1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ST Microelectronics MFD: stmpe's i2c client specific driver 4 * 5 * Copyright (C) ST-Ericsson SA 2010 6 * Copyright (C) ST Microelectronics SA 2011 7 * 8 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson 9 * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics 10 */ 11 12 #include <linux/i2c.h> 13 #include <linux/interrupt.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/of_device.h> 18 #include "stmpe.h" 19 20 static int i2c_reg_read(struct stmpe *stmpe, u8 reg) 21 { 22 struct i2c_client *i2c = stmpe->client; 23 24 return i2c_smbus_read_byte_data(i2c, reg); 25 } 26 27 static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val) 28 { 29 struct i2c_client *i2c = stmpe->client; 30 31 return i2c_smbus_write_byte_data(i2c, reg, val); 32 } 33 34 static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) 35 { 36 struct i2c_client *i2c = stmpe->client; 37 38 return i2c_smbus_read_i2c_block_data(i2c, reg, length, values); 39 } 40 41 static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length, 42 const u8 *values) 43 { 44 struct i2c_client *i2c = stmpe->client; 45 46 return i2c_smbus_write_i2c_block_data(i2c, reg, length, values); 47 } 48 49 static struct stmpe_client_info i2c_ci = { 50 .read_byte = i2c_reg_read, 51 .write_byte = i2c_reg_write, 52 .read_block = i2c_block_read, 53 .write_block = i2c_block_write, 54 }; 55 56 static const struct of_device_id stmpe_of_match[] = { 57 { .compatible = "st,stmpe610", .data = (void *)STMPE610, }, 58 { .compatible = "st,stmpe801", .data = (void *)STMPE801, }, 59 { .compatible = "st,stmpe811", .data = (void *)STMPE811, }, 60 { .compatible = "st,stmpe1600", .data = (void *)STMPE1600, }, 61 { .compatible = "st,stmpe1601", .data = (void *)STMPE1601, }, 62 { .compatible = "st,stmpe1801", .data = (void *)STMPE1801, }, 63 { .compatible = "st,stmpe2401", .data = (void *)STMPE2401, }, 64 { .compatible = "st,stmpe2403", .data = (void *)STMPE2403, }, 65 {}, 66 }; 67 MODULE_DEVICE_TABLE(of, stmpe_of_match); 68 69 static int 70 stmpe_i2c_probe(struct i2c_client *i2c) 71 { 72 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 73 enum stmpe_partnum partnum; 74 const struct of_device_id *of_id; 75 76 i2c_ci.data = (void *)id; 77 i2c_ci.irq = i2c->irq; 78 i2c_ci.client = i2c; 79 i2c_ci.dev = &i2c->dev; 80 81 of_id = of_match_device(stmpe_of_match, &i2c->dev); 82 if (!of_id) { 83 /* 84 * This happens when the I2C ID matches the node name 85 * but no real compatible string has been given. 86 */ 87 dev_info(&i2c->dev, "matching on node name, compatible is preferred\n"); 88 partnum = id->driver_data; 89 } else 90 partnum = (enum stmpe_partnum)of_id->data; 91 92 return stmpe_probe(&i2c_ci, partnum); 93 } 94 95 static void stmpe_i2c_remove(struct i2c_client *i2c) 96 { 97 struct stmpe *stmpe = dev_get_drvdata(&i2c->dev); 98 99 stmpe_remove(stmpe); 100 } 101 102 static const struct i2c_device_id stmpe_i2c_id[] = { 103 { "stmpe610", STMPE610 }, 104 { "stmpe801", STMPE801 }, 105 { "stmpe811", STMPE811 }, 106 { "stmpe1600", STMPE1600 }, 107 { "stmpe1601", STMPE1601 }, 108 { "stmpe1801", STMPE1801 }, 109 { "stmpe2401", STMPE2401 }, 110 { "stmpe2403", STMPE2403 }, 111 { } 112 }; 113 MODULE_DEVICE_TABLE(i2c, stmpe_i2c_id); 114 115 static struct i2c_driver stmpe_i2c_driver = { 116 .driver = { 117 .name = "stmpe-i2c", 118 .pm = pm_sleep_ptr(&stmpe_dev_pm_ops), 119 .of_match_table = stmpe_of_match, 120 }, 121 .probe_new = stmpe_i2c_probe, 122 .remove = stmpe_i2c_remove, 123 .id_table = stmpe_i2c_id, 124 }; 125 126 static int __init stmpe_init(void) 127 { 128 return i2c_add_driver(&stmpe_i2c_driver); 129 } 130 subsys_initcall(stmpe_init); 131 132 static void __exit stmpe_exit(void) 133 { 134 i2c_del_driver(&stmpe_i2c_driver); 135 } 136 module_exit(stmpe_exit); 137 138 MODULE_LICENSE("GPL v2"); 139 MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver"); 140 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>"); 141