2012-03-23 16:02:10 -06:00
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/*
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* Copyright 2011 bct electronic GmbH
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*
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* Author: Peter Meerwald <p.meerwald@bct-electronic.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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*
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2013-07-25 11:16:41 -06:00
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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 'PCA9633_HW_BLINK'
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* or by adding the 'nxp,hw-blink' property to the DTS.
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2012-03-23 16:02:10 -06:00
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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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2013-06-26 06:52:49 -06:00
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#include <linux/of.h>
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2012-09-24 00:53:49 -06:00
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#include <linux/platform_data/leds-pca9633.h>
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2012-03-23 16:02:10 -06:00
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/* LED select registers determine the source that drives LED outputs */
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#define PCA9633_LED_OFF 0x0 /* LED driver off */
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#define PCA9633_LED_ON 0x1 /* LED driver on */
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#define PCA9633_LED_PWM 0x2 /* Controlled through PWM */
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#define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
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2013-07-25 11:16:41 -06:00
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#define PCA9633_MODE2_DMBLNK 0x20 /* Enable blinking */
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2012-03-23 16:02:10 -06:00
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#define PCA9633_MODE1 0x00
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#define PCA9633_MODE2 0x01
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#define PCA9633_PWM_BASE 0x02
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2013-07-25 11:16:41 -06:00
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#define PCA9633_GRPPWM 0x06
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#define PCA9633_GRPFREQ 0x07
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2012-03-23 16:02:10 -06:00
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#define PCA9633_LEDOUT 0x08
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2013-07-25 11:16:41 -06:00
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/* Total blink period in milliseconds */
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#define PCA9632_BLINK_PERIOD_MIN 42
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#define PCA9632_BLINK_PERIOD_MAX 10667
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2012-03-23 16:02:10 -06:00
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static const struct i2c_device_id pca9633_id[] = {
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{ "pca9633", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9633_id);
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2013-07-25 11:16:41 -06:00
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enum pca9633_cmd {
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BRIGHTNESS_SET,
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BLINK_SET,
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};
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2012-03-23 16:02:10 -06:00
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struct pca9633_led {
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struct i2c_client *client;
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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 .. 3 potentially */
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2013-07-25 11:16:41 -06:00
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enum pca9633_cmd cmd;
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2012-03-23 16:02:10 -06:00
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char name[32];
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2013-07-25 11:16:41 -06:00
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u8 gdc;
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u8 gfrq;
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2012-03-23 16:02:10 -06:00
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};
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2013-07-25 11:16:41 -06:00
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static void pca9633_brightness_work(struct pca9633_led *pca9633)
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2012-03-23 16:02:10 -06:00
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{
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u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT);
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int shift = 2 * pca9633->led_num;
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u8 mask = 0x3 << shift;
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switch (pca9633->brightness) {
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case LED_FULL:
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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(ledout & ~mask) | (PCA9633_LED_ON << shift));
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break;
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case LED_OFF:
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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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(pca9633->client,
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PCA9633_PWM_BASE + pca9633->led_num,
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pca9633->brightness);
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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(ledout & ~mask) | (PCA9633_LED_PWM << shift));
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break;
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}
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}
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2013-07-25 11:16:41 -06:00
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static void pca9633_blink_work(struct pca9633_led *pca9633)
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{
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u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT);
