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path: root/kernel/auditsc.c
AgeCommit message (Expand)Author
2008-04-19Audit: internally use the new LSM audit hooksAhmed S. Darwish
2008-04-19Audit: use new LSM hooks instead of SELinux exportsAhmed S. Darwish
2008-03-01[PATCH] Audit: Fix the format type for size_t variablesPaul Moore
2008-02-18Audit: use == not = in if statementsEric Paris
2008-02-14d_path: Use struct path in struct avc_audit_dataJan Blunck
2008-02-14Use struct path in fs_structJan Blunck
2008-02-01[AUDIT] create context if auditing was ever enabledEric Paris
2008-02-01[AUDIT] break large execve argument logging into smaller messagesEric Paris
2008-02-01[AUDIT] do not panic on exclude messages in audit_log_pid_context()Eric Paris
2008-02-01[AUDIT] Add End of Event recordEric Paris
2008-02-01[AUDIT] add session id to audit messagesEric Paris
2008-02-01[AUDIT] collect uid, loginuid, and comm in OBJ_PID recordsEric Paris
2008-02-01[AUDIT] return EINTR not ERESTART*Eric Paris
2008-02-01[PATCH] get rid of loginuid racesAl Viro
2008-02-01[PATCH] switch audit_get_loginuid() to task_struct *Al Viro
2007-10-22auditsc: fix kernel-doc param warningsRandy Dunlap
2007-10-21[PATCH] audit: watching subtreesAl Viro
2007-10-21[PATCH] pass dentry to audit_inode()/audit_inode_child()Al Viro
2007-10-18whitespace fixes: syscall auditingDaniel Walker
2007-10-17Clean up duplicate includes in kernel/Jesper Juhl
2007-10-09SUNRPC: Convert rpc_pipefs to use the generic filesystem notification hooksTrond Myklebust
2007-08-22kernel/auditsc.c: fix an off-by-oneAdrian Bunk
2007-08-07fix oops in __audit_signal_info()Al Viro
2007-07-28audit: fix two bugs in the new execve audit codePeter Zijlstra
2007-07-22[PATCH] get rid of AVC_PATH postponed treatmentAl Viro
2007-07-22[PATCH] Make IPC mode consistentSteve Grubb
2007-07-19mm: variable length argument supportOllie Wild
2007-07-19audit: rework execve auditPeter Zijlstra
2007-07-16kerneldoc fix in audit_core_dumpsHenrik Kretzschmar
2007-07-16Audit: add TTY input auditingMiloslav Trmac
2007-05-11[PATCH] Abnormal End of ProcessesSteve Grubb
2007-05-11[PATCH] match audit name dataAmy Griffis
2007-05-11[PATCH] complete message queue auditingAmy Griffis
2007-05-11[PATCH] initialize name osidAmy Griffis
2007-05-11[PATCH] audit signal recipientsAmy Griffis
2007-05-11[PATCH] auditing ptraceAl Viro
2007-03-14[PATCH] fix deadlock in audit_log_task_context()Al Viro
2007-02-17[PATCH] AUDIT_FD_PAIRAl Viro
2006-12-08[PATCH] struct path: convert kernelJosef Sipek
2006-12-08[PATCH] tty: ->signal->tty lockingPeter Zijlstra
2006-12-06audit: Add auditing to ipsecJoy Latten
2006-12-04[PATCH] severing skbuff.h -> highmem.hAl Viro
2006-10-04[PATCH] name_count array overrunSteve Grubb
2006-10-04[PATCH] PPID filtering fixAlexander Viro
2006-09-29[PATCH] audit/accounting: tty lockingAlan Cox
2006-09-26[PATCH] selinux: rename selinux_ctxid_to_stringStephen Smalley
2006-09-26[PATCH] selinux: eliminate selinux_task_ctxidStephen Smalley
2006-09-11[PATCH] audit: AUDIT_PERM supportAl Viro
2006-08-03[PATCH] take filling ->pid, etc. out of audit_get_context()Al Viro
2006-08-03[PATCH] don't bother with aux entires for dummy contextAl Viro
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// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for ISSI IS31FL32xx family of I2C LED controllers
 *
 * Copyright 2015 Allworx Corp.
 *
 * Datasheets:
 *   http://www.issi.com/US/product-analog-fxled-driver.shtml
 *   http://www.si-en.com/product.asp?parentid=890
 */

#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>

/* Used to indicate a device has no such register */
#define IS31FL32XX_REG_NONE 0xFF

/* Software Shutdown bit in Shutdown Register */
#define IS31FL32XX_SHUTDOWN_SSD_ENABLE  0
#define IS31FL32XX_SHUTDOWN_SSD_DISABLE BIT(0)

