1028 lines
26 KiB
C
1028 lines
26 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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#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_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_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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struct lp5523_engine {
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int id;
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u8 mode;
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u8 prog_page;
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u8 mux_page;
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u16 led_mux;
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u8 engine_mask;
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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_engine engines[LP5523_ENGINES];
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struct lp5523_led leds[LP5523_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 struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
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{
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return container_of(cdev, struct lp5523_led, cdev);
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}
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static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
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{
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return container_of(engine, struct lp5523_chip,
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engines[engine->id - 1]);
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}
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static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
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{
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return container_of(led, struct lp5523_chip,
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leds[led->id]);
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}
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static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
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static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
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static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
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static void lp5523_led_brightness_work(struct work_struct *work);
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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 -EIO;
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*buf = ret;
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return 0;
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}
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static int lp5523_detect(struct i2c_client *client)
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{
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int ret;
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u8 buf;
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ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
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if (ret)
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return ret;
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ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
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if (ret)
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return ret;
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if (buf == 0x40)
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return 0;
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else
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return -ENODEV;
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}
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static int lp5523_configure(struct i2c_client *client)
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{
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struct lp5523_chip *chip = i2c_get_clientdata(client);
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int ret = 0;
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u8 status;
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/* one pattern per engine setting led mux start and stop addresses */
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static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
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{ 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
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{ 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
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{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
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};
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ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
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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 |= lp5523_write(client, 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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/* turn on all leds */
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ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
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ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
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/* hardcode 32 bytes of memory for each engine from program memory */
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ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
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ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
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ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
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/* write led mux address space for each channel */
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ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
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ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
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ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
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if (ret) {
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dev_err(&client->dev, "could not load mux programs\n");
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return -1;
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}
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/* set all engines exec state and mode to run 00101010 */
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ret |= lp5523_write(client, LP5523_REG_ENABLE,
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(LP5523_CMD_RUN | LP5523_ENABLE));
