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564ead1280
By using struct led_init_data when registering we do not need to parse `label` DT property. Moreover `label` is deprecated and if it is not present but `color` and `function` are, LED core will compose a name from these properties instead. Previously if the `label` DT property was not present, the code composed name for the LED in the form "pca963x:%d:%.2x:%u" For backwards compatibility we therefore set init_data->default_label to this value so that the LED will not get a different name if `label` property is not present, nor are `color` and `function`. Signed-off-by: Marek Behún <marek.behun@nic.cz> Cc: Peter Meerwald <p.meerwald@bct-electronic.com> Cc: Ricardo Ribalda <ribalda@kernel.org> Cc: Zahari Petkov <zahari@balena.io> Signed-off-by: Pavel Machek <pavel@ucw.cz>
425 lines
11 KiB
C
425 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2011 bct electronic GmbH
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* Copyright 2013 Qtechnology/AS
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*
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* Author: Peter Meerwald <p.meerwald@bct-electronic.com>
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* Author: Ricardo Ribalda <ribalda@kernel.org>
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*
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* Based on leds-pca955x.c
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*
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* LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
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* LED driver for the PCA9634/5 I2C LED driver (7-bit slave address set by hw.)
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*
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* Note that hardware blinking violates the leds infrastructure driver
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* interface since the hardware only supports blinking all LEDs with the
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* same delay_on/delay_off rates. That is, only the LEDs that are set to
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* blink will actually blink but all LEDs that are set to blink will blink
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* in identical fashion. The delay_on/delay_off values of the last LED
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* that is set to blink will be used for all of the blinking LEDs.
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* Hardware blinking is disabled by default but can be enabled by setting
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* the 'blink_type' member in the platform_data struct to 'PCA963X_HW_BLINK'
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* or by adding the 'nxp,hw-blink' property to the DTS.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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/* LED select registers determine the source that drives LED outputs */
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#define PCA963X_LED_OFF 0x0 /* LED driver off */
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#define PCA963X_LED_ON 0x1 /* LED driver on */
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#define PCA963X_LED_PWM 0x2 /* Controlled through PWM */
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#define PCA963X_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
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#define PCA963X_MODE2_OUTDRV 0x04 /* Open-drain or totem pole */
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#define PCA963X_MODE2_INVRT 0x10 /* Normal or inverted direction */
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#define PCA963X_MODE2_DMBLNK 0x20 /* Enable blinking */
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#define PCA963X_MODE1 0x00
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#define PCA963X_MODE2 0x01
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#define PCA963X_PWM_BASE 0x02
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enum pca963x_type {
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pca9633,
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pca9634,
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pca9635,
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};
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struct pca963x_chipdef {
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u8 grppwm;
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u8 grpfreq;
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u8 ledout_base;
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int n_leds;
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unsigned int scaling;
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};
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static struct pca963x_chipdef pca963x_chipdefs[] = {
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[pca9633] = {
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.grppwm = 0x6,
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.grpfreq = 0x7,
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.ledout_base = 0x8,
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.n_leds = 4,
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},
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[pca9634] = {
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.grppwm = 0xa,
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.grpfreq = 0xb,
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.ledout_base = 0xc,
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.n_leds = 8,
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},
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[pca9635] = {
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.grppwm = 0x12,
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.grpfreq = 0x13,
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.ledout_base = 0x14,
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.n_leds = 16,
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},
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};
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/* Total blink period in milliseconds */
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#define PCA963X_BLINK_PERIOD_MIN 42
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#define PCA963X_BLINK_PERIOD_MAX 10667
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static const struct i2c_device_id pca963x_id[] = {
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{ "pca9632", pca9633 },
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{ "pca9633", pca9633 },
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{ "pca9634", pca9634 },
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{ "pca9635", pca9635 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca963x_id);
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struct pca963x;
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struct pca963x_led {
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struct pca963x *chip;
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struct led_classdev led_cdev;
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int led_num; /* 0 .. 15 potentially */
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u8 gdc;
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u8 gfrq;
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};
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struct pca963x {
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struct pca963x_chipdef *chipdef;
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struct mutex mutex;
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struct i2c_client *client;
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unsigned long leds_on;
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struct pca963x_led leds[];
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};
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static int pca963x_brightness(struct pca963x_led *led,
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enum led_brightness brightness)
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{
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struct i2c_client *client = led->chip->client;
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struct pca963x_chipdef *chipdef = led->chip->chipdef;
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u8 ledout_addr, ledout, mask, val;
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int shift;
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int ret;
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ledout_addr = chipdef->ledout_base + (led->led_num / 4);
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shift = 2 * (led->led_num % 4);
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mask = 0x3 << shift;
