--- /dev/null
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktz8866.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Kinetic Technologies KTZ8866 backlight
+
+maintainers:
+ - Jianhua Lu <lujianhua000@gmail.com>
+
+description: |
+ The Kinetic Technologies KTZ8866 is a high efficiency 6-channels-current-sinks
+ led backlight with dual lcd bias power.
+ https://www.kinet-ic.com/ktz8866/
+
+allOf:
+ - $ref: common.yaml#
+
+properties:
+ compatible:
+ const: kinetic,ktz8866
+
+ vddpos-supply:
+ description: positive boost supply regulator.
+
+ vddneg-supply:
+ description: negative boost supply regulator.
+
+ enable-gpios:
+ description: GPIO to use to enable/disable the backlight (HWEN pin).
+ maxItems: 1
+
+ current-num-sinks:
+ description: number of the LED current sinks' channels.
+ enum: [1, 2, 3, 4, 5, 6]
+
+ kinetic,current-ramp-delay-ms:
+ description: |
+ LED current ramping delay time in milliseconds, note that the
+ case 1 will be mapped to 1μs.
+ enum: [1, 2, 4, 8, 16, 32, 64, 128, 192, 256, 320, 384, 448, 512, 576, 640]
+
+ kinetic,led-enable-ramp-delay-ms:
+ description: |
+ LED on/off ramping delay time in milliseconds, note that the case 0 will be
+ mapped to 512μs because ktz8866 can't ramp faster than it.
+ enum: [0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384]
+
+ kinetic,enable-lcd-bias:
+ description: Set if we want to output bias power supply for LCD.
+ type: boolean
+
+required:
+ - compatible
+ - vddpos-supply
+ - vddneg-supply
+ - enable-gpios
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ backlight {
+ compatible = "kinetic,ktz8866";
+
+ vddpos-supply = <&bl_vddpos_5p5>;
+ vddneg-supply = <&bl_vddneg_5p5>;
+ enable-gpios = <&tlmm 139 GPIO_ACTIVE_HIGH>;
+ current-num-sinks = <5>;
+ kinetic,current-ramp-delay-ms = <128>;
+ kinetic,led-enable-ramp-delay-ms = <1>;
+ kinetic,enable-lcd-bias;
+ };
compatible:
enum:
- qcom,pm8941-wled
+ - qcom,pmi8950-wled
- qcom,pmi8994-wled
- qcom,pmi8998-wled
- qcom,pm660l-wled
S: Maintained
F: tools/testing/ktest
+KTZ8866 BACKLIGHT DRIVER
+M: Jianhua Lu <lujianhua000@gmail.com>
+S: Maintained
+F: Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
+F: drivers/video/backlight/ktz8866.c
+
L3MDEV
M: David Ahern <dsahern@kernel.org>
L: netdev@vger.kernel.org
This driver provides a platform-device registered LCD power
control interface.
-config LCD_TOSA
- tristate "Sharp SL-6000 LCD Driver"
- depends on I2C && SPI && MACH_TOSA
- help
- If you have an Sharp SL-6000 Zaurus say Y to enable a driver
- for its LCD.
-
config LCD_HP700
tristate "HP Jornada 700 series LCD Driver"
depends on SA1100_JORNADA720_SSP && !PREEMPTION
which is a 1-wire GPIO-controlled backlight found in some mobile
phones.
+config BACKLIGHT_KTZ8866
+ tristate "Backlight Driver for Kinetic KTZ8866"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say Y to enable the backlight driver for the Kinetic KTZ8866
+ found in Xiaomi Mi Pad 5 series.
+
config BACKLIGHT_LM3533
tristate "Backlight Driver for LM3533"
depends on MFD_LM3533
If you have an Intel-based Apple say Y to enable a driver for its
backlight.
