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608 lines
17 KiB
608 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2015-16 Golden Delicious Computers |
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* |
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* Author: Nikolaus Schaller <[email protected]> |
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* |
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* LED driver for the IS31FL319{0,1,3,6,9} to drive 1, 3, 6 or 9 light |
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* effect LEDs. |
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*/ |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/leds.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/module.h> |
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#include <linux/property.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/gpio/consumer.h> |
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/* register numbers */ |
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#define IS31FL319X_SHUTDOWN 0x00 |
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/* registers for 3190, 3191 and 3193 */ |
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#define IS31FL3190_BREATHING 0x01 |
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#define IS31FL3190_LEDMODE 0x02 |
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#define IS31FL3190_CURRENT 0x03 |
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#define IS31FL3190_PWM(channel) (0x04 + channel) |
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#define IS31FL3190_DATA_UPDATE 0x07 |
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#define IS31FL3190_T0(channel) (0x0a + channel) |
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#define IS31FL3190_T1T2(channel) (0x10 + channel) |
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#define IS31FL3190_T3T4(channel) (0x16 + channel) |
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#define IS31FL3190_TIME_UPDATE 0x1c |
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#define IS31FL3190_LEDCONTROL 0x1d |
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#define IS31FL3190_RESET 0x2f |
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#define IS31FL3190_CURRENT_uA_MIN 5000 |
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#define IS31FL3190_CURRENT_uA_DEFAULT 42000 |
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#define IS31FL3190_CURRENT_uA_MAX 42000 |
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#define IS31FL3190_CURRENT_MASK GENMASK(4, 2) |
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#define IS31FL3190_CURRENT_5_mA 0x02 |
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#define IS31FL3190_CURRENT_10_mA 0x01 |
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#define IS31FL3190_CURRENT_17dot5_mA 0x04 |
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#define IS31FL3190_CURRENT_30_mA 0x03 |
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#define IS31FL3190_CURRENT_42_mA 0x00 |
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/* registers for 3196 and 3199 */ |
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#define IS31FL3196_CTRL1 0x01 |
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#define IS31FL3196_CTRL2 0x02 |
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#define IS31FL3196_CONFIG1 0x03 |
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#define IS31FL3196_CONFIG2 0x04 |
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#define IS31FL3196_RAMP_MODE 0x05 |
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#define IS31FL3196_BREATH_MARK 0x06 |
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#define IS31FL3196_PWM(channel) (0x07 + channel) |
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#define IS31FL3196_DATA_UPDATE 0x10 |
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#define IS31FL3196_T0(channel) (0x11 + channel) |
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#define IS31FL3196_T123_1 0x1a |
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#define IS31FL3196_T123_2 0x1b |
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#define IS31FL3196_T123_3 0x1c |
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#define IS31FL3196_T4(channel) (0x1d + channel) |
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#define IS31FL3196_TIME_UPDATE 0x26 |
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#define IS31FL3196_RESET 0xff |
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#define IS31FL3196_REG_CNT (IS31FL3196_RESET + 1) |
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#define IS31FL319X_MAX_LEDS 9 |
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/* CS (Current Setting) in CONFIG2 register */ |
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#define IS31FL3196_CONFIG2_CS_SHIFT 4 |
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#define IS31FL3196_CONFIG2_CS_MASK GENMASK(2, 0) |
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#define IS31FL3196_CONFIG2_CS_STEP_REF 12 |
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#define IS31FL3196_CURRENT_uA_MIN 5000 |
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#define IS31FL3196_CURRENT_uA_MAX 40000 |
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#define IS31FL3196_CURRENT_uA_STEP 5000 |
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#define IS31FL3196_CURRENT_uA_DEFAULT 20000 |
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/* Audio gain in CONFIG2 register */ |
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#define IS31FL3196_AUDIO_GAIN_DB_MAX ((u32)21) |
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#define IS31FL3196_AUDIO_GAIN_DB_STEP 3 |
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|
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/* |
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* regmap is used as a cache of chip's register space, |
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* to avoid reading back brightness values from chip, |
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* which is known to hang. |
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*/ |
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struct is31fl319x_chip { |
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const struct is31fl319x_chipdef *cdef; |
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struct i2c_client *client; |
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struct gpio_desc *shutdown_gpio; |
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struct regmap *regmap; |
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struct mutex lock; |
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u32 audio_gain_db; |
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struct is31fl319x_led { |
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struct is31fl319x_chip *chip; |
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struct led_classdev cdev; |
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u32 max_microamp; |
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bool configured; |
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} leds[IS31FL319X_MAX_LEDS]; |
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}; |
