505 строки
13 KiB
C
505 строки
13 KiB
C
// 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[];
|
|
};
|
|
|
|
/**
|
|
* 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, 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;
|
|
|
|
if (of_property_read_string(child, "label", &cdev->name))
|
|
cdev->name = child->name;
|
|
|
|
ret = of_property_read_u32(child, "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;
|
|
|
|
of_property_read_string(child, "linux,default-trigger",
|
|
&cdev->default_trigger);
|
|
|
|
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_child_of_node(dev->of_node, child) {
|
|
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,
|
|
"%s and %s both attempting to use channel %d\n",
|
|
led_data->cdev.name,
|
|
other_led_data->cdev.name,
|
|
led_data->channel);
|
|
goto err;
|
|
}
|
|
|
|
ret = devm_led_classdev_register(dev, &led_data->cdev);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register PWM led for %s: %d\n",
|
|
led_data->cdev.name, 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 i2c_device_id *id)
|
|
{
|
|
const struct is31fl32xx_chipdef *cdef;
|
|
const struct of_device_id *of_dev_id;
|
|
struct device *dev = &client->dev;
|
|
struct is31fl32xx_priv *priv;
|
|
int count;
|
|
int ret = 0;
|
|
|
|
of_dev_id = of_match_device(of_is31fl32xx_match, dev);
|
|
if (!of_dev_id)
|
|
return -EINVAL;
|
|
|
|
cdef = of_dev_id->data;
|
|
|
|
count = of_get_child_count(dev->of_node);
|
|
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 int is31fl32xx_remove(struct i2c_client *client)
|
|
{
|
|
struct is31fl32xx_priv *priv = i2c_get_clientdata(client);
|
|
|
|
return is31fl32xx_reset_regs(priv);
|
|
}
|
|
|
|
/*
|
|
* 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");
|