1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs 4 * 5 * Copyright 2009,2010 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/i2c.h> 13 #include <linux/delay.h> 14 #include <linux/mfd/core.h> 15 #include <linux/slab.h> 16 #include <linux/err.h> 17 #include <linux/of.h> 18 #include <linux/regmap.h> 19 20 #include <linux/mfd/wm831x/core.h> 21 #include <linux/mfd/wm831x/pdata.h> 22 23 static int wm831x_i2c_probe(struct i2c_client *i2c) 24 { 25 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev); 26 struct wm831x *wm831x; 27 enum wm831x_parent type; 28 int ret; 29 30 type = (uintptr_t)i2c_get_match_data(i2c); 31 if (!type) { 32 dev_err(&i2c->dev, "Failed to match device\n"); 33 return -ENODEV; 34 } 35 36 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL); 37 if (wm831x == NULL) 38 return -ENOMEM; 39 40 i2c_set_clientdata(i2c, wm831x); 41 wm831x->dev = &i2c->dev; 42 wm831x->type = type; 43 44 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config); 45 if (IS_ERR(wm831x->regmap)) { 46 ret = PTR_ERR(wm831x->regmap); 47 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 48 ret); 49 return ret; 50 } 51 52 if (pdata) 53 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 54 55 return wm831x_device_init(wm831x, i2c->irq); 56 } 57 58 static int wm831x_i2c_suspend(struct device *dev) 59 { 60 struct wm831x *wm831x = dev_get_drvdata(dev); 61 62 return wm831x_device_suspend(wm831x); 63 } 64 65 static int wm831x_i2c_poweroff(struct device *dev) 66 { 67 struct wm831x *wm831x = dev_get_drvdata(dev); 68 69 wm831x_device_shutdown(wm831x); 70 71 return 0; 72 } 73 74 static const struct i2c_device_id wm831x_i2c_id[] = { 75 { "wm8310", WM8310 }, 76 { "wm8311", WM8311 }, 77 { "wm8312", WM8312 }, 78 { "wm8320", WM8320 }, 79 { "wm8321", WM8321 }, 80 { "wm8325", WM8325 }, 81 { "wm8326", WM8326 }, 82 { } 83 }; 84 85 static const struct dev_pm_ops wm831x_pm_ops = { 86 .suspend = wm831x_i2c_suspend, 87 .poweroff = wm831x_i2c_poweroff, 88 }; 89 90 static struct i2c_driver wm831x_i2c_driver = { 91 .driver = { 92 .name = "wm831x", 93 .pm = &wm831x_pm_ops, 94 .of_match_table = of_match_ptr(wm831x_of_match), 95 .suppress_bind_attrs = true, 96 }, 97 .probe = wm831x_i2c_probe, 98 .id_table = wm831x_i2c_id, 99 }; 100 101 static int __init wm831x_i2c_init(void) 102 { 103 int ret; 104 105 ret = i2c_add_driver(&wm831x_i2c_driver); 106 if (ret != 0) 107 pr_err("Failed to register wm831x I2C driver: %d\n", ret); 108 109 return ret; 110 } 111 subsys_initcall(wm831x_i2c_init); 112