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Message-Id: <20220427185457.27839-2-eajames@linux.ibm.com>
Date: Wed, 27 Apr 2022 13:54:54 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: pavel@....cz
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
andy.shevchenko@...il.com, eajames@...ux.ibm.com,
dan.carpenter@...cle.com
Subject: [PATCH v5 1/4] leds: pca955x: Refactor with helper functions and renaming
Add helper functions to clean up the code, and rename a few
oddly named functions and variables.
Signed-off-by: Eddie James <eajames@...ux.ibm.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
drivers/leds/leds-pca955x.c | 50 ++++++++++++++++++-------------------
1 file changed, 24 insertions(+), 26 deletions(-)
diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index 81aaf21212d7..a683c872e1ff 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -134,19 +134,21 @@ struct pca955x_led {
struct fwnode_handle *fwnode;
};
+#define led_to_pca955x(l) container_of(l, struct pca955x_led, led_cdev)
+
struct pca955x_platform_data {
struct pca955x_led *leds;
int num_leds;
};
/* 8 bits per input register */
-static inline int pca95xx_num_input_regs(int bits)
+static inline int pca955x_num_input_regs(int bits)
{
return (bits + 7) / 8;
}
/* 4 bits per LED selector register */
-static inline int pca95xx_num_led_regs(int bits)
+static inline int pca955x_num_led_regs(int bits)
{
return (bits + 3) / 4;
}
@@ -161,6 +163,11 @@ static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
((state & 0x3) << (led_num << 1));
}
+static inline int pca955x_ledstate(u8 ls, int led_num)
+{
+ return (ls >> (led_num << 1)) & 0x3;
+}
+
/*
* Write to frequency prescaler register, used to program the
* period of the PWM output. period = (PSCx + 1) / 38
@@ -168,7 +175,7 @@ static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
{
struct pca955x *pca955x = i2c_get_clientdata(client);
- u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
+ u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n);
int ret;
ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -188,7 +195,7 @@ static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
{
struct pca955x *pca955x = i2c_get_clientdata(client);
- u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+ u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
int ret;
ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -205,7 +212,7 @@ static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
{
struct pca955x *pca955x = i2c_get_clientdata(client);
- u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+ u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
int ret;
ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -222,7 +229,7 @@ static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
{
struct pca955x *pca955x = i2c_get_clientdata(client);
- u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+ u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
int ret;
ret = i2c_smbus_read_byte_data(client, cmd);
@@ -238,7 +245,7 @@ static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
{
struct pca955x *pca955x = i2c_get_clientdata(client);
- u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+ u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
int ret;
ret = i2c_smbus_read_byte_data(client, cmd);
@@ -253,9 +260,7 @@ static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
{
- struct pca955x_led *pca955x_led = container_of(led_cdev,
- struct pca955x_led,
- led_cdev);
+ struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
struct pca955x *pca955x = pca955x_led->pca955x;
u8 ls, pwm;
int ret;
@@ -264,8 +269,7 @@ static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
if (ret)
return ret;
- ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
- switch (ls) {
+ switch (pca955x_ledstate(ls, pca955x_led->led_num % 4)) {
case PCA955X_LS_LED_ON:
ret = LED_FULL;
break;
@@ -289,19 +293,13 @@ static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
static int pca955x_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
- struct pca955x_led *pca955x_led;
- struct pca955x *pca955x;
+ struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
+ struct pca955x *pca955x = pca955x_led->pca955x;
+ int reg = pca955x_led->led_num / 4;
+ int bit = pca955x_led->led_num % 4;
u8 ls;
- int chip_ls; /* which LSx to use (0-3 potentially) */
- int ls_led; /* which set of bits within LSx to use (0-3) */
int ret;
- pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
- pca955x = pca955x_led->pca955x;
-
- chip_ls = pca955x_led->led_num / 4;
- ls_led = pca955x_led->led_num % 4;
-
mutex_lock(&pca955x->lock);
ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
@@ -310,13 +308,13 @@ static int pca955x_led_set(struct led_classdev *led_cdev,
switch (value) {
case LED_FULL:
- ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
+ ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_ON);
break;
case LED_OFF:
- ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
+ ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF);
break;
case LED_HALF:
- ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
+ ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK0);
break;
default:
/*
@@ -329,7 +327,7 @@ static int pca955x_led_set(struct led_classdev *led_cdev,
ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
if (ret)
goto out;
- ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
+ ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK1);
break;
}
--
2.27.0
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