Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751685AbbAAASN (ORCPT ); Wed, 31 Dec 2014 19:18:13 -0500 Received: from smtp105.biz.mail.bf1.yahoo.com ([98.139.221.43]:23704 "EHLO smtp105.biz.mail.bf1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751636AbbAAASK (ORCPT ); Wed, 31 Dec 2014 19:18:10 -0500 X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: qckIGXYVM1km__ryKjd9mQvd4Nwa87i8qumG5.WoCEDWFjP ssXVyRYUfXXD1MDUpoD8gy7QXUlQyzQb1nOR4vro7TtPOApYAOD4FIo0xdUG JKW9azf4IVWqbKpJMO8UNTESSi5FqW1V5Zbs.nRInVdA4Znb0LBOt6YMPZr5 QXZW4rW0c8H0HtZMdcPN8JgsO9rOU3CnEHGjbZwNXjQBEJ4G_lZWaiFfjb0r fTeXEOO3c8nCHko4y7Aio8bDZGg0NVZ5DN4kPgun34KLWPG27AoIOCHWEjdk t81Hqr.XWSja948SLUUFrcs3J1WdWJCuZeVtQkHWsgp_pZevlhLj1zddaqBp VT_RaeR.WiPuuKNx5EqgSvKWh.r4t6968AXktqYav3oHDeQY9S9NWOtYMnFn R.AoRJSX156DYHs6JZFHc3LB934P2rOgX3dx3UrET0f3Xfq.LQ9_AGEFt1_V K9owoXtmmgPpG59ZJouIVLLvSG67GilA1WIM9Jzy6kVAdwZiEv0M- X-Yahoo-SMTP: oqiDtsaswBDv2aVUlxVTYPpATqA- From: Kevin Tsai To: Kevin Tsai , Wolfram Sang , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald , Grant Likely , Andrew Morton , "David S. Miller" , Greg Kroah-Hartman , Joe Perches , Mauro Carvalho Chehab , Antti Palosaari , Daniel Baluta , Archana Patni Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V1 1/1] iio: Added Capella cm3232 ambient light sensor driver. Date: Wed, 31 Dec 2014 16:10:30 -0800 Message-Id: <1420071030-888-1-git-send-email-ktsai@capellamicro.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 14041 Lines: 495 CM3232 is an advanced ambient light sensor with I2C protocol interface. The I2C slave address is internally hardwired as 0x10 (7-bit). Writing to configure register is byte mode, but reading ALS register requests to use word mode for 16-bit resolution. Signed-off-by: Kevin Tsai --- .../devicetree/bindings/i2c/trivial-devices.txt | 1 + MAINTAINERS | 6 + drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/cm3232.c | 403 +++++++++++++++++++++ 5 files changed, 422 insertions(+) create mode 100644 drivers/iio/light/cm3232.c diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt index 9f4e382..572a7c4 100644 --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt @@ -34,6 +34,7 @@ atmel,24c512 i2c serial eeprom (24cxx) atmel,24c1024 i2c serial eeprom (24cxx) atmel,at97sc3204t i2c trusted platform module (TPM) capella,cm32181 CM32181: Ambient Light Sensor +capella,cm3232 CM3232: Ambient Light Sensor catalyst,24c32 i2c serial eeprom cirrus,cs42l51 Cirrus Logic CS42L51 audio codec dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock diff --git a/MAINTAINERS b/MAINTAINERS index ddb9ac8..06a613a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2378,6 +2378,12 @@ F: security/capability.c F: security/commoncap.c F: kernel/capability.c +CAPELLA MICROSYSTEMS LIGHT SENSOR DRIVER +M: Kevin Tsai +S: Maintained +F: drivers/iio/light/cm* +F: Documentation/devicetree/bindings/i2c/trivial-devices.txt + CC2520 IEEE-802.15.4 RADIO DRIVER M: Varka Bhadram L: linux-wpan@vger.kernel.org diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 5bea821..d2318e2 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -48,6 +48,17 @@ config CM32181 To compile this driver as a module, choose M here: the module will be called cm32181. +config CM3232 + depends on I2C + tristate "CM3232 driver" + help + Say Y here if you use cm3232. + This option enables ambient light sensor using + Capella Microsystems cm3232 device