1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/hwmon/lis3lv02d_i2c.c
4  *
5  * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
6  * Driver is based on corresponding SPI driver written by Daniel Mack
7  * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
8  *
9  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
10  *
11  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
12  */
13 
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/delay.h>
20 #include <linux/of.h>
21 #include <linux/of_platform.h>
22 #include <linux/of_device.h>
23 
24 #include "lis3lv02d.h"
25 
26 #define DRV_NAME	"lis3lv02d_i2c"
27 
28 static const char reg_vdd[]    = "Vdd";
29 static const char reg_vdd_io[] = "Vdd_IO";
30 
31 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
32 {
33 	int ret;
34 	if (state == LIS3_REG_OFF) {
35 		ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
36 					lis3->regulators);
37 	} else {
38 		ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
39 					lis3->regulators);
40 		/* Chip needs time to wakeup. Not mentioned in datasheet */
41 		usleep_range(10000, 20000);
42 	}
43 	return ret;
44 }
45 
46 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
47 {
48 	struct i2c_client *c = lis3->bus_priv;
49 	return i2c_smbus_write_byte_data(c, reg, value);
50 }
51 
52 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
53 {
54 	struct i2c_client *c = lis3->bus_priv;
55 	*v = i2c_smbus_read_byte_data(c, reg);
56 	return 0;
57 }
58 
59 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
60 				u8 *v)
61 {
62 	struct i2c_client *c = lis3->bus_priv;
63 	reg |= (1 << 7); /* 7th bit enables address auto incrementation */
64 	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
65 }
66 
67 static int lis3_i2c_init(struct lis3lv02d *lis3)
68 {
69 	u8 reg;
70 	int ret;
71 
72 	lis3_reg_ctrl(lis3, LIS3_REG_ON);
73 
74 	lis3->read(lis3, WHO_AM_I, &reg);
75 	if (reg != lis3->whoami)
76 		printk(KERN_ERR "lis3: power on failure\n");
77 
78 	/* power up the device */
79 	ret = lis3->read(lis3, CTRL_REG1, &reg);
80 	if (ret < 0)
81 		return ret;
82 
83 	if (lis3->whoami == WAI_3DLH)
84 		reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
85 	else
86 		reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
87 
88 	return lis3->write(lis3, CTRL_REG1, reg);
89 }
90 
91 /* Default axis mapping but it can be overwritten by platform data */
92 static union axis_conversion lis3lv02d_axis_map =
93 	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
94 
95 #ifdef CONFIG_OF
96 static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
97 	{ .compatible = "st,lis3lv02d" },
98 	{}
99 };
100 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
101 #endif
102 
103 static int lis3lv02d_i2c_probe(struct i2c_client *client)
104 {
105 	int ret = 0;
106 	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
107 
108 #ifdef CONFIG_OF
109 	if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
110 		lis3_dev.of_node = client->dev.of_node;
111 		ret = lis3lv02d_init_dt(&lis3_dev);
112 		if (ret)
113 			return ret;
114 		pdata = lis3_dev.pdata;
115 	}
116 #endif
117 
118 	if (pdata) {
119 		if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
120 			(i2c_check_functionality(client->adapter,
121 						I2C_FUNC_SMBUS_I2C_BLOCK)))
122 			lis3_dev.blkread  = lis3_i2c_blockread;
123 
124 		if (pdata->axis_x)
125 			lis3lv02d_axis_map.x = pdata->axis_x;
126 
127 		if (pdata->axis_y)
128 			lis3lv02d_axis_map.y = pdata->axis_y;
129 
130 		if (pdata->axis_z)
131 			lis3lv02d_axis_map.z = pdata->axis_z;
132 
133 		if (pdata->setup_resources)
134 			ret = pdata->setup_resources();
135 
136 		if (ret)
137 			goto fail;
138 	}
139 
140 	lis3_dev.regulators[0].supply = reg_vdd;
141 	lis3_dev.regulators[1].supply = reg_vdd_io;
