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Message-ID: <1450210252-12121-1-git-send-email-afd@ti.com>
Date: Tue, 15 Dec 2015 14:10:52 -0600
From: "Andrew F. Davis" <afd@...com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>
CC: <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Andrew F. Davis" <afd@...com>
Subject: [PATCH] gpio: Add driver for TI TPIC2810
Add driver for TI TPIC2810 8-Bit LED Driver with I2C Interface.
The TPIC2810 has 8 open-drain outputs that can but used to drive
LEDs and other low-side switched resistive loads.
Signed-off-by: Andrew F. Davis <afd@...com>
---
drivers/gpio/Kconfig | 8 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-tpic2810.c | 165 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 174 insertions(+)
create mode 100644 drivers/gpio/gpio-tpic2810.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b60f40a..1696209 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -709,6 +709,14 @@ config GPIO_SX150X
8 bits: sx1508q
16 bits: sx1509q
+config GPIO_TPIC2810
+ tristate "TPIC2810 8-Bit I2C GPO expander"
+ help
+ Say yes here to enable the GPO driver for the TI TPIC2810 chip.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gpio-tpic2810.
+
endmenu
menu "MFD GPIO expanders"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 548e9b5..3bc66c6 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -96,6 +96,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
+obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
diff --git a/drivers/gpio/gpio-tpic2810.c b/drivers/gpio/gpio-tpic2810.c
new file mode 100644
index 0000000..2be828f
--- /dev/null
+++ b/drivers/gpio/gpio-tpic2810.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
+ * Andrew F. Davis <afd@...com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License version 2 for more details.
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+#define TPIC2810_WS_COMMAND 0x44
+
+/**
+ * struct tpic2810 - GPIO driver data
+ * @chip: GPIO controller chip
+ * @client: I2C device pointer
+ * @buffer: Buffer for device register
+ * @lock: Protects write sequences
+ */
+struct tpic2810 {
+ struct gpio_chip chip;
+ struct i2c_client *client;
+ u8 buffer;
+ struct mutex lock;
+};
+
+static inline struct tpic2810 *to_tpic2810(struct gpio_chip *chip)
+{
+ return container_of(chip, struct tpic2810, chip);
+}
+
+static int tpic2810_get_direction(struct gpio_chip *chip,
+ unsigned offset)
+{
+ /* This device always output */
+ return 0;
+}
+
+static int tpic2810_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ /* This device is output only */
+ return -EINVAL;
+}
+
+static int tpic2810_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ /* This device always output */
+ return 0;
+}
+
+static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct tpic2810 *gpio = to_tpic2810(chip);
+
+ mutex_lock(&gpio->lock);
+
+ if (value)
+ gpio->buffer |= BIT(offset);
+ else
+ gpio->buffer &= ~BIT(offset);
+
+ i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
+ gpio->buffer);
+
+ mutex_unlock(&gpio->lock);
+}
+
+static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct tpic2810 *gpio = to_tpic2810(chip);
+
+ mutex_lock(&gpio->lock);
+
+ /* clear bits under mask */
+ gpio->buffer &= ~(*mask);
+ /* set bits under mask */
+ gpio->buffer |= ((*mask) & (*bits));
+
+ i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
+ gpio->buffer);
+
+ mutex_unlock(&gpio->lock);
+}
+
+static struct gpio_chip template_chip = {
+ .label = "tpic2810",
+ .owner = THIS_MODULE,
+ .get_direction = tpic2810_get_direction,
+ .direction_input = tpic2810_direction_input,
+ .direction_output = tpic2810_direction_output,
+ .set = tpic2810_set,
+ .set_multiple = tpic2810_set_multiple,
+ .base = -1,
+ .ngpio = 8,
+ .can_sleep = true,
+};
+
+static int tpic2810_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tpic2810 *gpio;
+ int ret;
+
+ gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, gpio);
+
+ gpio->chip = template_chip;
+ gpio->chip.parent = &client->dev;
+
+ gpio->client = client;
+
+ mutex_init(&gpio->lock);
+
+ ret = gpiochip_add(&gpio->chip);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to register gpiochip\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tpic2810_remove(struct i2c_client *client)
+{
+ struct tpic2810 *gpio = i2c_get_clientdata(client);
+
+ gpiochip_remove(&gpio->chip);
+
+ return 0;
+}
+
+static const struct i2c_device_id tpic2810_id_table[] = {
+ { "tpic2810", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);
+
+static struct i2c_driver tpic2810_driver = {
+ .driver = {
+ .name = "tpic2810",
+ },
+ .probe = tpic2810_probe,
+ .remove = tpic2810_remove,
+ .id_table = tpic2810_id_table,
+};
+module_i2c_driver(tpic2810_driver);
+
+MODULE_AUTHOR("Andrew F. Davis <afd@...com>");
+MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
+MODULE_LICENSE("GPL v2");
--
2.6.4
--
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