/* IS31FL3216 has a number of unique registers */
#define IS31FL3216_CONFIG_REG 0x00
#define IS31FL3216_LIGHTING_EFFECT_REG 0x03
#define IS31FL3216_CHANNEL_CONFIG_REG 0x04

/* Software Shutdown bit in 3216 Config Register */
#define IS31FL3216_CONFIG_SSD_ENABLE  BIT(7)
#define IS31FL3216_CONFIG_SSD_DISABLE 0

struct is31fl32xx_priv;
struct is31fl32xx_led_data {
	struct led_classdev cdev;
	u8 channel; /* 1-based, max priv->cdef->channels */
	struct is31fl32xx_priv *priv;
};

struct is31fl32xx_priv {
	const struct is31fl32xx_chipdef *cdef;
	struct i2c_client *client;
	unsigned int num_leds;
	struct is31fl32xx_led_data leds[0];
};

/**
 * struct is31fl32xx_chipdef - chip-specific attributes
 * @channels            : Number of LED channels
 * @shutdown_reg        : address of Shutdown register (optional)
 * @pwm_update_reg      : address of PWM Update register
 * @global_control_reg  : address of Global Control register (optional)
 * @reset_reg           : address of Reset register (optional)
 * @pwm_register_base   : address of first PWM register
 * @pwm_registers_reversed: : true if PWM registers count down instead of up
 * @led_control_register_base : address of first LED control register (optional)
 * @enable_bits_per_led_control_register: number of LEDs enable bits in each
 * @reset_func:         : pointer to reset function
 *
 * For all optional register addresses, the sentinel value %IS31FL32XX_REG_NONE
 * indicates that this chip has no such register.
 *
 * If non-NULL, @reset_func will be called during probing to set all
 * necessary registers to a known initialization state. This is needed
 * for chips that do not have a @reset_reg.
 *
 * @enable_bits_per_led_control_register must be >=1 if
 * @led_control_register_base != %IS31FL32XX_REG_NONE.
 */
struct is31fl32xx_chipdef {
	u8	channels;
	u8	shutdown_reg;
	u8	pwm_update_reg;
	u8	global_control_reg;
	u8	reset_reg;
	u8	pwm_register_base;
	bool	pwm_registers_reversed;
	u8	led_control_register_base;
	u8	enable_bits_per_led_control_register;
	int (*reset_func)(struct is31fl32xx_priv *priv);
	int (*sw_shutdown_func)(struct is31fl32xx_priv *priv, bool enable);
};

static const struct is31fl32xx_chipdef is31fl3236_cdef = {
	.channels				= 36,
	.shutdown_reg				= 0x00,
	.pwm_update_reg				= 0x25,
	.global_control_reg			= 0x4a,
	.reset_reg				= 0x4f,
	.pwm_register_base			= 0x01,
	.led_control_register_base		= 0x26,
	.enable_bits_per_led_control_register	= 1,
};

static const struct is31fl32xx_chipdef is31fl3235_cdef = {
	.channels				= 28,
	.shutdown_reg				= 0x00,
	.pwm_update_reg				= 0x25,
	.global_control_reg			= 0x4a,
	.reset_reg				= 0x4f,
	.pwm_register_base			= 0x05,
	.led_control_register_base		= 0x2a,
	.enable_bits_per_led_control_register	= 1,
};

static const struct is31fl32xx_chipdef is31fl3218_cdef = {
	.channels				= 18,
	.shutdown_reg				= 0x00,
	.pwm_update_reg				= 0x16,
	.global_control_reg			= IS31FL32XX_REG_NONE,
	.reset_reg				= 0x17,
	.pwm_register_base			= 0x01,
	.led_control_register_base		= 0x13,
	.enable_bits_per_led_control_register	= 6,
};

static int is31fl3216_reset(struct is31fl32xx_priv *priv);
static int is31fl3216_software_shutdown(struct is31fl32xx_priv *priv,
					bool enable);
static const struct is31fl32xx_chipdef is31fl3216_cdef = {
	.channels				= 16,
	.shutdown_reg				= IS31FL32XX_REG_NONE,
	.pwm_update_reg				= 0xB0,
	.global_control_reg			= IS31FL32XX_REG_NONE,
	.reset_reg				= IS31FL32XX_REG_NONE,
	.pwm_register_base			= 0x10,
	.pwm_registers_reversed			= true,
	.led_control_register_base		= 0x01,
	.enable_bits_per_led_control_register	= 8,
	.reset_func				= is31fl3216_reset,
	.sw_shutdown_func			= is31fl3216_software_shutdown,
};

static int is31fl32xx_write(struct is31fl32xx_priv *priv, u8 reg, u8 val)
{
	int ret;

	dev_dbg(&priv->client->dev, "writing register 0x%02X=0x%02X", reg, val);

	ret =  i2c_smbus_write_byte_data(priv->client, reg, val);
	if (ret) {
		dev_err(&priv->client->dev,
			"register write to 0x%02X failed (error %d)",
			reg, ret);
	}
	return ret;
}

