leds: pca995x: Add support for PCA995X chips
The PCA995x chips are I2C controlled LED drivers. Each chip has up to 16 outputs, each one with an individual 8-bit resolution PWM for brightness control. Signed-off-by: Isai Gaspar <isaiezequiel.gaspar@nxp.com> Signed-off-by: Marek Vasut <marex@denx.de> # Basically rewrite the driver Link: https://lore.kernel.org/r/20230713163516.21644-2-marex@denx.de Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Isai Gaspar
Lee Jones
parent
a4789089b7
commit
ee4e80b296
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@ -521,6 +521,15 @@ config LEDS_PCA963X
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LED driver chip accessed via the I2C bus. Supported
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devices include PCA9633 and PCA9634
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config LEDS_PCA995X
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tristate "LED Support for PCA995x I2C chips"
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depends on LEDS_CLASS
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depends on I2C
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help
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This option enables support for LEDs connected to PCA995x
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LED driver chips accessed via the I2C bus. Supported
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devices include PCA9955BTW, PCA9952TW and PCA9955TW.
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config LEDS_WM831X_STATUS
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tristate "LED support for status LEDs on WM831x PMICs"
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depends on LEDS_CLASS
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@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
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obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
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obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
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obj-$(CONFIG_LEDS_PCA963X) += leds-pca963x.o
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obj-$(CONFIG_LEDS_PCA995X) += leds-pca995x.o
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obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
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obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
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obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
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@ -0,0 +1,204 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* LED driver for PCA995x I2C LED drivers
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*
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* Copyright 2011 bct electronic GmbH
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* Copyright 2013 Qtechnology/AS
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* Copyright 2022 NXP
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* Copyright 2023 Marek Vasut
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*/
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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/* Register definition */
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#define PCA995X_MODE1 0x00
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#define PCA995X_MODE2 0x01
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#define PCA995X_LEDOUT0 0x02
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#define PCA9955B_PWM0 0x08
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#define PCA9952_PWM0 0x0A
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#define PCA9952_IREFALL 0x43
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#define PCA9955B_IREFALL 0x45
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/* Auto-increment disabled. Normal mode */
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#define PCA995X_MODE1_CFG 0x00
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/* LED select registers determine the source that drives LED outputs */
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#define PCA995X_LED_OFF 0x0
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#define PCA995X_LED_ON 0x1
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#define PCA995X_LED_PWM_MODE 0x2
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#define PCA995X_LDRX_MASK 0x3
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#define PCA995X_LDRX_BITS 2
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#define PCA995X_MAX_OUTPUTS 16
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#define PCA995X_OUTPUTS_PER_REG 4
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#define PCA995X_IREFALL_FULL_CFG 0xFF
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#define PCA995X_IREFALL_HALF_CFG (PCA995X_IREFALL_FULL_CFG / 2)
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#define PCA995X_TYPE_NON_B 0
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#define PCA995X_TYPE_B 1
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#define ldev_to_led(c) container_of(c, struct pca995x_led, ldev)
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struct pca995x_led {
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unsigned int led_no;
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struct led_classdev ldev;
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struct pca995x_chip *chip;
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};
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struct pca995x_chip {
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struct regmap *regmap;
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struct pca995x_led leds[PCA995X_MAX_OUTPUTS];
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int btype;
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};
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static int pca995x_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct pca995x_led *led = ldev_to_led(led_cdev);
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struct pca995x_chip *chip = led->chip;
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u8 ledout_addr, pwmout_addr;
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int shift, ret;
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pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no;
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ledout_addr = PCA995X_LEDOUT0 + (led->led_no / PCA995X_OUTPUTS_PER_REG);
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shift = PCA995X_LDRX_BITS * (led->led_no % PCA995X_OUTPUTS_PER_REG);
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switch (brightness) {
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case LED_FULL:
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return regmap_update_bits(chip->regmap, ledout_addr,
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PCA995X_LDRX_MASK << shift,
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PCA995X_LED_ON << shift);
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case LED_OFF:
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return regmap_update_bits(chip->regmap, ledout_addr,
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PCA995X_LDRX_MASK << shift, 0);
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default:
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/* Adjust brightness as per user input by changing individual PWM */
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ret = regmap_write(chip->regmap, pwmout_addr, brightness);
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if (ret)
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return ret;
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/*
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* Change LDRx configuration to individual brightness via PWM.
