468 lines
11 KiB
C
Executable File
468 lines
11 KiB
C
Executable File
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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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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.driver_module = THIS_MODULE,
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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->dev.parent = &client->dev;
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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 <sathyanarayanan.kuppuswamy@linux.intel.com>");
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MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
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MODULE_LICENSE("GPL v2");
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