The TPS65217 chip contains a boost converter and current sinks which can be
used to drive LEDs for use as backlights. Expose this functionality via the
backlight API.
Signed-off-by: Matthias Kaehlcke <matthias@xxxxxxxxxxxx>
---
drivers/mfd/tps65217.c | 71 +++++++++
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/tps65217_bl.c | 272 +++++++++++++++++++++++++++++++++
include/linux/mfd/tps65217.h | 19 +++
5 files changed, 370 insertions(+)
create mode 100644 drivers/video/backlight/tps65217_bl.c
diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
index 61c097a..c248bb3 100644
--- a/drivers/mfd/tps65217.c
+++ b/drivers/mfd/tps65217.c
@@ -29,6 +29,12 @@
#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>
+#if defined(CONFIG_BACKLIGHT_TPS65217) || defined(CONFIG_BACKLIGHT_TPS65217_MODULE)
+#define tps_has_bl() true
+#else
+#define tps_has_bl() false
+#endif
+
/**
* tps65217_reg_read: Read a single tps65217 register.
*
@@ -174,6 +180,47 @@ static struct tps65217_board *tps65217_parse_dt(struct i2c_client *client)
pdata->of_node[i] = reg_matches[i].of_node;
}
+ if (tps_has_bl()) {
+ struct device_node *np = of_find_node_by_name(node, "backlight");
+ if (np) {
+ u32 val;
+
+ pdata->bl_pdata = devm_kzalloc(&client->dev, sizeof(*pdata->bl_pdata), GFP_KERNEL);
+ if (!pdata->bl_pdata)
+ return NULL;
+
+ if (!of_property_read_u32(np, "isel", &val)) {
+ if (val == 1) {
+ pdata->bl_pdata->isel = TPS65217_BL_ISET1;
+ } else if (val == 2) {
+ pdata->bl_pdata->isel = TPS65217_BL_ISET2;
+ } else {
+ dev_err(&client->dev, "invalid value for backlight current limit selection in the device tree\n");
+ return NULL;
+ }
+ } else {
+ pdata->bl_pdata->isel = TPS65217_BL_ISET1;
+ }
+
+ if (!of_property_read_u32(np, "fdim", &val)) {
+ if (val == 100) {
+ pdata->bl_pdata->fdim = TPS65217_BL_FDIM_100HZ;
+ } else if (val == 200) {
+ pdata->bl_pdata->fdim = TPS65217_BL_FDIM_200HZ;
+ } else if (val == 500) {
+ pdata->bl_pdata->fdim = TPS65217_BL_FDIM_500HZ;
+ } else if (val == 1000) {
+ pdata->bl_pdata->fdim = TPS65217_BL_FDIM_1000HZ;
+ } else {
+ dev_err(&client->dev, "invalid value for backlight dimming frequency in the device tree\n");
+ return NULL;
+ }
+ } else {
+ pdata->bl_pdata->fdim = TPS65217_BL_FDIM_200HZ;
+ }
+ }
+ }
+
return pdata;
}
@@ -250,7 +297,28 @@ static int __devinit tps65217_probe(struct i2c_client *client,
platform_device_add(pdev);
}
+ if (tps_has_bl() &&
+ pdata->bl_pdata) {
+ tps->bl_pdev = platform_device_alloc("tps65217-bl", 0);
+ if (!tps->bl_pdev) {
+ dev_err(tps->dev, "Cannot create backlight platform device\n");
+ ret = -ENOMEM;
+ goto err_alloc_bl_pdev;
+ }
+
+ tps->bl_pdev->dev.parent = tps->dev;
+ tps->bl_pdev->dev.platform_data = pdata->bl_pdata;
+
+ platform_device_add(tps->bl_pdev);
+ }
+
return 0;
+
+err_alloc_bl_pdev:
+ for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
+ platform_device_unregister(tps->regulator_pdev[i]);
+
+ return ret;
}
static int __devexit tps65217_remove(struct i2c_client *client)
@@ -258,6 +326,9 @@ static int __devexit tps65217_remove(struct i2c_client *client)
struct tps65217 *tps = i2c_get_clientdata(client);
int i;
+ if (tps->bl_pdev)
+ platform_device_unregister(tps->bl_pdev);
+
for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
platform_device_unregister(tps->regulator_pdev[i]);
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 2979292..6fb8bd7 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -373,6 +373,13 @@ config BACKLIGHT_PANDORA
If you have a Pandora console, say Y to enable the
backlight driver.
+config BACKLIGHT_TPS65217
+ tristate "Backlight driver for TI TPS65217 using WLED"
+ depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
+ help
+ If you have a Texas Instruments TPS65217 say Y to enable the
+ backlight driver.
