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8238addcc5
This driver provides the core Freescale MC13783 support. It registers the client platform_devices and provides access to the A/D converter. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
427 lines
11 KiB
C
427 lines
11 KiB
C
/*
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* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is in parts based on wm8350-core.c and pcf50633-core.c
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*
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* Initial development of this code was funded by
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* Phytec Messtechnik GmbH, http://www.phytec.de
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/mfd/mc13783-private.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/mc13783.h>
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#include <linux/completion.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/spi/spi.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#define MC13783_MAX_REG_NUM 0x3f
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#define MC13783_FRAME_MASK 0x00ffffff
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#define MC13783_MAX_REG_NUM 0x3f
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#define MC13783_REG_NUM_SHIFT 0x19
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#define MC13783_WRITE_BIT_SHIFT 31
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static inline int spi_rw(struct spi_device *spi, u8 * buf, size_t len)
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{
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struct spi_transfer t = {
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.tx_buf = (const void *)buf,
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.rx_buf = buf,
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.len = len,
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.cs_change = 0,
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.delay_usecs = 0,
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};
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struct spi_message m;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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if (spi_sync(spi, &m) != 0 || m.status != 0)
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return -EINVAL;
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return len - m.actual_length;
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}
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static int mc13783_read(struct mc13783 *mc13783, int reg_num, u32 *reg_val)
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{
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unsigned int frame = 0;
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int ret = 0;
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if (reg_num > MC13783_MAX_REG_NUM)
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return -EINVAL;
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frame |= reg_num << MC13783_REG_NUM_SHIFT;
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ret = spi_rw(mc13783->spi_device, (u8 *)&frame, 4);
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*reg_val = frame & MC13783_FRAME_MASK;
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return ret;
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}
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static int mc13783_write(struct mc13783 *mc13783, int reg_num, u32 reg_val)
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{
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unsigned int frame = 0;
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if (reg_num > MC13783_MAX_REG_NUM)
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return -EINVAL;
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frame |= (1 << MC13783_WRITE_BIT_SHIFT);
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frame |= reg_num << MC13783_REG_NUM_SHIFT;
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frame |= reg_val & MC13783_FRAME_MASK;
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return spi_rw(mc13783->spi_device, (u8 *)&frame, 4);
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}
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int mc13783_reg_read(struct mc13783 *mc13783, int reg_num, u32 *reg_val)
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{
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int ret;
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mutex_lock(&mc13783->io_lock);
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ret = mc13783_read(mc13783, reg_num, reg_val);
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mutex_unlock(&mc13783->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(mc13783_reg_read);
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int mc13783_reg_write(struct mc13783 *mc13783, int reg_num, u32 reg_val)
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{
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int ret;
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mutex_lock(&mc13783->io_lock);
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ret = mc13783_write(mc13783, reg_num, reg_val);
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mutex_unlock(&mc13783->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(mc13783_reg_write);
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/**
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* mc13783_set_bits - Bitmask write
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*
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* @mc13783: Pointer to mc13783 control structure
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* @reg: Register to access
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* @mask: Mask of bits to change
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* @val: Value to set for masked bits
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*/
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int mc13783_set_bits(struct mc13783 *mc13783, int reg, u32 mask, u32 val)
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{
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u32 tmp;
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int ret;
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mutex_lock(&mc13783->io_lock);
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ret = mc13783_read(mc13783, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (ret == 0)
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ret = mc13783_write(mc13783, reg, tmp);
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mutex_unlock(&mc13783->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(mc13783_set_bits);
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int mc13783_register_irq(struct mc13783 *mc13783, int irq,
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void (*handler) (int, void *), void *data)
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{
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if (irq < 0 || irq > MC13783_NUM_IRQ || !handler)
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return -EINVAL;
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if (WARN_ON(mc13783->irq_handler[irq].handler))
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return -EBUSY;
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mutex_lock(&mc13783->io_lock);
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mc13783->irq_handler[irq].handler = handler;
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mc13783->irq_handler[irq].data = data;
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mutex_unlock(&mc13783->io_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mc13783_register_irq);
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int mc13783_free_irq(struct mc13783 *mc13783, int irq)
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{
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if (irq < 0 || irq > MC13783_NUM_IRQ)
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return -EINVAL;
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mutex_lock(&mc13783->io_lock);
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mc13783->irq_handler[irq].handler = NULL;
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mutex_unlock(&mc13783->io_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mc13783_free_irq);
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static void mc13783_irq_work(struct work_struct *work)
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{
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struct mc13783 *mc13783 = container_of(work, struct mc13783, work);
