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517 lines
14 KiB
517 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013 Capella Microsystems Inc. |
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* Author: Kevin Tsai <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/interrupt.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/events.h> |
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#include <linux/init.h> |
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/* Registers Address */ |
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#define CM32181_REG_ADDR_CMD 0x00 |
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#define CM32181_REG_ADDR_WH 0x01 |
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#define CM32181_REG_ADDR_WL 0x02 |
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#define CM32181_REG_ADDR_TEST 0x03 |
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#define CM32181_REG_ADDR_ALS 0x04 |
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#define CM32181_REG_ADDR_STATUS 0x06 |
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#define CM32181_REG_ADDR_ID 0x07 |
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/* Number of Configurable Registers */ |
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#define CM32181_CONF_REG_NUM 4 |
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/* CMD register */ |
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#define CM32181_CMD_ALS_DISABLE BIT(0) |
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#define CM32181_CMD_ALS_INT_EN BIT(1) |
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#define CM32181_CMD_ALS_THRES_WINDOW BIT(2) |
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#define CM32181_CMD_ALS_PERS_SHIFT 4 |
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#define CM32181_CMD_ALS_PERS_MASK (0x03 << CM32181_CMD_ALS_PERS_SHIFT) |
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#define CM32181_CMD_ALS_PERS_DEFAULT (0x01 << CM32181_CMD_ALS_PERS_SHIFT) |
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#define CM32181_CMD_ALS_IT_SHIFT 6 |
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#define CM32181_CMD_ALS_IT_MASK (0x0F << CM32181_CMD_ALS_IT_SHIFT) |
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#define CM32181_CMD_ALS_IT_DEFAULT (0x00 << CM32181_CMD_ALS_IT_SHIFT) |
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#define CM32181_CMD_ALS_SM_SHIFT 11 |
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#define CM32181_CMD_ALS_SM_MASK (0x03 << CM32181_CMD_ALS_SM_SHIFT) |
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#define CM32181_CMD_ALS_SM_DEFAULT (0x01 << CM32181_CMD_ALS_SM_SHIFT) |
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#define CM32181_LUX_PER_BIT 500 /* ALS_SM=01 IT=800ms */ |
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#define CM32181_LUX_PER_BIT_RESOLUTION 100000 |
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#define CM32181_LUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */ |
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#define CM32181_CALIBSCALE_DEFAULT 100000 |
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#define CM32181_CALIBSCALE_RESOLUTION 100000 |
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#define SMBUS_ALERT_RESPONSE_ADDRESS 0x0c |
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/* CPM0 Index 0: device-id (3218 or 32181), 1: Unknown, 2: init_regs_bitmap */ |
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#define CPM0_REGS_BITMAP 2 |
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#define CPM0_HEADER_SIZE 3 |
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/* CPM1 Index 0: lux_per_bit, 1: calibscale, 2: resolution (100000) */ |
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#define CPM1_LUX_PER_BIT 0 |
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#define CPM1_CALIBSCALE 1 |
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#define CPM1_SIZE 3 |
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/* CM3218 Family */ |
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static const int cm3218_als_it_bits[] = { 0, 1, 2, 3 }; |
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static const int cm3218_als_it_values[] = { 100000, 200000, 400000, 800000 }; |
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/* CM32181 Family */ |
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static const int cm32181_als_it_bits[] = { 12, 8, 0, 1, 2, 3 }; |
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static const int cm32181_als_it_values[] = { |
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25000, 50000, 100000, 200000, 400000, 800000 |
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}; |
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struct cm32181_chip { |
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struct i2c_client *client; |
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struct device *dev; |
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struct mutex lock; |
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u16 conf_regs[CM32181_CONF_REG_NUM]; |
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unsigned long init_regs_bitmap; |
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int calibscale; |
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int lux_per_bit; |
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int lux_per_bit_base_it; |
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int num_als_it; |
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const int *als_it_bits; |
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const int *als_it_values; |
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}; |
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static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2); |
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#ifdef CONFIG_ACPI |
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/** |
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* cm32181_acpi_get_cpm() - Get CPM object from ACPI |
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* @dev: pointer of struct device. |
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* @obj_name: pointer of ACPI object name. |
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* @values: pointer of array for return elements. |
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* @count: maximum size of return array. |
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* |
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* Convert ACPI CPM table to array. |
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* |
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* Return: -ENODEV for fail. Otherwise is number of elements. |
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*/ |
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static int cm32181_acpi_get_cpm(struct device *dev, char *obj_name, |
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u64 *values, int count) |
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{ |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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union acpi_object *cpm, *elem; |
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acpi_handle handle; |
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acpi_status status; |
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int i; |
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handle = ACPI_HANDLE(dev); |
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if (!handle) |
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return -ENODEV; |
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status = acpi_evaluate_object(handle, obj_name, NULL, &buffer); |
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if (ACPI_FAILURE(status)) { |
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dev_err(dev, "object %s not found\n", obj_name); |
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return -ENODEV; |
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} |
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cpm = buffer.pointer; |
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if (cpm->package.count > count) |
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dev_warn(dev, "%s table contains %u values, only using first %d values\n", |
