607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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* lp5523.c - LP5523 LED Driver
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/ctype.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/leds.h>
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#include <linux/leds-lp5523.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include <linux/firmware.h>
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#include "leds-lp55xx-common.h"
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#define LP5523_REG_ENABLE 0x00
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#define LP5523_REG_OP_MODE 0x01
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#define LP5523_REG_RATIOMETRIC_MSB 0x02
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#define LP5523_REG_RATIOMETRIC_LSB 0x03
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#define LP5523_REG_ENABLE_LEDS_MSB 0x04
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#define LP5523_REG_ENABLE_LEDS_LSB 0x05
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#define LP5523_REG_LED_CNTRL_BASE 0x06
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#define LP5523_REG_LED_PWM_BASE 0x16
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#define LP5523_REG_LED_CURRENT_BASE 0x26
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#define LP5523_REG_CONFIG 0x36
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#define LP5523_REG_CHANNEL1_PC 0x37
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#define LP5523_REG_CHANNEL2_PC 0x38
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#define LP5523_REG_CHANNEL3_PC 0x39
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#define LP5523_REG_STATUS 0x3a
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#define LP5523_REG_GPO 0x3b
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#define LP5523_REG_VARIABLE 0x3c
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#define LP5523_REG_RESET 0x3d
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#define LP5523_REG_TEMP_CTRL 0x3e
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#define LP5523_REG_TEMP_READ 0x3f
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#define LP5523_REG_TEMP_WRITE 0x40
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#define LP5523_REG_LED_TEST_CTRL 0x41
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#define LP5523_REG_LED_TEST_ADC 0x42
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#define LP5523_REG_ENG1_VARIABLE 0x45
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#define LP5523_REG_ENG2_VARIABLE 0x46
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#define LP5523_REG_ENG3_VARIABLE 0x47
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#define LP5523_REG_MASTER_FADER1 0x48
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#define LP5523_REG_MASTER_FADER2 0x49
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#define LP5523_REG_MASTER_FADER3 0x4a
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#define LP5523_REG_CH1_PROG_START 0x4c
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#define LP5523_REG_CH2_PROG_START 0x4d
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#define LP5523_REG_CH3_PROG_START 0x4e
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#define LP5523_REG_PROG_PAGE_SEL 0x4f
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#define LP5523_REG_PROG_MEM 0x50
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#define LP5523_CMD_LOAD 0x15 /* 00010101 */
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#define LP5523_CMD_RUN 0x2a /* 00101010 */
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#define LP5523_CMD_DISABLED 0x00 /* 00000000 */
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#define LP5523_ENABLE 0x40
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#define LP5523_AUTO_INC 0x40
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#define LP5523_PWR_SAVE 0x20
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#define LP5523_PWM_PWR_SAVE 0x04
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#define LP5523_CP_1 0x08
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#define LP5523_CP_1_5 0x10
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#define LP5523_CP_AUTO 0x18
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#define LP5523_INT_CLK 0x01
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#define LP5523_AUTO_CLK 0x02
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#define LP5523_EN_LEDTEST 0x80
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#define LP5523_LEDTEST_DONE 0x80
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#define LP5523_RESET 0xFF
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#define LP5523_DEFAULT_CURRENT 50 /* microAmps */
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#define LP5523_PROGRAM_LENGTH 32 /* in bytes */
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#define LP5523_PROGRAM_PAGES 6
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#define LP5523_ADC_SHORTCIRC_LIM 80
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#define LP5523_MAX_LEDS 9
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#define LP5523_ENGINES 3
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#define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
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#define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
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#define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
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#define LP5523_EXT_CLK_USED 0x08
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#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
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#define SHIFT_MASK(id) (((id) - 1) * 2)
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/* Memory Page Selection */
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#define LP5523_PAGE_ENG1 0
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#define LP5523_PAGE_ENG2 1
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#define LP5523_PAGE_ENG3 2
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/* Program Memory Operations */
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#define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
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#define LP5523_MODE_ENG2_M 0x0C
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#define LP5523_MODE_ENG3_M 0x03
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#define LP5523_LOAD_ENG1 0x10
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#define LP5523_LOAD_ENG2 0x04
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#define LP5523_LOAD_ENG3 0x01
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#define LP5523_ENG1_IS_LOADING(mode) \
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((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
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#define LP5523_ENG2_IS_LOADING(mode) \
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((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
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#define LP5523_ENG3_IS_LOADING(mode) \
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((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
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#define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */
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#define LP5523_EXEC_ENG2_M 0x0C
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#define LP5523_EXEC_ENG3_M 0x03
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#define LP5523_EXEC_M 0x3F
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#define LP5523_RUN_ENG1 0x20
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#define LP5523_RUN_ENG2 0x08
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#define LP5523_RUN_ENG3 0x02
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enum lp5523_chip_id {
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LP5523,
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LP55231,
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};
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struct lp5523_led {
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int id;
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u8 chan_nr;
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u8 led_current;
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u8 max_current;
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struct led_classdev cdev;
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struct work_struct brightness_work;
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u8 brightness;
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};
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struct lp5523_chip {
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struct mutex lock; /* Serialize control */
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struct i2c_client *client;
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struct lp5523_led leds[LP5523_MAX_LEDS];
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struct lp5523_platform_data *pdata;
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u8 num_channels;
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u8 num_leds;
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};
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static inline void lp5523_wait_opmode_done(void)
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{
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usleep_range(1000, 2000);
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}
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static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
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{
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led->led_current = led_current;
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lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
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led_current);
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}
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static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
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{
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
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{
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s32 ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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return ret;