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struct is31fl319x_chipdef { |
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int num_leds; |
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u8 reset_reg; |
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const struct regmap_config *is31fl319x_regmap_config; |
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int (*brightness_set)(struct led_classdev *cdev, enum led_brightness brightness); |
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u32 current_default; |
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u32 current_min; |
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u32 current_max; |
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bool is_3196or3199; |
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}; |
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static bool is31fl319x_readable_reg(struct device *dev, unsigned int reg) |
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{ |
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/* we have no readable registers */ |
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return false; |
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} |
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static bool is31fl3190_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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/* volatile registers are not cached */ |
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switch (reg) { |
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case IS31FL3190_DATA_UPDATE: |
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case IS31FL3190_TIME_UPDATE: |
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case IS31FL3190_RESET: |
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return true; /* always write-through */ |
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default: |
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return false; |
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} |
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} |
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static const struct reg_default is31fl3190_reg_defaults[] = { |
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{ IS31FL3190_LEDMODE, 0x00 }, |
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{ IS31FL3190_CURRENT, 0x00 }, |
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{ IS31FL3190_PWM(0), 0x00 }, |
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{ IS31FL3190_PWM(1), 0x00 }, |
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{ IS31FL3190_PWM(2), 0x00 }, |
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}; |
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static struct regmap_config is31fl3190_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = IS31FL3190_RESET, |
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.cache_type = REGCACHE_FLAT, |
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.readable_reg = is31fl319x_readable_reg, |
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.volatile_reg = is31fl3190_volatile_reg, |
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.reg_defaults = is31fl3190_reg_defaults, |
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.num_reg_defaults = ARRAY_SIZE(is31fl3190_reg_defaults), |
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}; |
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static bool is31fl3196_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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/* volatile registers are not cached */ |
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switch (reg) { |
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case IS31FL3196_DATA_UPDATE: |
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case IS31FL3196_TIME_UPDATE: |
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case IS31FL3196_RESET: |
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return true; /* always write-through */ |
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default: |
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return false; |
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} |
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} |
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static const struct reg_default is31fl3196_reg_defaults[] = { |
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{ IS31FL3196_CONFIG1, 0x00 }, |
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{ IS31FL3196_CONFIG2, 0x00 }, |
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{ IS31FL3196_PWM(0), 0x00 }, |
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{ IS31FL3196_PWM(1), 0x00 }, |
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{ IS31FL3196_PWM(2), 0x00 }, |
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{ IS31FL3196_PWM(3), 0x00 }, |
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{ IS31FL3196_PWM(4), 0x00 }, |
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{ IS31FL3196_PWM(5), 0x00 }, |
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{ IS31FL3196_PWM(6), 0x00 }, |
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{ IS31FL3196_PWM(7), 0x00 }, |
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{ IS31FL3196_PWM(8), 0x00 }, |
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}; |
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static struct regmap_config is31fl3196_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = IS31FL3196_REG_CNT, |
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.cache_type = REGCACHE_FLAT, |
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.readable_reg = is31fl319x_readable_reg, |
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.volatile_reg = is31fl3196_volatile_reg, |
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.reg_defaults = is31fl3196_reg_defaults, |
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.num_reg_defaults = ARRAY_SIZE(is31fl3196_reg_defaults), |
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}; |
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static int is31fl3190_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev); |
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struct is31fl319x_chip *is31 = led->chip; |
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int chan = led - is31->leds; |
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int ret; |
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int i; |
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u8 ctrl = 0; |
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dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness); |
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mutex_lock(&is31->lock); |
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/* update PWM register */ |
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ret = regmap_write(is31->regmap, IS31FL3190_PWM(chan), brightness); |
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if (ret < 0) |
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goto out; |
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/* read current brightness of all PWM channels */ |
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for (i = 0; i < is31->cdef->num_leds; i++) { |