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obj_name, cpm->package.count, count); |
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count = min_t(int, cpm->package.count, count); |
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for (i = 0; i < count; i++) { |
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elem = &(cpm->package.elements[i]); |
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values[i] = elem->integer.value; |
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} |
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kfree(buffer.pointer); |
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return count; |
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} |
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static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181) |
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{ |
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u64 vals[CPM0_HEADER_SIZE + CM32181_CONF_REG_NUM]; |
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struct device *dev = cm32181->dev; |
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int i, count; |
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count = cm32181_acpi_get_cpm(dev, "CPM0", vals, ARRAY_SIZE(vals)); |
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if (count <= CPM0_HEADER_SIZE) |
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return; |
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count -= CPM0_HEADER_SIZE; |
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cm32181->init_regs_bitmap = vals[CPM0_REGS_BITMAP]; |
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cm32181->init_regs_bitmap &= GENMASK(count - 1, 0); |
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for_each_set_bit(i, &cm32181->init_regs_bitmap, count) |
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cm32181->conf_regs[i] = vals[CPM0_HEADER_SIZE + i]; |
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count = cm32181_acpi_get_cpm(dev, "CPM1", vals, ARRAY_SIZE(vals)); |
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if (count != CPM1_SIZE) |
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return; |
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cm32181->lux_per_bit = vals[CPM1_LUX_PER_BIT]; |
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/* Check for uncalibrated devices */ |
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if (vals[CPM1_CALIBSCALE] == CM32181_CALIBSCALE_DEFAULT) |
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return; |
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cm32181->calibscale = vals[CPM1_CALIBSCALE]; |
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/* CPM1 lux_per_bit is for the current it value */ |
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cm32181_read_als_it(cm32181, &cm32181->lux_per_bit_base_it); |
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} |
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#else |
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static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181) |
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{ |
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} |
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#endif /* CONFIG_ACPI */ |
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/** |
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* cm32181_reg_init() - Initialize CM32181 registers |
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* @cm32181: pointer of struct cm32181. |
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* |
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* Initialize CM32181 ambient light sensor register to default values. |
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* |
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* Return: 0 for success; otherwise for error code. |
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*/ |
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static int cm32181_reg_init(struct cm32181_chip *cm32181) |
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{ |
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struct i2c_client *client = cm32181->client; |
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int i; |
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s32 ret; |
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ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID); |
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if (ret < 0) |
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return ret; |
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/* check device ID */ |
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switch (ret & 0xFF) { |
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case 0x18: /* CM3218 */ |
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cm32181->num_als_it = ARRAY_SIZE(cm3218_als_it_bits); |
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cm32181->als_it_bits = cm3218_als_it_bits; |
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cm32181->als_it_values = cm3218_als_it_values; |
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break; |
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case 0x81: /* CM32181 */ |
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case 0x82: /* CM32182, fully compat. with CM32181 */ |
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cm32181->num_als_it = ARRAY_SIZE(cm32181_als_it_bits); |
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cm32181->als_it_bits = cm32181_als_it_bits; |
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cm32181->als_it_values = cm32181_als_it_values; |
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break; |
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default: |
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return -ENODEV; |
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} |
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/* Default Values */ |
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cm32181->conf_regs[CM32181_REG_ADDR_CMD] = |
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CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT; |
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cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD); |
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cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT; |
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cm32181->lux_per_bit = CM32181_LUX_PER_BIT; |
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cm32181->lux_per_bit_base_it = CM32181_LUX_PER_BIT_BASE_IT; |
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if (ACPI_HANDLE(cm32181->dev)) |
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cm32181_acpi_parse_cpm_tables(cm32181); |
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/* Initialize registers*/ |
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for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) { |
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ret = i2c_smbus_write_word_data(client, i, |
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cm32181->conf_regs[i]); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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/** |
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* cm32181_read_als_it() - Get sensor integration time (ms) |
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* @cm32181: pointer of struct cm32181 |
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* @val2: pointer of int to load the als_it value. |
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* |
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* Report the current integration time in milliseconds. |
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* |
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* Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL. |
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*/ |
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static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2) |
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{ |
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u16 als_it; |
