| /* |
| * wm831x-core.c -- Device access for Wolfson WM831x PMICs |
| * |
| * Copyright 2009 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * |
| * 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/module.h> |
| #include <linux/i2c.h> |
| #include <linux/bcd.h> |
| #include <linux/delay.h> |
| #include <linux/mfd/core.h> |
| |
| #include <linux/mfd/wm831x/core.h> |
| #include <linux/mfd/wm831x/pdata.h> |
| #include <linux/mfd/wm831x/irq.h> |
| #include <linux/mfd/wm831x/auxadc.h> |
| #include <linux/mfd/wm831x/otp.h> |
| #include <linux/mfd/wm831x/regulator.h> |
| |
| /* Current settings - values are 2*2^(reg_val/4) microamps. These are |
| * exported since they are used by multiple drivers. |
| */ |
| int wm831x_isinkv_values[WM831X_ISINK_MAX_ISEL + 1] = { |
| 2, |
| 2, |
| 3, |
| 3, |
| 4, |
| 5, |
| 6, |
| 7, |
| 8, |
| 10, |
| 11, |
| 13, |
| 16, |
| 19, |
| 23, |
| 27, |
| 32, |
| 38, |
| 45, |
| 54, |
| 64, |
| 76, |
| 91, |
| 108, |
| 128, |
| 152, |
| 181, |
| 215, |
| 256, |
| 304, |
| 362, |
| 431, |
| 512, |
| 609, |
| 724, |
| 861, |
| 1024, |
| 1218, |
| 1448, |
| 1722, |
| 2048, |
| 2435, |
| 2896, |
| 3444, |
| 4096, |
| 4871, |
| 5793, |
| 6889, |
| 8192, |
| 9742, |
| 11585, |
| 13777, |
| 16384, |
| 19484, |
| 23170, |
| 27554, |
| }; |
| EXPORT_SYMBOL_GPL(wm831x_isinkv_values); |
| |
| enum wm831x_parent { |
| WM8310 = 0, |
| WM8311 = 1, |
| WM8312 = 2, |
| }; |
| |
| static int wm831x_reg_locked(struct wm831x *wm831x, unsigned short reg) |
| { |
| if (!wm831x->locked) |
| return 0; |
| |
| switch (reg) { |
| case WM831X_WATCHDOG: |
| case WM831X_DC4_CONTROL: |
| case WM831X_ON_PIN_CONTROL: |
| case WM831X_BACKUP_CHARGER_CONTROL: |
| case WM831X_CHARGER_CONTROL_1: |
| case WM831X_CHARGER_CONTROL_2: |
| return 1; |
| |
| default: |
| return 0; |
| } |
| } |
| |
| /** |
| * wm831x_reg_unlock: Unlock user keyed registers |
| * |
| * The WM831x has a user key preventing writes to particularly |
| * critical registers. This function locks those registers, |
| * allowing writes to them. |
| */ |
| void wm831x_reg_lock(struct wm831x *wm831x) |
| { |
| int ret; |
| |
| ret = wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0); |
| if (ret == 0) { |
| dev_vdbg(wm831x->dev, "Registers locked\n"); |
| |
| mutex_lock(&wm831x->io_lock); |
| WARN_ON(wm831x->locked); |
| wm831x->locked = 1; |
| mutex_unlock(&wm831x->io_lock); |
| } else { |
| dev_err(wm831x->dev, "Failed to lock registers: %d\n", ret); |
| } |
| |
| } |
| EXPORT_SYMBOL_GPL(wm831x_reg_lock); |
| |
| /** |
| * wm831x_reg_unlock: Unlock user keyed registers |
| * |
| * The WM831x has a user key preventing writes to particularly |
| * critical registers. This function locks those registers, |
| * preventing spurious writes. |
| */ |
| int wm831x_reg_unlock(struct wm831x *wm831x) |
| { |
| int ret; |
| |
| /* 0x9716 is the value required to unlock the registers */ |
| ret = wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0x9716); |
| if (ret == 0) { |
| dev_vdbg(wm831x->dev, "Registers unlocked\n"); |
| |
| mutex_lock(&wm831x->io_lock); |
| WARN_ON(!wm831x->locked); |
| wm831x->locked = 0; |
| mutex_unlock(&wm831x->io_lock); |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_reg_unlock); |
| |
| static int wm831x_read(struct wm831x *wm831x, unsigned short reg, |
| int bytes, void *dest) |
| { |
| int ret, i; |
| u16 *buf = dest; |
| |
| BUG_ON(bytes % 2); |
| BUG_ON(bytes <= 0); |
| |
| ret = wm831x->read_dev(wm831x, reg, bytes, dest); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < bytes / 2; i++) { |
| buf[i] = be16_to_cpu(buf[i]); |
| |
| dev_vdbg(wm831x->dev, "Read %04x from R%d(0x%x)\n", |
| buf[i], reg + i, reg + i); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * wm831x_reg_read: Read a single WM831x register. |
| * |
| * @wm831x: Device to read from. |
| * @reg: Register to read. |
| */ |
| int wm831x_reg_read(struct wm831x *wm831x, unsigned short reg) |
| { |
| unsigned short val; |
| int ret; |
| |
| mutex_lock(&wm831x->io_lock); |
| |
| ret = wm831x_read(wm831x, reg, 2, &val); |
| |
| mutex_unlock(&wm831x->io_lock); |