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unsigned int pwm_value; |
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bool on; |
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/* |
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* since neither cdev nor the chip can provide |
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* the current setting, we read from the regmap cache |
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*/ |
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ret = regmap_read(is31->regmap, IS31FL3190_PWM(i), &pwm_value); |
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on = ret >= 0 && pwm_value > LED_OFF; |
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ctrl |= on << i; |
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} |
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if (ctrl > 0) { |
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dev_dbg(&is31->client->dev, "power up %02x\n", ctrl); |
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regmap_write(is31->regmap, IS31FL3190_LEDCONTROL, ctrl); |
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/* update PWMs */ |
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regmap_write(is31->regmap, IS31FL3190_DATA_UPDATE, 0x00); |
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/* enable chip from shut down and enable all channels */ |
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x20); |
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} else { |
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dev_dbg(&is31->client->dev, "power down\n"); |
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/* shut down (no need to clear LEDCONTROL) */ |
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01); |
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} |
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out: |
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mutex_unlock(&is31->lock); |
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return ret; |
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} |
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static int is31fl3196_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev); |
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struct is31fl319x_chip *is31 = led->chip; |
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int chan = led - is31->leds; |
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int ret; |
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int i; |
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u8 ctrl1 = 0, ctrl2 = 0; |
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dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness); |
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mutex_lock(&is31->lock); |
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/* update PWM register */ |
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ret = regmap_write(is31->regmap, IS31FL3196_PWM(chan), brightness); |
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if (ret < 0) |
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goto out; |
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/* read current brightness of all PWM channels */ |
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for (i = 0; i < is31->cdef->num_leds; i++) { |
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unsigned int pwm_value; |
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bool on; |
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/* |
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* since neither cdev nor the chip can provide |
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* the current setting, we read from the regmap cache |
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*/ |
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ret = regmap_read(is31->regmap, IS31FL3196_PWM(i), &pwm_value); |
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on = ret >= 0 && pwm_value > LED_OFF; |
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if (i < 3) |
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ctrl1 |= on << i; /* 0..2 => bit 0..2 */ |
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else if (i < 6) |
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ctrl1 |= on << (i + 1); /* 3..5 => bit 4..6 */ |
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else |
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ctrl2 |= on << (i - 6); /* 6..8 => bit 0..2 */ |
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} |
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if (ctrl1 > 0 || ctrl2 > 0) { |
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dev_dbg(&is31->client->dev, "power up %02x %02x\n", |
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ctrl1, ctrl2); |
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regmap_write(is31->regmap, IS31FL3196_CTRL1, ctrl1); |
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regmap_write(is31->regmap, IS31FL3196_CTRL2, ctrl2); |
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/* update PWMs */ |
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regmap_write(is31->regmap, IS31FL3196_DATA_UPDATE, 0x00); |
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/* enable chip from shut down */ |
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01); |
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} else { |
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dev_dbg(&is31->client->dev, "power down\n"); |
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/* shut down (no need to clear CTRL1/2) */ |
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00); |
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} |
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out: |
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mutex_unlock(&is31->lock); |
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return ret; |
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} |
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static const struct is31fl319x_chipdef is31fl3190_cdef = { |
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.num_leds = 1, |
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.reset_reg = IS31FL3190_RESET, |
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.is31fl319x_regmap_config = &is31fl3190_regmap_config, |
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.brightness_set = is31fl3190_brightness_set, |
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.current_default = IS31FL3190_CURRENT_uA_DEFAULT, |
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.current_min = IS31FL3190_CURRENT_uA_MIN, |
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.current_max = IS31FL3190_CURRENT_uA_MAX, |
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.is_3196or3199 = false, |
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}; |
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static const struct is31fl319x_chipdef is31fl3193_cdef = { |
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.num_leds = 3, |
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.reset_reg = IS31FL3190_RESET, |
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.is31fl319x_regmap_config = &is31fl3190_regmap_config, |