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int i;
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unsigned int adc_sts;
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/* check if the adc has finished any completion */
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mc13783_reg_read(mc13783, MC13783_REG_INTERRUPT_STATUS_0, &adc_sts);
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mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_0,
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adc_sts & MC13783_INT_STAT_ADCDONEI);
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if (adc_sts & MC13783_INT_STAT_ADCDONEI)
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complete_all(&mc13783->adc_done);
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for (i = 0; i < MC13783_NUM_IRQ; i++)
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if (mc13783->irq_handler[i].handler)
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mc13783->irq_handler[i].handler(i,
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mc13783->irq_handler[i].data);
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enable_irq(mc13783->irq);
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}
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static irqreturn_t mc13783_interrupt(int irq, void *dev_id)
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{
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struct mc13783 *mc13783 = dev_id;
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disable_irq_nosync(irq);
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schedule_work(&mc13783->work);
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return IRQ_HANDLED;
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}
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/* set adc to ts interrupt mode, which generates touchscreen wakeup interrupt */
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static inline void mc13783_adc_set_ts_irq_mode(struct mc13783 *mc13783)
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{
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unsigned int reg_adc0, reg_adc1;
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reg_adc0 = MC13783_ADC0_ADREFEN | MC13783_ADC0_ADREFMODE
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| MC13783_ADC0_TSMOD0;
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reg_adc1 = MC13783_ADC1_ADEN | MC13783_ADC1_ADTRIGIGN;
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mc13783_reg_write(mc13783, MC13783_REG_ADC_0, reg_adc0);
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mc13783_reg_write(mc13783, MC13783_REG_ADC_1, reg_adc1);
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}
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int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
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unsigned int channel, unsigned int *sample)
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{
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unsigned int reg_adc0, reg_adc1;
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int i;
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mutex_lock(&mc13783->adc_conv_lock);
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/* set up auto incrementing anyway to make quick read */
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reg_adc0 = MC13783_ADC0_ADINC1 | MC13783_ADC0_ADINC2;
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/* enable the adc, ignore external triggering and set ASC to trigger
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* conversion */
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reg_adc1 = MC13783_ADC1_ADEN | MC13783_ADC1_ADTRIGIGN
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| MC13783_ADC1_ASC;
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/* setup channel number */
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if (channel > 7)
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reg_adc1 |= MC13783_ADC1_ADSEL;
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switch (mode) {
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case MC13783_ADC_MODE_TS:
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/* enables touch screen reference mode and set touchscreen mode
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* to position mode */
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reg_adc0 |= MC13783_ADC0_ADREFEN | MC13783_ADC0_ADREFMODE
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| MC13783_ADC0_TSMOD0 | MC13783_ADC0_TSMOD1;
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reg_adc1 |= 4 << MC13783_ADC1_CHAN1_SHIFT;
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break;
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case MC13783_ADC_MODE_SINGLE_CHAN:
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reg_adc1 |= (channel & 0x7) << MC13783_ADC1_CHAN0_SHIFT;
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reg_adc1 |= MC13783_ADC1_RAND;
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break;
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case MC13783_ADC_MODE_MULT_CHAN:
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reg_adc1 |= 4 << MC13783_ADC1_CHAN1_SHIFT;
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break;
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default:
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return -EINVAL;
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}
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mc13783_reg_write(mc13783, MC13783_REG_ADC_0, reg_adc0);
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mc13783_reg_write(mc13783, MC13783_REG_ADC_1, reg_adc1);
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wait_for_completion_interruptible(&mc13783->adc_done);
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for (i = 0; i < 4; i++)
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mc13783_reg_read(mc13783, MC13783_REG_ADC_2, &sample[i]);
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if (mc13783->ts_active)
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mc13783_adc_set_ts_irq_mode(mc13783);
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mutex_unlock(&mc13783->adc_conv_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mc13783_adc_do_conversion);
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void mc13783_adc_set_ts_status(struct mc13783 *mc13783, unsigned int status)
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{
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mc13783->ts_active = status;
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}
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EXPORT_SYMBOL_GPL(mc13783_adc_set_ts_status);
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static int mc13783_check_revision(struct mc13783 *mc13783)
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{
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u32 rev_id, rev1, rev2, finid, icid;
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mc13783_read(mc13783, MC13783_REG_REVISION, &rev_id);
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rev1 = (rev_id & 0x018) >> 3;
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rev2 = (rev_id & 0x007);
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icid = (rev_id & 0x01C0) >> 6;
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finid = (rev_id & 0x01E00) >> 9;
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/* Ver 0.2 is actually 3.2a. Report as 3.2 */
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if ((rev1 == 0) && (rev2 == 2))
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rev1 = 3;
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if (rev1 == 0 || icid != 2) {
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dev_err(mc13783->dev, "No MC13783 detected.\n");
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return -ENODEV;
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}
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mc13783->revision = ((rev1 * 10) + rev2);
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dev_info(mc13783->dev, "MC13783 Rev %d.%d FinVer %x detected\n", rev1,
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rev2, finid);
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return 0;
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}
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/*
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* Register a client device. This is non-fatal since there is no need to
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* fail the entire device init due to a single platform device failing.
