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457 lines
11 KiB
457 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* JSA1212 Ambient Light & Proximity Sensor Driver |
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* |
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* Copyright (c) 2014, Intel Corporation. |
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* |
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* JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD) |
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* |
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* TODO: Interrupt support, thresholds, range support. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <linux/acpi.h> |
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#include <linux/regmap.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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/* JSA1212 reg address */ |
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#define JSA1212_CONF_REG 0x01 |
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#define JSA1212_INT_REG 0x02 |
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#define JSA1212_PXS_LT_REG 0x03 |
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#define JSA1212_PXS_HT_REG 0x04 |
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#define JSA1212_ALS_TH1_REG 0x05 |
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#define JSA1212_ALS_TH2_REG 0x06 |
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#define JSA1212_ALS_TH3_REG 0x07 |
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#define JSA1212_PXS_DATA_REG 0x08 |
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#define JSA1212_ALS_DT1_REG 0x09 |
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#define JSA1212_ALS_DT2_REG 0x0A |
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#define JSA1212_ALS_RNG_REG 0x0B |
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#define JSA1212_MAX_REG 0x0C |
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/* JSA1212 reg masks */ |
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#define JSA1212_CONF_MASK 0xFF |
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#define JSA1212_INT_MASK 0xFF |
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#define JSA1212_PXS_LT_MASK 0xFF |
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#define JSA1212_PXS_HT_MASK 0xFF |
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#define JSA1212_ALS_TH1_MASK 0xFF |
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#define JSA1212_ALS_TH2_LT_MASK 0x0F |
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#define JSA1212_ALS_TH2_HT_MASK 0xF0 |
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#define JSA1212_ALS_TH3_MASK 0xFF |
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#define JSA1212_PXS_DATA_MASK 0xFF |
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#define JSA1212_ALS_DATA_MASK 0x0FFF |
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#define JSA1212_ALS_DT1_MASK 0xFF |
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#define JSA1212_ALS_DT2_MASK 0x0F |
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#define JSA1212_ALS_RNG_MASK 0x07 |
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/* JSA1212 CONF REG bits */ |
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#define JSA1212_CONF_PXS_MASK 0x80 |
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#define JSA1212_CONF_PXS_ENABLE 0x80 |
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#define JSA1212_CONF_PXS_DISABLE 0x00 |
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#define JSA1212_CONF_ALS_MASK 0x04 |
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#define JSA1212_CONF_ALS_ENABLE 0x04 |
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#define JSA1212_CONF_ALS_DISABLE 0x00 |
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#define JSA1212_CONF_IRDR_MASK 0x08 |
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/* Proxmity sensing IRDR current sink settings */ |
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#define JSA1212_CONF_IRDR_200MA 0x08 |
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#define JSA1212_CONF_IRDR_100MA 0x00 |
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#define JSA1212_CONF_PXS_SLP_MASK 0x70 |
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#define JSA1212_CONF_PXS_SLP_0MS 0x70 |
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#define JSA1212_CONF_PXS_SLP_12MS 0x60 |
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#define JSA1212_CONF_PXS_SLP_50MS 0x50 |
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#define JSA1212_CONF_PXS_SLP_75MS 0x40 |
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#define JSA1212_CONF_PXS_SLP_100MS 0x30 |
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#define JSA1212_CONF_PXS_SLP_200MS 0x20 |
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#define JSA1212_CONF_PXS_SLP_400MS 0x10 |
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#define JSA1212_CONF_PXS_SLP_800MS 0x00 |
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/* JSA1212 INT REG bits */ |
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#define JSA1212_INT_CTRL_MASK 0x01 |
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#define JSA1212_INT_CTRL_EITHER 0x00 |
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#define JSA1212_INT_CTRL_BOTH 0x01 |
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#define JSA1212_INT_ALS_PRST_MASK 0x06 |
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#define JSA1212_INT_ALS_PRST_1CONV 0x00 |
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#define JSA1212_INT_ALS_PRST_4CONV 0x02 |
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#define JSA1212_INT_ALS_PRST_8CONV 0x04 |
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#define JSA1212_INT_ALS_PRST_16CONV 0x06 |
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#define JSA1212_INT_ALS_FLAG_MASK 0x08 |
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#define JSA1212_INT_ALS_FLAG_CLR 0x00 |
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#define JSA1212_INT_PXS_PRST_MASK 0x60 |
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#define JSA1212_INT_PXS_PRST_1CONV 0x00 |
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#define JSA1212_INT_PXS_PRST_4CONV 0x20 |
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#define JSA1212_INT_PXS_PRST_8CONV 0x40 |
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#define JSA1212_INT_PXS_PRST_16CONV 0x60 |
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#define JSA1212_INT_PXS_FLAG_MASK 0x80 |
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#define JSA1212_INT_PXS_FLAG_CLR 0x00 |
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/* JSA1212 ALS RNG REG bits */ |
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#define JSA1212_ALS_RNG_0_2048 0x00 |
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#define JSA1212_ALS_RNG_0_1024 0x01 |
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#define JSA1212_ALS_RNG_0_512 0x02 |
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#define JSA1212_ALS_RNG_0_256 0x03 |
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#define JSA1212_ALS_RNG_0_128 0x04 |
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/* JSA1212 INT threshold range */ |
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#define JSA1212_ALS_TH_MIN 0x0000 |
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#define JSA1212_ALS_TH_MAX 0x0FFF |
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#define JSA1212_PXS_TH_MIN 0x00 |
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#define JSA1212_PXS_TH_MAX 0xFF |
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#define JSA1212_ALS_DELAY_MS 200 |
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#define JSA1212_PXS_DELAY_MS 100 |
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#define JSA1212_DRIVER_NAME "jsa1212" |
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#define JSA1212_REGMAP_NAME "jsa1212_regmap" |
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enum jsa1212_op_mode { |
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JSA1212_OPMODE_ALS_EN, |
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JSA1212_OPMODE_PXS_EN, |
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}; |
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struct jsa1212_data { |
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struct i2c_client *client; |
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struct mutex lock; |
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u8 als_rng_idx; |
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bool als_en; /* ALS enable status */ |
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bool pxs_en; /* proximity enable status */ |
