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![Stefan Riedmueller](/assets/img/avatar_default.png)
When using devicetree, gpio_base holds its initial zero value which can lead to a rejection if another gpio controller already occupies this base. To prevent that collision let the gpio base be assigned dynamically. Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de> Signed-off-by: Pavel Machek <pavel@ucw.cz>
565 lines
14 KiB
C
565 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 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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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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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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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;
|
|
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);
|
|
|
|
return pca9532_destroy_devices(data, data->chip_info->num_leds);
|
|
}
|
|
|
|
module_i2c_driver(pca9532_driver);
|
|
|
|
MODULE_AUTHOR("Riku Voipio");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
|