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498 lines
13 KiB
498 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Input driver for Microchip CAP11xx based capacitive touch sensors |
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* |
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* (c) 2014 Daniel Mack <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/input.h> |
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#include <linux/leds.h> |
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#include <linux/of_irq.h> |
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#include <linux/regmap.h> |
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#include <linux/i2c.h> |
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#include <linux/gpio/consumer.h> |
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|
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#define CAP11XX_REG_MAIN_CONTROL 0x00 |
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#define CAP11XX_REG_MAIN_CONTROL_GAIN_SHIFT (6) |
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#define CAP11XX_REG_MAIN_CONTROL_GAIN_MASK (0xc0) |
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#define CAP11XX_REG_MAIN_CONTROL_DLSEEP BIT(4) |
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#define CAP11XX_REG_GENERAL_STATUS 0x02 |
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#define CAP11XX_REG_SENSOR_INPUT 0x03 |
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#define CAP11XX_REG_NOISE_FLAG_STATUS 0x0a |
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#define CAP11XX_REG_SENOR_DELTA(X) (0x10 + (X)) |
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#define CAP11XX_REG_SENSITIVITY_CONTROL 0x1f |
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#define CAP11XX_REG_CONFIG 0x20 |
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#define CAP11XX_REG_SENSOR_ENABLE 0x21 |
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#define CAP11XX_REG_SENSOR_CONFIG 0x22 |
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#define CAP11XX_REG_SENSOR_CONFIG2 0x23 |
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#define CAP11XX_REG_SAMPLING_CONFIG 0x24 |
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#define CAP11XX_REG_CALIBRATION 0x26 |
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#define CAP11XX_REG_INT_ENABLE 0x27 |
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#define CAP11XX_REG_REPEAT_RATE 0x28 |
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#define CAP11XX_REG_MT_CONFIG 0x2a |
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#define CAP11XX_REG_MT_PATTERN_CONFIG 0x2b |
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#define CAP11XX_REG_MT_PATTERN 0x2d |
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#define CAP11XX_REG_RECALIB_CONFIG 0x2f |
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#define CAP11XX_REG_SENSOR_THRESH(X) (0x30 + (X)) |
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#define CAP11XX_REG_SENSOR_NOISE_THRESH 0x38 |
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#define CAP11XX_REG_STANDBY_CHANNEL 0x40 |
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#define CAP11XX_REG_STANDBY_CONFIG 0x41 |
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#define CAP11XX_REG_STANDBY_SENSITIVITY 0x42 |
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#define CAP11XX_REG_STANDBY_THRESH 0x43 |
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#define CAP11XX_REG_CONFIG2 0x44 |
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#define CAP11XX_REG_CONFIG2_ALT_POL BIT(6) |
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#define CAP11XX_REG_SENSOR_BASE_CNT(X) (0x50 + (X)) |
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#define CAP11XX_REG_LED_POLARITY 0x73 |
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#define CAP11XX_REG_LED_OUTPUT_CONTROL 0x74 |
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#define CAP11XX_REG_LED_DUTY_CYCLE_1 0x90 |
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#define CAP11XX_REG_LED_DUTY_CYCLE_2 0x91 |
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#define CAP11XX_REG_LED_DUTY_CYCLE_3 0x92 |
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#define CAP11XX_REG_LED_DUTY_CYCLE_4 0x93 |
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#define CAP11XX_REG_LED_DUTY_MIN_MASK (0x0f) |
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#define CAP11XX_REG_LED_DUTY_MIN_MASK_SHIFT (0) |
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#define CAP11XX_REG_LED_DUTY_MAX_MASK (0xf0) |
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#define CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT (4) |
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#define CAP11XX_REG_LED_DUTY_MAX_VALUE (15) |
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#define CAP11XX_REG_SENSOR_CALIB (0xb1 + (X)) |
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#define CAP11XX_REG_SENSOR_CALIB_LSB1 0xb9 |
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#define CAP11XX_REG_SENSOR_CALIB_LSB2 0xba |
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#define CAP11XX_REG_PRODUCT_ID 0xfd |
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#define CAP11XX_REG_MANUFACTURER_ID 0xfe |
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#define CAP11XX_REG_REVISION 0xff |
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#define CAP11XX_MANUFACTURER_ID 0x5d |
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#ifdef CONFIG_LEDS_CLASS |
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struct cap11xx_led { |
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struct cap11xx_priv *priv; |
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struct led_classdev cdev; |
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u32 reg; |
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}; |
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#endif |
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struct cap11xx_priv { |
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struct regmap *regmap; |
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struct input_dev *idev; |
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struct cap11xx_led *leds; |
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int num_leds; |
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/* config */ |
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u32 keycodes[]; |
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}; |
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struct cap11xx_hw_model { |
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u8 product_id; |
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unsigned int num_channels; |
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unsigned int num_leds; |