-config BACKLIGHT_TOSA
- tristate "Sharp SL-6000 Backlight Driver"
- depends on I2C && MACH_TOSA && LCD_TOSA
- help
- If you have an Sharp SL-6000 Zaurus say Y to enable a driver
- for its backlight
-
config BACKLIGHT_QCOM_WLED
tristate "Qualcomm PMIC WLED Driver"
select REGMAP
obj-$(CONFIG_LCD_OTM3225A) += otm3225a.o
obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
obj-$(CONFIG_LCD_TDO24M) += tdo24m.o
-obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o
obj-$(CONFIG_BACKLIGHT_KTD253) += ktd253-backlight.o
+obj-$(CONFIG_BACKLIGHT_KTZ8866) += ktz8866.o
obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o
obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
obj-$(CONFIG_BACKLIGHT_RT4831) += rt4831-backlight.o
obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o
-obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
obj-$(CONFIG_BACKLIGHT_ARCXCNN) += arcxcnn_bl.o
struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd);
struct aat2870_data *aat2870 =
dev_get_drvdata(aat2870_bl->pdev->dev.parent);
- int brightness = bd->props.brightness;
+ int brightness = backlight_get_brightness(bd);
int ret;
if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
bd->props.brightness, bd->props.power, bd->props.state);
- if ((bd->props.power != FB_BLANK_UNBLANK) ||
- (bd->props.state & BL_CORE_FBBLANK) ||
- (bd->props.state & BL_CORE_SUSPENDED))
- brightness = 0;
-
ret = aat2870->write(aat2870, AAT2870_BLM,
(u8)aat2870_brightness(aat2870_bl, brightness));
if (ret < 0)
static int arcxcnn_bl_update_status(struct backlight_device *bl)
{
struct arcxcnn *lp = bl_get_data(bl);
- u32 brightness = bl->props.brightness;
+ u32 brightness = backlight_get_brightness(bl);
int ret;
- if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
- brightness = 0;
-
ret = arcxcnn_set_brightness(lp, brightness);
if (ret)
return ret;
*
* This function looks up a backlight device by its name. It obtains a reference
* on the backlight device and it is the caller's responsibility to drop the
- * reference by calling backlight_put().
+ * reference by calling put_device().
*
* Returns:
* A pointer to the backlight device if found, otherwise NULL.
static int micro_bl_update_status(struct backlight_device *bd)
{
struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);
- int intensity = bd->props.brightness;
+ int intensity = backlight_get_brightness(bd);
struct ipaq_micro_msg msg = {
.id = MSG_BACKLIGHT,
.tx_len = 3,
};
- if (bd->props.power != FB_BLANK_UNBLANK)
- intensity = 0;
- if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))
- intensity = 0;
-
/*
* Message format:
* Byte 0: backlight instance (usually 1)
}
ktd253->gpiod = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
- if (IS_ERR(ktd253->gpiod)) {
- ret = PTR_ERR(ktd253->gpiod);
- if (ret != -EPROBE_DEFER)
- dev_err(dev, "gpio line missing or invalid.\n");
- return ret;
- }
+ if (IS_ERR(ktd253->gpiod))
+ return dev_err_probe(dev, PTR_ERR(ktd253->gpiod),
+ "gpio line missing or invalid.\n");
gpiod_set_consumer_name(ktd253->gpiod, dev_name(dev));
/* Bring backlight to a known off state */
msleep(KTD253_T_OFF_MS);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Backlight driver for the Kinetic KTZ8866
+ *
+ * Copyright (C) 2022, 2023 Jianhua Lu <lujianhua000@gmail.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#define DEFAULT_BRIGHTNESS 1500
+#define MAX_BRIGHTNESS 2047
+#define REG_MAX 0x15
+
+/* reg */
+#define DEVICE_ID 0x01
+#define BL_CFG1 0x02
+#define BL_CFG2 0x03
+#define BL_BRT_LSB 0x04
+#define BL_BRT_MSB 0x05
+#define BL_EN 0x08
+#define LCD_BIAS_CFG1 0x09
+#define LCD_BIAS_CFG2 0x0A
+#define LCD_BIAS_CFG3 0x0B
+#define LCD_BOOST_CFG 0x0C