| |
| if (ret < 0) |
| return ret; |
| else |
| return val; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_reg_read); |
| |
| /** |
| * wm831x_bulk_read: Read multiple WM831x registers |
| * |
| * @wm831x: Device to read from |
| * @reg: First register |
| * @count: Number of registers |
| * @buf: Buffer to fill. |
| */ |
| int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg, |
| int count, u16 *buf) |
| { |
| int ret; |
| |
| mutex_lock(&wm831x->io_lock); |
| |
| ret = wm831x_read(wm831x, reg, count * 2, buf); |
| |
| mutex_unlock(&wm831x->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_bulk_read); |
| |
| static int wm831x_write(struct wm831x *wm831x, unsigned short reg, |
| int bytes, void *src) |
| { |
| u16 *buf = src; |
| int i; |
| |
| BUG_ON(bytes % 2); |
| BUG_ON(bytes <= 0); |
| |
| for (i = 0; i < bytes / 2; i++) { |
| if (wm831x_reg_locked(wm831x, reg)) |
| return -EPERM; |
| |
| dev_vdbg(wm831x->dev, "Write %04x to R%d(0x%x)\n", |
| buf[i], reg + i, reg + i); |
| |
| buf[i] = cpu_to_be16(buf[i]); |
| } |
| |
| return wm831x->write_dev(wm831x, reg, bytes, src); |
| } |
| |
| /** |
| * wm831x_reg_write: Write a single WM831x register. |
| * |
| * @wm831x: Device to write to. |
| * @reg: Register to write to. |
| * @val: Value to write. |
| */ |
| int wm831x_reg_write(struct wm831x *wm831x, unsigned short reg, |
| unsigned short val) |
| { |
| int ret; |
| |
| mutex_lock(&wm831x->io_lock); |
| |
| ret = wm831x_write(wm831x, reg, 2, &val); |
| |
| mutex_unlock(&wm831x->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_reg_write); |
| |
| /** |
| * wm831x_set_bits: Set the value of a bitfield in a WM831x register |
| * |
| * @wm831x: Device to write to. |
| * @reg: Register to write to. |
| * @mask: Mask of bits to set. |
| * @val: Value to set (unshifted) |
| */ |
| int wm831x_set_bits(struct wm831x *wm831x, unsigned short reg, |
| unsigned short mask, unsigned short val) |
| { |
| int ret; |
| u16 r; |
| |
| mutex_lock(&wm831x->io_lock); |
| |
| ret = wm831x_read(wm831x, reg, 2, &r); |
| if (ret < 0) |
| goto out; |
| |
| r &= ~mask; |
| r |= val; |
| |
| ret = wm831x_write(wm831x, reg, 2, &r); |
| |
| out: |
| mutex_unlock(&wm831x->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_set_bits); |
| |
| /** |
| * wm831x_auxadc_read: Read a value from the WM831x AUXADC |
| * |
| * @wm831x: Device to read from. |
| * @input: AUXADC input to read. |
| */ |
| int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input) |
| { |
| int tries = 10; |
| int ret, src; |
| |
| mutex_lock(&wm831x->auxadc_lock); |
| |
| ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, |
| WM831X_AUX_ENA, WM831X_AUX_ENA); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret); |
| goto out; |
| } |
| |
| /* We force a single source at present */ |
| src = input; |
| ret = wm831x_reg_write(wm831x, WM831X_AUXADC_SOURCE, |
| 1 << src); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret); |
| goto out; |
| } |
| |
| ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, |
| WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret); |
| goto disable; |
| } |
| |
| do { |
| msleep(1); |
| |
| ret = wm831x_reg_read(wm831x, WM831X_AUXADC_CONTROL); |
| if (ret < 0) |
| ret = WM831X_AUX_CVT_ENA; |
| } while ((ret & WM831X_AUX_CVT_ENA) && --tries); |
| |
| if (ret & WM831X_AUX_CVT_ENA) { |
| dev_err(wm831x->dev, "Timed out reading AUXADC\n"); |
| ret = -EBUSY; |
| goto disable; |
| } |
| |
| ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to read AUXADC data: %d\n", ret); |
| } else { |
| src = ((ret & WM831X_AUX_DATA_SRC_MASK) |
| >> WM831X_AUX_DATA_SRC_SHIFT) - 1; |
| |
| if (src == 14) |
| src = WM831X_AUX_CAL; |
| |
| if (src != input) { |
| dev_err(wm831x->dev, "Data from source %d not %d\n", |
| src, input); |
| ret = -EINVAL; |
| } else { |
| ret &= WM831X_AUX_DATA_MASK; |
| } |
| } |
| |
| disable: |
| wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_ENA, 0); |
| out: |
| mutex_unlock(&wm831x->auxadc_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_auxadc_read); |
| |
| /** |
| * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC |
| * |
| * @wm831x: Device to read from. |
| * @input: AUXADC input to read. |
| */ |
| int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input) |
| { |
| int ret; |
| |
| ret = wm831x_auxadc_read(wm831x, input); |
| if (ret < 0) |
| return ret; |
| |
| ret *= 1465; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm831x_auxadc_read_uv); |
| |
| static struct resource wm831x_dcdc1_resources[] = { |
| { |
| .start = WM831X_DC1_CONTROL_1, |
| .end = WM831X_DC1_DVS_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_DC1, |
| .end = WM831X_IRQ_UV_DC1, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "HC", |
| .start = WM831X_IRQ_HC_DC1, |
| .end = WM831X_IRQ_HC_DC1, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| |
| static struct resource wm831x_dcdc2_resources[] = { |
| { |
| .start = WM831X_DC2_CONTROL_1, |
| .end = WM831X_DC2_DVS_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_DC2, |
| .end = WM831X_IRQ_UV_DC2, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "HC", |
| .start = WM831X_IRQ_HC_DC2, |
| .end = WM831X_IRQ_HC_DC2, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_dcdc3_resources[] = { |
| { |
| .start = WM831X_DC3_CONTROL_1, |
| .end = WM831X_DC3_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_DC3, |
| .end = WM831X_IRQ_UV_DC3, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_dcdc4_resources[] = { |
| { |
| .start = WM831X_DC4_CONTROL, |
| .end = WM831X_DC4_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_DC4, |
| .end = WM831X_IRQ_UV_DC4, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_gpio_resources[] = { |
| { |
| .start = WM831X_IRQ_GPIO_1, |
| .end = WM831X_IRQ_GPIO_16, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_isink1_resources[] = { |
| { |
| .start = WM831X_CURRENT_SINK_1, |
| .end = WM831X_CURRENT_SINK_1, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .start = WM831X_IRQ_CS1, |
| .end = WM831X_IRQ_CS1, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_isink2_resources[] = { |
| { |
| .start = WM831X_CURRENT_SINK_2, |
| .end = WM831X_CURRENT_SINK_2, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .start = WM831X_IRQ_CS2, |
| .end = WM831X_IRQ_CS2, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo1_resources[] = { |
| { |
| .start = WM831X_LDO1_CONTROL, |
| .end = WM831X_LDO1_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO1, |
| .end = WM831X_IRQ_UV_LDO1, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo2_resources[] = { |
| { |
| .start = WM831X_LDO2_CONTROL, |
| .end = WM831X_LDO2_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO2, |
| .end = WM831X_IRQ_UV_LDO2, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo3_resources[] = { |
| { |
| .start = WM831X_LDO3_CONTROL, |
| .end = WM831X_LDO3_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO3, |
| .end = WM831X_IRQ_UV_LDO3, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo4_resources[] = { |
| { |
| .start = WM831X_LDO4_CONTROL, |
| .end = WM831X_LDO4_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO4, |
| .end = WM831X_IRQ_UV_LDO4, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo5_resources[] = { |
| { |
| .start = WM831X_LDO5_CONTROL, |
| .end = WM831X_LDO5_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO5, |
| .end = WM831X_IRQ_UV_LDO5, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo6_resources[] = { |
| { |
| .start = WM831X_LDO6_CONTROL, |
| .end = WM831X_LDO6_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO6, |
| .end = WM831X_IRQ_UV_LDO6, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo7_resources[] = { |
| { |
| .start = WM831X_LDO7_CONTROL, |
| .end = WM831X_LDO7_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO7, |
| .end = WM831X_IRQ_UV_LDO7, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo8_resources[] = { |
| { |
| .start = WM831X_LDO8_CONTROL, |
| .end = WM831X_LDO8_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO8, |
| .end = WM831X_IRQ_UV_LDO8, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo9_resources[] = { |
| { |
