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cc3db79bb1
Follow the advice of the Documentation/filesystems/sysfs.rst and show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. Signed-off-by: Bo Liu <liubo03@inspur.com> Link: https://lore.kernel.org/r/20230129092357.3143-1-liubo03@inspur.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
473 lines
11 KiB
C
473 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* isl29003.c - Linux kernel module for
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* Intersil ISL29003 ambient light sensor
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*
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* See file:Documentation/misc-devices/isl29003.rst
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*
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* Based on code written by
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* Rodolfo Giometti <giometti@linux.it>
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* Eurotech S.p.A. <info@eurotech.it>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#define ISL29003_DRV_NAME "isl29003"
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#define DRIVER_VERSION "1.0"
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#define ISL29003_REG_COMMAND 0x00
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#define ISL29003_ADC_ENABLED (1 << 7)
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#define ISL29003_ADC_PD (1 << 6)
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#define ISL29003_TIMING_INT (1 << 5)
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#define ISL29003_MODE_SHIFT (2)
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#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT)
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#define ISL29003_RES_SHIFT (0)
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#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT)
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#define ISL29003_REG_CONTROL 0x01
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#define ISL29003_INT_FLG (1 << 5)
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#define ISL29003_RANGE_SHIFT (2)
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#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT)
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#define ISL29003_INT_PERSISTS_SHIFT (0)
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#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT)
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#define ISL29003_REG_IRQ_THRESH_HI 0x02
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#define ISL29003_REG_IRQ_THRESH_LO 0x03
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#define ISL29003_REG_LSB_SENSOR 0x04
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#define ISL29003_REG_MSB_SENSOR 0x05
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#define ISL29003_REG_LSB_TIMER 0x06
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#define ISL29003_REG_MSB_TIMER 0x07
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#define ISL29003_NUM_CACHABLE_REGS 4
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struct isl29003_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
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u8 power_state_before_suspend;
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};
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static int gain_range[] = {
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1000, 4000, 16000, 64000
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};
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/*
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* register access helpers
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*/
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static int __isl29003_read_reg(struct i2c_client *client,
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u32 reg, u8 mask, u8 shift)
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{
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struct isl29003_data *data = i2c_get_clientdata(client);
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return (data->reg_cache[reg] & mask) >> shift;
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}
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static int __isl29003_write_reg(struct i2c_client *client,
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u32 reg, u8 mask, u8 shift, u8 val)
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{
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struct isl29003_data *data = i2c_get_clientdata(client);
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int ret = 0;
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u8 tmp;
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if (reg >= ISL29003_NUM_CACHABLE_REGS)
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return -EINVAL;
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mutex_lock(&data->lock);
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tmp = data->reg_cache[reg];
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tmp &= ~mask;
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tmp |= val << shift;
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ret = i2c_smbus_write_byte_data(client, reg, tmp);
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if (!ret)
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data->reg_cache[reg] = tmp;
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mutex_unlock(&data->lock);
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return ret;
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}
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/*
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* internally used functions
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*/
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/* range */
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static int isl29003_get_range(struct i2c_client *client)
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{
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return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
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ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
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}
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static int isl29003_set_range(struct i2c_client *client, int range)
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{
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return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
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ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
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}
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/* resolution */
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static int isl29003_get_resolution(struct i2c_client *client)
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{
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return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
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ISL29003_RES_MASK, ISL29003_RES_SHIFT);
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}
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static int isl29003_set_resolution(struct i2c_client *client, int res)
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{
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return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
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ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
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}
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/* mode */
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static int isl29003_get_mode(struct i2c_client *client)
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{
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return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
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ISL29003_MODE_MASK, ISL29003_MODE_SHIFT);
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}
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static int isl29003_set_mode(struct i2c_client *client, int mode)
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{
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return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
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ISL29003_MODE_MASK, ISL29003_MODE_SHIFT, mode);
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}
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/* power_state */
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static int isl29003_set_power_state(struct i2c_client *client, int state)
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{
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return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
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ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0,
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state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
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}
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static int isl29003_get_power_state(struct i2c_client *client)
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{
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struct isl29003_data *data = i2c_get_clientdata(client);
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u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];
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return ~cmdreg & ISL29003_ADC_PD;
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}
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static int isl29003_get_adc_value(struct i2c_client *client)
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{
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struct isl29003_data *data = i2c_get_clientdata(client);
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int lsb, msb, range, bitdepth;
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mutex_lock(&data->lock);
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lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
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if (lsb < 0) {
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mutex_unlock(&data->lock);
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return lsb;
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}
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msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
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mutex_unlock(&data->lock);
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if (msb < 0)
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return msb;
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range = isl29003_get_range(client);
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bitdepth = (4 - isl29003_get_resolution(client)) * 4;
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return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth;
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}
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/*
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* sysfs layer
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*/
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/* range */
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static ssize_t isl29003_show_range(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return sysfs_emit(buf, "%i\n", isl29003_get_range(client));
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}
