diff options
Diffstat (limited to 'kernel/drivers/mfd/mc13xxx-core.c')
| -rw-r--r-- | kernel/drivers/mfd/mc13xxx-core.c | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/kernel/drivers/mfd/mc13xxx-core.c b/kernel/drivers/mfd/mc13xxx-core.c new file mode 100644 index 000000000..25fd71164 --- /dev/null +++ b/kernel/drivers/mfd/mc13xxx-core.c @@ -0,0 +1,500 @@ +/* + * Copyright 2009-2010 Pengutronix + * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> + * + * loosely based on an earlier driver that has + * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.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 published by the + * Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/mfd/core.h> + +#include "mc13xxx.h" + +#define MC13XXX_IRQSTAT0 0 +#define MC13XXX_IRQMASK0 1 +#define MC13XXX_IRQSTAT1 3 +#define MC13XXX_IRQMASK1 4 + +#define MC13XXX_REVISION 7 +#define MC13XXX_REVISION_REVMETAL (0x07 << 0) +#define MC13XXX_REVISION_REVFULL (0x03 << 3) +#define MC13XXX_REVISION_ICID (0x07 << 6) +#define MC13XXX_REVISION_FIN (0x03 << 9) +#define MC13XXX_REVISION_FAB (0x03 << 11) +#define MC13XXX_REVISION_ICIDCODE (0x3f << 13) + +#define MC34708_REVISION_REVMETAL (0x07 << 0) +#define MC34708_REVISION_REVFULL (0x07 << 3) +#define MC34708_REVISION_FIN (0x07 << 6) +#define MC34708_REVISION_FAB (0x07 << 9) + +#define MC13XXX_PWRCTRL 15 +#define MC13XXX_PWRCTRL_WDIRESET (1 << 12) + +#define MC13XXX_ADC1 44 +#define MC13XXX_ADC1_ADEN (1 << 0) +#define MC13XXX_ADC1_RAND (1 << 1) +#define MC13XXX_ADC1_ADSEL (1 << 3) +#define MC13XXX_ADC1_ASC (1 << 20) +#define MC13XXX_ADC1_ADTRIGIGN (1 << 21) + +#define MC13XXX_ADC2 45 + +void mc13xxx_lock(struct mc13xxx *mc13xxx) +{ + if (!mutex_trylock(&mc13xxx->lock)) { + dev_dbg(mc13xxx->dev, "wait for %s from %ps\n", + __func__, __builtin_return_address(0)); + + mutex_lock(&mc13xxx->lock); + } + dev_dbg(mc13xxx->dev, "%s from %ps\n", + __func__, __builtin_return_address(0)); +} +EXPORT_SYMBOL(mc13xxx_lock); + +void mc13xxx_unlock(struct mc13xxx *mc13xxx) +{ + dev_dbg(mc13xxx->dev, "%s from %ps\n", + __func__, __builtin_return_address(0)); + mutex_unlock(&mc13xxx->lock); +} +EXPORT_SYMBOL(mc13xxx_unlock); + +int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val) +{ + int ret; + + ret = regmap_read(mc13xxx->regmap, offset, val); + dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val); + + return ret; +} +EXPORT_SYMBOL(mc13xxx_reg_read); + +int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val) +{ + dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val); + + if (val >= BIT(24)) + return -EINVAL; + + return regmap_write(mc13xxx->regmap, offset, val); +} +EXPORT_SYMBOL(mc13xxx_reg_write); + +int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset, + u32 mask, u32 val) +{ + BUG_ON(val & ~mask); + dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n", + offset, val, mask); + + return regmap_update_bits(mc13xxx->regmap, offset, mask, val); +} +EXPORT_SYMBOL(mc13xxx_reg_rmw); + +int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq) +{ + int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq); + + disable_irq_nosync(virq); + + return 0; +} +EXPORT_SYMBOL(mc13xxx_irq_mask); + +int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq) +{ + int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq); + + enable_irq(virq); + + return 0; +} +EXPORT_SYMBOL(mc13xxx_irq_unmask); + +int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq, + int *enabled, int *pending) +{ + int ret; + unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1; + unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1; + u32 irqbit = 1 << (irq < 24 ? irq : irq - 24); + + if (irq < 0 || irq >= ARRAY_SIZE(mc13xxx->irqs)) + return -EINVAL; + + if (enabled) { + u32 mask; + + ret = mc13xxx_reg_read(mc13xxx, offmask, &mask); + if (ret) + return ret; + + *enabled = mask & irqbit; + } + + if (pending) { + u32 stat; + + ret = mc13xxx_reg_read(mc13xxx, offstat, &stat); + if (ret) + return ret; + + *pending = stat & irqbit; + } + + return 0; +} +EXPORT_SYMBOL(mc13xxx_irq_status); + +int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq, + irq_handler_t handler, const char *name, void *dev) +{ + int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq); + + return devm_request_threaded_irq(mc13xxx->dev, virq, NULL, handler, + 0, name, dev); +} +EXPORT_SYMBOL(mc13xxx_irq_request); + +int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev) +{ + int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq); + + devm_free_irq(mc13xxx->dev, virq, dev); + + return 0; +} +EXPORT_SYMBOL(mc13xxx_irq_free); + +#define maskval(reg, mask) (((reg) & (mask)) >> __ffs(mask)) +static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision) +{ + dev_info(mc13xxx->dev, "%s: rev: %d.