gb_channel *channel = container_of(fcdev, struct gb_channel,
+ fled);
+ int ret;
+
+ ret = __gb_lights_flash_intensity_set(channel, brightness);
+ if (ret < 0)
+ return ret;
+
+ fcdev->brightness.val = brightness;
+
+ return 0;
+}
+
+static int gb_lights_flash_intensity_get(struct led_classdev_flash *fcdev,
+ u32 *brightness)
+{
+ *brightness = fcdev->brightness.val;
+
+ return 0;
+}
+
+static int gb_lights_flash_strobe_set(struct led_classdev_flash *fcdev,
+ bool state)
+{
+ struct gb_channel *channel = container_of(fcdev, struct gb_channel,
+ fled);
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_set_flash_strobe_request req;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.state = state ? 1 : 0;
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_STROBE,
+ &req, sizeof(req), NULL, 0);
+ if (!ret)
+ channel->strobe_state = state;
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static int gb_lights_flash_strobe_get(struct led_classdev_flash *fcdev,
+ bool *state)
+{
+ struct gb_channel *channel = container_of(fcdev, struct gb_channel,
+ fled);
+
+ *state = channel->strobe_state;
+ return 0;
+}
+
+static int gb_lights_flash_timeout_set(struct led_classdev_flash *fcdev,
+ u32 timeout)
+{
+ struct gb_channel *channel = container_of(fcdev, struct gb_channel,
+ fled);
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_set_flash_timeout_request req;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+ req.timeout_us = cpu_to_le32(timeout);
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_TIMEOUT,
+ &req, sizeof(req), NULL, 0);
+ if (!ret)
+ fcdev->timeout.val = timeout;
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static int gb_lights_flash_fault_get(struct led_classdev_flash *fcdev,
+ u32 *fault)
+{
+ struct gb_channel *channel = container_of(fcdev, struct gb_channel,
+ fled);
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_bundle *bundle = connection->bundle;
+ struct gb_lights_get_flash_fault_request req;
+ struct gb_lights_get_flash_fault_response resp;
+ int ret;
+
+ if (channel->releasing)
+ return -ESHUTDOWN;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ return ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_FLASH_FAULT,
+ &req, sizeof(req), &resp, sizeof(resp));
+ if (!ret)
+ *fault = le32_to_cpu(resp.fault);
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return ret;
+}
+
+static const struct led_flash_ops gb_lights_flash_ops = {
+ .flash_brightness_set = gb_lights_flash_intensity_set,
+ .flash_brightness_get = gb_lights_flash_intensity_get,
+ .strobe_set = gb_lights_flash_strobe_set,
+ .strobe_get = gb_lights_flash_strobe_get,
+ .timeout_set = gb_lights_flash_timeout_set,
+ .fault_get = gb_lights_flash_fault_get,
+};
+
+static int __gb_lights_channel_torch_attach(struct gb_channel *channel,
+ struct gb_channel *channel_torch)
+{
+ char *name;
+
+ /* we can only attach torch to a flash channel */
+ if (!(channel->mode & GB_CHANNEL_MODE_FLASH))
+ return 0;
+
+ /* Move torch brightness to the destination */
+ channel->led->max_brightness = channel_torch->led->max_brightness;
+
+ /* append mode name to flash name */
+ name = kasprintf(GFP_KERNEL, "%s_%s", channel->led->name,
+ channel_torch->mode_name);
+ if (!name)
+ return -ENOMEM;
+ kfree(channel->led->name);
+ channel->led->name = name;
+
+ channel_torch->led = channel->led;
+
+ return 0;
+}
+
+static int __gb_lights_flash_led_register(struct gb_channel *channel)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct led_classdev_flash *fled = &channel->fled;
+ struct led_flash_setting *fset;
+ struct gb_channel *channel_torch;
+ int ret;
+
+ fled->ops = &gb_lights_flash_ops;
+
