From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 drivers/misc/lis3lv02d/lis3lv02d_spi.c | 154 +++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 drivers/misc/lis3lv02d/lis3lv02d_spi.c

(limited to 'drivers/misc/lis3lv02d/lis3lv02d_spi.c')

diff --git a/drivers/misc/lis3lv02d/lis3lv02d_spi.c b/drivers/misc/lis3lv02d/lis3lv02d_spi.c
new file mode 100644
index 000000000..b2f6e1651
--- /dev/null
+++ b/drivers/misc/lis3lv02d/lis3lv02d_spi.c
@@ -0,0 +1,154 @@
+/*
+ * lis3lv02d_spi - SPI glue layer for lis3lv02d
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ *  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
+ *  publishhed by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/spi/spi.h>
+#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+
+#include "lis3lv02d.h"
+
+#define DRV_NAME 	"lis3lv02d_spi"
+#define LIS3_SPI_READ	0x80
+
+static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
+{
+	struct spi_device *spi = lis3->bus_priv;
+	int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
+	if (ret < 0)
+		return -EINVAL;
+
+	*v = (u8) ret;
+	return 0;
+}
+
+static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
+{
+	u8 tmp[2] = { reg, val };
+	struct spi_device *spi = lis3->bus_priv;
+	return spi_write(spi, tmp, sizeof(tmp));
+}
+
+static int lis3_spi_init(struct lis3lv02d *lis3)
+{
+	u8 reg;
+	int ret;
+
+	/* power up the device */
+	ret = lis3->read(lis3, CTRL_REG1, &reg);
+	if (ret < 0)
+		return ret;
+
+	reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
+	return lis3->write(lis3, CTRL_REG1, reg);
+}
+
+static union axis_conversion lis3lv02d_axis_normal =
+	{ .as_array = { 1, 2, 3 } };
+
+#ifdef CONFIG_OF
+static const struct of_device_id lis302dl_spi_dt_ids[] = {
+	{ .compatible = "st,lis302dl-spi" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
+#endif
+
+static int lis302dl_spi_probe(struct spi_device *spi)
+{
+	int ret;
+
+	spi->bits_per_word = 8;
+	spi->mode = SPI_MODE_0;
+	ret = spi_setup(spi);
+	if (ret < 0)
+		return ret;
+
+	lis3_dev.bus_priv	= spi;
+	lis3_dev.init		= lis3_spi_init;
+	lis3_dev.read		= lis3_spi_read;
+	lis3_dev.write		= lis3_spi_write;
+	lis3_dev.irq		= spi->irq;
+	lis3_dev.ac		= lis3lv02d_axis_normal;
+	lis3_dev.pdata		= spi->dev.platform_data;
+
+#ifdef CONFIG_OF
+	if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
+		lis3_dev.of_node = spi->dev.of_node;
+		ret = lis3lv02d_init_dt(&lis3_dev);
+		if (ret)
+			return ret;
+	}
+#endif
+	spi_set_drvdata(spi, &lis3_dev);
+
+	return lis3lv02d_init_device(&lis3_dev);
+}
+
+static int lis302dl_spi_remove(struct spi_device *spi)
+{
+	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
+	lis3lv02d_joystick_disable(lis3);
+	lis3lv02d_poweroff(lis3);
+
+	return lis3lv02d_remove_fs(&lis3_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int lis3lv02d_spi_suspend(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
+
+	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
+		lis3lv02d_poweroff(&lis3_dev);
+
+	return 0;
+}
+
+static int lis3lv02d_spi_resume(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
+
+	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
+		lis3lv02d_poweron(lis3);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
+			 lis3lv02d_spi_resume);
+
+static struct spi_driver lis302dl_spi_driver = {
+	.driver	 = {
+		.name   = DRV_NAME,
+		.owner  = THIS_MODULE,
+		.pm	= &lis3lv02d_spi_pm,
+		.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
+	},
+	.probe	= lis302dl_spi_probe,
+	.remove	= lis302dl_spi_remove,
+};
+
+module_spi_driver(lis302dl_spi_driver);
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:" DRV_NAME);
-- 
cgit v1.2.3-54-g00ecf