--- /dev/null
+/*
+ * Core driver for HTC PASIC3 LED/DS1WM chip.
+ *
+ * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
+ *
+ * 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 of the License.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/ds1wm.h>
+#include <linux/mfd/htc-pasic3.h>
+#include <linux/slab.h>
+
+struct pasic3_data {
+ void __iomem *mapping;
+ unsigned int bus_shift;
+};
+
+#define REG_ADDR 5
+#define REG_DATA 6
+
+#define READ_MODE 0x80
+
+/*
+ * write to a secondary register on the PASIC3
+ */
+void pasic3_write_register(struct device *dev, u32 reg, u8 val)
+{
+ struct pasic3_data *asic = dev_get_drvdata(dev);
+ int bus_shift = asic->bus_shift;
+ void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
+ void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
+
+ __raw_writeb(~READ_MODE & reg, addr);
+ __raw_writeb(val, data);
+}
+EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
+
+/*
+ * read from a secondary register on the PASIC3
+ */
+u8 pasic3_read_register(struct device *dev, u32 reg)
+{
+ struct pasic3_data *asic = dev_get_drvdata(dev);
+ int bus_shift = asic->bus_shift;
+ void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
+ void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
+
+ __raw_writeb(READ_MODE | reg, addr);
+ return __raw_readb(data);
+}
+EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
+
+/*
+ * LEDs
+ */
+
+static struct mfd_cell led_cell __initdata = {
+ .name = "leds-pasic3",
+};
+
+/*
+ * DS1WM
+ */
+
+static int ds1wm_enable(struct platform_device *pdev)
+{
+ struct device *dev = pdev->dev.parent;
+ int c;
+
+ c = pasic3_read_register(dev, 0x28);
+ pasic3_write_register(dev, 0x28, c & 0x7f);
+
+ dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
+ return 0;
+}
+
+static int ds1wm_disable(struct platform_device *pdev)
+{
+ struct device *dev = pdev->dev.parent;
+ int c;
+
+ c = pasic3_read_register(dev, 0x28);
+ pasic3_write_register(dev, 0x28, c | 0x80);
+
+ dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
+ return 0;
+}
+
+static struct ds1wm_driver_data ds1wm_pdata = {
+ .active_high = 0,
+ .reset_recover_delay = 1,
+};
+
+static struct resource ds1wm_resources[] __initdata = {
+ [0] = {
+ .start = 0,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static const struct mfd_cell ds1wm_cell __initconst = {
+ .name = "ds1wm",
+ .enable = ds1wm_enable,
+ .disable = ds1wm_disable,
+ .platform_data = &ds1wm_pdata,
+ .pdata_size = sizeof(ds1wm_pdata),
+ .num_resources = 2,
+ .resources = ds1wm_resources,
+};
+
+static int __init pasic3_probe(struct platform_device *pdev)
+{
+ struct pasic3_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device *dev = &pdev->dev;
+ struct pasic3_data *asic;
+ struct resource *r;
+ int ret;
+ int irq = 0;
+
+ r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (r) {
+ ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
+ (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
+ irq = r->start;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r)
+ return -ENXIO;
+
+ if (!request_mem_region(r->start, resource_size(r), "pasic3"))
+ return -EBUSY;
+
+ asic = devm_kzalloc(dev, sizeof(struct pasic3_data), GFP_KERNEL);
+ if (!asic)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, asic);
+
+ asic->mapping = ioremap(r->start, resource_size(r));
+ if (!asic->mapping) {
+ dev_err(dev, "couldn't ioremap PASIC3\n");
+ return -ENOMEM;
+ }
+
+ /* calculate bus shift from mem resource */
+ asic->bus_shift = (resource_size(r) - 5) >> 3;
+
+ if (pdata && pdata->clock_rate) {
+ ds1wm_pdata.clock_rate = pdata->clock_rate;
+ /* the first 5 PASIC3 registers control the DS1WM */
+ ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
+ ret = mfd_add_devices(&pdev->dev, pdev->id,
+ &ds1wm_cell, 1, r, irq, NULL);
+ if (ret < 0)
+ dev_warn(dev, "failed to register DS1WM\n");
+ }
+
+ if (pdata && pdata->led_pdata) {
+ led_cell.platform_data = pdata->led_pdata;
+ led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo);
+ ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r,
+ 0, NULL);
+ if (ret < 0)
+ dev_warn(dev, "failed to register LED device\n");
+ }
+
+ return 0;
+}
+
+static int pasic3_remove(struct platform_device *pdev)
+{
+ struct pasic3_data *asic = platform_get_drvdata(pdev);
+ struct resource *r;
+
+ mfd_remove_devices(&pdev->dev);
+
+ iounmap(asic->mapping);
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(r->start, resource_size(r));
+ return 0;
+}
+
+MODULE_ALIAS("platform:pasic3");
+
+static struct platform_driver pasic3_driver = {
+ .driver = {
+ .name = "pasic3",
+ },
+ .remove = pasic3_remove,
+};
+
+module_platform_driver_probe(pasic3_driver, pasic3_probe);
+
+MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
+MODULE_DESCRIPTION("Core driver for HTC PASIC3");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff