374 lines
9.1 KiB
C
374 lines
9.1 KiB
C
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/*
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* pca9532.c - 16-bit Led dimmer
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*
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* Copyright (C) 2008 Riku Voipio
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf
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*
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/input.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/leds-pca9532.h>
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#define PCA9532_REG_PSC(i) (0x2+(i)*2)
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#define PCA9532_REG_PWM(i) (0x3+(i)*2)
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#define PCA9532_REG_LS0 0x6
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#define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
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#define LED_NUM(led) (led & 0x3)
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#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
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struct pca9532_data {
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struct i2c_client *client;
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struct pca9532_led leds[16];
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struct mutex update_lock;
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struct input_dev *idev;
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struct work_struct work;
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u8 pwm[2];
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u8 psc[2];
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};
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static int pca9532_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int pca9532_remove(struct i2c_client *client);
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static const struct i2c_device_id pca9532_id[] = {
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{ "pca9532", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9532_id);
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static struct i2c_driver pca9532_driver = {
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.driver = {
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.name = "pca9532",
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},
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.probe = pca9532_probe,
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.remove = pca9532_remove,
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.id_table = pca9532_id,
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};
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/* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
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* the clever Thecus people are using one pwm to drive the beeper. So,
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* as a compromise we average one pwm to the values requested by all
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* leds that are not ON/OFF.
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* */
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static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
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enum led_brightness value)
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{
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int a = 0, b = 0, i = 0;
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struct pca9532_data *data = i2c_get_clientdata(client);
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for (i = 0; i < 16; i++) {
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if (data->leds[i].type == PCA9532_TYPE_LED &&
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data->leds[i].state == PCA9532_PWM0+pwm) {
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a++;
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b += data->leds[i].ldev.brightness;
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}
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}
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if (a == 0) {
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dev_err(&client->dev,
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"fear of division by zero %d/%d, wanted %d\n",
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b, a, value);
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return -EINVAL;
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}
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b = b/a;
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if (b > 0xFF)
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return -EINVAL;
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data->pwm[pwm] = b;
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data->psc[pwm] = blink;
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return 0;
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}
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static int pca9532_setpwm(struct i2c_client *client, int pwm)
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{
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struct pca9532_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
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data->pwm[pwm]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm),
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data->psc[pwm]);
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mutex_unlock(&data->update_lock);
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return 0;
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}
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/* Set LED routing */
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static void pca9532_setled(struct pca9532_led *led)
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{
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struct i2c_client *client = led->client;
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struct pca9532_data *data = i2c_get_clientdata(client);
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char reg;
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mutex_lock(&data->update_lock);
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reg = i2c_smbus_read_byte_data(client, LED_REG(led->id));
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/* zero led bits */
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reg = reg & ~(0x3<<LED_NUM(led->id)*2);
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/* set the new value */
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reg = reg | (led->state << LED_NUM(led->id)*2);
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i2c_smbus_write_byte_data(client, LED_REG(led->id), reg);
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mutex_unlock(&data->update_lock);
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}
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static void pca9532_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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int err = 0;
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struct pca9532_led *led = ldev_to_led(led_cdev);
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if (value == LED_OFF)
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led->state = PCA9532_OFF;
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else if (value == LED_FULL)
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led->state = PCA9532_ON;
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else {
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led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
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err = pca9532_calcpwm(led->client, 0, 0, value);
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if (err)
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return; /* XXX: led api doesn't allow error code? */
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}
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schedule_work(&led->work);
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}
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static int pca9532_set_blink(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct pca9532_led *led = ldev_to_led(led_cdev);
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struct i2c_client *client = led->client;
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int psc;
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int err = 0;
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if (*delay_on == 0 && *delay_off == 0) {
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/* led subsystem ask us for a blink rate */
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*delay_on = 1000;
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*delay_off = 1000;
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}
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if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
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return -EINVAL;
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/* Thecus specific: only use PSC/PWM 0 */
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psc = (*delay_on * 152-1)/1000;
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err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
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if (err)
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return err;
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schedule_work(&led->work);
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return 0;
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}
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static int pca9532_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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struct pca9532_data *data = input_get_drvdata(dev);
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if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
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return -1;
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/* XXX: allow different kind of beeps with psc/pwm modifications */
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if (value > 1 && value < 32767)
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data->pwm[1] = 127;
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else
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data->pwm[1] = 0;
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schedule_work(&data->work);
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return 0;
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}
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static void pca9532_input_work(struct work_struct *work)
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{
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struct pca9532_data *data;
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data = container_of(work, struct pca9532_data, work);
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