+ fled->led_cdev.flags |= LED_DEV_CAP_FLASH;
+
+ fset = &fled->brightness;
+ fset->min = channel->intensity_uA.min;
+ fset->max = channel->intensity_uA.max;
+ fset->step = channel->intensity_uA.step;
+ fset->val = channel->intensity_uA.max;
+
+ /* Only the flash mode have the timeout constraints settings */
+ if (channel->mode & GB_CHANNEL_MODE_FLASH) {
+ fset = &fled->timeout;
+ fset->min = channel->timeout_us.min;
+ fset->max = channel->timeout_us.max;
+ fset->step = channel->timeout_us.step;
+ fset->val = channel->timeout_us.max;
+ }
+
+ /*
+ * If light have torch mode channel, this channel will be the led
+ * classdev of the registered above flash classdev
+ */
+ channel_torch = get_channel_from_mode(channel->light,
+ GB_CHANNEL_MODE_TORCH);
+ if (channel_torch) {
+ ret = __gb_lights_channel_torch_attach(channel, channel_torch);
+ if (ret < 0)
+ goto fail;
+ }
+
+ ret = led_classdev_flash_register(&connection->bundle->dev, fled);
+ if (ret < 0)
+ goto fail;
+
+ channel->is_registered = true;
+ return 0;
+fail:
+ channel->led = NULL;
+ return ret;
+}
+
+static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
+{
+ if (!channel->is_registered)
+ return;
+
+ led_classdev_flash_unregister(&channel->fled);
+}
+
+static int gb_lights_channel_flash_config(struct gb_channel *channel)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct gb_lights_get_channel_flash_config_request req;
+ struct gb_lights_get_channel_flash_config_response conf;
+ struct led_flash_setting *fset;
+ int ret;
+
+ req.light_id = channel->light->id;
+ req.channel_id = channel->id;
+
+ ret = gb_operation_sync(connection,
+ GB_LIGHTS_TYPE_GET_CHANNEL_FLASH_CONFIG,
+ &req, sizeof(req), &conf, sizeof(conf));
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Intensity constraints for flash related modes: flash, torch,
+ * indicator. They will be needed for v4l2 registration.
+ */
+ fset = &channel->intensity_uA;
+ fset->min = le32_to_cpu(conf.intensity_min_uA);
+ fset->max = le32_to_cpu(conf.intensity_max_uA);
+ fset->step = le32_to_cpu(conf.intensity_step_uA);
+
+ /*
+ * On flash type, max brightness is set as the number of intensity steps
+ * available.
+ */
+ channel->led->max_brightness = (fset->max - fset->min) / fset->step;
+
+ /* Only the flash mode have the timeout constraints settings */
+ if (channel->mode & GB_CHANNEL_MODE_FLASH) {
+ fset = &channel->timeout_us;
+ fset->min = le32_to_cpu(conf.timeout_min_us);
+ fset->max = le32_to_cpu(conf.timeout_max_us);
+ fset->step = le32_to_cpu(conf.timeout_step_us);
+ }
+
+ return 0;
+}
+#else
+static int gb_lights_channel_flash_config(struct gb_channel *channel)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+
+ dev_err(&connection->bundle->dev, "no support for flash devices\n");
+ return 0;
+}
+
+static int __gb_lights_flash_led_register(struct gb_channel *channel)
+{
+ return 0;
+}
+
+static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
+{
+}
+
+#endif
+
+static int __gb_lights_led_register(struct gb_channel *channel)
+{
+ struct gb_connection *connection = get_conn_from_channel(channel);
+ struct led_classdev *cdev = get_channel_cdev(channel);
+ int ret;
+
+ ret = led_classdev_register(&connection->bundle->dev, cdev);
+ if (ret < 0)
+ channel->led = NULL;
+ else
+ channel->is_registered = true;
+ return ret;
+}
+
+static int gb_lights_channel_register(struct gb_channel *channel)
+{
+ /* Normal LED channel, just register in led classdev and we are done */
+ if (!is_channel_flash(channel))
+ return __gb_lights_led_register(channel);
+
+ /*
+ * Flash Type need more work, register flash classdev, indicator as
+ * flash classdev, torch will be led classdev of the flash classdev.
