1 /* 2 * Implements I2C interface for VTI CMA300_D0x Accelerometer driver 3 * 4 * Copyright (C) 2010 Texas Instruments 5 * Author: Hemanth V <hemanthv@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/module.h> 21 #include <linux/i2c.h> 22 #include <linux/input/cma3000.h> 23 #include "cma3000_d0x.h" 24 25 static int cma3000_i2c_set(struct device *dev, 26 u8 reg, u8 val, char *msg) 27 { 28 struct i2c_client *client = to_i2c_client(dev); 29 int ret; 30 31 ret = i2c_smbus_write_byte_data(client, reg, val); 32 if (ret < 0) 33 dev_err(&client->dev, 34 "%s failed (%s, %d)\n", __func__, msg, ret); 35 return ret; 36 } 37 38 static int cma3000_i2c_read(struct device *dev, u8 reg, char *msg) 39 { 40 struct i2c_client *client = to_i2c_client(dev); 41 int ret; 42 43 ret = i2c_smbus_read_byte_data(client, reg); 44 if (ret < 0) 45 dev_err(&client->dev, 46 "%s failed (%s, %d)\n", __func__, msg, ret); 47 return ret; 48 } 49 50 static const struct cma3000_bus_ops cma3000_i2c_bops = { 51 .bustype = BUS_I2C, 52 #define CMA3000_BUSI2C (0 << 4) 53 .ctrl_mod = CMA3000_BUSI2C, 54 .read = cma3000_i2c_read, 55 .write = cma3000_i2c_set, 56 }; 57 58 static int __devinit cma3000_i2c_probe(struct i2c_client *client, 59 const struct i2c_device_id *id) 60 { 61 struct cma3000_accl_data *data; 62 63 data = cma3000_init(&client->dev, client->irq, &cma3000_i2c_bops); 64 if (IS_ERR(data)) 65 return PTR_ERR(data); 66 67 i2c_set_clientdata(client, data); 68 69 return 0; 70 } 71 72 static int __devexit cma3000_i2c_remove(struct i2c_client *client) 73 { 74 struct cma3000_accl_data *data = i2c_get_clientdata(client); 75 76 cma3000_exit(data); 77 78 return 0; 79 } 80 81 #ifdef CONFIG_PM 82 static int cma3000_i2c_suspend(struct device *dev) 83 { 84 struct i2c_client *client = to_i2c_client(dev); 85 struct cma3000_accl_data *data = i2c_get_clientdata(client); 86 87 cma3000_suspend(data); 88 89 return 0; 90 } 91 92 static int cma3000_i2c_resume(struct device *dev) 93 { 94 struct i2c_client *client = to_i2c_client(dev); 95 struct cma3000_accl_data *data = i2c_get_clientdata(client); 96 97 cma3000_resume(data); 98 99 return 0; 100 } 101 102 static const struct dev_pm_ops cma3000_i2c_pm_ops = { 103 .suspend = cma3000_i2c_suspend, 104 .resume = cma3000_i2c_resume, 105 }; 106 #endif 107 108 static const struct i2c_device_id cma3000_i2c_id[] = { 109 { "cma3000_d01", 0 }, 110 { }, 111 }; 112 113 static struct i2c_driver cma3000_i2c_driver = { 114 .probe = cma3000_i2c_probe, 115 .remove = __devexit_p(cma3000_i2c_remove), 116 .id_table = cma3000_i2c_id, 117 .driver = { 118 .name = "cma3000_i2c_accl", 119 .owner = THIS_MODULE, 120 #ifdef CONFIG_PM 121 .pm = &cma3000_i2c_pm_ops, 122 #endif 123 }, 124 }; 125 126 static int __init cma3000_i2c_init(void) 127 { 128 return i2c_add_driver(&cma3000_i2c_driver); 129 } 130 131 static void __exit cma3000_i2c_exit(void) 132 { 133 i2c_del_driver(&cma3000_i2c_driver); 134 } 135 136 module_init(cma3000_i2c_init); 137 module_exit(cma3000_i2c_exit); 138 139 MODULE_DESCRIPTION("CMA3000-D0x Accelerometer I2C Driver"); 140 MODULE_LICENSE("GPL"); 141 MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>"); 142