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u8 mode2 = i2c_smbus_read_byte_data(pca9633->client, PCA9633_MODE2);
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int shift = 2 * pca9633->led_num;
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u8 mask = 0x3 << shift;
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_GRPPWM,
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pca9633->gdc);
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_GRPFREQ,
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pca9633->gfrq);
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if (!(mode2 & PCA9633_MODE2_DMBLNK))
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_MODE2,
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mode2 | PCA9633_MODE2_DMBLNK);
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if ((ledout & mask) != (PCA9633_LED_GRP_PWM << shift))
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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(ledout & ~mask) | (PCA9633_LED_GRP_PWM << shift));
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}
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static void pca9633_work(struct work_struct *work)
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{
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struct pca9633_led *pca9633 = container_of(work,
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struct pca9633_led, work);
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switch (pca9633->cmd) {
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case BRIGHTNESS_SET:
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pca9633_brightness_work(pca9633);
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break;
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case BLINK_SET:
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pca9633_blink_work(pca9633);
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break;
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}
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}
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2012-03-23 16:02:10 -06:00
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static void pca9633_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca9633_led *pca9633;
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pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev);
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2013-07-25 11:16:41 -06:00
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pca9633->cmd = BRIGHTNESS_SET;
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2012-03-23 16:02:10 -06:00
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pca9633->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(&pca9633->work);
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}
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2013-07-25 11:16:41 -06:00
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static int pca9633_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 pca9633_led *pca9633;
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unsigned long time_on, time_off, period;
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u8 gdc, gfrq;
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pca9633 = container_of(led_cdev, struct pca9633_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 < PCA9632_BLINK_PERIOD_MIN) ||
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(period > PCA9632_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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pca9633->cmd = BLINK_SET;
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pca9633->gdc = gdc;
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pca9633->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(&pca9633->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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2013-06-26 06:52:49 -06:00
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#if IS_ENABLED(CONFIG_OF)
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static struct pca9633_platform_data *
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pca9633_dt_init(struct i2c_client *client)
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{
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struct device_node *np = client->dev.of_node, *child;
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struct pca9633_platform_data *pdata;
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struct led_info *pca9633_leds;
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int count;
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count = of_get_child_count(np);
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if (!count || count > 4)
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return ERR_PTR(-ENODEV);
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pca9633_leds = devm_kzalloc(&client->dev,
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sizeof(struct led_info) * count, GFP_KERNEL);
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if (!pca9633_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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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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res = of_property_read_u32(child, "reg", ®);
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if (res != 0)
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continue;
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pca9633_leds[reg] = led;
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}
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pdata = devm_kzalloc(&client->dev,
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sizeof(struct pca9633_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 = pca9633_leds;
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pdata->leds.num_leds = count;
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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 = PCA9633_TOTEM_POLE;
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else
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pdata->outdrv = PCA9633_OPEN_DRAIN;
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2013-07-25 11:16:41 -06:00
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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 = PCA9633_HW_BLINK;
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else
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pdata->blink_type = PCA9633_SW_BLINK;
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2013-06-26 06:52:49 -06:00
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return pdata;
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}