driver. + + To compile this driver as a module, choose M here: + the module will be called cm3232. + config CM36651 depends on I2C tristate "CM36651 driver" diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 47877a3..f2c8d55 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_ADJD_S311) += adjd_s311.o obj-$(CONFIG_AL3320A) += al3320a.o obj-$(CONFIG_APDS9300) += apds9300.o obj-$(CONFIG_CM32181) += cm32181.o +obj-$(CONFIG_CM3232) += cm3232.o obj-$(CONFIG_CM36651) += cm36651.o obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o diff --git a/drivers/iio/light/cm3232.c b/drivers/iio/light/cm3232.c new file mode 100644 index 0000000..fd98eeb --- /dev/null +++ b/drivers/iio/light/cm3232.c @@ -0,0 +1,403 @@ +/* + * Copyright (C) 2014 Capella Microsystems Inc. + * Author: Kevin Tsai + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2, as published + * by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Registers Address */ +#define CM3232_REG_ADDR_CMD 0x00 +#define CM3232_REG_ADDR_ALS 0x50 +#define CM3232_REG_ADDR_ID 0x53 + +/* CMD register */ +#define CM3232_CMD_ALS_DISABLE BIT(0) +#define CM3232_CMD_ALS_HS BIT(1) + +#define CM3232_CMD_ALS_IT_SHIFT 2 +#define CM3232_CMD_ALS_IT_MASK (0x07 << CM3232_CMD_ALS_IT_SHIFT) +#define CM3232_CMD_ALS_IT_DEFAULT (0x01 << CM3232_CMD_ALS_IT_SHIFT) + +#define CM3232_CMD_ALS_RESET BIT(6) + +#define CM3232_CMD_DEFAULT CM3232_CMD_ALS_IT_DEFAULT + +#define CM3232_CALIBSCALE_DEFAULT 100000 +#define CM3232_CALIBSCALE_RESOLUTION 100000 +#define CM3232_MLUX_PER_LUX 1000 + +#define CM3232_MLUX_PER_BIT_DEFAULT 64 +#define CM3232_MLUX_PER_BIT_BASE_IT 100000 +static const int CM3232_als_it_bits[] = { 0, 1, 2, 3, 4, 5}; +static const int CM3232_als_it_values[] = { + 100000, 200000, 400000, 800000, 1600000, 3200000}; + +struct cm3232_als_info { + u32 id; + int calibscale; + int mlux_per_bit; + int mlux_per_bit_base_it; + const int *als_it_bits; + const int *als_it_values; + const int num_als_it; + int als_raw; +}; + +static struct cm3232_als_info cm3232_als_info_default = { + .id = 3232, + .calibscale = CM3232_CALIBSCALE_DEFAULT, + .mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT, + .mlux_per_bit_base_it = CM3232_MLUX_PER_BIT_BASE_IT, + .als_it_bits = CM3232_als_it_bits, + .als_it_values = CM3232_als_it_values, + .num_als_it = ARRAY_SIZE(CM3232_als_it_bits), +}; + +struct cm3232_chip { + struct i2c_client *client; + struct mutex lock; + struct cm3232_als_info *als_info; + u8 regs_cmd; +}; + +static int cm3232_get_lux(struct cm3232_chip *chip); +static int cm3232_read_als_it(struct cm3232_chip *chip, int *val2); + +/** + * cm3232_reg_init() - Initialize CM3232 registers + * @chip: pointer of struct cm3232. + * + * Initialize CM3232 ambient light sensor register to default values. + * + Return: 0 for success; otherwise for error code. + */ +static int cm3232_reg_init(struct cm3232_chip *chip) +{ + struct i2c_client *client = chip->client; + struct cm3232_als_info *als_info; + s32 ret; + + /* Identify device */ + ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID); + if (ret < 0) + return ret; + if ((ret & 0xFF) != 0x32) + return -ENODEV; + + /* Disable and reset device */ + chip->regs_cmd = CM3232_CMD_ALS_DISABLE | CM3232_CMD_ALS_RESET; + ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD, + chip->regs_cmd); + if (ret < 0) + return ret; + + /* Initialization */ + als_info = chip->als_info = &cm3232_als_info_default; + chip->regs_cmd = CM3232_CMD_DEFAULT; + + /* Configure register */ + ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD, + chip->regs_cmd); + if (ret < 0) + return ret; + + return 0; +} + +/** + * cm3232_read_als_it() - Get sensor integration time (ms) + * @chip: pointer of struct cm3232 + * @val2: pointer of int to load the als_it value. + * + * Report the current integration time in milliseconds. + * + * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL. + */ +static int cm3232_read_als_it(struct cm3232_chip *chip, int *val2) +{ + struct cm3232_als_info *als_info = chip->als_info; + u16 als_it; + int i; + + als_it = chip->regs_cmd; + als_it &= CM3232_CMD_ALS_IT_MASK; + als_it >>= CM3232_CMD_ALS_IT_SHIFT; + for (i = 0; i < als_info->num_als_it; i++) { + if (als_it == als_info->als_it_bits[i]) { + *val2 = als_info->als_it_values[i]; + return IIO_VAL_INT_PLUS_MICRO; + } + } + + return -EINVAL; +} + +/** + * cm3232_write_als_it() - Write sensor integration time + * @chip: pointer of struct cm3232. + * @val: integration time in milliseconds. + * + * Convert integration time (ms) to sensor value. + * + * Return: i2c_smbus_write_word_data command return value. + */ +static int cm3232_write_als_it(struct cm3232_chip *chip, int val) +{ + struct i2c_client *client = chip->client; + struct cm3232_als_info *als_info = chip->als_info; + u16 als_it; + int ret, i; + + for (i = 0; i < als_info->num_als_it; i++) + if (val <= als_info->als_it_values[i]) + break; + if (i >= als_info->num_als_it) + i = als_info->num_als_it - 1; + + als_it = als_info->als_it_bits[i]; + als_it <<= CM3232_CMD_ALS_IT_SHIFT; + + mutex_lock(&chip->lock); + chip->regs_cmd &= ~CM3232_CMD_ALS_IT_MASK; + chip->regs_cmd |= als_it; + ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD, + chip->regs_cmd); + mutex_unlock(&chip->lock); + + return ret; +} + +/** + * cm3232_get_lux() - report current lux value + * @chip: pointer of struct cm3232. + * + * Convert sensor raw data to lux. It depends on integration + * time and calibscale variable. + * + * Return: Positive value is lux, otherwise is error code. + */ +static int cm3232_get_lux(struct cm3232_chip *chip) +{ + struct i2c_client *client = chip->client; + struct cm3232_als_info *als_info = chip->als_info; + int ret; + int als_it; + u64 tmp; + + /* Calculate mlux per bit based on als_it */ + ret = cm3232_read_als_it(chip, &als_it); + if (ret < 0) + return -EINVAL; + tmp = (__force u64)als_info->mlux_per_bit; + tmp *= als_info->mlux_per_bit_base_it; + tmp = div_u64 (tmp, als_it); + + /* Get als_raw */ + als_info->als_raw = i2c_smbus_read_word_data( + client, + CM3232_REG_ADDR_ALS); + if (als_info->als_raw < 0) + return als_info->als_raw; + + tmp *= als_info->als_raw; + tmp *= als_info->calibscale; + tmp = div_u64(tmp, CM3232_CALIBSCALE_RESOLUTION); + tmp = div_u64(tmp, CM3232_MLUX_PER_LUX); + + if (tmp > 0xFFFF) + tmp = 0xFFFF; + + return (int)tmp; +} + +static int cm3232_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct cm3232_chip *chip = iio_priv(indio_dev); + struct cm3232_als_info *als_info = chip->als_info; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + ret = cm3232_get_lux(chip); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_CALIBSCALE: + *val = als_info->calibscale; + return IIO_VAL_INT; + case IIO_CHAN_INFO_INT_TIME: + *val = 0; + ret = cm3232_read_als_it(chip, val2); + return ret; + } + + return -EINVAL; +} + +static int