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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The driver core supports the ability to handle the creation and removal of device-specific sysfs files in a race-free manner. Take advantage of that by converting this driver to use this by moving the sysfs attributes into a group and assigning the dev_groups pointer to it. Cc: Pavel Machek <pavel@ucw.cz> Cc: linux-leds@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Marek Behún <kabel@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Pavel Machek <pavel@ucw.cz>
291 lines
7.3 KiB
C
291 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CZ.NIC's Turris Omnia LEDs driver
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*
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* 2020 by Marek Behún <kabel@kernel.org>
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*/
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#include <linux/i2c.h>
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#include <linux/led-class-multicolor.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include "leds.h"
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#define OMNIA_BOARD_LEDS 12
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#define OMNIA_LED_NUM_CHANNELS 3
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#define CMD_LED_MODE 3
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#define CMD_LED_MODE_LED(l) ((l) & 0x0f)
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#define CMD_LED_MODE_USER 0x10
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#define CMD_LED_STATE 4
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#define CMD_LED_STATE_LED(l) ((l) & 0x0f)
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#define CMD_LED_STATE_ON 0x10
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#define CMD_LED_COLOR 5
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#define CMD_LED_SET_BRIGHTNESS 7
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#define CMD_LED_GET_BRIGHTNESS 8
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struct omnia_led {
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struct led_classdev_mc mc_cdev;
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struct mc_subled subled_info[OMNIA_LED_NUM_CHANNELS];
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int reg;
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};
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#define to_omnia_led(l) container_of(l, struct omnia_led, mc_cdev)
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struct omnia_leds {
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struct i2c_client *client;
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struct mutex lock;
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struct omnia_led leds[];
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};
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static int omnia_led_brightness_set_blocking(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev);
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struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent);
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struct omnia_led *led = to_omnia_led(mc_cdev);
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u8 buf[5], state;
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int ret;
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mutex_lock(&leds->lock);
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led_mc_calc_color_components(&led->mc_cdev, brightness);
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buf[0] = CMD_LED_COLOR;
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buf[1] = led->reg;
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buf[2] = mc_cdev->subled_info[0].brightness;
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buf[3] = mc_cdev->subled_info[1].brightness;
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buf[4] = mc_cdev->subled_info[2].brightness;
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state = CMD_LED_STATE_LED(led->reg);
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if (buf[2] || buf[3] || buf[4])
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state |= CMD_LED_STATE_ON;
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ret = i2c_smbus_write_byte_data(leds->client, CMD_LED_STATE, state);
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if (ret >= 0 && (state & CMD_LED_STATE_ON))
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ret = i2c_master_send(leds->client, buf, 5);
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mutex_unlock(&leds->lock);
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return ret;
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}
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static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
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struct device_node *np)
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{
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struct led_init_data init_data = {};
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struct device *dev = &client->dev;
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struct led_classdev *cdev;
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int ret, color;
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ret = of_property_read_u32(np, "reg", &led->reg);
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if (ret || led->reg >= OMNIA_BOARD_LEDS) {
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dev_warn(dev,
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"Node %pOF: must contain 'reg' property with values between 0 and %i\n",
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np, OMNIA_BOARD_LEDS - 1);
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return 0;
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}
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ret = of_property_read_u32(np, "color", &color);
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if (ret || color != LED_COLOR_ID_RGB) {
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dev_warn(dev,
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"Node %pOF: must contain 'color' property with value LED_COLOR_ID_RGB\n",
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np);
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return 0;
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}
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led->subled_info[0].color_index = LED_COLOR_ID_RED;
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led->subled_info[0].channel = 0;
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led->subled_info[1].color_index = LED_COLOR_ID_GREEN;
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led->subled_info[1].channel = 1;
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led->subled_info[2].color_index = LED_COLOR_ID_BLUE;
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led->subled_info[2].channel = 2;
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led->mc_cdev.subled_info = led->subled_info;
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led->mc_cdev.num_colors = OMNIA_LED_NUM_CHANNELS;
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init_data.fwnode = &np->fwnode;
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cdev = &led->mc_cdev.led_cdev;
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cdev->max_brightness = 255;
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cdev->brightness_set_blocking = omnia_led_brightness_set_blocking;
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/* put the LED into software mode */
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ret = i2c_smbus_write_byte_data(client, CMD_LED_MODE,
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CMD_LED_MODE_LED(led->reg) |
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CMD_LED_MODE_USER);
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if (ret < 0) {
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dev_err(dev, "Cannot set LED %pOF to software mode: %i\n", np,
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ret);
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return ret;
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}
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/* disable the LED */
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ret = i2c_smbus_write_byte_data(client, CMD_LED_STATE,
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CMD_LED_STATE_LED(led->reg));
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if (ret < 0) {
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dev_err(dev, "Cannot set LED %pOF brightness: %i\n", np, ret);
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return ret;
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}
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ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc_cdev,
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&init_data);
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if (ret < 0) {
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dev_err(dev, "Cannot register LED %pOF: %i\n", np, ret);
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return ret;
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}
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return 1;
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}
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/*
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* On the front panel of the Turris Omnia router there is also a button which
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* can be used to control the intensity of all the LEDs at once, so that if they
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* are too bright, user can dim them.