| .start = WM831X_LDO9_CONTROL, |
| .end = WM831X_LDO9_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO9, |
| .end = WM831X_IRQ_UV_LDO9, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo10_resources[] = { |
| { |
| .start = WM831X_LDO10_CONTROL, |
| .end = WM831X_LDO10_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| { |
| .name = "UV", |
| .start = WM831X_IRQ_UV_LDO10, |
| .end = WM831X_IRQ_UV_LDO10, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_ldo11_resources[] = { |
| { |
| .start = WM831X_LDO11_ON_CONTROL, |
| .end = WM831X_LDO11_SLEEP_CONTROL, |
| .flags = IORESOURCE_IO, |
| }, |
| }; |
| |
| static struct resource wm831x_on_resources[] = { |
| { |
| .start = WM831X_IRQ_ON, |
| .end = WM831X_IRQ_ON, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| |
| static struct resource wm831x_power_resources[] = { |
| { |
| .name = "SYSLO", |
| .start = WM831X_IRQ_PPM_SYSLO, |
| .end = WM831X_IRQ_PPM_SYSLO, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "PWR SRC", |
| .start = WM831X_IRQ_PPM_PWR_SRC, |
| .end = WM831X_IRQ_PPM_PWR_SRC, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "USB CURR", |
| .start = WM831X_IRQ_PPM_USB_CURR, |
| .end = WM831X_IRQ_PPM_USB_CURR, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "BATT HOT", |
| .start = WM831X_IRQ_CHG_BATT_HOT, |
| .end = WM831X_IRQ_CHG_BATT_HOT, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "BATT COLD", |
| .start = WM831X_IRQ_CHG_BATT_COLD, |
| .end = WM831X_IRQ_CHG_BATT_COLD, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "BATT FAIL", |
| .start = WM831X_IRQ_CHG_BATT_FAIL, |
| .end = WM831X_IRQ_CHG_BATT_FAIL, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "OV", |
| .start = WM831X_IRQ_CHG_OV, |
| .end = WM831X_IRQ_CHG_OV, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "END", |
| .start = WM831X_IRQ_CHG_END, |
| .end = WM831X_IRQ_CHG_END, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "TO", |
| .start = WM831X_IRQ_CHG_TO, |
| .end = WM831X_IRQ_CHG_TO, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "MODE", |
| .start = WM831X_IRQ_CHG_MODE, |
| .end = WM831X_IRQ_CHG_MODE, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "START", |
| .start = WM831X_IRQ_CHG_START, |
| .end = WM831X_IRQ_CHG_START, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_rtc_resources[] = { |
| { |
| .name = "PER", |
| .start = WM831X_IRQ_RTC_PER, |
| .end = WM831X_IRQ_RTC_PER, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "ALM", |
| .start = WM831X_IRQ_RTC_ALM, |
| .end = WM831X_IRQ_RTC_ALM, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_status1_resources[] = { |
| { |
| .start = WM831X_STATUS_LED_1, |
| .end = WM831X_STATUS_LED_1, |
| .flags = IORESOURCE_IO, |
| }, |
| }; |
| |
| static struct resource wm831x_status2_resources[] = { |
| { |
| .start = WM831X_STATUS_LED_2, |
| .end = WM831X_STATUS_LED_2, |
| .flags = IORESOURCE_IO, |
| }, |
| }; |
| |
| static struct resource wm831x_touch_resources[] = { |
| { |
| .name = "TCHPD", |
| .start = WM831X_IRQ_TCHPD, |
| .end = WM831X_IRQ_TCHPD, |
| .flags = IORESOURCE_IRQ, |
| }, |
| { |
| .name = "TCHDATA", |
| .start = WM831X_IRQ_TCHDATA, |
| .end = WM831X_IRQ_TCHDATA, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct resource wm831x_wdt_resources[] = { |
| { |
| .start = WM831X_IRQ_WDOG_TO, |
| .end = WM831X_IRQ_WDOG_TO, |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static struct mfd_cell wm8310_devs[] = { |
| { |
| .name = "wm831x-buckv", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources), |
| .resources = wm831x_dcdc1_resources, |
| }, |
| { |
| .name = "wm831x-buckv", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources), |
| .resources = wm831x_dcdc2_resources, |
| }, |
| { |
| .name = "wm831x-buckp", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources), |
| .resources = wm831x_dcdc3_resources, |
| }, |
| { |
| .name = "wm831x-boostp", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources), |
| .resources = wm831x_dcdc4_resources, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 1, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 2, |