+#define OUTP_CFG 0x0D
+#define OUTN_CFG 0x0E
+#define FLAG 0x0F
+#define BL_OPTION1 0x10
+#define BL_OPTION2 0x11
+#define PWM2DIG_LSBs 0x12
+#define PWM2DIG_MSBs 0x13
+#define BL_DIMMING 0x14
+#define PWM_RAMP_TIME 0x15
+
+/* definition */
+#define BL_EN_BIT BIT(6)
+#define LCD_BIAS_EN 0x9F
+#define PWM_HYST 0x5
+
+struct ktz8866 {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ bool led_on;
+ struct gpio_desc *enable_gpio;
+};
+
+static const struct regmap_config ktz8866_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = REG_MAX,
+};
+
+static int ktz8866_write(struct ktz8866 *ktz, unsigned int reg,
+ unsigned int val)
+{
+ return regmap_write(ktz->regmap, reg, val);
+}
+
+static int ktz8866_update_bits(struct ktz8866 *ktz, unsigned int reg,
+ unsigned int mask, unsigned int val)
+{
+ return regmap_update_bits(ktz->regmap, reg, mask, val);
+}
+
+static int ktz8866_backlight_update_status(struct backlight_device *backlight_dev)
+{
+ struct ktz8866 *ktz = bl_get_data(backlight_dev);
+ unsigned int brightness = backlight_get_brightness(backlight_dev);
+
+ if (!ktz->led_on && brightness > 0) {
+ ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, BL_EN_BIT);
+ ktz->led_on = true;
+ } else if (brightness == 0) {
+ ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, 0);
+ ktz->led_on = false;
+ }
+
+ /* Set brightness */
+ ktz8866_write(ktz, BL_BRT_LSB, brightness & 0x7);
+ ktz8866_write(ktz, BL_BRT_MSB, (brightness >> 3) & 0xFF);
+
+ return 0;
+}
+
+static const struct backlight_ops ktz8866_backlight_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = ktz8866_backlight_update_status,
+};
+
+static void ktz8866_init(struct ktz8866 *ktz)
+{
+ unsigned int val = 0;
+
+ if (of_property_read_u32(ktz->client->dev.of_node, "current-num-sinks", &val))
+ ktz8866_write(ktz, BL_EN, BIT(val) - 1);
+ else
+ /* Enable all 6 current sinks if the number of current sinks isn't specified. */
+ ktz8866_write(ktz, BL_EN, BIT(6) - 1);
+
+ if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,current-ramp-delay-ms", &val)) {
+ if (val <= 128)
+ ktz8866_write(ktz, BL_CFG2, BIT(7) | (ilog2(val) << 3) | PWM_HYST);
+ else
+ ktz8866_write(ktz, BL_CFG2, BIT(7) | ((5 + val / 64) << 3) | PWM_HYST);
+ }
+
+ if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,led-enable-ramp-delay-ms", &val)) {
+ if (val == 0)
+ ktz8866_write(ktz, BL_DIMMING, 0);
+ else {
+ unsigned int ramp_off_time = ilog2(val) + 1;
+ unsigned int ramp_on_time = ramp_off_time << 4;
+ ktz8866_write(ktz, BL_DIMMING, ramp_on_time | ramp_off_time);
+ }
+ }
+
+ if (of_property_read_bool(ktz->client->dev.of_node, "kinetic,enable-lcd-bias"))
+ ktz8866_write(ktz, LCD_BIAS_CFG1, LCD_BIAS_EN);
+}
+
+static int ktz8866_probe(struct i2c_client *client)
+{
+ struct backlight_device *backlight_dev;
+ struct backlight_properties props;
+ struct ktz8866 *ktz;
+ int ret = 0;
+
+ ktz = devm_kzalloc(&client->dev, sizeof(*ktz), GFP_KERNEL);
+ if (!ktz)
+ return -ENOMEM;
+
+ ktz->client = client;
+ ktz->regmap = devm_regmap_init_i2c(client, &ktz8866_regmap_config);
+ if (IS_ERR(ktz->regmap))
+ return dev_err_probe(&client->dev, PTR_ERR(ktz->regmap), "failed to init regmap\n");
+
+ ret = devm_regulator_get_enable(&client->dev, "vddpos");
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "get regulator vddpos failed\n");
+ ret = devm_regulator_get_enable(&client->dev, "vddneg");
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "get regulator vddneg failed\n");
+
+ ktz->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(ktz->enable_gpio))
+ return PTR_ERR(ktz->enable_gpio);
+
+ memset(&props, 0, sizeof(props));
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = MAX_BRIGHTNESS;