%d, " + "fin: %d, fab: %d, icid: %d/%d\n", + mc13xxx->variant->name, + maskval(revision, MC13XXX_REVISION_REVFULL), + maskval(revision, MC13XXX_REVISION_REVMETAL), + maskval(revision, MC13XXX_REVISION_FIN), + maskval(revision, MC13XXX_REVISION_FAB), + maskval(revision, MC13XXX_REVISION_ICID), + maskval(revision, MC13XXX_REVISION_ICIDCODE)); +} + +static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision) +{ + dev_info(mc13xxx->dev, "%s: rev %d.%d, fin: %d, fab: %d\n", + mc13xxx->variant->name, + maskval(revision, MC34708_REVISION_REVFULL), + maskval(revision, MC34708_REVISION_REVMETAL), + maskval(revision, MC34708_REVISION_FIN), + maskval(revision, MC34708_REVISION_FAB)); +} + +/* These are only exported for mc13xxx-i2c and mc13xxx-spi */ +struct mc13xxx_variant mc13xxx_variant_mc13783 = { + .name = "mc13783", + .print_revision = mc13xxx_print_revision, +}; +EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783); + +struct mc13xxx_variant mc13xxx_variant_mc13892 = { + .name = "mc13892", + .print_revision = mc13xxx_print_revision, +}; +EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892); + +struct mc13xxx_variant mc13xxx_variant_mc34708 = { + .name = "mc34708", + .print_revision = mc34708_print_revision, +}; +EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708); + +static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx) +{ + return mc13xxx->variant->name; +} + +int mc13xxx_get_flags(struct mc13xxx *mc13xxx) +{ + return mc13xxx->flags; +} +EXPORT_SYMBOL(mc13xxx_get_flags); + +#define MC13XXX_ADC1_CHAN0_SHIFT 5 +#define MC13XXX_ADC1_CHAN1_SHIFT 8 +#define MC13783_ADC1_ATO_SHIFT 11 +#define MC13783_ADC1_ATOX (1 << 19) + +struct mc13xxx_adcdone_data { + struct mc13xxx *mc13xxx; + struct completion done; +}; + +static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data) +{ + struct mc13xxx_adcdone_data *adcdone_data = data; + + complete_all(&adcdone_data->done); + + return IRQ_HANDLED; +} + +#define MC13XXX_ADC_WORKING (1 << 0) + +int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode, + unsigned int channel, u8 ato, bool atox, + unsigned int *sample) +{ + u32 adc0, adc1, old_adc0; + int i, ret; + struct mc13xxx_adcdone_data adcdone_data = { + .mc13xxx = mc13xxx, + }; + init_completion(&adcdone_data.done); + + dev_dbg(mc13xxx->dev, "%s\n", __func__); + + mc13xxx_lock(mc13xxx); + + if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) { + ret = -EBUSY; + goto out; + } + + mc13xxx->adcflags |= MC13XXX_ADC_WORKING; + + mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0); + + adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2; + adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC; + + if (channel > 7) + adc1 |= MC13XXX_ADC1_ADSEL; + + switch (mode) { + case MC13XXX_ADC_MODE_TS: + adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 | + MC13XXX_ADC0_TSMOD1; + adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT; + break; + + case MC13XXX_ADC_MODE_SINGLE_CHAN: + adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK; + adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT; + adc1 |= MC13XXX_ADC1_RAND; + break; + + case MC13XXX_ADC_MODE_MULT_CHAN: + adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK; + adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT; + break; + + default: + mc13xxx_unlock(mc13xxx); + return -EINVAL; + } + + adc1 |= ato << MC13783_ADC1_ATO_SHIFT; + if (atox) + adc1 |= MC13783_ADC1_ATOX; + + dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__); + mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE, + mc13xxx_handler_adcdone, __func__, &adcdone_data); + + mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0); + mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1); + + mc13xxx_unlock(mc13xxx); + + ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ); + + if (!ret) + ret = -ETIMEDOUT; + + mc13xxx_lock(mc13xxx); + + mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data); + + if (ret > 0) + for (i = 0; i < 4; ++i) { + ret = mc13xxx_reg_read(mc13xxx, + MC13XXX_ADC2, &sample[i]); + if (ret) + break; + } + + if (mode == MC13XXX_ADC_MODE_TS) + /* restore TSMOD */ + mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0); + + mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING; +out: + mc13xxx_unlock(mc13xxx); + + return