diff options
Diffstat (limited to 'drivers/mfd/pcf50633-core.c')
| -rw-r--r-- | drivers/mfd/pcf50633-core.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/drivers/mfd/pcf50633-core.c b/drivers/mfd/pcf50633-core.c new file mode 100644 index 00000000..189c2f07 --- /dev/null +++ b/drivers/mfd/pcf50633-core.c @@ -0,0 +1,340 @@ +/* NXP PCF50633 Power Management Unit (PMU) driver + * + * (C) 2006-2008 by Openmoko, Inc. + * Author: Harald Welte <laforge@openmoko.org> + * Balaji Rao <balajirrao@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. + * + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/pm.h> +#include <linux/slab.h> +#include <linux/regmap.h> +#include <linux/err.h> + +#include <linux/mfd/pcf50633/core.h> + +/* Read a block of up to 32 regs */ +int pcf50633_read_block(struct pcf50633 *pcf, u8 reg, + int nr_regs, u8 *data) +{ + int ret; + + ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs); + if (ret != 0) + return ret; + + return nr_regs; +} +EXPORT_SYMBOL_GPL(pcf50633_read_block); + +/* Write a block of up to 32 regs */ +int pcf50633_write_block(struct pcf50633 *pcf , u8 reg, + int nr_regs, u8 *data) +{ + return regmap_raw_write(pcf->regmap, reg, data, nr_regs); +} +EXPORT_SYMBOL_GPL(pcf50633_write_block); + +u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg) +{ + unsigned int val; + int ret; + + ret = regmap_read(pcf->regmap, reg, &val); + if (ret < 0) + return -1; + + return val; +} +EXPORT_SYMBOL_GPL(pcf50633_reg_read); + +int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val) +{ + return regmap_write(pcf->regmap, reg, val); +} +EXPORT_SYMBOL_GPL(pcf50633_reg_write); + +int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val) +{ + return regmap_update_bits(pcf->regmap, reg, mask, val); +} +EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask); + +int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val) +{ + return regmap_update_bits(pcf->regmap, reg, val, 0); +} +EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits); + +/* sysfs attributes */ +static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct pcf50633 *pcf = dev_get_drvdata(dev); + u8 dump[16]; + int n, n1, idx = 0; + char *buf1 = buf; + static u8 address_no_read[] = { /* must be ascending */ + PCF50633_REG_INT1, + PCF50633_REG_INT2, + PCF50633_REG_INT3, + PCF50633_REG_INT4, + PCF50633_REG_INT5, + 0 /* terminator */ + }; + + for (n = 0; n < 256; n += sizeof(dump)) { + for (n1 = 0; n1 < sizeof(dump); n1++) + if (n == address_no_read[idx]) { + idx++; + dump[n1] = 0x00; + } else + dump[n1] = pcf50633_reg_read(pcf, n + n1); + + hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0); + buf1 += strlen(buf1); + *buf1++ = '\n'; + *buf1 = '\0'; + } + + return buf1 - buf; +} +static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL); + +static ssize_t show_resume_reason(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pcf50633 *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_dump_regs.attr, + &dev_attr_resume_reason.attr, + NULL, +}; + +static struct attribute_group pcf_attr_group = { + .name = NULL, /* put in device directory */ + .attrs = pcf_sysfs_entries, +}; + +static void +pcf50633_client_dev_register(struct pcf50633 *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; + + ret = platform_device_add(*pdev); + if (ret) { + dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret); + platform_device_put(*pdev); + *pdev = NULL; + } +} + +#ifdef CONFIG_PM_SLEEP +static int pcf50633_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct pcf50633 *pcf = i2c_get_clientdata(client); + + return pcf50633_irq_suspend(pcf); +} + +static int