474 lines
12 KiB
C
474 lines
12 KiB
C
/*
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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 <ricardo.ribalda@gmail.com>
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*
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* Based on leds-pca955x.c
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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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/workqueue.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/platform_data/leds-pca963x.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_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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};
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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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enum pca963x_cmd {
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BRIGHTNESS_SET,
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BLINK_SET,
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};
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struct pca963x_led;
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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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struct pca963x_led *leds;
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};
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struct pca963x_led {
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struct pca963x *chip;
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struct work_struct work;
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enum led_brightness brightness;
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struct led_classdev led_cdev;
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int led_num; /* 0 .. 15 potentially */
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enum pca963x_cmd cmd;
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char name[32];
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u8 gdc;
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u8 gfrq;
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};
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static void pca963x_brightness_work(struct pca963x_led *pca963x)
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{
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u8 ledout_addr = pca963x->chip->chipdef->ledout_base
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+ (pca963x->led_num / 4);
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u8 ledout;
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int shift = 2 * (pca963x->led_num % 4);
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u8 mask = 0x3 << shift;
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mutex_lock(&pca963x->chip->mutex);
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ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
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switch (pca963x->brightness) {
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case LED_FULL:
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i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
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(ledout & ~mask) | (PCA963X_LED_ON << shift));
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break;
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case LED_OFF:
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i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
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ledout & ~mask);
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break;
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default:
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i2c_smbus_write_byte_data(pca963x->chip->client,
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PCA963X_PWM_BASE + pca963x->led_num,
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pca963x->brightness);
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i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
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(ledout & ~mask) | (PCA963X_LED_PWM << shift));
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break;
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}
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mutex_unlock(&pca963x->chip->mutex);
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}
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static void pca963x_blink_work(struct pca963x_led *pca963x)
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{
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u8 ledout_addr = pca963x->chip->chipdef->ledout_base +
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(pca963x->led_num / 4);
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u8 ledout;
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u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
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PCA963X_MODE2);
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int shift = 2 * (pca963x->led_num % 4);
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u8 mask = 0x3 << shift;
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i2c_smbus_write_byte_data(pca963x->chip->client,
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pca963x->chip->chipdef->grppwm, pca963x->gdc);
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i2c_smbus_write_byte_data(pca963x->chip->client,
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pca963x->chip->chipdef->grpfreq, pca963x->gfrq);
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if (!(mode2 & PCA963X_MODE2_DMBLNK))
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i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
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mode2 | PCA963X_MODE2_DMBLNK);
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mutex_lock(&pca963x->chip->mutex);
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ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
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if ((ledout & mask) != (PCA963X_LED_GRP_PWM << shift))
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i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
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(ledout & ~mask) | (PCA963X_LED_GRP_PWM << shift));
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mutex_unlock(&pca963x->chip->mutex);
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}
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static void pca963x_work(struct work_struct *work)
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{
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struct pca963x_led *pca963x = container_of(work,
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struct pca963x_led, work);
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switch (pca963x->cmd) {
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case BRIGHTNESS_SET:
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pca963x_brightness_work(pca963x);
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break;
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case BLINK_SET:
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pca963x_blink_work(pca963x);
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break;
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}
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}
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static void 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 *pca963x;
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pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
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pca963x->cmd = BRIGHTNESS_SET;
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pca963x->brightness = value;
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/*
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* Must use workqueue for the actual I/O since I2C operations
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* can sleep.
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*/
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schedule_work(&pca963x->work);
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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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struct pca963x_led *pca963x;
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unsigned long time_on, time_off, period;
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u8 gdc, gfrq;
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pca963x = 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 = 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 = time_on + time_off;
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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 = (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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pca963x->cmd = BLINK_SET;
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pca963x->gdc = gdc;
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pca963x->gfrq = gfrq;
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/*
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* Must use workqueue for the actual I/O since I2C operations
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* can sleep.
