diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-07 14:33:13 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-07 14:33:13 -0700 |
commit | 5f9cc57036165bbd96f3a432fd2569c812503a92 (patch) | |
tree | 950466c2a3fa8d1723d51d766549f7cbb9897f1e | |
parent | cd7b34fe1c2d93c54b368c295de88612c0b7120b (diff) | |
parent | 1591caf2d5eafdfb3b300691f8f99e5bb97d5406 (diff) | |
download | op-kernel-dev-5f9cc57036165bbd96f3a432fd2569c812503a92.zip op-kernel-dev-5f9cc57036165bbd96f3a432fd2569c812503a92.tar.gz |
Merge tag 'leds_for_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds
Pull LED updates from Jacek Anaszewski:
"LED class drivers improvements:
leds-pca955x:
- add Device Tree support and bindings
- use devm_led_classdev_register()
- add GPIO support
- prevent crippled LED class device name
- check for I2C errors
leds-gpio:
- add optional retain-state-shutdown DT property
- allow LED to retain state at shutdown
leds-tlc591xx:
- merge conditional tests
- add missing of_node_put
leds-powernv:
- delete an error message for a failed memory allocation in
powernv_led_create()
leds-is31fl32xx.c
- convert to using custom %pOF printf format specifier
Constify attribute_group structures in:
- leds-blinkm
- leds-lm3533
Make several arrays static const in:
- leds-aat1290
- leds-lp5521
- leds-lp5562
- leds-lp8501"
* tag 'leds_for_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
leds: pca955x: check for I2C errors
leds: gpio: Allow LED to retain state at shutdown
dt-bindings: leds: gpio: Add optional retain-state-shutdown property
leds: powernv: Delete an error message for a failed memory allocation in powernv_led_create()
leds: lp8501: make several arrays static const
leds: lp5562: make several arrays static const
leds: lp5521: make several arrays static const
leds: aat1290: make array max_mm_current_percent static const
leds: pca955x: Prevent crippled LED device name
leds: lm3533: constify attribute_group structure
dt-bindings: leds: add pca955x
leds: pca955x: add GPIO support
leds: pca955x: use devm_led_classdev_register
leds: pca955x: add device tree support
leds: Convert to using %pOF instead of full_name
leds: blinkm: constify attribute_group structures.
leds: tlc591xx: add missing of_node_put
leds: tlc591xx: merge conditional tests
-rw-r--r-- | Documentation/devicetree/bindings/leds/leds-gpio.txt | 3 | ||||
-rw-r--r-- | Documentation/devicetree/bindings/leds/leds-pca955x.txt | 88 | ||||
-rw-r--r-- | drivers/leds/Kconfig | 11 | ||||
-rw-r--r-- | drivers/leds/leds-aat1290.c | 6 | ||||
-rw-r--r-- | drivers/leds/leds-blinkm.c | 2 | ||||
-rw-r--r-- | drivers/leds/leds-gpio.c | 7 | ||||
-rw-r--r-- | drivers/leds/leds-is31fl32xx.c | 4 | ||||
-rw-r--r-- | drivers/leds/leds-lm3533.c | 2 | ||||
-rw-r--r-- | drivers/leds/leds-lp5521.c | 8 | ||||
-rw-r--r-- | drivers/leds/leds-lp5562.c | 10 | ||||
-rw-r--r-- | drivers/leds/leds-lp8501.c | 6 | ||||
-rw-r--r-- | drivers/leds/leds-pca955x.c | 350 | ||||
-rw-r--r-- | drivers/leds/leds-powernv.c | 6 | ||||
-rw-r--r-- | drivers/leds/leds-tlc591xx.c | 11 | ||||
-rw-r--r-- | include/dt-bindings/leds/leds-pca955x.h | 16 | ||||
-rw-r--r-- | include/linux/leds.h | 2 |
16 files changed, 438 insertions, 94 deletions
diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt index 76535ca..a48dda2 100644 --- a/Documentation/devicetree/bindings/leds/leds-gpio.txt +++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt @@ -18,6 +18,9 @@ LED sub-node properties: see Documentation/devicetree/bindings/leds/common.txt - retain-state-suspended: (optional) The suspend state can be retained.Such as charge-led gpio. +- retain-state-shutdown: (optional) Retain the state of the LED on shutdown. + Useful in BMC systems, for example when the BMC is rebooted while the host + remains up. - panic-indicator : (optional) see Documentation/devicetree/bindings/leds/common.txt diff --git a/Documentation/devicetree/bindings/leds/leds-pca955x.txt b/Documentation/devicetree/bindings/leds/leds-pca955x.txt new file mode 100644 index 0000000..7984efb --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-pca955x.txt @@ -0,0 +1,88 @@ +* NXP - pca955x LED driver + +The PCA955x family of chips are I2C LED blinkers whose pins not used +to control LEDs can be used as general purpose I/Os. The GPIO pins can +be input or output, and output pins can also be pulse-width controlled. + +Required properties: +- compatible : should be one of : + "nxp,pca9550" + "nxp,pca9551" + "nxp,pca9552" + "nxp,pca9553" +- #address-cells: must be 1 +- #size-cells: must be 0 +- reg: I2C slave address. depends on the model. + +Optional properties: +- gpio-controller: allows pins to be used as GPIOs. +- #gpio-cells: must be 2. +- gpio-line-names: define the names of the GPIO lines + +LED sub-node properties: +- reg : number of LED line. + from 0 to 1 for the pca9550 + from 0 to 7 for the pca9551 + from 0 to 15 for the pca9552 + from 0 to 3 for the pca9553 +- type: (optional) either + PCA9532_TYPE_NONE + PCA9532_TYPE_LED + PCA9532_TYPE_GPIO + see dt-bindings/leds/leds-pca955x.h (default to LED) +- label : (optional) + see Documentation/devicetree/bindings/leds/common.txt +- linux,default-trigger : (optional) + see Documentation/devicetree/bindings/leds/common.txt + +Examples: + +pca9552: pca9552@60 { + compatible = "nxp,pca9552"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0x60>; + + gpio-controller; + #gpio-cells = <2>; + gpio-line-names = "GPIO12", "GPIO13", "GPIO14", "GPIO15"; + + gpio@12 { + reg = <12>; + type = <PCA955X_TYPE_GPIO>; + }; + gpio@13 { + reg = <13>; + type = <PCA955X_TYPE_GPIO>; + }; + gpio@14 { + reg = <14>; + type = <PCA955X_TYPE_GPIO>; + }; + gpio@15 { + reg = <15>; + type = <PCA955X_TYPE_GPIO>; + }; + + led@0 { + label = "red:power"; + linux,default-trigger = "default-on"; + reg = <0>; + type = <PCA955X_TYPE_LED>; + }; + led@1 { + label = "green:power"; + reg = <1>; + type = <PCA955X_TYPE_LED>; + }; + led@2 { + label = "pca9552:yellow"; + reg = <2>; + type = <PCA955X_TYPE_LED>; + }; + led@3 { + label = "pca9552:white"; + reg = <3>; + type = <PCA955X_TYPE_LED>; + }; +}; diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 27dc800..52ea34e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -386,6 +386,17 @@ config LEDS_PCA955X LED driver chips accessed via the I2C bus. Supported devices include PCA9550, PCA9551, PCA9552, and PCA9553. +config LEDS_PCA955X_GPIO + bool "Enable GPIO support for PCA955X" + depends on LEDS_PCA955X + depends on GPIOLIB + help + Allow unused pins on PCA955X to be used as gpio. + + To use a pin as gpio the pin type should be set to + PCA955X_TYPE_GPIO in the device tree. + + config LEDS_PCA963X tristate "LED support for PCA963x I2C chip" depends on LEDS_CLASS diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c index 424898e..43bd8a4 100644 --- a/drivers/leds/leds-aat1290.c +++ b/drivers/leds/leds-aat1290.c @@ -314,8 +314,10 @@ static void aat1290_led_validate_mm_current(struct aat1290_led *led, static int init_mm_current_scale(struct aat1290_led *led, struct aat1290_led_config_data *cfg) { - int max_mm_current_percent[] = { 20, 22, 25, 28, 32, 36, 40, 45, 50, 56, - 63, 71, 79, 89, 100 }; + static const int max_mm_current_percent[] = { + 20, 22, 25, 28, 32, 36, 40, 45, 50, 56, + 63, 71, 79, 89, 100 + }; int i, max_mm_current = AAT1290_MAX_MM_CURRENT(cfg->max_flash_current); diff --git a/drivers/leds/leds-blinkm.c b/drivers/leds/leds-blinkm.c index 617fe97..d03ed6b 100644 --- a/drivers/leds/leds-blinkm.c +++ b/drivers/leds/leds-blinkm.c @@ -298,7 +298,7 @@ static struct attribute *blinkm_attrs[] = { NULL, }; -static struct attribute_group blinkm_group = { +static const struct attribute_group blinkm_group = { .name = "blinkm", .attrs = blinkm_attrs, }; diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index e753ba9..764c313 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -134,6 +134,8 @@ static int create_gpio_led(const struct gpio_led *template, led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; if (template->panic_indicator) led_dat->cdev.flags |= LED_PANIC_INDICATOR; + if (template->retain_state_shutdown) + led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN; ret = gpiod_direction_output(led_dat->gpiod, state); if (ret < 0) @@ -205,6 +207,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) if (fwnode_property_present(child, "retain-state-suspended")) led.retain_state_suspended = 1; + if (fwnode_property_present(child, "retain-state-shutdown")) + led.retain_state_shutdown = 1; if (fwnode_property_present(child, "panic-indicator")) led.panic_indicator = 1; @@ -267,7 +271,8 @@ static void gpio_led_shutdown(struct platform_device *pdev) for (i = 0; i < priv->num_leds; i++) { struct gpio_led_data *led = &priv->leds[i]; - gpio_led_set(&led->cdev, LED_OFF); + if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN)) + gpio_led_set(&led->cdev, LED_OFF); } } diff --git a/drivers/leds/leds-is31fl32xx.c b/drivers/leds/leds-is31fl32xx.c index 478844c..31a9d74 100644 --- a/drivers/leds/leds-is31fl32xx.c +++ b/drivers/leds/leds-is31fl32xx.c @@ -348,8 +348,8 @@ static int is31fl32xx_parse_child_dt(const struct device *dev, ret = of_property_read_u32(child, "reg", ®); if (ret || reg < 1 || reg > led_data->priv->cdef->channels) { dev_err(dev, - "Child node %s does not have a valid reg property\n", - child->full_name); + "Child node %pOF does not have a valid reg property\n", + child); return -EINVAL; } led_data->channel = reg; diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c index 5b529dc..72224b5 100644 --- a/drivers/leds/leds-lm3533.c +++ b/drivers/leds/leds-lm3533.c @@ -626,7 +626,7 @@ static umode_t lm3533_led_attr_is_visible(struct kobject *kobj, return mode; }; -static struct attribute_group lm3533_led_attribute_group = { +static const struct attribute_group lm3533_led_attribute_group = { .is_visible = lm3533_led_attr_is_visible, .attrs = lm3533_led_attributes }; diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c index f53c8cd..55c0517 100644 --- a/drivers/leds/leds-lp5521.c +++ b/drivers/leds/leds-lp5521.c @@ -134,13 +134,13 @@ static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current) static void lp5521_load_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; - u8 mask[] = { + static const u8 mask[] = { [LP55XX_ENGINE_1] = LP5521_MODE_R_M, [LP55XX_ENGINE_2] = LP5521_MODE_G_M, [LP55XX_ENGINE_3] = LP5521_MODE_B_M, }; - u8 val[] = { + static const u8 val[] = { [LP55XX_ENGINE_1] = LP5521_LOAD_R, [LP55XX_ENGINE_2] = LP5521_LOAD_G, [LP55XX_ENGINE_3] = LP5521_LOAD_B, @@ -160,7 +160,7 @@ static void lp5521_stop_all_engines(struct lp55xx_chip *chip) static void lp5521_stop_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; - u8 mask[] = { + static const u8 mask[] = { [LP55XX_ENGINE_1] = LP5521_MODE_R_M, [LP55XX_ENGINE_2] = LP5521_MODE_G_M, [LP55XX_ENGINE_3] = LP5521_MODE_B_M, @@ -226,7 +226,7 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip, { enum lp55xx_engine_index idx = chip->engine_idx; u8 pattern[LP5521_PROGRAM_LENGTH] = {0}; - u8 addr[] = { + static const u8 addr[] = { [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM, [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM, [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM, diff --git a/drivers/leds/leds-lp5562.c b/drivers/leds/leds-lp5562.c index 9089258..05ffa34 100644 --- a/drivers/leds/leds-lp5562.c +++ b/drivers/leds/leds-lp5562.c @@ -116,7 +116,7 @@ static inline void lp5562_wait_enable_done(void) static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current) { - u8 addr[] = { + static const u8 addr[] = { LP5562_REG_R_CURRENT, LP5562_REG_G_CURRENT, LP5562_REG_B_CURRENT, @@ -130,13 +130,13 @@ static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current) static void lp5562_load_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; - u8 mask[] = { + static const u8 mask[] = { [LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M, [LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M, [LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M, }; - u8 val[] = { + static const u8 val[] = { [LP55XX_ENGINE_1] = LP5562_LOAD_ENG1, [LP55XX_ENGINE_2] = LP5562_LOAD_ENG2, [LP55XX_ENGINE_3] = LP5562_LOAD_ENG3, @@ -211,7 +211,7 @@ static int lp5562_update_firmware(struct lp55xx_chip *chip, { enum lp55xx_engine_index idx = chip->engine_idx; u8 pattern[LP5562_PROGRAM_LENGTH] = {0}; - u8 addr[] = { + static const u8 addr[] = { [LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1, [LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2, [LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3, @@ -314,7 +314,7 @@ static int lp5562_post_init_device(struct lp55xx_chip *chip) static int lp5562_led_brightness(struct lp55xx_led *led) { struct lp55xx_chip *chip = led->chip; - u8 addr[] = { + static const u8 addr[] = { LP5562_REG_R_PWM, LP5562_REG_G_PWM, LP5562_REG_B_PWM, diff --git a/drivers/leds/leds-lp8501.c b/drivers/leds/leds-lp8501.c index 3f9675b..3adb113 100644 --- a/drivers/leds/leds-lp8501.c +++ b/drivers/leds/leds-lp8501.c @@ -118,19 +118,19 @@ static int lp8501_post_init_device(struct lp55xx_chip *chip) static void lp8501_load_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; - u8 mask[] = { + static const u8 mask[] = { [LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M, [LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M, [LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M, }; - u8 val[] = { + static const u8 val[] = { [LP55XX_ENGINE_1] = LP8501_LOAD_ENG1, [LP55XX_ENGINE_2] = LP8501_LOAD_ENG2, [LP55XX_ENGINE_3] = LP8501_LOAD_ENG3, }; - u8 page_sel[] = { + static const u8 page_sel[] = { [LP55XX_ENGINE_1] = LP8501_PAGE_ENG1, [LP55XX_ENGINE_2] = LP8501_PAGE_ENG2, [LP55XX_ENGINE_3] = LP8501_PAGE_ENG3, diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index 9a87311..9057291 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -41,14 +41,19 @@ */ #include <linux/acpi.h> -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/string.h> #include <linux/ctype.h> -#include <linux/leds.h> +#include <linux/delay.h> #include <linux/err.h> +#include <linux/gpio.h> #include <linux/i2c.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/of.h> #include <linux/slab.h> +#include <linux/string.h> + +#include <dt-bindings/leds/leds-pca955x.h> /* LED select registers determine the source that drives LED outputs */ #define PCA955X_LS_LED_ON 0x0 /* Output LOW */ @@ -115,6 +120,9 @@ struct pca955x { struct pca955x_led *leds; struct pca955x_chipdef *chipdef; struct i2c_client *client; +#ifdef CONFIG_LEDS_PCA955X_GPIO + struct gpio_chip gpio; +#endif }; struct pca955x_led { @@ -122,6 +130,13 @@ struct pca955x_led { struct led_classdev led_cdev; int led_num; /* 0 .. 