/* * 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> 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 - 1 > 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 - 1 > 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: i2c_set_clientdata(i2c, NULL); kfree(wm8400); err: return ret; } static int wm8400_i2c_remove(struct i2c_client *i2c) { struct wm8400 *wm8400 = i2c_get_clientdata(i2c); wm8400_release(wm8400); i2c_set_clientdata(i2c, NULL); 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>");