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}; |
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enum { |
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CAP1106, |
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CAP1126, |
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CAP1188, |
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}; |
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static const struct cap11xx_hw_model cap11xx_devices[] = { |
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[CAP1106] = { .product_id = 0x55, .num_channels = 6, .num_leds = 0 }, |
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[CAP1126] = { .product_id = 0x53, .num_channels = 6, .num_leds = 2 }, |
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[CAP1188] = { .product_id = 0x50, .num_channels = 8, .num_leds = 8 }, |
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}; |
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static const struct reg_default cap11xx_reg_defaults[] = { |
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{ CAP11XX_REG_MAIN_CONTROL, 0x00 }, |
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{ CAP11XX_REG_GENERAL_STATUS, 0x00 }, |
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{ CAP11XX_REG_SENSOR_INPUT, 0x00 }, |
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{ CAP11XX_REG_NOISE_FLAG_STATUS, 0x00 }, |
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{ CAP11XX_REG_SENSITIVITY_CONTROL, 0x2f }, |
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{ CAP11XX_REG_CONFIG, 0x20 }, |
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{ CAP11XX_REG_SENSOR_ENABLE, 0x3f }, |
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{ CAP11XX_REG_SENSOR_CONFIG, 0xa4 }, |
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{ CAP11XX_REG_SENSOR_CONFIG2, 0x07 }, |
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{ CAP11XX_REG_SAMPLING_CONFIG, 0x39 }, |
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{ CAP11XX_REG_CALIBRATION, 0x00 }, |
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{ CAP11XX_REG_INT_ENABLE, 0x3f }, |
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{ CAP11XX_REG_REPEAT_RATE, 0x3f }, |
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{ CAP11XX_REG_MT_CONFIG, 0x80 }, |
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{ CAP11XX_REG_MT_PATTERN_CONFIG, 0x00 }, |
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{ CAP11XX_REG_MT_PATTERN, 0x3f }, |
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{ CAP11XX_REG_RECALIB_CONFIG, 0x8a }, |
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{ CAP11XX_REG_SENSOR_THRESH(0), 0x40 }, |
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{ CAP11XX_REG_SENSOR_THRESH(1), 0x40 }, |
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{ CAP11XX_REG_SENSOR_THRESH(2), 0x40 }, |
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{ CAP11XX_REG_SENSOR_THRESH(3), 0x40 }, |
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{ CAP11XX_REG_SENSOR_THRESH(4), 0x40 }, |
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{ CAP11XX_REG_SENSOR_THRESH(5), 0x40 }, |
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{ CAP11XX_REG_SENSOR_NOISE_THRESH, 0x01 }, |
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{ CAP11XX_REG_STANDBY_CHANNEL, 0x00 }, |
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{ CAP11XX_REG_STANDBY_CONFIG, 0x39 }, |
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{ CAP11XX_REG_STANDBY_SENSITIVITY, 0x02 }, |
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{ CAP11XX_REG_STANDBY_THRESH, 0x40 }, |
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{ CAP11XX_REG_CONFIG2, 0x40 }, |
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{ CAP11XX_REG_LED_POLARITY, 0x00 }, |
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{ CAP11XX_REG_SENSOR_CALIB_LSB1, 0x00 }, |
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{ CAP11XX_REG_SENSOR_CALIB_LSB2, 0x00 }, |
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}; |
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static bool cap11xx_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case CAP11XX_REG_MAIN_CONTROL: |
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case CAP11XX_REG_SENSOR_INPUT: |
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case CAP11XX_REG_SENOR_DELTA(0): |
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case CAP11XX_REG_SENOR_DELTA(1): |
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case CAP11XX_REG_SENOR_DELTA(2): |
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case CAP11XX_REG_SENOR_DELTA(3): |
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case CAP11XX_REG_SENOR_DELTA(4): |
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case CAP11XX_REG_SENOR_DELTA(5): |
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case CAP11XX_REG_PRODUCT_ID: |
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case CAP11XX_REG_MANUFACTURER_ID: |
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case CAP11XX_REG_REVISION: |
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return true; |
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} |
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return false; |
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} |
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static const struct regmap_config cap11xx_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = CAP11XX_REG_REVISION, |
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.reg_defaults = cap11xx_reg_defaults, |
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.num_reg_defaults = ARRAY_SIZE(cap11xx_reg_defaults), |
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.cache_type = REGCACHE_RBTREE, |
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.volatile_reg = cap11xx_volatile_reg, |
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}; |
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static irqreturn_t cap11xx_thread_func(int irq_num, void *data) |
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{ |
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struct cap11xx_priv *priv = data; |
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unsigned int status; |
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int ret, i; |
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/* |
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* Deassert interrupt. This needs to be done before reading the status |
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* registers, which will not carry valid values otherwise. |
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*/ |
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ret = regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL, 1, 0); |
