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linux/drivers/leds/leds-is31fl32xx.c
Rob Herring 3192f14124 leds: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174651.4058753-1-robh@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
2023-07-28 10:02:32 +01:00

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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>
/* 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[];
};
/**
* 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
* @sw_shutdown_func : pointer to software shutdown 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, value);
if (ret)
return ret;
}
if (cdef->sw_shutdown_func)
return cdef->sw_shutdown_func(priv, enable);
return 0;
}
static int is31fl32xx_init_regs(struct is31fl32xx_priv *priv)
{
const struct is31fl32xx_chipdef *cdef = priv->cdef;
int ret;
ret = is31fl32xx_reset_regs(priv);
if (ret)
return ret;
/*
* Set enable bit for all channels.
* We will control state with PWM registers alone.
*/
if (cdef->led_control_register_base != IS31FL32XX_REG_NONE) {
u8 value =
GENMASK(cdef->enable_bits_per_led_control_register-1, 0);
u8 num_regs = cdef->channels /
cdef->enable_bits_per_led_control_register;
int i;
for (i = 0; i < num_regs; i++) {
ret = is31fl32xx_write(priv,
cdef->led_control_register_base+i,
value);
if (ret)
return ret;
}
}
ret = is31fl32xx_software_shutdown(priv, false);
if (ret)
return ret;
if (cdef->global_control_reg != IS31FL32XX_REG_NONE) {
ret = is31fl32xx_write(priv, cdef->global_control_reg, 0x00);
if (ret)
return ret;
}
return 0;
}
static int is31fl32xx_parse_child_dt(const struct device *dev,
const struct device_node *child,
struct is31fl32xx_led_data *led_data)
{
struct led_classdev *cdev = &led_data->cdev;
int ret = 0;
u32 reg;
ret = of_property_read_u32(child, "reg", &reg);
if (ret || reg < 1 || reg > led_data->priv->cdef->channels) {
dev_err(dev,
"Child node %pOF does not have a valid reg property\n",
child);
return -EINVAL;
}
led_data->channel = reg;
cdev->brightness_set_blocking = is31fl32xx_brightness_set;
return 0;
}
static struct is31fl32xx_led_data *is31fl32xx_find_led_data(
struct is31fl32xx_priv *priv,
u8 channel)
{
size_t i;
for (i = 0; i < priv->num_leds; i++) {
if (priv->leds[i].channel == channel)
return &priv->leds[i];
}
return NULL;
}
static int is31fl32xx_parse_dt(struct device *dev,
struct is31fl32xx_priv *priv)
{
struct device_node *child;
int ret = 0;
for_each_available_child_of_node(dev_of_node(dev), child) {
struct led_init_data init_data = {};
struct is31fl32xx_led_data *led_data =
&priv->leds[priv->num_leds];
const struct is31fl32xx_led_data *other_led_data;
led_data->priv = priv;
ret = is31fl32xx_parse_child_dt(dev, child, led_data);
if (ret)
goto err;
/* Detect if channel is already in use by another child */
other_led_data = is31fl32xx_find_led_data(priv,
led_data->channel);
if (other_led_data) {
dev_err(dev,
"Node %pOF 'reg' conflicts with another LED\n",
child);
ret = -EINVAL;
goto err;
}
init_data.fwnode = of_fwnode_handle(child);
ret = devm_led_classdev_register_ext(dev, &led_data->cdev,
&init_data);
if (ret) {
dev_err(dev, "Failed to register LED for %pOF: %d\n",
child, ret);
goto err;
}
priv->num_leds++;
}
return 0;
err:
of_node_put(child);
return ret;
}
static const struct of_device_id of_is31fl32xx_match[] = {
{ .compatible = "issi,is31fl3236", .data = &is31fl3236_cdef, },
{ .compatible = "issi,is31fl3235", .data = &is31fl3235_cdef, },
{ .compatible = "issi,is31fl3218", .data = &is31fl3218_cdef, },
{ .compatible = "si-en,sn3218", .data = &is31fl3218_cdef, },
{ .compatible = "issi,is31fl3216", .data = &is31fl3216_cdef, },
{ .compatible = "si-en,sn3216", .data = &is31fl3216_cdef, },
{},
};
MODULE_DEVICE_TABLE(of, of_is31fl32xx_match);
static int is31fl32xx_probe(struct i2c_client *client)
{
const struct is31fl32xx_chipdef *cdef;
struct device *dev = &client->dev;
struct is31fl32xx_priv *priv;
int count;
int ret = 0;
cdef = device_get_match_data(dev);
count = of_get_available_child_count(dev_of_node(dev));
if (!count)
return -EINVAL;
priv = devm_kzalloc(dev, struct_size(priv, leds, count),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client = client;
priv->cdef = cdef;
i2c_set_clientdata(client, priv);
ret = is31fl32xx_init_regs(priv);
if (ret)
return ret;
ret = is31fl32xx_parse_dt(dev, priv);
if (ret)
return ret;
return 0;
}
static void is31fl32xx_remove(struct i2c_client *client)
{
struct is31fl32xx_priv *priv = i2c_get_clientdata(client);
int ret;
ret = is31fl32xx_reset_regs(priv);
if (ret)
dev_err(&client->dev, "Failed to reset registers on removal (%pe)\n",
ERR_PTR(ret));
}
/*
* i2c-core (and modalias) requires that id_table be properly filled,
* even though it is not used for DeviceTree based instantiation.
*/
static const struct i2c_device_id is31fl32xx_id[] = {
{ "is31fl3236" },
{ "is31fl3235" },
{ "is31fl3218" },
{ "sn3218" },
{ "is31fl3216" },
{ "sn3216" },
{},
};
MODULE_DEVICE_TABLE(i2c, is31fl32xx_id);
static struct i2c_driver is31fl32xx_driver = {
.driver = {
.name = "is31fl32xx",
.of_match_table = of_is31fl32xx_match,
},
.probe = is31fl32xx_probe,
.remove = is31fl32xx_remove,
.id_table = is31fl32xx_id,
};
module_i2c_driver(is31fl32xx_driver);
MODULE_AUTHOR("David Rivshin <drivshin@allworx.com>");
MODULE_DESCRIPTION("ISSI IS31FL32xx LED driver");
MODULE_LICENSE("GPL v2");
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