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.brightness_set = is31fl3190_brightness_set, |
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.current_default = IS31FL3190_CURRENT_uA_DEFAULT, |
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.current_min = IS31FL3190_CURRENT_uA_MIN, |
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.current_max = IS31FL3190_CURRENT_uA_MAX, |
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.is_3196or3199 = false, |
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}; |
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static const struct is31fl319x_chipdef is31fl3196_cdef = { |
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.num_leds = 6, |
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.reset_reg = IS31FL3196_RESET, |
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.is31fl319x_regmap_config = &is31fl3196_regmap_config, |
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.brightness_set = is31fl3196_brightness_set, |
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.current_default = IS31FL3196_CURRENT_uA_DEFAULT, |
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.current_min = IS31FL3196_CURRENT_uA_MIN, |
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.current_max = IS31FL3196_CURRENT_uA_MAX, |
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.is_3196or3199 = true, |
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}; |
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static const struct is31fl319x_chipdef is31fl3199_cdef = { |
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.num_leds = 9, |
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.reset_reg = IS31FL3196_RESET, |
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.is31fl319x_regmap_config = &is31fl3196_regmap_config, |
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.brightness_set = is31fl3196_brightness_set, |
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.current_default = IS31FL3196_CURRENT_uA_DEFAULT, |
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.current_min = IS31FL3196_CURRENT_uA_MIN, |
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.current_max = IS31FL3196_CURRENT_uA_MAX, |
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.is_3196or3199 = true, |
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}; |
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static const struct of_device_id of_is31fl319x_match[] = { |
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{ .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, }, |
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{ .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, }, |
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{ .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, }, |
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{ .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, }, |
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{ .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, }, |
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{ .compatible = "si-en,sn3190", .data = &is31fl3190_cdef, }, |
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{ .compatible = "si-en,sn3191", .data = &is31fl3190_cdef, }, |
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{ .compatible = "si-en,sn3193", .data = &is31fl3193_cdef, }, |
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{ .compatible = "si-en,sn3196", .data = &is31fl3196_cdef, }, |
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{ .compatible = "si-en,sn3199", .data = &is31fl3199_cdef, }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, of_is31fl319x_match); |
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static int is31fl319x_parse_child_fw(const struct device *dev, |
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const struct fwnode_handle *child, |
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struct is31fl319x_led *led, |
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struct is31fl319x_chip *is31) |
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{ |
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struct led_classdev *cdev = &led->cdev; |
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int ret; |
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if (fwnode_property_read_string(child, "label", &cdev->name)) |
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cdev->name = fwnode_get_name(child); |
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ret = fwnode_property_read_string(child, "linux,default-trigger", &cdev->default_trigger); |
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if (ret < 0 && ret != -EINVAL) /* is optional */ |
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return ret; |
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led->max_microamp = is31->cdef->current_default; |
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ret = fwnode_property_read_u32(child, "led-max-microamp", &led->max_microamp); |
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if (!ret) { |
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if (led->max_microamp < is31->cdef->current_min) |
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return -EINVAL; /* not supported */ |
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led->max_microamp = min(led->max_microamp, |
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is31->cdef->current_max); |
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} |
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return 0; |
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} |
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static int is31fl319x_parse_fw(struct device *dev, struct is31fl319x_chip *is31) |
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{ |
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struct fwnode_handle *fwnode = dev_fwnode(dev), *child; |
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int count; |
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int ret; |
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is31->shutdown_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH); |
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if (IS_ERR(is31->shutdown_gpio)) |
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return dev_err_probe(dev, PTR_ERR(is31->shutdown_gpio), |
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"Failed to get shutdown gpio\n"); |
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is31->cdef = device_get_match_data(dev); |
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count = 0; |
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fwnode_for_each_available_child_node(fwnode, child) |
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count++; |
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dev_dbg(dev, "probing with %d leds defined in DT\n", count); |
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if (!count || count > is31->cdef->num_leds) |
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return dev_err_probe(dev, -ENODEV, |
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"Number of leds defined must be between 1 and %u\n", |
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is31->cdef->num_leds); |