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if (ret < 0) |
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goto out; |
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ret = regmap_read(priv->regmap, CAP11XX_REG_SENSOR_INPUT, &status); |
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if (ret < 0) |
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goto out; |
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for (i = 0; i < priv->idev->keycodemax; i++) |
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input_report_key(priv->idev, priv->keycodes[i], |
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status & (1 << i)); |
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input_sync(priv->idev); |
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out: |
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return IRQ_HANDLED; |
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} |
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static int cap11xx_set_sleep(struct cap11xx_priv *priv, bool sleep) |
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{ |
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/* |
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* DLSEEP mode will turn off all LEDS, prevent this |
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*/ |
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if (IS_ENABLED(CONFIG_LEDS_CLASS) && priv->num_leds) |
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return 0; |
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return regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL, |
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CAP11XX_REG_MAIN_CONTROL_DLSEEP, |
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sleep ? CAP11XX_REG_MAIN_CONTROL_DLSEEP : 0); |
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} |
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static int cap11xx_input_open(struct input_dev *idev) |
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{ |
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struct cap11xx_priv *priv = input_get_drvdata(idev); |
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return cap11xx_set_sleep(priv, false); |
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} |
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static void cap11xx_input_close(struct input_dev *idev) |
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{ |
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struct cap11xx_priv *priv = input_get_drvdata(idev); |
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cap11xx_set_sleep(priv, true); |
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} |
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#ifdef CONFIG_LEDS_CLASS |
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static int cap11xx_led_set(struct led_classdev *cdev, |
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enum led_brightness value) |
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{ |
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struct cap11xx_led *led = container_of(cdev, struct cap11xx_led, cdev); |
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struct cap11xx_priv *priv = led->priv; |
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/* |
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* All LEDs share the same duty cycle as this is a HW |
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* limitation. Brightness levels per LED are either |
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* 0 (OFF) and 1 (ON). |
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*/ |
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return regmap_update_bits(priv->regmap, |
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CAP11XX_REG_LED_OUTPUT_CONTROL, |
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BIT(led->reg), |
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value ? BIT(led->reg) : 0); |
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} |
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static int cap11xx_init_leds(struct device *dev, |
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struct cap11xx_priv *priv, int num_leds) |
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{ |
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struct device_node *node = dev->of_node, *child; |
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struct cap11xx_led *led; |
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int cnt = of_get_child_count(node); |
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int error; |
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if (!num_leds || !cnt) |
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return 0; |
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if (cnt > num_leds) |
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return -EINVAL; |
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led = devm_kcalloc(dev, cnt, sizeof(struct cap11xx_led), GFP_KERNEL); |
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if (!led) |
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return -ENOMEM; |
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priv->leds = led; |
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error = regmap_update_bits(priv->regmap, |
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CAP11XX_REG_LED_OUTPUT_CONTROL, 0xff, 0); |
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if (error) |
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return error; |
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error = regmap_update_bits(priv->regmap, CAP11XX_REG_LED_DUTY_CYCLE_4, |
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CAP11XX_REG_LED_DUTY_MAX_MASK, |
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CAP11XX_REG_LED_DUTY_MAX_VALUE << |
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CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT); |
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if (error) |
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return error; |
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for_each_child_of_node(node, child) { |
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u32 reg; |
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led->cdev.name = |
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of_get_property(child, "label", NULL) ? : child->name; |
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led->cdev.default_trigger = |
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of_get_property(child, "linux,default-trigger", NULL); |
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led->cdev.flags = 0; |
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led->cdev.brightness_set_blocking = cap11xx_led_set; |