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ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
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if (ret) {
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dev_err(&client->dev, "could not start mux programs\n");
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return -1;
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}
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/* Let the programs run for couple of ms and check the engine status */
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usleep_range(3000, 6000);
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lp5523_read(client, LP5523_REG_STATUS, &status);
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status &= LP5523_ENG_STATUS_MASK;
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if (status == LP5523_ENG_STATUS_MASK) {
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dev_dbg(&client->dev, "all engines configured\n");
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} else {
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dev_info(&client->dev, "status == %x\n", status);
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dev_err(&client->dev, "cound not configure LED engine\n");
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return -1;
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}
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dev_info(&client->dev, "disabling engines\n");
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ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
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return ret;
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}
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static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
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{
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struct lp5523_chip *chip = engine_to_lp5523(engine);
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struct i2c_client *client = chip->client;
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int ret;
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u8 engine_state;
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ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
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if (ret)
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goto fail;
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engine_state &= ~(engine->engine_mask);
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/* set mode only for this engine */
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mode &= engine->engine_mask;
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engine_state |= mode;
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ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
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fail:
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return ret;
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}
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static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
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{
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struct lp5523_chip *chip = engine_to_lp5523(engine);
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struct i2c_client *client = chip->client;
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int ret = 0;
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ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
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ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
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ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
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(u8)(mux >> 8));
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ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
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engine->led_mux = mux;
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return ret;
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}
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static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
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{
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struct lp5523_chip *chip = engine_to_lp5523(engine);
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struct i2c_client *client = chip->client;
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int ret = 0;
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ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
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ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
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engine->prog_page);
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ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
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LP5523_PROGRAM_LENGTH, pattern);
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return ret;
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}
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static int lp5523_run_program(struct lp5523_engine *engine)
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{
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struct lp5523_chip *chip = engine_to_lp5523(engine);
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struct i2c_client *client = chip->client;
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int ret;
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ret = lp5523_write(client, LP5523_REG_ENABLE,
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LP5523_CMD_RUN | LP5523_ENABLE);
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if (ret)
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goto fail;
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ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
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fail:
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return ret;
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}
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static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
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{
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int i;
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u16 tmp_mux = 0;
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len = min_t(int, len, LP5523_LEDS);
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for (i = 0; i < len; i++) {
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switch (buf[i]) {
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case '1':
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tmp_mux |= (1 << i);