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ledout = i2c_smbus_read_byte_data(client, ledout_addr);
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switch (brightness) {
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case LED_FULL:
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val = (ledout & ~mask) | (PCA963X_LED_ON << shift);
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ret = i2c_smbus_write_byte_data(client, ledout_addr, val);
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break;
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case LED_OFF:
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val = ledout & ~mask;
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ret = i2c_smbus_write_byte_data(client, ledout_addr, val);
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break;
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default:
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ret = i2c_smbus_write_byte_data(client,
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PCA963X_PWM_BASE +
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led->led_num,
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brightness);
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if (ret < 0)
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return ret;
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val = (ledout & ~mask) | (PCA963X_LED_PWM << shift);
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ret = i2c_smbus_write_byte_data(client, ledout_addr, val);
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break;
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}
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return ret;
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}
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static void pca963x_blink(struct pca963x_led *led)
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{
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struct i2c_client *client = led->chip->client;
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struct pca963x_chipdef *chipdef = led->chip->chipdef;
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u8 ledout_addr, ledout, mask, val, mode2;
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int shift;
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ledout_addr = chipdef->ledout_base + (led->led_num / 4);
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shift = 2 * (led->led_num % 4);
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mask = 0x3 << shift;
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mode2 = i2c_smbus_read_byte_data(client, PCA963X_MODE2);
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i2c_smbus_write_byte_data(client, chipdef->grppwm, led->gdc);
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i2c_smbus_write_byte_data(client, chipdef->grpfreq, led->gfrq);
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if (!(mode2 & PCA963X_MODE2_DMBLNK))
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i2c_smbus_write_byte_data(client, PCA963X_MODE2,
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mode2 | PCA963X_MODE2_DMBLNK);
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mutex_lock(&led->chip->mutex);
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ledout = i2c_smbus_read_byte_data(client, ledout_addr);
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if ((ledout & mask) != (PCA963X_LED_GRP_PWM << shift)) {
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val = (ledout & ~mask) | (PCA963X_LED_GRP_PWM << shift);
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i2c_smbus_write_byte_data(client, ledout_addr, val);
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}
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mutex_unlock(&led->chip->mutex);
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}
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static int pca963x_power_state(struct pca963x_led *led)
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{
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struct i2c_client *client = led->chip->client;
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unsigned long *leds_on = &led->chip->leds_on;
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unsigned long cached_leds = *leds_on;
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if (led->led_cdev.brightness)
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set_bit(led->led_num, leds_on);
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else
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clear_bit(led->led_num, leds_on);
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if (!(*leds_on) != !cached_leds)
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return i2c_smbus_write_byte_data(client, PCA963X_MODE1,
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*leds_on ? 0 : BIT(4));
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return 0;
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}
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static int pca963x_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca963x_led *led;
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int ret;
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led = container_of(led_cdev, struct pca963x_led, led_cdev);
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mutex_lock(&led->chip->mutex);
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ret = pca963x_brightness(led, value);
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if (ret < 0)
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goto unlock;
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ret = pca963x_power_state(led);
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unlock:
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mutex_unlock(&led->chip->mutex);
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return ret;
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}
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static unsigned int pca963x_period_scale(struct pca963x_led *led,
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unsigned int val)
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{
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unsigned int scaling = led->chip->chipdef->scaling;
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return scaling ? DIV_ROUND_CLOSEST(val * scaling, 1000) : val;
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}
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static int pca963x_blink_set(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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unsigned long time_on, time_off, period;
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struct pca963x_led *led;
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u8 gdc, gfrq;
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led = container_of(led_cdev, struct pca963x_led, led_cdev);
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time_on = *delay_on;
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time_off = *delay_off;
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/* If both zero, pick reasonable defaults of 500ms each */
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if (!time_on && !time_off) {
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time_on = 500;
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time_off = 500;
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}
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period = pca963x_period_scale(led, time_on + time_off);
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/* If period not supported by hardware, default to someting sane. */
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if ((period < PCA963X_BLINK_PERIOD_MIN) ||
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(period > PCA963X_BLINK_PERIOD_MAX)) {
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time_on = 500;
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time_off = 500;
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period = pca963x_period_scale(led, 1000);
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}
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/*
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* From manual: duty cycle = (GDC / 256) ->
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* (time_on / period) = (GDC / 256) ->
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* GDC = ((time_on * 256) / period)
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*/
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gdc = (pca963x_period_scale(led, time_on) * 256) / period;
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/*
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* From manual: period = ((GFRQ + 1) / 24) in seconds.