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static const struct of_device_id of_pca9633_match[] = {
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{ .compatible = "nxp,pca963x", },
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{},
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};
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#else
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static struct pca9633_platform_data *
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pca9633_dt_init(struct i2c_client *client)
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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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2012-11-19 11:23:02 -07:00
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static int pca9633_probe(struct i2c_client *client,
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2012-03-23 16:02:10 -06:00
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const struct i2c_device_id *id)
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{
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struct pca9633_led *pca9633;
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2012-09-24 00:53:49 -06:00
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struct pca9633_platform_data *pdata;
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2012-03-23 16:02:10 -06:00
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int i, err;
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2013-07-30 02:07:35 -06:00
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pdata = dev_get_platdata(&client->dev);
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2012-03-23 16:02:10 -06:00
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2013-06-26 06:52:49 -06:00
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if (!pdata) {
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pdata = pca9633_dt_init(client);
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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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2012-03-23 16:02:10 -06:00
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if (pdata) {
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2012-09-24 00:53:49 -06:00
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if (pdata->leds.num_leds <= 0 || pdata->leds.num_leds > 4) {
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2012-03-23 16:02:10 -06:00
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dev_err(&client->dev, "board info must claim at most 4 LEDs");
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return -EINVAL;
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}
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}
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2012-07-03 21:40:10 -06:00
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pca9633 = devm_kzalloc(&client->dev, 4 * sizeof(*pca9633), GFP_KERNEL);
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2012-03-23 16:02:10 -06:00
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if (!pca9633)
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return -ENOMEM;
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i2c_set_clientdata(client, pca9633);
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for (i = 0; i < 4; i++) {
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pca9633[i].client = client;
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pca9633[i].led_num = i;
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/* Platform data can specify LED names and default triggers */
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2012-09-24 00:53:49 -06:00
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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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2012-03-23 16:02:10 -06:00
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snprintf(pca9633[i].name,
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sizeof(pca9633[i].name), "pca9633:%s",
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2012-09-24 00:53:49 -06:00
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pdata->leds.leds[i].name);
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if (pdata->leds.leds[i].default_trigger)
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2012-03-23 16:02:10 -06:00
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pca9633[i].led_cdev.default_trigger =
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2012-09-24 00:53:49 -06:00
|
|
|
pdata->leds.leds[i].default_trigger;
|
2012-03-23 16:02:10 -06:00
|
|
|
} else {
|
|
|
|
snprintf(pca9633[i].name, sizeof(pca9633[i].name),
|
|
|
|
"pca9633:%d", i);
|
|
|
|
}
|
|
|
|
|
|
|
|
pca9633[i].led_cdev.name = pca9633[i].name;
|
|
|
|
pca9633[i].led_cdev.brightness_set = pca9633_led_set;
|
|
|
|
|
2013-07-25 11:16:41 -06:00
|
|
|
if (pdata && pdata->blink_type == PCA9633_HW_BLINK)
|
|
|
|
pca9633[i].led_cdev.blink_set = pca9633_blink_set;
|
|
|
|
|
|
|
|
INIT_WORK(&pca9633[i].work, pca9633_work);
|
2012-03-23 16:02:10 -06:00
|
|
|
|
|
|
|
err = led_classdev_register(&client->dev, &pca9633[i].led_cdev);
|
|
|
|
if (err < 0)
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Disable LED all-call address and set normal mode */
|
|
|
|
i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00);
|
|
|
|
|
2012-09-24 00:53:49 -06:00
|
|
|
/* Configure output: open-drain or totem pole (push-pull) */
|
|
|
|
if (pdata && pdata->outdrv == PCA9633_OPEN_DRAIN)
|
|
|
|
i2c_smbus_write_byte_data(client, PCA9633_MODE2, 0x01);
|
|
|
|
|
2012-03-23 16:02:10 -06:00
|
|
|
/* Turn off LEDs */
|
|
|
|
i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
exit:
|
|
|
|
while (i--) {
|
|
|
|
led_classdev_unregister(&pca9633[i].led_cdev);
|
|
|
|
cancel_work_sync(&pca9633[i].work);
|
|
|
|
}
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2012-11-19 11:26:00 -07:00
|
|
|
static int pca9633_remove(struct i2c_client *client)
|
2012-03-23 16:02:10 -06:00
|
|
|
{
|
|
|
|
struct pca9633_led *pca9633 = i2c_get_clientdata(client);
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
|
|
led_classdev_unregister(&pca9633[i].led_cdev);
|
|
|
|
cancel_work_sync(&pca9633[i].work);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct i2c_driver pca9633_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "leds-pca9633",
|
|
|
|
.owner = THIS_MODULE,
|
2013-06-26 06:52:49 -06:00
|
|
|
.of_match_table = of_match_ptr(of_pca9633_match),
|
2012-03-23 16:02:10 -06:00
|
|
|
},
|
|
|
|
.probe = pca9633_probe,
|
2012-11-19 11:20:20 -07:00
|
|
|
.remove = pca9633_remove,
|
2012-03-23 16:02:10 -06:00
|
|
|
.id_table = pca9633_id,
|
|
|
|
};
|
|
|
|
|
|
|
|
module_i2c_driver(pca9633_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
|
|
|
|
MODULE_DESCRIPTION("PCA9633 LED driver");
|
|
|
|
MODULE_LICENSE("GPL v2");
|