diff options
Diffstat (limited to 'drivers/mfd/ab3550-core.c')
| -rw-r--r-- | drivers/mfd/ab3550-core.c | 1401 |
1 files changed, 1401 insertions, 0 deletions
diff --git a/drivers/mfd/ab3550-core.c b/drivers/mfd/ab3550-core.c new file mode 100644 index 000000000000..1060f8e1c40a --- /dev/null +++ b/drivers/mfd/ab3550-core.c @@ -0,0 +1,1401 @@ +/* + * Copyright (C) 2007-2010 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * Low-level core for exclusive access to the AB3550 IC on the I2C bus + * and some basic chip-configuration. + * Author: Bengt Jonsson <bengt.g.jonsson@stericsson.com> + * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> + * Author: Mattias Wallin <mattias.wallin@stericsson.com> + * Author: Rickard Andersson <rickard.andersson@stericsson.com> + */ + +#include <linux/i2c.h> +#include <linux/mutex.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/random.h> +#include <linux/workqueue.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/mfd/abx500.h> +#include <linux/list.h> +#include <linux/bitops.h> +#include <linux/spinlock.h> +#include <linux/mfd/core.h> + +#define AB3550_NAME_STRING "ab3550" +#define AB3550_ID_FORMAT_STRING "AB3550 %s" +#define AB3550_NUM_BANKS 2 +#define AB3550_NUM_EVENT_REG 5 + +/* These are the only registers inside AB3550 used in this main file */ + +/* Chip ID register */ +#define AB3550_CID_REG 0x20 + +/* Interrupt event registers */ +#define AB3550_EVENT_BANK 0 +#define AB3550_EVENT_REG 0x22 + +/* Read/write operation values. */ +#define AB3550_PERM_RD (0x01) +#define AB3550_PERM_WR (0x02) + +/* Read/write permissions. */ +#define AB3550_PERM_RO (AB3550_PERM_RD) +#define AB3550_PERM_RW (AB3550_PERM_RD | AB3550_PERM_WR) + +/** + * struct ab3550 + * @access_mutex: lock out concurrent accesses to the AB registers + * @i2c_client: I2C client for this chip + * @chip_name: name of this chip variant + * @chip_id: 8 bit chip ID for this chip variant + * @mask_work: a worker for writing to mask registers + * @event_lock: a lock to protect the event_mask + * @event_mask: a local copy of the mask event registers + * @startup_events: a copy of the first reading of the event registers + * @startup_events_read: whether the first events have been read + */ +struct ab3550 { + struct mutex access_mutex; + struct i2c_client *i2c_client[AB3550_NUM_BANKS]; + char chip_name[32]; + u8 chip_id; + struct work_struct mask_work; + spinlock_t event_lock; + u8 event_mask[AB3550_NUM_EVENT_REG]; + u8 startup_events[AB3550_NUM_EVENT_REG]; + bool startup_events_read; +#ifdef CONFIG_DEBUG_FS + unsigned int debug_bank; + unsigned int debug_address; +#endif +}; + +/** + * struct ab3550_reg_range + * @first: the first address of the range + * @last: the last address of the range + * @perm: access permissions for the range + */ +struct ab3550_reg_range { + u8 first; + u8 last; + u8 perm; +}; + +/** + * struct ab3550_reg_ranges + * @count: the number of ranges in the list + * @range: the list of register ranges + */ +struct ab3550_reg_ranges { + u8 count; + const struct ab3550_reg_range *range; +}; + +/* + * Permissible register ranges for reading and writing per device and bank. + * + * The ranges must be listed in increasing address order, and no overlaps are + * allowed. It is assumed that write permission implies read permission + * (i.e. only RO and RW permissions should be used). Ranges with write + * permission must not be split up. + */ + +#define NO_RANGE {.count = 0, .range = NULL,} + +static struct +ab3550_reg_ranges ab3550_reg_ranges[AB3550_NUM_DEVICES][AB3550_NUM_BANKS] = { + [AB3550_DEVID_DAC] = { + NO_RANGE, + { + .count = 2, + .range = (struct ab3550_reg_range[]) { + { + .first = 0xb0, + .last = 0xba, + .perm = AB3550_PERM_RW, + }, + { + .first = 0xbc, + .last = 0xc3, + .perm = AB3550_PERM_RW, + }, + }, + }, + }, + [AB3550_DEVID_LEDS] = { + NO_RANGE, + { + .count = 2, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x5a, + .last = 0x88, + .perm = AB3550_PERM_RW, + }, + { + .first = 0x8a, + .last = 0xad, + .perm = AB3550_PERM_RW, + }, + } + }, + }, + [AB3550_DEVID_POWER] = { + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x21, + .last = 0x21, + .perm = AB3550_PERM_RO, + }, + } + }, + NO_RANGE, + }, + [AB3550_DEVID_REGULATORS] = { + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x69, + .last = 0xa3, + .perm = AB3550_PERM_RW, + }, + } + }, + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x14, + .last = 0x16, + .perm = AB3550_PERM_RW, + }, + } + }, + }, + [AB3550_DEVID_SIM] = { + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x21, + .last = 0x21, + .perm = AB3550_PERM_RO, + }, + } + }, + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x14, + .last = 0x17, + .perm = AB3550_PERM_RW, + }, + } + + }, + }, + [AB3550_DEVID_UART] = { + NO_RANGE, + NO_RANGE, + }, + [AB3550_DEVID_RTC] = { + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x00, + .last = 0x0c, + .perm = AB3550_PERM_RW, + }, + } + }, + NO_RANGE, + }, + [AB3550_DEVID_CHARGER] = { + { + .count = 2, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x10, + .last = 0x1a, + .perm = AB3550_PERM_RW, + }, + { + .first = 0x21, + .last = 0x21, + .perm = AB3550_PERM_RO, + }, + } + }, + NO_RANGE, + }, + [AB3550_DEVID_ADC] = { + NO_RANGE, + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x20, + .last = 0x56, + .perm = AB3550_PERM_RW, + }, + + } + }, + }, + [AB3550_DEVID_FUELGAUGE] = { + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x21, + .last = 0x21, + .perm = AB3550_PERM_RO, + }, + } + }, + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x00, + .last = 0x0e, + .perm = AB3550_PERM_RW, + }, + } + }, + }, + [AB3550_DEVID_VIBRATOR] = { + NO_RANGE, + { + .count = 1, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x10, + .last = 0x13, + .perm = AB3550_PERM_RW, + }, + + } + }, + }, + [AB3550_DEVID_CODEC] = { + { + .count = 2, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x31, + .last = 0x63, + .perm = AB3550_PERM_RW, + }, + { + .first = 0x65, + .last = 0x68, + .perm = AB3550_PERM_RW, + }, + } + }, + NO_RANGE, + }, +}; + +static struct mfd_cell ab3550_devs[AB3550_NUM_DEVICES] = { + [AB3550_DEVID_DAC] = { + .name = "ab3550-dac", + .id = AB3550_DEVID_DAC, + .num_resources = 0, + }, + [AB3550_DEVID_LEDS] = { + .name = "ab3550-leds", + .id = AB3550_DEVID_LEDS, + }, + [AB3550_DEVID_POWER] = { + .name = "ab3550-power", + .id = AB3550_DEVID_POWER, + }, + [AB3550_DEVID_REGULATORS] = { + .name = "ab3550-regulators", + .id = AB3550_DEVID_REGULATORS, + }, + [AB3550_DEVID_SIM] = { + .name = "ab3550-sim", + .id = AB3550_DEVID_SIM, + }, + [AB3550_DEVID_UART] = { + .name = "ab3550-uart", + .id = AB3550_DEVID_UART, + }, + [AB3550_DEVID_RTC] = { + .name = "ab3550-rtc", + .id = AB3550_DEVID_RTC, + }, + [AB3550_DEVID_CHARGER] = { + .name = "ab3550-charger", + .id = AB3550_DEVID_CHARGER, + }, + [AB3550_DEVID_ADC] = { + .name = "ab3550-adc", + .id = AB3550_DEVID_ADC, + .num_resources = 10, + .resources = (struct resource[]) { + { + .name = "TRIGGER-0", + .flags = IORESOURCE_IRQ, + .start = 16, + .end = 16, + }, + { + .name = "TRIGGER-1", + .flags = IORESOURCE_IRQ, + .start = 17, + .end = 17, + }, + { + .name = "TRIGGER-2", + .flags = IORESOURCE_IRQ, + .start = 18, + .end = 18, + }, + { + .name = "TRIGGER-3", + .flags = IORESOURCE_IRQ, + .start = 19, + .end = 19, + }, + { + .name = "TRIGGER-4", + .flags = IORESOURCE_IRQ, + .start = 20, + .end = 20, + }, + { + .name = "TRIGGER-5", + .flags = IORESOURCE_IRQ, + .start = 21, + .end = 21, + }, + { + .name = "TRIGGER-6", + .flags = IORESOURCE_IRQ, + .start = 22, + .end = 22, + }, + { + .name = "TRIGGER-7", + .flags = IORESOURCE_IRQ, + .start = 23, + .end = 23, + }, + { + .name = "TRIGGER-VBAT-TXON", + .flags = IORESOURCE_IRQ, + .start = 13, + .end = 13, + }, + { + .name = "TRIGGER-VBAT", + .flags = IORESOURCE_IRQ, + .start = 12, + .end = 12, + }, + }, + }, + [AB3550_DEVID_FUELGAUGE] = { + .name = "ab3550-fuelgauge", + .id = AB3550_DEVID_FUELGAUGE, + }, + [AB3550_DEVID_VIBRATOR] = { + .name = "ab3550-vibrator", + .id = AB3550_DEVID_VIBRATOR, + }, + [AB3550_DEVID_CODEC] = { + .name = "ab3550-codec", + .id = AB3550_DEVID_CODEC, + }, +}; + +/* + * I2C transactions with error messages. + */ +static int ab3550_i2c_master_send(struct ab3550 *ab, u8 bank, u8 *data, + u8 count) +{ + int err; + + err = i2c_master_send(ab->i2c_client[bank], data, count); + if (err < 0) { + dev_err(&ab->i2c_client[0]->dev, "send error: %d\n", err); + return err; + } + return 0; +} + +static int ab3550_i2c_master_recv(struct ab3550 *ab, u8 bank, u8 *data, + u8 count) +{ + int err; + + err = i2c_master_recv(ab->i2c_client[bank], data, count); + if (err < 0) { + dev_err(&ab->i2c_client[0]->dev, "receive error: %d\n", err); + return err; + } + return 0; +} + +/* + * Functionality for getting/setting register values. + */ +static int get_register_interruptible(struct ab3550 *ab, u8 bank, u8 reg, + u8 *value) +{ + int err; + + err = mutex_lock_interruptible(&ab->access_mutex); + if (err) + return err; + + err = ab3550_i2c_master_send(ab, bank, ®, 1); + if (!err) + err = ab3550_i2c_master_recv(ab, bank, value, 1); + + mutex_unlock(&ab->access_mutex); + return err; +} + +static int get_register_page_interruptible(struct ab3550 *ab, u8 bank, + u8 first_reg, u8 *regvals, u8 numregs) +{ + int err; + + err = mutex_lock_interruptible(&ab->access_mutex); + if (err) + return err; + + err = ab3550_i2c_master_send(ab, bank, &first_reg, 1); + if (!err) + err = ab3550_i2c_master_recv(ab, bank, regvals, numregs); + + mutex_unlock(&ab->access_mutex); + return err; +} + +static int mask_and_set_register_interruptible(struct ab3550 *ab, u8 bank, + u8 reg, u8 bitmask, u8 bitvalues) +{ + int err = 0; + + if (likely(bitmask)) { + u8 reg_bits[2] = {reg, 0}; + + err = mutex_lock_interruptible(&ab->access_mutex); + if (err) + return err; + + if (bitmask == 0xFF) /* No need to read in this case. */ + reg_bits[1] = bitvalues; + else { /* Read and modify the register value. */ + u8 bits; + + err = ab3550_i2c_master_send(ab, bank, ®, 1); + if (err) + goto unlock_and_return; + err = ab3550_i2c_master_recv(ab, bank, &bits, 1); + if (err) + goto unlock_and_return; + reg_bits[1] = ((~bitmask & bits) | + (bitmask & bitvalues)); + } + /* Write the new value. */ + err = ab3550_i2c_master_send(ab, bank, reg_bits, 2); +unlock_and_return: + mutex_unlock(&ab->access_mutex); + } + return err; +} + +/* + * Read/write permission checking functions. + */ +static bool page_write_allowed(const struct ab3550_reg_ranges *ranges, + u8 first_reg, u8 last_reg) +{ + u8 i; + + if (last_reg < first_reg) + return false; + + for (i = 0; i < ranges->count; i++) { + if (first_reg < ranges->range[i].first) + break; + if ((last_reg <= ranges->range[i].last) && + (ranges->range[i].perm & AB3550_PERM_WR)) + return true; + } + return false; +} + +static bool reg_write_allowed(const struct ab3550_reg_ranges *ranges, u8 reg) +{ + return page_write_allowed(ranges, reg, reg); +} + +static bool page_read_allowed(const struct ab3550_reg_ranges *ranges, + u8 first_reg, u8 last_reg) +{ + u8 i; + + if (last_reg < first_reg) + return false; + /* Find the range (if it exists in the list) that includes first_reg. */ + for (i = 0; i < ranges->count; i++) { + if (first_reg < ranges->range[i].first) + return false; + if (first_reg <= ranges->range[i].last) + break; + } + /* Make sure that the entire range up to and including last_reg is + * readable. This may span several of the ranges in the list. + */ + while ((i < ranges->count) && + (ranges->range[i].perm & AB3550_PERM_RD)) { + if (last_reg <= ranges->range[i].last) + return true; + if ((++i >= ranges->count) || + (ranges->range[i].first != + (ranges->range[i - 1].last + 1))) { + break; + } + } + return false; +} + +static bool reg_read_allowed(const struct ab3550_reg_ranges *ranges, u8 reg) +{ + return page_read_allowed(ranges, reg, reg); +} + +/* + * The exported register access functionality. + */ +int ab3550_get_chip_id(struct device *dev) +{ + struct ab3550 *ab = dev_get_drvdata(dev->parent); + return (int)ab->chip_id; +} + +int ab3550_mask_and_set_register_interruptible(struct device *dev, u8 bank, + u8 reg, u8 bitmask, u8 bitvalues) +{ + struct ab3550 *ab; + struct platform_device *pdev = to_platform_device(dev); + + if ((AB3550_NUM_BANKS <= bank) || + !reg_write_allowed(&ab3550_reg_ranges[pdev->id][bank], reg)) + return -EINVAL; + + ab = dev_get_drvdata(dev->parent); + return mask_and_set_register_interruptible(ab, bank, reg, + bitmask, bitvalues); +} + +int ab3550_set_register_interruptible(struct device *dev, u8 bank, u8 reg, + u8 value) +{ + return ab3550_mask_and_set_register_interruptible(dev, bank, reg, 0xFF, + value); +} + +int ab3550_get_register_interruptible(struct device *dev, u8 bank, u8 reg, + u8 *value) +{ + struct ab3550 *ab; + struct platform_device *pdev = to_platform_device(dev); + + if ((AB3550_NUM_BANKS <= bank) || + !reg_read_allowed(&ab3550_reg_ranges[pdev->id][bank], reg)) + return -EINVAL; + + ab = dev_get_drvdata(dev->parent); + return get_register_interruptible(ab, bank, reg, value); +} + +int ab3550_get_register_page_interruptible(struct device *dev, u8 bank, + u8 first_reg, u8 *regvals, u8 numregs) +{ + struct ab3550 *ab; + struct platform_device *pdev = to_platform_device(dev); + + if ((AB3550_NUM_BANKS <= bank) || + !page_read_allowed(&ab3550_reg_ranges[pdev->id][bank], + first_reg, (first_reg + numregs - 1))) + return -EINVAL; + + ab = dev_get_drvdata(dev->parent); + return get_register_page_interruptible(ab, bank, first_reg, regvals, + numregs); +} + +int ab3550_event_registers_startup_state_get(struct device *dev, u8 *event) +{ + struct ab3550 *ab; + + ab = dev_get_drvdata(dev->parent); + if (!ab->startup_events_read) + return -EAGAIN; /* Try again later */ + + memcpy(event, ab->startup_events, AB3550_NUM_EVENT_REG); + return 0; +} + +int ab3550_startup_irq_enabled(struct device *dev, unsigned int irq) +{ + struct ab3550 *ab; + struct ab3550_platform_data *plf_data; + bool val; + + ab = get_irq_chip_data(irq); + plf_data = ab->i2c_client[0]->dev.platform_data; + irq -= plf_data->irq.base; + val = ((ab->startup_events[irq / 8] & BIT(irq % 8)) != 0); + + return val; +} + +static struct abx500_ops ab3550_ops = { + .get_chip_id = ab3550_get_chip_id, + .get_register = ab3550_get_register_interruptible, + .set_register = ab3550_set_register_interruptible, + .get_register_page = ab3550_get_register_page_interruptible, + .set_register_page = NULL, + .mask_and_set_register = ab3550_mask_and_set_register_interruptible, + .event_registers_startup_state_get = + ab3550_event_registers_startup_state_get, + .startup_irq_enabled = ab3550_startup_irq_enabled, +}; + +static irqreturn_t ab3550_irq_handler(int irq, void *data) +{ + struct ab3550 *ab = data; + int err; + unsigned int i; + u8 e[AB3550_NUM_EVENT_REG]; + u8 *events; + unsigned long flags; + + events = (ab->startup_events_read ? e : ab->startup_events); + + err = get_register_page_interruptible(ab, AB3550_EVENT_BANK, + AB3550_EVENT_REG, events, AB3550_NUM_EVENT_REG); + if (err) + goto err_event_rd; + + if (!ab->startup_events_read) { + dev_info(&ab->i2c_client[0]->dev, + "startup events 0x%x,0x%x,0x%x,0x%x,0x%x\n", + ab->startup_events[0], ab->startup_events[1], + ab->startup_events[2], ab->startup_events[3], + ab->startup_events[4]); + ab->startup_events_read = true; + goto out; + } + + /* The