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path: root/drivers/mfd/tps6105x.c
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Diffstat (limited to 'drivers/mfd/tps6105x.c')
-rw-r--r--drivers/mfd/tps6105x.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
new file mode 100644
index 0000000000..5601f6d0d8
--- /dev/null
+++ b/drivers/mfd/tps6105x.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Core driver for TPS61050/61052 boost converters, used for while LED
+ * driving, audio power amplification, white LED flash, and generic
+ * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
+ * and a flash synchronization pin to synchronize flash events when used as
+ * flashgun.
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/gpio.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps6105x.h>
+
+static struct regmap_config tps6105x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = TPS6105X_REG_3,
+};
+
+static int tps6105x_startup(struct tps6105x *tps6105x)
+{
+ int ret;
+ unsigned int regval;
+
+ ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
+ if (ret)
+ return ret;
+ switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
+ case TPS6105X_REG0_MODE_SHUTDOWN:
+ dev_info(&tps6105x->client->dev,
+ "TPS6105x found in SHUTDOWN mode\n");
+ break;
+ case TPS6105X_REG0_MODE_TORCH:
+ dev_info(&tps6105x->client->dev,
+ "TPS6105x found in TORCH mode\n");
+ break;
+ case TPS6105X_REG0_MODE_TORCH_FLASH:
+ dev_info(&tps6105x->client->dev,
+ "TPS6105x found in FLASH mode\n");
+ break;
+ case TPS6105X_REG0_MODE_VOLTAGE:
+ dev_info(&tps6105x->client->dev,
+ "TPS6105x found in VOLTAGE mode\n");
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * MFD cells - we always have a GPIO cell and we have one cell
+ * which is selected operation mode.
+ */
+static struct mfd_cell tps6105x_gpio_cell = {
+ .name = "tps6105x-gpio",
+};
+
+static struct mfd_cell tps6105x_leds_cell = {
+ .name = "tps6105x-leds",
+};
+
+static struct mfd_cell tps6105x_flash_cell = {
+ .name = "tps6105x-flash",
+};
+
+static struct mfd_cell tps6105x_regulator_cell = {
+ .name = "tps6105x-regulator",
+};
+
+static int tps6105x_add_device(struct tps6105x *tps6105x,
+ struct mfd_cell *cell)
+{
+ cell->platform_data = tps6105x;
+ cell->pdata_size = sizeof(*tps6105x);
+
+ return mfd_add_devices(&tps6105x->client->dev,
+ PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
+}
+
+static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct tps6105x_platform_data *pdata;
+ struct device_node *child;
+
+ if (!np)
+ return ERR_PTR(-EINVAL);
+ if (of_get_available_child_count(np) > 1) {
+ dev_err(dev, "cannot support multiple operational modes");
+ return ERR_PTR(-EINVAL);
+ }
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+ pdata->mode = TPS6105X_MODE_SHUTDOWN;
+ for_each_available_child_of_node(np, child) {
+ if (child->name && !of_node_cmp(child->name, "regulator"))
+ pdata->mode = TPS6105X_MODE_VOLTAGE;
+ else if (child->name && !of_node_cmp(child->name, "led"))
+ pdata->mode = TPS6105X_MODE_TORCH;
+ }
+
+ return pdata;
+}
+
+static int tps6105x_probe(struct i2c_client *client)
+{
+ struct tps6105x *tps6105x;
+ struct tps6105x_platform_data *pdata;
+ int ret;
+
+ pdata = dev_get_platdata(&client->dev);
+ if (!pdata)
+ pdata = tps6105x_parse_dt(&client->dev);
+ if (IS_ERR(pdata)) {
+ dev_err(&client->dev, "No platform data or DT found");
+ return PTR_ERR(pdata);
+ }
+
+ tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
+ if (!tps6105x)
+ return -ENOMEM;
+
+ tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
+ if (IS_ERR(tps6105x->regmap))
+ return PTR_ERR(tps6105x->regmap);
+
+ i2c_set_clientdata(client, tps6105x);
+ tps6105x->client = client;
+ tps6105x->pdata = pdata;
+
+ ret = tps6105x_startup(tps6105x);
+ if (ret) {
+ dev_err(&client->dev, "chip initialization failed\n");
+ return ret;
+ }
+
+ ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
+ if (ret)
+ return ret;
+
+ switch (pdata->mode) {
+ case TPS6105X_MODE_SHUTDOWN:
+ dev_info(&client->dev,
+ "present, not used for anything, only GPIO\n");
+ break;
+ case TPS6105X_MODE_TORCH:
+ ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
+ break;
+ case TPS6105X_MODE_TORCH_FLASH:
+ ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
+ break;
+ case TPS6105X_MODE_VOLTAGE:
+ ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
+ break;
+ default:
+ dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
+ break;
+ }
+
+ if (ret)
+ mfd_remove_devices(&client->dev);
+
+ return ret;
+}
+
+static void tps6105x_remove(struct i2c_client *client)
+{
+ struct tps6105x *tps6105x = i2c_get_clientdata(client);
+
+ mfd_remove_devices(&client->dev);
+
+ /* Put chip in shutdown mode */
+ regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
+ TPS6105X_REG0_MODE_MASK,
+ TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
+}
+
+static const struct i2c_device_id tps6105x_id[] = {
+ { "tps61050", 0 },
+ { "tps61052", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tps6105x_id);
+
+static const struct of_device_id tps6105x_of_match[] = {
+ { .compatible = "ti,tps61050" },
+ { .compatible = "ti,tps61052" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tps6105x_of_match);
+
+static struct i2c_driver tps6105x_driver = {
+ .driver = {
+ .name = "tps6105x",
+ .of_match_table = tps6105x_of_match,
+ },
+ .probe = tps6105x_probe,
+ .remove = tps6105x_remove,
+ .id_table = tps6105x_id,
+};
+
+static int __init tps6105x_init(void)
+{
+ return i2c_add_driver(&tps6105x_driver);
+}
+subsys_initcall(tps6105x_init);
+
+static void __exit tps6105x_exit(void)
+{
+ i2c_del_driver(&tps6105x_driver);
+}
+module_exit(tps6105x_exit);
+
+MODULE_AUTHOR("Linus Walleij");
+MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
+MODULE_LICENSE("GPL v2");