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* The microcontroller cycles between 8 levels of this global brightness (from
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* 100% to 0%), but this setting can have any integer value between 0 and 100.
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* It is therefore convenient to be able to change this setting from software.
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* We expose this setting via a sysfs attribute file called "brightness". This
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* file lives in the device directory of the LED controller, not an individual
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* LED, so it should not confuse users.
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*/
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static ssize_t brightness_show(struct device *dev, struct device_attribute *a,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct omnia_leds *leds = i2c_get_clientdata(client);
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int ret;
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mutex_lock(&leds->lock);
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ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS);
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mutex_unlock(&leds->lock);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", ret);
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}
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static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct omnia_leds *leds = i2c_get_clientdata(client);
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unsigned long brightness;
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int ret;
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if (kstrtoul(buf, 10, &brightness))
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return -EINVAL;
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if (brightness > 100)
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return -EINVAL;
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mutex_lock(&leds->lock);
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ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS,
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(u8)brightness);
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mutex_unlock(&leds->lock);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RW(brightness);
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static struct attribute *omnia_led_controller_attrs[] = {
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&dev_attr_brightness.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(omnia_led_controller);
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static int omnia_leds_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct device_node *np = dev_of_node(dev), *child;
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struct omnia_leds *leds;
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struct omnia_led *led;
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int ret, count;
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count = of_get_available_child_count(np);
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if (!count) {
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dev_err(dev, "LEDs are not defined in device tree!\n");
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return -ENODEV;
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} else if (count > OMNIA_BOARD_LEDS) {
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dev_err(dev, "Too many LEDs defined in device tree!\n");
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return -EINVAL;
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}
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leds = devm_kzalloc(dev, struct_size(leds, leds, count), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds->client = client;
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i2c_set_clientdata(client, leds);
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mutex_init(&leds->lock);
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led = &leds->leds[0];
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for_each_available_child_of_node(np, child) {
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ret = omnia_led_register(client, led, child);
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if (ret < 0) {
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of_node_put(child);
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return ret;
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}
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led += ret;
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}
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return 0;
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}
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static int omnia_leds_remove(struct i2c_client *client)
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{
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u8 buf[5];
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/* put all LEDs into default (HW triggered) mode */
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i2c_smbus_write_byte_data(client, CMD_LED_MODE,
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CMD_LED_MODE_LED(OMNIA_BOARD_LEDS));
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/* set all LEDs color to [255, 255, 255] */
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buf[0] = CMD_LED_COLOR;
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buf[1] = OMNIA_BOARD_LEDS;
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buf[2] = 255;
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buf[3] = 255;
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buf[4] = 255;
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i2c_master_send(client, buf, 5);
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return 0;
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}
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static const struct of_device_id of_omnia_leds_match[] = {
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{ .compatible = "cznic,turris-omnia-leds", },
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{},
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};
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static const struct i2c_device_id omnia_id[] = {
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{ "omnia", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, omnia_id);
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static struct i2c_driver omnia_leds_driver = {
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.probe = omnia_leds_probe,
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.remove = omnia_leds_remove,
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.id_table = omnia_id,
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.driver = {
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.name = "leds-turris-omnia",
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.of_match_table = of_omnia_leds_match,
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.dev_groups = omnia_led_controller_groups,
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},
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};
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module_i2c_driver(omnia_leds_driver);
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MODULE_AUTHOR("Marek Behun <kabel@kernel.org>");
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MODULE_DESCRIPTION("CZ.NIC's Turris Omnia LEDs");
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MODULE_LICENSE("GPL v2");
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