two highest bits in event[4] are not used. */ + events[4] &= 0x3f; + + spin_lock_irqsave(&ab->event_lock, flags); + for (i = 0; i < AB3550_NUM_EVENT_REG; i++) + events[i] &= ~ab->event_mask[i]; + spin_unlock_irqrestore(&ab->event_lock, flags); + + for (i = 0; i < AB3550_NUM_EVENT_REG; i++) { + u8 bit; + u8 event_reg; + + dev_dbg(&ab->i2c_client[0]->dev, "IRQ Event[%d]: 0x%2x\n", + i, events[i]); + + event_reg = events[i]; + for (bit = 0; event_reg; bit++, event_reg /= 2) { + if (event_reg % 2) { + unsigned int irq; + struct ab3550_platform_data *plf_data; + + plf_data = ab->i2c_client[0]->dev.platform_data; + irq = plf_data->irq.base + (i * 8) + bit; + handle_nested_irq(irq); + } + } + } +out: + return IRQ_HANDLED; + +err_event_rd: + dev_dbg(&ab->i2c_client[0]->dev, "error reading event registers\n"); + return IRQ_HANDLED; +} + +#ifdef CONFIG_DEBUG_FS +static struct ab3550_reg_ranges debug_ranges[AB3550_NUM_BANKS] = { + { + .count = 6, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x00, + .last = 0x0e, + }, + { + .first = 0x10, + .last = 0x1a, + }, + { + .first = 0x1e, + .last = 0x4f, + }, + { + .first = 0x51, + .last = 0x63, + }, + { + .first = 0x65, + .last = 0xa3, + }, + { + .first = 0xa5, + .last = 0xa8, + }, + } + }, + { + .count = 8, + .range = (struct ab3550_reg_range[]) { + { + .first = 0x00, + .last = 0x0e, + }, + { + .first = 0x10, + .last = 0x17, + }, + { + .first = 0x1a, + .last = 0x1c, + }, + { + .first = 0x20, + .last = 0x56, + }, + { + .first = 0x5a, + .last = 0x88, + }, + { + .first = 0x8a, + .last = 0xad, + }, + { + .first = 0xb0, + .last = 0xba, + }, + { + .first = 0xbc, + .last = 0xc3, + }, + } + }, +}; + +static int ab3550_registers_print(struct seq_file *s, void *p) +{ + struct ab3550 *ab = s->private; + int bank; + + seq_printf(s, AB3550_NAME_STRING " register values:\n"); + + for (bank = 0; bank < AB3550_NUM_BANKS; bank++) { + unsigned int i; + + seq_printf(s, " bank %d:\n", bank); + for (i = 0; i < debug_ranges[bank].count; i++) { + u8 reg; + + for (reg = debug_ranges[bank].range[i].first; + reg <= debug_ranges[bank].range[i].last; + reg++) { + u8 value; + + get_register_interruptible(ab, bank, reg, + &value); + seq_printf(s, " [%d/0x%02X]: 0x%02X\n", bank, + reg, value); + } + } + } + return 0; +} + +static int ab3550_registers_open(struct inode *inode, struct file *file) +{ + return single_open(file, ab3550_registers_print, inode->i_private); +} + +static const struct file_operations ab3550_registers_fops = { + .open = ab3550_registers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + +static int ab3550_bank_print(struct seq_file *s, void *p) +{ + struct ab3550 *ab = s->private; + + seq_printf(s, "%d\n", ab->debug_bank); + return 0; +} + +static int ab3550_bank_open(struct inode *inode, struct file *file) +{ + return single_open(file, ab3550_bank_print, inode->i_private); +} + +static ssize_t ab3550_bank_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private; + char buf[32]; + int buf_size; + unsigned long user_bank; + int err; + + /* Get userspace string and assure termination */ + buf_size = min(count, (sizeof(buf) - 1)); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + buf[buf_size] = 0; + + err = strict_strtoul(buf, 0, &user_bank); + if (err) + return -EINVAL; + + if (user_bank >= AB3550_NUM_BANKS) { + dev_err(&ab->i2c_client[0]->dev, + "debugfs error input > number of banks\n"); + return -EINVAL; + } + + ab->debug_bank = user_bank; + + return buf_size; +} + +static int ab3550_address_print(struct seq_file *s, void *p) +{ + struct ab3550 *ab = s->private; + + seq_printf(s, "0x%02X\n", ab->debug_address); + return 0; +} + +static int ab3550_address_open(struct inode *inode, struct file *file) +{ + return single_open(file, ab3550_address_print, inode->i_private); +} + +static ssize_t