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break;
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case '0':
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break;
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case '\n':
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i = len;
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break;
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default:
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return -1;
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}
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}
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*mux = tmp_mux;
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return 0;
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}
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static void lp5523_mux_to_array(u16 led_mux, char *array)
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{
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int i, pos = 0;
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for (i = 0; i < LP5523_LEDS; i++)
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pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
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array[pos] = '\0';
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}
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/*--------------------------------------------------------------*/
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/* Sysfs interface */
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/*--------------------------------------------------------------*/
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static ssize_t show_engine_leds(struct device *dev,
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struct device_attribute *attr,
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char *buf, int nr)
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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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char mux[LP5523_LEDS + 1];
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lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
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return sprintf(buf, "%s\n", mux);
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}
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#define show_leds(nr) \
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static ssize_t show_engine##nr##_leds(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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return show_engine_leds(dev, attr, buf, nr); \
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}
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show_leds(1)
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show_leds(2)
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show_leds(3)
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static ssize_t store_engine_leds(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len, int nr)
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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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u16 mux = 0;
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ssize_t ret;
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if (lp5523_mux_parse(buf, &mux, len))
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return -EINVAL;
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mutex_lock(&chip->lock);
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ret = -EINVAL;
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if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
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goto leave;
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|
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if (lp5523_load_mux(&chip->engines[nr - 1], mux))
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goto leave;
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ret = len;
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leave:
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mutex_unlock(&chip->lock);
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return ret;
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}
|
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|
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#define store_leds(nr) \
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static ssize_t store_engine##nr##_leds(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, size_t len) \
|
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{ \
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return store_engine_leds(dev, attr, buf, len, nr); \
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}
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store_leds(1)
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store_leds(2)
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store_leds(3)
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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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|
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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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|
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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;
|
|
|
|
/* 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 (!(status & LP5523_LEDTEST_DONE))
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usleep_range(3000, 6000); /* Was not ready. Wait little bit */
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|
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ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
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vdd--; /* There may be some fluctuation in measurement */
|
|
|
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for (i = 0; i < LP5523_LEDS; i++) {
|
|
/* Skip non-existing channels */
|
|
if (chip->pdata->led_config[i].led_current == 0)
|
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continue;
|
|
|
|
/* Set default current */
|
|
lp5523_write(chip->client,
|
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LP5523_REG_LED_CURRENT_BASE + i,
|
|
chip->pdata->led_config[i].led_current);
|
|
|
|
lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
|
|
/* let current stabilize 2 - 4ms before measurements start */
|
|
usleep_range(2000, 4000);
|
|
lp5523_write(chip->client,
|
|
LP5523_REG_LED_TEST_CTRL,
|
|
LP5523_EN_LEDTEST | i);
|
|
/* ADC conversion time is 2.7 ms typically */
|
|
usleep_range(3000, 6000);
|
|
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
|
|
if (!(status & LP5523_LEDTEST_DONE))
|
|
usleep_range(3000, 6000);/* Was not ready. Wait. */
|
|
ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
|
|