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data->pwm[1]);
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mutex_unlock(&data->update_lock);
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}
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static void pca9532_led_work(struct work_struct *work)
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{
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struct pca9532_led *led;
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led = container_of(work, struct pca9532_led, work);
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if (led->state == PCA9532_PWM0)
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pca9532_setpwm(led->client, 0);
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pca9532_setled(led);
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}
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static int pca9532_configure(struct i2c_client *client,
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struct pca9532_data *data, struct pca9532_platform_data *pdata)
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{
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int i, err = 0;
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for (i = 0; i < 2; i++) {
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data->pwm[i] = pdata->pwm[i];
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data->psc[i] = pdata->psc[i];
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i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i),
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data->pwm[i]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
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data->psc[i]);
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}
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for (i = 0; i < 16; i++) {
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struct pca9532_led *led = &data->leds[i];
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struct pca9532_led *pled = &pdata->leds[i];
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led->client = client;
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led->id = i;
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led->type = pled->type;
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switch (led->type) {
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case PCA9532_TYPE_NONE:
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break;
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case PCA9532_TYPE_LED:
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led->state = pled->state;
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led->name = pled->name;
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led->ldev.name = led->name;
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led->ldev.brightness = LED_OFF;
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led->ldev.brightness_set = pca9532_set_brightness;
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led->ldev.blink_set = pca9532_set_blink;
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INIT_WORK(&led->work, pca9532_led_work);
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err = led_classdev_register(&client->dev, &led->ldev);
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if (err < 0) {
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dev_err(&client->dev,
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"couldn't register LED %s\n",
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led->name);
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goto exit;
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}
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pca9532_setled(led);
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break;
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case PCA9532_TYPE_N2100_BEEP:
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BUG_ON(data->idev);
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led->state = PCA9532_PWM1;
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pca9532_setled(led);
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data->idev = input_allocate_device();
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if (data->idev == NULL) {
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err = -ENOMEM;
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goto exit;
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}
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data->idev->name = pled->name;
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data->idev->phys = "i2c/pca9532";
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data->idev->id.bustype = BUS_HOST;
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data->idev->id.vendor = 0x001f;
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data->idev->id.product = 0x0001;
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data->idev->id.version = 0x0100;
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data->idev->evbit[0] = BIT_MASK(EV_SND);
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data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
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BIT_MASK(SND_TONE);
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data->idev->event = pca9532_event;
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input_set_drvdata(data->idev, data);
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INIT_WORK(&data->work, pca9532_input_work);
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err = input_register_device(data->idev);
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if (err) {
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input_free_device(data->idev);
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cancel_work_sync(&data->work);
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data->idev = NULL;
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goto exit;
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}
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break;
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}
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}
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return 0;
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exit:
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if (i > 0)
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for (i = i - 1; i >= 0; i--)
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switch (data->leds[i].type) {
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case PCA9532_TYPE_NONE:
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break;
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case PCA9532_TYPE_LED:
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led_classdev_unregister(&data->leds[i].ldev);
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cancel_work_sync(&data->leds[i].work);
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break;
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case PCA9532_TYPE_N2100_BEEP:
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if (data->idev != NULL) {
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input_unregister_device(data->idev);
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input_free_device(data->idev);
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cancel_work_sync(&data->work);
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data->idev = NULL;
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}
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break;
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}
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return err;
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}
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static int pca9532_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pca9532_data *data = i2c_get_clientdata(client);
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struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
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int err;
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if (!pca9532_pdata)
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return -EIO;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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dev_info(&client->dev, "setting platform data\n");
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i2c_set_clientdata(client, data);
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data->client = client;
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mutex_init(&data->update_lock);
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err = pca9532_configure(client, data, pca9532_pdata);
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if (err) {
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kfree(data);
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i2c_set_clientdata(client, NULL);
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}
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return err;
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}
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static int pca9532_remove(struct i2c_client *client)
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{
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struct pca9532_data *data = i2c_get_clientdata(client);
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int i;
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for (i = 0; i < 16; i++)
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switch (data->leds[i].type) {
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case PCA9532_TYPE_NONE:
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break;
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case PCA9532_TYPE_LED:
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led_classdev_unregister(&data->leds[i].ldev);
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cancel_work_sync(&data->leds[i].work);
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break;
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case PCA9532_TYPE_N2100_BEEP:
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if (data->idev != NULL) {
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input_unregister_device(data->idev);
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input_free_device(data->idev);
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cancel_work_sync(&data->work);
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data->idev = NULL;
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}
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break;
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}
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kfree(data);
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i2c_set_clientdata(client, NULL);
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return 0;
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}
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static int __init pca9532_init(void)
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{
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|
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);
|
||
|
|
|