ab3550_address_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private; + char buf[32]; + int buf_size; + unsigned long user_address; + int err; + + /* Get userspace string and assure termination */ + buf_size = min(count, (sizeof(buf) - 1)); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + buf[buf_size] = 0; + + err = strict_strtoul(buf, 0, &user_address); + if (err) + return -EINVAL; + if (user_address > 0xff) { + dev_err(&ab->i2c_client[0]->dev, + "debugfs error input > 0xff\n"); + return -EINVAL; + } + ab->debug_address = user_address; + return buf_size; +} + +static int ab3550_val_print(struct seq_file *s, void *p) +{ + struct ab3550 *ab = s->private; + int err; + u8 regvalue; + + err = get_register_interruptible(ab, (u8)ab->debug_bank, + (u8)ab->debug_address, ®value); + if (err) + return -EINVAL; + seq_printf(s, "0x%02X\n", regvalue); + + return 0; +} + +static int ab3550_val_open(struct inode *inode, struct file *file) +{ + return single_open(file, ab3550_val_print, inode->i_private); +} + +static ssize_t ab3550_val_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private; + char buf[32]; + int buf_size; + unsigned long user_val; + int err; + u8 regvalue; + + /* Get userspace string and assure termination */ + buf_size = min(count, (sizeof(buf)-1)); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + buf[buf_size] = 0; + + err = strict_strtoul(buf, 0, &user_val); + if (err) + return -EINVAL; + if (user_val > 0xff) { + dev_err(&ab->i2c_client[0]->dev, + "debugfs error input > 0xff\n"); + return -EINVAL; + } + err = mask_and_set_register_interruptible( + ab, (u8)ab->debug_bank, + (u8)ab->debug_address, 0xFF, (u8)user_val); + if (err) + return -EINVAL; + + get_register_interruptible(ab, (u8)ab->debug_bank, + (u8)ab->debug_address, ®value); + if (err) + return -EINVAL; + + return buf_size; +} + +static const struct file_operations ab3550_bank_fops = { + .open = ab3550_bank_open, + .write = ab3550_bank_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + +static const struct file_operations ab3550_address_fops = { + .open = ab3550_address_open, + .write = ab3550_address_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + +static const struct file_operations ab3550_val_fops = { + .open = ab3550_val_open, + .write = ab3550_val_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + +static struct dentry *ab3550_dir; +static struct dentry *ab3550_reg_file; +static struct dentry *ab3550_bank_file; +static struct dentry *ab3550_address_file; +static struct dentry *ab3550_val_file; + +static inline void ab3550_setup_debugfs(struct ab3550 *ab) +{ + ab->debug_bank = 0; + ab->debug_address = 0x00; + + ab3550_dir = debugfs_create_dir(AB3550_NAME_STRING, NULL); + if (!ab3550_dir) + goto exit_no_debugfs; + + ab3550_reg_file = debugfs_create_file("all-registers", + S_IRUGO, ab3550_dir, ab, &ab3550_registers_fops); + if (!ab3550_reg_file) + goto exit_destroy_dir; + + ab3550_bank_file = debugfs_create_file("register-bank", + (S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_bank_fops); + if (!ab3550_bank_file) + goto exit_destroy_reg; + + ab3550_address_file = debugfs_create_file("register-address", + (S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_address_fops); + if (!ab3550_address_file) + goto exit_destroy_bank; + + ab3550_val_file = debugfs_create_file("register-value", + (S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_val_fops); + if (!ab3550_val_file) + goto exit_destroy_address; + + return; + +exit_destroy_address: + debugfs_remove(ab3550_address_file); +exit_destroy_bank: + debugfs_remove(ab3550_bank_file); +exit_destroy_reg: + debugfs_remove(ab3550_reg_file); +exit_destroy_dir: + debugfs_remove(ab3550_dir); +exit_no_debugfs: + dev_err(&ab->i2c_client[0]->dev, "failed to create debugfs entries.