![Samu Onkalo](/assets/img/avatar_default.png)
Chip detection may fail if the chip is in some odd state for example after system restart. Chip doesn't have HW reset line. Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
838 lines
22 KiB
C
838 lines
22 KiB
C
/*
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* LP5521 LED chip 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-lp5521.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
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#define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
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#define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
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#define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
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#define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
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#define LP5521_CMD_LOAD 0x15 /* 00010101 */
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#define LP5521_CMD_RUN 0x2a /* 00101010 */
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#define LP5521_CMD_DIRECT 0x3f /* 00111111 */
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#define LP5521_CMD_DISABLED 0x00 /* 00000000 */
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/* Registers */
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#define LP5521_REG_ENABLE 0x00
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#define LP5521_REG_OP_MODE 0x01
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#define LP5521_REG_R_PWM 0x02
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#define LP5521_REG_G_PWM 0x03
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#define LP5521_REG_B_PWM 0x04
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#define LP5521_REG_R_CURRENT 0x05
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#define LP5521_REG_G_CURRENT 0x06
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#define LP5521_REG_B_CURRENT 0x07
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#define LP5521_REG_CONFIG 0x08
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#define LP5521_REG_R_CHANNEL_PC 0x09
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#define LP5521_REG_G_CHANNEL_PC 0x0A
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#define LP5521_REG_B_CHANNEL_PC 0x0B
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#define LP5521_REG_STATUS 0x0C
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#define LP5521_REG_RESET 0x0D
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#define LP5521_REG_GPO 0x0E
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#define LP5521_REG_R_PROG_MEM 0x10
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#define LP5521_REG_G_PROG_MEM 0x30
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#define LP5521_REG_B_PROG_MEM 0x50
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#define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
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#define LP5521_PROG_MEM_SIZE 0x20
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/* Base register to set LED current */
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#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
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/* Base register to set the brightness */
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#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
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/* Bits in ENABLE register */
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#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
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#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
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#define LP5521_EXEC_RUN 0x2A
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/* Bits in CONFIG register */
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#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
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#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
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#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
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#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
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#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
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#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
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#define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */
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#define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */
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#define LP5521_CLK_INT 1 /* Internal clock */
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#define LP5521_CLK_AUTO 2 /* Automatic clock selection */
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/* Status */
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#define LP5521_EXT_CLK_USED 0x08
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struct lp5521_engine {
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const struct attribute_group *attributes;
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int id;
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u8 mode;
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u8 prog_page;
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u8 engine_mask;
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};
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struct lp5521_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 lp5521_chip {
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struct lp5521_platform_data *pdata;
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struct mutex lock; /* Serialize control */
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struct i2c_client *client;
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struct lp5521_engine engines[LP5521_MAX_ENGINES];
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struct lp5521_led leds[LP5521_MAX_LEDS];
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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 lp5521_led *cdev_to_led(struct led_classdev *cdev)
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{
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return container_of(cdev, struct lp5521_led, cdev);
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}
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static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
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{
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return container_of(engine, struct lp5521_chip,
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engines[engine->id - 1]);
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}
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static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
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{
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return container_of(led, struct lp5521_chip,
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leds[led->id]);
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}
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static void lp5521_led_brightness_work(struct work_struct *work);
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static inline int lp5521_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 lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
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{
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s32 ret;
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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 lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
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{
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struct lp5521_chip *chip = engine_to_lp5521(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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/* Only transition between RUN and DIRECT mode are handled here */
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if (mode == LP5521_CMD_LOAD)
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return 0;
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if (mode == LP5521_CMD_DISABLED)
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mode = LP5521_CMD_DIRECT;
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ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
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/* set mode only for this engine */
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engine_state &= ~(engine->engine_mask);
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mode &= engine->engine_mask;
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engine_state |= mode;
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ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
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return ret;
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}
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static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
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{
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struct lp5521_chip *chip = engine_to_lp5521(eng);
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struct i2c_client *client = chip->client;
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int ret;
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int addr;
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u8 mode;
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/* move current engine to direct mode and remember the state */
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ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
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/* Mode change requires min 500 us delay. 1 - 2 ms with margin */
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usleep_range(1000, 2000);
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ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
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/* For loading, all the engines to load mode */
