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path: root/drivers/video/backlight/tosa_bl.c
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Diffstat (limited to 'drivers/video/backlight/tosa_bl.c')
-rw-r--r--drivers/video/backlight/tosa_bl.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c
new file mode 100644
index 000000000..f55b3d616
--- /dev/null
+++ b/drivers/video/backlight/tosa_bl.c
@@ -0,0 +1,173 @@
+// 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,
+ const struct i2c_device_id *id)
+{
+ 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 = 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");
+