+
endif # BACKLIGHT_CLASS_DEVICE
endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index a2ac9cf..00223a6 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -43,3 +43,4 @@ obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o
+obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
new file mode 100644
index 0000000..ca26c61
--- /dev/null
+++ b/drivers/video/backlight/tps65217_bl.c
@@ -0,0 +1,272 @@
+/*
+ * tps65217_bl.c
+ *
+ * TPS65217 backlight driver
+ *
+ * Copyright (C) 2012 Matthias Kaehlcke
+ * Author: Matthias Kaehlcke <matthias@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/mfd/tps65217.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+struct tps65217_bl
+{
+ struct tps65217 *tps;
+ struct device *dev;
+ struct backlight_device *bl;
+ int on;
+};
+
+struct tps65217_bl_pdata tps65217_bl_default_pdata = {
+ .isel = TPS65217_BL_ISET1,
+ .fdim = TPS65217_BL_FDIM_200HZ
+};
+
+static int tps65217_bl_enable(struct tps65217_bl *tps65217_bl)
+{
+ int rc;
+
+ rc = tps65217_set_bits(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL1,
+ TPS65217_WLEDCTRL1_ISINK_ENABLE,
+ TPS65217_WLEDCTRL1_ISINK_ENABLE,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to enable backlight: %d\n", rc);
+ return rc;
+ }
+
+ tps65217_bl->on = 1;
+
+ dev_dbg(tps65217_bl->dev, "backlight enabled\n");
+
+ return 0;
+}
+
+static int tps65217_bl_disable(struct tps65217_bl *tps65217_bl)
+{
+ int rc;
+
+ rc = tps65217_clear_bits(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL1,
+ TPS65217_WLEDCTRL1_ISINK_ENABLE,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to disable backlight: %d\n", rc);
+ return rc;
+ }
+
+ tps65217_bl->on = 0;
+
+ dev_dbg(tps65217_bl->dev, "backlight disabled\n");
+
+ return 0;
+}
+
+static int tps65217_bl_update_status(struct backlight_device *bl)
+{
+ struct tps65217_bl *tps65217_bl = bl_get_data(bl);
+ int rc;
+ int brightness = bl->props.brightness;
+
+ if (bl->props.state & BL_CORE_SUSPENDED)
+ brightness = 0;
+
+ if ((bl->props.power != FB_BLANK_UNBLANK) ||
+ (bl->props.fb_blank != FB_BLANK_UNBLANK))
+ /* framebuffer in low power mode or blanking active */
+ brightness = 0;
+
+ if (brightness > 0) {
+ rc = tps65217_reg_write(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL2,
+ brightness - 1,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to set brightness level: %d\n", rc);
+ return rc;
+ }
+
+ dev_dbg(tps65217_bl->dev, "brightness set to %d\n", brightness);
+
+ if (!tps65217_bl->on)
+ rc = tps65217_bl_enable(tps65217_bl);
+ } else {
+ rc = tps65217_bl_disable(tps65217_bl);
+ }
+
+ return rc;
+}
+
+static int tps65217_bl_get_brightness(struct backlight_device *bl)
+{
+ return bl->props.brightness;
+}
+
+static const struct backlight_ops tps65217_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = tps65217_bl_update_status,
+ .get_brightness = tps65217_bl_get_brightness
+};
+
+static int tps65217_bl_hw_init(struct tps65217_bl *tps65217_bl, struct tps65217_bl_pdata *pdata)
+{
+ int rc;
+
+ rc = tps65217_bl_disable(tps65217_bl);
+ if (rc)
+ return rc;
+
+ if (pdata->isel == TPS65217_BL_ISET1) {
+ /* select ISET_1 current level */
+ rc = tps65217_clear_bits(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL1,
+ TPS65217_WLEDCTRL1_ISEL,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to select ISET1 current level: %d)\n", rc);
+ return rc;
+ }
+
+ dev_dbg(tps65217_bl->dev, "selected ISET1 current level\n");
+ } else {
+ /* select ISET2 current level */
+ rc = tps65217_set_bits(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL1,
+ TPS65217_WLEDCTRL1_ISEL,
+ TPS65217_WLEDCTRL1_ISEL,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to select ISET2 current level: %d\n", rc);
+ return rc;
+ }
+
+ dev_dbg(tps65217_bl->dev, "selected ISET2 current level\n");
