https://jxself.org/git/linux-libre.git
Tip revision: c44e1cfe9b4bd7efaf69ee4345d3db36907f1bdc authored by Jason Self on 13 May 2014, 12:00:11 UTC
Linux-libre 3.10.40-gnu
Linux-libre 3.10.40-gnu
Tip revision: c44e1cf
leds-pca9532.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 = "leds-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) {
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 = 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.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;
if (!pca9532_pdata)
return -EIO;
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[id->driver_data];
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);
int err;
err = pca9532_destroy_devices(data, data->chip_info->num_leds);
if (err)
return err;
return 0;
}
module_i2c_driver(pca9532_driver);
MODULE_AUTHOR("Riku Voipio");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCA 9532 LED dimmer");