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*/
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static void mc13783_client_dev_register(struct mc13783 *mc13783,
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const char *name)
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{
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struct mfd_cell cell = {};
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cell.name = name;
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mfd_add_devices(mc13783->dev, -1, &cell, 1, NULL, 0);
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}
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static int __devinit mc13783_probe(struct spi_device *spi)
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{
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struct mc13783 *mc13783;
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struct mc13783_platform_data *pdata = spi->dev.platform_data;
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int ret;
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mc13783 = kzalloc(sizeof(struct mc13783), GFP_KERNEL);
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if (!mc13783)
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return -ENOMEM;
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dev_set_drvdata(&spi->dev, mc13783);
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spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
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spi->bits_per_word = 32;
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spi_setup(spi);
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mc13783->spi_device = spi;
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mc13783->dev = &spi->dev;
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mc13783->irq = spi->irq;
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INIT_WORK(&mc13783->work, mc13783_irq_work);
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mutex_init(&mc13783->io_lock);
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mutex_init(&mc13783->adc_conv_lock);
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init_completion(&mc13783->adc_done);
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if (pdata) {
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mc13783->flags = pdata->flags;
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mc13783->regulators = pdata->regulators;
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mc13783->num_regulators = pdata->num_regulators;
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}
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if (mc13783_check_revision(mc13783)) {
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ret = -ENODEV;
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goto err_out;
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}
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/* clear and mask all interrupts */
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mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_0, 0x00ffffff);
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mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_MASK_0, 0x00ffffff);
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mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_STATUS_1, 0x00ffffff);
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mc13783_reg_write(mc13783, MC13783_REG_INTERRUPT_MASK_1, 0x00ffffff);
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/* unmask adcdone interrupts */
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mc13783_set_bits(mc13783, MC13783_REG_INTERRUPT_MASK_0,
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MC13783_INT_MASK_ADCDONEM, 0);
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ret = request_irq(mc13783->irq, mc13783_interrupt,
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IRQF_DISABLED | IRQF_TRIGGER_HIGH, "mc13783",
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mc13783);
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if (ret)
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goto err_out;
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if (mc13783->flags & MC13783_USE_CODEC)
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mc13783_client_dev_register(mc13783, "mc13783-codec");
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if (mc13783->flags & MC13783_USE_ADC)
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mc13783_client_dev_register(mc13783, "mc13783-adc");
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if (mc13783->flags & MC13783_USE_RTC)
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mc13783_client_dev_register(mc13783, "mc13783-rtc");
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if (mc13783->flags & MC13783_USE_REGULATOR)
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mc13783_client_dev_register(mc13783, "mc13783-regulator");
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if (mc13783->flags & MC13783_USE_TOUCHSCREEN)
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mc13783_client_dev_register(mc13783, "mc13783-ts");
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return 0;
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err_out:
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kfree(mc13783);
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return ret;
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}
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static int __devexit mc13783_remove(struct spi_device *spi)
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{
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struct mc13783 *mc13783;
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mc13783 = dev_get_drvdata(&spi->dev);
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free_irq(mc13783->irq, mc13783);
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mfd_remove_devices(&spi->dev);
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return 0;
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}
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static struct spi_driver pmic_driver = {
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.driver = {
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.name = "mc13783",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = mc13783_probe,
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.remove = __devexit_p(mc13783_remove),
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};
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static int __init pmic_init(void)
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{
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return spi_register_driver(&pmic_driver);
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}
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subsys_initcall(pmic_init);
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static void __exit pmic_exit(void)
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{
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spi_unregister_driver(&pmic_driver);
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}
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module_exit(pmic_exit);
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MODULE_DESCRIPTION("Core/Protocol driver for Freescale MC13783 PMIC");
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MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
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MODULE_LICENSE("GPL");
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