1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers
46 		return -ENODATA;  in mp2888_read_byte_data()
57 	 * , bits 0-2. The value is selected as below:  in mp2888_current_sense_gain_and_resolution_get()
58 	 * 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other  in mp2888_current_sense_gain_and_resolution_get()
67 		data->curr_sense_gain = 85;  in mp2888_current_sense_gain_and_resolution_get()
70 		data->curr_sense_gain = 97;  in mp2888_current_sense_gain_and_resolution_get()
73 		data->curr_sense_gain = 100;  in mp2888_current_sense_gain_and_resolution_get()
76 		data->curr_sense_gain = 50;  in mp2888_current_sense_gain_and_resolution_get()
79 		return -EINVAL;  in mp2888_current_sense_gain_and_resolution_get()
83 	 * Obtain resolution selector for total and phase current report and protection.  in mp2888_current_sense_gain_and_resolution_get()
84 	 * 0: original resolution; 1: half resolution (in such case phase current value should  in mp2888_current_sense_gain_and_resolution_get()
87 	data->total_curr_resolution = (ret & MP2888_TOTAL_CURRENT_RESOLUTION) >> 3;  in mp2888_current_sense_gain_and_resolution_get()
88 	data->phase_curr_resolution = (ret & MP2888_PHASE_CURRENT_RESOLUTION) >> 4;  in mp2888_current_sense_gain_and_resolution_get()
94 mp2888_read_phase(struct i2c_client *client, struct mp2888_data *data, int page, int phase, u8 reg)  in mp2888_read_phase()  argument
98 	ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_phase()
102 	if (!((phase + 1) % 2))  in mp2888_read_phase()
109 	 * - Kcs is the DrMOS current sense gain of power stage, which is obtained from the  in mp2888_read_phase()
110 	 *   register MP2888_MFR_VR_CONFIG1, bits 13-12 with the following selection of DrMOS  in mp2888_read_phase()
111 	 *   (data->curr_sense_gain):  in mp2888_read_phase()
112 	 *   00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A.  in mp2888_read_phase()
113 	 * - Rcs is the internal phase current sense resistor. This parameter depends on hardware  in mp2888_read_phase()
116 	 * If phase current resolution bit is set to 1, READ_CSx value should be doubled.  in mp2888_read_phase()
117 	 * Note, that current phase sensing, providing by the device is not accurate. This is  in mp2888_read_phase()
121 	ret = DIV_ROUND_CLOSEST(ret * 100 - 9800, data->curr_sense_gain);  in mp2888_read_phase()
122 	ret = (data->phase_curr_resolution) ? ret * 2 : ret;  in mp2888_read_phase()
124 	ret = (data->total_curr_resolution) ? ret * 8 : ret * 4;  in mp2888_read_phase()
129 mp2888_read_phases(struct i2c_client *client, struct mp2888_data *data, int page, int phase)  in mp2888_read_phases()  argument
133 	switch (phase) {  in mp2888_read_phases()
135 		ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS1_2);  in mp2888_read_phases()
138 		ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS3_4);  in mp2888_read_phases()
141 		ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS5_6);  in mp2888_read_phases()
144 		ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS7_8);  in mp2888_read_phases()
147 		ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS9_10);  in mp2888_read_phases()
150 		return -ENODATA;  in mp2888_read_phases()
155 static int mp2888_read_word_data(struct i2c_client *client, int page, int phase, int reg)  in mp2888_read_word_data()  argument
163 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
175 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
180 		 * degrees C - scaling is needed to match both.  in mp2888_read_word_data()
185 		if (phase != 0xff)  in mp2888_read_word_data()
186 			return mp2888_read_phases(client, data, page, phase);  in mp2888_read_word_data()
188 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
196 		ret = data->total_curr_resolution ? ret * 2 : ret;  in mp2888_read_word_data()
199 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
208 		ret = data->total_curr_resolution ? ret * 8 : ret * 4;  in mp2888_read_word_data()
212 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
215 		ret = data->total_curr_resolution ? ret * 2 : ret;  in mp2888_read_word_data()
218 		ret = pmbus_read_word_data(client, page, phase, reg);  in mp2888_read_word_data()
226 		ret = data->total_curr_resolution ? ret * 4 : ret * 2;  in mp2888_read_word_data()
230 	 * spec. Skip all of them to avoid exposing non-relevant inputs to sysfs.  in mp2888_read_word_data()
256 		return -ENXIO;  in mp2888_read_word_data()
258 		return -ENODATA;  in mp2888_read_word_data()
277 		word = data->total_curr_resolution ? DIV_ROUND_CLOSEST(word, 8) :  in mp2888_write_word_data()
284 		word = data->total_curr_resolution ? DIV_ROUND_CLOSEST(word, 4) :  in mp2888_write_word_data()
290 		return -ENODATA;  in mp2888_write_word_data()
305 	/* Identify multiphase number - could be from 1 to 10. */  in mp2888_identify_multiphase()
310 	info->phases[0] = ret & GENMASK(3, 0);  in mp2888_identify_multiphase()
313 	 * The device provides a total of 10 PWM pins, and can be configured to different phase  in mp2888_identify_multiphase()
316 	if (info->phases[0] > MP2888_MAX_PHASE)  in mp2888_identify_multiphase()
317 		return -EINVAL;  in mp2888_identify_multiphase()
361 	data = devm_kzalloc(&client->dev, sizeof(struct mp2888_data), GFP_KERNEL);  in mp2888_probe()
363 		return -ENOMEM;  in mp2888_probe()
365 	memcpy(&data->info, &mp2888_info, sizeof(*info));  in mp2888_probe()
366 	info = &data->info;  in mp2888_probe()