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static ssize_t isl29003_store_range(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 3)
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return -EINVAL;
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ret = isl29003_set_range(client, val);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR(range, S_IWUSR | S_IRUGO,
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isl29003_show_range, isl29003_store_range);
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/* resolution */
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static ssize_t isl29003_show_resolution(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return sysfs_emit(buf, "%d\n", isl29003_get_resolution(client));
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}
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static ssize_t isl29003_store_resolution(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 3)
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return -EINVAL;
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ret = isl29003_set_resolution(client, val);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO,
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isl29003_show_resolution, isl29003_store_resolution);
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/* mode */
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static ssize_t isl29003_show_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return sysfs_emit(buf, "%d\n", isl29003_get_mode(client));
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}
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static ssize_t isl29003_store_mode(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 2)
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return -EINVAL;
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ret = isl29003_set_mode(client, val);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
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isl29003_show_mode, isl29003_store_mode);
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/* power state */
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static ssize_t isl29003_show_power_state(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return sysfs_emit(buf, "%d\n", isl29003_get_power_state(client));
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}
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static ssize_t isl29003_store_power_state(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 1)
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return -EINVAL;
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ret = isl29003_set_power_state(client, val);
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return ret ? ret : count;
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}
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static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
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isl29003_show_power_state, isl29003_store_power_state);
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/* lux */
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static ssize_t isl29003_show_lux(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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/* No LUX data if not operational */
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if (!isl29003_get_power_state(client))
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return -EBUSY;
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return sysfs_emit(buf, "%d\n", isl29003_get_adc_value(client));
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}
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static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);
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static struct attribute *isl29003_attributes[] = {
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&dev_attr_range.attr,
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&dev_attr_resolution.attr,
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&dev_attr_mode.attr,
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&dev_attr_power_state.attr,
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&dev_attr_lux.attr,
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NULL
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};
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static const struct attribute_group isl29003_attr_group = {
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.attrs = isl29003_attributes,
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};
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static int isl29003_init_client(struct i2c_client *client)
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{
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struct isl29003_data *data = i2c_get_clientdata(client);
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int i;
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/* read all the registers once to fill the cache.
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* if one of the reads fails, we consider the init failed */
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for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
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int v = i2c_smbus_read_byte_data(client, i);
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if (v < 0)
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return -ENODEV;
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data->reg_cache[i] = v;
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}
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/* set defaults */
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isl29003_set_range(client, 0);
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isl29003_set_resolution(client, 0);
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isl29003_set_mode(client, 0);
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isl29003_set_power_state(client, 0);
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return 0;
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}
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/*
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* I2C layer
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*/
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static int isl29003_probe(struct i2c_client *client)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct isl29003_data *data;
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int err = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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return -EIO;
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data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = client;
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i2c_set_clientdata(client, data);
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mutex_init(&data->lock);
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/* initialize the ISL29003 chip */
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err = isl29003_init_client(client);
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if (err)
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goto exit_kfree;
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/* register sysfs hooks */
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err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
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if (err)
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goto exit_kfree;
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dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
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return 0;
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exit_kfree:
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kfree(data);
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return err;
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}
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static void isl29003_remove(struct i2c_client *client)
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{
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sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
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isl29003_set_power_state(client, 0);
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kfree(i2c_get_clientdata(client));
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}
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#ifdef CONFIG_PM_SLEEP
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static int isl29003_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct isl29003_data *data = i2c_get_clientdata(client);
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data->power_state_before_suspend = isl29003_get_power_state(client);
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return isl29003_set_power_state(client, 0);
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}
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static int isl29003_resume(struct device *dev)
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{
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int i;
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struct i2c_client *client = to_i2c_client(dev);
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struct isl29003_data *data = i2c_get_clientdata(client);
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/* restore registers from cache */
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for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
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if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
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return -EIO;
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return isl29003_set_power_state(client,
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data->power_state_before_suspend);
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}
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static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
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#define ISL29003_PM_OPS (&isl29003_pm_ops)
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#else
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#define ISL29003_PM_OPS NULL
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#endif /* CONFIG_PM_SLEEP */
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static const struct i2c_device_id isl29003_id[] = {
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{ "isl29003", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, isl29003_id);
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static struct i2c_driver isl29003_driver = {
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.driver = {
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.name = ISL29003_DRV_NAME,
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.pm = ISL29003_PM_OPS,
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},
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.probe_new = isl29003_probe,
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.remove = isl29003_remove,
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.id_table = isl29003_id,
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};
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module_i2c_driver(isl29003_driver);
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
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MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
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MODULE_LICENSE("GPL v2");
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MODULE_VERSION(DRIVER_VERSION);
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