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int i; |
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als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD]; |
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als_it &= CM32181_CMD_ALS_IT_MASK; |
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als_it >>= CM32181_CMD_ALS_IT_SHIFT; |
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for (i = 0; i < cm32181->num_als_it; i++) { |
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if (als_it == cm32181->als_it_bits[i]) { |
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*val2 = cm32181->als_it_values[i]; |
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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} |
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return -EINVAL; |
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} |
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/** |
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* cm32181_write_als_it() - Write sensor integration time |
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* @cm32181: pointer of struct cm32181. |
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* @val: integration time by millisecond. |
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* |
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* Convert integration time (ms) to sensor value. |
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* |
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* Return: i2c_smbus_write_word_data command return value. |
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*/ |
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static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val) |
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{ |
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struct i2c_client *client = cm32181->client; |
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u16 als_it; |
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int ret, i, n; |
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n = cm32181->num_als_it; |
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for (i = 0; i < n; i++) |
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if (val <= cm32181->als_it_values[i]) |
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break; |
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if (i >= n) |
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i = n - 1; |
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als_it = cm32181->als_it_bits[i]; |
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als_it <<= CM32181_CMD_ALS_IT_SHIFT; |
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mutex_lock(&cm32181->lock); |
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cm32181->conf_regs[CM32181_REG_ADDR_CMD] &= |
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~CM32181_CMD_ALS_IT_MASK; |
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cm32181->conf_regs[CM32181_REG_ADDR_CMD] |= |
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als_it; |
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ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD, |
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cm32181->conf_regs[CM32181_REG_ADDR_CMD]); |
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mutex_unlock(&cm32181->lock); |
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return ret; |
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} |
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/** |
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* cm32181_get_lux() - report current lux value |
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* @cm32181: pointer of struct cm32181. |
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* |
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* Convert sensor raw data to lux. It depends on integration |
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* time and calibscale variable. |
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* |
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* Return: Positive value is lux, otherwise is error code. |
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*/ |
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static int cm32181_get_lux(struct cm32181_chip *cm32181) |
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{ |
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struct i2c_client *client = cm32181->client; |
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int ret; |
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int als_it; |
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u64 lux; |
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ret = cm32181_read_als_it(cm32181, &als_it); |
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if (ret < 0) |
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return -EINVAL; |
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lux = cm32181->lux_per_bit; |
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lux *= cm32181->lux_per_bit_base_it; |
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lux = div_u64(lux, als_it); |
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ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS); |
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if (ret < 0) |
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return ret; |
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lux *= ret; |
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lux *= cm32181->calibscale; |
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lux = div_u64(lux, CM32181_CALIBSCALE_RESOLUTION); |
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lux = div_u64(lux, CM32181_LUX_PER_BIT_RESOLUTION); |
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if (lux > 0xFFFF) |
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lux = 0xFFFF; |
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return lux; |
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} |
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static int cm32181_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct cm32181_chip *cm32181 = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_PROCESSED: |
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ret = cm32181_get_lux(cm32181); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_CALIBSCALE: |
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*val = cm32181->calibscale; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_INT_TIME: |
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*val = 0; |
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ret = cm32181_read_als_it(cm32181, val2); |
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return ret; |
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} |
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return -EINVAL; |
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} |
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static int cm32181_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct cm32181_chip *cm32181 = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_CALIBSCALE: |
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cm32181->calibscale = val; |
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return val; |
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case IIO_CHAN_INFO_INT_TIME: |
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ret = cm32181_write_als_it(cm32181, val2); |
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return ret; |
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} |
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return -EINVAL; |
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} |
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/** |
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* cm32181_get_it_available() - Get available ALS IT value |
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* @dev: pointer of struct device. |
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* @attr: pointer of struct device_attribute. |
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* @buf: pointer of return string buffer. |
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* |