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*buf = ret;
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return 0;
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}
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static int lp5523_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
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if (ret)
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return ret;
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/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
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usleep_range(1000, 2000);
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ret = lp55xx_write(chip, LP5523_REG_CONFIG,
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LP5523_AUTO_INC | LP5523_PWR_SAVE |
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LP5523_CP_AUTO | LP5523_AUTO_CLK |
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LP5523_PWM_PWR_SAVE);
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if (ret)
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return ret;
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/* turn on all leds */
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ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
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if (ret)
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return ret;
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return lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
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}
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static void lp5523_load_engine(struct lp55xx_chip *chip)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 mask[] = {
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[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
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[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
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[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
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};
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u8 val[] = {
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[LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
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[LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
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[LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
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};
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u8 page_sel[] = {
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[LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
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[LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
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[LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
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};
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lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
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lp5523_wait_opmode_done();
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lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
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}
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static void lp5523_stop_engine(struct lp55xx_chip *chip)
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{
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lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
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lp5523_wait_opmode_done();
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}
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static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
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{
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int i;
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for (i = 0; i < LP5523_MAX_LEDS; i++)
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lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
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}
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static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
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{
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int ret;
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u8 mode;
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u8 exec;
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/* stop engine */
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if (!start) {
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lp5523_stop_engine(chip);
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lp5523_turn_off_channels(chip);
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return;
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}
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/*
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* To run the engine,
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* operation mode and enable register should updated at the same time
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*/
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ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
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if (ret)
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return;
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ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
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if (ret)
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return;
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/* change operation mode to RUN only when each engine is loading */
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if (LP5523_ENG1_IS_LOADING(mode)) {
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mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
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exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
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}
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if (LP5523_ENG2_IS_LOADING(mode)) {
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mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
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exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
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}
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if (LP5523_ENG3_IS_LOADING(mode)) {
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mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
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exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
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}
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lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
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lp5523_wait_opmode_done();
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lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
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}
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static int lp5523_update_program_memory(struct lp55xx_chip *chip,
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const u8 *data, size_t size)
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{
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u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
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unsigned cmd;
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char c[3];
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int update_size;
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int nrchars;
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int offset = 0;
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int ret;
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int i;
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/* clear program memory before updating */
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for (i = 0; i < LP5523_PROGRAM_LENGTH; i++)
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lp55xx_write(chip, LP5523_REG_PROG_MEM + i, 0);
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i = 0;
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while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
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/* separate sscanfs because length is working only for %s */
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ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
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if (ret != 1)
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goto err;
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ret = sscanf(c, "%2x", &cmd);
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if (ret != 1)
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goto err;
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pattern[i] = (u8)cmd;
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offset += nrchars;
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i++;
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}
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/* Each instruction is 16bit long. Check that length is even */
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if (i % 2)
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goto err;
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update_size = i;
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for (i = 0; i < update_size; i++)
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lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
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return 0;
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err:
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dev_err(&chip->cl->dev, "wrong pattern format\n");
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return -EINVAL;
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}
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static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
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{
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const struct firmware *fw = chip->fw;