cm3232_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct cm3232_chip *chip = iio_priv(indio_dev); + struct cm3232_als_info *als_info = chip->als_info; + long ms; + + switch (mask) { + case IIO_CHAN_INFO_CALIBSCALE: + als_info->calibscale = val; + return val; + case IIO_CHAN_INFO_INT_TIME: + ms = val * 1000000 + val2; + return cm3232_write_als_it(chip, (int)ms); + } + + return -EINVAL; +} + +/** + * cm3232_get_it_available() - Get available ALS IT value + * @dev: pointer of struct device. + * @attr: pointer of struct device_attribute. + * @buf: pointer of return string buffer. + * + * Display the available integration time in milliseconds. + * + * Return: string length. + */ +static ssize_t cm3232_get_it_available(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cm3232_chip *chip = iio_priv(dev_to_iio_dev(dev)); + struct cm3232_als_info *als_info = chip->als_info; + int i, len; + + for (i = 0, len = 0; i < als_info->num_als_it; i++) + len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", + als_info->als_it_values[i]/1000000, + als_info->als_it_values[i]%1000000); + return len + scnprintf(buf + len, PAGE_SIZE - len, "\n"); +} + +static const struct iio_chan_spec cm3232_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_CALIBSCALE) | + BIT(IIO_CHAN_INFO_INT_TIME), + } +}; + +static IIO_DEVICE_ATTR(in_illuminance_integration_time_available, + S_IRUGO, cm3232_get_it_available, NULL, 0); + +static struct attribute *cm3232_attributes[] = { + &iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group cm3232_attribute_group = { + .attrs = cm3232_attributes +}; + +static const struct iio_info cm3232_info = { + .driver_module = THIS_MODULE, + .read_raw = &cm3232_read_raw, + .write_raw = &cm3232_write_raw, + .attrs = &cm3232_attribute_group, +}; + +static int cm3232_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct cm3232_chip *chip; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); + if (!indio_dev) { + dev_err(&client->dev, "devm_iio_device_alloc failed\n"); + return -ENOMEM; + } + + chip = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + chip->client = client; + + mutex_init(&chip->lock); + indio_dev->dev.parent = &client->dev; + indio_dev->channels = cm3232_channels; + indio_dev->num_channels = ARRAY_SIZE(cm3232_channels); + indio_dev->info = &cm3232_info; + if (id && id->name) + indio_dev->name = id->name; + else + indio_dev->name = (char *)dev_name(&client->dev); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = cm3232_reg_init(chip); + if (ret) { + dev_err(&client->dev, + "%s: register init failed\n", + __func__); + return ret; + } + + ret = iio_device_register(indio_dev); + return 0; +} + +static int cm3232_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + return 0; +} + +static const struct i2c_device_id cm3232_id[] = { + { "cm3232", 0}, + { } +}; + +MODULE_DEVICE_TABLE(i2c, cm3232_id); + +static const struct of_device_id cm3232_of_match[] = { + { .compatible = "capella,cm3232" }, + { } +}; + +static struct i2c_driver cm3232_driver = { + .driver = { + .name = "cm3232", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(cm3232_of_match), + }, + .id_table = cm3232_id, + .probe = cm3232_probe, + .remove = cm3232_remove, +}; + +module_i2c_driver(cm3232_driver); + +MODULE_AUTHOR("Kevin Tsai "); +MODULE_DESCRIPTION("CM3232 ambient light sensor driver"); +MODULE_LICENSE("GPL"); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/