+ }
+
+ /* set PWM frequency */
+ rc = tps65217_set_bits(tps65217_bl->tps,
+ TPS65217_REG_WLEDCTRL1,
+ TPS65217_WLEDCTRL1_FDIM_MASK,
+ pdata->fdim,
+ TPS65217_PROTECT_NONE);
+ if (rc) {
+ dev_err(tps65217_bl->dev,
+ "failed to select PWM dimming frequency: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int tps65217_bl_probe(struct platform_device *pdev)
+{
+ int rc;
+ struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
+ struct tps65217 *tps = i2c_get_clientdata(i2c_client);
+ struct tps65217_bl *tps65217_bl;
+ struct tps65217_bl_pdata *pdata;
+ struct backlight_properties bl_props;
+
+ tps65217_bl = kzalloc(GFP_KERNEL, sizeof(*tps65217_bl));
+ if (tps65217_bl == NULL) {
+ dev_err(&pdev->dev, "allocation of struct tps65217_bl failed\n");
+ return -ENOMEM;
+ }
+
+ tps65217_bl->tps = tps;
+ tps65217_bl->dev = &pdev->dev;
+ tps65217_bl->on = 0;
+
+ if (pdev->dev.platform_data)
+ pdata = pdev->dev.platform_data;
+ else
+ pdata = &tps65217_bl_default_pdata;
+
+ rc = tps65217_bl_hw_init(tps65217_bl, pdata);
+ if (rc)
+ goto err_bl_hw_init;
+
+ memset(&bl_props, 0, sizeof(struct backlight_properties));
+ bl_props.type = BACKLIGHT_RAW;
+ bl_props.max_brightness = 100;
+
+ tps65217_bl->bl = backlight_device_register(pdev->name,
+ tps65217_bl->dev,
+ tps65217_bl,
+ &tps65217_bl_ops,
+ &bl_props);
+ if (IS_ERR(tps65217_bl->bl)) {
+ rc = PTR_ERR(tps65217_bl->bl);
+ dev_err(tps65217_bl->dev, "registration of backlight device failed: %d\n", rc);
+ goto err_reg_bl;
+ }
+
+ tps65217_bl->bl->props.brightness = 0;
+
+ return 0;
+
+err_reg_bl:
+err_bl_hw_init:
+ kfree(tps65217_bl);
+
+ return rc;
+}
+
+static int tps65217_bl_remove(struct platform_device *pdev)
+{
+ struct tps65217_bl *tps65217_bl = (struct tps65217_bl *)platform_get_drvdata(pdev);
+
+ backlight_device_unregister(tps65217_bl->bl);
+
+ kfree(tps65217_bl);
+
+ return 0;
+}
+
+static struct platform_driver tps65217_bl_driver = {
+ .probe = tps65217_bl_probe,
+ .remove = tps65217_bl_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "tps65217-bl",
+ },
+};
+
+static int __init tps65217_bl_init(void)
+{
+ return platform_driver_register(&tps65217_bl_driver);
+}
+
+static void __exit tps65217_bl_exit(void)
+{
+ platform_driver_unregister(&tps65217_bl_driver);
+}
+
+module_init(tps65217_bl_init);
+module_exit(tps65217_bl_exit);
+
+MODULE_DESCRIPTION("TPS65217 Backlight driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Matthias Kaehlcke <matthias@xxxxxxxxxxxx>");
diff --git a/include/linux/mfd/tps65217.h b/include/linux/mfd/tps65217.h
index 12c0687..b08cf9b 100644
--- a/include/linux/mfd/tps65217.h
+++ b/include/linux/mfd/tps65217.h
@@ -210,6 +210,23 @@ enum tps65217_regulator_id {
/* Number of total regulators available */
#define TPS65217_NUM_REGULATOR (TPS65217_NUM_DCDC + TPS65217_NUM_LDO)
+enum tps65217_bl_isel {
+ TPS65217_BL_ISET1,
+ TPS65217_BL_ISET2,
+};
+
+enum tps65217_bl_fdim {
+ TPS65217_BL_FDIM_100HZ,
+ TPS65217_BL_FDIM_200HZ,
+ TPS65217_BL_FDIM_500HZ,
+ TPS65217_BL_FDIM_1000HZ,
+};
+
+struct tps65217_bl_pdata {
+ enum tps65217_bl_isel isel;
+ enum tps65217_bl_fdim fdim;
+};
+
/**
* struct tps65217_board - packages regulator init data
* @tps65217_regulator_data: regulator initialization values
@@ -219,6 +236,7 @@ enum tps65217_regulator_id {
struct tps65217_board {
struct regulator_init_data *tps65217_init_data[TPS65217_NUM_REGULATOR];
struct device_node *of_node[TPS65217_NUM_REGULATOR];
+ struct tps65217_bl_pdata *bl_pdata;
};
/**
@@ -255,6 +273,7 @@ struct tps65217 {
/* Client devices */
struct platform_device *regulator_pdev[TPS65217_NUM_REGULATOR];
+ struct platform_device *bl_pdev;
};
static inline struct tps65217 *dev_to_tps65217(struct device *dev)
--
1.7.10
--
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