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lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
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/* Mode change requires min 500 us delay. 1 - 2 ms with margin */
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usleep_range(1000, 2000);
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lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
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/* Mode change requires min 500 us delay. 1 - 2 ms with margin */
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usleep_range(1000, 2000);
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addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
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i2c_smbus_write_i2c_block_data(client,
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addr,
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LP5521_PROG_MEM_SIZE,
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pattern);
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ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
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return ret;
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}
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static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
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{
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return lp5521_write(chip->client,
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LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
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curr);
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}
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static void lp5521_init_engine(struct lp5521_chip *chip,
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const struct attribute_group *attr_group)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
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chip->engines[i].id = i + 1;
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chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
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chip->engines[i].prog_page = i;
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chip->engines[i].attributes = &attr_group[i];
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}
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}
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static int lp5521_configure(struct i2c_client *client,
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const struct attribute_group *attr_group)
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{
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struct lp5521_chip *chip = i2c_get_clientdata(client);
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int ret;
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lp5521_init_engine(chip, attr_group);
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/* Set all PWMs to direct control mode */
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ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
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/* Enable auto-powersave, set charge pump to auto, red to battery */
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ret |= lp5521_write(client, LP5521_REG_CONFIG,
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LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
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/* Initialize all channels PWM to zero -> leds off */
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ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
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ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
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ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
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/* Set engines are set to run state when OP_MODE enables engines */
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ret |= lp5521_write(client, LP5521_REG_ENABLE,
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LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
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LP5521_EXEC_RUN);
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/* enable takes 500us. 1 - 2 ms leaves some margin */
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usleep_range(1000, 2000);
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return ret;
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}
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static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
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{
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int ret;
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u8 status;
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ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
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if (ret < 0)
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return ret;
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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 == LP5521_CLOCK_EXT)
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if ((status & LP5521_EXT_CLK_USED) == 0)
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return -EIO;
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return 0;
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}
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static void lp5521_set_brightness(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lp5521_led *led = cdev_to_led(cdev);
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led->brightness = (u8)brightness;
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schedule_work(&led->brightness_work);
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}
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static void lp5521_led_brightness_work(struct work_struct *work)
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{
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struct lp5521_led *led = container_of(work,
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struct lp5521_led,
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brightness_work);
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struct lp5521_chip *chip = led_to_lp5521(led);
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struct i2c_client *client = chip->client;
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mutex_lock(&chip->lock);
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lp5521_write(client, LP5521_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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/* Detect the chip by setting its ENABLE register and reading it back. */
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static int lp5521_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 = lp5521_write(client, LP5521_REG_ENABLE,
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LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
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if (ret)
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return ret;
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/* enable takes 500us. 1 - 2 ms leaves some margin */
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usleep_range(1000, 2000);
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ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
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if (ret)
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return ret;
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if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
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return -ENODEV;
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return 0;
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}
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/* Set engine mode and create appropriate sysfs attributes, if required. */
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static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
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{
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struct lp5521_chip *chip = engine_to_lp5521(engine);
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struct i2c_client *client = chip->client;
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struct device *dev = &client->dev;
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int ret = 0;
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/* if in that mode already do nothing, except for run */
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if (mode == engine->mode && mode != LP5521_CMD_RUN)
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return 0;
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if (mode == LP5521_CMD_RUN) {
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ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
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} else if (mode == LP5521_CMD_LOAD) {
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lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
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lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
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ret = sysfs_create_group(&dev->kobj, engine->attributes);
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if (ret)
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return ret;
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} else if (mode == LP5521_CMD_DISABLED) {
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lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
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}
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/* remove load attribute from sysfs if not in load mode */
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if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD)
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sysfs_remove_group(&dev->kobj, engine->attributes);
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engine->mode = mode;
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return ret;
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}
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static int lp5521_do_store_load(struct lp5521_engine *engine,
