diff options
Diffstat (limited to 'drivers/mfd/htc-pasic3.c')
| -rw-r--r-- | drivers/mfd/htc-pasic3.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/mfd/htc-pasic3.c b/drivers/mfd/htc-pasic3.c new file mode 100644 index 00000000000..af66f4f2830 --- /dev/null +++ b/drivers/mfd/htc-pasic3.c @@ -0,0 +1,265 @@ +/* + * 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/ds1wm.h> +#include <linux/gpio.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/mfd/htc-pasic3.h> + +#include <asm/arch/pxa-regs.h> + +struct pasic3_data { + void __iomem *mapping; + unsigned int bus_shift; + struct platform_device *ds1wm_pdev; + struct platform_device *led_pdev; +}; + +#define REG_ADDR 5 +#define REG_DATA 6 +#define NUM_REGS 7 + +#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->driver_data; + 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->driver_data; + 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 int led_device_add(struct device *pasic3_dev, + const struct pasic3_leds_machinfo *pdata) +{ + struct pasic3_data *asic = pasic3_dev->driver_data; + struct platform_device *pdev; + int ret; + + pdev = platform_device_alloc("pasic3-led", -1); + if (!pdev) { + dev_dbg(pasic3_dev, "failed to allocate LED platform device\n"); + return -ENOMEM; + } + + ret = platform_device_add_data(pdev, pdata, + sizeof(struct pasic3_leds_machinfo)); + if (ret < 0) { + dev_dbg(pasic3_dev, "failed to add LED platform data\n"); + goto exit_pdev_put; + } + + pdev->dev.parent = pasic3_dev; + ret = platform_device_add(pdev); + if (ret < 0) { + dev_dbg(pasic3_dev, "failed to add LED platform device\n"); + goto exit_pdev_put; + } + + asic->led_pdev = pdev; + return 0; + +exit_pdev_put: + platform_device_put(pdev); + return ret; +} + +/* + * DS1WM + */ + +static void 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); +} + +static void 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); +} + +static struct ds1wm_platform_data ds1wm_pdata = { + .bus_shift = 2, + .enable = ds1wm_enable, + .disable = ds1wm_disable, +}; + +static int ds1wm_device_add(struct device *pasic3_dev, int bus_shift) +{ + struct pasic3_data *asic = pasic3_dev->driver_data; + struct platform_device *pdev; + int ret; + + pdev = platform_device_alloc("ds1wm", -1); + if (!pdev) { + dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n"); + return -ENOMEM; + } + + ret = platform_device_add_resources(pdev, pdev->resource, + pdev->num_resources); + if (ret < 0) { + dev_dbg(pasic3_dev, "failed to add DS1WM resources\n"); + goto exit_pdev_put; + } + + ds1wm_pdata.bus_shift = asic->bus_shift; + ret = platform_device_add_data(pdev, &ds1wm_pdata, + sizeof(struct ds1wm_platform_data)); + if (ret < 0) { + dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n"); + goto exit_pdev_put; + } + + pdev->dev.parent = pasic3_dev; + ret = platform_device_add(pdev); + if (ret < 0) { + dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n"); + goto exit_pdev_put; + } + + asic->ds1wm_pdev = pdev; + return 0; + +exit_pdev_put: + platform_device_put(pdev); + return ret; +} + +static int __init pasic3_probe(struct platform_device *pdev) +{ + struct pasic3_platform_data *pdata = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + struct pasic3_data *asic; + struct resource *r; + int ret; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) + return -ENXIO; + + if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3")) + return -EBUSY; + + asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL); + if (!asic) + return -ENOMEM; + + platform_set_drvdata(pdev, asic); + + if (pdata && pdata->bus_shift) + asic->bus_shift = pdata->bus_shift; + else + asic->bus_shift = 2; + + asic->mapping = ioremap(r->start, r->end - r->start + 1); + if (!asic->mapping) { + dev_err(dev, "couldn't ioremap PASIC3\n"); + kfree(asic); + return -ENOMEM; + } + + ret = ds1wm_device_add(dev, asic->bus_shift); + if (ret < 0) + dev_warn(dev, "failed to register DS1WM\n"); + + if (pdata->led_pdata) { + ret = led_device_add(dev, pdata->led_pdata); + 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; + + if (asic->led_pdev) + platform_device_unregister(asic->led_pdev); + if (asic->ds1wm_pdev) + platform_device_unregister(asic->ds1wm_pdev); + + iounmap(asic->mapping); + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(r->start, r->end - r->start + 1); + kfree(asic); + return 0; +} + +static struct platform_driver pasic3_driver = { + .driver = { + .name = "pasic3", + }, + .remove = pasic3_remove, +}; + +static int __init pasic3_base_init(void) +{ + return platform_driver_probe(&pasic3_driver, pasic3_probe); +} + +static void __exit pasic3_base_exit(void) +{ + platform_driver_unregister(&pasic3_driver); +} + +module_init(pasic3_base_init); +module_exit(pasic3_base_exit); + +MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>"); +MODULE_DESCRIPTION("Core driver for HTC PASIC3"); +MODULE_LICENSE("GPL"); |