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![Uwe Kleine-König](/assets/img/avatar_default.png)
Up to now pca9532_destroy_devices() returns always zero because it's always called with data != NULL. Remove the never-taken error path and make it return void which makes it easier to see in the callers that there is no error to handle. Also the return value of i2c remove callbacks is ignored anyway. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Pavel Machek <pavel@ucw.cz>
562 lines
14 KiB
C
562 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
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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/driver.h>
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#include <linux/of.h>
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#include <linux/of_device.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 LED_SHIFT(led) (LED_NUM(led) * 2)
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#define LED_MASK(led) (0x3 << LED_SHIFT(led))
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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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#ifdef CONFIG_OF
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static const struct of_device_id of_pca9532_leds_match[] = {
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{ .compatible = "nxp,pca9530", .data = (void *)pca9530 },
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{ .compatible = "nxp,pca9531", .data = (void *)pca9531 },
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{ .compatible = "nxp,pca9532", .data = (void *)pca9532 },
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{ .compatible = "nxp,pca9533", .data = (void *)pca9533 },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
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#endif
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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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.of_match_table = of_match_ptr(of_pca9532_leds_match),
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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 & ~LED_MASK(led->id);
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/* set the new value */
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reg = reg | (led->state << LED_SHIFT(led->id));
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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 int 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 err;
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}
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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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return err;
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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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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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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 enum pca9532_state pca9532_getled(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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enum pca9532_state ret;
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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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ret = (reg & LED_MASK(led->id)) >> LED_SHIFT(led->id);
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mutex_unlock(&data->update_lock);
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return ret;
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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 = gpiochip_get_data(gc);
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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 = gpiochip_get_data(gc);
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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 = gpiochip_get_data(gc);
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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 void 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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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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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.parent)
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gpiochip_remove(&data->gpio);
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#endif
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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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if (pled->state == PCA9532_KEEP)
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led->state = pca9532_getled(led);
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else
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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.default_trigger = pled->default_trigger;
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led->ldev.brightness = LED_OFF;
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led->ldev.brightness_set_blocking =
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pca9532_set_brightness;
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led->ldev.blink_set = pca9532_set_blink;
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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.parent = &client->dev;
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data->gpio.owner = THIS_MODULE;
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err = gpiochip_add_data(&data->gpio, data);
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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.parent = 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 struct pca9532_platform_data *
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pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
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{
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struct pca9532_platform_data *pdata;
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struct device_node *child;
|
|
int devid, maxleds;
|
|
int i = 0;
|
|
const char *state;
|
|
|
|
devid = (int)(uintptr_t)of_device_get_match_data(dev);
|
|
maxleds = pca9532_chip_info_tbl[devid].num_leds;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pdata->gpio_base = -1;
|
|
|
|
of_property_read_u8_array(np, "nxp,pwm", &pdata->pwm[0],
|
|
ARRAY_SIZE(pdata->pwm));
|
|
of_property_read_u8_array(np, "nxp,psc", &pdata->psc[0],
|
|
ARRAY_SIZE(pdata->psc));
|
|
|
|
for_each_available_child_of_node(np, child) {
|
|
if (of_property_read_string(child, "label",
|
|
&pdata->leds[i].name))
|
|
pdata->leds[i].name = child->name;
|
|
of_property_read_u32(child, "type", &pdata->leds[i].type);
|
|
of_property_read_string(child, "linux,default-trigger",
|
|
&pdata->leds[i].default_trigger);
|
|
if (!of_property_read_string(child, "default-state", &state)) {
|
|
if (!strcmp(state, "on"))
|
|
pdata->leds[i].state = PCA9532_ON;
|
|
else if (!strcmp(state, "keep"))
|
|
pdata->leds[i].state = PCA9532_KEEP;
|
|
}
|
|
if (++i >= maxleds) {
|
|
of_node_put(child);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return pdata;
|
|
}
|
|
|
|
static int pca9532_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int devid;
|
|
struct pca9532_data *data = i2c_get_clientdata(client);
|
|
struct pca9532_platform_data *pca9532_pdata =
|
|
dev_get_platdata(&client->dev);
|
|
struct device_node *np = dev_of_node(&client->dev);
|
|
|
|
if (!pca9532_pdata) {
|
|
if (np) {
|
|
pca9532_pdata =
|
|
pca9532_of_populate_pdata(&client->dev, np);
|
|
if (IS_ERR(pca9532_pdata))
|
|
return PTR_ERR(pca9532_pdata);
|
|
} else {
|
|
dev_err(&client->dev, "no platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
devid = (int)(uintptr_t)of_device_get_match_data(&client->dev);
|
|
} else {
|
|
devid = id->driver_data;
|
|
}
|
|
|
|
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[devid];
|
|
|
|
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);
|
|
|
|
pca9532_destroy_devices(data, data->chip_info->num_leds);
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_i2c_driver(pca9532_driver);
|
|
|
|
MODULE_AUTHOR("Riku Voipio");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
|