ret; +} +EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion); + +static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx, + const char *format, void *pdata, size_t pdata_size) +{ + char buf[30]; + const char *name = mc13xxx_get_chipname(mc13xxx); + + struct mfd_cell cell = { + .platform_data = pdata, + .pdata_size = pdata_size, + }; + + /* there is no asnprintf in the kernel :-( */ + if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf)) + return -E2BIG; + + cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL); + if (!cell.name) + return -ENOMEM; + + return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0, + regmap_irq_get_domain(mc13xxx->irq_data)); +} + +static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format) +{ + return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0); +} + +#ifdef CONFIG_OF +static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx) +{ + struct device_node *np = mc13xxx->dev->of_node; + + if (!np) + return -ENODEV; + + if (of_get_property(np, "fsl,mc13xxx-uses-adc", NULL)) + mc13xxx->flags |= MC13XXX_USE_ADC; + + if (of_get_property(np, "fsl,mc13xxx-uses-codec", NULL)) + mc13xxx->flags |= MC13XXX_USE_CODEC; + + if (of_get_property(np, "fsl,mc13xxx-uses-rtc", NULL)) + mc13xxx->flags |= MC13XXX_USE_RTC; + + if (of_get_property(np, "fsl,mc13xxx-uses-touch", NULL)) + mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN; + + return 0; +} +#else +static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx) +{ + return -ENODEV; +} +#endif + +int mc13xxx_common_init(struct device *dev) +{ + struct mc13xxx_platform_data *pdata = dev_get_platdata(dev); + struct mc13xxx *mc13xxx = dev_get_drvdata(dev); + u32 revision; + int i, ret; + + mc13xxx->dev = dev; + + ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision); + if (ret) + return ret; + + mc13xxx->variant->print_revision(mc13xxx, revision); + + ret = mc13xxx_reg_rmw(mc13xxx, MC13XXX_PWRCTRL, + MC13XXX_PWRCTRL_WDIRESET, MC13XXX_PWRCTRL_WDIRESET); + if (ret) + return ret; + + for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) { + mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG; + mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG); + } + + mc13xxx->irq_chip.name = dev_name(dev); + mc13xxx->irq_chip.status_base = MC13XXX_IRQSTAT0; + mc13xxx->irq_chip.mask_base = MC13XXX_IRQMASK0; + mc13xxx->irq_chip.ack_base = MC13XXX_IRQSTAT0; + mc13xxx->irq_chip.irq_reg_stride = MC13XXX_IRQSTAT1 - MC13XXX_IRQSTAT0; + mc13xxx->irq_chip.init_ack_masked = true; + mc13xxx->irq_chip.use_ack = true; + mc13xxx->irq_chip.num_regs = MC13XXX_IRQ_REG_CNT; + mc13xxx->irq_chip.irqs = mc13xxx->irqs; + mc13xxx->irq_chip.num_irqs = ARRAY_SIZE(mc13xxx->irqs); + + ret = regmap_add_irq_chip(mc13xxx->regmap, mc13xxx->irq, IRQF_ONESHOT, + 0, &mc13xxx->irq_chip, &mc13xxx->irq_data); + if (ret) + return ret; + + mutex_init(&mc13xxx->lock); + + if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata) + mc13xxx->flags = pdata->flags; + + if (pdata) { + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator", + &pdata->regulators, sizeof(pdata->regulators)); + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led", + pdata->leds, sizeof(*pdata->leds)); + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton", + pdata->buttons, sizeof(*pdata->buttons)); + if (mc13xxx->flags & MC13XXX_USE_CODEC) + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-codec", + pdata->codec, sizeof(*pdata->codec)); + if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN) + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts", + &pdata->touch, sizeof(pdata->touch)); + } else { + mc13xxx_add_subdevice(mc13xxx, "%s-regulator"); + mc13xxx_add_subdevice(mc13xxx, "%s-led"); + mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton"); + if (mc13xxx->flags & MC13XXX_USE_CODEC) + mc13xxx_add_subdevice(mc13xxx, "%s-codec"); + if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN) + mc13xxx_add_subdevice(mc13xxx, "%s-ts"); + } + + if (mc13xxx->flags & MC13XXX_USE_ADC) + mc13xxx_add_subdevice(mc13xxx, "%s-adc"); + + if (mc13xxx->flags & MC13XXX_USE_RTC) + mc13xxx_add_subdevice(mc13xxx, "%s-rtc"); + + return 0; +} +EXPORT_SYMBOL_GPL(mc13xxx_common_init); + +int mc13xxx_common_exit(struct device *dev) +{ + struct mc13xxx *mc13xxx = dev_get_drvdata(dev); + + mfd_remove_devices(dev); + regmap_del_irq_chip(mc13xxx->irq, mc13xxx->irq_data); + mutex_destroy(&mc13xxx->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(mc13xxx_common_exit); + +MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC"); +MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>"); +MODULE_LICENSE("GPL v2"); |