Orange Pi5 kernel

// 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 <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/input.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
#include <linux/gpio/driver.h>
#include <linux/of.h>
#include <linux/of_device.h>
 
/* 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,
<------>const struct i2c_device_id *id);
static int 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 int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
{
<------>int i = n_devs;
 
<------>if (!data)
<------><------>return -EINVAL;
 
<------>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
 
<------>return 0;
}
 
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);
 
<------>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)
{
<------>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 int pca9532_remove(struct i2c_client *client)
{
<------>struct pca9532_data *data = i2c_get_clientdata(client);
 
<------>return 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");