| /* |
| * Core driver for WM8400. |
| * |
| * Copyright 2008 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/bug.h> |
| #include <linux/i2c.h> |
| #include <linux/kernel.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/wm8400-private.h> |
| #include <linux/mfd/wm8400-audio.h> |
| #include <linux/slab.h> |
| |
| static struct { |
| u16 readable; /* Mask of readable bits */ |
| u16 writable; /* Mask of writable bits */ |
| u16 vol; /* Mask of volatile bits */ |
| int is_codec; /* Register controlled by codec reset */ |
| u16 default_val; /* Value on reset */ |
| } reg_data[] = { |
| { 0xFFFF, 0xFFFF, 0x0000, 0, 0x6172 }, /* R0 */ |
| { 0x7000, 0x0000, 0x8000, 0, 0x0000 }, /* R1 */ |
| { 0xFF17, 0xFF17, 0x0000, 0, 0x0000 }, /* R2 */ |
| { 0xEBF3, 0xEBF3, 0x0000, 1, 0x6000 }, /* R3 */ |
| { 0x3CF3, 0x3CF3, 0x0000, 1, 0x0000 }, /* R4 */ |
| { 0xF1F8, 0xF1F8, 0x0000, 1, 0x4050 }, /* R5 */ |
| { 0xFC1F, 0xFC1F, 0x0000, 1, 0x4000 }, /* R6 */ |
| { 0xDFDE, 0xDFDE, 0x0000, 1, 0x01C8 }, /* R7 */ |
| { 0xFCFC, 0xFCFC, 0x0000, 1, 0x0000 }, /* R8 */ |
| { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R9 */ |
| { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R10 */ |
| { 0x27F7, 0x27F7, 0x0000, 1, 0x0004 }, /* R11 */ |
| { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R12 */ |
| { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R13 */ |
| { 0x1FEF, 0x1FEF, 0x0000, 1, 0x0000 }, /* R14 */ |
| { 0x0163, 0x0163, 0x0000, 1, 0x0100 }, /* R15 */ |
| { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R16 */ |
| { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R17 */ |
| { 0x1FFF, 0x0FFF, 0x0000, 1, 0x0000 }, /* R18 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1000 }, /* R19 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R20 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R21 */ |
| { 0x0FDD, 0x0FDD, 0x0000, 1, 0x8000 }, /* R22 */ |
| { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0800 }, /* R23 */ |
| { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R24 */ |
| { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R25 */ |
| { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R26 */ |
| { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R27 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R28 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R29 */ |
| { 0x0000, 0x0077, 0x0000, 1, 0x0066 }, /* R30 */ |
| { 0x0000, 0x0033, 0x0000, 1, 0x0022 }, /* R31 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R32 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R33 */ |
| { 0x0000, 0x0003, 0x0000, 1, 0x0003 }, /* R34 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0003 }, /* R35 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R36 */ |
| { 0x0000, 0x003F, 0x0000, 1, 0x0100 }, /* R37 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R38 */ |
| { 0x0000, 0x000F, 0x0000, 0, 0x0000 }, /* R39 */ |
| { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R40 */ |
| { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R41 */ |
| { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R42 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R43 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R44 */ |
| { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R45 */ |
| { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R46 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R47 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R48 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R49 */ |
| { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R50 */ |
| { 0x0000, 0x01B3, 0x0000, 1, 0x0180 }, /* R51 */ |
| { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R52 */ |
| { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R53 */ |
| { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R54 */ |
| { 0x0000, 0x0001, 0x0000, 1, 0x0000 }, /* R55 */ |
| { 0x0000, 0x003F, 0x0000, 1, 0x0000 }, /* R56 */ |
| { 0x0000, 0x004F, 0x0000, 1, 0x0000 }, /* R57 */ |
| { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R58 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R59 */ |
| { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0000 }, /* R60 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 1, 0x0000 }, /* R61 */ |
| { 0x03FF, 0x03FF, 0x0000, 1, 0x0000 }, /* R62 */ |
| { 0x007F, 0x007F, 0x0000, 1, 0x0000 }, /* R63 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R64 */ |
| { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R65 */ |
| { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R66 */ |
| { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R67 */ |
| { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R68 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R69 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R70 */ |
| { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R71 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R72 */ |
| { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R73 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R74 */ |
| { 0x000E, 0x000E, 0x0000, 0, 0x0008 }, /* R75 */ |
| { 0xE00F, 0xE00F, 0x0000, 0, 0x0000 }, /* R76 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R77 */ |
| { 0x03C0, 0x03C0, 0x0000, 0, 0x02C0 }, /* R78 */ |
| { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R79 */ |
| { 0xFFFF, 0xFFFF, 0x0000, 0, 0x0000 }, /* R80 */ |
| { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R81 */ |
| { 0x2BFF, 0x0000, 0xffff, 0, 0x0000 }, /* R82 */ |
| { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R83 */ |
| { 0x80FF, 0x80FF, 0x0000, 0, 0x00ff }, /* R84 */ |
| }; |
| |
| static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest) |
| { |
| int i, ret = 0; |
| |
| BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); |
| |
| /* If there are any volatile reads then read back the entire block */ |
| for (i = reg; i < reg + num_regs; i++) |
| if (reg_data[i].vol) { |
| ret = wm8400->read_dev(wm8400->io_data, reg, |
| num_regs, dest); |
| if (ret != 0) |
| return ret; |
| for (i = 0; i < num_regs; i++) |
| dest[i] = be16_to_cpu(dest[i]); |
| |
| return 0; |
| } |
| |
| /* Otherwise use the cache */ |
| memcpy(dest, &wm8400->reg_cache[reg], num_regs * sizeof(u16)); |
| |
| return 0; |
| } |
| |
| static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs, |
| u16 *src) |
| { |
| int ret, i; |
| |
| BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); |
| |
| for (i = 0; i < num_regs; i++) { |
| BUG_ON(!reg_data[reg + i].writable); |
| wm8400->reg_cache[reg + i] = src[i]; |
| src[i] = cpu_to_be16(src[i]); |
| } |
| |
| /* Do the actual I/O */ |
| ret = wm8400->write_dev(wm8400->io_data, reg, num_regs, src); |
| if (ret != 0) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| /** |
| * wm8400_reg_read - Single register read |
| * |
| * @wm8400: Pointer to wm8400 control structure |
| * @reg: Register to read |
| * |
| * @return Read value |
| */ |
| u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg) |
| { |
| u16 val; |
| |
| mutex_lock(&wm8400->io_lock); |
| |
| wm8400_read(wm8400, reg, 1, &val); |
| |
| mutex_unlock(&wm8400->io_lock); |
| |
| return val; |
| } |
| EXPORT_SYMBOL_GPL(wm8400_reg_read); |
| |
| int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data) |
| { |
| int ret; |
| |
| mutex_lock(&wm8400->io_lock); |
| |
| ret = wm8400_read(wm8400, reg, count, data); |
| |
| mutex_unlock(&wm8400->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm8400_block_read); |
| |
| /** |
| * wm8400_set_bits - Bitmask write |
| * |
| * @wm8400: Pointer to wm8400 control structure |
| * @reg: Register to access |
| * @mask: Mask of bits to change |
| * @val: Value to set for masked bits |
| */ |
| int wm8400_set_bits(struct wm8400 *wm8400, u8 reg, u16 mask, u16 val) |
| { |
| u16 tmp; |
| int ret; |
| |
| mutex_lock(&wm8400->io_lock); |
| |
| ret = wm8400_read(wm8400, reg, 1, &tmp); |
| tmp = (tmp & ~mask) | val; |
| if (ret == 0) |
| ret = wm8400_write(wm8400, reg, 1, &tmp); |
| |
| mutex_unlock(&wm8400->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(wm8400_set_bits); |
| |
| /** |
| * wm8400_reset_codec_reg_cache - Reset cached codec registers to |
| * their default values. |
| */ |
| void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) |
| { |
| int i; |
| |
| mutex_lock(&wm8400->io_lock); |
| |
| /* Reset all codec registers to their initial value */ |
| for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) |
| if (reg_data[i].is_codec) |
| wm8400->reg_cache[i] = reg_data[i].default_val; |
| |
| mutex_unlock(&wm8400->io_lock); |
| } |
| EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); |
| |
| static int wm8400_register_codec(struct wm8400 *wm8400) |
| { |
| struct mfd_cell cell = { |
| .name = "wm8400-codec", |
| .driver_data = wm8400, |
| }; |
| |
| return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0); |
| } |
| |
| /* |
| * wm8400_init - Generic initialisation |
| * |
| * The WM8400 can be configured as either an I2C or SPI device. Probe |
| * functions for each bus set up the accessors then call into this to |
| * set up the device itself. |
| */ |
| static int wm8400_init(struct wm8400 *wm8400, |
| struct wm8400_platform_data *pdata) |
| { |
| u16 reg; |
| int ret, i; |
| |
| mutex_init(&wm8400->io_lock); |
| |
| dev_set_drvdata(wm8400->dev, wm8400); |
| |
| /* Check that this is actually a WM8400 */ |
| ret = wm8400->read_dev(wm8400->io_data, WM8400_RESET_ID, 1, ®); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Chip ID register read failed\n"); |
| return -EIO; |
| } |
| if (be16_to_cpu(reg) != reg_data[WM8400_RESET_ID].default_val) { |
| dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", |
| be16_to_cpu(reg)); |
| return -ENODEV; |
| } |
| |
| /* We don't know what state the hardware is in and since this |
| * is a PMIC we can't reset it safely so initialise the register |
| * cache from the hardware. |
| */ |
| ret = wm8400->read_dev(wm8400->io_data, 0, |
| ARRAY_SIZE(wm8400->reg_cache), |
| wm8400->reg_cache); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Register cache read failed\n"); |
| return -EIO; |
| } |
| for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) |
| wm8400->reg_cache[i] = be16_to_cpu(wm8400->reg_cache[i]); |
| |
| /* If the codec is in reset use hard coded values */ |
| if (!(wm8400->reg_cache[WM8400_POWER_MANAGEMENT_1] & WM8400_CODEC_ENA)) |
| for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) |
| if (reg_data[i].is_codec) |
| wm8400->reg_cache[i] = reg_data[i].default_val; |
| |
| ret = wm8400_read(wm8400, WM8400_ID, 1, ®); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "ID register read failed: %d\n", ret); |
| return ret; |
| } |
| reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; |
| dev_info(wm8400->dev, "WM8400 revision %x\n", reg); |
| |
| ret = wm8400_register_codec(wm8400); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Failed to register codec\n"); |
| goto err_children; |
| } |
| |
| if (pdata && pdata->platform_init) { |
| ret = pdata->platform_init(wm8400->dev); |
| if (ret != 0) { |
| dev_err(wm8400->dev, "Platform init failed: %d\n", |
| ret); |
| goto err_children; |
| } |
| } else |
| dev_warn(wm8400->dev, "No platform initialisation supplied\n"); |
| |
| return 0; |
| |
| err_children: |
| mfd_remove_devices(wm8400->dev); |
| return ret; |
| } |
| |
| static void wm8400_release(struct wm8400 *wm8400) |
| { |
| mfd_remove_devices(wm8400->dev); |
| } |
| |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| static int wm8400_i2c_read(void *io_data, char reg, int count, u16 *dest) |
| { |
| struct i2c_client *i2c = io_data; |
| struct i2c_msg xfer[2]; |
| int ret; |
| |
| /* Write register */ |
| xfer[0].addr = i2c->addr; |
| xfer[0].flags = 0; |
| xfer[0].len = 1; |
| xfer[0].buf = ® |
| |
| /* Read data */ |
| xfer[1].addr = i2c->addr; |
| xfer[1].flags = I2C_M_RD; |
| xfer[1].len = count * sizeof(u16); |
| xfer[1].buf = (u8 *)dest; |
| |
| ret = i2c_transfer(i2c->adapter, xfer, 2); |
| if (ret == 2) |
| ret = 0; |
| else if (ret >= 0) |
| ret = -EIO; |
| |
| return ret; |
| } |
| |
| static int wm8400_i2c_write(void *io_data, char reg, int count, const u16 *src) |
| { |
| struct i2c_client *i2c = io_data; |
| u8 *msg; |
| int ret; |
| |
| /* We add 1 byte for device register - ideally I2C would gather. */ |
| msg = kmalloc((count * sizeof(u16)) + 1, GFP_KERNEL); |
| if (msg == NULL) |
| return -ENOMEM; |
| |
| msg[0] = reg; |
| memcpy(&msg[1], src, count * sizeof(u16)); |
| |
| ret = i2c_master_send(i2c, msg, (count * sizeof(u16)) + 1); |
| |
| if (ret == (count * 2) + 1) |
| ret = 0; |
| else if (ret >= 0) |
| ret = -EIO; |
| |
| kfree(msg); |
| |
| return ret; |
| } |
| |
| static int wm8400_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *id) |
| { |
| struct wm8400 *wm8400; |
| int ret; |
| |
| wm8400 = kzalloc(sizeof(struct wm8400), GFP_KERNEL); |
| if (wm8400 == NULL) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| wm8400->io_data = i2c; |
| wm8400->read_dev = wm8400_i2c_read; |
| wm8400->write_dev = wm8400_i2c_write; |
| wm8400->dev = &i2c->dev; |
| i2c_set_clientdata(i2c, wm8400); |
| |
| ret = wm8400_init(wm8400, i2c->dev.platform_data); |
| if (ret != 0) |
| goto struct_err; |
| |
| return 0; |
| |
| struct_err: |
| kfree(wm8400); |
| err: |
| return ret; |
| } |
| |
| static int wm8400_i2c_remove(struct i2c_client *i2c) |
| { |
| struct wm8400 *wm8400 = i2c_get_clientdata(i2c); |
| |
| wm8400_release(wm8400); |
| kfree(wm8400); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id wm8400_i2c_id[] = { |
| { "wm8400", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id); |
| |
| static struct i2c_driver wm8400_i2c_driver = { |
| .driver = { |
| .name = "WM8400", |
| .owner = THIS_MODULE, |
| }, |
| .probe = wm8400_i2c_probe, |
| .remove = wm8400_i2c_remove, |
| .id_table = wm8400_i2c_id, |
| }; |
| #endif |
| |
| static int __init wm8400_module_init(void) |
| { |
| int ret = -ENODEV; |
| |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| ret = i2c_add_driver(&wm8400_i2c_driver); |
| if (ret != 0) |
| pr_err("Failed to register I2C driver: %d\n", ret); |
| #endif |
| |
| return ret; |
| } |
| subsys_initcall(wm8400_module_init); |
| |
| static void __exit wm8400_module_exit(void) |
| { |
| #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
| i2c_del_driver(&wm8400_i2c_driver); |
| #endif |
| } |
| module_exit(wm8400_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |