From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/misc/isl29003.c | 472 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 472 insertions(+) create mode 100644 drivers/misc/isl29003.c (limited to 'drivers/misc/isl29003.c') diff --git a/drivers/misc/isl29003.c b/drivers/misc/isl29003.c new file mode 100644 index 000000000..c9b526a21 --- /dev/null +++ b/drivers/misc/isl29003.c @@ -0,0 +1,472 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * isl29003.c - Linux kernel module for + * Intersil ISL29003 ambient light sensor + * + * See file:Documentation/misc-devices/isl29003.rst + * + * Copyright (c) 2009 Daniel Mack + * + * Based on code written by + * Rodolfo Giometti + * Eurotech S.p.A. + */ + +#include +#include +#include +#include +#include + +#define ISL29003_DRV_NAME "isl29003" +#define DRIVER_VERSION "1.0" + +#define ISL29003_REG_COMMAND 0x00 +#define ISL29003_ADC_ENABLED (1 << 7) +#define ISL29003_ADC_PD (1 << 6) +#define ISL29003_TIMING_INT (1 << 5) +#define ISL29003_MODE_SHIFT (2) +#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT) +#define ISL29003_RES_SHIFT (0) +#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT) + +#define ISL29003_REG_CONTROL 0x01 +#define ISL29003_INT_FLG (1 << 5) +#define ISL29003_RANGE_SHIFT (2) +#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT) +#define ISL29003_INT_PERSISTS_SHIFT (0) +#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT) + +#define ISL29003_REG_IRQ_THRESH_HI 0x02 +#define ISL29003_REG_IRQ_THRESH_LO 0x03 +#define ISL29003_REG_LSB_SENSOR 0x04 +#define ISL29003_REG_MSB_SENSOR 0x05 +#define ISL29003_REG_LSB_TIMER 0x06 +#define ISL29003_REG_MSB_TIMER 0x07 + +#define ISL29003_NUM_CACHABLE_REGS 4 + +struct isl29003_data { + struct i2c_client *client; + struct mutex lock; + u8 reg_cache[ISL29003_NUM_CACHABLE_REGS]; + u8 power_state_before_suspend; +}; + +static int gain_range[] = { + 1000, 4000, 16000, 64000 +}; + +/* + * register access helpers + */ + +static int __isl29003_read_reg(struct i2c_client *client, + u32 reg, u8 mask, u8 shift) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + + return (data->reg_cache[reg] & mask) >> shift; +} + +static int __isl29003_write_reg(struct i2c_client *client, + u32 reg, u8 mask, u8 shift, u8 val) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + int ret = 0; + u8 tmp; + + if (reg >= ISL29003_NUM_CACHABLE_REGS) + return -EINVAL; + + mutex_lock(&data->lock); + + tmp = data->reg_cache[reg]; + tmp &= ~mask; + tmp |= val << shift; + + ret = i2c_smbus_write_byte_data(client, reg, tmp); + if (!ret) + data->reg_cache[reg] = tmp; + + mutex_unlock(&data->lock); + return ret; +} + +/* + * internally used functions + */ + +/* range */ +static int isl29003_get_range(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_CONTROL, + ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT); +} + +static int isl29003_set_range(struct i2c_client *client, int range) +{ + return __isl29003_write_reg(client, ISL29003_REG_CONTROL, + ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range); +} + +/* resolution */ +static int isl29003_get_resolution(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT); +} + +static int isl29003_set_resolution(struct i2c_client *client, int res) +{ + return __isl29003_write_reg(client, ISL29003_REG_COMMAND, + ISL29003_RES_MASK, ISL29003_RES_SHIFT, res); +} + +/* mode */ +static int isl29003_get_mode(struct i2c_client *client) +{ + return __isl29003_read_reg(client, ISL29003_REG_COMMAND, + ISL29003_MODE_MASK, ISL29003_MODE_SHIFT); +} + +static int isl29003_set_mode(struct i2c_client *client, int mode) +{ + return __isl29003_write_reg(client, ISL29003_REG_COMMAND, + ISL29003_MODE_MASK, ISL29003_MODE_SHIFT, mode); +} + +/* power_state */ +static int isl29003_set_power_state(struct i2c_client *client, int state) +{ + return __isl29003_write_reg(client, ISL29003_REG_COMMAND, + ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0, + state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD); +} + +static int isl29003_get_power_state(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND]; + + return ~cmdreg & ISL29003_ADC_PD; +} + +static int isl29003_get_adc_value(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + int lsb, msb, range, bitdepth; + + mutex_lock(&data->lock); + lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR); + + if (lsb < 0) { + mutex_unlock(&data->lock); + return lsb; + } + + msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR); + mutex_unlock(&data->lock); + + if (msb < 0) + return msb; + + range = isl29003_get_range(client); + bitdepth = (4 - isl29003_get_resolution(client)) * 4; + return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth; +} + +/* + * sysfs layer + */ + +/* range */ +static ssize_t isl29003_show_range(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + + return sysfs_emit(buf, "%i\n", isl29003_get_range(client)); +} + +static ssize_t isl29003_store_range(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val > 3) + return -EINVAL; + + ret = isl29003_set_range(client, val); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(range, S_IWUSR | S_IRUGO, + isl29003_show_range, isl29003_store_range); + + +/* resolution */ +static ssize_t isl29003_show_resolution(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + + return sysfs_emit(buf, "%d\n", isl29003_get_resolution(client)); +} + +static ssize_t isl29003_store_resolution(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val > 3) + return -EINVAL; + + ret = isl29003_set_resolution(client, val); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO, + isl29003_show_resolution, isl29003_store_resolution); + +/* mode */ +static ssize_t isl29003_show_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + + return sysfs_emit(buf, "%d\n", isl29003_get_mode(client)); +} + +static ssize_t isl29003_store_mode(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val > 2) + return -EINVAL; + + ret = isl29003_set_mode(client, val); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, + isl29003_show_mode, isl29003_store_mode); + + +/* power state */ +static ssize_t isl29003_show_power_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + + return sysfs_emit(buf, "%d\n", isl29003_get_power_state(client)); +} + +static ssize_t isl29003_store_power_state(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val > 1) + return -EINVAL; + + ret = isl29003_set_power_state(client, val); + return ret ? ret : count; +} + +static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, + isl29003_show_power_state, isl29003_store_power_state); + + +/* lux */ +static ssize_t isl29003_show_lux(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + + /* No LUX data if not operational */ + if (!isl29003_get_power_state(client)) + return -EBUSY; + + return sysfs_emit(buf, "%d\n", isl29003_get_adc_value(client)); +} + +static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL); + +static struct attribute *isl29003_attributes[] = { + &dev_attr_range.attr, + &dev_attr_resolution.attr, + &dev_attr_mode.attr, + &dev_attr_power_state.attr, + &dev_attr_lux.attr, + NULL +}; + +static const struct attribute_group isl29003_attr_group = { + .attrs = isl29003_attributes, +}; + +static int isl29003_init_client(struct i2c_client *client) +{ + struct isl29003_data *data = i2c_get_clientdata(client); + int i; + + /* read all the registers once to fill the cache. + * if one of the reads fails, we consider the init failed */ + for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) { + int v = i2c_smbus_read_byte_data(client, i); + + if (v < 0) + return -ENODEV; + + data->reg_cache[i] = v; + } + + /* set defaults */ + isl29003_set_range(client, 0); + isl29003_set_resolution(client, 0); + isl29003_set_mode(client, 0); + isl29003_set_power_state(client, 0); + + return 0; +} + +/* + * I2C layer + */ + +static int isl29003_probe(struct i2c_client *client) +{ + struct i2c_adapter *adapter = client->adapter; + struct isl29003_data *data; + int err = 0; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) + return -EIO; + + data = kzalloc_obj(struct isl29003_data); + if (!data) + return -ENOMEM; + + data->client = client; + i2c_set_clientdata(client, data); + mutex_init(&data->lock); + + /* initialize the ISL29003 chip */ + err = isl29003_init_client(client); + if (err) + goto exit_kfree; + + /* register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group); + if (err) + goto exit_kfree; + + dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION); + return 0; + +exit_kfree: + kfree(data); + return err; +} + +static void isl29003_remove(struct i2c_client *client) +{ + sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group); + isl29003_set_power_state(client, 0); + kfree(i2c_get_clientdata(client)); +} + +#ifdef CONFIG_PM_SLEEP +static int isl29003_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + + data->power_state_before_suspend = isl29003_get_power_state(client); + return isl29003_set_power_state(client, 0); +} + +static int isl29003_resume(struct device *dev) +{ + int i; + struct i2c_client *client = to_i2c_client(dev); + struct isl29003_data *data = i2c_get_clientdata(client); + + /* restore registers from cache */ + for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) + if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i])) + return -EIO; + + return isl29003_set_power_state(client, + data->power_state_before_suspend); +} + +static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume); +#define ISL29003_PM_OPS (&isl29003_pm_ops) + +#else +#define ISL29003_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static const struct i2c_device_id isl29003_id[] = { + { .name = "isl29003" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, isl29003_id); + +static struct i2c_driver isl29003_driver = { + .driver = { + .name = ISL29003_DRV_NAME, + .pm = ISL29003_PM_OPS, + }, + .probe = isl29003_probe, + .remove = isl29003_remove, + .id_table = isl29003_id, +}; + +module_i2c_driver(isl29003_driver); + +MODULE_AUTHOR("Daniel Mack "); +MODULE_DESCRIPTION("ISL29003 ambient light sensor driver"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(DRIVER_VERSION); -- cgit v1.3.1