509 lines
12 KiB
C
509 lines
12 KiB
C
/*
|
|
* pca9532.c - 16-bit Led dimmer
|
|
*
|
|
* Copyright (C) 2011 Jan Weitzel
|
|
* Copyright (C) 2008 Riku Voipio
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* 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.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 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,
|
|
},
|
|
};
|
|
|
|
static struct i2c_driver pca9532_driver = {
|
|
.driver = {
|
|
.name = "pca953x",
|
|
},
|
|
.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 & ~(0x3<<LED_NUM(led->id)*2);
|
|
/* set the new value */
|
|
reg = reg | (led->state << LED_NUM(led->id)*2);
|
|
i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
|
|
mutex_unlock(&data->update_lock);
|
|
}
|
|
|
|
static void 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; /* XXX: led api doesn't allow error code? */
|
|
}
|
|
schedule_work(&led->work);
|
|
}
|
|
|
|
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;
|
|
schedule_work(&led->work);
|
|
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 void pca9532_led_work(struct work_struct *work)
|
|
{
|
|
struct pca9532_led *led;
|
|
led = container_of(work, struct pca9532_led, work);
|
|
if (led->state == PCA9532_PWM0)
|
|
pca9532_setpwm(led->client, 0);
|
|
pca9532_setled(led);
|
|
}
|
|
|
|
#ifdef CONFIG_LEDS_PCA9532_GPIO
|
|
static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
|
|
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 = container_of(gc, struct pca9532_data, gpio);
|
|
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 = container_of(gc, struct pca9532_data, gpio);
|
|
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);
|
|
cancel_work_sync(&data->leds[i].work);
|
|
break;
|
|
case PCA9532_TYPE_N2100_BEEP:
|
|
if (data->idev != NULL) {
|
|
input_unregister_device(data->idev);
|
|
cancel_work_sync(&data->work);
|
|
data->idev = NULL;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_LEDS_PCA9532_GPIO
|
|
if (data->gpio.dev) {
|
|
int err = gpiochip_remove(&data->gpio);
|
|
if (err) {
|
|
dev_err(&data->client->dev, "%s failed, %d\n",
|
|
"gpiochip_remove()", err);
|
|
return err;
|
|
}
|
|
}
|
|
#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:
|
|
led->state = pled->state;
|
|
led->name = pled->name;
|
|
led->ldev.name = led->name;
|
|
led->ldev.brightness = LED_OFF;
|
|
led->ldev.brightness_set = pca9532_set_brightness;
|
|
led->ldev.blink_set = pca9532_set_blink;
|
|
INIT_WORK(&led->work, pca9532_led_work);
|
|
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 = input_allocate_device();
|
|
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) {
|
|
input_free_device(data->idev);
|
|
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.dev = &client->dev;
|
|
data->gpio.owner = THIS_MODULE;
|
|
|
|
err = gpiochip_add(&data->gpio);
|
|
if (err) {
|
|
/* Use data->gpio.dev as a flag for freeing gpiochip */
|
|
data->gpio.dev = 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 int pca9532_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pca9532_data *data = i2c_get_clientdata(client);
|
|
struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
|
|
int err;
|
|
|
|
if (!pca9532_pdata)
|
|
return -EIO;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -EIO;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
|
|
|
|
dev_info(&client->dev, "setting platform data\n");
|
|
i2c_set_clientdata(client, data);
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
err = pca9532_configure(client, data, pca9532_pdata);
|
|
if (err)
|
|
kfree(data);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pca9532_remove(struct i2c_client *client)
|
|
{
|
|
struct pca9532_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
err = pca9532_destroy_devices(data, data->chip_info->num_leds);
|
|
if (err)
|
|
return err;
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static int __init pca9532_init(void)
|
|
{
|
|
return i2c_add_driver(&pca9532_driver);
|
|
}
|
|
|
|
static void __exit pca9532_exit(void)
|
|
{
|
|
i2c_del_driver(&pca9532_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Riku Voipio");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
|
|
|
|
module_init(pca9532_init);
|
|
module_exit(pca9532_exit);
|
|
|