+ */
+ if (!(channel->mode & GB_CHANNEL_MODE_TORCH))
+ return __gb_lights_flash_led_register(channel);
+
+ return 0;
+}
+
+static void __gb_lights_led_unregister(struct gb_channel *channel)
+{
+ struct led_classdev *cdev = get_channel_cdev(channel);
+
+ if (!channel->is_registered)
+ return;
+
+ led_classdev_unregister(cdev);
+ channel->led = NULL;
+}
+
+static void gb_lights_channel_unregister(struct gb_channel *channel)
+{
+ /* The same as register, handle channels differently */
+ if (!is_channel_flash(channel)) {
+ __gb_lights_led_unregister(channel);
+ return;
+ }
+
+ if (channel->mode & GB_CHANNEL_MODE_TORCH)
+ __gb_lights_led_unregister(channel);
+ else
+ __gb_lights_flash_led_unregister(channel);
+}
+
+static int gb_lights_channel_config(struct gb_light *light,
+ struct gb_channel *channel)
+{
+ struct gb_lights_get_channel_config_response conf;
+ struct gb_lights_get_channel_config_request req;
+ struct gb_connection *connection = get_conn_from_light(light);
+ struct led_classdev *cdev = get_channel_cdev(channel);
+ char *name;
+ int ret;
+
+ req.light_id = light->id;
+ req.channel_id = channel->id;
+
+ ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_CHANNEL_CONFIG,
+ &req, sizeof(req), &conf, sizeof(conf));
+ if (ret < 0)
+ return ret;
+
+ channel->light = light;
+ channel->mode = le32_to_cpu(conf.mode);
+ channel->flags = le32_to_cpu(conf.flags);
+ channel->color = le32_to_cpu(conf.color);
+ channel->color_name = kstrndup(conf.color_name, NAMES_MAX, GFP_KERNEL);
+ if (!channel->color_name)
+ return -ENOMEM;
+ channel->mode_name = kstrndup(conf.mode_name, NAMES_MAX, GFP_KERNEL);
+ if (!channel->mode_name)
+ return -ENOMEM;
+
+ channel->led = cdev;
+
+ name = kasprintf(GFP_KERNEL, "%s:%s:%s", light->name,
+ channel->color_name, channel->mode_name);
+ if (!name)
+ return -ENOMEM;
+
+ cdev->name = name;
+
+ cdev->max_brightness = conf.max_brightness;
+
+ ret = channel_attr_groups_set(channel, cdev);
+ if (ret < 0)
+ return ret;
+
+ gb_lights_led_operations_set(channel, cdev);
+
+ /*
+ * If it is not a flash related channel (flash, torch or indicator) we
+ * are done here. If not, continue and fetch flash related
+ * configurations.
+ */
+ if (!is_channel_flash(channel))
+ return ret;
+
+ light->has_flash = true;
+
+ ret = gb_lights_channel_flash_config(channel);
+ if (ret < 0)
+ return ret;
+
+ return ret;
+}
+
+static int gb_lights_light_config(struct gb_lights *glights, u8 id)
+{
+ struct gb_light *light = &glights->lights[id];
+ struct gb_lights_get_light_config_request req;
+ struct gb_lights_get_light_config_response conf;
+ int ret;
+ int i;
+
+ light->glights = glights;
+ light->id = id;
+
+ req.id = id;
+
+ ret = gb_operation_sync(glights->connection,
+ GB_LIGHTS_TYPE_GET_LIGHT_CONFIG,
+ &req, sizeof(req), &conf, sizeof(conf));
+ if (ret < 0)
+ return ret;
+
+ if (!conf.channel_count)
+ return -EINVAL;
+ if (!strlen(conf.name))
+ return -EINVAL;
+
+ light->channels_count = conf.channel_count;
+ light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL);
+
+ light->channels = kzalloc(light->channels_count *
+ sizeof(struct gb_channel), GFP_KERNEL);
+ if (!light->channels)
+ return -ENOMEM;
+
+ /* First we collect all the configurations for all channels */
+ for (i = 0; i < light->channels_count; i++) {
+ light->channels[i].id = i;
+ ret = gb_lights_channel_config(light, &light->channels[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gb_lights_light_register(struct gb_light *light)
+{
+ int ret;
+ int i;
+
+ /*
+ * Then, if everything went ok in getting configurations, we register
+ * the classdev, flash classdev and v4l2 subsystem, if a flash device is
+ * found.