| }, |
| { |
| .name = "wm831x-gpio", |
| .num_resources = ARRAY_SIZE(wm831x_gpio_resources), |
| .resources = wm831x_gpio_resources, |
| }, |
| { |
| .name = "wm831x-hwmon", |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_isink1_resources), |
| .resources = wm831x_isink1_resources, |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_isink2_resources), |
| .resources = wm831x_isink2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_ldo1_resources), |
| .resources = wm831x_ldo1_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_ldo2_resources), |
| .resources = wm831x_ldo2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_ldo3_resources), |
| .resources = wm831x_ldo3_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_ldo4_resources), |
| .resources = wm831x_ldo4_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 5, |
| .num_resources = ARRAY_SIZE(wm831x_ldo5_resources), |
| .resources = wm831x_ldo5_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 6, |
| .num_resources = ARRAY_SIZE(wm831x_ldo6_resources), |
| .resources = wm831x_ldo6_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 7, |
| .num_resources = ARRAY_SIZE(wm831x_ldo7_resources), |
| .resources = wm831x_ldo7_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 8, |
| .num_resources = ARRAY_SIZE(wm831x_ldo8_resources), |
| .resources = wm831x_ldo8_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 9, |
| .num_resources = ARRAY_SIZE(wm831x_ldo9_resources), |
| .resources = wm831x_ldo9_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 10, |
| .num_resources = ARRAY_SIZE(wm831x_ldo10_resources), |
| .resources = wm831x_ldo10_resources, |
| }, |
| { |
| .name = "wm831x-alive-ldo", |
| .id = 11, |
| .num_resources = ARRAY_SIZE(wm831x_ldo11_resources), |
| .resources = wm831x_ldo11_resources, |
| }, |
| { |
| .name = "wm831x-on", |
| .num_resources = ARRAY_SIZE(wm831x_on_resources), |
| .resources = wm831x_on_resources, |
| }, |
| { |
| .name = "wm831x-power", |
| .num_resources = ARRAY_SIZE(wm831x_power_resources), |
| .resources = wm831x_power_resources, |
| }, |
| { |
| .name = "wm831x-rtc", |
| .num_resources = ARRAY_SIZE(wm831x_rtc_resources), |
| .resources = wm831x_rtc_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_status1_resources), |
| .resources = wm831x_status1_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_status2_resources), |
| .resources = wm831x_status2_resources, |
| }, |
| { |
| .name = "wm831x-watchdog", |
| .num_resources = ARRAY_SIZE(wm831x_wdt_resources), |
| .resources = wm831x_wdt_resources, |
| }, |
| }; |
| |
| static struct mfd_cell wm8311_devs[] = { |
| { |
| .name = "wm831x-buckv", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources), |
| .resources = wm831x_dcdc1_resources, |
| }, |
| { |
| .name = "wm831x-buckv", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources), |
| .resources = wm831x_dcdc2_resources, |
| }, |
| { |
| .name = "wm831x-buckp", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources), |
| .resources = wm831x_dcdc3_resources, |
| }, |
| { |
| .name = "wm831x-boostp", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources), |
| .resources = wm831x_dcdc4_resources, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 1, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 2, |
| }, |
| { |
| .name = "wm831x-gpio", |
| .num_resources = ARRAY_SIZE(wm831x_gpio_resources), |
| .resources = wm831x_gpio_resources, |
| }, |
| { |
| .name = "wm831x-hwmon", |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_isink1_resources), |
| .resources = wm831x_isink1_resources, |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_isink2_resources), |
| .resources = wm831x_isink2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_ldo1_resources), |
| .resources = wm831x_ldo1_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_ldo2_resources), |
| .resources = wm831x_ldo2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_ldo3_resources), |
| .resources = wm831x_ldo3_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_ldo4_resources), |