+ props.brightness = DEFAULT_BRIGHTNESS;
+ props.scale = BACKLIGHT_SCALE_LINEAR;
+
+ backlight_dev = devm_backlight_device_register(&client->dev, "ktz8866-backlight",
+ &client->dev, ktz, &ktz8866_backlight_ops, &props);
+ if (IS_ERR(backlight_dev))
+ return dev_err_probe(&client->dev, PTR_ERR(backlight_dev),
+ "failed to register backlight device\n");
+
+ ktz8866_init(ktz);
+
+ i2c_set_clientdata(client, backlight_dev);
+ backlight_update_status(backlight_dev);
+
+ return 0;
+}
+
+static void ktz8866_remove(struct i2c_client *client)
+{
+ struct backlight_device *backlight_dev = i2c_get_clientdata(client);
+ backlight_dev->props.brightness = 0;
+ backlight_update_status(backlight_dev);
+}
+
+static const struct i2c_device_id ktz8866_ids[] = {
+ { "ktz8866", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ktz8866_ids);
+
+static const struct of_device_id ktz8866_match_table[] = {
+ {
+ .compatible = "kinetic,ktz8866",
+ },
+ {},
+};
+
+static struct i2c_driver ktz8866_driver = {
+ .driver = {
+ .name = "ktz8866",
+ .of_match_table = ktz8866_match_table,
+ },
+ .probe_new = ktz8866_probe,
+ .remove = ktz8866_remove,
+ .id_table = ktz8866_ids,
+};
+
+module_i2c_driver(ktz8866_driver);
+
+MODULE_DESCRIPTION("Kinetic KTZ8866 Backlight Driver");
+MODULE_AUTHOR("Jianhua Lu <lujianhua000@gmail.com>");
+MODULE_LICENSE("GPL");
struct regulator *power_supply;
struct gpio_desc *enable_gpio;
unsigned int scale;
- bool legacy;
unsigned int post_pwm_on_delay;
unsigned int pwm_off_delay;
int (*notify)(struct device *,
static void pwm_backlight_power_on(struct pwm_bl_data *pb)
{
- struct pwm_state state;
int err;
- pwm_get_state(pb->pwm, &state);
if (pb->enabled)
return;
- err = regulator_enable(pb->power_supply);
- if (err < 0)
- dev_err(pb->dev, "failed to enable power supply\n");
-
- state.enabled = true;
- pwm_apply_state(pb->pwm, &state);
+ if (pb->power_supply) {
+ err = regulator_enable(pb->power_supply);
+ if (err < 0)
+ dev_err(pb->dev, "failed to enable power supply\n");
+ }
if (pb->post_pwm_on_delay)
msleep(pb->post_pwm_on_delay);
static void pwm_backlight_power_off(struct pwm_bl_data *pb)
{
- struct pwm_state state;
-
- pwm_get_state(pb->pwm, &state);
if (!pb->enabled)
return;
if (pb->pwm_off_delay)
msleep(pb->pwm_off_delay);
- state.enabled = false;
- state.duty_cycle = 0;
- pwm_apply_state(pb->pwm, &state);
-
- regulator_disable(pb->power_supply);
+ if (pb->power_supply)
+ regulator_disable(pb->power_supply);
pb->enabled = false;
}
-static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)
+static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness, struct pwm_state *state)
{
unsigned int lth = pb->lth_brightness;
- struct pwm_state state;
u64 duty_cycle;
- pwm_get_state(pb->pwm, &state);
-
if (pb->levels)
duty_cycle = pb->levels[brightness];
else
duty_cycle = brightness;
- duty_cycle *= state.period - lth;
+ duty_cycle *= state->period - lth;
do_div(duty_cycle, pb->scale);
return duty_cycle + lth;
if (brightness > 0) {
pwm_get_state(pb->pwm, &state);
- state.duty_cycle = compute_duty_cycle(pb, brightness);
+ state.duty_cycle = compute_duty_cycle(pb, brightness, &state);
+ state.enabled = true;
pwm_apply_state(pb->pwm, &state);
+
pwm_backlight_power_on(pb);
} else {
pwm_backlight_power_off(pb);
+
+ pwm_get_state(pb->pwm, &state);
+ state.duty_cycle = 0;
+ /*
+ * We cannot assume a disabled PWM to drive its output to the
+ * inactive state. If we have an enable GPIO and/or a regulator
+ * we assume that this isn't relevant and we can disable the PWM
+ * to save power. If however there is neither an enable GPIO nor
+ * a regulator keep the PWM on be sure to get a constant
+ * inactive output.