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led->cdev.max_brightness = 1; |
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led->cdev.brightness = LED_OFF; |
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error = of_property_read_u32(child, "reg", ®); |
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if (error != 0 || reg >= num_leds) { |
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of_node_put(child); |
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return -EINVAL; |
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} |
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led->reg = reg; |
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led->priv = priv; |
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error = devm_led_classdev_register(dev, &led->cdev); |
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if (error) { |
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of_node_put(child); |
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return error; |
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} |
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priv->num_leds++; |
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led++; |
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} |
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return 0; |
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} |
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#else |
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static int cap11xx_init_leds(struct device *dev, |
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struct cap11xx_priv *priv, int num_leds) |
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{ |
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return 0; |
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} |
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#endif |
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static int cap11xx_i2c_probe(struct i2c_client *i2c_client, |
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const struct i2c_device_id *id) |
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{ |
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struct device *dev = &i2c_client->dev; |
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struct cap11xx_priv *priv; |
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struct device_node *node; |
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const struct cap11xx_hw_model *cap; |
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int i, error, irq, gain = 0; |
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unsigned int val, rev; |
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u32 gain32; |
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if (id->driver_data >= ARRAY_SIZE(cap11xx_devices)) { |
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dev_err(dev, "Invalid device ID %lu\n", id->driver_data); |
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return -EINVAL; |
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} |
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cap = &cap11xx_devices[id->driver_data]; |
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if (!cap || !cap->num_channels) { |
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dev_err(dev, "Invalid device configuration\n"); |
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return -EINVAL; |
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} |
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priv = devm_kzalloc(dev, |
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struct_size(priv, keycodes, cap->num_channels), |
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GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->regmap = devm_regmap_init_i2c(i2c_client, &cap11xx_regmap_config); |
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if (IS_ERR(priv->regmap)) |
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return PTR_ERR(priv->regmap); |
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error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val); |
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if (error) |
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return error; |
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if (val != cap->product_id) { |
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dev_err(dev, "Product ID: Got 0x%02x, expected 0x%02x\n", |
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val, cap->product_id); |
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return -ENXIO; |
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} |
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error = regmap_read(priv->regmap, CAP11XX_REG_MANUFACTURER_ID, &val); |
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if (error) |
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return error; |
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if (val != CAP11XX_MANUFACTURER_ID) { |
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dev_err(dev, "Manufacturer ID: Got 0x%02x, expected 0x%02x\n", |
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val, CAP11XX_MANUFACTURER_ID); |
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return -ENXIO; |
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} |
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error = regmap_read(priv->regmap, CAP11XX_REG_REVISION, &rev); |
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if (error < 0) |
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return error; |
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dev_info(dev, "CAP11XX detected, revision 0x%02x\n", rev); |
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node = dev->of_node; |
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if (!of_property_read_u32(node, "microchip,sensor-gain", &gain32)) { |
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if (is_power_of_2(gain32) && gain32 <= 8) |
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gain = ilog2(gain32); |
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else |
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dev_err(dev, "Invalid sensor-gain value %d\n", gain32); |
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} |
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if (of_property_read_bool(node, "microchip,irq-active-high")) { |
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error = regmap_update_bits(priv->regmap, CAP11XX_REG_CONFIG2, |
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CAP11XX_REG_CONFIG2_ALT_POL, 0); |
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if (error) |
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return error; |
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} |
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/* Provide some useful defaults */ |