15 potentially */ char name[32]; + u32 type; + const char *default_trigger; +}; + +struct pca955x_platform_data { + struct pca955x_led *leds; + int num_leds; }; /* 8 bits per input register */ @@ -150,13 +165,18 @@ static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) * Write to frequency prescaler register, used to program the * period of the PWM output. period = (PSCx + 1) / 38 */ -static void pca955x_write_psc(struct i2c_client *client, int n, u8 val) +static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) { struct pca955x *pca955x = i2c_get_clientdata(client); + int ret; - i2c_smbus_write_byte_data(client, + ret = i2c_smbus_write_byte_data(client, pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n, val); + if (ret < 0) + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", + __func__, n, val, ret); + return ret; } /* @@ -166,38 +186,56 @@ static void pca955x_write_psc(struct i2c_client *client, int n, u8 val) * * Duty cycle is (256 - PWMx) / 256 */ -static void pca955x_write_pwm(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); + int ret; - i2c_smbus_write_byte_data(client, + ret = i2c_smbus_write_byte_data(client, pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n, val); + if (ret < 0) + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", + __func__, n, val, ret); + return ret; } /* * Write to LED selector register, which determines the source that * drives the LED output. */ -static void pca955x_write_ls(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); + int ret; - i2c_smbus_write_byte_data(client, + ret = i2c_smbus_write_byte_data(client, pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n, val); + if (ret < 0) + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", + __func__, n, val, ret); + return ret; } /* * Read the LED selector register, which determines the source that * drives the LED output. */ -static u8 pca955x_read_ls(struct i2c_client *client, int n) +static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) { struct pca955x *pca955x = i2c_get_clientdata(client); + int ret; - return (u8) i2c_smbus_read_byte_data(client, + ret = i2c_smbus_read_byte_data(client, pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n); + if (ret < 0) { + dev_err(&client->dev, "%s: reg 0x%x, err %d\n", + __func__, n, ret); + return ret; + } + *val = (u8)ret; + return 0; } static int pca955x_led_set(struct led_classdev *led_cdev, @@ -208,6 +246,7 @@ static int pca955x_led_set(struct led_classdev *led_cdev, 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; @@ -217,7 +256,9 @@ static int pca955x_led_set(struct led_classdev *led_cdev, mutex_lock(&pca955x->lock); - ls = pca955x_read_ls(pca955x->client, chip_ls); + ret = pca955x_read_ls(pca955x->client, chip_ls, &ls); + if (ret) + goto out; switch (value) { case LED_FULL: @@ -237,18 +278,159 @@ static int pca955x_led_set(struct led_classdev *led_cdev, * OFF, HALF, or FULL. But, this is probably better than * just turning off for all other values. */ - pca955x_write_pwm(pca955x->client, 1, - 255 - value); + ret = pca955x_write_pwm(pca955x->client, 1, 255 - value); + if (ret) + goto out; ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1); break; } - pca955x_write_ls(pca955x->client, chip_ls, ls); + ret = pca955x_write_ls(pca955x->client, chip_ls, ls); +out: mutex_unlock(&pca955x->lock); + return ret; +} + +#ifdef CONFIG_LEDS_PCA955X_GPIO +/* + * Read the INPUT register, which contains the state of LEDs. + */ +static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) +{ + int ret = i2c_smbus_read_byte_data(client, n); + + if (ret < 0) { + dev_err(&client->dev, "%s: reg 0x%x, err %d\n", + __func__, n, ret); + return ret; + } + *val = (u8)ret; return 0; + +} + +static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) +{ + struct pca955x *pca955x = gpiochip_get_data(gc); + struct pca955x_led *led = &pca955x->leds[offset]; + + if (led->type == PCA955X_TYPE_GPIO) + return 0; + + return -EBUSY; +} + +static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, + int val) +{ + struct pca955x *pca955x = gpiochip_get_data(gc); + struct pca955x_led *led = &pca955x->leds[offset]; + + if (val) + return pca955x_led_set(&led->led_cdev, LED_FULL); + else + return pca955x_led_set(&led->led_cdev, LED_OFF); +} + +static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, + int val) +{ + pca955x_set_value(gc, offset, val); +} + +static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) +{ + struct pca955x *pca955x = gpiochip_get_data(gc); + struct pca955x_led *led = &pca955x->leds[offset]; + u8 reg = 0; + + /* There is nothing we can do about errors */ + pca955x_read_input(pca955x->client, led->led_num / 8, ®); + + return !!(reg & (1 << (led->led_num % 8))); +} + +static int pca955x_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + /* To use as input ensure pin is not driven */ + return pca955x_set_value(gc, offset, 0); +} + +static int pca955x_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int val) +{ + return pca955x_set_value(gc, offset, val); } +#endif /* CONFIG_LEDS_PCA955X_GPIO */ + +#if IS_ENABLED(CONFIG_OF) +static struct pca955x_platform_data * +pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip) +{ + struct device_node *np = client->dev.of_node; + struct device_node *child; + struct pca955x_platform_data *pdata; + int count; + + count = of_get_child_count(np); + if (!count || count > chip->bits) + return ERR_PTR(-ENODEV); + + pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->leds = devm_kzalloc(&client->dev, + sizeof(struct pca955x_led) * chip->bits, + GFP_KERNEL); + if (!pdata->leds) + return ERR_PTR(-ENOMEM); + + for_each_child_of_node(np, child) { + const char *name; + u32 reg; + int res; + + res = of_property_read_u32(child, "reg", ®); + if ((res != 0) || (reg >= chip->bits)) + continue; + + if (of_property_read_string(child, "label", &name)) + name = child->name; + + snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name), + "%s", name); + + pdata->leds[reg].type = PCA955X_TYPE_LED; + of_property_read_u32(child, "type", &pdata->leds[reg].type); + of_property_read_string(child, "linux,default-trigger", + &pdata->leds[reg].default_trigger); + } + + pdata->num_leds = chip->bits; + + return pdata; +} + +static const struct of_device_id of_pca955x_match[] = { + { .compatible = "nxp,pca9550", .data = (void *)pca9550 }, + { .compatible = "nxp,pca9551", .data = (void *)pca9551 }, + { .compatible = "nxp,pca9552", .data = (void *)pca9552 }, + { .compatible = "nxp,pca9553", .data = (void *)pca9553 }, + {}, +}; + +MODULE_DEVICE_TABLE(of, of_pca955x_match); +#else +static struct pca955x_platform_data * +pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip) +{ + return ERR_PTR(-ENODEV); +} +#endif static int pca955x_probe(struct i2c_client *client, const struct i2c_device_id *id) @@ -257,8 +439,9 @@ static int pca955x_probe(struct i2c_client *client, struct pca955x_led *pca955x_led; struct pca955x_chipdef *chip; struct i2c_adapter *adapter; - struct led_platform_data *pdata; int i, err; + struct pca955x_platform_data *pdata; + int ngpios = 0; if (id) { chip = &pca955x_chipdefs[id->driver_data]; @@ -272,6 +455,11 @@ static int pca955x_probe(struct i2c_client *client, } adapter = to_i2c_adapter(client->dev.parent); pdata = dev_get_platdata(&client->dev); + if (!pdata) { + pdata = pca955x_pdata_of_init(client, chip); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } /* Make sure the slave address / chip type combo given is possible */ if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != @@ -288,13 +476,11 @@ static int pca955x_probe(struct i2c_client *client, if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -EIO; - if (pdata) { - if (pdata->num_leds != chip->bits) { - dev_err(&client->dev, "board info claims %d LEDs" - " on a %d-bit chip\n", - pdata->num_leds, chip->bits); - return -ENODEV; - } + if (pdata->num_leds != chip->bits) { + dev_err(&client->dev, + "board info claims %d LEDs on a %d-bit chip\n", + pdata->num_leds, chip->bits); + return -ENODEV; } pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); @@ -316,60 +502,92 @@ static int pca955x_probe(struct i2c_client *client, pca955x_led = &pca955x->leds[i]; pca955x_led->led_num = i; pca955x_led->pca955x = pca955x; + pca955x_led->type = pdata->leds[i].type; + + switch (pca955x_led->type) { + case PCA955X_TYPE_NONE: + break; + case PCA955X_TYPE_GPIO: + ngpios++; + break; + case PCA955X_TYPE_LED: + /* + * Platform data can specify LED names and + * default triggers + */ + if (pdata->leds[i].name[0] == '\0') + snprintf(pdata->leds[i].name, + sizeof(pdata->leds[i].name), "%d", i); + + snprintf(pca955x_led->name, + sizeof(pca955x_led->name), "pca955x:%s", + pdata->leds[i].name); - /* Platform data can specify LED names and default triggers */ - if (pdata) { - if (pdata->leds[i].name) - snprintf(pca955x_led->name, - sizeof(pca955x_led->name), "pca955x:%s", - pdata->leds[i].name); if (pdata->leds[i].default_trigger) pca955x_led->led_cdev.default_trigger = pdata->leds[i].default_trigger; - } else { - snprintf(pca955x_led->name, sizeof(pca955x_led->name), - "pca955x:%d", i); - } - pca955x_led->led_cdev.name = pca955x_led->name; - pca955x_led->led_cdev.brightness_set_blocking = pca955x_led_set; + pca955x_led->led_cdev.name = pca955x_led->name; + pca955x_led->led_cdev.brightness_set_blocking = + pca955x_led_set; - err = led_classdev_register(&client->dev, - &pca955x_led->led_cdev); - if (err < 0) - goto exit; - } + err = devm_led_classdev_register(&client->dev, + &pca955x_led->led_cdev); + if (err) + return err; - /* Turn off LEDs */ - for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++) - pca955x_write_ls(client, i, 0x55); + /* Turn off LED */ + err = pca955x_led_set(&pca955x_led->led_cdev, LED_OFF); + if (err) + return err; + } + } /* PWM0 is used for half brightness or 50% duty cycle */ - pca955x_write_pwm(client, 0, 255-LED_HALF); + err = pca955x_write_pwm(client, 0, 255 - LED_HALF); + if (err) + return err; /* PWM1 is used for variable brightness, default to OFF */ - pca955x_write_pwm(client, 1, 0); + err = pca955x_write_pwm(client, 1, 0); + if (err) + return err; /* Set to fast frequency so we do not see flashing */ - pca955x_write_psc(client, 0, 0); - pca955x_write_psc(client, 1, 0); - - return 0; - -exit: - while (i--) - led_classdev_unregister(&pca955x->leds[i].led_cdev); - - return err; -} - -static int pca955x_remove(struct i2c_client *client) -{ - struct pca955x *pca955x = i2c_get_clientdata(client); - int i; - - for (i = 0; i < pca955x->chipdef->bits; i++) - led_classdev_unregister(&pca955x->leds[i].led_cdev); + err = pca955x_write_psc(client, 0, 0); + if (err) + return err; + err = pca955x_write_psc(client, 1, 0); + if (err) + return err; + +#ifdef CONFIG_LEDS_PCA955X_GPIO + if (ngpios) { + pca955x->gpio.label = "gpio-pca955x"; + pca955x->gpio.direction_input = pca955x_gpio_direction_input; + pca955x->gpio.direction_output = pca955x_gpio_direction_output; + pca955x->gpio.set = pca955x_gpio_set_value; + pca955x->gpio.get = pca955x_gpio_get_value; + pca955x->gpio.request = pca955x_gpio_request_pin; + pca955x->gpio.can_sleep = 1; + pca955x->gpio.base = -1; + pca955x->gpio.ngpio = ngpios; + pca955x->gpio.parent = &client->dev; + pca955x->gpio.owner = THIS_MODULE; + + err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, + pca955x); + if (err) { + /* Use data->gpio.dev as a flag for freeing gpiochip */ + pca955x->gpio.parent = NULL; + dev_warn(&client->dev, "could not add gpiochip\n"); + return err; + } + dev_info(&client->dev, "gpios %i...%i\n", + pca955x->gpio.base, pca955x->gpio.base + + pca955x->gpio.ngpio - 1); + } +#endif return 0; } @@ -378,9 +596,9 @@ static struct i2c_driver pca955x_driver = { .driver = { .name = "leds-pca955x", .acpi_match_table = ACPI_PTR(pca955x_acpi_ids), + .of_match_table = of_match_ptr(of_pca955x_match), }, .probe = pca955x_probe, - .remove = pca955x_remove, .id_table = pca955x_id, }; diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c index b2a98c7..b1adbd7 100644 --- a/drivers/leds/leds-powernv.c +++ b/drivers/leds/leds-powernv.c @@ -224,12 +224,8 @@ static int powernv_led_create(struct device *dev, powernv_led->cdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", powernv_led->loc_code, led_type_desc); - if (!powernv_led->cdev.name) { - dev_err(dev, - "%s: Memory allocation failed for classdev name\n", - __func__); + if (!powernv_led->cdev.name) return -ENOMEM; - } powernv_led->cdev.brightness_set_blocking = powernv_brightness_set; powernv_led->cdev.brightness_get = powernv_brightness_get; diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c index 30453164..f5357f6 100644 --- a/drivers/leds/leds-tlc591xx.c +++ b/drivers/leds/leds-tlc591xx.c @@ -230,12 +230,15 @@ tlc591xx_probe(struct i2c_client *client, for_each_child_of_node(np, child) { err = of_property_read_u32(child, "reg", ®); - if (err) + if (err) { + of_node_put(child); return err; - if (reg < 0 || reg >= tlc591xx->max_leds) - return -EINVAL; - if (priv->leds[reg].active) + } + if (reg < 0 || reg >= tlc591xx->max_leds || + priv->leds[reg].active) { + of_node_put(child); return -EINVAL; + } priv->leds[reg].active = true; priv->leds[reg].ldev.name = of_get_property(child, "label", NULL) ? : child->name; diff --git a/include/dt-bindings/leds/leds-pca955x.h b/include/dt-bindings/leds/leds-pca955x.h new file mode 100644 index 0000000..78cb7e9 --- /dev/null +++ b/include/dt-bindings/leds/leds-pca955x.h @@ -0,0 +1,16 @@ +/* + * This header provides constants for pca955x LED bindings. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef _DT_BINDINGS_LEDS_PCA955X_H +#define _DT_BINDINGS_LEDS_PCA955X_H + +#define PCA955X_TYPE_NONE 0 +#define PCA955X_TYPE_LED 1 +#define PCA955X_TYPE_GPIO 2 + +#endif /* _DT_BINDINGS_LEDS_PCA955X_H */ diff --git a/include/linux/leds.h b/include/linux/leds.h index 64c56d4..bf6db4f 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -49,6 +49,7 @@ struct led_classdev { #define LED_HW_PLUGGABLE (1 << 19) #define LED_PANIC_INDICATOR (1 << 20) #define LED_BRIGHT_HW_CHANGED (1 << 21) +#define LED_RETAIN_AT_SHUTDOWN (1 << 22) /* set_brightness_work / blink_timer flags, atomic, private. */ unsigned long work_flags; @@ -392,6 +393,7 @@ struct gpio_led { unsigned retain_state_suspended : 1; unsigned panic_indicator : 1; unsigned default_state : 2; + unsigned retain_state_shutdown : 1; /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ struct gpio_desc *gpiod; }; |