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fwnode_for_each_available_child_node(fwnode, child) { |
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struct is31fl319x_led *led; |
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u32 reg; |
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ret = fwnode_property_read_u32(child, "reg", ®); |
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if (ret) { |
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ret = dev_err_probe(dev, ret, "Failed to read led 'reg' property\n"); |
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goto put_child_node; |
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} |
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if (reg < 1 || reg > is31->cdef->num_leds) { |
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ret = dev_err_probe(dev, -EINVAL, "invalid led reg %u\n", reg); |
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goto put_child_node; |
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} |
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led = &is31->leds[reg - 1]; |
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if (led->configured) { |
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ret = dev_err_probe(dev, -EINVAL, "led %u is already configured\n", reg); |
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goto put_child_node; |
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} |
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ret = is31fl319x_parse_child_fw(dev, child, led, is31); |
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if (ret) { |
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ret = dev_err_probe(dev, ret, "led %u DT parsing failed\n", reg); |
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goto put_child_node; |
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} |
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led->configured = true; |
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} |
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is31->audio_gain_db = 0; |
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if (is31->cdef->is_3196or3199) { |
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ret = fwnode_property_read_u32(fwnode, "audio-gain-db", &is31->audio_gain_db); |
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if (!ret) |
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is31->audio_gain_db = min(is31->audio_gain_db, |
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IS31FL3196_AUDIO_GAIN_DB_MAX); |
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} |
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return 0; |
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put_child_node: |
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fwnode_handle_put(child); |
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return ret; |
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} |
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static inline int is31fl3190_microamp_to_cs(struct device *dev, u32 microamp) |
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{ |
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switch (microamp) { |
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case 5000: |
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return IS31FL3190_CURRENT_5_mA; |
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case 10000: |
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return IS31FL3190_CURRENT_10_mA; |
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case 17500: |
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return IS31FL3190_CURRENT_17dot5_mA; |
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case 30000: |
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return IS31FL3190_CURRENT_30_mA; |
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case 42000: |
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return IS31FL3190_CURRENT_42_mA; |
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default: |
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dev_warn(dev, "Unsupported current value: %d, using 5000 µA!\n", microamp); |
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return IS31FL3190_CURRENT_5_mA; |
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} |
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} |
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static inline int is31fl3196_microamp_to_cs(struct device *dev, u32 microamp) |
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{ |
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/* round down to nearest supported value (range check done by caller) */ |
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u32 step = microamp / IS31FL3196_CURRENT_uA_STEP; |
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return ((IS31FL3196_CONFIG2_CS_STEP_REF - step) & |
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IS31FL3196_CONFIG2_CS_MASK) << |
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IS31FL3196_CONFIG2_CS_SHIFT; /* CS encoding */ |
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} |
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static inline int is31fl3196_db_to_gain(u32 dezibel) |
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{ |
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/* round down to nearest supported value (range check done by caller) */ |
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return dezibel / IS31FL3196_AUDIO_GAIN_DB_STEP; |
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} |
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|
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static int is31fl319x_probe(struct i2c_client *client) |
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{ |
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struct is31fl319x_chip *is31; |
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struct device *dev = &client->dev; |
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int err; |
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int i = 0; |
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u32 aggregated_led_microamp; |
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|
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
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return -EIO; |
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|
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is31 = devm_kzalloc(&client->dev, sizeof(*is31), GFP_KERNEL); |
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if (!is31) |
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return -ENOMEM; |
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|
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mutex_init(&is31->lock); |
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err = devm_add_action(dev, (void (*)(void *))mutex_destroy, &is31->lock); |
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if (err) |
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return err; |
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|
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err = is31fl319x_parse_fw(&client->dev, is31); |
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if (err) |