| .resources = wm831x_ldo4_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 5, |
| .num_resources = ARRAY_SIZE(wm831x_ldo5_resources), |
| .resources = wm831x_ldo5_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 7, |
| .num_resources = ARRAY_SIZE(wm831x_ldo7_resources), |
| .resources = wm831x_ldo7_resources, |
| }, |
| { |
| .name = "wm831x-alive-ldo", |
| .id = 11, |
| .num_resources = ARRAY_SIZE(wm831x_ldo11_resources), |
| .resources = wm831x_ldo11_resources, |
| }, |
| { |
| .name = "wm831x-on", |
| .num_resources = ARRAY_SIZE(wm831x_on_resources), |
| .resources = wm831x_on_resources, |
| }, |
| { |
| .name = "wm831x-power", |
| .num_resources = ARRAY_SIZE(wm831x_power_resources), |
| .resources = wm831x_power_resources, |
| }, |
| { |
| .name = "wm831x-rtc", |
| .num_resources = ARRAY_SIZE(wm831x_rtc_resources), |
| .resources = wm831x_rtc_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_status1_resources), |
| .resources = wm831x_status1_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_status2_resources), |
| .resources = wm831x_status2_resources, |
| }, |
| { |
| .name = "wm831x-touch", |
| .num_resources = ARRAY_SIZE(wm831x_touch_resources), |
| .resources = wm831x_touch_resources, |
| }, |
| { |
| .name = "wm831x-watchdog", |
| .num_resources = ARRAY_SIZE(wm831x_wdt_resources), |
| .resources = wm831x_wdt_resources, |
| }, |
| }; |
| |
| static struct mfd_cell wm8312_devs[] = { |
| { |
| .name = "wm831x-buckv", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources), |
| .resources = wm831x_dcdc1_resources, |
| }, |
| { |
| .name = "wm831x-buckv", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources), |
| .resources = wm831x_dcdc2_resources, |
| }, |
| { |
| .name = "wm831x-buckp", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources), |
| .resources = wm831x_dcdc3_resources, |
| }, |
| { |
| .name = "wm831x-boostp", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources), |
| .resources = wm831x_dcdc4_resources, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 1, |
| }, |
| { |
| .name = "wm831x-epe", |
| .id = 2, |
| }, |
| { |
| .name = "wm831x-gpio", |
| .num_resources = ARRAY_SIZE(wm831x_gpio_resources), |
| .resources = wm831x_gpio_resources, |
| }, |
| { |
| .name = "wm831x-hwmon", |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_isink1_resources), |
| .resources = wm831x_isink1_resources, |
| }, |
| { |
| .name = "wm831x-isink", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_isink2_resources), |
| .resources = wm831x_isink2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_ldo1_resources), |
| .resources = wm831x_ldo1_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_ldo2_resources), |
| .resources = wm831x_ldo2_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 3, |
| .num_resources = ARRAY_SIZE(wm831x_ldo3_resources), |
| .resources = wm831x_ldo3_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 4, |
| .num_resources = ARRAY_SIZE(wm831x_ldo4_resources), |
| .resources = wm831x_ldo4_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 5, |
| .num_resources = ARRAY_SIZE(wm831x_ldo5_resources), |
| .resources = wm831x_ldo5_resources, |
| }, |
| { |
| .name = "wm831x-ldo", |
| .id = 6, |
| .num_resources = ARRAY_SIZE(wm831x_ldo6_resources), |
| .resources = wm831x_ldo6_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 7, |
| .num_resources = ARRAY_SIZE(wm831x_ldo7_resources), |
| .resources = wm831x_ldo7_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 8, |
| .num_resources = ARRAY_SIZE(wm831x_ldo8_resources), |
| .resources = wm831x_ldo8_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 9, |
| .num_resources = ARRAY_SIZE(wm831x_ldo9_resources), |
| .resources = wm831x_ldo9_resources, |
| }, |
| { |
| .name = "wm831x-aldo", |
| .id = 10, |
| .num_resources = ARRAY_SIZE(wm831x_ldo10_resources), |
| .resources = wm831x_ldo10_resources, |
| }, |
| { |
| .name = "wm831x-alive-ldo", |
| .id = 11, |
| .num_resources = ARRAY_SIZE(wm831x_ldo11_resources), |
| .resources = wm831x_ldo11_resources, |
| }, |
| { |
| .name = "wm831x-on", |