/*
 * Custom reset function for IS31FL3216 because it does not have a RESET
 * register the way that the other IS31FL32xx chips do. We don't bother
 * writing the GPIO and animation registers, because the registers we
 * do write ensure those will have no effect.
 */
static int is31fl3216_reset(struct is31fl32xx_priv *priv)
{
	unsigned int i;
	int ret;

	ret = is31fl32xx_write(priv, IS31FL3216_CONFIG_REG,
			       IS31FL3216_CONFIG_SSD_ENABLE);
	if (ret)
		return ret;
	for (i = 0; i < priv->cdef->channels; i++) {
		ret = is31fl32xx_write(priv, priv->cdef->pwm_register_base+i,
				       0x00);
		if (ret)
			return ret;
	}
	ret = is31fl32xx_write(priv, priv->cdef->pwm_update_reg, 0);
	if (ret)
		return ret;
	ret = is31fl32xx_write(priv, IS31FL3216_LIGHTING_EFFECT_REG, 0x00);
	if (ret)
		return ret;
	ret = is31fl32xx_write(priv, IS31FL3216_CHANNEL_CONFIG_REG, 0x00);
	if (ret)
		return ret;

	return 0;
}

/*
 * Custom Software-Shutdown function for IS31FL3216 because it does not have
 * a SHUTDOWN register the way that the other IS31FL32xx chips do.
 * We don't bother doing a read/modify/write on the CONFIG register because
 * we only ever use a value of '0' for the other fields in that register.
 */
static int is31fl3216_software_shutdown(struct is31fl32xx_priv *priv,
					bool enable)
{
	u8 value = enable ? IS31FL3216_CONFIG_SSD_ENABLE :
			    IS31FL3216_CONFIG_SSD_DISABLE;

	return is31fl32xx_write(priv, IS31FL3216_CONFIG_REG, value);
}

/*
 * NOTE: A mutex is not needed in this function because:
 * - All referenced data is read-only after probe()
 * - The I2C core has a mutex on to protect the bus
 * - There are no read/modify/write operations
 * - Intervening operations between the write of the PWM register
 *   and the Update register are harmless.
 *
 * Example:
 *	PWM_REG_1 write 16
 *	UPDATE_REG write 0
 *	PWM_REG_2 write 128
 *	UPDATE_REG write 0
 *   vs:
 *	PWM_REG_1 write 16
 *	PWM_REG_2 write 128
 *	UPDATE_REG write 0
 *	UPDATE_REG write 0
 * are equivalent. Poking the Update register merely applies all PWM
 * register writes up to that point.
 */
static int is31fl32xx_brightness_set(struct led_classdev *led_cdev,
				     enum led_brightness brightness)
{
	const struct is31fl32xx_led_data *led_data =
		container_of(led_cdev, struct is31fl32xx_led_data, cdev);
	const struct is31fl32xx_chipdef *cdef = led_data->priv->cdef;
	u8 pwm_register_offset;
	int ret;

	dev_dbg(led_cdev->dev, "%s: %d\n", __func__, brightness);

	/* NOTE: led_data->channel is 1-based */
	if (cdef->pwm_registers_reversed)
		pwm_register_offset = cdef->channels - led_data->channel;
	else
		pwm_register_offset = led_data->channel - 1;

	ret = is31fl32xx_write(led_data->priv,
			       cdef->pwm_register_base + pwm_register_offset,
			       brightness);
	if (ret)
		return ret;

	return is31fl32xx_write(led_data->priv, cdef->pwm_update_reg, 0);
}

static int is31fl32xx_reset_regs(struct is31fl32xx_priv *priv)
{
	const struct is31fl32xx_chipdef *cdef = priv->cdef;
	int ret;

	if (cdef->reset_reg != IS31FL32XX_REG_NONE) {
		ret = is31fl32xx_write(priv, cdef->reset_reg, 0);
		if (ret)
			return ret;
	}

	if (cdef->reset_func)
		return cdef->reset_func(priv);

	return 0;
}

static int is31fl32xx_software_shutdown(struct is31fl32xx_priv *priv,
					bool enable)
{
	const struct is31fl32xx_chipdef *cdef = priv->cdef;
	int ret;

	if (cdef->shutdown_reg != IS31FL32XX_REG_NONE) {
		u8 value = enable ? IS31FL32XX_SHUTDOWN_SSD_ENABLE :
				    IS31FL32XX_SHUTDOWN_SSD_DISABLE;
		ret = is31fl32xx_write(priv, cdef->shutdown_reg