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if (fw->size > LP5523_PROGRAM_LENGTH) {
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dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
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fw->size);
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return;
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}
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/*
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* Program momery sequence
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* 1) set engine mode to "LOAD"
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* 2) write firmware data into program memory
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*/
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lp5523_load_engine(chip);
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lp5523_update_program_memory(chip, fw->data, fw->size);
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}
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static ssize_t lp5523_selftest(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lp5523_chip *chip = i2c_get_clientdata(client);
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int i, ret, pos = 0;
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int led = 0;
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u8 status, adc, vdd;
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mutex_lock(&chip->lock);
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ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
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if (ret < 0)
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goto fail;
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/* Check that ext clock is really in use if requested */
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if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
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if ((status & LP5523_EXT_CLK_USED) == 0)
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goto fail;
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/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
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lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
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LP5523_EN_LEDTEST | 16);
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usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
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ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
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if (ret < 0)
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goto fail;
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if (!(status & LP5523_LEDTEST_DONE))
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usleep_range(3000, 6000); /* Was not ready. Wait little bit */
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ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
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if (ret < 0)
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goto fail;
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vdd--; /* There may be some fluctuation in measurement */
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for (i = 0; i < LP5523_MAX_LEDS; i++) {
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/* Skip non-existing channels */
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if (chip->pdata->led_config[i].led_current == 0)
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continue;
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/* Set default current */
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lp5523_write(chip->client,
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LP5523_REG_LED_CURRENT_BASE + i,
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chip->pdata->led_config[i].led_current);
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lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
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/* let current stabilize 2 - 4ms before measurements start */
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usleep_range(2000, 4000);
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lp5523_write(chip->client,
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LP5523_REG_LED_TEST_CTRL,
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LP5523_EN_LEDTEST | i);
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/* ADC conversion time is 2.7 ms typically */
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usleep_range(3000, 6000);
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ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
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if (ret < 0)
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goto fail;
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if (!(status & LP5523_LEDTEST_DONE))
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usleep_range(3000, 6000);/* Was not ready. Wait. */
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ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
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if (ret < 0)
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goto fail;
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if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
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pos += sprintf(buf + pos, "LED %d FAIL\n", i);
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lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
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/* Restore current */
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lp5523_write(chip->client,
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LP5523_REG_LED_CURRENT_BASE + i,
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chip->leds[led].led_current);
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led++;
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}
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if (pos == 0)
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pos = sprintf(buf, "OK\n");
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goto release_lock;
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fail:
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pos = sprintf(buf, "FAIL\n");
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release_lock:
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mutex_unlock(&chip->lock);
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return pos;
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}
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static void lp5523_led_brightness_work(struct work_struct *work)
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{
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struct lp55xx_led *led = container_of(work, struct lp55xx_led,
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brightness_work);
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struct lp55xx_chip *chip = led->chip;
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mutex_lock(&chip->lock);
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lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
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led->brightness);
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mutex_unlock(&chip->lock);
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}
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static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
|
|
|
|
static struct attribute *lp5523_attributes[] = {
|
|
&dev_attr_selftest.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group lp5523_group = {
|
|
.attrs = lp5523_attributes,
|
|
};
|
|
|
|
static void lp5523_unregister_sysfs(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
|
|
sysfs_remove_group(&dev->kobj, &lp5523_group);
|
|
}
|
|
|
|
/* Chip specific configurations */
|
|
static struct lp55xx_device_config lp5523_cfg = {
|
|
.reset = {
|
|
.addr = LP5523_REG_RESET,
|
|
.val = LP5523_RESET,
|
|
},
|
|
.enable = {
|
|
.addr = LP5523_REG_ENABLE,
|
|
.val = LP5523_ENABLE,
|
|
},
|
|
.max_channel = LP5523_MAX_LEDS,
|
|
.post_init_device = lp5523_post_init_device,
|
|
.brightness_work_fn = lp5523_led_brightness_work,
|
|
.set_led_current = lp5523_set_led_current,
|
|
.firmware_cb = lp5523_firmware_loaded,
|
|
.run_engine = lp5523_run_engine,
|
|
.dev_attr_group = &lp5523_group,
|
|
};
|
|
|
|
static int lp5523_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
struct lp55xx_chip *chip;
|
|
struct lp55xx_led *led;
|
|
struct lp55xx_platform_data *pdata = client->dev.platform_data;
|
|
|
|
if (!pdata) {
|
|
dev_err(&client->dev, "no platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
led = devm_kzalloc(&client->dev,
|
|
sizeof(*led) * pdata->num_channels, GFP_KERNEL);
|
|
if (!led)
|
|
return -ENOMEM;
|
|
|
|
chip->cl = client;
|
|
chip->pdata = pdata;
|
|
chip->cfg = &lp5523_cfg;
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
i2c_set_clientdata(client, led);
|
|
|
|
ret = lp55xx_init_device(chip);
|
|
if (ret)
|
|
goto err_init;
|
|
|
|
dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
|
|
|
|
ret = lp55xx_register_leds(led, chip);
|
|
if (ret)
|
|
goto err_register_leds;
|
|
|
|
ret = lp55xx_register_sysfs(chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "registering sysfs failed\n");
|
|
goto err_register_sysfs;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_register_sysfs:
|
|
lp55xx_unregister_leds(led, chip);
|
|
err_register_leds:
|
|
lp55xx_deinit_device(chip);
|
|
err_init:
|
|
return ret;
|
|
}
|
|
|
|
static int lp5523_remove(struct i2c_client *client)
|
|
{
|
|
struct lp55xx_led *led = i2c_get_clientdata(client);
|
|
struct lp55xx_chip *chip = led->chip;
|
|
|
|
/* Disable engine mode */
|
|
lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
|
|
|
|
lp5523_unregister_sysfs(client);
|
|
|
|
lp55xx_unregister_leds(led, chip);
|
|
lp55xx_deinit_device(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp5523_id[] = {
|
|
{ "lp5523", LP5523 },
|
|
{ "lp55231", LP55231 },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, lp5523_id);
|
|
|
|
static struct i2c_driver lp5523_driver = {
|
|
.driver = {
|
|
.name = "lp5523x",
|
|
},
|
|
.probe = lp5523_probe,
|
|
.remove = lp5523_remove,
|
|
.id_table = lp5523_id,
|
|
};
|
|
|
|
module_i2c_driver(lp5523_driver);
|
|
|
|
MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
|
|
MODULE_DESCRIPTION("LP5523 LED engine");
|
|
MODULE_LICENSE("GPL");
|