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* So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->
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* GFRQ = ((period * 24 / 1000) - 1)
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*/
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gfrq = (period * 24 / 1000) - 1;
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led->gdc = gdc;
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led->gfrq = gfrq;
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pca963x_blink(led);
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*delay_on = time_on;
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*delay_off = time_off;
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return 0;
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}
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static int pca963x_register_leds(struct i2c_client *client,
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struct pca963x *chip)
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{
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struct pca963x_chipdef *chipdef = chip->chipdef;
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struct pca963x_led *led = chip->leds;
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struct device *dev = &client->dev;
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struct fwnode_handle *child;
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bool hw_blink;
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s32 mode2;
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u32 reg;
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int ret;
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if (device_property_read_u32(dev, "nxp,period-scale",
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&chipdef->scaling))
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chipdef->scaling = 1000;
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hw_blink = device_property_read_bool(dev, "nxp,hw-blink");
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mode2 = i2c_smbus_read_byte_data(client, PCA963X_MODE2);
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if (mode2 < 0)
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return mode2;
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/* default to open-drain unless totem pole (push-pull) is specified */
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if (device_property_read_bool(dev, "nxp,totem-pole"))
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mode2 |= PCA963X_MODE2_OUTDRV;
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else
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mode2 &= ~PCA963X_MODE2_OUTDRV;
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/* default to non-inverted output, unless inverted is specified */
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if (device_property_read_bool(dev, "nxp,inverted-out"))
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mode2 |= PCA963X_MODE2_INVRT;
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else
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mode2 &= ~PCA963X_MODE2_INVRT;
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ret = i2c_smbus_write_byte_data(client, PCA963X_MODE2, mode2);
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if (ret < 0)
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return ret;
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device_for_each_child_node(dev, child) {
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struct led_init_data init_data = {};
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char default_label[32];
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ret = fwnode_property_read_u32(child, "reg", ®);
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if (ret || reg >= chipdef->n_leds) {
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dev_err(dev, "Invalid 'reg' property for node %pfw\n",
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child);
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ret = -EINVAL;
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goto err;
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}
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led->led_num = reg;
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led->chip = chip;
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led->led_cdev.brightness_set_blocking = pca963x_led_set;
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if (hw_blink)
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led->led_cdev.blink_set = pca963x_blink_set;
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init_data.fwnode = child;
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/* for backwards compatibility */
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init_data.devicename = "pca963x";
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snprintf(default_label, sizeof(default_label), "%d:%.2x:%u",
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client->adapter->nr, client->addr, reg);
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init_data.default_label = default_label;
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ret = devm_led_classdev_register_ext(dev, &led->led_cdev,
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&init_data);
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if (ret) {
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dev_err(dev, "Failed to register LED for node %pfw\n",
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child);
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goto err;
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}
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++led;
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}
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return 0;
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err:
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fwnode_handle_put(child);
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return ret;
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}
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static const struct of_device_id of_pca963x_match[] = {
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{ .compatible = "nxp,pca9632", },
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{ .compatible = "nxp,pca9633", },
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{ .compatible = "nxp,pca9634", },
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{ .compatible = "nxp,pca9635", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_pca963x_match);
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static int pca963x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct pca963x_chipdef *chipdef;
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struct pca963x *chip;
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int i, count;
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chipdef = &pca963x_chipdefs[id->driver_data];
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count = device_get_child_node_count(dev);
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if (!count || count > chipdef->n_leds) {
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dev_err(dev, "Node %pfw must define between 1 and %d LEDs\n",
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dev_fwnode(dev), chipdef->n_leds);
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return -EINVAL;
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}
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chip = devm_kzalloc(dev, struct_size(chip, leds, count), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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i2c_set_clientdata(client, chip);
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mutex_init(&chip->mutex);
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chip->chipdef = chipdef;
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chip->client = client;
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/* Turn off LEDs by default*/
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for (i = 0; i < chipdef->n_leds / 4; i++)
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i2c_smbus_write_byte_data(client, chipdef->ledout_base + i, 0x00);
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/* Disable LED all-call address, and power down initially */
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i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
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return pca963x_register_leds(client, chip);
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}
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static struct i2c_driver pca963x_driver = {
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.driver = {
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.name = "leds-pca963x",
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.of_match_table = of_pca963x_match,
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},
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.probe = pca963x_probe,
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.id_table = pca963x_id,
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};
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module_i2c_driver(pca963x_driver);
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MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
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MODULE_DESCRIPTION("PCA963X LED driver");
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MODULE_LICENSE("GPL v2");
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