|
|
if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
|
|
pos += sprintf(buf + pos, "LED %d FAIL\n", i);
|
|
|
|
lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
|
|
|
|
/* Restore current */
|
|
lp5523_write(chip->client,
|
|
LP5523_REG_LED_CURRENT_BASE + i,
|
|
chip->leds[led].led_current);
|
|
led++;
|
|
}
|
|
if (pos == 0)
|
|
pos = sprintf(buf, "OK\n");
|
|
goto release_lock;
|
|
fail:
|
|
pos = sprintf(buf, "FAIL\n");
|
|
|
|
release_lock:
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return pos;
|
|
}
|
|
|
|
static void lp5523_set_brightness(struct led_classdev *cdev,
|
|
enum led_brightness brightness)
|
|
{
|
|
struct lp5523_led *led = cdev_to_led(cdev);
|
|
|
|
led->brightness = (u8)brightness;
|
|
|
|
schedule_work(&led->brightness_work);
|
|
}
|
|
|
|
static void lp5523_led_brightness_work(struct work_struct *work)
|
|
{
|
|
struct lp5523_led *led = container_of(work,
|
|
struct lp5523_led,
|
|
brightness_work);
|
|
struct lp5523_chip *chip = led_to_lp5523(led);
|
|
struct i2c_client *client = chip->client;
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
|
|
led->brightness);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
}
|
|
|
|
static int lp5523_do_store_load(struct lp5523_engine *engine,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct lp5523_chip *chip = engine_to_lp5523(engine);
|
|
struct i2c_client *client = chip->client;
|
|
int ret, nrchars, offset = 0, i = 0;
|
|
char c[3];
|
|
unsigned cmd;
|
|
u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
|
|
|
|
if (engine->mode != LP5523_CMD_LOAD)
|
|
return -EINVAL;
|
|
|
|
while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
|
|
/* separate sscanfs because length is working only for %s */
|
|
ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
|
|
ret = sscanf(c, "%2x", &cmd);
|
|
if (ret != 1)
|
|
goto fail;
|
|
pattern[i] = (u8)cmd;
|
|
|
|
offset += nrchars;
|
|
i++;
|
|
}
|
|
|
|
/* Each instruction is 16bit long. Check that length is even */
|
|
if (i % 2)
|
|
goto fail;
|
|
|
|
mutex_lock(&chip->lock);
|
|
ret = lp5523_load_program(engine, pattern);
|
|
mutex_unlock(&chip->lock);
|
|
|
|
if (ret) {
|
|
dev_err(&client->dev, "failed loading pattern\n");
|
|
return ret;
|
|
}
|
|
|
|
return len;
|
|
fail:
|
|
dev_err(&client->dev, "wrong pattern format\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t store_engine_load(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len, int nr)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lp5523_chip *chip = i2c_get_clientdata(client);
|
|
return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
|
|
}
|
|
|
|
#define store_load(nr) \
|
|
static ssize_t store_engine##nr##_load(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
const char *buf, size_t len) \
|
|
{ \
|
|
return store_engine_load(dev, attr, buf, len, nr); \
|
|
}
|
|
store_load(1)
|
|
store_load(2)
|
|
store_load(3)
|
|
|
|
static ssize_t show_engine_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf, int nr)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lp5523_chip *chip = i2c_get_clientdata(client);
|
|
switch (chip->engines[nr - 1].mode) {
|
|
case LP5523_CMD_RUN:
|
|
return sprintf(buf, "run\n");
|
|
case LP5523_CMD_LOAD:
|
|
return sprintf(buf, "load\n");
|
|
case LP5523_CMD_DISABLED:
|
|
return sprintf(buf, "disabled\n");
|
|
default:
|
|
return sprintf(buf, "disabled\n");
|
|
}
|
|
}
|
|
|
|
#define show_mode(nr) \
|
|
static ssize_t show_engine##nr##_mode(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
return show_engine_mode(dev, attr, buf, nr); \
|
|
}
|
|
show_mode(1)
|
|
show_mode(2)
|
|
show_mode(3)
|
|
|
|
static ssize_t store_engine_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len, int nr)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lp5523_chip *chip = i2c_get_clientdata(client);
|
|
struct lp5523_engine *engine = &chip->engines[nr - 1];
|
|
mutex_lock(&chip->lock);
|
|
|
|
if (!strncmp(buf, "run", 3))
|
|
lp5523_set_mode(engine, LP5523_CMD_RUN);
|
|
else if (!strncmp(buf, "load", 4))
|
|
lp5523_set_mode(engine, LP5523_CMD_LOAD);
|
|
else if (!strncmp(buf, "disabled", 8))
|
|
lp5523_set_mode(engine, LP5523_CMD_DISABLED);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
return len;
|
|
}
|
|
|
|
#define store_mode(nr) \
|
|
static ssize_t store_engine##nr##_mode(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
const char *buf, size_t len) \
|
|
{ \
|
|
return store_engine_mode(dev, attr, buf, len, nr); \
|
|
}
|
|
store_mode(1)
|
|
store_mode(2)
|
|
store_mode(3)
|
|
|
|
static ssize_t show_max_current(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
struct lp5523_led *led = cdev_to_led(led_cdev);
|
|
|
|
return sprintf(buf, "%d\n", led->max_current);
|
|
}
|
|
|
|
static ssize_t show_current(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
struct lp5523_led *led = cdev_to_led(led_cdev);
|
|
|
|
return sprintf(buf, "%d\n", led->led_current);
|
|
}
|
|
|
|
static ssize_t store_current(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
struct lp5523_led *led = cdev_to_led(led_cdev);
|
|
struct lp5523_chip *chip = led_to_lp5523(led);
|
|
ssize_t ret;
|
|
unsigned long curr;
|
|
|
|
if (strict_strtoul(buf, 0, &curr))
|
|
return -EINVAL;
|
|
|
|
if (curr > led->max_current)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&chip->lock);
|
|
ret = lp5523_write(chip->client,
|
|
LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
|
|
(u8)curr);
|
|
mutex_unlock(&chip->lock);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
led->led_current = (u8)curr;
|
|
|
|
return len;
|
|
}
|
|
|
|
/* led class device attributes */
|
|
static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
|
|
static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
|
|
|
|
static struct attribute *lp5523_led_attributes[] = {
|
|
&dev_attr_led_current.attr,
|
|
&dev_attr_max_current.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group lp5523_led_attribute_group = {
|
|
.attrs = lp5523_led_attributes
|
|
};
|
|
|
|
/* device attributes */
|
|
static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
|
|
show_engine1_mode, store_engine1_mode);
|
|
static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
|
|
show_engine2_mode, store_engine2_mode);
|
|
static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
|
|
show_engine3_mode, store_engine3_mode);
|
|
static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
|
|
show_engine1_leds, store_engine1_leds);
|
|
static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
|
|
show_engine2_leds, store_engine2_leds);
|
|
static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
|
|
show_engine3_leds, store_engine3_leds);
|
|
static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
|
|
static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
|
|
static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
|
|
static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
|
|
|
|
