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leds: leds-pca995x: Add support for NXP PCA9956B

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[ Upstream commit 68d6520d2e ]

Add support for PCA9956B chip, which belongs to the same family.

This chip features 24 instead of 16 outputs, so add a chipdef struct to
deal with the different register layouts.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Pieterjan Camerlynck <pieterjanca@gmail.com>
Link: https://lore.kernel.org/r/20240711-pca995x-v4-2-702a67148065@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
Stable-dep-of: 82c5ada1f9 ("leds: pca995x: Fix device child node usage in pca995x_probe()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pieterjan Camerlynck 2024-07-11 14:49:51 +02:00 committed by Greg Kroah-Hartman
parent 583314ebaa
commit dbba3fce3e
1 changed files with 39 additions and 20 deletions
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59
drivers/leds/leds-pca995x.c
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@ -19,10 +19,6 @@
#define PCA995X_MODE1 0x00
#define PCA995X_MODE2 0x01
#define PCA995X_LEDOUT0 0x02
#define PCA9955B_PWM0 0x08
#define PCA9952_PWM0 0x0A
#define PCA9952_IREFALL 0x43
#define PCA9955B_IREFALL 0x45
/* Auto-increment disabled. Normal mode */
#define PCA995X_MODE1_CFG 0x00
@ -34,17 +30,38 @@
#define PCA995X_LDRX_MASK 0x3
#define PCA995X_LDRX_BITS 2
#define PCA995X_MAX_OUTPUTS 16
#define PCA995X_MAX_OUTPUTS 24
#define PCA995X_OUTPUTS_PER_REG 4
#define PCA995X_IREFALL_FULL_CFG 0xFF
#define PCA995X_IREFALL_HALF_CFG (PCA995X_IREFALL_FULL_CFG / 2)
#define PCA995X_TYPE_NON_B 0
#define PCA995X_TYPE_B 1
#define ldev_to_led(c) container_of(c, struct pca995x_led, ldev)
struct pca995x_chipdef {
unsigned int num_leds;
u8 pwm_base;
u8 irefall;
};
static const struct pca995x_chipdef pca9952_chipdef = {
.num_leds = 16,
.pwm_base = 0x0a,
.irefall = 0x43,
};
static const struct pca995x_chipdef pca9955b_chipdef = {
.num_leds = 16,
.pwm_base = 0x08,
.irefall = 0x45,
};
static const struct pca995x_chipdef pca9956b_chipdef = {
.num_leds = 24,
.pwm_base = 0x0a,
.irefall = 0x40,
};
struct pca995x_led {
unsigned int led_no;
struct led_classdev ldev;
@ -54,7 +71,7 @@ struct pca995x_led {
struct pca995x_chip {
struct regmap *regmap;
struct pca995x_led leds[PCA995X_MAX_OUTPUTS];
int btype;
const struct pca995x_chipdef *chipdef;
};
static int pca995x_brightness_set(struct led_classdev *led_cdev,
@ -62,10 +79,11 @@ static int pca995x_brightness_set(struct led_classdev *led_cdev,
{
struct pca995x_led *led = ldev_to_led(led_cdev);
struct pca995x_chip *chip = led->chip;
const struct pca995x_chipdef *chipdef = chip->chipdef;
u8 ledout_addr, pwmout_addr;
int shift, ret;
pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no;
pwmout_addr = chipdef->pwm_base + led->led_no;
ledout_addr = PCA995X_LEDOUT0 + (led->led_no / PCA995X_OUTPUTS_PER_REG);
shift = PCA995X_LDRX_BITS * (led->led_no % PCA995X_OUTPUTS_PER_REG);
@ -104,11 +122,12 @@ static int pca995x_probe(struct i2c_client *client)
struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 };
struct fwnode_handle *np, *child;
struct device *dev = &client->dev;
const struct pca995x_chipdef *chipdef;
struct pca995x_chip *chip;
struct pca995x_led *led;
int i, btype, reg, ret;
int i, reg, ret;
btype = (unsigned long)device_get_match_data(&client->dev);
chipdef = device_get_match_data(&client->dev);
np = dev_fwnode(dev);
if (!np)
@ -118,7 +137,7 @@ static int pca995x_probe(struct i2c_client *client)
if (!chip)
return -ENOMEM;
chip->btype = btype;
chip->chipdef = chipdef;
chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap);
if (IS_ERR(chip->regmap))
return PTR_ERR(chip->regmap);
@ -170,21 +189,21 @@ static int pca995x_probe(struct i2c_client *client)
return ret;
/* IREF Output current value for all LEDn outputs */
return regmap_write(chip->regmap,
btype ? PCA9955B_IREFALL : PCA9952_IREFALL,
PCA995X_IREFALL_HALF_CFG);
return regmap_write(chip->regmap, chipdef->irefall, PCA995X_IREFALL_HALF_CFG);
}
static const struct i2c_device_id pca995x_id[] = {
{ "pca9952", .driver_data = (kernel_ulong_t)PCA995X_TYPE_NON_B },
{ "pca9955b", .driver_data = (kernel_ulong_t)PCA995X_TYPE_B },
{ "pca9952", .driver_data = (kernel_ulong_t)&pca9952_chipdef },
{ "pca9955b", .driver_data = (kernel_ulong_t)&pca9955b_chipdef },
{ "pca9956b", .driver_data = (kernel_ulong_t)&pca9956b_chipdef },
{}
};
MODULE_DEVICE_TABLE(i2c, pca995x_id);
static const struct of_device_id pca995x_of_match[] = {
{ .compatible = "nxp,pca9952", .data = (void *)PCA995X_TYPE_NON_B },
{ .compatible = "nxp,pca9955b", .data = (void *)PCA995X_TYPE_B },
{ .compatible = "nxp,pca9952", .data = &pca9952_chipdef },
{ .compatible = "nxp,pca9955b", . data = &pca9955b_chipdef },
{ .compatible = "nxp,pca9956b", .data = &pca9956b_chipdef },
{},
};
MODULE_DEVICE_TABLE(of, pca995x_of_match);