266 lines
6.1 KiB
C
266 lines
6.1 KiB
C
/*
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* Core driver for HTC PASIC3 LED/DS1WM chip.
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*
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* Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/ds1wm.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/htc-pasic3.h>
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struct pasic3_data {
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void __iomem *mapping;
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unsigned int bus_shift;
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struct platform_device *ds1wm_pdev;
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struct platform_device *led_pdev;
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};
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#define REG_ADDR 5
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#define REG_DATA 6
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#define READ_MODE 0x80
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/*
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* write to a secondary register on the PASIC3
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*/
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void pasic3_write_register(struct device *dev, u32 reg, u8 val)
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{
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struct pasic3_data *asic = dev->driver_data;
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int bus_shift = asic->bus_shift;
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void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
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void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
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__raw_writeb(~READ_MODE & reg, addr);
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__raw_writeb(val, data);
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}
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EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
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/*
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* read from a secondary register on the PASIC3
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*/
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u8 pasic3_read_register(struct device *dev, u32 reg)
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{
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struct pasic3_data *asic = dev->driver_data;
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int bus_shift = asic->bus_shift;
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void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
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void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
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__raw_writeb(READ_MODE | reg, addr);
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return __raw_readb(data);
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}
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EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
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/*
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* LEDs
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*/
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static int led_device_add(struct device *pasic3_dev,
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const struct pasic3_leds_machinfo *pdata)
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{
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struct pasic3_data *asic = pasic3_dev->driver_data;
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struct platform_device *pdev;
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int ret;
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pdev = platform_device_alloc("pasic3-led", -1);
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if (!pdev) {
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dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
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return -ENOMEM;
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}
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ret = platform_device_add_data(pdev, pdata,
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sizeof(struct pasic3_leds_machinfo));
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if (ret < 0) {
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dev_dbg(pasic3_dev, "failed to add LED platform data\n");
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goto exit_pdev_put;
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}
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pdev->dev.parent = pasic3_dev;
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ret = platform_device_add(pdev);
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if (ret < 0) {
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dev_dbg(pasic3_dev, "failed to add LED platform device\n");
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goto exit_pdev_put;
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}
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asic->led_pdev = pdev;
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return 0;
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exit_pdev_put:
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platform_device_put(pdev);
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return ret;
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}
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/*
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* DS1WM
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*/
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static void ds1wm_enable(struct platform_device *pdev)
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{
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struct device *dev = pdev->dev.parent;
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int c;
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c = pasic3_read_register(dev, 0x28);
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pasic3_write_register(dev, 0x28, c & 0x7f);
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dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
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}
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static void ds1wm_disable(struct platform_device *pdev)
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{
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struct device *dev = pdev->dev.parent;
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int c;
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c = pasic3_read_register(dev, 0x28);
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pasic3_write_register(dev, 0x28, c | 0x80);
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dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
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}
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static struct ds1wm_platform_data ds1wm_pdata = {
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.bus_shift = 2,
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.enable = ds1wm_enable,
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.disable = ds1wm_disable,
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};
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static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift)
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{
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struct device *pasic3_dev = &pasic3_pdev->dev;
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struct pasic3_data *asic = pasic3_dev->driver_data;
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struct platform_device *pdev;
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int ret;
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pdev = platform_device_alloc("ds1wm", -1);
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if (!pdev) {
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dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
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return -ENOMEM;
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}
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ret = platform_device_add_resources(pdev, pasic3_pdev->resource,
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pasic3_pdev->num_resources);
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if (ret < 0) {
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dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
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goto exit_pdev_put;
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}
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ds1wm_pdata.bus_shift = asic->bus_shift;
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ret = platform_device_add_data(pdev, &ds1wm_pdata,
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sizeof(struct ds1wm_platform_data));
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if (ret < 0) {
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dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
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goto exit_pdev_put;
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}
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pdev->dev.parent = pasic3_dev;
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ret = platform_device_add(pdev);
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if (ret < 0) {
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dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
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goto exit_pdev_put;
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}
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asic->ds1wm_pdev = pdev;
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return 0;
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exit_pdev_put:
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platform_device_put(pdev);
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return ret;
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}
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static int __init pasic3_probe(struct platform_device *pdev)
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{
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struct pasic3_platform_data *pdata = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct pasic3_data *asic;
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struct resource *r;
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int ret;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r)
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return -ENXIO;
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if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
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return -EBUSY;
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asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
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if (!asic)
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return -ENOMEM;
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platform_set_drvdata(pdev, asic);
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if (pdata && pdata->bus_shift)
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asic->bus_shift = pdata->bus_shift;
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else
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asic->bus_shift = 2;
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asic->mapping = ioremap(r->start, r->end - r->start + 1);
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if (!asic->mapping) {
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dev_err(dev, "couldn't ioremap PASIC3\n");
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kfree(asic);
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return -ENOMEM;
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}
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ret = ds1wm_device_add(pdev, asic->bus_shift);
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if (ret < 0)
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dev_warn(dev, "failed to register DS1WM\n");
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if (pdata->led_pdata) {
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ret = led_device_add(dev, pdata->led_pdata);
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if (ret < 0)
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dev_warn(dev, "failed to register LED device\n");
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}
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return 0;
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}
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static int pasic3_remove(struct platform_device *pdev)
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{
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struct pasic3_data *asic = platform_get_drvdata(pdev);
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struct resource *r;
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if (asic->led_pdev)
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platform_device_unregister(asic->led_pdev);
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if (asic->ds1wm_pdev)
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platform_device_unregister(asic->ds1wm_pdev);
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iounmap(asic->mapping);
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(r->start, r->end - r->start + 1);
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kfree(asic);
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return 0;
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}
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MODULE_ALIAS("platform:pasic3");
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static struct platform_driver pasic3_driver = {
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.driver = {
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.name = "pasic3",
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},
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.remove = pasic3_remove,
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};
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static int __init pasic3_base_init(void)
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{
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return platform_driver_probe(&pasic3_driver, pasic3_probe);
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}
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static void __exit pasic3_base_exit(void)
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{
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platform_driver_unregister(&pasic3_driver);
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}
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module_init(pasic3_base_init);
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module_exit(pasic3_base_exit);
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MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
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MODULE_DESCRIPTION("Core driver for HTC PASIC3");
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MODULE_LICENSE("GPL");
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