+ */
+ state.enabled = !pb->power_supply && !pb->enable_gpio;
+ pwm_apply_state(pb->pwm, &state);
}
if (pb->notify_after)
if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)
active = false;
- if (!regulator_is_enabled(pb->power_supply))
+ if (pb->power_supply && !regulator_is_enabled(pb->power_supply))
active = false;
if (!pwm_is_enabled(pb->pwm))
struct platform_pwm_backlight_data defdata;
struct backlight_properties props;
struct backlight_device *bl;
- struct device_node *node = pdev->dev.of_node;
struct pwm_bl_data *pb;
struct pwm_state state;
unsigned int i;
goto err_alloc;
}
- pb->power_supply = devm_regulator_get(&pdev->dev, "power");
+ pb->power_supply = devm_regulator_get_optional(&pdev->dev, "power");
if (IS_ERR(pb->power_supply)) {
ret = PTR_ERR(pb->power_supply);
- goto err_alloc;
+ if (ret == -ENODEV)
+ pb->power_supply = NULL;
+ else
+ goto err_alloc;
}
pb->pwm = devm_pwm_get(&pdev->dev, NULL);
- if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {
- dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
- pb->legacy = true;
- pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
- }
-
if (IS_ERR(pb->pwm)) {
ret = PTR_ERR(pb->pwm);
if (ret != -EPROBE_DEFER)
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
ret = PTR_ERR(bl);
- if (pb->legacy)
- pwm_free(pb->pwm);
goto err_alloc;
}
if (pb->exit)
pb->exit(&pdev->dev);
- if (pb->legacy)
- pwm_free(pb->pwm);
return 0;
}
#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1)
/**
- * struct sky81452_platform_data
+ * struct sky81452_bl_platform_data - backlight platform data
* @name: backlight driver name.
* If it is not defined, default name is lcd-backlight.
* @gpiod_enable:GPIO descriptor which control EN pin
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * LCD / Backlight control code for Sharp SL-6000x (tosa)
- *
- * Copyright (c) 2005 Dirk Opfer
- * Copyright (c) 2007,2008 Dmitry Baryshkov
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/spi/spi.h>
-#include <linux/i2c.h>
-#include <linux/gpio/consumer.h>
-#include <linux/fb.h>
-#include <linux/backlight.h>
-#include <linux/slab.h>
-
-#include <asm/mach/sharpsl_param.h>
-
-#include "tosa_bl.h"
-
-#define COMADJ_DEFAULT 97
-
-#define DAC_CH1 0
-#define DAC_CH2 1
-
-struct tosa_bl_data {
- struct i2c_client *i2c;
- struct backlight_device *bl;
- struct gpio_desc *gpio;
-
- int comadj;
-};
-
-static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
-{
- struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
-
- i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
-
- /* SetBacklightDuty */
- i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
-
- /* SetBacklightVR */
- gpiod_set_value(data->gpio, brightness & 0x100);
-
- tosa_bl_enable(spi, brightness);
-}
-
-static int tosa_bl_update_status(struct backlight_device *dev)
-{
- struct backlight_properties *props = &dev->props;
- struct tosa_bl_data *data = bl_get_data(dev);
- int power = max(props->power, props->fb_blank);
- int brightness = props->brightness;
-
- if (power)
- brightness = 0;
-
- tosa_bl_set_backlight(data, brightness);
-
- return 0;
-}
-
-static int tosa_bl_get_brightness(struct backlight_device *dev)
-{
- struct backlight_properties *props = &dev->props;
-
- return props->brightness;
-}
-
-static const struct backlight_ops bl_ops = {
- .get_brightness = tosa_bl_get_brightness,
- .update_status = tosa_bl_update_status,
-};
-
-static int tosa_bl_probe(struct i2c_client *client)
-{
- struct backlight_properties props;
- struct tosa_bl_data *data;
- int ret = 0;
-
- data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
- GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
- data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW);
- ret = PTR_ERR_OR_ZERO(data->gpio);
- if (ret) {
- dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
- return ret;
- }
-
- i2c_set_clientdata(client, data);
- data->i2c = client;
-
- memset(&props, 0, sizeof(struct backlight_properties));
- props.type = BACKLIGHT_RAW;
- props.max_brightness = 512 - 1;
- data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
- &client->dev, data, &bl_ops,
- &props);
- if (IS_ERR(data->bl)) {
- ret = PTR_ERR(data->bl);
- goto err_reg;
- }
-
- data->bl->props.brightness = 69;
- data->bl->props.power = FB_BLANK_UNBLANK;
-
- backlight_update_status(data->bl);
-
- return 0;
-
-err_reg:
- data->bl = NULL;
- return ret;
-}
-
-static void tosa_bl_remove(struct i2c_client *client)
-{
- struct tosa_bl_data *data = i2c_get_clientdata(client);
-
- data->bl = NULL;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tosa_bl_suspend(struct device *dev)
-{
- struct tosa_bl_data *data = dev_get_drvdata(dev);
-
- tosa_bl_set_backlight(data, 0);
-
- return 0;
-}
-
-static int tosa_bl_resume(struct device *dev)
-{
- struct tosa_bl_data *data = dev_get_drvdata(dev);
-
- backlight_update_status(data->bl);
- return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
-
-static const struct i2c_device_id tosa_bl_id[] = {
- { "tosa-bl", 0 },
- { },
-};
-MODULE_DEVICE_TABLE(i2c, tosa_bl_id);
-
-static struct i2c_driver tosa_bl_driver = {
- .driver = {
- .name = "tosa-bl",
- .pm = &tosa_bl_pm_ops,
- },
- .probe_new = tosa_bl_probe,
- .remove = tosa_bl_remove,
- .id_table = tosa_bl_id,
-};
-
-module_i2c_driver(tosa_bl_driver);
-
-MODULE_AUTHOR("Dmitry Baryshkov");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
-
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef _TOSA_BL_H
-#define _TOSA_BL_H
-
-struct spi_device;
-extern int tosa_bl_enable(struct spi_device *spi, int enable);
-
-#endif
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * LCD / Backlight control code for Sharp SL-6000x (tosa)
- *
- * Copyright (c) 2005 Dirk Opfer
- * Copyright (c) 2007,2008 Dmitry Baryshkov
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/spi/spi.h>
-#include <linux/i2c.h>
-#include <linux/slab.h>
-#include <linux/gpio/consumer.h>
-#include <linux/delay.h>
-#include <linux/lcd.h>
-#include <linux/fb.h>
-
-#include <asm/mach/sharpsl_param.h>
-
-#include "tosa_bl.h"
-
-#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
-
-#define TG_REG0_VQV 0x0001
-#define TG_REG0_COLOR 0x0002
-#define TG_REG0_UD 0x0004
-#define TG_REG0_LR 0x0008
-
-/*
- * Timing Generator
- */
-#define TG_PNLCTL 0x00
-#define TG_TPOSCTL 0x01
-#define TG_DUTYCTL 0x02
-#define TG_GPOSR 0x03
-#define TG_GPODR1 0x04
-#define TG_GPODR2 0x05
-#define TG_PINICTL 0x06
-#define TG_HPOSCTL 0x07
-
-
-#define DAC_BASE 0x4e
-
-struct tosa_lcd_data {
- struct spi_device *spi;
- struct lcd_device *lcd;
- struct i2c_client *i2c;
- struct gpio_desc *gpiod_tg;
-
- int lcd_power;
- bool is_vga;
-};
-
-static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
-{
- u8 buf[1];
- struct spi_message msg;
- struct spi_transfer xfer = {
- .len = 1,
- .cs_change = 0,
- .tx_buf = buf,
- };
-
- buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
-
- return spi_sync(spi, &msg);
-}
-
-int tosa_bl_enable(struct spi_device *spi, int enable)
-{
- /* bl_enable GP04=1 otherwise GP04=0*/
- return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
-}
-EXPORT_SYMBOL(tosa_bl_enable);
-
-static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
-{
- /* TG on */
- gpiod_set_value(data->gpiod_tg, 0);
-
- mdelay(60);
-
- /* delayed 0clk TCTL signal for VGA */
- tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
- /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
- tosa_tg_send(data->spi, TG_GPOSR, 0x02);
-}
-
-static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
-{
- struct spi_device *spi = data->spi;
- int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
-
- if (data->is_vga)
- value |= TG_REG0_VQV;
-
- tosa_tg_send(spi, TG_PNLCTL, value);
-
- /* TG LCD pannel power up */