static struct attribute *lp5523_attributes[] = {
|
|
&dev_attr_engine1_mode.attr,
|
|
&dev_attr_engine2_mode.attr,
|
|
&dev_attr_engine3_mode.attr,
|
|
&dev_attr_selftest.attr,
|
|
&dev_attr_engine1_load.attr,
|
|
&dev_attr_engine1_leds.attr,
|
|
&dev_attr_engine2_load.attr,
|
|
&dev_attr_engine2_leds.attr,
|
|
&dev_attr_engine3_load.attr,
|
|
&dev_attr_engine3_leds.attr,
|
|
};
|
|
|
|
static const struct attribute_group lp5523_group = {
|
|
.attrs = lp5523_attributes,
|
|
};
|
|
|
|
static int lp5523_register_sysfs(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
int ret;
|
|
|
|
ret = sysfs_create_group(&dev->kobj, &lp5523_group);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lp5523_unregister_sysfs(struct i2c_client *client)
|
|
{
|
|
struct lp5523_chip *chip = i2c_get_clientdata(client);
|
|
struct device *dev = &client->dev;
|
|
int i;
|
|
|
|
sysfs_remove_group(&dev->kobj, &lp5523_group);
|
|
|
|
for (i = 0; i < chip->num_leds; i++)
|
|
sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
|
|
&lp5523_led_attribute_group);
|
|
}
|
|
|
|
/*--------------------------------------------------------------*/
|
|
/* Set chip operating mode */
|
|
/*--------------------------------------------------------------*/
|
|
static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
|
|
{
|
|
/* if in that mode already do nothing, except for run */
|
|
if (mode == engine->mode && mode != LP5523_CMD_RUN)
|
|
return;
|
|
|
|
switch (mode) {
|
|
case LP5523_CMD_RUN:
|
|
lp5523_run_program(engine);
|
|
break;
|
|
case LP5523_CMD_LOAD:
|
|
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
|
|
lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
|
|
break;
|
|
case LP5523_CMD_DISABLED:
|
|
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
engine->mode = mode;
|
|
}
|
|
|
|
/*--------------------------------------------------------------*/
|
|
/* Probe, Attach, Remove */
|
|
/*--------------------------------------------------------------*/
|
|
static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
|
|
{
|
|
if (id < 1 || id > LP5523_ENGINES)
|
|
return -1;
|
|
engine->id = id;
|
|
engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
|
|
engine->prog_page = id - 1;
|
|
engine->mux_page = id + 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
|
|
int chan, struct lp5523_platform_data *pdata)
|
|
{
|
|
char name[32];
|
|
int res;
|
|
|
|
if (chan >= LP5523_LEDS)
|
|
return -EINVAL;
|
|
|
|
if (pdata->led_config[chan].led_current) {
|
|
led->led_current = pdata->led_config[chan].led_current;
|
|
led->max_current = pdata->led_config[chan].max_current;
|
|
led->chan_nr = pdata->led_config[chan].chan_nr;
|
|
|
|
if (led->chan_nr >= LP5523_LEDS) {
|
|
dev_err(dev, "Use channel numbers between 0 and %d\n",
|
|
LP5523_LEDS - 1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pdata->led_config[chan].name) {
|
|
led->cdev.name = pdata->led_config[chan].name;
|
|
} else {
|
|
snprintf(name, sizeof(name), "%s:channel%d",
|
|
pdata->label ?: "lp5523", chan);
|
|
led->cdev.name = name;
|
|
}
|
|
|
|
led->cdev.brightness_set = lp5523_set_brightness;
|
|
res = led_classdev_register(dev, &led->cdev);
|
|
if (res < 0) {
|
|
dev_err(dev, "couldn't register led on channel %d\n",
|
|
chan);
|
|
return res;
|
|
}
|
|
res = sysfs_create_group(&led->cdev.dev->kobj,
|
|
&lp5523_led_attribute_group);
|
|
if (res < 0) {
|
|
dev_err(dev, "couldn't register current attribute\n");
|
|
led_classdev_unregister(&led->cdev);
|
|
return res;
|
|
}
|
|
} else {
|
|
led->led_current = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit lp5523_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lp5523_chip *chip;
|
|
struct lp5523_platform_data *pdata;
|
|
int ret, i, led;
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
chip->client = client;
|
|
|
|
pdata = client->dev.platform_data;
|
|
|
|
if (!pdata) {
|
|
dev_err(&client->dev, "no platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
chip->pdata = pdata;
|
|
|
|
if (pdata->setup_resources) {
|
|
ret = pdata->setup_resources();
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (pdata->enable) {
|
|
pdata->enable(0);
|
|
usleep_range(1000, 2000); /* Keep enable down at least 1ms */
|
|
pdata->enable(1);
|
|
usleep_range(1000, 2000); /* 500us abs min. */
|
|
}
|
|
|
|
lp5523_write(client, LP5523_REG_RESET, 0xff);
|
|
usleep_range(10000, 20000); /*
|
|
* Exact value is not available. 10 - 20ms
|
|
* appears to be enough for reset.
|
|
*/
|
|
ret = lp5523_detect(client);
|
|
if (ret)
|
|
goto fail1;
|
|
|
|
dev_info(&client->dev, "LP5523 Programmable led chip found\n");
|
|
|
|
/* Initialize engines */
|
|
for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
|
|
ret = lp5523_init_engine(&chip->engines[i], i + 1);
|
|
if (ret) {
|
|
dev_err(&client->dev, "error initializing engine\n");
|
|
goto fail1;
|
|
}
|
|
}
|
|
ret = lp5523_configure(client);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "error configuring chip\n");
|
|
goto fail1;
|
|
}
|
|
|
|
/* Initialize leds */
|
|
chip->num_channels = pdata->num_channels;
|
|
chip->num_leds = 0;
|
|
led = 0;
|
|
for (i = 0; i < pdata->num_channels; i++) {
|
|
/* Do not initialize channels that are not connected */
|
|
if (pdata->led_config[i].led_current == 0)
|
|
continue;
|
|
|
|
INIT_WORK(&chip->leds[led].brightness_work,
|
|
lp5523_led_brightness_work);
|
|
|
|
ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
|
|
if (ret) {
|
|
dev_err(&client->dev, "error initializing leds\n");
|
|
goto fail2;
|
|
}
|
|
chip->num_leds++;
|
|
|
|
chip->leds[led].id = led;
|
|
/* Set LED current */
|
|
lp5523_write(client,
|
|
LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
|
|
chip->leds[led].led_current);
|
|
|
|
led++;
|
|
}
|
|
|
|
ret = lp5523_register_sysfs(client);
|
|
if (ret) {
|
|
dev_err(&client->dev, "registering sysfs failed\n");
|
|
goto fail2;
|
|
}
|
|
return ret;
|
|
fail2:
|
|
for (i = 0; i < chip->num_leds; i++) {
|
|
led_classdev_unregister(&chip->leds[i].cdev);
|
|
flush_work(&chip->leds[i].brightness_work);
|
|
}
|
|
fail1:
|
|
if (pdata->enable)
|
|
pdata->enable(0);
|
|
if (pdata->release_resources)
|
|
pdata->release_resources();
|
|
return ret;
|
|
}
|
|
|
|
static int lp5523_remove(struct i2c_client *client)
|
|
{
|
|
struct lp5523_chip *chip = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
lp5523_unregister_sysfs(client);
|
|
|
|
for (i = 0; i < chip->num_leds; i++) {
|
|
led_classdev_unregister(&chip->leds[i].cdev);
|
|
flush_work(&chip->leds[i].brightness_work);
|
|
}
|
|
|
|
if (chip->pdata->enable)
|
|
chip->pdata->enable(0);
|
|
if (chip->pdata->release_resources)
|
|
chip->pdata->release_resources();
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp5523_id[] = {
|
|
{ "lp5523", 0 },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, lp5523_id);
|
|
|
|
static struct i2c_driver lp5523_driver = {
|
|
.driver = {
|
|
.name = "lp5523",
|
|
},
|
|
.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");
|