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/of_device.h> 19 #include <linux/regmap.h> 20 21 #include <linux/mfd/wm831x/core.h> 22 #include <linux/mfd/wm831x/pdata.h> 23 24 static int wm831x_i2c_probe(struct i2c_client *i2c, 25 const struct i2c_device_id *id) 26 { 27 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev); 28 const struct of_device_id *of_id; 29 struct wm831x *wm831x; 30 enum wm831x_parent type; 31 int ret; 32 33 if (i2c->dev.of_node) { 34 of_id = of_match_device(wm831x_of_match, &i2c->dev); 35 if (!of_id) { 36 dev_err(&i2c->dev, "Failed to match device\n"); 37 return -ENODEV; 38 } 39 type = (enum wm831x_parent)of_id->data; 40 } else { 41 type = (enum wm831x_parent)id->driver_data; 42 } 43 44 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL); 45 if (wm831x == NULL) 46 return -ENOMEM; 47 48 i2c_set_clientdata(i2c, wm831x); 49 wm831x->dev = &i2c->dev; 50 wm831x->type = type; 51 52 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config); 53 if (IS_ERR(wm831x->regmap)) { 54 ret = PTR_ERR(wm831x->regmap); 55 dev_err(wm831x->dev, "Failed to allocate register map: %d\n", 56 ret); 57 return ret; 58 } 59 60 if (pdata) 61 memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); 62 63 return wm831x_device_init(wm831x, i2c->irq); 64 } 65 66 static int wm831x_i2c_suspend(struct device *dev) 67 { 68 struct wm831x *wm831x = dev_get_drvdata(dev); 69 70 return wm831x_device_suspend(wm831x); 71 } 72 73 static int wm831x_i2c_poweroff(struct device *dev) 74 { 75 struct wm831x *wm831x = dev_get_drvdata(dev); 76 77 wm831x_device_shutdown(wm831x); 78 79 return 0; 80 } 81 82 static const struct i2c_device_id wm831x_i2c_id[] = { 83 { "wm8310", WM8310 }, 84 { "wm8311", WM8311 }, 85 { "wm8312", WM8312 }, 86 { "wm8320", WM8320 }, 87 { "wm8321", WM8321 }, 88 { "wm8325", WM8325 }, 89 { "wm8326", WM8326 }, 90 { } 91 }; 92 93 static const struct dev_pm_ops wm831x_pm_ops = { 94 .suspend = wm831x_i2c_suspend, 95 .poweroff = wm831x_i2c_poweroff, 96 }; 97 98 static struct i2c_driver wm831x_i2c_driver = { 99 .driver = { 100 .name = "wm831x", 101 .pm = &wm831x_pm_ops, 102 .of_match_table = of_match_ptr(wm831x_of_match), 103 .suppress_bind_attrs = true, 104 }, 105 .probe = wm831x_i2c_probe, 106 .id_table = wm831x_i2c_id, 107 }; 108 109 static int __init wm831x_i2c_init(void) 110 { 111 int ret; 112 113 ret = i2c_add_driver(&wm831x_i2c_driver); 114 if (ret != 0) 115 pr_err("Failed to register wm831x I2C driver: %d\n", ret); 116 117 return ret; 118 } 119 subsys_initcall(wm831x_i2c_init); 120