- tosa_tg_send(spi, TG_PINICTL, 0x4);
- mdelay(50);
-
- /* TG LCD GVSS */
- tosa_tg_send(spi, TG_PINICTL, 0x0);
-
- if (IS_ERR_OR_NULL(data->i2c)) {
- /*
- * after the pannel is powered up the first time,
- * we can access the i2c bus so probe for the DAC
- */
- struct i2c_adapter *adap = i2c_get_adapter(0);
- struct i2c_board_info info = {
- .dev_name = "tosa-bl",
- .type = "tosa-bl",
- .addr = DAC_BASE,
- .platform_data = data->spi,
- };
- data->i2c = i2c_new_client_device(adap, &info);
- }
-}
-
-static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
-{
- struct spi_device *spi = data->spi;
-
- /* TG LCD VHSA off */
- tosa_tg_send(spi, TG_PINICTL, 0x4);
- mdelay(50);
-
- /* TG LCD signal off */
- tosa_tg_send(spi, TG_PINICTL, 0x6);
- mdelay(50);
-
- /* TG Off */
- gpiod_set_value(data->gpiod_tg, 1);
- mdelay(100);
-}
-
-int tosa_lcd_set_power(struct lcd_device *lcd, int power)
-{
- struct tosa_lcd_data *data = lcd_get_data(lcd);
-
- if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
- tosa_lcd_tg_on(data);
-
- if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
- tosa_lcd_tg_off(data);
-
- data->lcd_power = power;
- return 0;
-}
-
-static int tosa_lcd_get_power(struct lcd_device *lcd)
-{
- struct tosa_lcd_data *data = lcd_get_data(lcd);
-
- return data->lcd_power;
-}
-
-static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
-{
- struct tosa_lcd_data *data = lcd_get_data(lcd);
-
- if (mode->xres == 320 || mode->yres == 320)
- data->is_vga = false;
- else
- data->is_vga = true;
-
- if (POWER_IS_ON(data->lcd_power))
- tosa_lcd_tg_on(data);
-
- return 0;
-}
-
-static struct lcd_ops tosa_lcd_ops = {
- .set_power = tosa_lcd_set_power,
- .get_power = tosa_lcd_get_power,
- .set_mode = tosa_lcd_set_mode,
-};
-
-static int tosa_lcd_probe(struct spi_device *spi)
-{
- int ret;
- struct tosa_lcd_data *data;
-
- data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
- GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->is_vga = true; /* default to VGA mode */
-
- /*
- * bits_per_word cannot be configured in platform data
- */
- spi->bits_per_word = 8;
-
- ret = spi_setup(spi);
- if (ret < 0)
- return ret;
-
- data->spi = spi;
- spi_set_drvdata(spi, data);
-
- data->gpiod_tg = devm_gpiod_get(&spi->dev, "tg #pwr", GPIOD_OUT_LOW);
- if (IS_ERR(data->gpiod_tg))
- return PTR_ERR(data->gpiod_tg);
-
- mdelay(60);
-
- tosa_lcd_tg_init(data);
-
- tosa_lcd_tg_on(data);
-
- data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
- data, &tosa_lcd_ops);
-
- if (IS_ERR(data->lcd)) {
- ret = PTR_ERR(data->lcd);
- data->lcd = NULL;
- goto err_register;
- }
-
- return 0;
-
-err_register:
- tosa_lcd_tg_off(data);
- return ret;
-}
-
-static void tosa_lcd_remove(struct spi_device *spi)
-{
- struct tosa_lcd_data *data = spi_get_drvdata(spi);
-
- i2c_unregister_device(data->i2c);
-
- tosa_lcd_tg_off(data);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tosa_lcd_suspend(struct device *dev)
-{
- struct tosa_lcd_data *data = dev_get_drvdata(dev);
-
- tosa_lcd_tg_off(data);
-
- return 0;
-}
-
-static int tosa_lcd_resume(struct device *dev)
-{
- struct tosa_lcd_data *data = dev_get_drvdata(dev);
-
- tosa_lcd_tg_init(data);
- if (POWER_IS_ON(data->lcd_power))
- tosa_lcd_tg_on(data);
- else
- tosa_lcd_tg_off(data);
-
- return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
-
-static struct spi_driver tosa_lcd_driver = {
- .driver = {
- .name = "tosa-lcd",
- .pm = &tosa_lcd_pm_ops,
- },
- .probe = tosa_lcd_probe,
- .remove = tosa_lcd_remove,
-};
-
-module_spi_driver(tosa_lcd_driver);
-
-MODULE_AUTHOR("Dmitry Baryshkov");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
-MODULE_ALIAS("spi:tosa-lcd");
#include <linux/backlight.h>
struct platform_pwm_backlight_data {
- int pwm_id;
unsigned int max_brightness;
unsigned int dft_brightness;
unsigned int lth_brightness;
git.samba.org / sfrench / cifs-2.6.git / commitdiff