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*/
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schedule_work(&pca963x->work);
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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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#if IS_ENABLED(CONFIG_OF)
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static struct pca963x_platform_data *
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pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
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{
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struct device_node *np = client->dev.of_node, *child;
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struct pca963x_platform_data *pdata;
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struct led_info *pca963x_leds;
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int count;
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count = of_get_child_count(np);
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if (!count || count > chip->n_leds)
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return ERR_PTR(-ENODEV);
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pca963x_leds = devm_kzalloc(&client->dev,
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sizeof(struct led_info) * chip->n_leds, GFP_KERNEL);
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if (!pca963x_leds)
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return ERR_PTR(-ENOMEM);
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for_each_child_of_node(np, child) {
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struct led_info led = {};
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u32 reg;
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int res;
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res = of_property_read_u32(child, "reg", ®);
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if ((res != 0) || (reg >= chip->n_leds))
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continue;
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led.name =
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of_get_property(child, "label", NULL) ? : child->name;
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led.default_trigger =
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of_get_property(child, "linux,default-trigger", NULL);
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pca963x_leds[reg] = led;
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}
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pdata = devm_kzalloc(&client->dev,
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sizeof(struct pca963x_platform_data), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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pdata->leds.leds = pca963x_leds;
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pdata->leds.num_leds = chip->n_leds;
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/* default to open-drain unless totem pole (push-pull) is specified */
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if (of_property_read_bool(np, "nxp,totem-pole"))
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pdata->outdrv = PCA963X_TOTEM_POLE;
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else
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pdata->outdrv = PCA963X_OPEN_DRAIN;
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/* default to software blinking unless hardware blinking is specified */
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if (of_property_read_bool(np, "nxp,hw-blink"))
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pdata->blink_type = PCA963X_HW_BLINK;
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else
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pdata->blink_type = PCA963X_SW_BLINK;
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return pdata;
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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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#else
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static struct pca963x_platform_data *
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pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif
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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 pca963x *pca963x_chip;
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struct pca963x_led *pca963x;
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struct pca963x_platform_data *pdata;
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struct pca963x_chipdef *chip;
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int i, err;
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chip = &pca963x_chipdefs[id->driver_data];
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pdata = dev_get_platdata(&client->dev);
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if (!pdata) {
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pdata = pca963x_dt_init(client, chip);
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if (IS_ERR(pdata)) {
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dev_warn(&client->dev, "could not parse configuration\n");
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pdata = NULL;
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}
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}
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if (pdata && (pdata->leds.num_leds < 1 ||
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pdata->leds.num_leds > chip->n_leds)) {
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dev_err(&client->dev, "board info must claim 1-%d LEDs",
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chip->n_leds);
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return -EINVAL;
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}
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pca963x_chip = devm_kzalloc(&client->dev, sizeof(*pca963x_chip),
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GFP_KERNEL);
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if (!pca963x_chip)
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return -ENOMEM;
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pca963x = devm_kzalloc(&client->dev, chip->n_leds * sizeof(*pca963x),
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GFP_KERNEL);
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if (!pca963x)
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return -ENOMEM;
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i2c_set_clientdata(client, pca963x_chip);
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mutex_init(&pca963x_chip->mutex);
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pca963x_chip->chipdef = chip;
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pca963x_chip->client = client;
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pca963x_chip->leds = pca963x;
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/* Turn off LEDs by default*/
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for (i = 0; i < chip->n_leds / 4; i++)
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i2c_smbus_write_byte_data(client, chip->ledout_base + i, 0x00);
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for (i = 0; i < chip->n_leds; i++) {
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pca963x[i].led_num = i;
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pca963x[i].chip = pca963x_chip;
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/* Platform data can specify LED names and default triggers */
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if (pdata && i < pdata->leds.num_leds) {
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if (pdata->leds.leds[i].name)
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snprintf(pca963x[i].name,
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sizeof(pca963x[i].name), "pca963x:%s",
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pdata->leds.leds[i].name);
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if (pdata->leds.leds[i].default_trigger)
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pca963x[i].led_cdev.default_trigger =
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pdata->leds.leds[i].default_trigger;
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}
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if (!pdata || i >= pdata->leds.num_leds ||
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!pdata->leds.leds[i].name)
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snprintf(pca963x[i].name, sizeof(pca963x[i].name),
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"pca963x:%d:%.2x:%d", client->adapter->nr,
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client->addr, i);
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pca963x[i].led_cdev.name = pca963x[i].name;
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pca963x[i].led_cdev.brightness_set = pca963x_led_set;
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if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
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pca963x[i].led_cdev.blink_set = pca963x_blink_set;
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INIT_WORK(&pca963x[i].work, pca963x_work);
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err = led_classdev_register(&client->dev, &pca963x[i].led_cdev);
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if (err < 0)
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goto exit;
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}
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/* Disable LED all-call address and set normal mode */
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i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);
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if (pdata) {
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/* Configure output: open-drain or totem pole (push-pull) */
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if (pdata->outdrv == PCA963X_OPEN_DRAIN)
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i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);
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else
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i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x05);
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}
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return 0;
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exit:
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while (i--) {
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led_classdev_unregister(&pca963x[i].led_cdev);
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cancel_work_sync(&pca963x[i].work);
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}
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return err;
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}
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static int pca963x_remove(struct i2c_client *client)
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{
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struct pca963x *pca963x = i2c_get_clientdata(client);
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int i;
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for (i = 0; i < pca963x->chipdef->n_leds; i++) {
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led_classdev_unregister(&pca963x->leds[i].led_cdev);
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cancel_work_sync(&pca963x->leds[i].work);
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}
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return 0;
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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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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_pca963x_match),
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},
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.probe = pca963x_probe,
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.remove = pca963x_remove,
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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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