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struct regmap *regmap; |
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}; |
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/* ALS range idx to val mapping */ |
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static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128, |
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128, 128, 128}; |
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/* Enables or disables ALS function based on status */ |
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static int jsa1212_als_enable(struct jsa1212_data *data, u8 status) |
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{ |
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int ret; |
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ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG, |
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JSA1212_CONF_ALS_MASK, |
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status); |
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if (ret < 0) |
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return ret; |
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data->als_en = !!status; |
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return 0; |
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} |
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/* Enables or disables PXS function based on status */ |
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static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status) |
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{ |
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int ret; |
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ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG, |
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JSA1212_CONF_PXS_MASK, |
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status); |
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if (ret < 0) |
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return ret; |
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data->pxs_en = !!status; |
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return 0; |
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} |
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static int jsa1212_read_als_data(struct jsa1212_data *data, |
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unsigned int *val) |
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{ |
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int ret; |
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__le16 als_data; |
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ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE); |
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if (ret < 0) |
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return ret; |
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/* Delay for data output */ |
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msleep(JSA1212_ALS_DELAY_MS); |
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/* Read 12 bit data */ |
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ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "als data read err\n"); |
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goto als_data_read_err; |
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} |
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*val = le16_to_cpu(als_data); |
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als_data_read_err: |
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return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE); |
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} |
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static int jsa1212_read_pxs_data(struct jsa1212_data *data, |
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unsigned int *val) |
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{ |
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int ret; |
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unsigned int pxs_data; |
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ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE); |
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if (ret < 0) |
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return ret; |
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/* Delay for data output */ |
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msleep(JSA1212_PXS_DELAY_MS); |
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/* Read out all data */ |
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ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "pxs data read err\n"); |
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goto pxs_data_read_err; |
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} |
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*val = pxs_data & JSA1212_PXS_DATA_MASK; |
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pxs_data_read_err: |
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return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE); |
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} |
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static int jsa1212_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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int ret; |
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struct jsa1212_data *data = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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mutex_lock(&data->lock); |
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switch (chan->type) { |
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case IIO_LIGHT: |
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ret = jsa1212_read_als_data(data, val); |
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break; |
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case IIO_PROXIMITY: |
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ret = jsa1212_read_pxs_data(data, val); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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mutex_unlock(&data->lock); |
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return ret < 0 ? ret : IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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switch (chan->type) { |
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case IIO_LIGHT: |
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*val = jsa1212_als_range_val[data->als_rng_idx]; |
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*val2 = BIT(12); /* Max 12 bit value */ |
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return IIO_VAL_FRACTIONAL; |
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default: |
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break; |
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} |
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break; |
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default: |
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break; |
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} |
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return -EINVAL; |
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} |
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static const struct iio_chan_spec jsa1212_channels[] = { |
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{ |
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.type = IIO_LIGHT, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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}, |
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{ |
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.type = IIO_PROXIMITY, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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} |
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}; |
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static const struct iio_info jsa1212_info = { |
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.read_raw = &jsa1212_read_raw, |
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}; |
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static int jsa1212_chip_init(struct jsa1212_data *data) |
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{ |
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int ret; |
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ret = regmap_write(data->regmap, JSA1212_CONF_REG, |
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(JSA1212_CONF_PXS_SLP_50MS | |
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JSA1212_CONF_IRDR_200MA)); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(data->regmap, JSA1212_INT_REG, |
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JSA1212_INT_ALS_PRST_4CONV); |
