From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/leds/leds-pca9532.c | 558 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 558 insertions(+) create mode 100644 drivers/leds/leds-pca9532.c (limited to 'drivers/leds/leds-pca9532.c') diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c new file mode 100644 index 0000000000..bf8bb8fc00 --- /dev/null +++ b/drivers/leds/leds-pca9532.c @@ -0,0 +1,558 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * pca9532.c - 16-bit Led dimmer + * + * Copyright (C) 2011 Jan Weitzel + * Copyright (C) 2008 Riku Voipio + * + * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* m = num_leds*/ +#define PCA9532_REG_INPUT(i) ((i) >> 3) +#define PCA9532_REG_OFFSET(m) ((m) >> 4) +#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2) +#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2) +#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2)) +#define LED_NUM(led) (led & 0x3) +#define LED_SHIFT(led) (LED_NUM(led) * 2) +#define LED_MASK(led) (0x3 << LED_SHIFT(led)) + +#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) + +struct pca9532_chip_info { + u8 num_leds; +}; + +struct pca9532_data { + struct i2c_client *client; + struct pca9532_led leds[16]; + struct mutex update_lock; + struct input_dev *idev; + struct work_struct work; +#ifdef CONFIG_LEDS_PCA9532_GPIO + struct gpio_chip gpio; +#endif + const struct pca9532_chip_info *chip_info; + u8 pwm[2]; + u8 psc[2]; +}; + +static int pca9532_probe(struct i2c_client *client); +static void pca9532_remove(struct i2c_client *client); + +enum { + pca9530, + pca9531, + pca9532, + pca9533, +}; + +static const struct i2c_device_id pca9532_id[] = { + { "pca9530", pca9530 }, + { "pca9531", pca9531 }, + { "pca9532", pca9532 }, + { "pca9533", pca9533 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, pca9532_id); + +static const struct pca9532_chip_info pca9532_chip_info_tbl[] = { + [pca9530] = { + .num_leds = 2, + }, + [pca9531] = { + .num_leds = 8, + }, + [pca9532] = { + .num_leds = 16, + }, + [pca9533] = { + .num_leds = 4, + }, +}; + +#ifdef CONFIG_OF +static const struct of_device_id of_pca9532_leds_match[] = { + { .compatible = "nxp,pca9530", .data = (void *)pca9530 }, + { .compatible = "nxp,pca9531", .data = (void *)pca9531 }, + { .compatible = "nxp,pca9532", .data = (void *)pca9532 }, + { .compatible = "nxp,pca9533", .data = (void *)pca9533 }, + {}, +}; + +MODULE_DEVICE_TABLE(of, of_pca9532_leds_match); +#endif + +static struct i2c_driver pca9532_driver = { + .driver = { + .name = "leds-pca953x", + .of_match_table = of_match_ptr(of_pca9532_leds_match), + }, + .probe = pca9532_probe, + .remove = pca9532_remove, + .id_table = pca9532_id, +}; + +/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally, + * the clever Thecus people are using one pwm to drive the beeper. So, + * as a compromise we average one pwm to the values requested by all + * leds that are not ON/OFF. + * */ +static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, + enum led_brightness value) +{ + int a = 0, b = 0, i = 0; + struct pca9532_data *data = i2c_get_clientdata(client); + for (i = 0; i < data->chip_info->num_leds; i++) { + if (data->leds[i].type == PCA9532_TYPE_LED && + data->leds[i].state == PCA9532_PWM0+pwm) { + a++; + b += data->leds[i].ldev.brightness; + } + } + if (a == 0) { + dev_err(&client->dev, + "fear of division by zero %d/%d, wanted %d\n", + b, a, value); + return -EINVAL; + } + b = b/a; + if (b > 0xFF) + return -EINVAL; + data->pwm[pwm] = b; + data->psc[pwm] = blink; + return 0; +} + +static int pca9532_setpwm(struct