+ */
+ for (i = 0; i < light->channels_count; i++) {
+ ret = gb_lights_channel_register(&light->channels[i]);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&light->channels[i].lock);
+ }
+
+ light->ready = true;
+
+ if (light->has_flash) {
+ ret = gb_lights_light_v4l2_register(light);
+ if (ret < 0) {
+ light->has_flash = false;
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void gb_lights_channel_free(struct gb_channel *channel)
+{
+ kfree(channel->attrs);
+ kfree(channel->attr_group);
+ kfree(channel->attr_groups);
+ kfree(channel->color_name);
+ kfree(channel->mode_name);
+ mutex_destroy(&channel->lock);
+}
+
+static void gb_lights_channel_release(struct gb_channel *channel)
+{
+ channel->releasing = true;
+
+ gb_lights_channel_unregister(channel);
+
+ gb_lights_channel_free(channel);
+}
+
+static void gb_lights_light_release(struct gb_light *light)
+{
+ int i;
+ int count;
+
+ light->ready = false;
+
+ count = light->channels_count;
+
+ if (light->has_flash)
+ gb_lights_light_v4l2_unregister(light);
+
+ for (i = 0; i < count; i++) {
+ gb_lights_channel_release(&light->channels[i]);
+ light->channels_count--;
+ }
+ kfree(light->channels);
+ kfree(light->name);
+}
+
+static void gb_lights_release(struct gb_lights *glights)
+{
+ int i;
+
+ if (!glights)
+ return;
+
+ mutex_lock(&glights->lights_lock);
+ if (!glights->lights)
+ goto free_glights;
+
+ for (i = 0; i < glights->lights_count; i++)
+ gb_lights_light_release(&glights->lights[i]);
+
+ kfree(glights->lights);
+
+free_glights:
+ mutex_unlock(&glights->lights_lock);
+ mutex_destroy(&glights->lights_lock);
+ kfree(glights);
+}
+
+static int gb_lights_get_count(struct gb_lights *glights)
+{
+ struct gb_lights_get_lights_response resp;
+ int ret;
+
+ ret = gb_operation_sync(glights->connection, GB_LIGHTS_TYPE_GET_LIGHTS,
+ NULL, 0, &resp, sizeof(resp));
+ if (ret < 0)
+ return ret;
+
+ if (!resp.lights_count)
+ return -EINVAL;
+
+ glights->lights_count = resp.lights_count;
+
+ return 0;
+}
+
+static int gb_lights_create_all(struct gb_lights *glights)
+{
+ struct gb_connection *connection = glights->connection;
+ int ret;
+ int i;
+
+ mutex_lock(&glights->lights_lock);
+ ret = gb_lights_get_count(glights);
+ if (ret < 0)
+ goto out;
+
+ glights->lights = kzalloc(glights->lights_count *
+ sizeof(struct gb_light), GFP_KERNEL);
+ if (!glights->lights) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < glights->lights_count; i++) {
+ ret = gb_lights_light_config(glights, i);
+ if (ret < 0) {
+ dev_err(&connection->bundle->dev,
+ "Fail to configure lights device\n");
+ goto out;
+ }
+ }
+
+out:
+ mutex_unlock(&glights->lights_lock);
+ return ret;
+}
+
+static int gb_lights_register_all(struct gb_lights *glights)
+{
+ struct gb_connection *connection = glights->connection;
+ int ret = 0;
+ int i;
+
+ mutex_lock(&glights->lights_lock);
+ for (i = 0; i < glights->lights_count; i++) {
+ ret = gb_lights_light_register(&glights->lights[i]);
+ if (ret < 0) {
+ dev_err(&connection->bundle->dev,
+ "Fail to enable lights device\n");
+ break;
+ }
+ }
+
+ mutex_unlock(&glights->lights_lock);
+ return ret;
+}
+
+static int gb_lights_request_handler(struct gb_operation *op)
+{
+ struct gb_connection *connection = op->connection;
+ struct device *dev = &connection->bundle->dev;
+ struct gb_lights *glights = gb_connection_get_data(connection);
+ struct gb_light *light;
+ struct gb_message *request;
+ struct gb_lights_event_request *payload;
+ int ret = 0;
+ u8 light_id;
+ u8 event;