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if (ret < 0) |
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return ret; |
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data->als_rng_idx = JSA1212_ALS_RNG_0_2048; |
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return 0; |
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} |
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static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case JSA1212_PXS_DATA_REG: |
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case JSA1212_ALS_DT1_REG: |
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case JSA1212_ALS_DT2_REG: |
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case JSA1212_INT_REG: |
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return true; |
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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 regmap_config jsa1212_regmap_config = { |
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.name = JSA1212_REGMAP_NAME, |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = JSA1212_MAX_REG, |
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.cache_type = REGCACHE_RBTREE, |
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.volatile_reg = jsa1212_is_volatile_reg, |
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}; |
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static int jsa1212_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct jsa1212_data *data; |
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struct iio_dev *indio_dev; |
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struct regmap *regmap; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config); |
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if (IS_ERR(regmap)) { |
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dev_err(&client->dev, "Regmap initialization failed.\n"); |
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return PTR_ERR(regmap); |
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} |
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data = iio_priv(indio_dev); |
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i2c_set_clientdata(client, indio_dev); |
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data->client = client; |
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data->regmap = regmap; |
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mutex_init(&data->lock); |
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ret = jsa1212_chip_init(data); |
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if (ret < 0) |
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return ret; |
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indio_dev->channels = jsa1212_channels; |
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indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels); |
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indio_dev->name = JSA1212_DRIVER_NAME; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->info = &jsa1212_info; |
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ret = iio_device_register(indio_dev); |
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if (ret < 0) |
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dev_err(&client->dev, "%s: register device failed\n", __func__); |
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return ret; |
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} |
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/* power off the device */ |
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static int jsa1212_power_off(struct jsa1212_data *data) |
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{ |
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int ret; |
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mutex_lock(&data->lock); |
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ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG, |
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JSA1212_CONF_ALS_MASK | |
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JSA1212_CONF_PXS_MASK, |
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JSA1212_CONF_ALS_DISABLE | |
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JSA1212_CONF_PXS_DISABLE); |
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if (ret < 0) |
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dev_err(&data->client->dev, "power off cmd failed\n"); |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int jsa1212_remove(struct i2c_client *client) |
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{ |
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struct iio_dev *indio_dev = i2c_get_clientdata(client); |
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struct jsa1212_data *data = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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return jsa1212_power_off(data); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int jsa1212_suspend(struct device *dev) |
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{ |
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struct jsa1212_data *data; |
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
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return jsa1212_power_off(data); |
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} |
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static int jsa1212_resume(struct device *dev) |
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{ |
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int ret = 0; |
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struct jsa1212_data *data; |
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
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mutex_lock(&data->lock); |
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if (data->als_en) { |
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ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE); |
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if (ret < 0) { |
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dev_err(dev, "als resume failed\n"); |
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goto unlock_and_ret; |
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} |
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} |
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if (data->pxs_en) { |
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ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE); |
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if (ret < 0) |
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dev_err(dev, "pxs resume failed\n"); |
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} |
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unlock_and_ret: |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume); |
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#define JSA1212_PM_OPS (&jsa1212_pm_ops) |
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#else |
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#define JSA1212_PM_OPS NULL |
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#endif |
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static const struct acpi_device_id jsa1212_acpi_match[] = { |
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{"JSA1212", 0}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match); |
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static const struct i2c_device_id jsa1212_id[] = { |
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{ JSA1212_DRIVER_NAME, 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, jsa1212_id); |
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static struct i2c_driver jsa1212_driver = { |
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.driver = { |
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.name = JSA1212_DRIVER_NAME, |
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.pm = JSA1212_PM_OPS, |
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.acpi_match_table = ACPI_PTR(jsa1212_acpi_match), |
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}, |
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.probe = jsa1212_probe, |
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.remove = jsa1212_remove, |
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.id_table = jsa1212_id, |
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}; |
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module_i2c_driver(jsa1212_driver); |
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MODULE_AUTHOR("Sathya Kuppuswamy <[email protected]>"); |
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MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver"); |
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MODULE_LICENSE("GPL v2");
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