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for (i = 0; i < cap->num_channels; i++) |
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priv->keycodes[i] = KEY_A + i; |
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of_property_read_u32_array(node, "linux,keycodes", |
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priv->keycodes, cap->num_channels); |
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error = regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL, |
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CAP11XX_REG_MAIN_CONTROL_GAIN_MASK, |
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gain << CAP11XX_REG_MAIN_CONTROL_GAIN_SHIFT); |
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if (error) |
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return error; |
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|
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/* Disable autorepeat. The Linux input system has its own handling. */ |
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error = regmap_write(priv->regmap, CAP11XX_REG_REPEAT_RATE, 0); |
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if (error) |
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return error; |
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priv->idev = devm_input_allocate_device(dev); |
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if (!priv->idev) |
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return -ENOMEM; |
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priv->idev->name = "CAP11XX capacitive touch sensor"; |
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priv->idev->id.bustype = BUS_I2C; |
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priv->idev->evbit[0] = BIT_MASK(EV_KEY); |
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if (of_property_read_bool(node, "autorepeat")) |
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__set_bit(EV_REP, priv->idev->evbit); |
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for (i = 0; i < cap->num_channels; i++) |
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__set_bit(priv->keycodes[i], priv->idev->keybit); |
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__clear_bit(KEY_RESERVED, priv->idev->keybit); |
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priv->idev->keycode = priv->keycodes; |
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priv->idev->keycodesize = sizeof(priv->keycodes[0]); |
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priv->idev->keycodemax = cap->num_channels; |
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priv->idev->id.vendor = CAP11XX_MANUFACTURER_ID; |
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priv->idev->id.product = cap->product_id; |
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priv->idev->id.version = rev; |
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priv->idev->open = cap11xx_input_open; |
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priv->idev->close = cap11xx_input_close; |
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error = cap11xx_init_leds(dev, priv, cap->num_leds); |
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if (error) |
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return error; |
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input_set_drvdata(priv->idev, priv); |
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|
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/* |
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* Put the device in deep sleep mode for now. |
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* ->open() will bring it back once the it is actually needed. |
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*/ |
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cap11xx_set_sleep(priv, true); |
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error = input_register_device(priv->idev); |
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if (error) |
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return error; |
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irq = irq_of_parse_and_map(node, 0); |
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if (!irq) { |
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dev_err(dev, "Unable to parse or map IRQ\n"); |
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return -ENXIO; |
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} |
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error = devm_request_threaded_irq(dev, irq, NULL, cap11xx_thread_func, |
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IRQF_ONESHOT, dev_name(dev), priv); |
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if (error) |
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return error; |
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return 0; |
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} |
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static const struct of_device_id cap11xx_dt_ids[] = { |
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{ .compatible = "microchip,cap1106", }, |
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{ .compatible = "microchip,cap1126", }, |
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{ .compatible = "microchip,cap1188", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, cap11xx_dt_ids); |
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static const struct i2c_device_id cap11xx_i2c_ids[] = { |
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{ "cap1106", CAP1106 }, |
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{ "cap1126", CAP1126 }, |
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{ "cap1188", CAP1188 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, cap11xx_i2c_ids); |
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static struct i2c_driver cap11xx_i2c_driver = { |
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.driver = { |
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.name = "cap11xx", |
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.of_match_table = cap11xx_dt_ids, |
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}, |
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.id_table = cap11xx_i2c_ids, |
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.probe = cap11xx_i2c_probe, |
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}; |
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module_i2c_driver(cap11xx_i2c_driver); |
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MODULE_DESCRIPTION("Microchip CAP11XX driver"); |
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MODULE_AUTHOR("Daniel Mack <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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