i2c_client *client, int pwm) +{ + struct pca9532_data *data = i2c_get_clientdata(client); + u8 maxleds = data->chip_info->num_leds; + + mutex_lock(&data->update_lock); + i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm), + data->pwm[pwm]); + i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm), + data->psc[pwm]); + mutex_unlock(&data->update_lock); + return 0; +} + +/* Set LED routing */ +static void pca9532_setled(struct pca9532_led *led) +{ + struct i2c_client *client = led->client; + struct pca9532_data *data = i2c_get_clientdata(client); + u8 maxleds = data->chip_info->num_leds; + char reg; + + mutex_lock(&data->update_lock); + reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); + /* zero led bits */ + reg = reg & ~LED_MASK(led->id); + /* set the new value */ + reg = reg | (led->state << LED_SHIFT(led->id)); + i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg); + mutex_unlock(&data->update_lock); +} + +static int pca9532_set_brightness(struct led_classdev *led_cdev, + enum led_brightness value) +{ + int err = 0; + struct pca9532_led *led = ldev_to_led(led_cdev); + + if (value == LED_OFF) + led->state = PCA9532_OFF; + else if (value == LED_FULL) + led->state = PCA9532_ON; + else { + led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ + err = pca9532_calcpwm(led->client, 0, 0, value); + if (err) + return err; + } + if (led->state == PCA9532_PWM0) + pca9532_setpwm(led->client, 0); + pca9532_setled(led); + return err; +} + +static int pca9532_set_blink(struct led_classdev *led_cdev, + unsigned long *delay_on, unsigned long *delay_off) +{ + struct pca9532_led *led = ldev_to_led(led_cdev); + struct i2c_client *client = led->client; + int psc; + int err = 0; + + if (*delay_on == 0 && *delay_off == 0) { + /* led subsystem ask us for a blink rate */ + *delay_on = 1000; + *delay_off = 1000; + } + if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) + return -EINVAL; + + /* Thecus specific: only use PSC/PWM 0 */ + psc = (*delay_on * 152-1)/1000; + err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); + if (err) + return err; + if (led->state == PCA9532_PWM0) + pca9532_setpwm(led->client, 0); + pca9532_setled(led); + + return 0; +} + +static int pca9532_event(struct input_dev *dev, unsigned int type, + unsigned int code, int value) +{ + struct pca9532_data *data = input_get_drvdata(dev); + + if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) + return -1; + + /* XXX: allow different kind of beeps with psc/pwm modifications */ + if (value > 1 && value < 32767) + data->pwm[1] = 127; + else + data->pwm[1] = 0; + + schedule_work(&data->work); + + return 0; +} + +static void pca9532_input_work(struct work_struct *work) +{ + struct pca9532_data *data = + container_of(work, struct pca9532_data, work); + u8 maxleds = data->chip_info->num_leds; + + mutex_lock(&data->update_lock); + i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1), + data->pwm[1]); + mutex_unlock(&data->update_lock); +} + +static enum pca9532_state pca9532_getled(struct pca9532_led *led) +{ + struct i2c_client *client = led->client; + struct pca9532_data *data = i2c_get_clientdata(client); + u8 maxleds = data->chip_info->num_leds; + char reg; + enum pca9532_state ret; + + mutex_lock(&data->update_lock); + reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); + ret = (reg & LED_MASK(led->id)) >> LED_SHIFT(led->id); + mutex_unlock(&data->update_lock); + return ret; +} + +#ifdef CONFIG_LEDS_PCA9532_GPIO +static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) +{ + struct pca9532_data *data = gpiochip_get_data(gc); + struct pca9532_led *led = &data->leds[offset]; + + if (led->type == PCA9532_TYPE_GPIO) + return 0; + + return -EBUSY; +} + +static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) +{ + struct pca9532_data *data = gpiochip_get_data(gc); + struct pca9532_led *led = &data->leds[offset]; + + if (val) + led->state = PCA9532_ON; + else + led->state = PCA9532_OFF; + + pca9532_setled(led); +} + +static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) +{ + struct pca9532_data *data = gpiochip_get_data(gc); + unsigned char reg; + + reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); + + return !!(reg & (1 << (offset % 8))); +} + +static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) +{ + /* To use as input ensure pin is not driven */ + pca9532_gpio_set_value(gc, offset, 0); + + return 0; +} + +static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) +{ + pca9532_gpio_set_value(gc, offset, val); + + return 0; +} +#endif /* CONFIG_LEDS_PCA9532_GPIO */ + +static void pca9532_destroy_devices(struct pca9532_data *data, int n_devs) +{ + int i = n_devs; + + while (--i >= 0) { + switch (data->leds[i].type) { + case PCA9532_TYPE_NONE: + case PCA9532_TYPE_GPIO: + break; + case PCA9532_TYPE_LED: + led_classdev_unregister(&data->leds[i].ldev); + break; + case PCA9532_TYPE_N2100_BEEP: + if (data->idev != NULL) { + cancel_work_sync(&data->work); + data->idev = NULL; + } + break; + } + } + +#ifdef CONFIG_LEDS_PCA9532_GPIO + if (data->gpio.parent) + gpiochip_remove(&data->gpio); +#endif +} + +static int pca9532_configure(struct i2c_client *client, + struct pca9532_data *data, struct pca9532_platform_data *pdata) +{ + int i, err = 0; + int gpios = 0; + u8 maxleds = data->chip_info->num_leds; + + for (i = 0; i < 2; i++) { + data->pwm[i] = pdata->pwm[i]; + data->psc[i] = pdata->psc[i]; + i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), + data->pwm[i]); + i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), + data->psc[i]); + } + + for (i = 0; i < data->chip_info->num_leds; i++) { + struct pca9532_led *led = &data->leds[i]; + struct pca9532_led *pled = &pdata->leds[i]; + led->client = client; + led->id = i; + led->type = pled->type; + switch (led->type) { + case PCA9532_TYPE_NONE: + break; + case PCA9532_TYPE_GPIO: + gpios++; + break; + case PCA9532_TYPE_LED: + if (pled->state == PCA9532_KEEP) + led->state = pca9532_getled(led); + else + led->state = pled->state; + led->name = pled->name; + led->ldev.name = led->name; + led->ldev.default_trigger = pled->default_trigger; + led->ldev.brightness = LED_OFF; + led->ldev.brightness_set_blocking = + pca9532_set_brightness; + led->ldev.blink_set = pca9532_set_blink; + err = led_classdev_register(&client->dev, &led->ldev); + if (err < 0) { + dev_err(&client->dev, + "couldn't register LED %s\n", + led->name); + goto exit; + } + pca9532_setled(led); + break; + case PCA9532_TYPE_N2100_BEEP: + BUG_ON(data->idev); + led->state = PCA9532_PWM1; + pca9532_setled(led); + data->idev = devm_input_allocate_device(&client->dev); + if (data->idev == NULL) { + err = -ENOMEM; + goto exit; + } + data->idev->name = pled->name; + data->idev->phys = "i2c/pca9532"; + data->idev->id.bustype = BUS_HOST; + data->idev->id.vendor = 0x001f; + data->idev->id.product = 0x0001; + data->idev->id.version = 0x0100; + data->idev->evbit[0] = BIT_MASK(EV_SND); + data->idev->sndbit[0] = BIT_MASK(SND_BELL) | + BIT_MASK(SND_TONE); + data->idev->event = pca9532_event; + input_set_drvdata(data->idev, data); + INIT_WORK(&data->work, pca9532_input_work); + err = input_register_device(data->idev); + if (err) { + cancel_work_sync(&data->work); + data->idev = NULL; + goto exit; + } + break; + } + } + +#ifdef CONFIG_LEDS_PCA9532_GPIO + if (gpios) { + data->gpio.label = "gpio-pca9532"; + data->gpio.direction_input = pca9532_gpio_direction_input; + data->gpio.direction_output = pca9532_gpio_direction_output; + data->gpio.set = pca9532_gpio_set_value; + data->gpio.get = pca9532_gpio_get_value; + data->gpio.request = pca9532_gpio_request_pin; + data->gpio.can_sleep = 1; + data->gpio.base = pdata->gpio_base; + data->gpio.ngpio = data->chip_info->num_leds; + data->gpio.parent = &client->dev; + data->gpio.owner = THIS_MODULE; + + err = gpiochip_add_data(&data->gpio, data); + if (err) { + /* Use data->gpio.dev as a flag for freeing gpiochip */ + data->gpio.parent = NULL; + dev_warn(&client->dev, "could not add gpiochip\n"); + } else { + dev_info(&client->dev, "gpios %i...%i\n", + data->gpio.base, data->gpio.base + + data->gpio.ngpio - 1); + } + } +#endif + + return 0; + +exit: + pca9532_destroy_devices(data, i); + return err; +} + +static struct pca9532_platform_data * +pca9532_of_populate_pdata(struct device *dev, struct device_node *np) +{ + struct pca9532_platform_data *pdata; + struct device_node *child; + int devid, maxleds; + int i = 0; + const char *state; + + devid = (int)(uintptr_t)of_device_get_match_data(dev); + maxleds = pca9532_chip_info_tbl[devid].num_leds; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->gpio_base = -1; + + of_property_read_u8_array(np, "nxp,pwm", &pdata->pwm[0], + ARRAY_SIZE(pdata->pwm)); + of_property_read_u8_array(np, "nxp,psc", &pdata->psc[0], + ARRAY_SIZE(pdata->psc)); + + for_each_available_child_of_node(np, child) { + if (of_property_read_string(child, "label", + &pdata->leds[i].name)) + pdata->leds[i].name = child->name; + of_property_read_u32(child, "type", &pdata->leds[i].type); + of_property_read_string(child, "linux,default-trigger", + &pdata->leds[i].default_trigger); + if (!of_property_read_string(child, "default-state", &state)) { + if (!strcmp(state, "on")) + pdata->leds[i].state = PCA9532_ON; + else if (!strcmp(state, "keep")) + pdata->leds[i].state = PCA9532_KEEP; + } + if (++i >= maxleds) { + of_node_put(child); + break; + } + } + + return pdata; +} + +static int pca9532_probe(struct i2c_client *client) +{ + const struct i2c_device_id *id = i2c_client_get_device_id(client); + int devid; + struct pca9532_data *data = i2c_get_clientdata(client); + struct pca9532_platform_data *pca9532_pdata = + dev_get_platdata(&client->dev); + struct device_node *np = dev_of_node(&client->dev); + + if (!pca9532_pdata) { + if (np) { + pca9532_pdata = + pca9532_of_populate_pdata(&client->dev, np); + if (IS_ERR(pca9532_pdata)) + return PTR_ERR(pca9532_pdata); + } else { + dev_err(&client->dev, "no platform data\n"); + return -EINVAL; + } + devid = (int)(uintptr_t)of_device_get_match_data(&client->dev); + } else { + devid = id->driver_data; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->chip_info = &pca9532_chip_info_tbl[devid]; + + dev_info(&client->dev, "setting platform data\n"); + i2c_set_clientdata(client, data); + data->client = client; + mutex_init(&data->update_lock); + + return pca9532_configure(client, data, pca9532_pdata); +} + +static void pca9532_remove(struct i2c_client *client) +{ + struct pca9532_data *data = i2c_get_clientdata(client); + + pca9532_destroy_devices(data, data->chip_info->num_leds); +} + +module_i2c_driver(pca9532_driver); + +MODULE_AUTHOR("Riku Voipio"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("PCA 9532 LED dimmer"); -- cgit v1.2.3