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* LED will stop blinking if it's doing so.
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*/
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return regmap_update_bits(chip->regmap, ledout_addr,
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PCA995X_LDRX_MASK << shift,
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PCA995X_LED_PWM_MODE << shift);
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}
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}
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static const struct regmap_config pca995x_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0x49,
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};
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static int pca995x_probe(struct i2c_client *client)
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{
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struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 };
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struct fwnode_handle *np, *child;
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struct device *dev = &client->dev;
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struct pca995x_chip *chip;
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struct pca995x_led *led;
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int i, btype, reg, ret;
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btype = (unsigned long)device_get_match_data(&client->dev);
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np = dev_fwnode(dev);
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if (!np)
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return -ENODEV;
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->btype = btype;
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chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap);
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if (IS_ERR(chip->regmap))
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return PTR_ERR(chip->regmap);
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i2c_set_clientdata(client, chip);
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fwnode_for_each_available_child_node(np, child) {
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ret = fwnode_property_read_u32(child, "reg", ®);
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if (ret) {
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fwnode_handle_put(child);
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return ret;
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}
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if (reg < 0 || reg >= PCA995X_MAX_OUTPUTS || led_fwnodes[reg]) {
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fwnode_handle_put(child);
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return -EINVAL;
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}
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led = &chip->leds[reg];
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led_fwnodes[reg] = child;
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led->chip = chip;
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led->led_no = reg;
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led->ldev.brightness_set_blocking = pca995x_brightness_set;
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led->ldev.max_brightness = 255;
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}
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for (i = 0; i < PCA995X_MAX_OUTPUTS; i++) {
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struct led_init_data init_data = {};
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if (!led_fwnodes[i])
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continue;
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init_data.fwnode = led_fwnodes[i];
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ret = devm_led_classdev_register_ext(dev,
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&chip->leds[i].ldev,
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&init_data);
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if (ret < 0) {
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fwnode_handle_put(child);
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return dev_err_probe(dev, ret,
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"Could not register LED %s\n",
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chip->leds[i].ldev.name);
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}
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}
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/* Disable LED all-call address and set normal mode */
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ret = regmap_write(chip->regmap, PCA995X_MODE1, PCA995X_MODE1_CFG);
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if (ret)
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return ret;
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/* IREF Output current value for all LEDn outputs */
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return regmap_write(chip->regmap,
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btype ? PCA9955B_IREFALL : PCA9952_IREFALL,
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PCA995X_IREFALL_HALF_CFG);
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}
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static const struct i2c_device_id pca995x_id[] = {
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{ "pca9952", .driver_data = (kernel_ulong_t)PCA995X_TYPE_NON_B },
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{ "pca9955b", .driver_data = (kernel_ulong_t)PCA995X_TYPE_B },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pca995x_id);
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static const struct of_device_id pca995x_of_match[] = {
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{ .compatible = "nxp,pca9952", .data = (void *)PCA995X_TYPE_NON_B },
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{ .compatible = "nxp,pca9955b", .data = (void *)PCA995X_TYPE_B },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, pca995x_of_match);
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static struct i2c_driver pca995x_driver = {
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.driver = {
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.name = "leds-pca995x",
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.of_match_table = pca995x_of_match,
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},
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.probe = pca995x_probe,
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.id_table = pca995x_id,
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};
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module_i2c_driver(pca995x_driver);
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MODULE_AUTHOR("Isai Gaspar <isaiezequiel.gaspar@nxp.com>");
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MODULE_DESCRIPTION("PCA995x LED driver");
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MODULE_LICENSE("GPL");
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