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return err; |
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|
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if (is31->shutdown_gpio) { |
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gpiod_direction_output(is31->shutdown_gpio, 0); |
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mdelay(5); |
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gpiod_direction_output(is31->shutdown_gpio, 1); |
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} |
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|
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is31->client = client; |
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is31->regmap = devm_regmap_init_i2c(client, is31->cdef->is31fl319x_regmap_config); |
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if (IS_ERR(is31->regmap)) |
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return dev_err_probe(dev, PTR_ERR(is31->regmap), "failed to allocate register map\n"); |
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|
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i2c_set_clientdata(client, is31); |
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|
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/* check for write-reply from chip (we can't read any registers) */ |
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err = regmap_write(is31->regmap, is31->cdef->reset_reg, 0x00); |
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if (err < 0) |
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return dev_err_probe(dev, err, "no response from chip write\n"); |
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|
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/* |
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* Kernel conventions require per-LED led-max-microamp property. |
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* But the chip does not allow to limit individual LEDs. |
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* So we take minimum from all subnodes for safety of hardware. |
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*/ |
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aggregated_led_microamp = is31->cdef->current_max; |
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for (i = 0; i < is31->cdef->num_leds; i++) |
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if (is31->leds[i].configured && |
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is31->leds[i].max_microamp < aggregated_led_microamp) |
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aggregated_led_microamp = is31->leds[i].max_microamp; |
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|
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if (is31->cdef->is_3196or3199) |
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regmap_write(is31->regmap, IS31FL3196_CONFIG2, |
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is31fl3196_microamp_to_cs(dev, aggregated_led_microamp) | |
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is31fl3196_db_to_gain(is31->audio_gain_db)); |
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else |
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regmap_update_bits(is31->regmap, IS31FL3190_CURRENT, IS31FL3190_CURRENT_MASK, |
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is31fl3190_microamp_to_cs(dev, aggregated_led_microamp)); |
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|
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for (i = 0; i < is31->cdef->num_leds; i++) { |
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struct is31fl319x_led *led = &is31->leds[i]; |
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|
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if (!led->configured) |
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continue; |
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|
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led->chip = is31; |
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led->cdev.brightness_set_blocking = is31->cdef->brightness_set; |
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|
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err = devm_led_classdev_register(&client->dev, &led->cdev); |
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if (err < 0) |
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return err; |
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} |
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|
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return 0; |
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} |
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|
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/* |
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* i2c-core (and modalias) requires that id_table be properly filled, |
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* even though it is not used for DeviceTree based instantiation. |
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*/ |
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static const struct i2c_device_id is31fl319x_id[] = { |
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{ "is31fl3190" }, |
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{ "is31fl3191" }, |
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{ "is31fl3193" }, |
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{ "is31fl3196" }, |
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{ "is31fl3199" }, |
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{ "sn3190" }, |
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{ "sn3191" }, |
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{ "sn3193" }, |
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{ "sn3196" }, |
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{ "sn3199" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(i2c, is31fl319x_id); |
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|
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static struct i2c_driver is31fl319x_driver = { |
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.driver = { |
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.name = "leds-is31fl319x", |
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.of_match_table = of_is31fl319x_match, |
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}, |
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.probe_new = is31fl319x_probe, |
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.id_table = is31fl319x_id, |
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}; |
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|
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module_i2c_driver(is31fl319x_driver); |
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|
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MODULE_AUTHOR("H. Nikolaus Schaller <[email protected]>"); |
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MODULE_AUTHOR("Andrey Utkin <[email protected]>"); |
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MODULE_DESCRIPTION("IS31FL319X LED driver"); |
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MODULE_LICENSE("GPL v2");
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