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* Display the available integration time values by millisecond. |
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* |
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* Return: string length. |
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*/ |
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static ssize_t cm32181_get_it_available(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct cm32181_chip *cm32181 = iio_priv(dev_to_iio_dev(dev)); |
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int i, n, len; |
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n = cm32181->num_als_it; |
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for (i = 0, len = 0; i < n; i++) |
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len += sprintf(buf + len, "0.%06u ", cm32181->als_it_values[i]); |
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return len + sprintf(buf + len, "\n"); |
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} |
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static const struct iio_chan_spec cm32181_channels[] = { |
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{ |
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.type = IIO_LIGHT, |
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.info_mask_separate = |
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BIT(IIO_CHAN_INFO_PROCESSED) | |
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BIT(IIO_CHAN_INFO_CALIBSCALE) | |
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BIT(IIO_CHAN_INFO_INT_TIME), |
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} |
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}; |
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static IIO_DEVICE_ATTR(in_illuminance_integration_time_available, |
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S_IRUGO, cm32181_get_it_available, NULL, 0); |
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static struct attribute *cm32181_attributes[] = { |
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&iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr, |
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NULL, |
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}; |
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static const struct attribute_group cm32181_attribute_group = { |
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.attrs = cm32181_attributes |
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}; |
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static const struct iio_info cm32181_info = { |
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.read_raw = &cm32181_read_raw, |
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.write_raw = &cm32181_write_raw, |
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.attrs = &cm32181_attribute_group, |
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}; |
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static int cm32181_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct cm32181_chip *cm32181; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*cm32181)); |
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if (!indio_dev) |
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return -ENOMEM; |
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/* |
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* Some ACPI systems list 2 I2C resources for the CM3218 sensor, the |
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* SMBus Alert Response Address (ARA, 0x0c) and the actual I2C address. |
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* Detect this and take the following step to deal with it: |
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* 1. When a SMBus Alert capable sensor has an Alert asserted, it will |
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* not respond on its actual I2C address. Read a byte from the ARA |
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* to clear any pending Alerts. |
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* 2. Create a "dummy" client for the actual I2C address and |
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* use that client to communicate with the sensor. |
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*/ |
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if (ACPI_HANDLE(dev) && client->addr == SMBUS_ALERT_RESPONSE_ADDRESS) { |
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struct i2c_board_info board_info = { .type = "dummy" }; |
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i2c_smbus_read_byte(client); |
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client = i2c_acpi_new_device(dev, 1, &board_info); |
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if (IS_ERR(client)) |
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return PTR_ERR(client); |
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} |
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cm32181 = iio_priv(indio_dev); |
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cm32181->client = client; |
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cm32181->dev = dev; |
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mutex_init(&cm32181->lock); |
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indio_dev->channels = cm32181_channels; |
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indio_dev->num_channels = ARRAY_SIZE(cm32181_channels); |
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indio_dev->info = &cm32181_info; |
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indio_dev->name = dev_name(dev); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = cm32181_reg_init(cm32181); |
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if (ret) { |
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dev_err(dev, "%s: register init failed\n", __func__); |
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return ret; |
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} |
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ret = devm_iio_device_register(dev, indio_dev); |
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if (ret) { |
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dev_err(dev, "%s: regist device failed\n", __func__); |
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return ret; |
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} |
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return 0; |
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} |
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static const struct of_device_id cm32181_of_match[] = { |
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{ .compatible = "capella,cm3218" }, |
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{ .compatible = "capella,cm32181" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, cm32181_of_match); |
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#ifdef CONFIG_ACPI |
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static const struct acpi_device_id cm32181_acpi_match[] = { |
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{ "CPLM3218", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(acpi, cm32181_acpi_match); |
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#endif |
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static struct i2c_driver cm32181_driver = { |
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.driver = { |
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.name = "cm32181", |
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.acpi_match_table = ACPI_PTR(cm32181_acpi_match), |
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.of_match_table = cm32181_of_match, |
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}, |
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.probe_new = cm32181_probe, |
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}; |
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module_i2c_driver(cm32181_driver); |
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MODULE_AUTHOR("Kevin Tsai <[email protected]>"); |
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MODULE_DESCRIPTION("CM32181 ambient light sensor driver"); |
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MODULE_LICENSE("GPL");
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