diff options
Diffstat (limited to 'drivers/mfd/pcf50606-core.c')
-rw-r--r-- | drivers/mfd/pcf50606-core.c | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/mfd/pcf50606-core.c b/drivers/mfd/pcf50606-core.c new file mode 100644 index 00000000000..47a8aa11954 --- /dev/null +++ b/drivers/mfd/pcf50606-core.c @@ -0,0 +1,580 @@ +/* Philips PCF50606 Power Management Unit (PMU) driver + * + * (C) 2006-2008 by Openmoko, Inc. + * Author: Harald Welte <laforge@openmoko.org> + * Matt Hsu <matt@openmoko.org> + * All rights reserved. + * + * 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; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ +#include <linux/i2c.h> +#include <linux/irq.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/platform_device.h> + +#include <linux/mfd/pcf50606/core.h> + +/* Read a block of upto 32 regs */ +int pcf50606_read_block(struct pcf50606 *pcf , u8 reg, + int nr_regs, u8 *data) +{ + int ret; + + mutex_lock(&pcf->lock); + ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg, + nr_regs, data); + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_read_block); + +/* Write a block of upto 32 regs */ +int pcf50606_write_block(struct pcf50606 *pcf , u8 reg, + int nr_regs, u8 *data) +{ + int ret; + + mutex_lock(&pcf->lock); + ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg, + nr_regs, data); + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_write_block); + +u8 pcf50606_reg_read(struct pcf50606 *pcf, u8 reg) +{ + int ret; + + mutex_lock(&pcf->lock); + ret = i2c_smbus_read_byte_data(pcf->i2c_client, reg); + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_reg_read); + +int pcf50606_reg_write(struct pcf50606 *pcf, u8 reg, u8 val) +{ + int ret; + mutex_lock(&pcf->lock); + ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, val); + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_reg_write); + +int pcf50606_reg_set_bit_mask(struct pcf50606 *pcf, u8 reg, u8 mask, u8 val) +{ + int ret; + u8 tmp; + + val &= mask; + + mutex_lock(&pcf->lock); + + tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg); + tmp &= ~mask; + tmp |= val; + ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp); + + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_reg_set_bit_mask); + +int pcf50606_reg_clear_bits(struct pcf50606 *pcf, u8 reg, u8 val) +{ + int ret; + u8 tmp; + + mutex_lock(&pcf->lock); + + tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg); + tmp &= ~val; + ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp); + + mutex_unlock(&pcf->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcf50606_reg_clear_bits); + +static ssize_t show_resume_reason(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pcf50606 *pcf = dev_get_drvdata(dev); + int n; + + n = sprintf(buf, "%02x%02x%02x%02x%02x\n", + pcf->resume_reason[0], + pcf->resume_reason[1], + pcf->resume_reason[2], + pcf->resume_reason[3], + pcf->resume_reason[4]); + + return n; +} +static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL); + +static struct attribute *pcf_sysfs_entries[] = { + &dev_attr_resume_reason.attr, + NULL, +}; + +static struct attribute_group pcf_attr_group = { + .name = NULL, /* put in device directory */ + .attrs = pcf_sysfs_entries, +}; + + +static int pcf50606_irq_mask_set(struct pcf50606 *pcf, int irq, int mask) +{ + u8 reg, bits, tmp; + int ret = 0, idx; + + idx = irq / 