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const char *buf, size_t len)
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{
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struct lp5521_chip *chip = engine_to_lp5521(engine);
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struct i2c_client *client = chip->client;
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int ret, nrchars, offset = 0, i = 0;
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char c[3];
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unsigned cmd;
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u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
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while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
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/* separate sscanfs because length is working only for %s */
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ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
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ret = sscanf(c, "%2x", &cmd);
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if (ret != 1)
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goto fail;
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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 fail;
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mutex_lock(&chip->lock);
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ret = lp5521_load_program(engine, pattern);
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mutex_unlock(&chip->lock);
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if (ret) {
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dev_err(&client->dev, "failed loading pattern\n");
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return ret;
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}
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return len;
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fail:
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dev_err(&client->dev, "wrong pattern format\n");
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return -EINVAL;
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}
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static ssize_t store_engine_load(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 lp5521_chip *chip = i2c_get_clientdata(client);
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return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
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}
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#define store_load(nr) \
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static ssize_t store_engine##nr##_load(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_load(dev, attr, buf, len, nr); \
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}
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store_load(1)
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store_load(2)
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store_load(3)
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static ssize_t show_engine_mode(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 lp5521_chip *chip = i2c_get_clientdata(client);
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switch (chip->engines[nr - 1].mode) {
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case LP5521_CMD_RUN:
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return sprintf(buf, "run\n");
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case LP5521_CMD_LOAD:
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return sprintf(buf, "load\n");
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case LP5521_CMD_DISABLED:
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return sprintf(buf, "disabled\n");
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default:
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return sprintf(buf, "disabled\n");
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}
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}
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#define show_mode(nr) \
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static ssize_t show_engine##nr##_mode(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_mode(dev, attr, buf, nr); \
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}
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show_mode(1)
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show_mode(2)
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show_mode(3)
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static ssize_t store_engine_mode(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 lp5521_chip *chip = i2c_get_clientdata(client);
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struct lp5521_engine *engine = &chip->engines[nr - 1];
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mutex_lock(&chip->lock);
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if (!strncmp(buf, "run", 3))
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lp5521_set_mode(engine, LP5521_CMD_RUN);
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else if (!strncmp(buf, "load", 4))
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lp5521_set_mode(engine, LP5521_CMD_LOAD);
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|
else if (!strncmp(buf, "disabled", 8))
|
|
lp5521_set_mode(engine, LP5521_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 lp5521_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 lp5521_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 lp5521_led *led = cdev_to_led(led_cdev);
|
|
struct lp5521_chip *chip = led_to_lp5521(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 = lp5521_set_led_current(chip, led->id, curr);
|
|
mutex_unlock(&chip->lock);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
led->led_current = (u8)curr;
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t lp5521_selftest(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lp5521_chip *chip = i2c_get_clientdata(client);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->lock);
|
|
ret = lp5521_run_selftest(chip, buf);
|
|
mutex_unlock(&chip->lock);
|
|
return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
|
|
}
|
|
|
|
/* led class device attributes */
|
|
static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
|
|
static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
|
|
|
|
static struct attribute *lp5521_led_attributes[] = {
|
|
&dev_attr_led_current.attr,
|
|
&dev_attr_max_current.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group lp5521_led_attribute_group = {
|
|
.attrs = lp5521_led_attributes
|
|
};
|
|
|
|
/* device attributes */
|
|
static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
|
|
show_engine1_mode, store_engine1_mode);
|
|
static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
|
|
show_engine2_mode, store_engine2_mode);
|
|
static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
|
|
show_engine3_mode, store_engine3_mode);
|
|
static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
|
|
static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
|
|
static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
|
|
static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
|
|
|
|
static struct attribute *lp5521_attributes[] = {
|
|
&dev_attr_engine1_mode.attr,
|
|
&dev_attr_engine2_mode.attr,
|
|
&dev_attr_engine3_mode.attr,
|
|
&dev_attr_selftest.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute *lp5521_engine1_attributes[] = {
|
|
&dev_attr_engine1_load.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute *lp5521_engine2_attributes[] = {
|
|
&dev_attr_engine2_load.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute *lp5521_engine3_attributes[] = {
|
|
&dev_attr_engine3_load.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lp5521_group = {
|
|
.attrs = lp5521_attributes,
|
|
};
|
|
|
|
static const struct attribute_group lp5521_engine_group[] = {
|
|
{.attrs = lp5521_engine1_attributes },
|
|
{.attrs = lp5521_engine2_attributes },
|
|
{.attrs = lp5521_engine3_attributes },
|
|
};
|
|
|
|
static int lp5521_register_sysfs(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
return sysfs_create_group(&dev->kobj, &lp5521_group);
|
|
}
|
|
|
|
static void lp5521_unregister_sysfs(struct i2c_client *client)
|
|
{
|
|
struct lp5521_chip *chip = i2c_get_clientdata(client);
|
|
struct device *dev = &client->dev;
|
|
int i;
|
|
|
|
sysfs_remove_group(&dev->kobj, &lp5521_group);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
|
|
if (chip->engines[i].mode == LP5521_CMD_LOAD)
|
|
sysfs_remove_group(&dev->kobj,
|
|
chip->engines[i].attributes);
|
|
}
|
|
|
|
for (i = 0; i < chip->num_leds; i++)
|
|
sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
|
|
&lp5521_led_attribute_group);
|
|
}
|
|
|
|
static int __init lp5521_init_led(struct lp5521_led *led,
|
|
struct i2c_client *client,
|
|
int chan, struct lp5521_platform_data *pdata)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
char name[32];
|
|
int res;
|
|
|
|
if (chan >= LP5521_MAX_LEDS)
|
|
return -EINVAL;
|
|
|
|
if (pdata->led_config[chan].led_current == 0)
|
|
return 0;
|
|
|
|
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 >= LP5521_MAX_LEDS) {
|
|
dev_err(dev, "Use channel numbers between 0 and %d\n",
|
|
LP5521_MAX_LEDS - 1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
|
|
led->cdev.brightness_set = lp5521_set_brightness;
|
|
led->cdev.name = name;
|
|
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,
|
|
&lp5521_led_attribute_group);
|
|
if (res < 0) {
|
|
dev_err(dev, "couldn't register current attribute\n");
|
|
led_classdev_unregister(&led->cdev);
|
|
return res;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lp5521_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lp5521_chip *chip;
|
|
struct lp5521_platform_data *pdata;
|
|
int ret, i, led;
|
|
|
|
chip = kzalloc(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");
|
|
ret = -EINVAL;
|
|
goto fail1;
|
|
}
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
chip->pdata = pdata;
|
|
|
|
if (pdata->setup_resources) {
|
|
ret = pdata->setup_resources();
|
|
if (ret < 0)
|
|
goto fail1;
|
|
}
|
|
|
|
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. */
|
|
}
|
|
|
|
lp5521_write(client, LP5521_REG_RESET, 0xff);
|
|
usleep_range(10000, 20000); /*
|
|
* Exact value is not available. 10 - 20ms
|
|
* appears to be enough for reset.