| .num_resources = ARRAY_SIZE(wm831x_on_resources), |
| .resources = wm831x_on_resources, |
| }, |
| { |
| .name = "wm831x-power", |
| .num_resources = ARRAY_SIZE(wm831x_power_resources), |
| .resources = wm831x_power_resources, |
| }, |
| { |
| .name = "wm831x-rtc", |
| .num_resources = ARRAY_SIZE(wm831x_rtc_resources), |
| .resources = wm831x_rtc_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 1, |
| .num_resources = ARRAY_SIZE(wm831x_status1_resources), |
| .resources = wm831x_status1_resources, |
| }, |
| { |
| .name = "wm831x-status", |
| .id = 2, |
| .num_resources = ARRAY_SIZE(wm831x_status2_resources), |
| .resources = wm831x_status2_resources, |
| }, |
| { |
| .name = "wm831x-touch", |
| .num_resources = ARRAY_SIZE(wm831x_touch_resources), |
| .resources = wm831x_touch_resources, |
| }, |
| { |
| .name = "wm831x-watchdog", |
| .num_resources = ARRAY_SIZE(wm831x_wdt_resources), |
| .resources = wm831x_wdt_resources, |
| }, |
| }; |
| |
| static struct mfd_cell backlight_devs[] = { |
| { |
| .name = "wm831x-backlight", |
| }, |
| }; |
| |
| /* |
| * Instantiate the generic non-control parts of the device. |
| */ |
| static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) |
| { |
| struct wm831x_pdata *pdata = wm831x->dev->platform_data; |
| int rev; |
| enum wm831x_parent parent; |
| int ret; |
| |
| mutex_init(&wm831x->io_lock); |
| mutex_init(&wm831x->key_lock); |
| mutex_init(&wm831x->auxadc_lock); |
| dev_set_drvdata(wm831x->dev, wm831x); |
| |
| ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to read parent ID: %d\n", ret); |
| goto err; |
| } |
| if (ret != 0x6204) { |
| dev_err(wm831x->dev, "Device is not a WM831x: ID %x\n", ret); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| ret = wm831x_reg_read(wm831x, WM831X_REVISION); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to read revision: %d\n", ret); |
| goto err; |
| } |
| rev = (ret & WM831X_PARENT_REV_MASK) >> WM831X_PARENT_REV_SHIFT; |
| |
| ret = wm831x_reg_read(wm831x, WM831X_RESET_ID); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to read device ID: %d\n", ret); |
| goto err; |
| } |
| |
| switch (ret) { |
| case 0x8310: |
| parent = WM8310; |
| switch (rev) { |
| case 0: |
| dev_info(wm831x->dev, "WM8310 revision %c\n", |
| 'A' + rev); |
| break; |
| } |
| break; |
| |
| case 0x8311: |
| parent = WM8311; |
| switch (rev) { |
| case 0: |
| dev_info(wm831x->dev, "WM8311 revision %c\n", |
| 'A' + rev); |
| break; |
| } |
| break; |
| |
| case 0x8312: |
| parent = WM8312; |
| switch (rev) { |
| case 0: |
| dev_info(wm831x->dev, "WM8312 revision %c\n", |
| 'A' + rev); |
| break; |
| } |
| break; |
| |
| case 0: |
| /* Some engineering samples do not have the ID set, |
| * rely on the device being registered correctly. |
| * This will need revisiting for future devices with |
| * multiple dies. |
| */ |
| parent = id; |
| switch (rev) { |
| case 0: |
| dev_info(wm831x->dev, "WM831%d ES revision %c\n", |
| parent, 'A' + rev); |
| break; |
| } |
| break; |
| |
| default: |
| dev_err(wm831x->dev, "Unknown WM831x device %04x\n", ret); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| /* This will need revisiting in future but is OK for all |
| * current parts. |
| */ |
| if (parent != id) |
| dev_warn(wm831x->dev, "Device was registered as a WM831%lu\n", |
| id); |
| |
| /* Bootstrap the user key */ |
| ret = wm831x_reg_read(wm831x, WM831X_SECURITY_KEY); |
| if (ret < 0) { |
| dev_err(wm831x->dev, "Failed to read security key: %d\n", ret); |
| goto err; |
| } |
| if (ret != 0) { |
| dev_warn(wm831x->dev, "Security key had non-zero value %x\n", |
| ret); |
| wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0); |
| } |
| wm831x->locked = 1; |
| |
| if (pdata && pdata->pre_init) { |
| ret = pdata->pre_init(wm831x); |
| if (ret != 0) { |
| dev_err(wm831x->dev, "pre_init() failed: %d\n", ret); |
| goto err; |
| } |
| } |
| |
| ret = wm831x_irq_init(wm831x, irq); |
| if (ret != 0) |
| goto err; |
| |
| /* The core device is up, instantiate the subdevices. */ |
| switch (parent) { |
| case WM8310: |
| ret = mfd_add_devices(wm831x->dev, -1, |
