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path: root/drivers/mfd/pcf50606-core.c
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Diffstat (limited to 'drivers/mfd/pcf50606-core.c')
-rw-r--r--drivers/mfd/pcf50606-core.c580
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);