490 lines
12 KiB
C
490 lines
12 KiB
C
/*
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* pca9532.c - 16-bit Led dimmer
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*
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* Copyright (C) 2011 Jan Weitzel
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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/documents/data_sheet/PCA9532.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/slab.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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#include <linux/gpio.h>
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/* m = num_leds*/
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#define PCA9532_REG_INPUT(i) ((i) >> 3)
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#define PCA9532_REG_OFFSET(m) ((m) >> 4)
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#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
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#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
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#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
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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_chip_info {
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u8 num_leds;
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};
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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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#ifdef CONFIG_LEDS_PCA9532_GPIO
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struct gpio_chip gpio;
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#endif
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const struct pca9532_chip_info *chip_info;
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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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enum {
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pca9530,
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pca9531,
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pca9532,
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pca9533,
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};
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static const struct i2c_device_id pca9532_id[] = {
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{ "pca9530", pca9530 },
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{ "pca9531", pca9531 },
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{ "pca9532", pca9532 },
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{ "pca9533", pca9533 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9532_id);
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static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
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[pca9530] = {
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.num_leds = 2,
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},
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[pca9531] = {
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.num_leds = 8,
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},
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[pca9532] = {
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.num_leds = 16,
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},
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[pca9533] = {
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.num_leds = 4,
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},
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};
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static struct i2c_driver pca9532_driver = {
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.driver = {
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.name = "leds-pca953x",
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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. Additionally,
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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 < data->chip_info->num_leds; 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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u8 maxleds = data->chip_info->num_leds;
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
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data->pwm[pwm]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, 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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u8 maxleds = data->chip_info->num_leds;
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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(maxleds, 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(maxleds, 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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container_of(work, struct pca9532_data, work);
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u8 maxleds = data->chip_info->num_leds;
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mutex_lock(&data->update_lock);
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i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 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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#ifdef CONFIG_LEDS_PCA9532_GPIO
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static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
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{
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struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
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struct pca9532_led *led = &data->leds[offset];
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if (led->type == PCA9532_TYPE_GPIO)
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return 0;
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return -EBUSY;
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}
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static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
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{
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struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
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struct pca9532_led *led = &data->leds[offset];
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if (val)
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led->state = PCA9532_ON;
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else
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led->state = PCA9532_OFF;
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pca9532_setled(led);
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}
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static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
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{
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struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
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unsigned char reg;
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reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
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return !!(reg & (1 << (offset % 8)));
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}
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static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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/* To use as input ensure pin is not driven */
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pca9532_gpio_set_value(gc, offset, 0);
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return 0;
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}
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static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
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{
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pca9532_gpio_set_value(gc, offset, val);
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return 0;
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}
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#endif /* CONFIG_LEDS_PCA9532_GPIO */
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static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
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{
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int i = n_devs;
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if (!data)
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return -EINVAL;
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while (--i >= 0) {
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switch (data->leds[i].type) {
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case PCA9532_TYPE_NONE:
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case PCA9532_TYPE_GPIO:
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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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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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}
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#ifdef CONFIG_LEDS_PCA9532_GPIO
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if (data->gpio.dev) {
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int err = gpiochip_remove(&data->gpio);
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if (err) {
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dev_err(&data->client->dev, "%s failed, %d\n",
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"gpiochip_remove()", err);
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return err;
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}
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}
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#endif
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return 0;
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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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int gpios = 0;
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u8 maxleds = data->chip_info->num_leds;
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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(maxleds, i),
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data->pwm[i]);
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i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
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data->psc[i]);
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}
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for (i = 0; i < data->chip_info->num_leds; 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_GPIO:
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gpios++;
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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 = devm_input_allocate_device(&client->dev);
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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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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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#ifdef CONFIG_LEDS_PCA9532_GPIO
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if (gpios) {
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data->gpio.label = "gpio-pca9532";
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data->gpio.direction_input = pca9532_gpio_direction_input;
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data->gpio.direction_output = pca9532_gpio_direction_output;
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data->gpio.set = pca9532_gpio_set_value;
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data->gpio.get = pca9532_gpio_get_value;
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data->gpio.request = pca9532_gpio_request_pin;
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data->gpio.can_sleep = 1;
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data->gpio.base = pdata->gpio_base;
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data->gpio.ngpio = data->chip_info->num_leds;
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data->gpio.dev = &client->dev;
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data->gpio.owner = THIS_MODULE;
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err = gpiochip_add(&data->gpio);
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if (err) {
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/* Use data->gpio.dev as a flag for freeing gpiochip */
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data->gpio.dev = NULL;
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dev_warn(&client->dev, "could not add gpiochip\n");
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} else {
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dev_info(&client->dev, "gpios %i...%i\n",
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data->gpio.base, data->gpio.base +
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data->gpio.ngpio - 1);
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}
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}
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#endif
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return 0;
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exit:
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pca9532_destroy_devices(data, i);
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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 =
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dev_get_platdata(&client->dev);
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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 = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
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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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return pca9532_configure(client, data, pca9532_pdata);
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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 err;
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err = pca9532_destroy_devices(data, data->chip_info->num_leds);
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if (err)
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return err;
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return 0;
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}
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module_i2c_driver(pca9532_driver);
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MODULE_AUTHOR("Riku Voipio");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("PCA 9532 LED dimmer");
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