| wm8310_devs, ARRAY_SIZE(wm8310_devs), |
| NULL, 0); |
| break; |
| |
| case WM8311: |
| ret = mfd_add_devices(wm831x->dev, -1, |
| wm8311_devs, ARRAY_SIZE(wm8311_devs), |
| NULL, 0); |
| break; |
| |
| case WM8312: |
| ret = mfd_add_devices(wm831x->dev, -1, |
| wm8312_devs, ARRAY_SIZE(wm8312_devs), |
| NULL, 0); |
| break; |
| |
| default: |
| /* If this happens the bus probe function is buggy */ |
| BUG(); |
| } |
| |
| if (ret != 0) { |
| dev_err(wm831x->dev, "Failed to add children\n"); |
| goto err_irq; |
| } |
| |
| if (pdata && pdata->backlight) { |
| /* Treat errors as non-critical */ |
| ret = mfd_add_devices(wm831x->dev, -1, backlight_devs, |
| ARRAY_SIZE(backlight_devs), NULL, 0); |
| if (ret < 0) |
| dev_err(wm831x->dev, "Failed to add backlight: %d\n", |
| ret); |
| } |
| |
| wm831x_otp_init(wm831x); |
| |
| if (pdata && pdata->post_init) { |
| ret = pdata->post_init(wm831x); |
| if (ret != 0) { |
| dev_err(wm831x->dev, "post_init() failed: %d\n", ret); |
| goto err_irq; |
| } |
| } |
| |
| return 0; |
| |
| err_irq: |
| wm831x_irq_exit(wm831x); |
| err: |
| mfd_remove_devices(wm831x->dev); |
| kfree(wm831x); |
| return ret; |
| } |
| |
| static void wm831x_device_exit(struct wm831x *wm831x) |
| { |
| wm831x_otp_exit(wm831x); |
| mfd_remove_devices(wm831x->dev); |
| wm831x_irq_exit(wm831x); |
| kfree(wm831x); |
| } |
| |
| static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg, |
| int bytes, void *dest) |
| { |
| struct i2c_client *i2c = wm831x->control_data; |
| int ret; |
| u16 r = cpu_to_be16(reg); |
| |
| ret = i2c_master_send(i2c, (unsigned char *)&r, 2); |
| if (ret < 0) |
| return ret; |
| if (ret != 2) |
| return -EIO; |
| |
| ret = i2c_master_recv(i2c, dest, bytes); |
| if (ret < 0) |
| return ret; |
| if (ret != bytes) |
| return -EIO; |
| return 0; |
| } |
| |
| /* Currently we allocate the write buffer on the stack; this is OK for |
| * small writes - if we need to do large writes this will need to be |
| * revised. |
| */ |
| static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg, |
| int bytes, void *src) |
| { |
| struct i2c_client *i2c = wm831x->control_data; |
| unsigned char msg[bytes + 2]; |
| int ret; |
| |
| reg = cpu_to_be16(reg); |
| memcpy(&msg[0], ®, 2); |
| memcpy(&msg[2], src, bytes); |
| |
| ret = i2c_master_send(i2c, msg, bytes + 2); |
| if (ret < 0) |
| return ret; |
| if (ret < bytes + 2) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int wm831x_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *id) |
| { |
| struct wm831x *wm831x; |
| |
| wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL); |
| if (wm831x == NULL) { |
| kfree(i2c); |
| return -ENOMEM; |
| } |
| |
| i2c_set_clientdata(i2c, wm831x); |
| wm831x->dev = &i2c->dev; |
| wm831x->control_data = i2c; |
| wm831x->read_dev = wm831x_i2c_read_device; |
| wm831x->write_dev = wm831x_i2c_write_device; |
| |
| return wm831x_device_init(wm831x, id->driver_data, i2c->irq); |
| } |
| |
| static int wm831x_i2c_remove(struct i2c_client *i2c) |
| { |
| struct wm831x *wm831x = i2c_get_clientdata(i2c); |
| |
| wm831x_device_exit(wm831x); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id wm831x_i2c_id[] = { |
| { "wm8310", WM8310 }, |
| { "wm8311", WM8311 }, |
| { "wm8312", WM8312 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id); |
| |
| |
| static struct i2c_driver wm831x_i2c_driver = { |
| .driver = { |
| .name = "wm831x", |
| .owner = THIS_MODULE, |
| }, |
| .probe = wm831x_i2c_probe, |
| .remove = wm831x_i2c_remove, |
| .id_table = wm831x_i2c_id, |
| }; |
| |
| static int __init wm831x_i2c_init(void) |
| { |
| int ret; |
| |
| ret = i2c_add_driver(&wm831x_i2c_driver); |
| if (ret != 0) |
| pr_err("Failed to register wm831x I2C driver: %d\n", ret); |
| |
| return ret; |
| } |
| subsys_initcall(wm831x_i2c_init); |
| |
| static void __exit wm831x_i2c_exit(void) |
| { |
| i2c_del_driver(&wm831x_i2c_driver); |
| } |
| module_exit(wm831x_i2c_exit); |
| |
| MODULE_DESCRIPTION("I2C support for the WM831X AudioPlus PMIC"); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Mark Brown"); |
