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210 lines
4.9 KiB
210 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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/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/core.h> |
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#include <linux/mfd/ds1wm.h> |
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#include <linux/mfd/htc-pasic3.h> |
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#include <linux/slab.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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}; |
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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_get_drvdata(dev); |
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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_get_drvdata(dev); |
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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 struct mfd_cell led_cell __initdata = { |
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.name = "leds-pasic3", |
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}; |
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/* |
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* DS1WM |
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*/ |
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static int 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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return 0; |
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} |
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static int 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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return 0; |
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} |
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static struct ds1wm_driver_data ds1wm_pdata = { |
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.active_high = 0, |
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.reset_recover_delay = 1, |
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}; |
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static struct resource ds1wm_resources[] __initdata = { |
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[0] = { |
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.start = 0, |
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.flags = IORESOURCE_MEM, |
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}, |
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[1] = { |
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.start = 0, |
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.end = 0, |
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.flags = IORESOURCE_IRQ, |
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}, |
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}; |
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static const struct mfd_cell ds1wm_cell __initconst = { |
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.name = "ds1wm", |
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.enable = ds1wm_enable, |
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.disable = ds1wm_disable, |
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.platform_data = &ds1wm_pdata, |
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.pdata_size = sizeof(ds1wm_pdata), |
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.num_resources = 2, |
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.resources = ds1wm_resources, |
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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 = dev_get_platdata(&pdev->dev); |
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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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int irq = 0; |
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
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if (r) { |
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ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags & |
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(IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE)); |
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irq = r->start; |
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} |
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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, resource_size(r), "pasic3")) |
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return -EBUSY; |
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asic = devm_kzalloc(dev, 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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asic->mapping = ioremap(r->start, resource_size(r)); |
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if (!asic->mapping) { |
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dev_err(dev, "couldn't ioremap PASIC3\n"); |
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return -ENOMEM; |
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} |
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/* calculate bus shift from mem resource */ |
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asic->bus_shift = (resource_size(r) - 5) >> 3; |
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if (pdata && pdata->clock_rate) { |
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ds1wm_pdata.clock_rate = pdata->clock_rate; |
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/* the first 5 PASIC3 registers control the DS1WM */ |
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ds1wm_resources[0].end = (5 << asic->bus_shift) - 1; |
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ret = mfd_add_devices(&pdev->dev, pdev->id, |
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&ds1wm_cell, 1, r, irq, NULL); |
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if (ret < 0) |
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dev_warn(dev, "failed to register DS1WM\n"); |
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} |
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if (pdata && pdata->led_pdata) { |
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led_cell.platform_data = pdata->led_pdata; |
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led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo); |
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ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, |
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0, NULL); |
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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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mfd_remove_devices(&pdev->dev); |
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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, resource_size(r)); |
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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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module_platform_driver_probe(pasic3_driver, pasic3_probe); |
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MODULE_AUTHOR("Philipp Zabel <[email protected]>"); |
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MODULE_DESCRIPTION("Core driver for HTC PASIC3"); |
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MODULE_LICENSE("GPL");
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