+
+ if (op->type != GB_LIGHTS_TYPE_EVENT) {
+ dev_err(dev, "Unsupported unsolicited event: %u\n", op->type);
+ return -EINVAL;
+ }
+
+ request = op->request;
+
+ if (request->payload_size < sizeof(*payload)) {
+ dev_err(dev, "Wrong event size received (%zu < %zu)\n",
+ request->payload_size, sizeof(*payload));
+ return -EINVAL;
+ }
+
+ payload = request->payload;
+ light_id = payload->light_id;
+
+ if (light_id >= glights->lights_count ||
+ !glights->lights[light_id].ready) {
+ dev_err(dev, "Event received for unconfigured light id: %d\n",
+ light_id);
+ return -EINVAL;
+ }
+
+ event = payload->event;
+
+ if (event & GB_LIGHTS_LIGHT_CONFIG) {
+ light = &glights->lights[light_id];
+
+ mutex_lock(&glights->lights_lock);
+ gb_lights_light_release(light);
+ ret = gb_lights_light_config(glights, light_id);
+ if (!ret)
+ ret = gb_lights_light_register(light);
+ if (ret < 0)
+ gb_lights_light_release(light);
+ mutex_unlock(&glights->lights_lock);
+ }
+
+ return ret;
+}
+
+static int gb_lights_probe(struct gb_bundle *bundle,
+ const struct greybus_bundle_id *id)
+{
+ struct greybus_descriptor_cport *cport_desc;
+ struct gb_connection *connection;
+ struct gb_lights *glights;
+ int ret;
+
+ if (bundle->num_cports != 1)
+ return -ENODEV;
+
+ cport_desc = &bundle->cport_desc[0];
+ if (cport_desc->protocol_id != GREYBUS_PROTOCOL_LIGHTS)
+ return -ENODEV;
+
+ glights = kzalloc(sizeof(*glights), GFP_KERNEL);
+ if (!glights)
+ return -ENOMEM;
+
+ mutex_init(&glights->lights_lock);
+
+ connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
+ gb_lights_request_handler);
+ if (IS_ERR(connection)) {
+ ret = PTR_ERR(connection);
+ goto out;
+ }
+
+ glights->connection = connection;
+ gb_connection_set_data(connection, glights);
+
+ greybus_set_drvdata(bundle, glights);
+
+ /* We aren't ready to receive an incoming request yet */
+ ret = gb_connection_enable_tx(connection);
+ if (ret)
+ goto error_connection_destroy;
+
+ /*
+ * Setup all the lights devices over this connection, if anything goes
+ * wrong tear down all lights
+ */
+ ret = gb_lights_create_all(glights);
+ if (ret < 0)
+ goto error_connection_disable;
+
+ /* We are ready to receive an incoming request now, enable RX as well */
+ ret = gb_connection_enable(connection);
+ if (ret)
+ goto error_connection_disable;
+
+ /* Enable & register lights */
+ ret = gb_lights_register_all(glights);
+ if (ret < 0)
+ goto error_connection_disable;
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return 0;
+
+error_connection_disable:
+ gb_connection_disable(connection);
+error_connection_destroy:
+ gb_connection_destroy(connection);
+out:
+ gb_lights_release(glights);
+ return ret;
+}
+
+static void gb_lights_disconnect(struct gb_bundle *bundle)
+{
+ struct gb_lights *glights = greybus_get_drvdata(bundle);
+
+ if (gb_pm_runtime_get_sync(bundle))
+ gb_pm_runtime_get_noresume(bundle);
+
+ gb_connection_disable(glights->connection);
+ gb_connection_destroy(glights->connection);
+
+ gb_lights_release(glights);
+}
+
+static const struct greybus_bundle_id gb_lights_id_table[] = {
+ { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LIGHTS) },
+ { }
+};
+MODULE_DEVICE_TABLE(greybus, gb_lights_id_table);
+
+static struct greybus_driver gb_lights_driver = {
+ .name = "lights",
+ .probe = gb_lights_probe,
+ .disconnect = gb_lights_disconnect,
+ .id_table = gb_lights_id_table,
+};
+module_greybus_driver(gb_lights_driver);
+
+MODULE_LICENSE("GPL v2");
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