\n"); + return; +} + +static inline void ab3550_remove_debugfs(void) +{ + debugfs_remove(ab3550_val_file); + debugfs_remove(ab3550_address_file); + debugfs_remove(ab3550_bank_file); + debugfs_remove(ab3550_reg_file); + debugfs_remove(ab3550_dir); +} + +#else /* !CONFIG_DEBUG_FS */ +static inline void ab3550_setup_debugfs(struct ab3550 *ab) +{ +} +static inline void ab3550_remove_debugfs(void) +{ +} +#endif + +/* + * Basic set-up, datastructure creation/destruction and I2C interface. + * This sets up a default config in the AB3550 chip so that it + * will work as expected. + */ +static int __init ab3550_setup(struct ab3550 *ab) +{ + int err = 0; + int i; + struct ab3550_platform_data *plf_data; + struct abx500_init_settings *settings; + + plf_data = ab->i2c_client[0]->dev.platform_data; + settings = plf_data->init_settings; + + for (i = 0; i < plf_data->init_settings_sz; i++) { + err = mask_and_set_register_interruptible(ab, + settings[i].bank, + settings[i].reg, + 0xFF, settings[i].setting); + if (err) + goto exit_no_setup; + + /* If event mask register update the event mask in ab3550 */ + if ((settings[i].bank == 0) && + (AB3550_IMR1 <= settings[i].reg) && + (settings[i].reg <= AB3550_IMR5)) { + ab->event_mask[settings[i].reg - AB3550_IMR1] = + settings[i].setting; + } + } +exit_no_setup: + return err; +} + +static void ab3550_mask_work(struct work_struct *work) +{ + struct ab3550 *ab = container_of(work, struct ab3550, mask_work); + int i; + unsigned long flags; + u8 mask[AB3550_NUM_EVENT_REG]; + + spin_lock_irqsave(&ab->event_lock, flags); + for (i = 0; i < AB3550_NUM_EVENT_REG; i++) + mask[i] = ab->event_mask[i]; + spin_unlock_irqrestore(&ab->event_lock, flags); + + for (i = 0; i < AB3550_NUM_EVENT_REG; i++) { + int err; + + err = mask_and_set_register_interruptible(ab, 0, + (AB3550_IMR1 + i), ~0, mask[i]); + if (err) + dev_err(&ab->i2c_client[0]->dev, + "ab3550_mask_work failed 0x%x,0x%x\n", + (AB3550_IMR1 + i), mask[i]); + } +} + +static void ab3550_mask(unsigned int irq) +{ + unsigned long flags; + struct ab3550 *ab; + struct ab3550_platform_data *plf_data; + + ab = get_irq_chip_data(irq); + plf_data = ab->i2c_client[0]->dev.platform_data; + irq -= plf_data->irq.base; + + spin_lock_irqsave(&ab->event_lock, flags); + ab->event_mask[irq / 8] |= BIT(irq % 8); + spin_unlock_irqrestore(&ab->event_lock, flags); + + schedule_work(&ab->mask_work); +} + +static void ab3550_unmask(unsigned int irq) +{ + unsigned long flags; + struct ab3550 *ab; + struct ab3550_platform_data *plf_data; + + ab = get_irq_chip_data(irq); + plf_data = ab->i2c_client[0]->dev.platform_data; + irq -= plf_data->irq.base; + + spin_lock_irqsave(&ab->event_lock, flags); + ab->event_mask[irq / 8] &= ~BIT(irq % 8); + spin_unlock_irqrestore(&ab->event_lock, flags); + + schedule_work(&ab->mask_work); +} + +static void noop(unsigned int irq) +{ +} + +static struct irq_chip ab3550_irq_chip = { + .name = "ab3550-core", /* Keep the same name as the request */ + .startup = NULL, /* defaults to enable */ + .shutdown = NULL, /* defaults to disable */ + .enable = NULL, /* defaults to unmask */ + .disable = ab3550_mask, /* No default to mask in chip.c */ + .ack = noop, + .mask = ab3550_mask, + .unmask = ab3550_unmask, + .end = NULL, +}; + +struct ab_family_id { + u8 id; + char *name; +}; + +static const struct ab_family_id ids[] __initdata = { + /* AB3550 */ + { + .id = AB3550_P1A, + .name = "P1A" + }, + /* Terminator */ + { + .id = 0x00, + } +}; + +static int __init ab3550_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ab3550 *ab; + struct ab3550_platform_data *ab3550_plf_data = + client->dev.platform_data; + int err; + int i; + int num_i2c_clients = 0; + + ab = kzalloc(sizeof(struct ab3550), GFP_KERNEL); + if (!ab) { + dev_err(&client->dev, + "could not allocate " AB3550_NAME_STRING " device\n"); + return -ENOMEM; + } + + /* Initialize data structure */ + mutex_init(&ab->access_mutex); + spin_lock_init(&ab->event_lock); + ab->i2c_client[0] = client; + + i2c_set_clientdata(client, ab); + + /* Read chip ID register */ + err = get_register_interruptible(ab, 0, AB3550_CID_REG, &ab->chip_id); + if (err) { + dev_err(&client->dev, "could not communicate with the analog " + "baseband chip\n"); + goto exit_no_detect; + } + + for (i = 0; ids[i].id != 0x0; i++) { + if (ids[i].id == ab->chip_id) { + snprintf(&ab->chip_name[0], sizeof(ab->chip_name) - 1, + AB3550_ID_FORMAT_STRING, ids[i].name); + break; + } + } + + if (ids[i].id == 0x0) { + dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", + ab->chip_id); + dev_err(&client->dev, "driver not started!\n"); + goto exit_no_detect; + } + + dev_info(&client->dev, "detected AB chip: %s\n", &ab->chip_name[0]); + + /* Attach other dummy I2C clients. */ + while (++num_i2c_clients < AB3550_NUM_BANKS) { + ab->i2c_client[num_i2c_clients] = + i2c_new_dummy(client->adapter, + (client->addr + num_i2c_clients)); + if (!ab->i2c_client[num_i2c_clients]) { + err = -ENOMEM; + goto exit_no_dummy_client; + } + strlcpy(ab->i2c_client[num_i2c_clients]->name, id->name, + sizeof(ab->i2c_client[num_i2c_clients]->name)); + } + + err = ab3550_setup(ab); + if (err) + goto exit_no_setup; + + INIT_WORK(&ab->mask_work, ab3550_mask_work); + + for (i = 0; i < ab3550_plf_data->irq.count; i++) { + unsigned int irq; + + irq = ab3550_plf_data->irq.base + i; + set_irq_chip_data(irq, ab); + set_irq_chip_and_handler(irq, &ab3550_irq_chip, + handle_simple_irq); + set_irq_nested_thread(irq, 1); +#ifdef CONFIG_ARM + set_irq_flags(irq, IRQF_VALID); +#else + set_irq_noprobe(irq); +#endif + } + + err = request_threaded_irq(client->irq, NULL, ab3550_irq_handler, + IRQF_ONESHOT, "ab3550-core", ab); + /* This real unpredictable IRQ is of course sampled for entropy */ + rand_initialize_irq(client->irq); + + if (err) + goto exit_no_irq; + + err = abx500_register_ops(&client->dev, &ab3550_ops); + if (err) + goto exit_no_ops; + + /* Set up and register the platform devices. */ + for (i = 0; i < AB3550_NUM_DEVICES; i++) { + ab3550_devs[i].platform_data = ab3550_plf_data->dev_data[i]; + ab3550_devs[i].data_size = ab3550_plf_data->dev_data_sz[i]; + } + + err = mfd_add_devices(&client->dev, 0, ab3550_devs, + ARRAY_SIZE(ab3550_devs), NULL, + ab3550_plf_data->irq.base); + + ab3550_setup_debugfs(ab); + + return 0; + +exit_no_ops: +exit_no_irq: +exit_no_setup: +exit_no_dummy_client: + /* Unregister the dummy i2c clients. */ + while (--num_i2c_clients) + i2c_unregister_device(ab->i2c_client[num_i2c_clients]); +exit_no_detect: + kfree(ab); + return err; +} + +static int __exit ab3550_remove(struct i2c_client *client) +{ + struct ab3550 *ab = i2c_get_clientdata(client); + int num_i2c_clients = AB3550_NUM_BANKS; + + mfd_remove_devices(&client->dev); + ab3550_remove_debugfs(); + + while (--num_i2c_clients) + i2c_unregister_device(ab->i2c_client[num_i2c_clients]); + + /* + * At this point, all subscribers should have unregistered + * their notifiers so deactivate IRQ + */ + free_irq(client->irq, ab); + i2c_set_clientdata(client, NULL); + kfree(ab); + return 0; +} + +static const struct i2c_device_id ab3550_id[] = { + {AB3550_NAME_STRING, 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, ab3550_id); + +static struct i2c_driver ab3550_driver = { + .driver = { + .name = AB3550_NAME_STRING, + .owner = THIS_MODULE, + }, + .id_table = ab3550_id, + .probe = ab3550_probe, + .remove = __exit_p(ab3550_remove), +}; + +static int __init ab3550_i2c_init(void) +{ + return i2c_add_driver(&ab3550_driver); +} + +static void __exit ab3550_i2c_exit(void) +{ + i2c_del_driver(&ab3550_driver); +} + +subsys_initcall(ab3550_i2c_init); +module_exit(ab3550_i2c_exit); + +MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>"); +MODULE_DESCRIPTION("AB3550 core driver"); +MODULE_LICENSE("GPL"); |