|
|
*/
|
|
ret = lp5521_detect(client);
|
|
|
|
if (ret) {
|
|
dev_err(&client->dev, "Chip not found\n");
|
|
goto fail2;
|
|
}
|
|
|
|
dev_info(&client->dev, "%s programmable led chip found\n", id->name);
|
|
|
|
ret = lp5521_configure(client, lp5521_engine_group);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "error configuring chip\n");
|
|
goto fail2;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
|
|
if (ret) {
|
|
dev_err(&client->dev, "error initializing leds\n");
|
|
goto fail3;
|
|
}
|
|
chip->num_leds++;
|
|
|
|
chip->leds[led].id = led;
|
|
/* Set initial LED current */
|
|
lp5521_set_led_current(chip, led,
|
|
chip->leds[led].led_current);
|
|
|
|
INIT_WORK(&(chip->leds[led].brightness_work),
|
|
lp5521_led_brightness_work);
|
|
|
|
led++;
|
|
}
|
|
|
|
ret = lp5521_register_sysfs(client);
|
|
if (ret) {
|
|
dev_err(&client->dev, "registering sysfs failed\n");
|
|
goto fail3;
|
|
}
|
|
return ret;
|
|
fail3:
|
|
for (i = 0; i < chip->num_leds; i++) {
|
|
led_classdev_unregister(&chip->leds[i].cdev);
|
|
cancel_work_sync(&chip->leds[i].brightness_work);
|
|
}
|
|
fail2:
|
|
if (pdata->enable)
|
|
pdata->enable(0);
|
|
if (pdata->release_resources)
|
|
pdata->release_resources();
|
|
fail1:
|
|
kfree(chip);
|
|
return ret;
|
|
}
|
|
|
|
static int lp5521_remove(struct i2c_client *client)
|
|
{
|
|
struct lp5521_chip *chip = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
lp5521_unregister_sysfs(client);
|
|
|
|
for (i = 0; i < chip->num_leds; i++) {
|
|
led_classdev_unregister(&chip->leds[i].cdev);
|
|
cancel_work_sync(&chip->leds[i].brightness_work);
|
|
}
|
|
|
|
if (chip->pdata->enable)
|
|
chip->pdata->enable(0);
|
|
if (chip->pdata->release_resources)
|
|
chip->pdata->release_resources();
|
|
kfree(chip);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp5521_id[] = {
|
|
{ "lp5521", 0 }, /* Three channel chip */
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lp5521_id);
|
|
|
|
static struct i2c_driver lp5521_driver = {
|
|
.driver = {
|
|
.name = "lp5521",
|
|
},
|
|
.probe = lp5521_probe,
|
|
.remove = lp5521_remove,
|
|
.id_table = lp5521_id,
|
|
};
|
|
|
|
static int __init lp5521_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_add_driver(&lp5521_driver);
|
|
|
|
if (ret < 0)
|
|
printk(KERN_ALERT "Adding lp5521 driver failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit lp5521_exit(void)
|
|
{
|
|
i2c_del_driver(&lp5521_driver);
|
|
}
|
|
|
|
module_init(lp5521_init);
|
|
module_exit(lp5521_exit);
|
|
|
|
MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
|
|
MODULE_DESCRIPTION("LP5521 LED engine");
|
|
MODULE_LICENSE("GPL v2");
|