--- /dev/null
+/*
+ * 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)
+ 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:
+ 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 =
+ dev_get_platdata(&client->dev);
+
+ 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");
Code Review / kvmfornfv.git / blobdiff