pcf50633_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct pcf50633 *pcf = i2c_get_clientdata(client); + + return pcf50633_irq_resume(pcf); +} +#endif + +static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume); + +static struct regmap_config pcf50633_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int __devinit pcf50633_probe(struct i2c_client *client, + const struct i2c_device_id *ids) +{ + struct pcf50633 *pcf; + struct pcf50633_platform_data *pdata = client->dev.platform_data; + int i, ret; + int version, variant; + + if (!client->irq) { + dev_err(&client->dev, "Missing IRQ\n"); + return -ENOENT; + } + + pcf = kzalloc(sizeof(*pcf), GFP_KERNEL); + if (!pcf) + return -ENOMEM; + + pcf->pdata = pdata; + + mutex_init(&pcf->lock); + + pcf->regmap = regmap_init_i2c(client, &pcf50633_regmap_config); + if (IS_ERR(pcf->regmap)) { + ret = PTR_ERR(pcf->regmap); + dev_err(pcf->dev, "Failed to allocate register map: %d\n", + ret); + goto err_free; + } + + i2c_set_clientdata(client, pcf); + pcf->dev = &client->dev; + + version = pcf50633_reg_read(pcf, 0); + variant = pcf50633_reg_read(pcf, 1); + if (version < 0 || variant < 0) { + dev_err(pcf->dev, "Unable to probe pcf50633\n"); + ret = -ENODEV; + goto err_regmap; + } + + dev_info(pcf->dev, "Probed device version %d variant %d\n", + version, variant); + + pcf50633_irq_init(pcf, client->irq); + + /* Create sub devices */ + pcf50633_client_dev_register(pcf, "pcf50633-input", + &pcf->input_pdev); + pcf50633_client_dev_register(pcf, "pcf50633-rtc", + &pcf->rtc_pdev); + pcf50633_client_dev_register(pcf, "pcf50633-mbc", + &pcf->mbc_pdev); + pcf50633_client_dev_register(pcf, "pcf50633-adc", + &pcf->adc_pdev); + pcf50633_client_dev_register(pcf, "pcf50633-backlight", + &pcf->bl_pdev); + + + for (i = 0; i < PCF50633_NUM_REGULATORS; i++) { + struct platform_device *pdev; + + pdev = platform_device_alloc("pcf50633-regltr", i); + if (!pdev) { + dev_err(pcf->dev, "Cannot create regulator %d\n", i); + continue; + } + + pdev->dev.parent = pcf->dev; + platform_device_add_data(pdev, &pdata->reg_init_data[i], + sizeof(pdata->reg_init_data[i])); + pcf->regulator_pdev[i] = pdev; + + platform_device_add(pdev); + } + + 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_regmap: + regmap_exit(pcf->regmap); +err_free: + kfree(pcf); + + return ret; +} + +static int __devexit pcf50633_remove(struct i2c_client *client) +{ + struct pcf50633 *pcf = i2c_get_clientdata(client); + int i; + + sysfs_remove_group(&client->dev.kobj, &pcf_attr_group); + pcf50633_irq_free(pcf); + + platform_device_unregister(pcf->input_pdev); + platform_device_unregister(pcf->rtc_pdev); + platform_device_unregister(pcf->mbc_pdev); + platform_device_unregister(pcf->adc_pdev); + platform_device_unregister(pcf->bl_pdev); + + for (i = 0; i < PCF50633_NUM_REGULATORS; i++) + platform_device_unregister(pcf->regulator_pdev[i]); + + regmap_exit(pcf->regmap); + kfree(pcf); + + return 0; +} + +static const struct i2c_device_id pcf50633_id_table[] = { + {"pcf50633", 0x73}, + {/* end of list */} +}; +MODULE_DEVICE_TABLE(i2c, pcf50633_id_table); + +static struct i2c_driver pcf50633_driver = { + .driver = { + .name = "pcf50633", + .pm = &pcf50633_pm, + }, + .id_table = pcf50633_id_table, + .probe = pcf50633_probe, + .remove = __devexit_p(pcf50633_remove), +}; + +static int __init pcf50633_init(void) +{ + return i2c_add_driver(&pcf50633_driver); +} + +static void __exit pcf50633_exit(void) +{ + i2c_del_driver(&pcf50633_driver); +} + +MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU"); +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); +MODULE_LICENSE("GPL"); + +subsys_initcall(pcf50633_init); +module_exit(pcf50633_exit); |