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293 lines
7.3 KiB
293 lines
7.3 KiB
// 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 <[email protected]> |
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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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if (devm_device_add_groups(dev, omnia_led_controller_groups)) |
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dev_warn(dev, "Could not add attribute group!\n"); |
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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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}, |
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}; |
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module_i2c_driver(omnia_leds_driver); |
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MODULE_AUTHOR("Marek Behun <[email protected]>"); |
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MODULE_DESCRIPTION("CZ.NIC's Turris Omnia LEDs"); |
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MODULE_LICENSE("GPL v2");
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