8; + reg = PCF50606_REG_INT1M + idx; + bits = 1 << (irq % 8); + + mutex_lock(&pcf->lock); + + if (mask) { + tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg); + tmp |= bits; + ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp); + + pcf->mask_regs[idx] &= ~bits; + pcf->mask_regs[idx] |= bits; + } else { + tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg); + tmp &= ~bits; + ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp); + + pcf->mask_regs[idx] &= ~bits; + } + + mutex_unlock(&pcf->lock); + + return 0; +} + +int pcf50606_irq_mask(struct pcf50606 *pcf, int irq) +{ + dev_info(pcf->dev, "Masking IRQ %d\n", irq); + + return pcf50606_irq_mask_set(pcf, irq, 1); +} +EXPORT_SYMBOL_GPL(pcf50606_irq_mask); + +int pcf50606_irq_unmask(struct pcf50606 *pcf, int irq) +{ + dev_info(pcf->dev, "Unmasking IRQ %d\n", irq); + + return pcf50606_irq_mask_set(pcf, irq, 0); +} +EXPORT_SYMBOL_GPL(pcf50606_irq_unmask); + +int pcf50606_irq_mask_get(struct pcf50606 *pcf, int irq) +{ + u8 reg, bits; + + reg = (irq / 8); + bits = (1 << (irq % 8)); + + return pcf->mask_regs[reg] & bits; +} +EXPORT_SYMBOL_GPL(pcf50606_irq_mask_get); + +static void pcf50606_irq_call_handler(struct pcf50606 *pcf, + int irq) +{ + if (pcf->irq_handler[irq].handler) + pcf->irq_handler[irq].handler(pcf, irq, + pcf->irq_handler[irq].data); +} + +#define PCF50606_ONKEY1S_TIMEOUT 8 + +static void pcf50606_irq_worker(struct work_struct *work) +{ + struct pcf50606 *pcf; + int ret, i, j; + u8 pcf_int[3], chgstat; + + pcf = container_of(work, struct pcf50606, irq_work); + + /* Read the 3 INT regs in one transaction */ + ret = pcf50606_read_block(pcf, PCF50606_REG_INT1, + sizeof(pcf_int), pcf_int); + if (ret != sizeof(pcf_int)) { + dev_info(pcf->dev, "Error reading INT registers\n"); + + /* We don't have an option but to retry. Because if + * we don't, there won't be another interrupt edge. + */ + goto reschedule; + } + + /* We immediately read the usb and adapter status. We thus make sure + * only of CHGINS/CHGRM handlers are called */ + if (pcf_int[1] & (PCF50606_INT2_CHGINS | PCF50606_INT2_CHGRM)) { + chgstat = pcf50606_reg_read(pcf, PCF50606_REG_MBCS1); + if (chgstat & (0x1 << 4)) + pcf_int[1] &= ~(1 << PCF50606_INT2_CHGRM); + else + pcf_int[1] &= ~(1 << PCF50606_INT2_CHGINS); + } + + dev_info(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x", + pcf_int[0], pcf_int[1], pcf_int[2]); + + /* Some revisions of the chip don't have a 8s standby mode on + * ONKEY1S press. We try to manually do it in such cases. */ + + if (pcf_int[0] & PCF50606_INT1_SECOND && pcf->onkey1s_held) { + dev_info(pcf->dev, "ONKEY1S held for %d secs\n", + pcf->onkey1s_held); + if (pcf->onkey1s_held++ == PCF50606_ONKEY1S_TIMEOUT) + if (pcf->pdata->force_shutdown) + pcf->pdata->force_shutdown(pcf); + } + + if (pcf_int[0] & PCF50606_INT1_ONKEY1S) { + dev_info(pcf->dev, "ONKEY1S held\n"); + pcf->onkey1s_held = 1 ; + + /* Unmask IRQ_SECOND */ + pcf50606_reg_clear_bits(pcf, PCF50606_REG_INT1M, + PCF50606_INT1_SECOND); + + /* Unmask IRQ_ONKEYF */ + pcf50606_reg_clear_bits(pcf, PCF50606_REG_INT1M, + PCF50606_INT1_ONKEYF); + } + + if ((pcf_int[0] & PCF50606_INT1_ONKEYR) && pcf->onkey1s_held) { + pcf->onkey1s_held = 0; + + /* Mask SECOND and ONKEYF interrupts */ + if (pcf->mask_regs[0] & PCF50606_INT1_SECOND) + pcf50606_reg_set_bit_mask(pcf, + PCF50606_REG_INT1M, + PCF50606_INT1_SECOND, + PCF50606_INT1_SECOND); + + if (pcf->mask_regs[0] & PCF50606_INT1_ONKEYF) + pcf50606_reg_set_bit_mask(pcf, + PCF50606_REG_INT1M, + PCF50606_INT1_ONKEYF, + PCF50606_INT1_ONKEYF); + } + + /* Have we just resumed ? */ + if (pcf->is_suspended) { + + pcf->is_suspended = 0; + + /* Set the resume reason filtering out non resumers */ + for (i = 0; i < ARRAY_SIZE(pcf_int); i++) + pcf->resume_reason[i] = pcf_int[i] & + pcf->pdata->resumers[i]; + + /* Make sure we don't pass on any input events to + * userspace now */ + pcf_int[0] &= ~(PCF50606_INT1_SECOND | PCF50606_INT1_ALARM); + } + + /* Unset masked interrupts */ + for (i = 0; i < ARRAY_SIZE(pcf_int); i++) + pcf_int[i] &= ~pcf->mask_regs[i]; + + for (i = 0; i < ARRAY_SIZE(pcf_int); i++) + for (j = 0; j < 8 ; j++) + if (pcf_int[i] & (1 << j)) + pcf50606_irq_call_handler(pcf, (i * 8) + j); + + put_device(pcf->dev); + + return; +reschedule: + schedule_work(&pcf->irq_work); + + /* Don't put_device here. Will be used when we are rescheduled */ + + return; +} + +static irqreturn_t pcf50606_irq(int irq, void *data) +{ + struct pcf50606 *pcf = data; + + get_device(pcf->dev); + schedule_work(&pcf->irq_work); + + return IRQ_HANDLED; +} + +static void +pcf50606_client_dev_register(struct pcf50606 *pcf, const char *name, + struct platform_device **pdev) +{ + int ret; + + *pdev = platform_device_alloc(name, -1); + + if (!pdev) { + dev_err(pcf->dev, "Falied to allocate %s\n", name); + return; + } + + (*pdev)->dev.parent = pcf->dev; + platform_set_drvdata(*pdev, pcf); + + ret = platform_device_add(*pdev); + if (ret != 0) { + dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); + platform_device_put(*pdev); + *pdev = NULL; + } +} + +#ifdef CONFIG_PM +static int pcf50606_suspend(struct device *dev, pm_message_t state) +{ + struct pcf50606 *pcf; + int ret, i; + u8 res[3]; + + pcf = dev_get_drvdata(dev); + + /* Make sure our interrupt handlers are not called + * henceforth */ + disable_irq(pcf->irq); + + /* Make sure that an IRQ worker has quit */ + cancel_work_sync(&pcf->irq_work); + + /* Save the masks */ + ret = pcf50606_read_block(pcf, PCF50606_REG_INT1M, + ARRAY_SIZE(pcf->suspend_irq_masks), + pcf->suspend_irq_masks); + if (ret < 0) + dev_err(pcf->dev, "error saving irq masks\n"); + + /* Set interrupt masks. So that only those sources we want to wake + * us up can + */ + for (i = 0; i < ARRAY_SIZE(res); i++) + res[i] = ~pcf->pdata->resumers[i]; + + pcf50606_write_block(pcf, PCF50606_REG_INT1M, + ARRAY_SIZE(res), &res[0]); + + pcf->is_suspended = 1; + + return 0; +} + +static int pcf50606_resume(struct device *dev) +{ + struct pcf50606 *pcf; + + pcf = dev_get_drvdata(dev); + + /* Write the saved mask registers */ + pcf50606_write_block(pcf, PCF50606_REG_INT1M, + ARRAY_SIZE(pcf->suspend_irq_masks), + pcf->suspend_irq_masks); + + /* Clear any pending interrupts and set resume reason if any */ + pcf50606_irq_worker(&pcf->irq_work); + + enable_irq(pcf->irq); + + return 0; +} +#else +#define pcf50606_suspend NULL +#define pcf50606_resume NULL +#endif + +static int pcf50606_probe(struct i2c_client *client, + const struct i2c_device_id *ids) +{ + struct pcf50606 *pcf; + struct pcf50606_platform_data *pdata; + int i, ret = 0; + int version, variant; + u8 mbcs1; + + pdata = client->dev.platform_data; + + pcf = kzalloc(sizeof(*pcf), GFP_KERNEL); + if (!pcf) + return -ENOMEM; + + pcf->pdata = pdata; + pdata->pcf = pcf; + + mutex_init(&pcf->lock); + + i2c_set_clientdata(client, pcf); + pcf->dev = &client->dev; + pcf->i2c_client = client; + + INIT_WORK(&pcf->irq_work, pcf50606_irq_worker); + + version = pcf50606_reg_read(pcf, 0); + if (version < 0) { + dev_err(pcf->dev, "Unable to probe pcf50606\n"); + kfree(pcf); + return -ENODEV; + } + + variant = pcf50606_reg_read(pcf, 1); + if (version < 0) { + dev_err(pcf->dev, "Unable to probe pcf50606\n"); + kfree(pcf); + return -ENODEV; + } + + dev_info(pcf->dev, "Probed device version %d variant %d\n", + version, variant); + + /* Enable all inteerupts except RTC SECOND */ + pcf->mask_regs[0] = 0x80; + pcf50606_reg_write(pcf, PCF50606_REG_INT1M, 0x80); + + pcf50606_reg_write(pcf, PCF50606_REG_INT2M, 0x00); + pcf50606_reg_write(pcf, PCF50606_REG_INT3M, 0x00); + + pcf50606_client_dev_register(pcf, "pcf50606-input", + &pcf->input.pdev); + pcf50606_client_dev_register(pcf, "pcf50606-rtc", + &pcf->rtc.pdev); + pcf50606_client_dev_register(pcf, "pcf50606-mbc", + &pcf->mbc.pdev); + pcf50606_client_dev_register(pcf, "pcf50606-adc", + &pcf->adc.pdev); + pcf50606_client_dev_register(pcf, "pcf50606-wdt", + &pcf->wdt.pdev); + for (i = 0; i < PCF50606_NUM_REGULATORS; i++) { + struct platform_device *pdev; + + pdev = platform_device_alloc("pcf50606-regltr", i); + if (!pdev) { + dev_err(pcf->dev, "Cannot create regulator\n"); + continue; + } + + pdev->dev.parent = pcf->dev; + pdev->dev.platform_data = &pdata->reg_init_data[i]; + pdev->dev.driver_data = pcf; + pcf->pmic.pdev[i] = pdev; + + platform_device_add(pdev); + } + + pcf->irq = client->irq; + + if (client->irq) { + ret = request_irq(client->irq, pcf50606_irq, + IRQF_TRIGGER_FALLING, "pcf50606", pcf); + + if (ret) { + dev_err(pcf->dev, "Failed to request IRQ %d\n", ret); + goto err; + } + } else { + dev_err(pcf->dev, "No IRQ configured\n"); + goto err; + } + + if (enable_irq_wake(client->irq) < 0) + dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source" + "in this hardware revision", client->irq); + + /* Cold Intialization */ + mbcs1 = pcf50606_reg_read(pcf, PCF50606_REG_MBCS1); + + if (mbcs1 & (0x01 << 4)) /* Charger present ? */ + pcf50606_irq_call_handler(pcf, PCF50606_IRQ_CHGINS); + + ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group); + if (ret) + dev_err(pcf->dev, "error creating sysfs entries\n"); + + if (pdata->probe_done) + pdata->probe_done(pcf); + + return 0; + +err: + kfree(pcf); + return ret; +} + +static int pcf50606_remove(struct i2c_client *client) +{ + struct pcf50606 *pcf = i2c_get_clientdata(client); + + free_irq(pcf->irq, pcf); + kfree(pcf); + + return 0; +} + +static struct i2c_device_id pcf50606_id_table[] = { + {"pcf50606", 0x73}, +}; + +static struct i2c_driver pcf50606_driver = { + .driver = { + .name = "pcf50606", + .suspend = pcf50606_suspend, + .resume = pcf50606_resume, + }, + .id_table = pcf50606_id_table, + .probe = pcf50606_probe, + .remove = pcf50606_remove, +}; + +static int __init pcf50606_init(void) +{ + return i2c_add_driver(&pcf50606_driver); +} + +static void pcf50606_exit(void) +{ + i2c_del_driver(&pcf50606_driver); +} + +MODULE_DESCRIPTION("I2C chip driver for NXP PCF50606 PMU"); +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); +MODULE_LICENSE("GPL"); + +module_init(pcf50606_init); +module_exit(pcf50606_exit); |