142 	ret = regulator_bulk_get(&client->dev,
143 				 ARRAY_SIZE(lis3_dev.regulators),
144 				 lis3_dev.regulators);
145 	if (ret < 0)
146 		goto fail;
147 
148 	lis3_dev.pdata	  = pdata;
149 	lis3_dev.bus_priv = client;
150 	lis3_dev.init	  = lis3_i2c_init;
151 	lis3_dev.read	  = lis3_i2c_read;
152 	lis3_dev.write	  = lis3_i2c_write;
153 	lis3_dev.irq	  = client->irq;
154 	lis3_dev.ac	  = lis3lv02d_axis_map;
155 	lis3_dev.pm_dev	  = &client->dev;
156 
157 	i2c_set_clientdata(client, &lis3_dev);
158 
159 	/* Provide power over the init call */
160 	lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
161 
162 	ret = lis3lv02d_init_device(&lis3_dev);
163 
164 	lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
165 
166 	if (ret)
167 		goto fail2;
168 	return 0;
169 
170 fail2:
171 	regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
172 				lis3_dev.regulators);
173 fail:
174 	if (pdata && pdata->release_resources)
175 		pdata->release_resources();
176 	return ret;
177 }
178 
179 static void lis3lv02d_i2c_remove(struct i2c_client *client)
180 {
181 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
182 	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
183 
184 	if (pdata && pdata->release_resources)
185 		pdata->release_resources();
186 
187 	lis3lv02d_joystick_disable(lis3);
188 	lis3lv02d_remove_fs(&lis3_dev);
189 
190 	regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
191 			    lis3_dev.regulators);
192 }
193 
194 #ifdef CONFIG_PM_SLEEP
195 static int lis3lv02d_i2c_suspend(struct device *dev)
196 {
197 	struct i2c_client *client = to_i2c_client(dev);
198 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
199 
200 	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
201 		lis3lv02d_poweroff(lis3);
202 	return 0;
203 }
204 
205 static int lis3lv02d_i2c_resume(struct device *dev)
206 {
207 	struct i2c_client *client = to_i2c_client(dev);
208 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
209 
210 	/*
211 	 * pm_runtime documentation says that devices should always
212 	 * be powered on at resume. Pm_runtime turns them off after system
213 	 * wide resume is complete.
214 	 */
215 	if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
216 		pm_runtime_suspended(dev))
217 		lis3lv02d_poweron(lis3);
218 
219 	return 0;
220 }
221 #endif /* CONFIG_PM_SLEEP */
222 
223 #ifdef CONFIG_PM
224 static int lis3_i2c_runtime_suspend(struct device *dev)
225 {
226 	struct i2c_client *client = to_i2c_client(dev);
227 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
228 
229 	lis3lv02d_poweroff(lis3);
230 	return 0;
231 }
232 
233 static int lis3_i2c_runtime_resume(struct device *dev)
234 {
235 	struct i2c_client *client = to_i2c_client(dev);
236 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
237 
238 	lis3lv02d_poweron(lis3);
239 	return 0;
240 }
241 #endif /* CONFIG_PM */
242 
243 static const struct i2c_device_id lis3lv02d_id[] = {
244 	{"lis3lv02d", LIS3LV02D},
245 	{"lis331dlh", LIS331DLH},
246 	{}
247 };
248 
249 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
250 
251 static const struct dev_pm_ops lis3_pm_ops = {
252 	SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
253 				lis3lv02d_i2c_resume)
254 	SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
255 			   lis3_i2c_runtime_resume,
256 			   NULL)
257 };
258 
259 static struct i2c_driver lis3lv02d_i2c_driver = {
260 	.driver	 = {
261 		.name   = DRV_NAME,
262 		.pm     = &lis3_pm_ops,
263 		.of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
264 	},
265 	.probe_new = lis3lv02d_i2c_probe,
266 	.remove	= lis3lv02d_i2c_remove,
267 	.id_table = lis3lv02d_id,
268 };
269 
270 module_i2c_driver(lis3lv02d_i2c_driver);
271 
272 MODULE_AUTHOR("Nokia Corporation");
273 MODULE_DESCRIPTION("lis3lv02d I2C interface");
274 MODULE_LICENSE("GPL");
275